Low-shrinkage polyester industrial yarn and preparation method thereof

Abstract

A low-shrinkage polyester industrial yarn and a preparation method thereof are provided. The preparation method includes the following steps: subjecting the modified polyester to polycondensation, melting, measuring, extruding, cooling, oiling, stretching, heat setting and winding, wherein the content of the crown ether in the oil agent is 67.30-85.58 wt %. The material of the prepared low shrinkage polyester industrial yarn is a modified polyester, the molecular chain of the modified polyester includes a terephthalic acid segment, an ethylene glycol segment, and a branched diol segment, and the structural formula of the branched diol is as follows: ##STR00001## Wherein R.sub.1 and R.sub.2 are each independently selected from a linear alkylene group having 1-3 carbon atoms, R.sub.3 is selected from an alkyl group having 1-5 carbon atoms, and R.sub.4 is selected from an alkyl group consisting of 2-5 carbon atoms.

Claims

1. A low-shrinkage polyester industrial yarn, wherein the low-shrinkage polyester industrial yarn is made of a modified polyester, and a molecular chain of the modified polyester comprises a terephthalic acid segment, an ethylene glycol segment and a branched diol segment; a structural formula of the branched diol segment is as follows: ##STR00015## wherein each of R.sub.1 and R.sub.2 is selected from a linear alkylene group having 1-3 carbon atoms, R.sub.3 is selected from an alkyl group having 1-5 carbon atoms, and R4 is selected from an alkyl group having 2-5 carbon atoms; a dry heat shrinkage of the low-shrinkage polyester industrial yarn is 2.5-4.7% under an environment of 190° C., 15 min and 0.01 cN/dtex.

2. The low-shrinkage polyester industrial yarn of claim 1, wherein the low-shrinkage polyester industrial yarn has a fineness of 550-4400 dtex, a linear density deviation rate of ±1.5%, a breaking strength larger than 7.0 cN/dtex, a breaking strength CV value lower than 3.0%, an elongation at break center value of 19.0-21.0%, an elongation at break deviation rate of ±2.0%, an elongation at break CV value lower than 8.0%, a network of 4-9 units/m, and an oil content of 0.60±0.20%.

3. The low-shrinkage polyester industrial yarn 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 20,000-27,000 and a molecular weight distribution index of 1.8-2.2; a molar content of the branched diol segment in 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-pentanediol; 4,4-diethyl-1,7-heptanediol; 4,4-di(1,-methylidene)-1,7-heptanediol; 3,3-dipropyl-1,5-pentanediol; 4,4-dipropyl-1,7-heptanediol; 4-methyl-4-(1,1-dimethylethyl)-1,7-heptanediol; 3-methyl-3-pentyl-1,6-hexanediol or 3,3-dipentyl-1,5-pentylene diol.

4. The low-shrinkage polyester industrial yarn of claim 1, 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 20,000-27,000 and a molecular weight distribution index of 1.8-2.2; a molar content of the branched diol segment in 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-pentanediol; 4,4-diethyl-1,7-heptanediol; 4,4-di(1,-methylidene)-1,7-heptanediol; 3,3-dipropyl-1,5-pentanediol; 4,4-dipropyl-1,7-heptanediol; 4-methyl-4-(1,1-dimethylethyl)-1,7-heptanediol; 3-methyl-3-pentyl-1,6-hexanediol or 3,3-dipentyl-1,5-pentylene diol.

5. The low-shrinkage polyester industrial yarn of claim 4, wherein the modified polyester is prepared by: uniformly mixing terephthalic acid, 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: uniformly stirring the terephthalic acid, the ethylene glycol and the branched diol into the slurry; adding a catalyst and a stabilizer into the slurry to obtain a first mixture; carrying out the esterification reaction on the first mixture under a nitrogen atmosphere to obtain a second mixture, wherein during the esterification reaction, a first pressure is increased from a normal pressure to 0.3 MPa, a temperature is 250-260° C., and the esterification reaction ends when a water distillation amount in the esterification reaction reaches large than or equal to 90% of a theoretical value; (2) the polycondensation reaction comprises: after the esterification reaction ends, carrying out a low vacuum stage of the polycondensation reaction on the second mixture under a condition of negative pressure; wherein during the low vacuum stage of the polycondensation reaction, a second pressure is pumped smoothly from the normal pressure to a first absolute pressure under 500 Pa in 30-50 min, a first reaction temperature is 260-270° C., and a first reaction time is 30-50 min; then continuously vacuuming, and carrying out a high vacuum stage of the polycondensation reaction on the second mixture to obtain the modified polyester, wherein during the high vacuum stage of the polycondensation reaction, a third pressure is further reduced to a second absolute pressure under 100 Pa, a second reaction temperature is 275-285° C., a second reaction time is 50-90 min.

6. The low-shrinkage polyester industrial yarn of claim 5, wherein a molar ratio of the terephthalic acid, the ethylene glycol to the branched diol is 1:(1.2-2.0): (0.03-0.06), the catalyst is added in an amount of 0.01-0.05% by weight of the terephthalic acid, and the stabilizer is added in an amount of 0.01-0.05% by weight of the terephthalic acid; the catalyst is antimony trioxide, ethylene glycol antimony or antimony acetate, and the stabilizer is triphenyl phosphate, trimethyl phosphate or trimethyl phosphite.

7. A method for preparing the low-shrinkage polyester industrial yarn of claim 1, comprising performing solid phase polycondensation, melting, metering, extruding, cooling, oiling, drawing, heat setting and winding on the modified polyester; wherein an oil agent in the oiling contains a crown ether, and a content of the crown ether is 30-85.58 wt%; wherein the oil agent is dispersed in water to obtain an emulsion having a concentration of 14-18% by weight.

8. The method of claim 6, wherein an intrinsic viscosity of the modified polyester after the solid phase polycondensation is 1.0-1.2 dL/g; and a replacement cycle of a spinning assembly is greater than or equal to 40 days.

9. The method of claim 7, wherein a heat loss of the oil agent is less than 15 wt% after the oil agent is heat-treated at 200 ° C. for 2 hours; the oil agent has a kinematic viscosity of 27.5-30.1mm.sup.2/s at (50 ±0.01) ° C., and the kinematic viscosity of the oil agent after being disposed in a concentration of 10 wt% is 0.93-0.95 mm.sup.2/s; an oil film strength of the oil agent is 121-127 N; a surface tension of the oil agent is 23.2-26.8 cN/cm, and a specific resistance of the oil agent is 1.0x10.sup.8-1.8x10.sup.8f2cm; after the oiling, a static friction coefficient between the low-shrinkage polyester industrial yarns is 0.250-0.263, and a dynamic friction coefficient between the low- shrinkage polyester industrial yarns is 0.262-0.273; after the oiling, a static friction coefficient between the low-shrinkage polyester industrial yarn and a metal is 0.202-0.210, and a dynamic friction coefficient between the low-shrinkage polyester industrial yarn and the metal is 0.320-0.332; the crown ether is 2-hydroxymethyl-12-crown-4, 15-crown-5 or 2-hydroxymethyl-15-crown-5; the oil agent further comprises a mineral oil, a potassium phosphate salt, a trimethylolpropane laurate and a sodium alkyl sulfonate; the mineral oil is one selected from the group consisting of mineral oils of 94-174; the potassium phosphate salt is a potassium salt of lauryl phosphate, an isomeric tridecyl polyoxyethylene ether phosphate potassium salt or a tetradecyl alcohol phosphate potassium salt; the sodium alkyl sulfonate is sodium dodecyl sulfate, sodium pentadecyl sulfonate or sodium hexadecyl sulfonate.

10. The method of claim 8, wherein a method for preparing the oil agent comprises uniformly mixing the crown ether, the potassium phosphate salt, the trimethylolpropane laurate and the sodium alkylsulfonate obtain a mixture; adding the mixture to the mineral oil and stirring to obtain the oil agent; wherein an amount of each of the mineral oil, the phosphate potassium salt, the trimethylolpropane laurate, the crown ether, and the sodium alkyl sulfonate by weight is as follows: mineral oil 0-10 parts; trimethylolpropane laurate 0-20 parts; crown ether 70-100 parts; phosphate potassium salt 8-15 parts; sodium alkyl sulfonate 2-7 parts; the mixing is carried out at a normal temperature, a temperature of the stirring is 40 to 55 ° C., and a time of the stirring is 1 hour to 3 hours.

11. The method of claim 9, wherein a plurality of spinning process parameters of the low-shrinkage polyester industrial yarn are as follows: a temperature of each zone of a screw is 290-320 ° C.; a temperature of a cabinet is 295-300° C.; a head pressure is 170 ±5 Bar; a side blowing temperature is 23 ±2 ° C.; a side blowing humidity is 80 ±5%; a side blowing air velocity is 0.55±0.10m/s; a pre-network pressure is 0.16±0.02MPa; network pressure is 0.20±0.02MPa; a winding speed is 2600-3400m/min; process parameters for stretching and the heat setting are: GR-1 speed is 500-600m/min; GR-2 speed is 520-1000m/min; GR-2 temperature is 80-100° C.; GR-3 speed is 1800-2500m/min; GR-3 temperature is 100-150° C.; GR-4 speed is 2800-3500m/min; GR-4 temperature is 200-250° C.; GR-5 speed is 2800-3500m/min; GR-5 temperature is 200-250° C.; GR-6 speed is 2600-3400m/min; GR-6 temperature is 150-220° C.

12. The method of claim 7, wherein the low-shrinkage polyester industrial yarn has a fineness of 550-4400 dtex, a linear density deviation rate of ±1.5%, a breaking strength larger than 7.0 cN/dtex, a breaking strength CV value lower than 3.0%, an elongation at break center calue of 19.0-21.0%, an elongation at break deviation rate of ±2.0%, an elongation at break CV value lower than 8.0%, a network of 4-9units/ m, and an oil content of 0.60±0.20%.

13. The method of claim 7, 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 20,000-27,000 and a molecular weight distribution index of 1.8-2.2; a molar content of the branched diol segment in 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 -diethy 1-1,5-pentanediol ; 4,4-diethyl- 1,7-heptanediol; 4,4-di (1 ,-methylidene)-1,7-heptanediol; 3,3 -dipropyl-1,5-pentanediol; 4,4-dipropyl-1,7-heptanediol; 4-methyl-4-(1,1-dimethylethyl)-1,7-heptanediol; 3-methyl- 3-pentyl-1,6-hexanediol or 3,3-dipentyl-1,5-pentylene diol.

14. The method of claim 13, wherein the modified polyester is prepared by: uniformly mixing terephthalic acid, 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: uniformly stirring the terephthalic acid, the ethylene glycol and the branched diol into the slurry; adding a catalyst and a stabilizer into the slurry to obtain a first mixture; carrying out the esterification reaction on the first mixture under a nitrogen atmosphere to obtain a second mixture, wherein during the esterification reaction, a first pressure is increased from a normal pressure to 0.3 MPa, a temperature is 250-260 ° C., and the esterification reaction ends when a water distillation amount in the esterification reaction reaches large than or equal to 90% of a theoretical value; (2) the polycondensation reaction comprises: after the esterification reaction ends, carrying out a low vacuum stage of the polycondensation reaction on the second mixture under a condition of negative pressure; wherein during the low vacuum stage of the polycondensation reaction, a second pressure is pumped smoothly from the normal pressure to a first absolute pressure under 500 Pa in 30-50 min, a first reaction temperature is 260-270 ° C., and a first reaction time is 30-50min; then continuously vacuuming, and carrying out a high vacuum stage of the polycondensation reaction on the second mixture to obtain the modified polyester, wherein during the high vacuum stage of the polycondensation reaction, a third pressure is further reduced to a second absolute pressure under 100Pa, a second reaction temperature is 275-285 ° C., a second reaction time is 50-90 min.

15. The method of claim 14, wherein a molar ratio of the terephthalic acid, the ethylene glycol to the branched diol is 1:(1.2-2.0): (0.03-0.06), the catalyst is added in an amount of 0.01-0.05% by weight of the terephthalic acid, and the stabilizer is added in an amount of 0.01-0.05% by weight of the terephthalic acid; the catalyst is antimony trioxide, ethylene glycol antimony or antimony acetate, and the stabilizer is triphenyl phosphate, trimethyl phosphate or trimethyl phosphite.

Description

DETAILED DESCRIPTION OF THE EMBODIMENTS

(1) Hereinafter, the present invention will be described in more detail by the following examples. It should be noticed that these examples are only for illustrating the present invention and are not intended to limit the scope of the present invention. In addition, it should be noticed that after reading the content of the present invention, those skilled in this field can make various modifications or changes to the present invention, and these equivalent forms also apply to the scope of the appended claims of this application.

(2) A preparation method of low-shrinkage polyester industrial yarn comprises:

(3) (1) Preparation of Modified Polyester:

(4) a. esterification reaction; prepare a slurry from terephthalic acid, ethylene glycol and branched diol with the molar ratio of A′. Uniformly add catalyst, flatting agent and stabilizer and perform esterification reaction in the nitrogen environment with the pressure increased by B′. The temperature of esterification reaction is C. The esterification reaction ends when the distilled water reaches the theoretical value of D′. The quantity of catalyst is E of the weight of terephthalic acid, and the flatting agent is F of the weight of terephthalic acid, and the stabilizer is G of the weight of terephthalic acid.

(5) b. polycondensation reaction; after the esterification reaction, start the low vacuum stage of polycondensation from the negative pressure during which the pressure in H is pumped from atmospheric pressure to absolute pressure I, the reaction temperature is J, the reaction time is K, and then continue to pump to vacuum and enter the high vacuum stage. Decrease the pressure to absolute pressure L′, the reaction temperature is M, the reaction time is N, and modified polyester is prepared. The molecular chain of the modified polyester includes terephthalic acid segment, ethylene glycol segment and branched diol segment. The content of the cyclic oligomer in the modified polyester is O, the number average molecular weight is P, the molecular weight distribution index is Q, and the molar content of the branched diol segment in the modified polyester is R of molar content of the terephthalic acid segment.

(6) (2) The preparation of oil agent; the crown ether is mixed with the potassium phosphate salt, the trimethylolpropane laurate and the sodium alkyl sulfonate at room temperature, and then add the mixture to the mineral oil and uniformly stirred at t1 for t2 to obtain an oil agent. In terms of parts by weight, the components are added in the following amounts: mineral oil added is a1; trimethylolpropane laurate added is a2; crown ether added is a3; phosphate potassium salt added is a4; sodium alkyl sulfonate added is a5. The prepared oil has a crown ether content of b, and the oil agent has excellent high temperature resistance. The heat loss after heat treatment at 200° C. for 2 hours is b2 wt %; the viscosity of the oil agent is low, at (50±0.01) ° C., The kinematic viscosity is b3, and the kinematic viscosity of the emulsion with the concentration of 10 wt % by using water is b4; the oil film strength is high, the oil film strength is c1, the surface tension of the oil agent is c2, the specific resistance is c3, after oiling the static friction coefficient between the fiber and the fiber is μ.sub.s, the dynamic friction coefficient is μ.sub.d, the static friction coefficient between the fiber and the metal is μ.sub.s1, and the dynamic friction coefficient is μ.sub.d1. When the prepared oil agent is used, the emulsion is set to a concentration of d by using water.

(7) (3) The low-shrinkage polyester industrial yarn is prepared by subjecting the modified polyester to solid phase polycondensation and tackifying, melting, measuring, extruding, cooling, oiling, drawing, heat setting and winding, wherein the intrinsic of the modified polyester after solid phase polycondensation tackifying is E0. The replacement period of the spinning assembly is e. The spinning process's parameters of the low shrinkage polyester industrial yarn are as follows: the temperature of each zone of the screw is T1; the temperature of the box is T2; the pressure of the head is P1; The side blowing temperature is T2′; the side blowing humidity is W1; the side blowing wind speed is V2; the pre-network pressure is P0, the network pressure is P2, and the winding speed is V3; the stretching and heat setting process's parameters are: GR-1 speed It is V4; GR-2 speed is V5; GR-2 temperature is T3; GR-3 speed is V6; GR-3 temperature is T4; GR-4 speed is V7; GR-4 temperature is T5; GR-5 speed is V8; GR-5 temperature is T6; GR-6 speed is V9; GR-6 temperature is T7.

(8) The product of low-shrinkage polyester industrial yarn has a fineness of D1, a linear density deviation rate of D2, a breaking strength of Y1, a breaking strength CV value of Y2, an elongation at break center value of Y3, and an elongation at break elongation rate. Y4, the elongation at break CV value is Y5, the network quantity is Z1/m, the oil content is Z2, and the dry heat shrinkage rate at 190° C., 15 min and 0.01 cN/dtex is Z3.

(9) A method for preparing a branched diol by reacting A1, A2 and triethylamine in a nitrogen atmosphere at T0° C. for 20 min, and then adding the concentrate to a hydrogenation reactor having a Raney Nickel catalyst. The reaction is carried out at a hydrogen pressure of 2.914 MPa and at 100° C. After the reaction is completed, the catalyst is precipitated after cooling, and the solution is treated with an ion exchange resin, and then distilled under reduced pressure, separated, and purified to obtain a branched diol.

Example 1

(10) A method for preparing low-shrinkage polyester industrial yarn, comprising the steps:

(11) (1) Preparation of modified polyester, wherein A′ is 1:1.2:0.03, the catalyst is antimony trioxide, the matting agent is titanium dioxide, the stabilizer is triphenyl phosphate, B′ is atmospheric pressure, C is 250° C., D′ 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 20,000, Q is 2.0, R is 3%, and the branched diol is 2-ethyl-2-methyl-1,3-propanediol, and the structural formula is as follows:

(12) ##STR00004##

(13) (2) Preparation of oil agent, wherein the crown ether is 2-hydroxymethyl-12-crown-4, the potassium phosphate salt is potassium dodecyl phosphate, and the sodium alkyl sulfonate is dodecyl sulfonic acid. Sodium, mineral oil is 9 # mineral oil, t1 is 40° C., t2 is 1 h, a1 is 2 parts; a2 is 10 parts; a3 is 90 parts; a4 is 8 parts; a5 is 3 parts; 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 1.3×10.sup.8 Ω.Math.cm, μ.sub.s is 0.255, μ.sub.d is 0.266, μ.sub.s1 is 0.203, μ.sub.d1 is 0.320, d is 15 wt %

(14) (3) Modified polyester is subjected to solid phase polycondensation to thicken, melt, measure, extrusion, cooling, oiling, drawing, heat setting and winding to obtain low shrinkage polyester industrial yarn, wherein E0 is 11 dL/g, e is 44 days. The spinning parameters of low-shrinkage polyester industrial yarn, wherein T1 is 310° C., T2 is 297° C., P1 is 170 Bar, T2′ 23° C., W1 is 80%, V2 is 0.5 m/s, P0 is 0.16 MPa, P2 is 0.21 MPa, P2 is 0.21 MPa, V3 is 3000 m/min; the process parameters of stretching and heat setting are: V4 is 530 m/min; V5 is 750 m/min; T3 is 90° C.; V6 is 2100 m/min; T4 is 130° C.; V7 It is 3200 m/min; T5 is 230° C.; V8 is 3200 m/min; T6 is 235° C.; V9 is 3000 m/min; and T7 is 180° C.

(15) The finally obtained low shrinkage polyester industrial yarn, wherein D1 is 1500 dtex, D2 is −0.1%, Y1 is 7.7 cN/dtex, Y2 is 2.7%, Y3 is 20.3%, Y4 is −0.11%, and Y5 is 7.3%. Z1 is 7/m, Z2 is 0.8%, and Z3 is 4.7%.

Example 2

(16) A method for preparing low-shrinkage polyester industrial yarn, comprising the steps:

(17) (1) Preparation of a modified polyester, wherein A′ is 1:1.3:0.04, the branched diol is 2,2-diethyl-1,3-propanediol, and the catalyst is ethylene glycol antimony, The matting 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, 0 is 0.6 wt %, P is 27000, Q is 1.8, R is 5%, 2, 2-2 The structural formula of 1,3-propanediol is as follows:

(18) ##STR00005##

(19) (2) Preparation of oil agent, wherein the crown ether is 15-crown-5, the phosphate potassium salt is isomeric tridecyl polyoxyethylene ether phosphate potassium salt, the alkyl sulfonate sodium is pentadecyl sulfonate, and the mineral oil is 10 # mineral oil. t1 is 48° C., t2 is 3 h, a1 is 8 parts; a2 is 10 parts; a3 is 85 parts; a4 is 11 parts; a5 is 5 parts; 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 1.8×10.sup.8 Ω.Math.cm, μ.sub.s is 0.250, μ.sub.d is 0.272, μ.sub.s1 is 0.209, μ.sub.d1 is 0.329, d is 14 wt %;

(20) (3) The low-shrinkage polyester industrial yarn is obtained by solid phase polycondensation, melting, melting, metering, extruding, cooling, oiling, drawing, heat setting and winding, wherein E0 is 1.0 dL/g, e is 40 days, the spinning process parameters of low shrinkage polyester industrial yarn are as follows: T1 is 290° C.; T2 is 295° C.; P1 is 165 Bar; T2′ is 21° C.; W1 is 75%; V2 is 0.45 m/s; P0 is 0.14 MPa; P2 is 0.18 MPa; V3 is 2600 m/min; tensile, heat setting process parameters are: V4 is 500 m/min; V5 is 520 m/min; T3 is 80° C.; V6 is 1800 m/min; T4 is 100° C.; V7 is 2800 m/min; T5 is 200° C.; V8 is 2800 m/min; T6 is 200° C.; V9 is 2600 m/min; T7 is 150° C.

(21) The finally obtained low shrinkage polyester industrial yarn, wherein D1 is 550 dtex, D2 is −1.5%, Y1 is 7.0 cN/dtex, Y2 is 3.0%, Y3 is 19%, Y4 is −2%, and Y5 is 8.0%. Z1 is 4/m, Z2 is 0.4%, and Z3 is 2.5%.

Example 3

(22) A method for preparing low-shrinkage polyester industrial yarn, comprising the steps:

(23) (1) Preparation of a modified polyester, 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 matting agent is titanium dioxide, and 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., and 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 %, 2-butyl- The structural formula of 2-ethyl-1,3-propanediol is as follows:

(24) ##STR00006##

(25) (2) Preparation of an oiling agent for oiling; wherein the crown ether is 2-hydroxymethyl-15-crown-5, the potassium phosphate salt is dodecyl alcohol phosphate potassium salt, and the alkyl sulfonic acid sodium pentadecane Sodium sulfonate, mineral oil is 11 # mineral oil, t1 is 48° C., t2 is 3 h, a1 is 8 parts; a2 is 10 parts; a3 is 85 parts; a4 is 11 parts; a5 is 5 parts; 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 1.8×10.sup.8 Ω.Math.cm, μ.sub.s is 0.250, μ.sub.d is 0.272, μ.sub.s1 is 0.209, μ.sub.d1 is 0.329, d is 14 wt %;

(26) (3) The low-shrinkage polyester industrial yarn is obtained by solid phase polycondensation, melting, melting, metering, extruding, cooling, oiling, drawing, heat setting and winding, wherein E0 is 1.2 dL/g, and e is 44 days. The spinning process parameters of low shrinkage polyester industrial yarn are as follows: T1 is 320° C.; T2 is 300° C.; P1 is 175 Bar; T2′ is 25° C.; W1 is 85%. V2 is 0.65 m/s; P0 is 0.18 MPa; P2 is 0.22 MPa; V3 is 3400 m/min; the process parameters of tensile and heat setting are: V4 is 600 m/min; V5 is 1000 m/min; T3 is 100° C.; V6 2500 m/min; T4 is 150° C.; V7 is 3500 m/min; T5 is 250° C.; V8 is 3500 m/min; T6 is 250° C.; V9 is 3400 m/min; T7 is 220° C.

(27) The finally obtained low shrinkage polyester industrial yarn, wherein D1 is 4400 dtex, D2 is 1.5%, Y1 is 7.1 cN/dtex, Y2 is 2.9%, Y3 is 21%, Y4 is 2%, Y5 is 7.9%, Z1 It is 9/m, Z2 is 0.46%, and Z3 is 2.9%.

Example 4

(28) A method for preparing a low shrinkage polyester industrial yarn, the steps are as follows:

(29) (1) Preparation of modified polyester; wherein T0 is 90° C., A1 is 3,3-diethyl-propanal, A2 is acetaldehyde, A′ is 1:1.5:0.06, and the catalyst is antimony trioxide. The matting 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%, with branched binary The alcohol is 3,3-diethyl-1,5-pentanediol, and the structural formula is as follows:

(30) ##STR00007##

(31) (2) Preparation of an oiling agent for oiling; wherein the crown ether is 2-hydroxymethyl-12-crown-4, the potassium phosphate salt is potassium dodecyl phosphate, and the sodium alkylsulfonate is hexadecane. Sodium sulfonate, mineral oil is 12 # mineral oil, t1 is 40° C., t2 is 2.5 h, a1 is 5 parts; a3 is 95 parts; a4 is 9 parts; a5 is 2 parts; 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 1.0×10.sup.8 Ω.Math.cm, μ.sub.s is 0.260, μ.sub.d is 0.263, μ.sub.s1 is 0.202, μ.sub.d1 is 0.330, d is 19 wt %;

(32) (3) The low-shrinkage polyester industrial yarn is obtained by solid phase polycondensation, melting, melting, metering, extruding, cooling, oiling, drawing, heat setting and winding, wherein E0 is 1.05 dL/g, e is 41 days, the spinning process parameters of low shrinkage polyester industrial yarn are as follows: T1 is 300° C.; e is 298° C.; P1 is 168 Bar; T2′ is 22° C.; W1 is 78%; V2 is 0.48 m/s; P0 is 0.15 MPa; P2 is 0.21 MPa; V3 is 2800 m/min; the process parameters of tensile and heat setting are: V4 is 520 m/min; V5 is 700 m/min; T3 is 85° C.; V6 is 2100 m/min; T4 is 120° C.; V7 is 3000 m/min; T5 is 230° C.; V8 is 3000 m/min; T6 is 220° C.; V9 is 2800 m/min; T7 is 170° C.

(33) The finally obtained low shrinkage polyester industrial yarn, wherein D1 is 1100 dtex, D2 is −1.2%, Y1 is 7.2 cN/dtex, Y2 is 2.9%, Y3 is 20.3%, Y4 is −1.4%, and Y5 is 7.8%. Z1 is 5/m, Z2 is 0.5%, and Z3 is 3.8%.

Example 5

(34) A method for preparing a low shrinkage polyester industrial yarn, the steps are as follows:

(35) (1) Preparation of modified polyester; wherein T0 is 91° C., A1 is 4,4-diethyl-butyraldehyde, A2 is propionaldehyde, A′ is 1:1.6:0.03, and the catalyst is ethylene glycol antimony. The matting agent is titanium dioxide, the stabilizer is trimethyl phosphate, B′ is normal 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 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%, with branched The diol is 4,4-diethyl-1,7-heptanediol, and the structural formula is as follows:

(36) ##STR00008##

(37) (2) Preparation of oiling agent; wherein the crown ether is 15-crown-5, the phosphate salt is isomeric triol polyoxyethylene ether phosphate potassium salt, and the alkyl sulfonate is dodecyl Sodium sulfonate, mineral oil is 13 # mineral oil, t1 is 52° C., t2 is 2 h, a1 is 10 parts; a2 is 5 parts; a3 is 70 parts; a4 is 8 parts; a5 is 6 parts; 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 1.2×10.sup.8 Ω.Math.cm, μ.sub.s is 0.251, μ.sub.d is 0.262, μ.sub.s1 is 0.202, μ.sub.d1 is 0.332, d is 11 wt %;

(38) (3) The low-shrinkage polyester industrial yarn is obtained by solid phase polycondensation, melting, melting, metering, extruding, cooling, oiling, drawing, heat setting and winding, wherein E0 is 1.15 dL/g, e is 43 days, the spinning process parameters of low shrinkage polyester industrial yarn are as follows: T1 is 312° C.; T2 is 298° C.; P1 is 172 Bar; T2′ is 24° C.; W1 is 82%; V2 is 0.5 m/s; P0 is 0.17 MPa; P2 is 0.21 MPa; V3 is 3100 m/min; the process parameters of stretching and heat setting are: V4 is 560 m/min; V5 is 800 m/min; T3 is 90° C.; V6 is 2300 m/min; T4 is 130° C.; V7 is 3200 m/min; T5 is 230° C.; V8 is 3200 m/min; T6 is 240° C.; V9 is 3100 m/min; T7 is 210° C.

(39) The finally obtained low shrinkage polyester industrial yarn, wherein D1 is 3000 dtex, D2 is 1.1%, Y1 is 6.6 cN/dtex, Y2 is 2.8%, Y3 is 20.4%, Y4 is 1.2%, Y5 is 7.4%, Z1 It is 8/m, Z2 is 0.69%, and Z3 is 4.8%.

Example 6

(40) A method for preparing a low shrinkage polyester industrial yarn, the steps are as follows:

(41) (1) Preparation of modified polyester; T0 is 92° C., A1 is 4,4-bis(1-methylethyl)-butanal, A2 is propionaldehyde, A′ is 1:1.7:0.05, and the catalyst is antimony acetate, the matting 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 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%, with The branched diol is 4,4-bis(1,-methylethyl)-1,7-heptanediol, and the structural formula is as follows:

(42) ##STR00009##

(43) (2) Preparation of an oiling agent for oiling; wherein the crown ether is 2-hydroxymethyl-15-crown-5, the potassium phosphate salt is potassium tetradecyl phosphate, and the sodium alkylsulfonate is fifteen Sodium alkane sulfonate, mineral oil is 14 # mineral oil, t1 is 55° C., t2 is 1 h, a1 is 3 parts; a2 is 10 parts; a3 is 75 parts; a4 is 14 parts; a5 is 7 parts; 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 1.6×10.sup.8 Ω.Math.cm, μ.sub.s is 0.255, μ.sub.d is 0.267, μ.sub.s1 is 0.203, μ.sub.d1 is 0.330, d is 17.5 wt %;

(44) (3) The low-shrinkage polyester industrial yarn is obtained by solid phase polycondensation, melting, melting, metering, extruding, cooling, oiling, drawing, heat setting and winding, wherein E0 is 1.08 dL/g, e is 41 days, the spinning process parameters of low shrinkage polyester industrial yarn are as follows: T1 is 300° C.; T2 is 298° C.; P1 is 168 Bar; T2′ is 22° C.; W1 is 78%; V2 is 0.49 m/s; P0 is 0.15 MPa; P2 is 0.21 MPa; V3 is 3050 m/min; tensile, heat setting process parameters are: V4 is 520 m/min; V5 is 700 m/min; T3 is 85° C.; V6 is 2100 m/min; T4 is 120° C.; V7 is 3100 m/min; T5 is 230° C.; V8 is 3100 m/min; T6 is 220° C.; V9 is 3050 m/min; T7 is 170° C.

(45) The final low-shrinkage polyester industrial yarn D1 is 1500 dtex, D2 is −1.0%, Y1 is 7.2 cN/dtex, Y2 is 2.9%, Y3 is 20.3%, Y4 is −1.1%, Y5 is 7.4%, Z1 It is 5/m, Z2 is 0.65%, and Z3 is 3.9%.

Example 7

(46) A method for preparing a low shrinkage polyester industrial yarn, the steps are as follows:

(47) (1) Preparation of modified polyester; wherein T0 is 93° C., A1 is 3,3-dipropyl-propanal, A2 is acetaldehyde, A′ is 1:1.8:0.03, and the catalyst is antimony trioxide. The matting 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%, with branched The diol is 3,3-dipropyl-1,5-pentanediol, and the structural formula is as follows:

(48) ##STR00010##

(49) (2) Preparation of an oiling agent for oiling; wherein the crown ether is 15-crown-5, the potassium phosphate is potassium dodecyl phosphate, and the sodium alkylsulfonate is sodium hexadecylsulfonate. The mineral oil is 15 # mineral oil, t1 is 41° C., t2 is 2 h, a1 is 8 parts; a2 is 20 parts; a3 is 100 parts; a4 is 15 parts; a5 is 2 parts; 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 1.8×10.sup.8 Ω.Math.cm, μ.sub.s is 0.263, μ.sub.d is 0.268, μ.sub.s1 is 0.210, μ.sub.d1 is 0.320, d is 16 wt %;

(50) (3) The low-shrinkage polyester industrial yarn is obtained by solid phase polycondensation, melting, melting, metering, extruding, cooling, oiling, drawing, heat setting and winding, wherein E0 is 1.09 dL/g, e is 41 days, the spinning process parameters of low shrinkage polyester industrial yarn are as follows: T1 is 300° C.; T2 is 298° C.; P1 is 168 Bar; T2′ is 22° C.; W1 is 78%; V2 is 0.52 m/s; P0 is 0.15 MPa; P2 is 0.20 MPa; V3 is 2800 m/min; the process parameters of tensile and heat setting are: V4 is 520 m/min; V5 is 700 m/min; T3 is 85° C.; V6 is 2100 m/min; T4 is 120° C.; V7 is 2900 m/min; T5 is 230° C.; V8 is 2900 m/min; T6 is 210° C.; V9 is 2800 m/min; T7 is 170° C.

(51) The finally obtained low shrinkage polyester industrial yarn, wherein D1 is 1800 dtex, D2 is −0.8%, Y1 is 7.2 cN/dtex, Y2 is 2.9%, Y3 is 20.3%, Y4 is −0.7%, and Y5 is 7.3%. Z1 is 5/m, Z2 is 0.80%, and Z3 is 4.65%.

Example 8

(52) A method for preparing a low shrinkage polyester industrial yarn, the steps are as follows:

(53) (1) Preparation of modified polyester; T0 is 94° C., A1 is 4,4-dipropyl-butyraldehyde, A2 is acetaldehyde, A′ is 1:1.9:0.04, the catalyst is ethylene glycol antimony, extinction The 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%, with branched binary The alcohol is 4,4-dipropyl-1,7-heptanediol, and the structural formula is as follows:

(54) ##STR00011##

(55) (2) Preparation of the oil agent for oiling, wherein the crown ether is 2-hydroxymethyl-12-crown-4, the potassium phosphate salt is potassium tetradecyl phosphate, and the sodium alkylsulfonate is fifteen Sodium alkane sulfonate, mineral oil is 16 # mineral oil, t1 is 45° C., t2 is 3 h, a1 is 9 parts; a3 is 80 parts; a4 is 12 parts; a5 is 5 parts; 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 1.5×10.sup.8 Ω.Math.cm, μ.sub.s is 0.262, μ.sub.d is 0.273, μ.sub.s1 is 0.2038, μ.sub.d1 is 0.328, d is 18 wt %;

(56) (3) The low-shrinkage polyester industrial yarn is obtained by solid phase polycondensation, melting, melting, metering, extruding, cooling, oiling, drawing, heat setting and winding, wherein E0 is 1.12 dL/g, e is 41 days, the spinning process parameters of low shrinkage polyester industrial yarn are as follows: T1 is 300° C.; T2 is 298° C.; P1 is 168 Bar; T2′ is 22° C.; W1 is 78%; V2 is 0.52 m/s; P0 is 0.15 MPa; P2 is 0.21 MPa; V3 is 3200 m/min; tensile, heat setting process parameters are: V4 is 520 m/min; V5 is 700 m/min; T3 is 85° C.; V6 is 2100 m/min; T4 is 120° C.; V7 is 3300 m/min; T5 is 230° C.; V8 is 3300 m/min; T6 is 230° C.; V9 is 3200 m/min; T7 is 170° C.

(57) The finally obtained low shrinkage polyester industrial yarn, wherein D1 is 1900 dtex, D2 is −1.2%, Y1 is 7.2 cN/dtex, Y2 is 2.9%, Y3 is 20.3%, Y4 is −1.4%, and Y5 is 7.8%. Z1 is 5/m, Z2 is 0.5%, and Z3 is 4.7%.

Example 9

(58) A method for preparing a low shrinkage polyester industrial yarn, the steps are as follows:

(59) (1) Preparation of modified polyester; T0 is 95° C., A1 is 4-methyl-4-(1,1-dimethylethyl)-butanal, A2 is propionaldehyde, and A′ is 1:2.5:0.05, the catalyst is antimony acetate, the matting 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%, the branched diol is 4-methyl-4-(1,1-dimethylethyl)-1,7-heptanediol, and the structural formula is as follows:

(60) ##STR00012##

(61) (2) Preparation of an oiling agent for oiling; wherein the crown ether is 2-hydroxymethyl-15-crown-5, the potassium phosphate salt is potassium dodecyl phosphate, and the sodium alkylsulfonate is dodecane sodium sulfonate, t1 is 55° C., t2 is 1 h, a2 is 15 parts; a3 is 90 parts; a4 is 8 parts; a5 is 7 parts; 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 1.8×10.sup.8 Ω.Math.cm, μ.sub.s is 0.250, μ.sub.d is 0.264, μ.sub.s1 is 0.210, μ.sub.d1 is 0.321, d is 14 wt %;

(62) (3) The low-shrinkage polyester industrial yarn is obtained by solid phase polycondensation, melting, melting, metering, extruding, cooling, oiling, drawing, heat setting and winding, wherein E0 is 1.17 dL/g, e is 43 days, the spinning process parameters of low shrinkage polyester industrial yarn are as follows: T1 is 312° C.; T2 is 298° C.; P1 is 175 Bar; T2′ is 23° C.; W1 is 82%; V2 is 0.5 m/s; P0 is 0.17 MPa; P2 is 0.21 MPa; V3 is 3100 m/min; the process parameters of stretching and heat setting are: V4 is 560 m/min; V5 is 800 m/min; T3 is 90° C.; V6 is 2300 m/min; T4 is 130° C.; V7 is 3200 m/min; T5 is 230° C.; V8 is 3200 m/min; T6 is 210° C.; V9 is 3100 m/min; T7 is 210° C.

(63) The finally obtained low shrinkage polyester industrial yarn, wherein D1 is 2800 dtex, D2 is 0.25%, Y1 is 6.5 cN/dtex, Y2 is 2.85%, Y3 is 20.5%, Y4 is 0.4%, Y5 is 7.5%, Z1 It is 8/m, Z2 is 0.75%, and Z3 is 4.6%.

Example 10

(64) A method for preparing a low shrinkage polyester industrial yarn, the steps are as follows:

(65) (1) Preparation of modified polyester; T0 is 90° C., A1 is 3-methyl-3-pentyl-propanal, A2 is propionaldehyde, A′ is 1:1.2:0.06, and the catalyst is ethylene glycol antimony. The matting 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%, with branching The diol is 3-methyl-3-pentyl-1,6-hexanediol, and the structural formula is as follows:

(66) ##STR00013##

(67) (2) Preparation of an oiling agent for oiling; wherein the crown ether is 2-hydroxymethyl-12-crown-4, the potassium phosphate salt is potassium dodecyl phosphate, and the sodium alkylsulfonate is dodecane Sodium sulfonate, mineral oil is 9 # mineral oil, t1 is 40° C., t2 is 1 h; a1 is 2 parts, a2 is 10 parts; a3 is 90 parts; a4 is 8 parts; a5 is 3 parts; 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 1.3×10.sup.8 Ω.Math.cm, μ.sub.s is 0.255, μ.sub.d is 0.266, μ.sub.s1 is 0.203, μ.sub.d1 is 0.320, d is 14 wt %;

(68) (3) The low-shrinkage polyester industrial yarn is obtained by solid phase polycondensation, melting, melting, metering, extruding, cooling, oiling, drawing, heat setting and winding, wherein E0 is 1.14 dL/g, e is 43 days, the spinning process parameters of low shrinkage polyester industrial yarn are as follows: T1 is 312° C.; T2 is 298° C.; P1 is 175 Bar; T2′ is 24° C.; W1 is 82%; V2 is 0.5 m/s; P0 is 0.17 MPa; P2 is 0.21 MPa; V3 is 3100 m/min; the process parameters for tensile and heat setting are: V4 is 560 m/min; V5 is 700 m/min; T3 is 90° C.; V6 is 2300 m/min; T4 is 130° C.; V7 is 3200 m/min; T5 is 230° C.; V8 is 3200 m/min; T6 is 230° C.; V9 is 3100 m/min; T7 is 210° C.

(69) The finally obtained low shrinkage polyester industrial yarn, wherein D1 is 2300 dtex, D2 is 0.4%, Y1 is 6.4 cN/dtex, Y2 is 2.9%, Y3 is 20.4%, Y4 is 0.5%, Y5 is 7.4%, Z1 It is 8/m, Z2 is 0.76%, and Z3 is 4.7%.

Example 11

(70) A method for preparing a low shrinkage polyester industrial yarn, the steps are as follows:

(71) (1) Preparation of modified polyester; T0 is 95° C., A1 is 3,3-dipentyl-propanal, A2 is acetaldehyde, A′ is 1:2.0:0.03, the catalyst is antimony acetate, and the matting agent is Titanium dioxide, 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%, branched diol It is 3,3-dipentyl-1,5-pentanediol, and its structural formula is as follows:

(72) ##STR00014##

(73) (2) Preparation of an oiling agent; wherein the crown ether is 2-hydroxymethyl-12-crown-4, the potassium phosphate salt is potassium dodecyl phosphate, and the sodium alkylsulfonate is dodecane Sodium sulfonate, mineral oil is 12 # mineral oil, t1 is 40° C., t2 is 2.5 h, a1 is 5 parts; a3 is 95 parts; a4 is 9 parts; a5 is 2 parts; 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 1.0×10.sup.8 Ω.Math.cm, μ.sub.s is 0.260, μ.sub.d is 0.263, μ.sub.s1 is 0.202, μ.sub.d1 is 0.330, d is 18 wt %;

(74) (3) The low-shrinkage polyester industrial yarn is obtained by solid phase polycondensation, melting, melting, metering, extruding, cooling, oiling, drawing, heat setting and winding, wherein E0 is 1.18 dL/g,e is 43 days, the spinning process parameters of low shrinkage polyester industrial yarn are as follows: T1 is 312° C.; T2 is 298° C.; P1 is 170 Bar; T2′ is 24° C.; W1 is 82%; V2 is 0.5 m/s; P0 is 0.17 MPa; P2 is 0.21 MPa; V3 is 3100 m/min; the process parameters of tensile and heat setting are: V4 is 560 m/min; V5 is 900 m/min; T3 is 90° C.; V6 is 2300 m/min; T4 is 130° C.; V7 is 3200 m/min; T5 is 230° C.; V8 is 3200 m/min; T6 is 240° C.; V9 is 3100 m/min; T7 is 210° C.

(75) The finally obtained low shrinkage polyester industrial yarn, wherein D1 is 3200 dtex, D2 is 0.35%, Y1 is 6.6 cN/dtex, Y2 is 2.8%, Y3 is 20.4%, Y4 is 0.4%, Y5 is 7.4%, Z1 It is 8/m, Z2 is 0.77%, and Z3 is 4.65%.