An anti-aging and anti-tearing airbag coating and its preparation method

Abstract

This application relates to a coating material for automotive airbags. More specifically, it relates to an anti-aging and anti-tearing airbag coating and a preparation method thereof. An anti-aging and anti-tearing airbag coating comprises component A and component B. Component A includes the following components in parts by weight: 65-85 parts of vinyl silicone oil, 12-15 parts of silicone chain extender, 3-5.5 parts of silicone crosslinking agent, 0.05-0.1 part of inhibitor, and 2.5-3 parts of silane coupling agent; Component B includes the following components in parts by weight: 40-80 parts of vinyl fluorosilicone oil, 0.1-0.7 part of catalyst, 1.5-3 parts of tackifier, and 1-3 parts of antioxidant DW. The anti-aging and anti-tearing airbag coating of this application improves the problems of poor anti-tearing property and anti-aging property of existing airbags, that is, it prevents the aging and deterioration of the airbag and the reduction of strength, which may cause the airbag to tear, the seam holes to be torn, or even burst during use, posing a serious hazard to the driver or passengers.

Description

Technical Field

[0001] This application relates to the coating material for automotive airbags, and more specifically, to an anti-aging and anti-tearing airbag coating and its preparation method. Background Art

[0002] In recent years, with the expansion of the automotive market, cars have become an indispensable means of transportation. Subsequently, the safety of car use has attracted more and more attention. Airbags are important components of the passive safety system widely used in current cars. They can effectively reduce the deceleration impact and secondary collision force suffered by the occupants during a collision. In a very short time, an elastic air cushion is formed in front of or on the side of the driver or occupant, and the air pressure is released and the airbag shrinks in a timely manner to absorb the impact energy, thereby effectively protecting the human head and chest. It is an important and effective protection measure for the driver or occupant during a car collision. The types, assembly rates, and safety of airbags have also attracted increasing attention.

[0003] For existing airbags, when the gunpowder in the gas generator explodes, the airbag unfolds only 0.003 ms later and shrinks 0.2 ms later. The maximum temperature during gunpowder explosion can reach 2000 °C. Existing airbag coating materials have excellent moisture-proof, fire-proof, insulation, and sealing properties. With the development of the automotive industry, researching and developing new coating materials with excellent performance is an important topic for R & D personnel in our country, that is, to prevent the hot gas generated by the generator from escaping through the airbag coating, resulting in airbag aging and deterioration, strength reduction, and ultimately leading to airbag tearing, seam hole tearing, or even bursting, causing serious harm to the driver or occupant. Summary of the Invention

[0004] Aiming at the problems of poor tear resistance and anti-aging performance of existing airbag coatings, this application provides an anti-aging and anti-tearing airbag coating and its preparation method.

[0005] In the first aspect, this application provides an anti-aging and anti-tearing airbag coating, adopting the following technical solution:

[0006] It includes component A and component B. Component A includes the following components in parts by weight: 65 - 85 parts of vinyl silicone oil, 12 - 15 parts of silicone chain extender, 3 - 5.5 parts of silicone cross-linking agent, 0.05 - 0.1 part of inhibitor, 2.5 - 3 parts of silane coupling agent; Component B includes the following components in parts by weight: 40 - 80 parts of vinyl fluorosilicone oil, 0.1 - 0.7 part of catalyst, 1.5 - 3 parts of tackifier, 1 - 3 parts of anti-aging agent DW; The vinyl silicone oil in component A includes vinyl-terminated polydimethylsiloxane and phenyl vinyl silicone oil.

[0007] By adopting the above technical solution, a cross-linked framework is provided through the reaction of vinyl-terminated polydimethylsiloxane, phenyl vinyl silicone oil and hydrogen-containing silicone oil. The shielding effect of phenyl groups on surrounding groups improves the chemical stability of the resin to a certain extent. After the vinyl groups and hydrogen-containing groups form cross-linking and curing, the conjugated electron interaction between phenyl groups further enhances this effect, reduces the chemical activity of the resin polymer segments, improves the stability and strength of the coating film, enhances the anti-aging performance of the material, and has excellent properties such as strong solvent resistance, water resistance, ablation resistance, and high temperature resistance. At the same time, the inventor adds vinyl fluorosilicone oil to the coating and finds that the addition of phenyl vinyl silicone oil and vinyl fluorosilicone oil significantly improves the anti-aging, water and oil resistance of the coating film. This may be because, when vinyl fluorosilicone oil is added, the fluorine-containing groups in vinyl fluorosilicone oil are electron-withdrawing groups, and vinyl promotes the cross-linking density, so that vinyl fluorosilicone oil can generate intermolecular interaction forces with the above cross-linked framework and be embedded or attached to the surface of the cross-linked network system. The fluorine-containing groups such as trifluoromethyl are claw-shaped and dispersed due to the steric hindrance effect between F and F, and the fluorine groups and phenyl groups are on different silane side chains, so that some F atoms are exposed on the surface of the cross-linked system and some are dispersed between benzene rings, and are not shielded by the steric hindrance of the benzene ring. It can further enhance the shielding effect of the benzene ring, improve the anti-aging performance, and at the same time give full play to the hydrophobic and oleophobic properties of vinyl fluorosilicone oil and the anti-aging and stability of phenyl groups, and improve the cross-linking density of the system and the anti-tearing effect. In addition, it also improves the wear resistance, heat stability, oil resistance, corrosion resistance, etc. of the coating and extends the service life of the coating.

[0008] The addition of a silicone chain extender, the long chain of the chain extender can extend into the cross-linked structure to play a role in strengthening the cross-linking points, thereby improving the overall stability and mechanical properties; using a silicone cross-linking agent and ensuring the smooth progress of the cross-linking reaction to improve the reaction efficiency and effectively control the reaction process; the catalyst improves the cross-linking reaction efficiency between vinyl silicone oil and hydrogen-containing silicone oil such as silicone chain extender, promotes the activation of hydrogen-containing silicone oil and double bonds, increases the number of strong interaction points between silicone oil molecular chains and catalytic metal centers, and at the same time improves the stability of the catalyst after metal oxidative addition to prevent metal precipitation and deactivation, ensuring the smooth progress of the cross-linking reaction, and then accelerating the combination of vinyl silicone oil and cross-linking agent, chain extender, etc., ensuring that the product has good mechanical properties and stability, and enhancing the anti-tearing performance of the material; by adding a tackifier and an anti-aging agent, the densification performance and anti-aging performance of the coating material are further improved. On the other hand, adding a silane coupling agent can further improve the adhesion of the coating and avoid coating peeling.

[0009] In a specific feasible embodiment, the mass ratio of the vinyl-terminated polydimethylsiloxane to the phenyl vinyl silicone oil is (5-8):1.

[0010] By adopting the above technical solution, vinyl silicone oil within a certain proportion range helps to make the coating material perform excellently in terms of wear resistance and resistance to ultraviolet light aging, enabling the coating material to maintain good stability in the face of a relatively complex external environment and not being easily damaged, thereby extending the service life of the material. The applicant has found that the coating has good performance when the phenyl vinyl silicone oil is within the above proportion. When the phenyl content in the system is insufficient, the side chain structure is not tight enough, resulting in a small interaction force between adjacent phenyl groups and a small conjugated shielding effect, which affects the overall stability and mechanical properties of the crosslinked framework structure and the aging resistance is poor; when the phenyl content in the system is too high, there are too many phenyl groups in the side chain, which is not conducive to the crosslinking reaction of the crosslinked system, resulting in a decrease in the strength of the crosslinked system and poor aging resistance. In addition, too many phenyl groups easily cause the shielding of fluorine-containing groups, resulting in a decrease in the hydrophobic and oleophobic properties. Moreover, too many benzene rings also affect the flexibility of the coating film.

[0011] In a specific feasible embodiment, the vinyl fluorosilicone oil of component B is terminal vinyl fluorosilicone oil.

[0012] In a specific feasible embodiment, the inhibitor is diallyl maleate; the tackifier is isopropyl tris(dioctylpyrophosphate acyloxy) titanate; the silicone crosslinking agent is polymethylhydrosiloxane.

[0013] In a specific feasible embodiment, the silane coupling agent is KH560 and KH570 with a mass ratio of 1:2.

[0014] The silicone chain extender is hydrogen-terminated polydimethylsiloxane.

[0015] In a second aspect, the present application provides a method for preparing an anti-aging and anti-tear airbag coating, adopting the following technical solution:

[0016] A method for preparing an anti-aging and anti-tear airbag coating includes the following steps:

[0017] (1) According to the formulation dosage of component A, take vinyl silicone oil and silicone chain extender, stir and mix at 200 - 300 rpm for 10 - 20 min, then add silicone crosslinking agent, inhibitor, and silane coupling agent, and mix for another 10 - 15 min to prepare component A;

[0018] (2) According to the formulation dosage of component B, sequentially add vinyl fluorosilicone oil, catalyst, tackifier, and antioxidant DW, stir at 200 - 300 rpm for 20 - 30 min under normal pressure to prepare component B;

[0019] (3) Mix component A and component B evenly according to a weight ratio of 1:1 to obtain a coating solution, coat it on the surface of the substrate, and obtain an anti-aging and anti-tear airbag coating after curing treatment.

[0020] By mixing component A and component B, coating, and curing, the selection and combination of each component in the formula and the optimization of the dosage, as well as the setting of parameters in the preparation method, all ensure that the film after curing of the product has the characteristics of being thinner, having good flatness, good tensile properties, and good tear properties. Moreover, the cost is low, the preparation method is simple, and it is easy to use.

[0021] In a specific feasible embodiment, the curing treatment is at a temperature of 160 - 180 °C and a curing time of 1 - 3 min.

[0022] In summary, the present application has the following beneficial effects:

[0023] 1. The reaction of vinyl-terminated polydimethylsiloxane, phenyl vinyl silicone oil, and hydrogen-containing silicone oil provides a cross-linking framework. The shielding effect of phenyl on surrounding groups improves the chemical stability of the resin to a certain extent. And after the vinyl and hydrogen-containing groups form cross-linking and curing, the conjugated electron interaction between phenyl groups further enhances this effect, reduces the chemical activity of the resin, improves the stability and strength of the coating film, enhances the anti-aging performance of the material, and has excellent properties such as strong solvent resistance, water resistance, ablation resistance, and high-temperature resistance. The inventor also added vinyl fluorosilicone oil to the coating and found that the addition of phenyl vinyl silicone oil and vinyl fluorosilicone oil significantly improved the anti-aging, water and oil resistance of the coating film compared with the separate addition of phenyl vinyl silicone oil and vinyl fluorosilicone oil. This may be because, when vinyl fluorosilicone oil is added, the fluorine-containing group in vinyl fluorosilicone oil is an electron-withdrawing group, and vinyl promotes the cross-linking density, so that vinyl fluorosilicone oil can generate intermolecular interaction forces with the above cross-linking framework and be embedded or attached to the surface of the cross-linking network system; the fluorine-containing groups such as trifluoromethyl are dispersed in a claw shape due to the steric hindrance effect between F and F, and the fluorine groups and phenyl groups are on different silane side chains, so that some F atoms are exposed on the surface of the cross-linking system and some are dispersed between benzene rings without being shielded by the steric hindrance of the benzene ring, giving full play to the hydrophobic and oleophobic properties of vinyl fluorosilicone oil and the anti-aging and stability of phenyl, and increasing the cross-linking density of the system, improving the anti-tear effect. In addition, it also improves the wear resistance, heat stability, oil resistance, corrosion resistance, etc. of the coating, and extends the service life of the coating.

[0024] 2. When phenyl vinyl silicone oil is added in an appropriate proportion, it can cooperate with fluorosilicone oil to achieve better anti-aging effect, which helps the coating material to perform excellently in terms of wear resistance and ultraviolet light aging resistance, etc., enabling the coating material to maintain better stability in a relatively complex external environment and not being easily damaged, thus extending the service life of the material. The applicant found that when the phenyl content in the system is insufficient, the side chain structure is not tight enough, resulting in a small interaction force between adjacent phenyl groups and a small conjugate shielding effect, which affects the overall stability of the cross-linked framework structure and the anti-aging performance; when the phenyl content in the system is too high, there are too many side chain phenyl groups, which is instead not conducive to the cross-linking reaction of the cross-linking system, leading to a reduction in the strength of the cross-linking system, not being conducive to the formation of a dense coating, thereby reducing the anti-aging performance, and too many phenyl groups are likely to cause shielding of the fluorine-containing groups, resulting in a reduction in the hydrophobic and oleophobic properties. In addition, too many benzene rings also affect the flexibility of the coating film; by adding a silane coupling agent, the adhesion of the coating is further improved, and peeling of the coating is avoided. Detailed implementation manners

[0025] The following further elaborates on this application in conjunction with examples.

[0026] Some raw materials used in the preparation examples and examples:

[0027] The vinyl-terminated polydimethylsiloxane is vinyl-bis-terminated polydimethylsiloxane with a viscosity of 2000 mPa·s, purchased from Hubei Shuaiyanligao Biopharmaceutical Co., Ltd.; the model of phenyl vinyl silicone oil: lnb-1163; the vinyl-terminated fluorosilicone oil is vinyl-terminated polymethyltrifluoropropylsiloxane with a viscosity of 1000 mPa·s, purchased from Wuhan Huaxiang Kejie Biotechnology Co., Ltd.; diallyl maleate is purchased from Wuhan Kemic Biopharmaceutical Technology Co., Ltd.; the model of isopropyl tris(dioctylpyrophosphate acyloxy) titanate: HY-201; the hydrogen-terminated polydimethylsiloxane has a viscosity of 40 mPa·s, purchased from Hubei Langbowan Biopharmaceutical Co., Ltd.; polymethylhydrosiloxane is purchased from Wuhan Jixin Yibang Biotechnology Co., Ltd., model: 63148-57-2; the catalyst is Karstedt platinum catalyst, specifically model: FDW25.

[0028] For the relevant raw materials not specified in the examples and comparative examples, they are all conventional products that can be obtained through market purchase.

[0029] Examples

[0030] Example 1

[0031] An anti-aging and anti-tear airbag coating, comprising component A and component B. Component A includes the following components in parts by weight: 650 g of vinyl silicone oil, 150 g of silicone chain extender, 30 g of silicone crosslinking agent, 0.5 g of inhibitor, and 30 g of silane coupling agent; Component B includes the following components in parts by weight: 400 g of vinyl fluorosilicone oil, 4 g of catalyst, 15 g of tackifier, and 10 g of antioxidant DW. Among them, the vinyl silicone oil is vinyl-terminated polydimethylsiloxane and phenyl vinyl silicone oil, and the mass ratio of vinyl-terminated polydimethylsiloxane to phenyl vinyl silicone oil is 5:1; the vinyl fluorosilicone oil is terminal vinyl polymethyltrifluoropropylsiloxane; the silane coupling agent is KH560 and KH570 with a mass ratio of 1:2.

[0032] (1) According to the formulation dosage of component A, add vinyl silicone oil and silicone chain extender, mix at 300 rpm for 10 min, then add silicone crosslinking agent, inhibitor, and silane coupling agent, and mix for another 10 min to prepare component A.

[0033] (2) According to the formulation dosage of component B, sequentially add vinyl fluorosilicone oil, catalyst, tackifier, and antioxidant DW, and stir at 300 rpm for 20 min under normal pressure to prepare component B;

[0034] (3) Mix component A and component B evenly according to a weight ratio of 1:1 to obtain a coating solution, coat it on the surface of the substrate, the curing temperature is 180 °C, and the curing time is 1 min to obtain the anti-aging and anti-tear airbag coating.

[0035] Example 2

[0036] An anti-aging and anti-tear airbag coating, comprising component A and component B. Component A includes the following components in parts by weight: 700 g of vinyl silicone oil, 120 g of silicone chain extender, 55 g of silicone crosslinking agent, 1 g of inhibitor, and 25 g of silane coupling agent;

[0037] Component B includes the following components in parts by weight: 600 g of vinyl fluorosilicone oil, 7 g of catalyst, 30 g of tackifier, and 20 g of antioxidant DW; Among them, the vinyl silicone oil is vinyl-terminated polydimethylsiloxane and phenyl vinyl silicone oil, and the mass ratio of vinyl-terminated polydimethylsiloxane to phenyl vinyl silicone oil is 5:1; the vinyl fluorosilicone oil is terminal vinyl polymethyltrifluoropropylsiloxane; the silane coupling agent is KH560 and KH570 with a mass ratio of 1:2.

[0038] (1) According to the formulation dosage of component A, add vinyl silicone oil and silicone chain extender, mix at 300 rpm for 10 min, then add silicone crosslinking agent, inhibitor, and silane coupling agent, and mix for another 10 min to prepare component A.

[0039] (2) Add vinyl fluorosilicone oil, catalyst, tackifier, and antioxidant DW in sequence according to the formulation dosage of Component B, and stir at 300 rpm for 20 min under normal pressure to prepare Component B.

[0040] (3) After mixing Component A and Component B evenly according to a weight ratio of 1:1, a coating solution is obtained, which is coated on the surface of the substrate. The curing temperature is 180 °C and the curing time is 1 min to obtain an anti-aging and anti-tear airbag coating.

[0041] Example 3

[0042] An anti-aging and anti-tear airbag coating, comprising Component A and Component B, wherein Component A comprises the following components in parts by weight: 850 g of vinyl silicone oil, 140 g of silicone chain extender, 55 g of silicone crosslinking agent, 1 g of inhibitor, and 25 g of silane coupling agent;

[0043] Component B comprises the following components in parts by weight: 800 g of vinyl fluorosilicone oil, 1 g of catalyst, 30 g of tackifier, and 30 g of antioxidant DW; wherein, the vinyl silicone oil is vinyl-terminated polydimethylsiloxane and phenyl vinyl silicone oil, and the mass ratio of vinyl-terminated polydimethylsiloxane to phenyl vinyl silicone oil is 5:1; the vinyl fluorosilicone oil is terminal vinyl polymethyltrifluoropropylsiloxane; the silane coupling agent is KH560 and KH570 with a mass ratio of 1:2.

[0044] (1) According to the formulation dosage of Component A, add vinyl silicone oil and silicone chain extender, mix at 300 rpm for 10 min, then add silicone crosslinking agent, inhibitor, and silane coupling agent, and mix for another 10 min to prepare Component A.

[0045] (2) Add vinyl fluorosilicone oil, catalyst, tackifier, and antioxidant DW in sequence according to the formulation dosage of Component B, and stir at 300 rpm for 20 min under normal pressure to prepare Component B.

[0046] (3) After mixing Component A and Component B evenly according to a weight ratio of 1:1, a coating solution is obtained, which is coated on the surface of the substrate. The curing temperature is 180 °C and the curing time is 1 min to obtain an anti-aging and anti-tear airbag coating.

[0047] Example 4

[0048] An anti-aging and anti-tear airbag coating, comprising Component A and Component B, wherein Component A comprises the following components in parts by weight: 700 g of vinyl silicone oil, 120 g of silicone chain extender, 55 g of silicone crosslinking agent, 1 g of inhibitor, and 25 g of silane coupling agent;

[0049] Component B comprises the following components in parts by weight: 600 g of vinyl fluorosilicone oil, 7 g of catalyst, 30 g of tackifier, and 20 g of antioxidant DW; wherein, the vinyl silicone oil is vinyl-terminated polydimethylsiloxane and phenyl vinyl silicone oil, and the mass ratio of vinyl-terminated polydimethylsiloxane to phenyl vinyl silicone oil is 8:1; the vinyl fluorosilicone oil is terminal vinyl polymethyltrifluoropropylsiloxane; the silane coupling agent is KH560 and KH570 with a mass ratio of 1:2.

[0050] (1) According to the formulation dosage of Component A, add vinyl silicone oil and organosilicon chain extender, mix at 300 rpm for 10 min, then add organosilicon crosslinker, inhibitor, and silane coupling agent, and mix for another 10 min to prepare Component A.

[0051] (2) Add vinyl fluorosilicone oil, catalyst, tackifier, and antioxidant DW in sequence according to the formulation dosage of Component B, and stir at 300 rpm for 20 min under normal pressure to prepare Component B;

[0052] (3) Mix Component A and Component B evenly according to a weight ratio of 1:1 to obtain a coating solution, coat it on the surface of the substrate, the curing temperature is 180 °C, and the curing time is 1 min to obtain an anti-aging and anti-tearing airbag coating.

[0053] Example 5

[0054] An anti-aging and anti-tearing airbag coating, comprising Component A and Component B, wherein Component A comprises the following components in parts by weight: 700 g of vinyl silicone oil, 120 g of organosilicon chain extender, 55 g of organosilicon crosslinker, 1 g of inhibitor, and 25 g of silane coupling agent;

[0055] Component B comprises the following components in parts by weight: 600 g of vinyl fluorosilicone oil, 7 g of catalyst, 30 g of tackifier, and 20 g of antioxidant DW; wherein, the vinyl silicone oil is vinyl-terminated polydimethylsiloxane and phenyl vinyl silicone oil, and the mass ratio of vinyl-terminated polydimethylsiloxane to phenyl vinyl silicone oil is 6:3; the vinyl fluorosilicone oil is terminal vinyl polymethyltrifluoropropylsiloxane; the silane coupling agent is KH560 and KH570 with a mass ratio of 1:2.

[0056] (1) According to the formulation dosage of Component A, add vinyl silicone oil and organosilicon chain extender, mix at 300 rpm for 10 min, then add organosilicon crosslinker, inhibitor, and silane coupling agent, and mix for another 10 min to prepare Component A.

[0057] (2) Add vinyl fluorosilicone oil, catalyst, tackifier, and antioxidant DW in sequence according to the formulation dosage of Component B, and stir at 300 rpm for 20 min under normal pressure to prepare Component B;

[0058] (3) After mixing component A and component B evenly according to a weight ratio of 1:1, a coating solution is obtained, which is coated on the surface of the substrate. The curing temperature is 180 °C and the curing time is 1 min to obtain an anti-aging and anti-tearing airbag coating.

[0059] Example 6

[0060] An anti-aging and anti-tearing airbag coating, comprising component A and component B. Component A includes the following components in parts by weight: 700 g of vinyl silicone oil, 120 g of silicone chain extender, 55 g of silicone crosslinking agent, 1 g of inhibitor, and 25 g of silane coupling agent;

[0061] Component B includes the following components in parts by weight: 600 g of vinyl fluorosilicone oil, 7 g of catalyst, 30 g of tackifier, and 20 g of antioxidant DW; wherein, the vinyl silicone oil is vinyl-terminated polydimethylsiloxane and phenyl vinyl silicone oil, and the mass ratio of vinyl-terminated polydimethylsiloxane to phenyl vinyl silicone oil is 10:1; the vinyl fluorosilicone oil is end-vinyl polymethyltrifluoropropylsiloxane; the silane coupling agent is KH560 and KH570 with a mass ratio of 1:2.

[0062] (1) According to the formulation dosage of component A, add vinyl silicone oil and silicone chain extender, mix at 300 rpm for 10 min, then add silicone crosslinking agent, inhibitor, and silane coupling agent, and mix for another 10 min to prepare component A.

[0063] (2) Add vinyl fluorosilicone oil, catalyst, tackifier, and antioxidant DW in sequence according to the formulation dosage of component B, and stir at 300 rpm for 20 min under normal pressure to prepare component B;

[0064] (3) After mixing component A and component B evenly according to a weight ratio of 1:1, a coating solution is obtained, which is coated on the surface of the substrate. The curing temperature is 180 °C and the curing time is 1 min to obtain an anti-aging and anti-tearing airbag coating.

[0065] Comparative Example 1

[0066] An anti-aging and anti-tearing airbag coating, comprising component A and component B. Component A includes the following components in parts by weight: 700 g of vinyl silicone oil, 120 g of silicone chain extender, 55 g of silicone crosslinking agent, 1 g of inhibitor, and 25 g of silane coupling agent; wherein, the vinyl silicone oil is vinyl-terminated polydimethylsiloxane; the silane coupling agent is KH560 and KH570 with a mass ratio of 1:2;

[0067] Component B comprises the following components in parts by weight: 600 g of vinyl fluorosilicone oil, 7 g of catalyst, 30 g of tackifier, and 20 g of antioxidant DW; wherein, the vinyl fluorosilicone oil is terminal vinyl polymethyltrifluoropropyl siloxane.

[0068] (1) According to the formulation dosage of Component A, add vinyl silicone oil and organosilicon chain extender, mix at 300 rpm for 10 min, then add organosilicon crosslinker, inhibitor, and silane coupling agent, and mix for another 10 min to prepare Component A.

[0069] (2) Add vinyl fluorosilicone oil, catalyst, tackifier, and antioxidant DW in sequence according to the formulation dosage of Component B, and stir at 300 rpm for 20 min under normal pressure to prepare Component B;

[0070] (3) Mix Component A and Component B evenly according to a weight ratio of 1:1 to obtain a coating solution, coat it on the surface of the substrate, the curing temperature is 180 °C, and the curing time is 1 min to obtain an anti-aging and anti-tear airbag coating.

[0071] Comparative Example 2

[0072] An anti-aging and anti-tear airbag coating, comprising Component A and Component B, wherein Component A comprises the following components in parts by weight: 700 g of vinyl silicone oil, 120 g of organosilicon chain extender, 55 g of organosilicon crosslinker, 1 g of inhibitor, and 25 g of silane coupling agent; wherein, the vinyl silicone oil is phenyl vinyl silicone oil; the silane coupling agent is KH560 and KH570 with a mass ratio of 1:2.

[0073] Component B comprises the following components in parts by weight: 600 g of vinyl fluorosilicone oil, 7 g of catalyst, 30 g of tackifier, and 20 g of antioxidant DW; the vinyl fluorosilicone oil is terminal vinyl polymethyltrifluoropropyl siloxane.

[0074] (1) According to the formulation dosage of Component A, add vinyl silicone oil and organosilicon chain extender, mix at 300 rpm for 10 min, then add organosilicon crosslinker, inhibitor, and silane coupling agent, and mix for another 10 min to prepare Component A.

[0075] (2) Add vinyl fluorosilicone oil, catalyst, tackifier, and antioxidant DW in sequence according to the formulation dosage of Component B, and stir at 300 rpm for 20 min under normal pressure to prepare Component B;

[0076] (3) Mix Component A and Component B evenly according to a weight ratio of 1:1 to obtain a coating solution, coat it on the surface of the substrate, the curing temperature is 180 °C, and the curing time is 1 min to obtain an anti-aging and anti-tear airbag coating.

[0077] Comparative Example 3

[0078] An anti-aging and anti-tear airbag coating, comprising component A and component B, wherein component A comprises the following components in parts by weight: 700 g of vinyl silicone oil, 120 g of silicone chain extender, 55 g of silicone crosslinking agent, 1 g of inhibitor, and 25 g of silane coupling agent;

[0079] Component B comprises the following components in parts by weight: 600 g of vinyl-terminated polydimethylsiloxane, 7 g of catalyst, 30 g of tackifier, and 20 g of antioxidant DW; wherein, the vinyl silicone oil is vinyl-terminated polydimethylsiloxane and phenyl vinyl silicone oil, and the mass ratio of vinyl-terminated polydimethylsiloxane to phenyl vinyl silicone oil is 5:1; the silane coupling agent is KH560 and KH570 with a mass ratio of 1:2.

[0080] (1) According to the formulation dosage of component A, add vinyl silicone oil and silicone chain extender, mix at 300 rpm for 10 min, then add silicone crosslinking agent, inhibitor, and silane coupling agent, and mix for another 10 min to prepare component A.

[0081] (2) According to the formulation dosage of component B, sequentially add vinyl fluorosilicone oil, catalyst, tackifier, and antioxidant DW, and stir at 300 rpm for 20 min under normal pressure to prepare component B;

[0082] (3) Mix component A and component B evenly according to a weight ratio of 1:1 to obtain a coating solution, coat it on the surface of the substrate, the curing temperature is 180 °C, and the curing time is 1 min to obtain the anti-aging and anti-tear airbag coating.

[0083] Comparative Example 4

[0084] An anti-aging and anti-tear airbag coating, comprising component A and component B, wherein component A comprises the following components in parts by weight: 820 g of vinyl silicone oil, 55 g of silicone crosslinking agent, 1 g of inhibitor, and 25 g of silane coupling agent;

[0085] Component B comprises the following components in parts by weight: 600 g of vinyl fluorosilicone oil, 7 g of catalyst, 30 g of tackifier, and 20 g of antioxidant DW; wherein, the vinyl silicone oil is vinyl-terminated polydimethylsiloxane and phenyl vinyl silicone oil, and the mass ratio of vinyl-terminated polydimethylsiloxane to phenyl vinyl silicone oil is 5:1; the vinyl fluorosilicone oil is terminal vinyl polymethyltrifluoropropylsiloxane; the silane coupling agent is KH560 and KH570 with a mass ratio of 1:2.

[0086] (1) According to the formulation dosage of component A, add vinyl silicone oil and silicone chain extender, mix at 300 rpm for 10 min, then add silicone crosslinking agent, inhibitor, and silane coupling agent, and mix for another 10 min to prepare component A.

[0087] (2) Add vinyl fluorosilicone oil, catalyst, tackifier, and antioxidant DW successively according to the formulation dosage of Component B, and stir at 300 rpm for 20 min under normal pressure to obtain Component B.

[0088] (3) After mixing Component A and Component B evenly according to a weight ratio of 1:1, a coating solution is obtained. Coat it on the surface of the substrate, with a curing temperature of 180 °C and a curing time of 1 min to obtain an anti-aging and anti-tearing airbag coating.

[0089] Performance testing

[0090] Apply an anti-aging and anti-tearing airbag coating solution prepared in the examples and comparative examples on the surface of a nylon 66 substrate to form a thin film, and conduct performance tests on this thin film using the following methods:

[0091] a. Tensile strength: Test according to GB / T528-1998;

[0092] b. Tear strength: Test according to GB / T528-1999;

[0093] c. Anti-aging test: After subjecting the airbag coating to damp heat aging treatment for 3000 hr in a high and low temperature damp heat test chamber at a temperature of 50 °C and a humidity of 95%, it can be seen from the experimental results that an airbag coating with very good aging resistance performance is obtained; the comparison results are shown in Table 1 below:

[0094] Table 1 Performance test results

[0095]

[0096]

[0097] As can be seen from Table 1, the anti-aging and anti-tearing airbag coating obtained in the above examples meets the safety requirements for the driver or occupant during the airbag explosion; compared with Comparative Examples 1-2, Example 2, and Examples 4-6, it can be seen that the tear strength and tensile strength of the anti-aging and anti-tearing airbag coating prepared in Example 2 before and after damp heat aging are better than those of Comparative Examples 1-2 and Examples 4-6; it is analyzed that vinyl-terminated polydimethylsiloxane, phenyl vinyl silicone oil, and hydrogen-containing silicone oil react to provide a conjugated crosslinking framework, enhancing the electron shielding effect between silicone oils in the system, reducing the interaction between different molecules, and enhancing the anti-aging performance of the material; the applicant found that when the phenyl content in the system is too large or too small, it will affect the overall mechanical properties of the coating material, resulting in affecting the overall stability of the crosslinking framework structure and the anti-tearing performance, and the anti-aging performance of the material is not ideal enough.

[0098] Comparing Example 2 with Comparative Example 3, it can be seen that the tear strength and tensile strength of the anti-aging and anti-tearing airbag coating prepared in Example 2 before and after damp heat aging are superior to those in Comparative Example 3. It is analyzed that with the addition of vinyl fluorosilicone oil, the fluorine-containing group in vinyl fluorosilicone oil is an electron-withdrawing group, and vinyl promotes the crosslinking density, enabling vinyl fluorosilicone oil to generate intermolecular interaction forces with the above crosslinking framework and embed or adhere to the surface of the crosslinked network system; fluorine-containing groups such as trifluoromethyl are claw-shaped and dispersed due to the steric effect between F and F, and the fluorine group and phenyl group are on different silane side chains, making part of the F atoms exposed on the surface of the crosslinked system and part dispersed between the benzene rings without being shielded by the steric effect of the benzene rings, thus giving full play to the hydrophobic and oleophobic properties of vinyl fluorosilicone oil and the anti-aging and stability of phenyl, increasing the crosslinking density of the system and improving the anti-tearing effect. In addition, it also improves the wear resistance, heat stability, oil resistance, corrosion resistance, etc. of the coating and extends the service life of the coating.

[0099] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application shall be covered within the protection scope of the present application.

Claims

1. An anti-aging and anti-tearing airbag coating, characterized in that: It consists of Component A and Component B. Component A is composed of the following components in parts by weight: 65 - 85 parts of vinyl silicone oil, 12 - 15 parts of silicone chain extender, 3 - 5.5 parts of silicone crosslinking agent, 0.05 - 0.1 part of inhibitor, and 2.5 - 3 parts of silane coupling agent; Component B is composed of the following components in parts by weight: 40 - 80 parts of vinyl fluorosilicone oil, 0.1 - 0.7 part of catalyst, 1.5 - 3 parts of tackifier, and 1 - 3 parts of antioxidant DW. The vinyl silicone oil in Component A includes vinyl-terminated polydimethylsiloxane and phenyl vinyl silicone oil. The mass ratio of vinyl-terminated polydimethylsiloxane to phenyl vinyl silicone oil is (5 - 8):

1. The vinyl fluorosilicone oil in Component B is end-vinyl fluorosilicone oil. The weight ratio of Component A to Component B is 1:

1. The silicone crosslinking agent is polymethylhydrosiloxane; the silicone chain extender is hydrogen-terminated polydimethylsiloxane.

2. The anti-aging and anti-tearing airbag coating according to claim 1, wherein: The inhibitor is diallyl maleate.

3. An anti-aging and anti-tearing airbag coating according to claim 1, characterized in that: The tackifier is isopropyl tris(dioctylpyrophosphate acyloxy) titanate.

4. The preparation method of an anti-aging and anti-tearing airbag coating according to any one of claims 1-3, characterized in that: It includes the following steps: (1) According to the formulation dosage of Component A, take vinyl silicone oil and silicone chain extender, stir and mix at 200 - 300 rpm for 10 - 20 min, then add silicone crosslinking agent, inhibitor, and silane coupling agent, and mix for another 10 - 15 min to prepare Component A. (2) According to the formulation dosage of Component B, sequentially add vinyl fluorosilicone oil, catalyst, tackifier, and antioxidant DW, and stir at 200 - 300 rpm for 20 - 30 min under normal pressure to prepare Component B. (3) Mix Component A and Component B evenly according to a weight ratio of 1:1 to obtain a coating solution, coat it on the surface of the substrate, and obtain an anti-aging and anti-tear airbag coating after curing treatment.

5. The preparation method of an anti-aging and anti-tearing airbag coating according to claim 4, characterized in that: The curing treatment is at a temperature of 160 - 180 °C and a curing time of 1 - 3 min.

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