Organosilicon synthetic leather and preparation method thereof

Abstract

The present invention relates to an organosilicon synthetic leather and a preparation method thereof. The organosilicon synthetic leather comprises a surface glue layer, a bottom glue layer, and a base layer which are overlapped sequentially. The preparation method comprises the steps of: mixing the main raw materials of the surface glue layer in a proper proportion to obtain a surface glue; mixing the main raw materials of the bottom glue layer in a proper proportion to obtain a bottom glue; coating and curing the surface glue on a release paper, coating the bottom glue on the cured surface glue to form the bottom glue layer, then compositing the bottom glue layer with the base layer and curing composited bottom glue layer, and striping the release paper to obtain the organosilicon synthetic leather. The inventive organosilicon synthetic leather has excellent safety, wear resistance, antifouling property and flame retardancy.

Claims

1. An organosilicon synthetic leather, wherein the organosilicon synthetic leather comprises a base layer, a bottom glue layer, and a surface glue layer which are stacked sequentially, the surface glue layer is prepared from the following main raw materials in parts by mass: an organopolysiloxane, 100 parts, an organic hydrogenated polysiloxane, 0.1 to 10 parts, a vinyl MTQ silicon resin, 1 to 60 parts, a spherical vinyl MQ silicon resin, 10 to 100 parts, a platinum catalyst, 0.01 to 5 parts, an inhibitor, 0.01 to 2 parts, a filler, 1 to 60 parts, and a dye paste, 0 to 10 parts; the bottom glue layer is prepared from the following main raw materials in parts by mass: an organopolysiloxane, 100 parts, an organic hydrogenated polysiloxane, 0.1 to 10 parts, a vinyl MTQ silicon resin, 1 to 60 parts, a platinum catalyst, 0.01 to 5 parts, an inhibitor, 0.01 to 2 parts, a filler, 1 to 60 parts, and a dye paste, 1 to 10 parts; wherein an average composition formula (1) of the vinyl MTQ silicon resin is as follows:
(R.sup.1.sub.3SiO.sub.1/2).sub.a[(CH.sub.2═CH)R.sup.2.sub.2SiO.sub.1/2].sub.b(R.sup.3SiO.sub.3/2).sub.c(SiO.sub.4/2).sub.d  (1) wherein R.sup.1, R.sup.2 and R.sup.3 are identical or different substituents, R.sup.1, R.sup.2 and R.sup.3 are selected from the group consisting of an alkyl, an aryl, an aryl-substituted alkyl, an alkenyl, gamma-glycidyloxypropyl, gamma-(methacryloxy)propyl, and 2-(3,4-epoxycyclohexyl); and a, b, c, and d are all positive numbers and satisfy the following requirements: a+b+c+d=1, 0.5≤(a+b+c)/d≤1.5, and 3≤(a+b)/c≤8; an average composition formula (2) of the spherical vinyl MQ silicon resin is as follows:
(R.sup.4.sub.3SiO.sub.1/2).sub.a[(CH.sub.2═CH)R.sup.5.sub.2SiO.sub.1/2].sub.b(SiO.sub.4/2).sub.c  (2) wherein R.sup.4 and R.sup.5 are identical or different substituents, R.sup.4 and R.sup.5 are selected from the group consisting of an alkyl, an aryl, an aryl-substituted alkyl, an alkenyl, gamma-glycidyloxypropyl, gamma-(methacryloxy)propyl, and 2-(3,4-epoxycyclohexyl); and a, b and c are all positive numbers and satisfy the following requirements: a+b+c=1 and 0.5≤(a+b)/c≤1.5; on average, each molecule of the organopolysiloxane has at least two alkenyl groups; and each molecule of the organic hydrogenated polysiloxane has at least two hydrogen atoms bonded to a silicon atom.

2. The organosilicon synthetic leather according to claim 1, wherein, the surface glue layer is prepared from the following main raw materials in parts by mass: an organopolysiloxane, 100 parts, an organic hydrogenated polysiloxane, 1 to 8 parts, a vinyl MTQ silicon resin, 25 to 45 parts, a spherical vinyl MQ silicon resin, 30 to 80 parts, a platinum catalyst, 0.1 to 4 parts, an inhibitor, 0.01 to 2 parts, a filler, 5 to 45 parts, and a dye paste, 0 to 10 parts; the bottom glue layer is prepared from the following main raw materials in parts by mass: an organopolysiloxane, 100 parts, an organic hydrogenated polysiloxane, 2 to 7 parts, a vinyl MTQ silicon resin, 15 to 55 parts, a platinum catalyst, 0.1 to 4 parts, an inhibitor, 0.01 to 2 parts, a filler, 5 to 60 parts, and a dye paste, 1 to 10 parts; wherein the average composition formula (2) of the spherical vinyl MQ silicon resin is as follows:
(R.sup.4.sub.3SiO.sub.1/2).sub.a[(CH.sub.2═CH)R.sup.5.sub.2SiO.sub.1/2].sub.b(SiO.sub.4/2).sub.c  (2) wherein R.sup.4 and R.sup.5 are identical or different substituents, R.sup.4 and R.sup.5 are selected from the group consisting of an alkyl, an aryl, an aryl-substituted alkyl, an alkenyl, gamma-glycidyloxypropyl, gamma-(methacryloxy)propyl, and 2-(3,4-epoxycyclohexyl); and a, b and c are all positive numbers and satisfy the following requirements: a+b+c=1 and 0.7≤(a+b)/c≤1.3.

3. The organosilicon synthetic leather according to claim 1, wherein in the surface glue layer, a ratio of total moles of active hydrogen atoms to total moles of vinyl groups is 0.5 to 4.5; the total moles of the active hydrogen atoms are moles of hydrogen atoms directly bonded to silicon atoms in the organic hydrogenated polysiloxane; the total moles of the vinyl groups are a sum of moles of vinyl groups in the vinyl MTQ silicon resin, moles of vinyl groups in the spherical vinyl MQ silicon resin, and moles of vinyl groups in the organopolysiloxane.

4. The organosilicon synthetic leather according to claim 1, wherein in the bottom glue layer, a ratio of total moles of active hydrogen atoms to total moles of vinyl groups is 0.5 to 4.5; the total moles of the active hydrogen atoms are moles of hydrogen atoms directly bonded to silicon atoms in the organic hydrogenated polysiloxane; the total moles of the vinyl groups are a sum of moles of vinyl groups in the vinyl MTQ silicon resin and moles of vinyl groups in the organopolysiloxane.

5. The organosilicon synthetic leather according to claim 1, wherein a mass fraction of vinyl groups in the spherical vinyl MQ silicon resin is 0.1% to 10%, or/and a mass fraction of vinyl groups in the vinyl MTQ silicon resin is 0.1% to 10%, or/and a mass fraction of vinyl groups in the organopolysiloxane is 0.02% to 0.3%, or/and a mass fraction of hydrogen atoms directly bonded to silicon atoms in the organic hydrogenated polysiloxane is 0.1% to 1.6%.

6. The organosilicon synthetic leather according to claim 5, wherein the mass fraction of vinyl groups in the spherical vinyl MQ silicon resin is in a range from 1% to 4.5%, or/and the mass fraction of vinyl groups in the vinyl MTQ silicon resin is in a range from 1% to 6%, or/and the mass fraction of vinyl groups in the organopolysiloxane is in a range from 0.06% to 0.25%, or/and the mass fraction of hydrogen atoms directly bonded to silicon atoms in the organic hydrogenated polysiloxane is in a range from 0.5% to 1.2%.

7. The organosilicon synthetic leather according to claim 1, wherein the spherical vinyl MQ silicon resin has a particle diameter ranging from 1 μm to 10 μm.

8. The organosilicon synthetic leather according to claim 1, wherein the organopolysiloxane has an average composition formula (3) as follows:
R.sup.6.sub.aSiO.sub.(4-a)/2  (3) wherein R.sup.6 is a substituted or unsubstituted monovalent hydrocarbyl group which is the same or different from each other and is directly bonded to a silicon atom, and a satisfies 1.5≤a≤2.8, and the organopolysiloxane has a viscosity ranging from 500 mPa.Math.s to 500,000 mPa.Math.s at 25° C.

9. The organosilicon synthetic leather according to claim 1, wherein the organic hydrogenated polysiloxane has a viscosity ranging from 1 mPa.Math.s to 1,000 mPa.Math.s at 25° C., or/and an amount of Pt atoms in the platinum catalyst is 1,000 ppm to 20,000 ppm, and the platinum catalyst is at least one selected from the group consisting of platinum black, platinum-loaded silica, platinum-loaded alumina, platinum-loaded carbon black, chloroplatinic acid, a solution of chloroplatinic acid in isopropanol, a solution of chloroplatinic acid in ethanol, platinum-1,3 divinyltetramethyldisiloxane complex, a platinum-tetravinylcyclotetrasiloxane complex, and a platinum-enyne complex.

10. A method of preparing an organosilicon synthetic leather according to claim 1, comprising the steps of: (1) uniformly mixing the raw materials of the surface glue layer according to claim 1 to obtain a surface glue; (2) coating a release paper; performing heat curing to obtain a cured surface glue layer; (3) uniformly mixing the raw materials of the bottom glue layer according claim 1 to obtain a bottom glue; and (4) coating the cured surface glue layer with the bottom glue to form the bottom glue layer, compositing the bottom glue layer with a base layer; performing heat curing; striping the release paper to obtain the organosilicon synthetic leather.

11. The organosilicon synthetic leather according to claim 2, wherein a mass fraction of vinyl groups in the spherical vinyl MQ silicon resin is 0.1% to 10%, or/and a mass fraction of vinyl groups in the vinyl MTQ silicon resin is 0.1% to 10%, or/and a mass fraction of vinyl groups in the organopolysiloxane is 0.02% to 0.3%, or/and a mass fraction of hydrogen atoms directly bonded to silicon atoms in the organic hydrogenated polysiloxane is 0.1% to 1.6%.

12. The organosilicon synthetic leather according to claim 3, wherein a mass fraction of vinyl groups in the spherical vinyl MQ silicon resin is 0.1% to 10%, or/and a mass fraction of vinyl groups in the vinyl MTQ silicon resin is 0.1% to 10%, or/and a mass fraction of vinyl groups in the organopolysiloxane is 0.02% to 0.3%, or/and a mass fraction of hydrogen atoms directly bonded to silicon atoms in the organic hydrogenated polysiloxane is 0.1% to 1.6%.

13. The organosilicon synthetic leather according to claim 2, wherein the spherical vinyl MQ silicon resin has a particle diameter ranging from 1 to 10 μm.

14. The organosilicon synthetic leather according to claim 3, wherein the spherical vinyl MQ silicon resin has a particle diameter ranging from 1 to 10 μm.

15. The organosilicon synthetic leather according to claim 2, wherein the organopolysiloxane has an average composition formula (3) as follows:
R.sup.6.sub.aSiO.sub.(4-a)/2  (3) wherein R.sup.6 is a substituted or unsubstituted monovalent hydrocarbyl group which is the same or different from each other and is directly bonded to a silicon atom, and a satisfies 1.5≤a≤2.8, and the organopolysiloxane has a viscosity ranging from 500 mPa.Math.s to 500,000 mPa.Math.s at 25° C.

16. The organosilicon synthetic leather according to claim 3, wherein the organopolysiloxane has an average composition formula (3) as follows:
R.sup.6.sub.aSiO.sub.(4-a)/2  (3) wherein R.sup.6 is a substituted or unsubstituted monovalent hydrocarbyl group which is the same or different from each other and is directly bonded to a silicon atom, and a satisfies 1.5≤a≤2.8, and the organopolysiloxane has a viscosity ranging from 500 mPa.Math.s to 500,000 mPa.Math.s at 25° C.

17. The organosilicon synthetic leather according to claim 2, wherein the organic hydrogenated polysiloxane has a viscosity ranging from 1 mPa.Math.s to 1,000 mPa.Math.s at 25° C., or/and an amount of Pt atoms in the platinum catalyst is 1,000 ppm to 20,000 ppm, and the platinum catalyst is at least one selected from the group consisting of platinum black, platinum-loaded silica, platinum-loaded alumina, platinum-loaded carbon black, chloroplatinic acid, a solution of chloroplatinic acid in isopropanol, a solution of chloroplatinic acid in ethanol, platinum-1,3 divinyltetramethyldisiloxane complex, a platinum-tetravinylcyclotetrasiloxane complex, and a platinum-enyne complex.

18. The organosilicon synthetic leather according to claim 3, wherein the organic hydrogenated polysiloxane has a viscosity ranging from 1 mPa.Math.s to 1,000 mPa.Math.s at 25° C., or/and an amount of Pt atoms in the platinum catalyst is 1,000 ppm to 20,000 ppm, and the platinum catalyst is at least one selected from the group consisting of platinum black, platinum-loaded silica, platinum-loaded alumina, platinum-loaded carbon black, chloroplatinic acid, a solution of chloroplatinic acid in isopropanol, a solution of chloroplatinic acid in ethanol, platinum-1,3 divinyltetramethyldisiloxane complex, a platinum-tetravinylcyclotetrasiloxane complex, and a platinum-enyne complex.

19. A method of preparing an organosilicon synthetic leather according to claim 2, comprising the steps of: (1) uniformly mixing the raw materials of the surface glue layer according to claim 2 to obtain a surface glue; (2) coating a release paper; performing heat curing to obtain a cured surface glue layer; (3) uniformly mixing the raw materials of the bottom glue layer according to claim 2 to obtain a bottom glue; and (4) coating the cured surface glue layer with the bottom glue to form the bottom glue layer, compositing the bottom glue layer with a base layer; performing heat curing; striping the release paper to obtain the organosilicon synthetic leather.

20. A method of preparing an organosilicon synthetic leather according to claim 3, comprising the steps of: (1) uniformly mixing the raw materials of the surface glue layer according claim 3 to obtain a surface glue; (2) coating a release paper; performing heat curing to obtain a cured surface glue layer; (3) uniformly mixing the raw materials of the bottom glue layer according to claim 3 to obtain a bottom glue; and (4) coating the cured surface glue layer with the bottom glue to form the bottom glue layer, compositing the bottom glue layer with a base layer; performing heat curing; striping the release paper to obtain the organosilicon synthetic leather.

Description

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

(1) The present invention will be specifically described below by specific embodiments, but the present invention is not limited by the following specific embodiments. The term “parts” in the following specific embodiments represents “parts by mass”.

(2) In the following preparation process, in order to uniformly mix the filler and the organopolysiloxane, it is known in the art that a treating agent such as hexamethyldisilazane, dimethyldichlorosilane, trimethylchlorosilane, vinyltrimethoxy, vinyltriethoxysilane, or the like may be added to treat the surface of the filler. Unless otherwise stated, other mixing processes are existing conventional techniques.

(3) In the following examples, the organopolysiloxane, the organic hydrogenated polysiloxane, the vinyl MTQ silicon resin, and the spherical vinyl MQ silicon resin are provided by Jiangxi Jiayi New Material Co., Ltd. The dye paste and the platinum catalyst are produced by Guagnzhou Xibo Chemical Technology Co., Ltd. Unless otherwise stated, other raw materials used are commercially available.

(4) In the following examples, the organopolysiloxane (A) used is as shown in Table 1.

(5) TABLE-US-00001 TABLE 1 Performance parameters of organopolysiloxane Viscosity Vinyl (mPa .Math. s, content at 25° C.) (wt %) Name of organopolysiloxane A-1 10,000 0.2 dimethylvinylsiloxy-terminated A-2 20,000 0.13 dimethylsiloxane/methylvinylsiloxane A-3 5,000 0.16 copolymer

(6) In the following examples, the organic hydrogenated polysiloxane (B) used is as shown in Table 2:

(7) TABLE-US-00002 TABLE 2 Performance parameters of organic hydrogenated polysiloxane Viscosity Hydrogen (mPa .Math. s, content Name of organic hydrogenated at 25° C.) (wt %) polysiloxane B-1 50 1 Poly(methylhydrosiloxane) B-2 100 0.5 terminated with trimethylsiloxy B-3 200 1.2 groups B-4 200 0.75

(8) In the following examples, the average composition formula of the vinyl MTQ silicon resin (C) used is as follows.
(R.sup.1.sub.3SiO.sub.1/2).sub.a[(CH.sub.2═CH)R.sup.2.sub.2SiO.sub.1/2].sub.b(R.sup.3SiO.sub.3/2).sub.c(SiO.sub.4/2).sub.d

(9) The groups and related parameters in the average composition formula of the vinyl MTQ silicon resin are shown in Table 3:

(10) TABLE-US-00003 TABLE 3 Groups and related parameters in the average composition formula of vinyl MTQ silicon resin Vinyl content (wt %) R.sup.1 R.sup.2 R.sup.3 a b c d (a + b + c)/d (a + b)/c C-1 0.8 Methyl Methyl Methyl 0.3 0.02 0.1 0.58 0.72 3.2 C-2 3.3 Methyl Methyl Methyl 0.334 0.086 0.08 0.50 1.0 5.25 C-3 5.2 Methyl Methyl Methyl 0.36 0.14 0.08 0.42 1.38 6.25

(11) In the following examples, the average composition formula of the spherical vinyl MQ silicon resin (D) used is as follows:
(R.sup.4.sub.3SiO.sub.1/2).sub.a[(CH.sub.2═CH)R.sup.5.sub.2SiO.sub.1/2].sub.b(SiO.sub.4/2).sub.c,

(12) The groups and related parameters in the average composition formula of the spherical vinyl MQ silicon resin are shown in Table 4:

(13) TABLE-US-00004 TABLE 4 Groups and related parameters in the average composition formula of spherical vinyl MQ silicon resin Vinyl Particle content diameter (wt %) (μm) R.sup.4 R.sup.5 a b c (a + b)/c D-1 2.5 3 Methyl Methyl 0.385 0.065 0.55 0.81 D-2 0.30 8 Methyl Methyl 0.3525 0.0075 0.64 0.56 D-3 4.4 5 Methyl Methyl 0.46 0.12 0.42 1.38 d-1 2.5 13 Methyl Methyl 0.385 0.065 0.55 0.81

(14) The raw materials and properties of the organosilicon synthetic leathers of Examples 1 to 8 are shown in Table 5:

(15) TABLE-US-00005 TABLE 5 Raw materials and properties of the organosilicon synthetic leather of Examples 1 to 8 Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Example 7 Example 8 Surface organopolysiloxane A-1 100 100 100 — 100 100 100 100 glue A-2 — — — 100 — — — — layer organic B-1 5 9 7 — — — 7 6 hydrogenated B-3 — — — 8.5 6.5 9 — — polysiloxane vinyl MTQ silicon C-1 — — — 50 — — — — resin C-2 20 10 11 — 25 5 — 10 C-3 — — — — — — 10 — spherical vinyl MQ D-1 30 55 — — 45 75 55 — silicon resin D-2 — — 20 — — — — — D-3 — — — 15 — — — — d-1 — — — — — — — 55 Ratio of silicon to hydrogen 0.84 1.28 3.03 2.31 0.98 1.3 0.90 0.85 platinum-1,3 1.5 1.5 1.5 1.5 1.5 1.5 1.5 1.5 divinyltetramethyldisiloxane complex (the mass content of Pt is 8,000 ppm) Fumed silica (a specific surface 20 20 20 20 20 20 20 20 area of 200 m.sup.2/g) Ethynylcyclohexanol 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Dye paste 5 5 5 5 5 5 5 5 Bottom organopolysiloxane A-1 100 100 100 100 100 100 100 100 glue organic B-2 8 8 8 8 8 8 8 8 layer hydrogenated polysiloxane vinyl MTQ silicon C-2 15 15 15 15 15 15 15 15 resin Ratio of silicon to hydrogen 1.55 1.55 1.55 1.55 1.55 1.55 1.55 1.55 Solution of chloroplatinic acid in 2.5 2.5 2.5 2.5 2.5 2.5 2.5 2.5 isopropanol (the mass content of Pt is 30,000 ppm) Fumed silica (a specific surface 20 20 20 20 20 20 20 20 area of 200 m.sup.2/g) Ethynylcyclohexanol 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5 Dye paste 10 10 10 10 10 10 10 10 Base layer substrate Dacron cloth 1 Wear resistance test 1 Grade 5 Grade 5 Grade 5 Grade 5 Grade 5 Grade 5 Grade 5 Grade 4 Wear resistance test 2 Grade 5 Grade 5 Grade 5 Grade 5 Grade 5 Grade 5 Grade 5 Grade 4 2 Hydrolysis resistance test No No No change No No change No change No change No change change change change 3 Flame retardant test 1 Pass Pass Pass Pass Pass Pass Pass Pass Flame retardant test 2 Pass Pass Pass Pass Pass Pass Pass Pass Flame retardant test 3 Pass Pass Pass Pass Pass Pass Pass Pass 4 Cytotoxicity test Grade 0 Grade 0 Grade 0 Grade 0 Grade 0 Grade 0 Grade 0 Grade 0 5 Skin allergy test Grade 0 Grade 0 Grade 0 Grade 0 Grade 0 Grade 0 Grade 0 Grade 0 6 Anti-fouling property test Grade 4 Grade 4 Grade 4 Grade 4 Grade 4 Grade 4 Grade 4 Grade 4 7 Smoothness test A A A A A A A A 8 Peel test 30N 32N 31N 30N 33N 32N 30N 28N
Note: In the surface glue layer, the ratio of silicon to hydrogen refers to a ratio of the total moles of active hydrogen atoms to the total moles of vinyl groups; the total moles of active hydrogen atoms are the moles of hydrogen atoms directly bonded to silicon atoms in the organic hydrogenated polysiloxane; the total moles of the vinyl groups are the sum of the moles of vinyl groups in the vinyl MTQ silicon resin, the moles of vinyl groups in the spherical vinyl MQ silicon resin, and the moles of vinyl groups in the organopolysiloxane. In the bottom glue layer, the ratio of silicon to hydrogen refers to a ratio of the total moles of active hydrogen atoms to the total moles of vinyl groups; the total moles of the active hydrogen atoms are the moles of hydrogen atoms directly bonded to silicon atoms in the organic hydrogenated polysiloxane; the total moles of the vinyl groups are the sum of the moles of vinyl groups in the vinyl MTQ silicon resin and the moles of vinyl groups in the organopolysiloxane.

(16) The raw materials and properties of the organosilicon synthetic leathers of Examples 9 to 13 are shown in Table 6:

(17) TABLE-US-00006 TABLE 6 Raw materials and properties of the organosilicon synthetic leather of Examples 9 to 13 Example Example Example Example Example 9 10 11 12 13 Surface organopolysiloxane A-1 100 100 100 100 100 glue organic B-3 6.5 6.5 6.5 6.5 6.5 layer hydrogenated polysiloxane vinyl MTQ C-2 25 25 25 25 25 silicon resin spherical D-1 45 45 45 45 45 vinyl MQ silicon resin Ratio of silicon to 0.98 0.98 0.98 0.98 0.98 hydrogen platinum-1,3 1.5 1.5 1.5 1.5 1.5 divinyltetramethyldisiloxane complex (the mass content of Pt is 8,000 ppm) Fumed silica (a 20 20 20 20 20 specific surface area of 200 m.sup.2/g) Ethynylcyclohexanol 0.5 0.5 0.5 0.5 0.5 Dye paste 5 5 5 5 5 Bottom organopolysiloxane A-1 — 100 — 100 — glue A-2 — — 100 — 100 layer A-3 100 — — — — organic B-2 — — 5 — — hydrogenated B-3 3 2 — 2.5 — polysiloxane B-4 — — — — 9.8 vinyl MTQ C-1 — — 55 8 — silicon resin C-2 25 8 — — 43 Ratio of silicon to 0.99 1.40 1.18 3.07 1.28 hydrogen Solution of 1.5 1.5 1.5 1.5 1.5 chloroplatinic acid in isopropanol (the mass content of Pt is 30,000 ppm) Fumed silica (a 20 20 20 20 20 specific surface area of 200 m.sup.2/g) Ethynylcyclohexanol 0.5 0.5 0.5 0.5 0.5 Dye paste 10 10 10 10 10 Base Base fabric obtained by blending dacron and layer substrate spandex 1 Wear resistance test 1 Grade 5 Grade 5 Grade 5 Grade 5 Grade 5 Wear resistance test 2 Grade 5 Grade 5 Grade 5 Grade 5 Grade 5 2 Hydrolysis No No No No No resistance test change change change change change 3 Flame retardant test 1 Pass Pass Pass Pass Pass Flame retardant test 2 Pass Pass Pass Pass Pass Flame retardant test 3 Pass Pass Pass Pass Pass 4 Cytotoxicity test Grade 0 Grade 0 Grade 0 Grade 0 Grade 0 5 Skin allergy test Grade 0 Grade 0 Grade 0 Grade 0 Grade 0 6 Anti-fouling test Grade 5 Grade 5 Grade 5 Grade 5 Grade 5 7 Smoothness test A A A A A 8 Peel test 31N 30N 31N 28N 30N
Note: In the surface glue layer, the ratio of silicon to hydrogen refers to a ratio of the total moles of active hydrogen atoms to the total moles of vinyl groups; the total moles of active hydrogen atoms are the moles of hydrogen atoms directly bonded to silicon atoms in the organic hydrogenated polysiloxane; the total moles of the vinyl groups are the sum of the moles of vinyl groups in the vinyl MTQ silicon resin, the moles of vinyl groups in the spherical vinyl MQ silicon resin, and the moles of vinyl groups in the organopolysiloxane. In the bottom glue layer, the ratio of silicon to hydrogen refers to a ratio of the total moles of active hydrogen atoms to the total moles of vinyl groups; the total moles of the active hydrogen atoms are the moles of hydrogen atoms directly bonded to silicon atoms in the organic hydrogenated polysiloxane; the total moles of the vinyl groups are the sum of the moles of vinyl groups in the vinyl MTQ silicon resin and the moles of vinyl groups in the organopolysiloxane.

(18) RESULTS: It can be seen from Table 5 and Table 6 that the organosilicon synthetic leathers of Examples 1 to 13 have good wear resistance, hydrolysis resistance, flame retardancy and smoothness. In addition, the raw materials of the digitally printed synthetic leathers of Examples 1 to 13 are environmentally friendly, and none of them is cytotoxic or causes skin irritation. The peeling loads of the organosilicon synthetic leathers of Examples 1 to 13 are in a range from 28N to 33N, indicating that the adhesion between the surface glue layer, the bottom glue layer and the base layer constituting the organosilicon synthetic leathers is good. It is thus understood that the organosilicon synthetic leather of the present invention has excellent safety performance, wear resistance, antifouling property, and flame retardancy.

(19) The organosilicon synthetic leathers of Comparative Examples 1 to 3 are as follows:

Comparative Example 1

(20) The raw materials for each layer of the organosilicon synthetic leather of Comparative Example 1 are the same as those in Example 11, except that the surface glue layer of Comparative Example 1 contains no spherical vinyl MQ silicon resin.

Comparative Example 2

(21) The raw materials for each layer of the organosilicon synthetic leather of Comparative Example 2 are the same as those in Example 11, except that the surface glue layer of Comparative Example 2 contains no vinyl MTQ silicon resin.

Comparative Example 3

(22) The raw materials for each layer of the organosilicon synthetic leather of Comparative Example 3 are the same as those in Example 11, except that the bottom glue layer of Comparative Example 3 contains no vinyl MTQ silicon resin.

(23) TABLE-US-00007 TABLE 7 Performances of organosilicon synthetic leathers of Comparative Examples 1 to 3 Comparative Comparative Comparative Example 1 Example 2 Example 3 1 Wear resistance test 1 Grade 2 Grade 3 Grade 4 Wear resistance test 2 Grade 2 Grade 4 Grade 4 2 Hydrolysis resistance No change No change No change test 3 Flame retardant test 1 Pass Pass Pass Flame retardant test 2 Pass Pass Pass Flame retardant test 3 Pass Pass Pass 4 Cytotoxicity test Grade 0 Grade 0 Grade 0 5 Skin allergy test Grade 0 Grade 0 Grade 0 6 Anti-fouling property Grade 2 Grade 3 Grade 3 test 7 Smoothness test B B A 8 Bond Strength 28N 15N 10N

(24) RESULTS: The surface glue layer of the organosilicon synthetic leather of Comparative Example 1 contained no spherical vinyl MQ silicon resin, which results in significant decreases in wear resistance, antifouling property, smoothness, and peeling load of the organosilicon synthetic leather of Comparative Example 1. The surface glue layer of the organosilicon synthetic leather of Comparative Example 2 contained no vinyl MTQ silicon resin, which results in significant decreases in peeling load, antifouling property and smoothness of the organosilicon synthetic leather of Comparative Example 2. The bottom glue layer of the organosilicon synthetic leather of Comparative Example 3 contained no vinyl MTQ silicon resin, which results in significant decreases in peeling load, antifouling property, smoothness, and wear resistance of the organosilicon synthetic leather of Comparative Example 3.

(25) The preparation procedures of the organosilicon synthetic leathers of the above Examples 1 to 13 and Comparative Examples 1 to 3 comprised the following steps:

(26) (1) uniformly mixing the raw materials of the surface glue layer to obtain a transparent surface glue;

(27) (2) coating a release paper with the transparent surface glue using a doctor blade at a coating speed of 5 m/min, then performing heat curing to obtain a cured surface glue layer; wherein the heat curing is performed in an oven at 100° C. for 3 minutes;

(28) (3) uniformly mixing the raw materials of the bottom glue layer to obtain a translucent bottom glue; and

(29) (4) coating the cured surface glue layer with the translucent bottom glue using a doctor blade at a coating speed of 5 m/min to obtain the bottom glue layer, compositing the bottom glue layer with the material of a base layer, performing heat curing, and then stripping away the release paper to obtain an organosilicon synthetic leather; wherein the heat curing was performed in an oven at 100° C. for 3 minutes.

(30) 1. Wear Resistance Test

(31) Wear Resistance Test 1

(32) Test method: the test was carried out in accordance with ISO/NP17076-2004, using a CS-10 grinding wheel with a load of 1000 g and a test revolution of 3000 rpm.

(33) Evaluation Standard:

(34) Grade 1: very obvious wear

(35) Grade 2: obvious wear

(36) Grade 3: distinguishable wear

(37) Grade 4: hardly distinguishable wear

(38) Grade 5: indistinguishable wear

(39) Wear Resistance Test 2

(40) Test method: the test was carried out in accordance with ASTM D 4157-13, using 10 #canvas cotton, and with a test period of 300,000 cycles.

(41) Evaluation Standard:

(42) Grade 1: coating is worn through, revealing the base fabric;

(43) Grade 2: coating is seriously worn, and pattern is smoothed;

(44) Grade 3: coating pattern is worn but clearly recognizable;

(45) Grade 4: coating pattern is hardly worn, and haze is slightly changed;

(46) Grade 5: coating has no signs of wear, and haze has no change;

(47) 2. Hydrolysis Resistance Test

(48) Test method: the test was carried out in accordance with ISO 1419:1995 with a test period of 10 weeks.

(49) 3. Flame Retardant Test:

(50) Flame Retardant Test 1:

(51) Test method: the test was carried out in accordance with FMVSS302.

(52) Flame Retardant Test 2:

(53) Test method: the test was carried out in accordance with CA 117-2013.

(54) Flame Retardant Test 3:

(55) Test method: the test was carried out in accordance with GB8410-2006.

(56) 4. Cytotoxicity Test

(57) Test method: the test was carried out in accordance with ISO10993-5.

(58) Evaluation Standard:

(59) Grade 0: no cytotoxicity

(60) Grade 1: slight cytotoxicity

(61) Grade 2: mild cytotoxicity

(62) Grade 3: moderate cytotoxicity

(63) Grade 4: severe cytotoxicity

(64) 5. Skin Allergy Test

(65) Test method: the test was carried out in accordance with IS010993-10.

(66) Evaluation Standard:

(67) Grade 0: no reaction

(68) Grade 1: weak positive reaction

(69) Grade 2: moderate positive reaction

(70) Grade 3: severe positive reaction

(71) 6. Anti-Fouling Property Test

(72) Test method: the test was carried out in accordance with CFFA-141.

(73) Evaluation Standard:

(74) Grade 1: stains not completely removed

(75) Grade 2: large areas of stains

(76) Grade 3: few stains

(77) Grade 4: stains completely removed

(78) 7. Smoothness Test

(79) Test method: the test was carried out in accordance with instructions provided by Guagnzhuo Xibo Chemical Technology Co., Ltd.

(80) Evaluation Standard:

(81) A: dry and extremely smooth, B: smooth, and C: slip-stopping

(82) 8. Bond Strength

(83) Test method: according to GB/T8949-2008, three small pieces of leather samples were sized to a length of 150 mm and a width of 30 mm. The coating was bonded to a coating of the same kind of leather with an appropriate amount of an adhesive (the samples must be firmly bonded). After being at a constant temperature of 135° C.±5° C. for 2 hours, the bonded sample was hand-peeled until the coating of the sample was separated from the base cloth at a distance of 50 mm. The separated ends were respectively clamped to the clamps of a tensile tester and peeled at a speed of 200 mm/min. The maximum peeling load of the sample was recorded.

(84) Evaluation standard: when the maximum peeling load of the sample is 18N or greater, it is considered to meet use requirements.

(85) The technical features of the aforementioned embodiments may be arbitrarily combined. For the sake of brevity of description, all possible combinations of the technical features in the above embodiments are not described. However, all combinations of these technical features should be considered as the scope of this specification, as long as there is no contradiction among the combinations.

(86) The aforementioned embodiments are merely illustrative of several embodiments of the present invention, although the description thereof is more specific and detailed, but they are not to be construed as limiting the scope of the invention. It should be noted that a number of variations and modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be determined by the appended claims.