A simulated leather liquid silicone for coating fiber fabrics and its preparation method

Abstract

This application relates to the field of liquid silicone rubber, and discloses a simulated leather liquid silicone rubber for coating fiber fabrics and a preparation method thereof. The simulated leather liquid silicone rubber is a two-component liquid silicone rubber, and the A component is prepared from the following raw materials in parts by weight: 50-80 parts of fluorinated vinyl silicone oil, 5-20 parts of vinyl MQ silicone resin, 10-30 parts of silica, and 0.1-1.5 parts of platinum catalyst; the B component is prepared from the following raw materials in parts by weight: 5-15 parts of hydrogen-containing silicone oil, 0.01-0.1 part of inhibitor, and 1-3 parts of adhesion promoter. The simulated leather liquid silicone rubber prepared in this application has the advantages of being easy to spread on fiber fabrics and having good adhesion. The cured simulated leather coating has the feel of genuine leather, good adhesion, good wear resistance, and excellent mechanical properties, and its preparation method is simple and easy to operate.

Description

Technical Field

[0001] The present application relates to the field of liquid silicone rubber, and more specifically, it relates to a simulated leather liquid silicone rubber for coating fiber fabrics and a preparation method thereof. Background Art

[0002] Simulated leather is a kind of leather made of resin materials with the texture and characteristics of genuine leather, and is widely used in different fields such as household goods, clothing, backpacks, and shoes.

[0003] Most traditional simulated leathers are made of polyurethane resin materials. However, when the simulated leather formed of polyurethane resin materials is used in an environment with strong ultraviolet rays and high temperature, the surface of the leather is prone to aging and cracking, reducing the service life of the leather. Therefore, silicone simulated leather appears. Compared with polyurethane simulated leather, this kind of leather has the properties of genuine leather, skin-friendliness, anti-ultraviolet, high and low temperature resistance, abrasion resistance, and aging resistance.

[0004] The commonly used silicone simulated leather is formed by coating a silicone simulated leather coating on the surface of a fiber fabric. However, due to the poor adhesion between the silicone coating and the fiber fabric, the formed silicone simulated leather is prone to wrinkling or peeling, reducing the quality of the silicone simulated leather. Summary of the Invention

[0005] In order to solve the problem that silicone simulated leather is prone to wrinkling or peeling, the present application provides a simulated leather liquid silicone rubber for coating fiber fabrics and a preparation method thereof.

[0006] In a first aspect, the present application provides a simulated leather liquid silicone rubber for coating fiber fabrics, adopting the following technical solution:

[0007] A simulated leather liquid silicone rubber for coating fiber fabrics, the simulated leather liquid silicone rubber is a two-component liquid silicone rubber, including component A and component B. Component A is prepared from the following raw materials in parts by weight: 50 - 80 parts of fluorinated vinyl silicone oil, 5 - 20 parts of vinyl MQ silicone resin, 10 - 30 parts of silica, and 0.1 - 1.5 parts of platinum catalyst; Component B is prepared from the following raw materials in parts by weight: 5 - 15 parts of hydrogen-containing silicone oil, 0.01 - 0.1 part of inhibitor, and 1 - 3 parts of adhesion promoter.

[0008] By adopting the above technical solution, a two-component simulated leather liquid silicone rubber composed of component A and component B is formed. After mixing component A and component B and coating them on the surface of the fiber fabric, curing is carried out under the condition of 140 °C, and then a simulated leather coating is formed.

[0009] Among them, fluorinated vinyl silicone oil and vinyl MQ silicone resin are used as the main components of Component A. The fluorinated vinyl silicone oil is a vinyl-terminated vinyl fluoride silicone oil with fluorine groups in the side chain, which has good reactivity. At the same time, the fluorine groups in the side chain make the prepared artificial leather liquid silicone have good ductility, and can be evenly and stably attached to the surface of fiber fabrics. The two-component artificial leather liquid silicone prepared in this way has good adhesion, wear resistance and anti-fouling properties after curing; vinyl MQ silicone resin has a good strengthening effect on the system, and has a synergistic effect with fluorinated vinyl silicone oil, improving the mechanical properties and rebound properties of the prepared artificial leather coating. The artificial leather prepared in this way has good resilience and is not easy to wrinkle; adding silica in the Component A system can further enhance the mechanical properties of the prepared Component A, and can further improve the wear resistance and other mechanical properties of the artificial leather coating formed after curing the artificial leather liquid silicone prepared from Component A. At the same time, silica also has a matting effect, making the artificial leather liquid silicone prepared after curing form an artificial leather coating with a genuine leather texture. The artificial leather coating formed by curing the artificial leather liquid silicone prepared from this Component A has good adhesion, wear resistance, resilience and mechanical properties; Component B has a good cross-linking and curing effect. After being mixed with Component A and cured, the prepared artificial leather liquid silicone has good ductility and adhesiveness on fiber fabrics, and the formed artificial leather coating has good adhesion and is not easy to wrinkle or peel off. At the same time, it also has good wear resistance, resilience and mechanical properties.

[0010] Preferably, the fluorine content of the fluorinated vinyl silicone oil in Component A is 1-5%, and the vinyl content is 1-3%.

[0011] By adopting the above technical solution, the fluorinated vinyl silicone oil with a relatively optimal fluorine content and vinyl content can better improve the ductility of the prepared artificial leather liquid silicone. The prepared artificial leather coating has good adhesion, wear resistance and anti-fouling properties. When the fluorine content in the fluorinated vinyl silicone oil is relatively high, the prepared artificial leather liquid silicone has a lower surface energy, resulting in a decrease in the adhesion of the prepared artificial leather coating on the surface of fiber fabrics. When the fluorine content is relatively low, the ductility of the prepared artificial leather liquid silicone decreases, and the adhesion of the prepared artificial leather coating also decreases.

[0012] Preferably, the dosage ratio of the fluorinated vinyl silicone oil to the vinyl MQ silicone resin in Component A is 1:(0.1-0.2).

[0013] By adopting the above technical solution, a relatively optimal ratio of fluorinated vinyl silicone oil and vinyl MQ silicone resin can make the prepared artificial leather coating have good adhesion, wear resistance, anti-fouling properties, resilience and mechanical properties.

[0014] Preferably, the silica in component A is modified silica obtained by modification treatment. The modified silica is prepared by the following steps: Add 55-75 parts of nano-silica powder into a kneader, spray and stir simultaneously. Spray and add 8-15 parts of vinyltrimethoxysilane. After all are added, heat up to 180-200 °C for kneading and stirring. The stirring time is 2-4 h. After stirring evenly, grind to obtain modified silica.

[0015] By adopting the above technical solution, knead and stir the nano-silica powder and vinyltrimethoxysilane to perform surface hydroxyl treatment on the nano-silica powder, improve the compatibility of silica in component A, and make the silica evenly dispersed. While improving the compatibility, the modified silica after modification treatment and the silicone resin and component B form a synergistic system, improving the ductility and adhesion of the simulated leather liquid silicone, and further improving the adhesion and leather-like feeling of the formed simulated leather coating.

[0016] Among them, vinyltrimethoxysilane is added by spraying, so that vinyltrimethoxysilane can fully and evenly contact the surface of the nano-silica powder, improve the surface modification efficiency of the nano-silica powder, and then grind to form modified silica with uniform particle size.

[0017] Preferably, the spraying rate of vinyltrimethoxysilane is 9.5-10.5 L / h, and the diameter of the spraying droplets of vinyltrimethoxysilane is 2-7 μm.

[0018] By adopting the above technical solution, controlling the spraying rate of vinyltrimethoxysilane and the diameter of the droplets within a reasonable range enables the vinyltrimethoxysilane sprayed to evenly wrap and wet the nano-silica powder while the nano-silica powder is stirred and turned, improving the modification efficiency of the nano-silica powder, enhancing the dispersion of the prepared modified silica in component A, and further improving the mechanical properties of the formed simulated leather coating.

[0019] Preferably, the platinum catalyst is a complex of platinum.

[0020] By adopting the above technical solution, using a complex of platinum as the platinum catalyst can improve the activity and selectivity of the hydrosilylation reaction, reduce the occurrence of side reactions, increase the reaction rate of the hydrosilylation reaction, and thus obtain simulated leather liquid silicone with excellent properties.

[0021] The complex of platinum preferably used in this application can be Speier catalyst or Karstedt catalyst.

[0022] Preferably, the adhesion promoter in component B is vinyltrimethoxysilane.

[0023] By adopting the above technical solution, vinyltrimethoxysilane has a three-dimensional cross-linked network structure. When the component A and component B of the simulated leather liquid silicone are cured, it can further react with hydrogen-containing silicone oil, thereby improving the cross-linking and curing efficiency of component A and component B, and further improving the adhesion of the formed simulated leather coating. At the same time, it has a good synergistic effect with component A. While improving the adhesion of the simulated leather coating, it can improve the dispersion uniformity of silica in component A, thereby improving the resilience, wear resistance and mechanical properties of the formed simulated leather coating.

[0024] Preferably, the inhibitor in component B is composed of an alkynol compound and an amine compound. The alkynol compound is at least one of methyl butynol, ethynyl cyclohexanol, and tert-butyl cyclohexanol, and the amine compound is tetramethylethylenediamine.

[0025] By adopting the above technical solution, the alkynol compound and the amine compound act synergistically, which can preferably inhibit the hydrosilylation reaction and prevent the over-crosslinking of component A and component B. The prepared simulated leather liquid coating has good adhesion, resilience and mechanical properties.

[0026] Preferably, the inhibitor in component B is composed of an alkynol compound and an amine compound with a dosage ratio of (1.5-2):1.

[0027] By adopting the above technical solution, the use of an alkynol compound and an amine compound in a preferred ratio can improve the curing stability of the simulated leather liquid silicone after mixing component B and component A, enabling component A and component B to stably cross-link and cure. When the dosage of the alkynol compound is relatively large, the prepared simulated leather coating is prone to unevenness because the volatilization of the alkynol compound makes the overall content of the inhibitor unstable. However, the use of a preferred ratio of alkynol compound and amine compound as an inhibitor in combination can reduce the occurrence of this situation, enabling the simulated leather liquid silicone to stably cross-link and cure, and the surface of the prepared simulated leather coating is flat and the curing is stable.

[0028] In a second aspect, the present application provides a preparation method for a simulated leather liquid silicone for coating fiber fabrics, adopting the following technical solution:

[0029] A preparation method for a simulated leather liquid silicone for coating fiber fabrics includes the following steps:

[0030] Add 50-80 parts of fluorine-containing vinyl silicone oil, 5-20 parts of vinyl MQ silicone resin, 10-30 parts of silica and 0.1-1.5 parts of catalyst into a reaction device, and react for 2-4 hours under the conditions of a vacuum degree of 0.1-0.5 KPa and a temperature of 25-35 °C to obtain component A;

[0031] Add 5 - 15 parts of hydrogen - containing silicone oil, 0.01 - 0.1 part of inhibitor, and 1 - 3 parts of adhesion promoter into the reaction equipment. Under the condition of 25 - 35°C, control the stirring rate at 300 - 500 r / min. After stirring evenly, component B is obtained.

[0032] By adopting the above - mentioned technical solution, a two - component simulated leather liquid silicone composed of component A and component B is prepared. The two - component simulated leather liquid silicone prepared by this preparation method has stable performance when stored alone. When in use, add component B into component A and stir evenly, then coat it on the surface of the fiber fabric, and then cure it at 140°C to cross - link the two - component simulated leather liquid silicone, obtaining a simulated leather coating with stable performance and good adhesion. This method is simple to operate and cost - saving.

[0033] Among them, under relatively optimal temperature and stirring rate, mix and stir hydrogen - containing silicone oil, adhesion promoter, and inhibitor to obtain component B with good cross - linking and curing performance. When component B is added to component A for curing, the formed simulated leather coating has good adhesion performance and mechanical properties; under relatively optimal temperature and vacuum conditions, add fluorovinyl silicone oil, vinyl MQ silicone resin, silica, and catalyst for reaction to obtain component A with good ductility and adhesiveness. The viscosity of component A prepared in this way is moderate, has good fluidity, and stable storage performance, which is convenient for adding component B subsequently and curing, and then forming a simulated leather coating with good adhesion performance, wear - resistant and stain - resistant performance, resilience performance, and mechanical properties.

[0034] In summary, the present application has the following beneficial effects:

[0035] 1. A simulated leather liquid silicone for coating fiber fabric in the present application, by introducing a fluorovinyl silicone oil with a relatively optimal proportion of fluorine - containing groups in the side chain and vinyl - terminated into the system, and stably compounding it with vinyl MQ silicone resin. The simulated leather liquid silicone prepared from component A is cured with component B containing hydrogen - containing silicone oil. The formed simulated leather coating has good adhesion, wear - resistant and stain - resistant performance, resilience performance, and mechanical properties. The prepared simulated leather is not easy to wrinkle or peel off, has a genuine leather texture, and is not easy to show folds.

[0036] 2. By introducing modified silica prepared by modifying with vinyltrimethoxysilane into component A, it has a reinforcing effect on the prepared component A, making the formed simulated leather coating have excellent mechanical properties such as tensile performance and wear - resistant performance. At the same time, add vinyltrimethoxysilane as an adhesion promoter into component B. There is a good synergistic effect between the two, further improving the adhesion of the prepared simulated leather coating.

[0037] 3. The preparation method of the simulated leather silicone for coating fiber fabrics of the present application is simple and easy to operate, saving costs. When the A component and B component of the two-component simulated leather liquid silicone are stored separately, their storage performance is stable, the curing performance is stable, the adhesion of the simulated leather coating formed after curing is good, and it has good abrasion resistance and mechanical properties. Detailed implementation manners

[0038] The following further elaborates on the present application with reference to the examples.

[0039] The following are the specifications of some raw materials in the present application. See Table 1 below.

[0040] Table 1 Raw material specification table

[0041]

[0042] Preparation example of modified silica

[0043] Preparation example 1

[0044] The modified silica is prepared by the following steps:

[0045] Add 27.5 kg of nano-silica powder into a kneader, stir while spraying, spray and add 4 kg of vinyltrimethoxysilane, control the spraying rate of vinyltrimethoxysilane at 9.5 L / h, and the diameter of the sprayed droplets of vinyltrimethoxysilane is 2 μm. After all the spraying is added, heat up to 180 °C for kneading and stirring, the stirring time is 2 h, and after stirring evenly, grind to obtain the modified silica.

[0046] Preparation examples 2 - 3

[0047] The differences between preparation examples 2 - 3 and preparation example 1 are that the dosages of raw materials and reaction conditions are different. See Table 2 below for details.

[0048] Table 2 Raw material dosages and reaction condition table of preparation examples 1 - 3

[0049]

[0050]

[0051] Preparation comparative example 1

[0052] The difference between preparation comparative example 1 and preparation example 2 is that in preparation comparative example 1, the spraying addition method is replaced by the direct addition method, and the others remain unchanged.

[0053] Preparation comparative example 2

[0054] The difference between preparation comparative example 2 and preparation example 2 is that in preparation comparative example 2, the diameter of the sprayed droplets is 15 μm, and the others remain unchanged.

[0055] Preparation of Comparative Example 3

[0056] The difference between the preparation of Comparative Example 3 and Preparation Example 2 is that in the preparation of Comparative Example 3, vinyltrimethoxysilane was replaced with γ-propyltrimethoxysilane in equal amounts, and the others remained unchanged.

[0057] Examples

[0058] Example 1

[0059] A simulated leather liquid silicone for coating fiber fabrics was prepared by the following steps:

[0060] 25 kg of fluorinated vinyl silicone oil, 8 kg of vinyl MQ silicone resin, 5 kg of silica prepared in Preparation Example 1 and 0.05 kg of Speier catalyst were added to the reaction equipment, and reacted for 2 h under the conditions of a vacuum degree of 0.1 KPa and a temperature of 25 °C to obtain Component A;

[0061] 2.5 kg of hydrogen-containing silicone oil, 0.003 kg of ethynylcyclohexanol, 0.002 kg of tetramethylethylenediamine and 0.5 kg of vinyltrimethoxysilane were added to the reaction equipment, and under the condition of a temperature of 25 °C, the stirring rate was controlled at 300 r / min, and after stirring evenly, Component B was obtained.

[0062] Examples 2 - 3

[0063] The difference between Examples 2 - 3 and Example 1 is that in Examples 2 - 3, the dosages of raw materials and reaction conditions are different. For details, see Table 3 below.

[0064] Table 3 Dosages of raw materials and reaction conditions for Examples 1 - 3

[0065]

[0066]

[0067] Example 4

[0068] The difference between Example 4 and Example 2 is that in Example 4, the dosages and proportions of fluorinated vinyl silicone oil and vinyl MQ silicone resin in Component A are different. The dosage of fluorinated vinyl silicone oil is 32 kg, and the dosage of vinyl MQ silicone resin is 3.2 kg, and the others are the same as in Example 2.

[0069] Example 5

[0070] The difference between Example 5 and Example 2 is that in Example 5, the dosages and proportions of fluorinated vinyl silicone oil and vinyl MQ silicone resin are different. The dosage of fluorinated vinyl silicone oil is 32 kg, and the dosage of vinyl MQ silicone resin is 6.4 kg, and the others are the same as in Example 2.

[0071] Example 6

[0072] The difference between Example 6 and Example 2 is that the source of silica in Component A in Example 6 is different. The silica in Component A in Example 7 is sourced from commercially available nano-silica powder (particle size 50 - 100 nm), and the rest is the same as in Example 2.

[0073] Example 7

[0074] The difference between Example 7 and Example 2 is that the source of silica in Component A in Example 7 is different. The silica in Component A in Example 7 is sourced from the preparation of Comparative Example 1, and the rest is the same as in Example 2.

[0075] Example 8

[0076] The difference between Example 8 and Example 2 is that the source of silica in Component A in Example 8 is different. The silica in Component A in Example 8 is sourced from the preparation of Comparative Example 2, and the rest is the same as in Example 2.

[0077] Example 9

[0078] The difference between Example 9 and Example 2 is that the source of silica in Component A in Example 9 is different. The silica in Component A in Example 9 is sourced from the preparation of Comparative Example 3, and the rest is the same as in Example 2.

[0079] Comparative Example

[0080] Comparative Example 1

[0081] The difference between Comparative Example 1 and Example 2 is that in Component A of Comparative Example 1, the vinyl MQ silicone resin is replaced with fluorinated vinyl silicone oil in equal amounts, and the rest is the same as in Example 2.

[0082] Comparative Example 2

[0083] The difference between Comparative Example 2 and Example 2 is that in Component A of Comparative Example 2, the fluorinated vinyl silicone oil is replaced with vinyl MQ silicone resin in equal amounts, and the rest is the same as in Example 2.

[0084] Comparative Example 3

[0085] The difference between Comparative Example 3 and Example 2 is that the adhesion promoter is not added to Component B, and the rest is the same as in Example 2.

[0086] Comparative Example 4

[0087] The difference between Comparative Example 4 and Example 2 is that the inhibitor is not added to Component B, and the rest is the same as in Example 2.

[0088] Performance Detection Test

[0089] The following performance tests were conducted on the simulated leather liquid silicone rubber of the above Examples 1-9 and Comparative Examples 1-4:

[0090] The A and B components of the above Examples 1-9 and Comparative Examples 1-4 were mixed evenly at a dosage ratio of 6:1, coated on the surface of a polyurethane fiber layer with a specification of length * width * thickness of 10 cm * 10 cm * 0.3 cm, and then cured at a temperature of 140 °C to cure the simulated leather liquid silicone rubber. The curing time was 5 min. After curing, a simulated leather coating with a thickness of 0.1 cm was formed on the surface of the polyurethane fiber layer. In this way, simulated leather was prepared. Then, the performance tests were carried out on the simulated leather with the simulated leather coating:

[0091] 1. Handfeel test

[0092] Five testers were selected to conduct handfeel touch tests on the prepared simulated leather respectively, and the touch test results were recorded. The handfeel grades were as follows: Grade 1 - hard handfeel, Grade 2 - relatively hard handfeel, Grade 3 - average handfeel, Grade 4 - relatively soft handfeel, Grade 5 - very soft and comfortable handfeel. The test results were tested and recorded.

[0093] 2. Tensile strength test

[0094] Using a material testing machine, referring to ASTM-D412 "Test Method for Tensile Properties of Vulcanized Rubber and Thermoplastic Elastomers", the tensile strength was detected and the results were recorded.

[0095] 3. Adhesion test

[0096] Referring to GB / T 8808-1988 "Test Method for Peel Strength of Soft Composite Plastic Materials", the peel strength was detected and the results were recorded.

[0097] 4. Abrasion resistance test

[0098] Using a TABER abrasion tester, in accordance with GB / T 2726-2005 "Determination of Abrasion Resistance of Leather - Physical and Mechanical Tests", the abrasion resistance revolutions were detected and the results were recorded.

[0099] 5. Resilience test

[0100] Referring to GB / T 1681-2009 "Determination of Resilience of Vulcanized Rubber", the resilience rate was detected and the results were recorded.

[0101] The detection data of the handfeel, tensile strength, adhesion, abrasion resistance and resilience of the prepared simulated leather coatings in Examples 1-9 and Comparative Examples 1-4 are shown in Table 4 below.

[0102] Table 4 Detection data table of simulated leather coatings in Examples 1-9 and Comparative Examples 1-4

[0103]

[0104] Combined with Examples 1-5 and Comparative Examples 1-2 and Table 4, it can be seen that adding fluorinated vinyl silicone oil with a relatively optimal fluorine-containing group ratio and vinyl-terminated and vinyl MQ silicone resin to Component A can improve the ductility and adhesiveness of the prepared artificial leather liquid silicone, resulting in an increase in the peel strength of the formed artificial leather coating. The peel strength can reach 23.5 MPa. At the same time, the formed artificial leather coating has good tensile strength, resilience, wear resistance and stain resistance. The prepared artificial leather has a soft touch and the texture of genuine leather. In Comparative Example 1, only fluorinated vinyl silicone oil is used, and in Comparative Example 2, only vinyl MQ silicone resin is used. The peel strength of the prepared artificial leather coating decreases significantly, the wear resistance also decreases, the resilience decreases, and the touch is also relatively hard.

[0105] Combined with Examples 1-3, Examples 6-9 and Comparative Example 3 and Table 4, it can be seen that adding modified silica to Component A can improve the tensile strength and wear resistance of the prepared artificial leather coating. Adding an adhesion promoter to Component B can improve the peel strength of the formed artificial leather coating. There is a good synergistic effect between the two, further improving the adhesion of the prepared artificial leather coating. In Example 6, when directly using nano-silica powder to prepare the artificial leather liquid silicone, the tensile strength and wear resistance of the formed artificial leather coating are significantly reduced, the rebound rate is relatively low, and the touch is also relatively hard. In Comparative Example 3, when the adhesion promoter is not added, the peel strength of the formed artificial leather coating decreases, and the tensile strength and wear resistance also decrease slightly.

[0106] Combined with Examples 1-3 and Comparative Example 4 and Table 4, it can be seen that an inhibitor with an optimal ratio can improve the crosslinking and curing efficiency of the artificial leather liquid silicone, and the resilience and wear resistance of the prepared artificial leather coating are both improved.

[0107] This specific embodiment is only an explanation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A simulated leather liquid silicone for coating fiber fabrics, characterized in that, The simulated leather liquid silicone is a two-component liquid silicone, including component A and component B. Component A is prepared from the following raw materials in parts by weight: 50-80 parts of fluorinated vinyl silicone oil, 5-20 parts of vinyl MQ silicone resin, 10-30 parts of silica, and 0.1-1.5 parts of platinum catalyst; Component B is prepared from the following raw materials in parts by weight: 5-15 parts of hydrogen-containing silicone oil, 0.01-0.1 part of inhibitor, and 1-3 parts of adhesion promoter; The fluorine content of the fluorinated vinyl silicone oil in component A is 1-5%, the vinyl content is 1-3%, and the viscosity at 25°C is 1000-10000 cps; The vinyl content of the vinyl MQ silicone resin is 1-1.5%, MQ ratio: (0.6-0.9):1, and the viscosity at 25°C is 4000-7000 cps; The dosage ratio of the fluorinated vinyl silicone oil to the vinyl MQ silicone resin in component A is 1:(0.1-0.2); The silica in component A is modified silica, which is prepared by the following steps: Add 55-75 parts of nano-silica powder to a kneader, spray and stir at the same time, spray and add 8-15 parts of vinyltrimethoxysilane, after all are added, heat up to 180-200°C for kneading and stirring, the stirring time is 2-4h, after stirring evenly, grind to obtain modified silica; The spraying rate of vinyltrimethoxysilane is 9.5-10.5 L / h, and the diameter of the spraying droplets of vinyltrimethoxysilane is 2-7 µm.

2. The imitation leather liquid silicone for coating fiber fabric according to claim 1, wherein, The platinum catalyst is a platinum complex.

3. The simulated leather liquid silicone for coating fiber fabrics according to claim 1, characterized in that, The adhesion promoter in component B is vinyltrimethoxysilane.

4. The simulated leather liquid silicone for coating fiber fabric according to claim 1, wherein, The inhibitor in component B is composed of an alkynol compound and an amine compound. The alkynol compound is at least one of methyl butynol, ethynyl cyclohexanol, and tert-butyl cyclohexanol, and the amine compound is tetramethylethylenediamine.

5. The simulated leather liquid silicone for coating fiber fabrics according to claim 4, characterized in that, The inhibitor in component B is composed of an alkynol compound and an amine compound in a dosage ratio of (1.5-2):

1.

6. A preparation method of a simulated leather liquid silicone for coating fiber fabrics according to any one of claims 1-5, comprising the following steps: Add 50-80 parts of fluorinated vinyl silicone oil, 5-20 parts of vinyl MQ silicone resin, 10-30 parts of silica, and 0.1-1.5 parts of catalyst to a reaction device, and react for 2-4h under the conditions of a vacuum degree of 0.1-0.5 KPa and a temperature of 25-35°C to obtain component A; Add 5-15 parts of hydrogen-containing silicone oil, 0.01-0.1 part of inhibitor, and 1-3 parts of adhesion promoter to a reaction device, and control the stirring rate at 300-500 r / min under the conditions of 25-35°C, and stir evenly to obtain component B.

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