Self-adhesive liquid silicone rubber for bonding cloth and molded silica gel and preparation method of self-adhesive liquid silicone rubber

Abstract

The invention relates to the technical field of silicone rubber, and particularly discloses self-adhesive liquid silicone rubber for bonding cloth and molded silica gel and a preparation method. The self-adhesive liquid silicone rubber is prepared from a component A and a component B, wherein the component A is mainly prepared from the following raw materials in parts by weight: 30-50 parts of methyl vinyl organic silicon resin, 0.1-1 part of a platinum catalyst and 0-2 parts of a tackifier; the component B is mainly prepared from the following raw materials in parts by weight: 30-50 parts of methyl vinyl organic silicon resin, 0.6-4 parts of a tackifier, 0.5-2.5 parts of hydrogen-containing silicone oil and 0.1-0.3 part of an inhibitor; the tackifier in the component A and the tackifier in the component B are respectively one or two of the tackifier A and the tackifier B. The self-adhesive liquid silicone rubber is very tight in cloth adhesion, after 28-day standing treatment and 180-degree stripping, cohesive failure of cloth can be achieved, the adhesion effect is tight and lasting, and market requirements are met.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of silicone rubber, more particularly, it relates to a self-adhesive liquid silicone rubber for bonding cloth and shaped silicone and a preparation method. BACKGROUND

[0002] Leather is commonly used in the fields of automotive interiors, medical devices, furniture and home decoration, footwear and accessories, and occupies an important position. Leather is mainly divided into three types, namely PVC leather, PU leather and silicone leather. Due to the advantages of silicone leather such as strong anti-wrinkle, good stain resistance, excellent light aging resistance, good solvent resistance, good hydrolysis resistance, low odor and strong flame resistance, it has been widely used. Silicone leather is divided into silicone rubber synthetic leather and silicone resin synthetic leather, and mainly silicone rubber synthetic leather, which accounts for about 80% of the market share.

[0003] In order to improve the appearance and durability of leather, non-woven fabric is often provided on the outer surface of leather, and the connection between non-woven fabric and leather is usually achieved by using glue. At present, a kind of environment-friendly adhesive for bonding artificial leather smooth surface is reported in China, which comprises component A and component B, and the raw materials of component A include liquid polyester polyol, aromatic isocyanate, low odor environment-friendly solvent and dibutyltin dilaurate catalyst; the raw materials of component B include polyisocyanate. The environment-friendly adhesive is applied to the surface of non-woven fabric, and after 1d of standing treatment, when 180 degree peeling is performed, the base material can be damaged, but after 7d of standing treatment, when 180 degree peeling is performed, the base material is partially separated, the bonding effect is weakened, that is, the bonding durability is poor, which needs to be further improved. SUMMARY

[0004] In order to improve the bonding durability, the present application provides a self-adhesive liquid silicone rubber for bonding cloth and shaped silicone and a preparation method.

[0005] In the first aspect, the present application provides a self-adhesive liquid silicone rubber for bonding cloth and shaped silicone, which adopts the following technical scheme: A self-adhesive liquid silicone rubber for bonding cloth and shaped silicone, the self-adhesive liquid silicone rubber is made of component A and component B, and the weight ratio of the component A to the component B is 1:(0.5-2); The component A is mainly made of the following raw materials by weight: methyl vinyl silicone resin 30-50 parts, platinum catalyst 0.1-1 part, tackifier 0-2 parts; the component B is mainly made of the following raw materials by weight: methyl vinyl silicone resin 30-50 parts, tackifier 0.6-4 parts, hydrogen-containing silicone oil 0.5-2.5 parts, inhibitor 0.1-0.3 parts; The tackifier in the A component is one or both of tackifier A and tackifier B; the tackifier in the B component is one or both of tackifier A and tackifier B; The tackifier A is prepared by addition reaction of monomer A1 and monomer A2; the monomer A1 is one or more of bisphenol A glyceryl dimethyl acrylate, bisphenol A epoxy acrylate, and diallyl bisphenol A diglycidyl ether; the monomer A2 is one or both of hydrogen-containing silicone oil and 1,3,5,7-tetramethylcyclotetrasiloxane; The tackifier B is prepared by addition reaction of monomer B1 and monomer B2; the monomer B1 is one or both of 2-vinyl-4,6-dialkoxy-1,3,5-triazine and 2-vinyl-4,6-diamino-1,3,5-triazine; the monomer B2 is one or both of hydrogen-containing silicone oil and 1,3,5,7-tetramethylcyclotetrasiloxane.

[0006] The self-adhesive liquid silicone rubber of the application is capable of causing the methyl vinyl silicone resin and the hydrogen-containing silicone oil to undergo a silicon-hydrogen addition reaction under a platinum catalyst and form a compact network structure. Moreover, the tackifier is added to the B component to effectively increase the bonding strength and bonding durability of the self-adhesive liquid silicone rubber and the fabric, and after 28 days of standing treatment, the fabric can be subjected to cohesive failure when peeled at 180 degrees, thereby exhibiting the advantages of good bonding effect and long bonding durability and meeting market demand.

[0007] Optionally, the tackifier A is mainly prepared from the following raw materials by weight: organic solvent 35-100 parts, monomer A1 40-60 parts, monomer A2 40-60 parts, inhibitor 0.01-0.05 parts, and platinum catalyst 0.01-1 part.

[0008] By optimizing the raw materials and the raw material ratio of the tackifier A, the monomer A1 and the monomer A2 are facilitated to react, the tackifier A is ensured to have good viscosity, the use effect of the tackifier A is increased, and the bonding effect of the self-adhesive liquid silicone rubber is improved.

[0009] Optionally, the tackifier A is prepared by the following method: The organic solvent, the monomer A1, the inhibitor, and the platinum catalyst are mixed, heated to 70-90°C, the monomer A2 is added, and the mixture is subjected to heat preservation treatment for 3-5 hours, cooled to room temperature, the platinum catalyst is removed, and low-boiling substances are removed under vacuum to obtain the tackifier A.

[0010] By adopting the above technical solution, the preparation of the tackifier A is facilitated.

[0011] Optionally, in the preparation of the tackifier A, the organic solvent is one or more of toluene, xylene, ethyl acetate, butyl acetate; the inhibitor is one or more of 1-ethynyl-1-cyclohexanol, dibenzoyl peroxide, 2-methyl-3-butynyl-2-alcohol; the platinum-gold catalyst is a platinum-gold catalyst solvent body, the concentration of the catalyst in the platinum-gold catalyst solvent body is 4000-5000 ppm, the solvent in the platinum-gold catalyst solvent body is dimethyl silicone oil, the viscosity of the dimethyl silicone oil at 25°C is 50-100 mPa.s; the catalyst in the platinum-gold catalyst is one or more of chloroplatinic acid, chloroplatinic acid-divinyltetramethyldisiloxane complex, chloroplatinic acid-divinylhexamethyltetrasiloxane complex.

[0012] Optionally, the tackifier B is mainly prepared from the following raw materials by weight: 35-100 parts of the organic solvent, 140-60 parts of the monomer B1, 40-60 parts of the monomer B2, 0.01-0.05 parts of the inhibitor, and 0.01-1 part of the platinum-gold catalyst.

[0013] By optimizing the raw materials and the raw material ratio of the tackifier B, the reaction of the monomer B1 and the monomer B2 is facilitated, the tackifier B has good viscosity, the use effect of the tackifier B is increased, and the bonding effect of the self-adhesive liquid silicone rubber is improved.

[0014] Optionally, the tackifier B is prepared by the following method: The organic solvent, the monomer B1, the inhibitor, and the platinum-gold catalyst are mixed, heated to 70-90°C, the monomer B2 is added, heat treated for 3-5 h, cooled to room temperature, the platinum-gold catalyst is removed, and low-boiling substances are removed under vacuum to obtain the tackifier B.

[0015] By adopting the above technical solution, the preparation of the tackifier B is facilitated.

[0016] Optionally, in the preparation of the tackifier B, the organic solvent is one or more of toluene, xylene, ethyl acetate, butyl acetate; the inhibitor is one or more of 1-ethynyl-1-cyclohexanol, dibenzoyl peroxide, 2-methyl-3-butynyl-2-alcohol; the platinum-gold catalyst is a platinum-gold catalyst solvent body, the concentration of the catalyst in the platinum-gold catalyst solvent body is 4000-5000 ppm, the solvent in the platinum-gold catalyst solvent body is dimethyl silicone oil, the viscosity of the dimethyl silicone oil at 25°C is 50-100 mPa.s; the catalyst in the platinum-gold catalyst is one or more of chloroplatinic acid, chloroplatinic acid-divinyltetramethyldisiloxane complex, chloroplatinic acid-divinylhexamethyltetrasiloxane complex.

[0017] Optionally, the 2-vinyl-4,6-dialkoxy-1,3,5-triazine is one or both of 2-vinyl-4,6-diethoxy-1,3,5-triazine and 2-vinyl-4,6-dimethoxy-1,3,5-triazine.

[0018] Optionally, in the raw material of the tackifier A, the hydrogen-containing silicone oil has a viscosity of 10-1000 mPa.s at 25℃ and a hydrogen content of 0.75-1.6 wt%.

[0019] Optionally, in the raw material of the tackifier B, the hydrogen-containing silicone oil has a viscosity of 10-1000 mPa.s at 25℃ and a hydrogen content of 0.75-1.6 wt%.

[0020] Optionally, the methyl vinyl silicone resin is made from the following raw materials by weight: methyl-terminated vinyl polysiloxane 5-20 parts, double-end vinyl polysiloxane 20-50 parts, fumed white carbon black 20-40 parts, vinyl MQ resin 10-20 parts, dimethyl silicone oil 2-10 parts, and hexamethyl disilazane 1-5 parts.

[0021] By optimizing the raw materials and the raw material ratio of the methyl vinyl silicone resin, the quality and use effect of the methyl vinyl silicone resin are ensured, and the adhesive layer formed by the self-adhesive liquid silicone rubber has good hardness, strength, and elasticity.

[0022] Optionally, the methyl vinyl silicone resin is prepared by the following method: The methyl-terminated vinyl polysiloxane, double-end vinyl polysiloxane, fumed white carbon black, vinyl MQ resin, dimethyl silicone oil, and hexamethyl disilazane are mixed, kneaded for 4-6 h, vacuumed and kneaded for 1-3 h at a temperature of 170-190℃, and cooled to room temperature to obtain the methyl vinyl silicone resin.

[0023] By adopting the above technical solution, the preparation of the methyl vinyl silicone resin is facilitated.

[0024] Optionally, in the raw material of the methyl vinyl silicone resin, the methyl-terminated vinyl polysiloxane has a viscosity of 1000-20000 mPa.s at 25℃ and a vinyl content of 0.12-0.4 wt%. The double-end vinyl polysiloxane has a viscosity of 100000-400000 mPa.s at 25℃ and a vinyl content of 0.1-0.32 wt%. The fumed white carbon black has a specific surface area of 320-380 m 2 / g. The vinyl MQ resin has a viscosity of 5000-50000 mPa.s at 25℃ and a vinyl content of 1.5-2.5 wt%. The dimethyl silicone oil has a viscosity of 50-100 mPa.s at 25℃.

[0025] Optionally, in the raw material of the B component, the viscosity of the hydrogen-containing silicone oil at 25°C is 10-1000 mPa.s, and the hydrogen content is 0.75-1.6 wt%.

[0026] Optionally, in the raw material of the B component, the inhibitor is one or more of 1-ethynyl-1-cyclohexanol, dibenzoyl peroxide, and 2-methyl-3-butynyl-2-alcohol.

[0027] Optionally, in the raw material of the A component, the platinum-gold catalyst is a platinum-gold catalyst solvent body, the concentration of the catalyst in the platinum-gold catalyst solvent body is 4000-5000 ppm, the solvent in the platinum-gold catalyst solvent body is dimethyl silicone oil, and the viscosity of the dimethyl silicone oil at 25°C is 50-100 mPa.s. The catalyst in the platinum-gold catalyst is one or more of chloroplatinic acid, chloroplatinic acid-divinyltetramethyldisiloxane complex, and chloroplatinic acid-divinylhexamethyltetrasiloxane complex.

[0028] By adopting the above technical solution, the platinum-gold catalyst in the A component is optimized, which facilitates the selection of the platinum-gold catalyst. Moreover, the platinum-gold catalyst can reduce the reaction activation energy, initiate and promote the silicon-hydrogen addition reaction. Meanwhile, the platinum-gold catalyst adopts a platinum-gold catalyst solvent body, which enables the catalyst to be fully dispersed in the self-adhesive liquid silicone rubber raw material, thereby ensuring the quality and use effect of the self-adhesive liquid silicone rubber.

[0029] In a second aspect, the application provides a preparation method of the self-adhesive liquid silicone rubber for bonding cloth and forming silicone rubber, which adopts the following technical solution: The preparation method of the self-adhesive liquid silicone rubber for bonding cloth and forming silicone rubber comprises the following steps: Mixing the methyl vinyl silicone resin, the platinum-gold catalyst, and the tackifier to obtain the A component; Mixing the methyl vinyl silicone resin, the tackifier, the hydrogen-containing silicone oil, and the inhibitor to obtain the B component; Mixing the A component and the B component to obtain the self-adhesive liquid silicone rubber.

[0030] By adopting the above technical solution, the preparation of the self-adhesive liquid silicone rubber is facilitated.

[0031] In summary, the application has at least the following beneficial effects: The self-adhesive liquid silicone rubber for bonding cloth and forming silicone rubber of the application can undergo a silicon-hydrogen addition reaction under the platinum-gold catalyst to form a compact network structure. On this basis, the self-adhesive liquid silicone rubber obtained by adding the tackifier is very compact for bonding cloth, and after 28 days of standing treatment, the cohesive failure of the cloth can be achieved when peeled at 180 degrees, the bonding effect is compact and durable, and the market demand is met. DETAILED DESCRIPTION

[0032] In order to make the present application more readily understood, reference is made to the following examples, which are intended to be illustrative only and not limiting of the scope of the application. Unless otherwise defined, the materials and components used in the present application are commercially available or are readily prepared by conventional methods.

[0033] Preparation Example Preparation Example I-1 A methyl vinyl silicone resin is prepared from the following raw materials: methyl-terminated vinyl polysiloxane 12 g, both-end vinyl polysiloxane 50 g, fumed silica 20 g, vinyl MQ resin 10 g, dimethyl silicone oil 10 g, hexamethyldisilazane 4 g.

[0034] The methyl-terminated vinyl polysiloxane has a viscosity of 20000 mPa.s at 25°C and a vinyl content of 0.12 wt%; the both-end vinyl polysiloxane has a viscosity of 200000 mPa.s at 25°C and a vinyl content of 0.24 wt%; the fumed silica has a specific surface area of 330 m 2 / g; the vinyl MQ resin has a viscosity of 15000 mPa.s at 25°C and a vinyl content of 1.8 wt%; the dimethyl silicone oil has a viscosity of 50 mPa.s at 25°C.

[0035] A method for preparing a methyl vinyl silicone resin, comprising the following steps: Methyl-terminated vinyl polysiloxane, both-end vinyl polysiloxane, fumed silica, vinyl MQ resin, dimethyl silicone oil, hexamethyldisilazane are mixed in a reactor, and kneaded for 5 h. Then vacuum is applied and kneading is performed for 3 h at a temperature of 180°C. After cooling to 25°C, a methyl vinyl silicone resin is obtained.

[0036] Preparation Example I-2 An adhesion promoter A differs from the preparation example II-1 in that the raw materials of the methyl vinyl silicone resin are different in ratio, and the methyl vinyl silicone resin is prepared from the following raw materials: methyl-terminated vinyl polysiloxane 5 g, both-end vinyl polysiloxane 50 g, fumed silica 40 g, vinyl MQ resin 20 g, dimethyl silicone oil 10 g, hexamethyldisilazane 5 g.

[0037] Preparation Example I-3 An adhesion promoter A, which is different from Preparation Example II-1 in that the raw material ratio of the methyl vinyl silicone resin is different, and the methyl vinyl silicone resin is mainly made from the following raw materials: methyl-terminated vinyl polysiloxane 20 g, double-terminated vinyl polysiloxane 20 g, fumed white carbon black 20 g, vinyl MQ resin 20 g, dimethyl silicone oil 2 g, hexamethyldisilazane 1 g.

[0038] Preparation Example I-4 An adhesion promoter A, which is different from Preparation Example II-1 in that the raw material ratio of the methyl vinyl silicone resin is different, and the methyl vinyl silicone resin is mainly made from the following raw materials: methyl-terminated vinyl polysiloxane 20 g, double-terminated vinyl polysiloxane 20 g, fumed white carbon black 20 g, vinyl MQ resin 20 g, dimethyl silicone oil 2 g, hexamethyldisilazane 1 g.

[0039] Preparation Example I-5 An adhesion promoter A, which is different from Preparation Example II-1 in that the raw material ratio of the methyl vinyl silicone resin is different, and the methyl vinyl silicone resin is mainly made from the following raw materials: methyl-terminated vinyl polysiloxane 20 g, double-terminated vinyl polysiloxane 20 g, fumed white carbon black 20 g, vinyl MQ resin 20 g, dimethyl silicone oil 2 g, hexamethyldisilazane 1 g.

[0040] Preparation Example II-1 An adhesion promoter A, which is mainly made from the following raw materials: organic solvent 45 g, monomer A1 50 g, monomer A2 55 g, inhibitor 0.03 g, platinum gold catalyst 0.05 g.

[0041] The organic solvent is toluene; the monomer A1 is bisphenol A glyceryl dimethyl acrylate; the monomer A2 is hydrogen-containing silicone oil, the 25℃ viscosity of the hydrogen-containing silicone oil is 10 mPa.s, and the hydrogen content is 1.6wt%; the inhibitor is 1-ethynyl-1-cyclohexanol; and the platinum gold catalyst is a platinum gold catalyst solvent body, the concentration of the catalyst in the platinum gold catalyst solvent body is 4000 ppm, the solvent in the platinum gold catalyst solvent body is dimethyl silicone oil, the 25℃ viscosity of the dimethyl silicone oil is 50 mPa.s, and the catalyst in the platinum gold catalyst is chloroplatinic acid-divinyltetramethyldisiloxane complex.

[0042] A preparation method of an adhesion promoter A, comprising the following steps: The organic solvent, the monomer A1, the inhibitor, and the platinum gold catalyst are added into a reactor, and stirred for 5 min. Then the temperature is raised to 70℃, the monomer A2 is added, and the temperature is kept for 4 h. Then the temperature is lowered to 25℃, and the platinum gold catalyst is removed. Then the low boiling point substances are removed by vacuum extraction at a temperature of 100℃, and the adhesion promoter A is obtained.

[0043] In the platinum catalyst removal process, the following method is used: add activated carbon, stir for 30 min, stand for 2 h, filter, and complete the platinum catalyst removal process.

[0044] The amount of activated carbon used is 100 times the total weight of the platinum catalyst.

[0045] Preparation Example II-2 An adhesion promoter A differs from Preparation Example II-1 in that the monomer A1 in the raw materials of the adhesion promoter A is different, and the monomer A1 is bisphenol A epoxy acrylate.

[0046] Preparation Example II-3 An adhesion promoter A differs from Preparation Example II-1 in that the monomer A1 in the raw materials of the adhesion promoter A is different, and the monomer A1 is diallyl bisphenol A diglycidyl ether.

[0047] Preparation Example II-4 An adhesion promoter A differs from Preparation Example II-1 in that the monomer A1 in the raw materials of the adhesion promoter A is different, and the monomer A1 is bisphenol A glycerol dimethyl acrylate and bisphenol A epoxy acrylate, and the weight ratio of bisphenol A glycerol dimethyl acrylate and bisphenol A epoxy acrylate is 1:1.

[0048] Preparation Example II-5 An adhesion promoter A differs from Preparation Example II-1 in that the monomer A2 in the raw materials of the adhesion promoter A is different, and the monomer A2 is 1,3,5,7-tetramethylcyclotetrasiloxane.

[0049] Preparation Example III-1 An adhesion promoter B is mainly made from the following raw materials: organic solvent 45 g, monomer B1 50 g, monomer B2 55 g, inhibitor 0.03 g, platinum catalyst 0.05 g.

[0050] The organic solvent is toluene; the monomer B1 is 2-vinyl-4,6-diethoxy-1,3,5-triazine; the monomer B2 is hydrogen-containing silicone oil, the 25℃ viscosity of the hydrogen-containing silicone oil is 10 mPa.s, and the hydrogen content is 1.6wt%; the inhibitor is 1-ethynyl-1-cyclohexanol; and the platinum catalyst is a platinum catalyst solvent body, the concentration of the catalyst in the platinum catalyst solvent body is 4000 ppm, the solvent in the platinum catalyst solvent body is dimethyl silicone oil, the 25℃ viscosity of the dimethyl silicone oil is 50 mPa.s, and the catalyst in the platinum catalyst is chloroplatinic acid-divinyltetramethyldisiloxane complex.

[0051] A preparation method of an adhesion promoter B, comprising the following steps: The organic solvent, monomer B1, inhibitor, platinum-gold catalyst are added into the reactor, and stirred for 5 min. Then, the temperature is raised to 70℃, and monomer B2 is added, and incubated for 4 h. Then, the temperature is lowered to 25℃, and the platinum-gold catalyst is removed. Then, the low boiling point substances are removed by vacuum at a temperature of 100℃, and the tackifier B is obtained.

[0052] In the process of removing the platinum-gold catalyst, the following method is used: adding activated carbon, stirring for 30 min, standing for 2 h, filtering, and completing the process of removing the platinum-gold catalyst.

[0053] The amount of activated carbon used is 100 times the total weight of platinum-gold catalyst.

[0054] Preparation Example III-2 A tackifier B, which is different from Preparation Example III-1, is prepared by using 1,3,5,7-tetramethylcyclotetrasiloxane as monomer B2. Example

[0055] Example 1 A self-adhesive liquid silicone rubber for bonding fabric and shaped silica gel is prepared from A component and B component, and the weight ratio of A component to B component is 1:1.

[0056] The A component is mainly prepared from the following raw materials: methyl vinyl silicone resin 50 g, platinum-gold catalyst 0.5 g. The B component is mainly prepared from the following raw materials: methyl vinyl silicone resin 48.5 g, tackifier 1 g, hydrogen-containing silicone oil 1.9 g, inhibitor 0.1 g.

[0057] In the A component, the platinum-gold catalyst is a platinum-gold catalyst solvent, the concentration of the catalyst in the platinum-gold catalyst solvent is 4000 ppm, the solvent in the platinum-gold catalyst solvent is dimethyl silicone oil, the 25℃ viscosity of the dimethyl silicone oil is 50 mPa.s, and the catalyst in the platinum-gold catalyst is chloroplatinic acid-divinyltetramethyldisiloxane complex; the methyl vinyl silicone resin is prepared by the method of Preparation Example I-1. In the B component, the inhibitor is 1-ethynyl-1-cyclohexanol; the 25℃ viscosity of the hydrogen-containing silicone oil is 100 mPa.s, and the hydrogen content is 1.2 wt%; the methyl vinyl silicone resin is prepared by the method of Preparation Example I-1; and the tackifier is tackifier A, which is prepared by the method of Preparation Example II-1.

[0058] A method for preparing a self-adhesive liquid silicone rubber for bonding fabric and shaped silica gel, comprising the following steps: Mixing methyl vinyl silicone resin, platinum-gold catalyst, and tackifier to obtain A component.

[0059] The methyl vinyl silicone resin, the tackifier, the hydrogen-containing silicone oil, and the inhibitor are mixed to obtain the component B.

[0060] The component A and the component B are mixed to obtain the self-adhesive liquid silicone rubber.

[0061] Example 2 A self-adhesive liquid silicone rubber for bonding cloth and shaped silica gel, which differs from Example 1 in that the raw materials of the self-adhesive liquid silicone rubber, the raw materials of the component B, the tackifier is different, the tackifier is tackifier B, and tackifier B is prepared by the method of Preparation III-1.

[0062] Example 3 A self-adhesive liquid silicone rubber for bonding cloth and shaped silica gel, which differs from Example 1 in that the raw materials of the self-adhesive liquid silicone rubber, the raw materials of the component B, the tackifier is different, the tackifier is tackifier A and tackifier B, and the weight ratio of tackifier A and tackifier B is 1:1, tackifier A is prepared by the method of Preparation II-1; tackifier B is prepared by the method of Preparation III-1.

[0063] Example 4 A self-adhesive liquid silicone rubber for bonding cloth and shaped silica gel, which differs from Example 1 in that the raw materials of the self-adhesive liquid silicone rubber, the raw materials of the component A, the raw material ratio is different.

[0064] The component A is mainly made of the following raw materials: methyl vinyl silicone resin 50g, platinum gold catalyst 0.5g, tackifier 1g. In the component A, the tackifier is tackifier A, and tackifier A is prepared by the method of Preparation II-1.

[0065] Example 5 A self-adhesive liquid silicone rubber for bonding cloth and shaped silica gel, which differs from Example 4 in that the raw materials of the self-adhesive liquid silicone rubber, the raw materials of the component B, the tackifier is different, the tackifier is tackifier A and tackifier B, and the weight ratio of tackifier A and tackifier B is 1:1, tackifier A is prepared by the method of Preparation II-1; tackifier B is prepared by the method of Preparation III-1.

[0066] Example 6 A self-adhesive liquid silicone rubber for bonding cloth and shaped silica gel, which differs from Example 1 in that, in the raw materials of the self-adhesive liquid silicone rubber, the raw materials of Component A, the methyl vinyl silicone resin is different, and the methyl vinyl silicone resin is prepared by the method of Preparation Example I-2. In the raw materials of Component B, the methyl vinyl silicone resin and the adhesion promoter are different, the methyl vinyl silicone resin is prepared by the method of Preparation Example I-2; the adhesion promoter is Adhesion Promoter A, and Adhesion Promoter A is prepared by the method of Preparation Example II-2.

[0067] Example 7 A self-adhesive liquid silicone rubber for bonding cloth and shaped silica gel, which differs from Example 1 in that, in the raw materials of the self-adhesive liquid silicone rubber, the raw materials of Component A, the methyl vinyl silicone resin is different, and the methyl vinyl silicone resin is prepared by the method of Preparation Example I-3. In the raw materials of Component B, the methyl vinyl silicone resin and the adhesion promoter are different, the methyl vinyl silicone resin is prepared by the method of Preparation Example I-3; the adhesion promoter is Adhesion Promoter A, and Adhesion Promoter A is prepared by the method of Preparation Example II-3.

[0068] Example 8 A self-adhesive liquid silicone rubber for bonding cloth and shaped silica gel, which differs from Example 1 in that, in the raw materials of the self-adhesive liquid silicone rubber, the raw materials of Component A, the methyl vinyl silicone resin is different, and the methyl vinyl silicone resin is prepared by the method of Preparation Example I-4. In the raw materials of Component B, the methyl vinyl silicone resin and the adhesion promoter are different, the methyl vinyl silicone resin is prepared by the method of Preparation Example I-4; the adhesion promoter is Adhesion Promoter A, and Adhesion Promoter A is prepared by the method of Preparation Example II-4.

[0069] Example 9 A self-adhesive liquid silicone rubber for bonding cloth and shaped silica gel, which differs from Example 1 in that, in the raw materials of the self-adhesive liquid silicone rubber, the raw materials of Component A, the methyl vinyl silicone resin is different, and the methyl vinyl silicone resin is prepared by the method of Preparation Example I-5. In the raw materials of Component B, the methyl vinyl silicone resin and the adhesion promoter are different, the methyl vinyl silicone resin is prepared by the method of Preparation Example I-5; the adhesion promoter is Adhesion Promoter A, and Adhesion Promoter A is prepared by the method of Preparation Example II-5.

[0070] Example 10 A self-adhesive liquid silicone rubber for bonding cloth and shaped silica gel, which differs from Example 1 in that, in the raw materials of the self-adhesive liquid silicone rubber, the raw materials of Component B, the adhesion promoter is different, and the adhesion promoter is Adhesion Promoter B, which is prepared by the method of Preparation Example III-2.

[0071] Example 11 A self-adhesive liquid silicone rubber for bonding cloth and shaped silica gel, which differs from Example 1 in that the raw material ratio of the A component and the B component in the self-adhesive liquid silicone rubber is different.

[0072] The A component is mainly made of the following raw materials: methyl vinyl silicone resin 30 g, platinum gold catalyst 0.1 g. The B component is mainly made of the following raw materials: methyl vinyl silicone resin 50 g, tackifier 4 g, hydrogen-containing silicone oil 2.5 g, inhibitor 0.1 g.

[0073] Example 12 A self-adhesive liquid silicone rubber for bonding cloth and shaped silica gel, which differs from Example 1 in that the raw material ratio of the A component and the B component in the self-adhesive liquid silicone rubber is different.

[0074] The A component is mainly made of the following raw materials: methyl vinyl silicone resin 50 g, platinum gold catalyst 1 g. The B component is mainly made of the following raw materials: methyl vinyl silicone resin 30 g, tackifier 0.6 g, hydrogen-containing silicone oil 0.5 g, inhibitor 0.3 g.

[0075] Comparative Example Comparative Example 1 A self-adhesive liquid silicone rubber for bonding cloth and shaped silica gel, which differs from Example 1 in that the raw material ratio of the B component in the self-adhesive liquid silicone rubber is different.

[0076] The B component is mainly made of the following raw materials: methyl vinyl silicone resin 48.5 g, tackifier 0.4 g, hydrogen-containing silicone oil 1.9 g, inhibitor 0.1 g.

[0077] Comparative Example 2 A self-adhesive liquid silicone rubber for bonding cloth and shaped silica gel, which differs from Example 1 in that the raw material ratio of the B component in the self-adhesive liquid silicone rubber is different, and the tackifier in the B component is different.

[0078] The B component is mainly made of the following raw materials: methyl vinyl silicone resin 48.5 g, tackifier 0.4 g, hydrogen-containing silicone oil 1.9 g, inhibitor 0.1 g.

[0079] The tackifier in the B component is two kinds of tackifier A and tackifier B, and the weight ratio of tackifier A and tackifier B is 1:1. Tackifier A is prepared by the method of Preparation Example II-1; tackifier B is prepared by the method of Preparation Example III-1.

[0080] Comparative Example 3 A self-adhesive liquid silicone rubber for bonding cloth and shaped silica gel, which is different from example 1 in that the tackifier in the B component of the raw materials of the self-adhesive liquid silicone rubber is different. The tackifier is silane coupling agent KH560.

[0081] Comparative example 4 A self-adhesive liquid silicone rubber for bonding cloth and shaped silica gel, which is different from example 1 in that the tackifier in the B component of the raw materials of the self-adhesive liquid silicone rubber is different. The tackifier is silane coupling agent KH560, silane coupling agent KH570, and the weight ratio of silane coupling agent KH560 and silane coupling agent KH570 is 1:1.

[0082] Comparative example 5 A self-adhesive liquid silicone rubber for bonding cloth and shaped silica gel, which is different from example 1 in that the tackifier in the B component of the raw materials of the self-adhesive liquid silicone rubber is different. The tackifier is tackifier C.

[0083] Tackifier C, which is mainly made of the following raw materials: organic solvent 45g, allyl glycidyl ether 30g, 3-(2,3-epoxypropoxy) propyl trimethoxysilane 20g, hydrogen-containing silicone oil 55g, inhibitor 0.03g, platinum gold catalyst 0.05g.

[0084] Among them, the organic solvent is toluene; the hydrogen-containing silicone oil has a viscosity of 10 mPa.s at 25℃ and a hydrogen content of 1.6wt%; the inhibitor is 1-ethynyl-1-cyclohexanol; the platinum gold catalyst is a platinum gold catalyst solvent, the concentration of the catalyst in the platinum gold catalyst solvent is 4000ppm, the solvent in the platinum gold catalyst solvent is dimethyl silicone oil, the viscosity of the dimethyl silicone oil is 50 mPa.s at 25℃, and the catalyst in the platinum gold catalyst is chloroplatinic acid-divinyltetramethyldisiloxane complex.

[0085] A method for preparing tackifier C, comprising the following steps: In the reactor, add organic solvent, allyl glycidyl ether, 3-(2,3-epoxypropoxy) propyl trimethoxysilane, inhibitor, platinum gold catalyst, and stir for 5min. Then heat to 70℃, add hydrogen-containing silicone oil, and incubate for 4h. Then cool to 25℃, remove the platinum gold catalyst. Then remove the low-boiling substances under vacuum at a temperature of 100℃ to obtain tackifier A.

[0086] Among them, in the treatment of removing the platinum gold catalyst, the following method is used: add activated carbon, stir for 30min, stand for 2h, filter, and complete the treatment of removing the platinum gold catalyst.

[0087] And, the amount of activated carbon used is 100 times the total weight of the platinum gold catalyst.

[0088] Performance test The self-adhesive liquid silicone rubber obtained from Examples 1-12 and Comparative Examples 1-5 was coated on the surface of a cloth, and the cloth was selected as a non-woven fabric. Then, the temperature was raised to 120°C, and the self-adhesive liquid silicone rubber was heat-pressed for 10 min. The self-adhesive liquid silicone rubber was cured to form a glue layer with a thickness of 100 μm, and a sample was obtained. The sample was left to stand for 28 days, and the glue layer on the surface of the sample was subjected to 180-degree peeling test under different standing times. The peeling condition was observed, and the detection results are shown in Table 1.

[0089] Coherent destruction indicates that the cloth is subjected to coherent destruction during 180-degree peeling, that is, the glue layer and the cloth are closely attached, and the adhesion effect is good. Partial separation indicates that the glue layer and the cloth are partially separated during 180-degree peeling, that is, the glue layer and the cloth are not well attached, and the adhesion effect is poor.

[0090] Table 1 detection results As can be seen from Table 1, the self-adhesive liquid silicone rubber obtained in the application is applied to the cloth, and after standing for 28 days, the cloth can be subjected to coherent destruction during 180-degree peeling, and has a better adhesion effect, that is, the adhesion effect is close and durable, and meets the market demand.

[0091] Comparing Example 1 with Comparative Examples 1-2. The tackifier of the B component of Comparative Example 1 is tackifier A, and the addition amount is 0.4 parts. The tackifier of the B component of Comparative Example 2 is tackifier A and tackifier B, and the addition amount of tackifier A is 0.2 parts, and the addition amount of tackifier B is 0.2 parts. The tackifier of the B component of Example 1 is tackifier A, and the addition amount is 0.1 part. As can be seen, when the addition amount of the tackifier is too small, the glue layer and the cloth are partially separated during 180-degree peeling after standing for 1 h, indicating that the self-adhesive liquid silicone rubber of Comparative Examples 1 and 2 has a certain adhesion effect on the cloth, but the adhesion strength is obviously insufficient, thereby causing partial separation. That is, the addition amount of the tackifier is too small, which affects the bonding strength, and when the addition amount of the tackifier is selected in the range of 0.6-4 parts, the adhesion strength is good, and the desired effect can be achieved.

[0092] Comparing Example 1, Example 2 and Comparative Examples 3-5. The adhesion promoter of the B component of Comparative Example 3 is silane coupling agent KH560; the adhesion promoter of the B component of Comparative Example 4 is silane coupling agent KH560 and silane coupling agent KH570; the adhesion promoter of the B component of Comparative Example 5 is adhesion promoter C; the adhesion promoter of the B component of Example 1 is adhesion promoter A; the adhesion promoter of the B component of Example 1 is adhesion promoter B. It can be seen that the self-adhesive liquid silicone rubber obtained by adding silane coupling agent KH560, silane coupling agent KH570 and adhesion promoter C is applied to the cloth, and after 1d standing treatment, when 180 degree peeling is performed, the cohesive failure of the cloth can be achieved, but after 7d standing treatment, when 180 degree peeling is performed, partial separation of the glue layer and the cloth occurs, and the bonding effect is weakened, which may be due to the partial failure of silane coupling agent KH560, silane coupling agent KH570 and adhesion promoter C. The self-adhesive liquid silicone rubber obtained by adhesion promoter A and adhesion promoter B can be applied to the cloth, and after 28d standing treatment, when 180 degree peeling is performed, the cohesive failure of the cloth can still be achieved, and good bonding effect is maintained.

[0093] It should be noted that the above-described examples are only used to explain the present application and do not constitute any limitation on the present application. The present application is described by referring to typical examples, but it should be understood that the words used therein are descriptive and explanatory words, rather than limiting words. The present application can be modified within the scope of the claims, and the present application can be revised without departing from the scope and spirit of the present application. Although the present application described therein relates to specific methods, materials and examples, it does not mean that the present application is limited to the specific examples disclosed therein, on the contrary, the present application can be extended to all other methods and applications with the same function.

Claims

1. A self-adhesive liquid silicone rubber for bonding fabric and molding silicone, characterized in that: The self-adhesive liquid silicone rubber is made of component A and component B, and the weight ratio of component A to component B is 1:(0.5-2). Component A is mainly composed of the following raw materials in parts by weight: 30-50 parts methyl vinyl silicone resin, 0.1-1 parts platinum catalyst, and 0-2 parts tackifier; Component B is mainly composed of the following raw materials in parts by weight: 30-50 parts methyl vinyl silicone resin, 0.6-4 parts tackifier, 0.5-2.5 parts hydrogen-containing silicone oil, and 0.1-0.3 parts inhibitor. The tackifier in component A is one or both of tackifier A and tackifier B; the tackifier in component B is one or both of tackifier A and tackifier B. The tackifier A is prepared by an addition reaction of monomers A1 and A2; monomer A1 is one or more of bisphenol A glycerol dimethacrylate, bisphenol A epoxy acrylate, and diallyl bisphenol A diglycidyl ether; monomer A2 is one or two of hydrogen-containing silicone oil and 1,3,5,7-tetramethylcyclotetrasiloxane. The tackifier B is prepared by an addition reaction of monomers B1 and B2; monomer B1 is one or both of 2-vinyl-4,6-dialkoxy-1,3,5-triazine and 2-vinyl-4,6-diamino-1,3,5-triazine; monomer B2 is one or both of hydrogen-containing silicone oil and 1,3,5,7-tetramethylcyclotetrasiloxane.

2. The self-adhesive liquid silicone rubber for bonding fabric and molding silicone according to claim 1, characterized in that: The thickener A is mainly made from the following raw materials in parts by weight: 35-100 parts organic solvent, 40-60 parts monomer A1, 40-60 parts monomer A2, 0.01-0.05 parts inhibitor, and 0.01-1 parts platinum catalyst.

3. The self-adhesive liquid silicone rubber for bonding fabric and molding silicone according to claim 2, characterized in that: The thickener A is prepared using the following method: The organic solvent, monomer A1, inhibitor, and platinum catalyst are mixed and heated to 70-90℃. Monomer A2 is added and the mixture is kept at this temperature for 3-5 hours. The mixture is then cooled to room temperature to remove the platinum catalyst and remove low-boiling substances under vacuum to obtain thickener A.

4. The self-adhesive liquid silicone rubber for bonding fabric and molding silicone according to claim 1, characterized in that: The thickener B is mainly made from the following raw materials in parts by weight: 35-100 parts organic solvent, 40-60 parts monomer B1, 40-60 parts monomer B2, 0.01-0.05 parts inhibitor, and 0.01-1 parts platinum catalyst.

5. The self-adhesive liquid silicone rubber for bonding fabric and molding silicone according to claim 4, characterized in that: The thickener B is prepared using the following method: Organic solvent, monomer B1, inhibitor, and platinum catalyst are mixed and heated to 70-90℃. Monomer B2 is added and kept at this temperature for 3-5 hours. The mixture is then cooled to room temperature to remove the platinum catalyst and remove low-boiling substances under vacuum to obtain thickener B.

6. The self-adhesive liquid silicone rubber for bonding fabric and molding silicone according to claim 1, characterized in that: The 2-vinyl-4,6-dialkoxy-1,3,5-triazine is one or both of 2-vinyl-4,6-diethoxy-1,3,5-triazine and 2-vinyl-4,6-dimethoxy-1,3,5-triazine.

7. The self-adhesive liquid silicone rubber for bonding fabric and molding silicone according to claim 1, characterized in that: The methyl vinyl silicone resin is mainly made from the following raw materials in parts by weight: 5-20 parts of methyl-terminated vinyl polysiloxane, 20-50 parts of dimethyl-terminated vinyl polysiloxane, 20-40 parts of fumed silica, 10-20 parts of vinyl MQ resin, 2-10 parts of dimethyl silicone oil, and 1-5 parts of hexamethyldisilazane.

8. The self-adhesive liquid silicone rubber for bonding fabric and molding silicone according to claim 7, characterized in that: The methyl vinyl silicone resin is prepared by the following method: Methyl-terminated vinyl polysiloxane, dimethyl-terminated vinyl polysiloxane, fumed silica, vinyl MQ resin, dimethyl silicone oil, and hexamethyldisilazane are mixed and kneaded for 4-6 hours. Then, the mixture is kneaded under vacuum at 170-190°C for 1-3 hours and cooled to room temperature to obtain methyl vinyl organosilicon resin.

9. The self-adhesive liquid silicone rubber for bonding fabric and molding silicone according to claim 1, characterized in that: In the raw materials of component B, the viscosity of the hydrogen-containing silicone oil at 25°C is 10-1000 mPa.s and the hydrogen content is 0.75-1.6 wt%.

10. A method for preparing a self-adhesive liquid silicone rubber for bonding fabric and molding silicone as described in any one of claims 1-9, characterized in that: Includes the following steps: Component A is obtained by mixing methyl vinyl silicone resin, platinum catalyst, and tackifier. Component B is obtained by mixing methyl vinyl silicone resin, tackifier, hydrogen-containing silicone oil, and inhibitor; Components A and B are mixed to obtain a self-adhesive liquid silicone rubber.

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