Bi-profiled fiber and preparing method thereof

Abstract

A bi-profiled fiber and preparing method thereof are provided. The bi-profiled fiber is manufactured through the steps of spinning melt metering, extruding via the composite spinneret, cooling, oiling, drawing, heat setting and winding, finally containing both double-cross monofilaments and circular monofilaments simultaneously. The bi-profiled fiber is made of the modified polyester, and the modified polyester is dispersed by matte agent and is composed of terephthalic acid segments, ethylene glycol segments and branched diol segments, and the branched diol segment has a structural formula of ##STR00001## where R.sub.1 and R.sub.2 are separately selected from the linear alkylene with 1-3 carbon atoms, R.sub.3 from the alkyl with 1-5 carbon atoms, and R.sub.4 from the alkyl with 2-5 carbon atoms. The matte agents is a mixture of amorphous titanium dioxide and amorphous silicon dioxide, or a mixture of calcium carbonate and amorphous silicon dioxide.

Claims

1. A bi-profiled fiber, comprising a cross monofilament and a circular monofilament, wherein the double-cross monofilament and the circular monofilament are simultaneously extruded from a spinneret, the bi-profiled fiber is made of a modified polyester, and a matte agent is dispersed in the modified polyester; wherein the modified polyester comprises a terephthalic acid segment, an ethylene glycol segment and a branched diol segment, and the branched diol segment has a structural formula of ##STR00014## wherein, each of R.sub.1 and R.sub.2 is selected from a linear alkylene with 1-3 carbon atoms, R.sub.3 is selected from an alkyl with 1-5 carbon atoms, and R.sub.4 is selected from an alkyl with 2-5 carbon atoms; wherein the matte agent is a mixture of amorphous titanium dioxide and amorphous silicon dioxide, or a mixture of calcium carbonate and amorphous silicon dioxide.

2. The bi-profiled fiber of claim 1, wherein the double-cross monofilament has a fineness of 2.5-3.5dtex and the circular monofilament has a fineness of 0.20-0.30 dtex; wherein the double-cross monofilament has a flexural stiffness of 0.82 10.sup.5-1.38 10.sup.5cN.Math.cm.sup.2 and the circular monofilament has a flexural stiffness of 0.0041 10.sup.5-0.027 10.sup.5cN.Math.cm.sup.2; wherein the bi-profiled fiber has a fineness of 150-300 dtex, a breaking strength of greater than or equal to 3.6cn/dtex, a breaking elongation of 40.03.0%, a breaking strength CV of less than or equal to 5.0%, a breaking elongation CV of less than or equal to 10.0%, a boiling water shrinkage of 7.50.5%, and a glossiness of less than 50%.

3. The bi-profiled fiber of claim 2, wherein a content of a cyclic oligomer in the modified polyester is less than or equal to 0.6 wt %; the modified polyester has a number average molecular weight of 20000-27000 and a molecular weight distribution index of 1.8-2.2; a molar content of the branched diol segment in the the modified polyester is 3-5% of a molar content of the terephthalic acid segment; the branched diol segment is 2-ethyl-2-methyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, 2-butyl-2-ethyl-1,3-propanediol, 3,3 -diethyl-1,5 -penpentadiol, 4,4-diethyl-1,7-heptanediol, 4,4-bis(1-methyl ethyl)-1,7-heptanediol, 3,3 -dipropyl-1,5-pentanediol, 4,4-dipropyl-1,7-heptanediol, 4-methyl-4-(1,1-dimethyl ethyl)-1,7-heptanediol, 3 -methyl-3 -amyl-1, 6-hexanediol or 3,3 -dipropyl-1,5 -pentanediol.

4. The bi-profiled fiber of claim 2, wherein an amount of the matte agent is 1.0-1.5 wt % of the modified polyester, and a content of the amorphous silicon dioxide in the matte agent is 13-50 wt %.

5. The bi-profiled fiber of claim 1, wherein a content of a cyclic oligomer in the modified polyester is less than or equal to 0.6wt %; the modified polyester has a number average molecular weight of 20000-27000 and a molecular weight distribution index of 1.8-2.2; a molar content of the branched diol segment in the the modified polyester is 3-5 % of a molar content of the terephthalic acid segment; the branched diol segment is 2-ethyl-2-methyl-1,3-propanediol, 2,2-diethyl-1,3 -propanediol, 2-butyl-2-ethyl-1,3-propanediol, 3,3 -diethyl-1,5-penpentadiol, 4,4-diethyl-1,7-heptanediol, 4,4-bis(1-methyl ethyl)-1,7-heptanediol, 3,3-dipropyl-1,5-pentanediol, 4,4-dipropyl-1,7- heptanediol, 4-methyl-4-(1,1-dimethyl ethyl)-1,7-heptanediol, 3 -methyl-3 -amyl-1,6-hexanediol or 3,3 -dipropyl-1,5-pentanediol.

6. The bi-profiled fiber of claim 5, wherein the modified polyester is prepared by: uniformly mixing a terephthalic acid, an ethylene glycol and a branched diol to obtain a slurry; then performing an esterification reaction and a polycondensation reaction on the slurry to obtain the modified polyester; the esterification reaction comprises: mixing the terephthalic acid, the ethylene glycol and the branched diol to obtain the slurry; adding a catalyst, an extinction agent and a stabilizer into the slurry to obtain a first mixture; carrying out the esterification reaction on the first mixture under a pressure of nitrogen atmosphere to obtain a second mixture, wherein during the esterification reaction, the pressure ranges from an atmospheric pressure to 0.3 MPa, a reaction temperature is 250-260 C., the esterification reaction ends when a water elimination amount in the esterification reaction reaches 90% of a theoretical value; (2) the polycondensation reaction comprises: after the esterification reaction ends, performing the polycondensation reaction on the second mixture at a negative pressure to obtain the modified polyester, wherein the polycondensation reaction comprises a coarse vacuum stage and a fine vacuum stage, wherein during the coarse vacuum stage, a first pressure is smoothly reduced from a normal value to less than 500 Pa within 30-50 min, a first reaction temperature is 275-285 C., while and a first reaction time is 30-50 min, during the fine vacuum stage, a second pressure is furtherly reduced to less than 100 Pa, a second reaction temperature is 260-270 C., while and a second reaction time is 50-90 min.

7. The bi-profiled fiber of claim 6, wherein a molar ration of the terephthalic acid, the ethylene glycol to the branched diol is 1(1.2-2.0)(0.03-0.06), an amount of the catalyst is 0.01-0.05% by weight of the terephthalic acid, an amount of the extinction agent is 0.20-0.25% by weight of the terephthalic acid and an amount of the stabilizer is 0.01-0.05% by weight of the terephthalic acid; the catalyst is of antimony trioxide, antimony glycol or antimony acetate, the extinction agent is titanium dioxide, and the stabilizer is of triphenyl phosphate, trimethyl phosphate or trimethyl phosphite.

8. The bi-profiled fiber of claim 1, wherein an amount of the matte agent is 1.0-1.5 wt % of the modified polyester, and a content of the amorphous silicon dioxide in the matte agent is 13-5 wt %.

9. A method for preparing the bi-profiled fiber of claim 1, comprising performing metering, extruding via the spinneret, cooling, oiling, drawing, heat setting and winding on a spinning melt to obtain the bi-profiled fiber; wherein the spinning melt comprises the modified polyester and the matte agent; the spinneret is simultaneously provided with a plurality of double-cross shaped orifices and a plurality of circular orifices; a ratio of a length of each double-cross orifice of the plurality of double-cross orifices to a length of each circular orifice of the plurality of circular orifices is equal to a product of a ratio of an equivalent diameter of the each double-cross orifice to an equivalent diameter of the each circular orifice and a coefficient K, the equivalent diameter of the each double- cross orifice is a ratio of a cross-sectional area to a cross-sectional circumference of the each double-cross orifice, the equivalent diameter of the each circular orifice is a ratio of a cross-sectional area to a cross-sectional circumference of the each circular orifice, and the coefficient K ranges from 0.97 to 1.03; an oiling agent in the oiling contains 67.30-85.58 wt % of crown ether.

10. The method for preparing the bi-profiled fiber of claim 9, wherein the length of the each double-cross orifice or the length of the each circular orifice is 0.24-2.08 mm, the equivalent diameter of the each double-cross orifice or the equivalent diameter of the each circular orifice is 0.12-0.52 mm; the plurality of circular orifices and the plurality of double-cross orifices are arranged on the spinneret; centers of the plurality of circular orifices or circumferential centers of the plurality of double-cross orifices are arranged in regular intervals on a plurality of equally spaced concentric circles; a plurality of orifices of the plurality of double- cross orifices and the plurality of circular orifices are arranged on a same circle; the plurality of orifices on the same circle comprises double-cross orifices and circular orifices, and a quantity ratio of the double-cross orifices to the circular orifices is 1:10-30.

11. The method for preparing the bi-profiled fiber of claim 10, a plurality of spinning process parameters of the bi-profiled fiber are as follows: spinning temperature 280-290 C.; cooling temperature 20-25 C.; interlacing pressure 0.20-0.30 MPa; speed of a first godet roller 2200-2600 m/min; temperature of the first godet roller 75-85 C.; speed of a second godet roller 3600-3900 m/min; temperature of the second godet roller 135-165 C.; winding speed 3580-3840 m/min; and an initial pressure of a spinning pack is 120 bar and a pressure rising AP is equal to or less than 0.6 bar/day.

12. The method for preparing the bi-profiled fiber of claim 9, wherein a weight loss of the oiling agent is less than 15% after a heat treatment at 200 C. for 2 hours; wherein the oiling agent has a kinetic viscosity of 27.5-30.1 mm.sup.2/s at 500.01 C., and the kinetic viscosity becomes 0.93-0.95 mm.sup.2/s when the oiling agent is dispersed with a content of 10 wt % in water to form an emulsion; wherein the oiling agent has an oil film strength of 121-127 N; wherein the oiling agent has a surface tension of 23.2-26.8 cN/cm and a specific resistance of 1.0 10.sup.8-1.8 10.sup.8.Math.cm; after the oiling, a static friction coefficient between the bi-profiled fibers is 0.250-0.263, and a dynamic friction coefficient between the bi-profiled fibers is 0.262-0.273; after the oiling, a static friction coefficient between the bi-profiled fiber and a metal is 0.202-0.210, and a dynamic friction coefficient between the bi-profiled fiber and the metal is 0.320-0.332; the crown ether is 2 hydroxymethyl-12-crown ether-4, 15-crown ether-5 or 2-hydroxymethyl-15-crown ether-5; the oiling agent further contains a mineral oil, a potassium phosphate, trimethylolpropane laurate and sodium alkyl sulfonate; the mineral oil is one selected from the group consisting of 9 #-17 # mineral oil; the potassium phosphate is a potassium salt of dodecyl phosphate, iso-tridecanol polyoxyethylene ether phosphate or dodeca-tetradecanol phosphate; the sodium alkyl sulfonate is a sodium salt of dodecyl sulfonate, pentadecyl sulfonate or hexadecyl sulfonate; the oiling agent before used is dispersed with a content of 10-20 wt % in water to form the emulsion; and a method for preparing the oiling agent comprises: mixing the crown ether, the potassium phosphate, the trimethylolpropane laurate and the sodium alkyl sulfonate to obtain a mixture, and then adding the mixture into the mineral oil to obtain the oiling agent; an amount of each of the mineral oil, the potassium phosphate, the trimethylolpropane laurate, the crown ether, and the sodium alkyl sulfonate by weight is as follows: TABLE-US-00004 mineral oil 0-10 phr, trimethylolpropane laurate 0-20 phr, crown ether 70-100 phr, potassium phosphate 8-15 phr, sodium alkyl sulfonate 2-7 phr, the mixing is carried out by performing a stirring at 40-55 C. for 1-3 hours.

13. The method for preparing the bi-profiled fiber of claim 12, a plurality of spinning process parameters of the bi-profiled fiber are as follows: spinning temperature 280-290 C.; cooling temperature 20-25 C.; interlacing pressure 0.20-0.30 MPa; speed of a first godet roller 2200-2600 m/min; temperature of the first godet roller 75-85 C.; speed of a second godet roller 3600-3900 m/min; temperature of the second godet roller 135-165 C.; winding speed 3580-3840 m/min; and an initial pressure of a spinning pack is 120 bar and a pressure rising AP is equal to or less than 0.6 bar/day.

14. The method for preparing the bi-profiled fiber of claim 9, a plurality of spinning process parameters of the bi-profiled fiber are as follows: spinning temperature 280-290 C.; cooling temperature 20-25 C.; interlacing pressure 0.20-0.30 MPa; speed of a first godet roller 2200-2600 m/min; temperature of the first godet roller 75-85 C.; speed of a second godet roller 3600-3900 m/min; temperature of the second godet roller135-165 C.; winding speed 3580-3840 m/min; and an initial pressure of a spinning pack is 120 bar and a pressure rising AP is equal to or less than 0.6 bar/day.

15. The method for preparing the bi-profiled fiber of claim 9, wherein the double-cross monofilament has a fineness of 2.5-3.5 dtex and the circular monofilament has a fineness of 0.20-0.30 dtex; wherein the double-cross monofilament has a flexural stiffness of 0.82 10.sup.5-1.38 10.sup.5cN.Math.cm.sup.2 and the circular monofilament has a flexural stiffness of 0.0041 10.sup.5-0.027 10.sup.5cN.Math.cm.sup.2; wherein the bi-profiled fiber has a fineness of 150-300dtex, a breaking strength of greater than or equal to 3.6 cn/dtex, a breaking elongation of 40.03.0%, a breaking strength CV of less than or equal to 5.0%, a breaking elongation CV of less than or equal to 10.0%, a boiling water shrinkage of 7.50.5%, and a glossiness of less than 50%.

16. The method for preparing the bi-profiled fiber of claim 9, wherein a content of a cyclic oligomer in the modified polyester is less than or equal to 0.6 wt %; the modified polyester has a number average molecular weight of 20000-27000 and a molecular weight distribution index of 1.8-2.2; a molar content of the branched diol segment in the the modified polyester is 3-5% of a molar content of the terephthalic acid segment; the branched diol segment is 2-ethyl-2-methyl-1,3-propanediol, 2,2-diethyl-1,3-propanediol, 2-butyl-2-ethyl-1,3-propanediol, 3,3 -diethyl-1,5-penpentadiol, 4,4-diethyl-1,7-heptanediol, 4,4-bis(1-methyl ethyl)-1,7-heptanediol, 3,3 -dipropyl-1,5-pentanediol, 4,4-dipropyl-1,7-heptanediol, 4-methyl-4-(1,1-dimethyl ethyl)-1,7-heptanediol, 3 -methyl-3 -amyl-1, 6-hexanediol or 3,3 -dipropyl-1,5-pentanediol.

17. The method for preparing the bi-profiled fiber of claim 16, wherein the modified polyester is prepared by: uniformly mixing a terephthalic acid, an ethylene glycol and a branched diol to obtain a slurry; then performing an esterification reaction and a polycondensation reaction on the slurry to obtain the modified polyester; (1) the esterification reaction comprises: mixing the terephthalic acid, the ethylene glycol and the branched diol to obtain the slurry; adding a catalyst, an extinction agent and a stabilizer into the slurry to obtain a first mixture; carrying out the esterification reaction on the first mixture under a pressure of nitrogen atmosphere to obtain a second mixture, wherein during the esterification reaction, the pressure ranges from an atmospheric pressure to 0.3 MPa, a reaction temperature is 250-260 C., and the esterification reaction ends when a water elimination amount in the esterification reaction reaches 90% of a theoretical value; (2) the polycondensation reaction comprises: after the esterification reaction ends, performing the polycondensation reaction on the second mixture at a negative pressure to obtain the modified polyester, wherein the polycondensation reaction comprises a coarse vacuum stage and a fine vacuum stage, wherein during the coarse vacuum stage, a first pressure is smoothly reduced from a normal value to less than 500Pa within 30-50 min, a first reaction temperature is 275-285 C., and a first reaction time is 30-50min, during the fine vacuum stage, a second pressure is furtherly reduced to less than 100Pa, a second reaction temperature is 260-270 C., and a second reaction time is 50-90 min.

18. The method for preparing the bi-profiled fiber of claim 17, wherein a molar ration of the terephthalic acid, the ethylene glycol to the branched diol is 1:(1.2-2.0): (0.03-0.06), an amount of the catalyst is 0.01-0.05% by weight of the terephthalic acid, an amount of the extinction agent is 0.20-0.25% by weight of the terephthalic acid and an amount of the stabilizer s 0.01-0.05% by weight of the terephthalic acid; the catalyst is antimony trioxide, antimony glycol or antimony acetate, the extinction agent is titanium dioxide, and the stabilizer is triphenyl phosphate, trimethyl phosphate or trimethyl phosphite.

19. The method for preparing the bi-profiled fiber of claim 9, wherein an amount of the matte agent is 1.0-1.5 wt % of the modified polyester, and a content of the amorphous silicon dioxide in the matte agent is 13-50 wt %.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

(1) Based on above mentioned method, the following embodiments are carried out for further demonstration in the present invention. It is to be understood that these embodiments are only intended to illustrate the invention and are not intended to limit the scope of the invention. In addition, it should be understood that after reading the contents described in the present invention, those technical personnel in this field can make various changes or modifications to the invention, and these equivalent forms also fall within the scope of the claims attached to the application.

(2) In general, the procedure of the preparing method for bi-profiled fiber includes:

(3) (1) Preparation of spinning melt

(4) (1.1) Preparation of modified polyester

(5) (a) Esterification

(6) Firstly, a slurry of terephthalic acid, ethylene glycol and the branched diol with a molar ratio A is concocted and properly mixed with the catalyst, the extinction agent and the stabilizer, then the esterification is carried out in the nitrogen atmosphere under the pressure of B and the temperature of C. The end point of esterification is chosen as the moment when the elimination of water reach D of the theoretical value. The additive contents (mass percentages relative to terephthalic acid) of the catalyst, the extinction agent and the stabilizer are E, F and G, respectively.

(7) (b) Polycondensation

(8) After the esterification hereinabove, the polycondensation is performed at negative pressure to obtain modified polyester eventually, which includes two successive stages, i.e., a) coarse vacuum stage, wherein the absolute pressure is smoothly reduced from the normal value to I within a time of H, and the reaction temperature is J while reaction time is k, b) fine vacuum stage, wherein the pressure is furtherly reduced to L, and the reaction temperature is M while reaction time is N. The obtained modified polyester possesses a molecular chain structure composed of terephthalic acid segments, ethylene glycol segments and the branched diol segments (whose molar content is R respect to that of terephthalic acid segments), a cyclic oligomer content of O, a number average molecular weight of P and a molecular weight distribution index of Q.

(9) (1.2) The modified polyester is dispersed by the extinction agent, i.e., the mixture of amorphous titanium dioxide and amorphous silica. The additive content of the extinction agent in polyester is S, and in the extinction mixture the content of amorphous silica is T.
(2) Concoction of oiling agent

(10) Crown ether, potassium phosphate, trimethylolpropane laurate and sodium alkyl sulfonate are fully blended under room temperature and then added into the mineral oil, and stirred furtherly under a temperature of t1 for a time of t2 to produce the oiling agent. Counted by weight parts, the oiling agent consists of a1 phr of mineral oil, a2 phr of trimethylolpropane laurate, a3 phr of crown ether, a4 phr of potassium phosphate and a5 phr of sodium alkyl sulfonate. The obtained oiling agent has a crown ether content of b, a high temperature resistance (b2 wt % of weight loss, after 2 hr of heating at 200 C.), a low viscosity (b3 of kinetic viscosity at 500.01 C., or b4 when dispersed with a content of 10 wt % in water to form an emulsion), a high oil strength of c1, a surface tension of c2 and a specific resistance of c3. After oiling the static friction coefficient and dynamic friction coefficient between fibers are .sub.s and .sub.d, while the static friction coefficient and dynamic friction coefficient between fibers and metals are .sub.s1 and .sub.d1, respectively.

(11) (3) The bi-profiled polyester fibers are prepared from the spinning melt mentioned above through the steps of melt metering, extruding via the composite spinneret, cooling, oiling, drawing, heat setting and winding, and the spinning parameters in those technology steps are respectively set up as:

(12) TABLE-US-00003 Spinning temperature T1, Cooling temperature T2, Interlacing pressure P1, Speed of godet roller 1 V1, Temperature of godet roller1 T1, Speed of godet roller 2 V2, Temperature of godet roller 2 T2, Winding speed V3, Initial pressure of spinning pack P0, Pressure rising of spinning pack P.

(13) Herein said composition spinneret is simultaneously provided with double-cross shaped orifices and circular orifices, and the length ratio of double-cross orifice to circular orifice is equal to the product of their equivalent diameter ratio and a coefficient K, here equivalent diameter is the ratio of orifice cross-section area to its circumference and K value is U. The length of double-cross spinneret orifices is W1, while the length and equivalent diameter of circular spinneret orifices are W2 and W3, respectively. All the spinneret orifices, specifically, all the center of circular orifices or all the circumferential center of double-cross orifices are arranged in regular intervals along the equally spaced concentric circles on the spinneret, and in the same ring both double-cross orifices and circular orifices are set up with a number ratio of X.

(14) The final obtained fiber is a bi-profiled one composed of both double-cross monofilaments and circular monofilaments extruded from the same spinneret, and the double-cross monofilaments have a fineness of D1 and a flexural stiffness of Y1, whereas those of the circular monofilaments are D2 and Y2, respectively.

(15) The bi-profiled fiber has a fineness of D3, a breaking strength of Z1, a breaking elongation of Z2, a breaking strength CV of Z3, a breaking elongation CV of Z4, a boiling water shrinkage of Z5 and a glossiness of Z6.

(16) The synthesizing method of branched diol is demonstrated as follows. At first A1, A2 and triethylamine are reacted for 20 min under TO C. in nitrogen atmosphere, then the concentrated solution is added into the hydrogenation reactor equipped with Raney nickel catalyst, and the reaction is furtherly carried out under 2.914 MPa of hydrogen pressure at 100 C. When the reaction is completed, the reaction system is cooled to separate the catalyst out, then the solution is treated with ion exchange resin, followed by the water vacuum distillation, the separation and the purification of branched diol.

Example 1

(17) Specifically, a method for preparing the bi-profiled fiber, comprising the steps:

(18) (1) Preparation of spinning melt, wherein A is 1:1.2:0.03, the catalyst is antimony trioxide, the extinction agent is titanium dioxide, the stabilizer is triphenyl phosphate, B is atmospheric pressure, C is 250 C., D is 90%, E is 0.01%, F is 0.20%, G is 0.05%, H is 30 min, I is 500 Pa, J is 260 C., k is 40 min, L is 100 Pa, M is 275 C., N is 70 min, O is 0.6 wt %, P is 20000, Q is 2.0, R is 3%, S is 1.0 wt %, T is 13 wt %, and the branched diol is 2-ethyl-2-methyl-1,3-propanediol with a formula of

(19) ##STR00003##

(20) (2) Concoction of oiling agent, wherein the crown ether is 2-hydroxymethyl-12-crown ether-4, the potassium phosphate is potassium dodecyl phosphate, the sodium alkyl sulfonate is sodium dodecyl sulfonate, the grade of mineral oil is 9#, t1 is 40 C., t2 is 1 h, a1 is 2, a2 is 10, a3 is 90, a4 is 8, a5 is 3, b is 79.6 wt %, b2 is 14.5 wt %, b3 is 29.6 mm.sup.2/s, b4 is 0.93 mm.sup.2/s, c1 is 125N, c2 is 24.8 cN/cm, c3 is 1.310.sup.8 .Math.cm, .sub.s is 0.255, .sub.d is 0.266, .sub.s1 is 0.203, .sub.d1 is 0.320, and d is 15 wt %;

(21) (3) Manufacture of the bi-profiled fiber through the processes of melt metering, extruding via the composite spinneret, cooling, oiling, drawing, heat setting and winding, where Ti is 284 C., T2 is 22 C., P1 is 0.20 MPa, V1 is 2500 m/min, T2 is 75 C., V2 is 3600 m/min, T3 is 135 C., V3 is 3650 m/min, P0 is 120 bar, P is 0.5 bar/day, U is 0.97, W1 is 0.55 mm, W2 is 0.54 mm, W3 is 0.33 mm, and X is 1:10;

(22) For the finally obtained bi-profiled fiber, D1 is 2.8 dtex, Y1 is 0.8810.sup.5 cN.Math.cm.sup.2, D2 is 0.30 dtex, Y2 is 0.005810.sup.5 cN.Math.cm.sup.2, D3 is 200 dtex, Z1 is 4.5 cN/dtex, Z2 is 40.0%, Z3 is 5.0%, Z4 is 9.0%, Z5 is 7.5%, and Z6 is 44% o

Example 2

(23) Specifically, a method for preparing the bi-profiled fiber, comprising the steps:

(24) (1) Preparation of spinning melt, wherein A is 1:1.3:0.04, the branched diol is 2,2-diethyl-1,3-propanediol, the catalyst is antimony glycolate, the extinction agent is titanium dioxide, the stabilizer is trimethyl phosphate, B is atmospheric pressure, C is 260 C., D is 91%, E is 0.02%, F is 0.21%, G is 0.03%, H is 35 min, I is 490 Pa, J is 261 C., k is 30 min, L is 100 Pa, M is 277 C., N is 85 min, O is 0.6 wt %, P is 27000, Q is 1.8, R is 5%, S is 1.2 wt %, T is 22 wt %, and the formula of 2,2-diethyl-1,3-propanediol is

(25) ##STR00004##

(26) (2) Concoction of oiling agent, wherein the crown ether is 15-crown ether-5, the potassium phosphate is potassium iso-tridecanol polyoxyethylene ether phosphate, the sodium alkyl sulfonate is sodium pentadecyl sulfonate, the grade of mineral oil is 10#, t1 is 43 C., t2 is 1.5 h, a1 is 2, a2 is 15, a3 is 70, a4 is 10, a5 is 7, b is 67.3 wt %, b2 is 13 wt %, b3 is 28.1 mm.sup.2/s, b4 is 0.93 mm.sup.2/s, c1 is 123N, c2 is 25.1 cN/cm, c3 is 1.510.sup.8 .Math.cm, .sub.s is 0.257, .sub.d is 0.265, .sub.s1 is 0.205, .sub.d1 is 0.323, and d is 14 wt %;

(27) (3) Manufacture of the bi-profiled fiber through the processes of melt metering, extruding via the composite spinneret, cooling, oiling, drawing, heat setting and winding, where Ti is 280 C., T2 is 23 C., P1 is 0.25 MPa, V1 is 2500 m/min, T2 is 80 C., V2 is 3800 m/min, T3 is 140 C., V3 is 3780 m/min, P0 is 120 bar, P is 0.45 bar/day, U is 0.97, W1 is 1.25 mm, W2 is 1.24 mm, W3 is 0.48 mm, and X is 1:20;

(28) For the finally obtained bi-profiled fiber, D1 is 3.2 dtex, Y1 is 0.9510.sup.5 cN.Math.cm.sup.2, D2 is 0.25 dtex, Y2 is 0.004910.sup.5 cN.Math.cm.sup.2, D3 is 280 dtex, Z1 is 4.0 cN/dtex, Z2 is 43.0%, Z3 is 5.0%, Z4 is 9.2%, Z5 is 7.0%, and Z6 is 48% o

Example 3

(29) Specifically, a method for preparing the bi-profiled fiber, comprising the steps:

(30) (1) Preparation of spinning melt, wherein A is 1:1.4:0.05, the branched diol is 2-butyl-2-ethyl-1,3-propanediol, the catalyst is antimony acetate, the extinction agent is titanium dioxide, the stabilizer is trimethyl phosphite, B is 0.1 MPa, C is 252 C., D is 92%, E is 0.03%, F is 0.23%, G is 0.01%, H is 40 min, I is 495 Pa, J is 263 C., k is 45 min, L is 95 Pa, M is 278 C., N is 60 min, O is 0.5 wt %, P is 21000, Q is 2.2, R is 4%, S is 1.3 wt %, T is 34 wt %, and the formula of 2-butyl-2-ethyl-1,3-propanediol is

(31) ##STR00005##

(32) (2) Concoction of oiling agent, wherein the crown ether is 2-hydroxymethyl-15-crown ether-5, the potassium phosphate is potassium potassium dodeca-tetradecanol phosphate, the sodium alkyl sulfonate is sodium pentadecyl sulfonate, the grade of mineral oil is 11#, t1 is 48 C., t2 is 3 h, a1 is 8, a2 is 10, a3 is 85, a4 is 11, a5 is 5, b is 70.83 wt %, b2 is 11 wt %, b3 is 30.1 mm.sup.2/s, b4 is 0.94 mm.sup.2/s, c1 is 125N, c2 is 23.2 cN/cm, c3 is 1.810.sup.8 .Math.cm, .sub.s is 0.250, .sub.d is 0.272, .sub.s1 is 0.209, .sub.d1 is 0.329, and d is 10 wt %;

(33) (3) Manufacture of the bi-profiled fiber through the processes of melt metering, extruding via the composite spinneret, cooling, oiling, drawing, heat setting and winding, where Ti is 285 C., T2 is 20 C., P1 is 0.26 MPa, V1 is 2200 m/min, T2 is 75 C., V2 is 3700 m/min, T3 is 150 C., V3 is 3700 m/min, P0 is 120 bar, P is 0.56 bar/day, U is 0.97, W1 is 1.68 mm, W2 is 1.68 mm, W3 is 0.17 mm, and X is 1:15;

(34) For the finally obtained bi-profiled fiber, D1 is 2.9 dtex, Y1 is 0.8210.sup.5 cN.Math.cm.sup.2, D2 is 0.24 dtex, Y2 is 0.004110.sup.5 cN.Math.cm.sup.2, D3 is 190 dtex, Z1 is 3.9 cN/dtex, Z2 is 43.0%, Z3 is 4.5%, Z4 is 9.5%, Z5 is 8.0%, and Z6 is 45%.

Example 4

(35) Specifically, a method for preparing the bi-profiled fiber, comprising the steps:

(36) (1) Preparation of spinning melt, wherein TO is 90 C., A1 is 3,3-diethyl-propionaldehyde, A2 is acetaldehyde, A is 1:1.5:0.06, the branched diol is 3,3-diethyl-1,5-penpentadiol, the catalyst is antimony trioxide, the extinction agent is titanium dioxide, the stabilizer is triphenyl phosphate, B is 0.3 MPa, C is 255 C., D is 95%, E is 0.04%, F is 0.25%, G is 0.01%, H is 50 min, I is 400 Pa, J is 265 C., k is 33 min, L is 90 Pa, M is 280 C., N is 50 min, O is 0.2 wt %, P is 23000, Q is 1.9, R is 3.5%, S is 1.15 wt % o, T is 15 wt %, and the branched diol is 3,3-diethyl-1,5-penpentadiol with a formula of

(37) ##STR00006##

(38) (2) Concoction of oiling agent, wherein the crown ether is 2-hydroxymethyl-12-crown ether-4, the potassium phosphate is potassium dodecyl phosphate, the sodium alkyl sulfonate is sodium hexadecyl sulfonate, the grade of mineral oil is 12#, t1 is 40 C., t2 is 2.5 h, a1 is 5, a3 is 95, a4 is 9, a5 is 2, b is 85.58 wt %, b2 is 9 wt %, b3 is 29.5 mm.sup.2/s, b4 is 0.93 mm.sup.2/s, c1 is 121N, c2 is 24.3 cN/cm, c3 is 1.010.sup.8 .Math.cm, .sub.s is 0.202, .sub.d is 0.263, .sub.s1 is 0.202, .sub.d1 is 0.330, and d is 19 wt %;

(39) (3) Manufacture of the bi-profiled fiber through the processes of melt metering, extruding via the composite spinneret, cooling, oiling, drawing, heat setting and winding, where Ti is 283 C., T2 is 20 C., P1 is 0.28 MPa, V1 is 2400 m/min, T2 is 78 C., V2 is 3600 m/min, T3 is 145 C., V3 is 3580 m/min, P0 is 120 bar, P is 0.6 bar/day, U is 0.97, W1 is 0.24 mm, W2 is 0.24 mm, W3 is 0.12 mm, and X is 1:15;

(40) For the finally obtained bi-profiled fiber, D1 is 2.5 dtex, Y1 is 1.0510.sup.5 cN.Math.cm.sup.2, D2 is 0.20 dtex, Y2 is 0.02710.sup.5 cN.Math.cm.sup.2, D3 is 150 dtex, Z1 is 3.6 cN/dtex, Z2 is 37.0%, Z3 is 4.0%, Z4 is 10.0%, Z5 is 8.0%, and Z6 is 43% o

Example 5

(41) Specifically, a method for preparing the bi-profiled fiber, comprising the steps:

(42) (1) Preparation of spinning melt, wherein TO is 91 C., A1 is 4,4-diethyl-butyraldehyde, A2 is propanal, A is 1:1.6:0.03, the catalyst is antimony glycolate, the extinction agent is titanium dioxide, the stabilizer is trimethyl phosphate, B is atmospheric pressure, C is 257 C., D is 92%, E is 0.05%, F is 0.20%, G is 0.04%, H is 33 min, I is 450 Pa, J is 270 C., k is 30 min, L is 95 Pa, M is 275 C., N is 60 min, O is 0.5 wt %, P is 25000, Q is 2.1, R is 5%, S is 1.2 wt %, T is 40 wt %, and the branched diol is 4,4-diethyl-1,7-heptanediol with a formula of

(43) ##STR00007##

(44) (2) Concoction of oiling agent, wherein the crown ether is 15-the crown ether-5, the potassium phosphate is potassium iso-tridecanol polyoxyethylene ether phosphate, the sodium alkyl sulfonate is sodium dodecyl sulfonate, the grade of mineral oil is 13#, t1 is 52 C., t2 is 2 h, a1 is 10, a2 is 5, a3 is 70, a4 is 8, a5 is 6, b is 70.70 wt %, b2 is 13.5 wt %, b3 is 28.6 mm.sup.2/s, b4 is 0.95 mm.sup.2/s, c1 is 126N, c2 is 24.9 cN/cm, c3 is 1.210.sup.8 .Math.cm, .sub.s is 0.251, .sub.d is 0.262, .sub.s1 is 0.202, .sub.d1 is 0.332, and d is 11 wt %;

(45) (3) Manufacture of the bi-profiled fiber through the processes of melt metering, extruding via the composite spinneret, cooling, oiling, drawing, heat setting and winding, wherein Ti is 287 C., T2 is 24 C., P1 is 0.30 MPa, V1 is 2200 m/min, T2 is 79 C., V2 is 3800 m/min, T3 is 155 C., V3 is 3660 m/min, P0 is 120 bar, P is 0.55 bar/day, U is 0.97, W1 is 0.38 mm, W2 is 0.38 mm, W3 is 0.45 mm, and X is 1:20.

(46) For the finally obtained bi-profiled fiber, D1 is 3.3 dtex, Y1 is 1.2210.sup.5 cN.Math.cm.sup.2, D2 is 0.30 dtex, Y2 is 0.015410.sup.5 cN.Math.cm.sup.2. D3 is 150 dtex, Z1 is 4.8 cN/dtex, Z2 is 37.0%, Z3 is 4.8%, Z4 is 9.5%, Z5 is 7.5%, and Z6 is 46%.

Example 6

(47) Specifically, a method for preparing the bi-profiled fiber, comprising the steps:

(48) (1) Preparation of spinning melt, wherein TO is 92 C., A1 is 4,4-bis(1-methy ethyl)-butyraldehyde, A2 is propanal, A is 1:1.7:0.05, the catalyst is antimony acetate, the extinction agent is titanium dioxide, the stabilizer is trimethyl phosphite, B is 0.2 MPa, C is 253 C., D is 96%, E is 0.01%, F is 0.20%, G is 0.05%, H is 38 min, I is 480 Pa, J is 262 C., k is 38 min, L is 98 Pa, M is 279 C., N is 80 min, O is 0.55 wt %, P is 27000, Q is 2.2, R is 4%, S is 1.5 wt %, T is 38 wt %, and the branched diol is 4,4-bis(1-methyl ethyl)-1,7-heptanediol with a formula of

(49) ##STR00008##

(50) (2) Concoction of oiling agent, wherein the crown ether is 2-hydroxymethyl-15-crown ether-5, the potassium phosphate is potassium dodeca-tetradecanol phosphate, the sodium alkyl sulfonate is sodium pentadecyl sulfonate, the grade of mineral oil is 14#, t1 is 55 C., t2 is 1 h, a1 is 3, a2 is 5, a3 is 75, a4 is 14, a5 is 7, b is 68.8 wt %, b2 is 12 wt %, b3 is 27.5 mm.sup.2/s, b4 is 0.95 mm.sup.2/s, c1 is 126N, c2 is 25.4 cN/cm, c3 is 1.610.sup.8 .Math.cm, .sub.s is 0.255, .sub.d is 0.267, .sub.s1 is 0.203, .sub.d1 is 0.330, and d is 20 wt %;

(51) (3) Manufacture of the bi-profiled fiber through the processes of melt metering, extruding via the composite spinneret, cooling, oiling, drawing, heat setting and winding, wherein Ti is 290 C., T2 is 25 C., P1 is 0.27 MPa, V1 is 2500 m/min, T2 is 80 C., V2 is 3900 m/min, T3 is 150 C., V3 is 3790 m/min, P0 is 120 bar, P is 0.42 bar/day, U is 0.97, W1 is 0.95 mm, W2 is 0.95 mm, W3 is 0.52 mm, and X is 1:25.

(52) For the finally obtained bi-profiled fiber, D1 is 2.5 dtex, Y1 is 0.9710.sup.5 cN.Math.cm.sup.2, D2 is 0.25 dtex, Y2 is 0.002110.sup.5 cN.Math.cm.sup.2. D3 is 300 dtex, Z1 is 3.7 cN/dtex, Z2 is 40.0%, Z3 is 4.6%, Z4 is 9.9%, Z5 is 7.5%, and Z6 is 41%.

Example 7

(53) Specifically, a method for preparing the bi-profiled fiber, comprising the steps:

(54) (1) Preparation of spinning melt, wherein TO is 93 C., A1 is 3,3-dipropyl-propionaldehyde, A2 is acetaldehyde, A is 1:1.8:0.03, the catalyst is antimony trioxide, the extinction agent is titanium dioxide, the stabilizer is triphenyl phosphate, B is 0.3 MPa, C is 250 C., D is 90%, E is 0.03%, F is 0.24%, G is 0.02%, H is 42 min, I is 455 Pa, J is 264 C., k is 45 min, L is 85 Pa, M is 285 C., N is 75 min, O is 0.45 wt %, P is 26500, Q is 2.2, R is 4.5%, S is 1.25 wt %, T is 27 wt %, and the branched diol is 3,3-dipropyl-1,5-pentanediol with a formula of

(55) ##STR00009##

(56) (2) Concoction of oiling agent, wherein the crown ether is 15-crown ether-5, the potassium phosphate is potassium dodecyl phosphate, the sodium alkyl sulfonate is sodium hexadecyl sulfonate, the grade of mineral oil is 15#, t1 is 41 C., t2 is 2 h, a1 is 8, a2 is 20, a3 is 100, a4 is 15, a5 is 2, b is 68.97 wt %, b2 is 8.5 wt %, b3 is 28.4 mm.sup.2/s, b4 is 0.94 mm.sup.2/s, c1 is 122N, c2 is 26.8 cN/cm, c3 is 1.810.sup.8 .Math.cm, .sub.s is 0.263, .sub.d is 0.268, .sub.s1 is 0.210, .sub.d1 is 0.320, and d is 13 wt %;

(57) (3) Manufacture of the bi-profiled fiber through the processes of melt metering, extruding via the composite spinneret, cooling, oiling, drawing, heat setting and winding, wherein Ti is 280 C., T2 is 25 C., P1 is 0.29 MPa, V1 is 2600 m/min, T2 is 82 C., V2 is 3900 m/min, T3 is 135 C., V3 is 3840 m/min, P0 is 120 bar, P is 0.58 bar/day, U is 0.97, W1 is 2.08 mm, W2 is 2.08 mm, W3 is 0.48 mm, and X is 1:10.

(58) For the finally obtained bi-profiled fiber, D1 is 3.4 dtex, Y1 is 0.8210.sup.5 cN.Math.cm.sup.2, D2 is 0.22 dtex, Y2 is 0.008510.sup.5 cN cm.sup.2. D3 is 200 dtex, Z1 is 3.9 cN/dtex, Z2 is 40.0%, Z3 is 5.0%, Z4 is 10.0%, Z5 is 7.5%, and Z6 is 43%.

Example 8

(59) Specifically, a method for preparing the bi-profiled fiber, comprising the steps:

(60) (1) Preparation of spinning melt, wherein TO is 94 C., A1 is 4,4-dipropyl-butyraldehyde, A2 is acetaldehyde, A is 1:1.9:0.04, the catalyst is antimony glycolate, the extinction agent is titanium dioxide, the stabilizer is trimethyl phosphate, B is 0.3 MPa, C is 260 C., D is 93%, E is 0.04%, F is 0.21%, G is 0.03%, H is 45 min, I is 475 Pa, J is 265 C., k is 48 min, L is 88 Pa, M is 283 C., N is 80 min, O is 0.6 wt %, P is 23000, Q is 2.0, R is 3%, S is 1.4 wt %, T is 50 wt %, and the branched diol is 4,4-dipropyl-1,7-heptanediol with a formula of

(61) ##STR00010##

(62) (2) Concoction of oiling agent, wherein the crown ether is 2-hydroxymethyl-12-crown ether-4, the potassium phosphate is potassium dodeca-tetradecanol phosphate, the sodium alkyl sulfonate is sodium pentadecyl sulfonate, the grade of mineral oil is 16#, t1 is 45 C., t2 is 3 h, a1 is 9, a3 is 80, a4 is 12, a5 is 5, b is 83.33 wt %, b2 is 14 wt %,b3 is 30.0 mm.sup.2/s, b4 is 0.93 mm.sup.2/s, c1 is 127N, c2 is 23.5 cN/cm, c3 is 1.510.sup.8 .Math.cm, .sub.s is 0.262, .sub.d is 0.273, .sub.s1 is 0.2038, .sub.d1 is 0.328, and d is 18 wt %;

(63) (3) Manufacture of the bi-profiled fiber through the processes of melt metering, extruding via the composite spinneret, cooling, oiling, drawing, heat setting and winding, wherein Ti is 284 C., T2 is 20 C., P1 is 0.30 MPa, V1 is 2600 m/min, T2 is 85 C., V2 is 3700 m/min, T3 is 160 C., V3 is 3840 m/min, P0 is 120 bar, P is 0.33 bar/day, U is 0.97, W1 is 2.00 mm, W2 is 2.00 mm, W3 is 0.34 mm, and X is 1:20.

(64) For the finally obtained bi-profiled fiber, D1 is 3.5 dtex, Y1 is 1.3810.sup.5 cN.Math.cm.sup.2, D2 is 0.24 dtex, Y2 is 0.002710.sup.5 cN cm.sup.2. D3 is 250 dtex, Z1 is 3.6 cN/dtex, Z2 is 37.0%, Z3 is 4.0%, Z4 is 9.6%, Z5 is 8.0%, and Z6 is 47%.

Example 9

(65) Specifically, a method for preparing the bi-profiled fiber, comprising the steps:

(66) (1) Preparation of spinning melt, wherein TO is 95 C., A1 is 4-methyl-4-(1,1-dimethyl ethyl)-butyraldehyde, A2 is propanal, A is 1:2.5:0.05, the catalyst is antimony acetate, the extinction agent is titanium dioxide, the stabilizer is trimethyl phosphate, B is atmospheric pressure, C is 251 C., D is 96%, E is 0.05%, F is 0.22%, G is 0.04%, H is 30 min, I is 420 Pa, J is 267 C., k is 50 min, L is 80 Pa, M is 280 C., N is 90 min, O is 0.25 wt %, P is 24000, Q is 2.2, R is 4%, S is 1.0 wt %, T is 23 wt %, and the branched diol is 4-methyl-4-(1,1-dimethyl ethyl)-1,7-heptanediol with a formula of

(67) ##STR00011##

(68) (2) Concoction of oiling agent, wherein the crown ether is 2-hydroxymethyl-15-crown ether-5, the potassium phosphate is potassium dodecyl phosphate, the sodium alkyl sulfonate is sodium dodecyl sulfonate, t1 is 55 C., t2 is 1 h, a2 is 15, a3 is 90, a4 is 8, a5 is 7, b is 81.81 wt %, b2 is 10 wt %,b3 is 29.7 mm.sup.2/s, b4 is 0.94 mm.sup.2/s, c1 is 126N, c2 is 24.8 cN/cm, c3 is 1.810.sup.8 .Math.cm, .sub.s is 0.250, .sub.d is 0.264, .sub.s1 is 0.210, .sub.d1 is 0.321, and d is 10 wt %;

(69) (3) Manufacture of the bi-profiled fiber through the processes of melt metering, extruding via the composite spinneret, cooling, oiling, drawing, heat setting and winding, wherein Ti is 286 C., T2 is 21 C., P1 is 0.20 MPa, V1 is 2200 m/min, T2 is 75 C., V2 is 3700 m/min, T3 is 165 C., V3 is 3585 m/min, P0 is 20 bar, P is 0.6 bar/day, U is 0.97, W1 is 2.03 mm, W2 is 2.05 mm, W3 is 0.31 mm, and X is 1:30.

(70) For the finally obtained bi-profiled fiber, D1 is 3.5 dtex, Y1 is 1.3410.sup.5 cN.Math.cm.sup.2, D2 is 0.30 dtex, Y2 is 0.00510.sup.5 cN.Math.cm.sup.2. D3 is 280 dtex, Z1 is 4.0 cN/dtex, Z2 is 43.0%, Z3 is 4.7%, Z4 is 9.1%, Z5 is 7.0%, and Z6 is 46%.

Example 10

(71) Specifically, a method for preparing the bi-profiled fiber, comprising the steps:

(72) (1) Preparation of spinning melt, wherein TO is 90 C., A1 is 3-methyl-3-amyl-propionaldehyde, A2 is propanal, A is 1:1.2:0.06, the catalyst is antimony glycolate, the extinction agent is titanium dioxide, the stabilizer is trimethyl phosphite, B is 0.1 MPa, C is 255 C., D is 92%, E is 0.01%, F is 0.20%, G is 0.01%, H is 50 min, I is 490 Pa, J is 269 C., k is 30 min, L is 100 Pa, M is 281 C., N is 55 min, O is 0.1 wt %, P is 20000, Q is 1.9, R is 3.5%, S is 1.3 wt %, T is 44 wt %, and the branched diol is 3-methyl-3-amyl-1,6-hexanediol with a formula of

(73) ##STR00012##

(74) (2) Concoction of oiling agent, wherein the crown ether is 2-hydroxymethyl-15-crown ether-5, the potassium phosphate is potassium dodecyl phosphate, the sodium alkyl sulfonate is sodium dodecyl sulfonate, t1 is 55 C., t2 is 3 h, a2 is 15, a3 is 90, a4 is 8, a5 is 7, b is 81.81 wt %, b2 is 10 wt %,b3 is 29.7 mm.sup.2/s, b4 is 0.94 mm.sup.2/s, c1 is 126N, c2 is 24.8 cN/cm, c3 is 1.810.sup.8 g.Math.cm, .sub.s is 0.250, .sub.d is 0.264, .sub.s1 is 0.210, .sub.d1 is 0.321, and d is 10 wt %;

(75) (3) Manufacture of the bi-profiled fiber through the processes of melt metering, extruding via the composite spinneret, cooling, oiling, drawing, heat setting and winding, wherein Ti is 290 C.,T2 is 22 C., P1 is 0.22 MPa, V1 is 2400 m/min, T2 is 77 C., V2 is 3600 m/min, T3 is 135 C., V3 is 3600 m/min, P0 is 120 bar, P is 0.3 bar/day, U is 0.97, W1 is 1.66 mm, W2 is 1.66 mm, W3 is 0.17 mm, and X is 1:30.

(76) For the finally obtained bi-profiled fiber, D1 is 2.6 dtex, Y1 is 0.8410.sup.5 cN.Math.cm.sup.2, D2 is 0.21 dtex, Y2 is 0.006810.sup.5 cN.Math.cm.sup.2. D3 is 170 dtex, Z1 is 4.4 cN/dtex, Z2 is 40.0%, Z3 is 4.6%, Z4 is 9.5%, Z5 is 7.0%, and Z6 is 44%.

Example 11

(77) Specifically, a method for preparing the bi-profiled fiber, comprising the steps:

(78) (1) Preparation of spinning melt, wherein TO is 95 C., A1 is 3,3-dipentyl-propionaldehyde, A2 is acetaldehyde, A is 1:2.0:0.03, the catalyst is antimony acetate, the extinction agent is titanium dioxide, the stabilizer is trimethyl phosphite, B is 0.2 MPa, C is 250 C., D is 97%, E is 0.01%, F is 0.23%, G is 0.05%, H is 45 min, I is 500 Pa, J is 260 C., k is 40 min, L is 92 Pa, M is 277 C., N is 80 min, O is 0.35 wt %, P is 25500, Q is 1.8, R is 5%, S is 1.45 wt %, T is 41 wt %, and the branched diol is 3,3-dipropyl-1,5-pentanediol with a formula of

(79) ##STR00013##

(80) (2) Concoction of oiling agent, wherein the crown ether is 2-hydroxymethyl-12-crown ether-4, the potassium phosphate is potassium dodecyl phosphate, the sodium alkyl sulfonate is sodium dodecyl sulfonate, the grade of mineral oil is 9#, t1 is 40 C., t2 is 1 h, a1 is 2, a2 is 10, a3 is 90, a4 is 8, a5 is 3, b is 79.6 wt %, b2 is 14.5 wt %,b3 is 29.6 mm.sup.2/s, b4 is 0.93 mm.sup.2/s, c1 is 125N, c2 is 24.8 cN/cm, c3 is 1.310.sup.8 .Math.cm, .sub.s is 0.255, .sub.d is 0.266, .sub.s1 is 0.203, .sub.d1 is 0.320, and d is 20 wt %;

(81) (3) Manufacture of the bi-profiled fiber through the processes of melt metering, extruding via the composite spinneret, cooling, oiling, drawing, heat setting and winding, wherein Ti is 290 C., T2 is 25 C., P1 is 0.25 MPa, V1 is 2200 m/min, T2 is 80 C., V2 is 3800 m/min, T3 is 165 C., V3 is 3680 m/min, P0 is 120 bar, P is 0.52 bar/day, U is 0.97, W1 is 1.05 mm, W2 is 1.06 mm, W3 is 0.52 mm, and X is 1:10.

(82) For the finally obtained bi-profiled fiber, D1 is 2.5 dtex, Y1 is 0.9010.sup.5 cN.Math.cm.sup.2, D2 is 0.20 dtex, Y2 is 0.002710.sup.5 cN.Math.cm.sup.2. D3 is 190 dtex, Z1 is 4.5 cN/dtex, Z2 is 43.0%, Z3 is 5.0%, Z4 is 9.5%, Z5 is 8.0%, and Z6 is 48%.