High-viscosity organic silicon pressure-sensitive adhesive and preparation method thereof

Abstract

The invention discloses a high-viscosity organosilicone pressure-sensitive adhesive and a preparation method thereof, and relates to the technical field of organosilicone pressure-sensitive adhesives, the high-viscosity organosilicone pressure-sensitive adhesive comprises a component A, a component B and a component C. The component A comprises the following substances in parts by weight: 20-60 parts of vinyl-containing polysiloxane, 20-40 parts of vinyl-terminated silicone oil, 16-32 parts of MQ resin and 25-50 parts of ethyl acetate; the component B comprises the following components in parts by weight: 20-40 parts of hydrogen-containing silicone oil, 0.24-0.48 part of a tackifier and 5-20 parts of ethyl acetate; and the component C comprises the following components in parts by weight: 0.007-0.014 part of a catalyst a, 50-70 parts of xylene and 0.1-0.2 part of modified PBO fibers. The organic silicon pressure-sensitive adhesive provided by the invention has relatively high viscosity and also has excellent high temperature resistance.

Description

Technical Field

[0001] The present application relates to the field of organosilicon pressure-sensitive adhesive technology, and in particular to a high-viscosity organosilicon pressure-sensitive adhesive and a preparation method thereof. Background Art

[0002] Pressure-sensitive adhesive is a type of adhesive that can form a good bond with the adherend in a short time without the aid of solvents, heating or other methods, but only requires light pressure from the fingertips [1-3]. Pressure-sensitive adhesive has the characteristics of easy bonding to the substrate, being able to be easily peeled off from the surface of the substrate without damaging the substrate surface, having a long continuous bonding time, and being able to be reused without being contaminated. It is widely used in many fields such as packaging, electronic products, medical treatment, labels, office and home. Commonly used pressure-sensitive adhesives can be divided into: rubber-type pressure-sensitive adhesives, thermoplastic elastomer pressure-sensitive adhesives, polyurethane pressure-sensitive adhesives, acrylic pressure-sensitive adhesives, and silicone pressure-sensitive adhesives.

[0003] Silicone pressure-sensitive adhesive is currently the only pressure-sensitive adhesive that can be used normally at -73℃-300℃. It not only has good acid and alkali corrosion resistance, water resistance and weather resistance, but also has excellent high and low temperature resistance and biological inertness, and has good adhesion to low surface energy products such as silicone rubber.

[0004] Addition-type silicone pressure-sensitive adhesive has the advantages of fast curing speed, low curing temperature and no by-products during the curing process, and it itself has UV-curable vinyl groups. However, addition-type UV-curing silicone materials cannot be completely cured when exposed to ultraviolet light, and a subsequent dark reaction will occur. That is, after the ultraviolet light irradiation is stopped, the silane addition reaction in the system is still ongoing, resulting in poor adhesion of the addition-type UV-curing silicone pressure-sensitive adhesive after light curing, limiting its scope of use. Summary of the invention

[0005] In order to solve the problems existing in the above-mentioned addition-type UV-curing silicone pressure-sensitive adhesive, the present application provides a high-viscosity silicone pressure-sensitive adhesive and a preparation method thereof.

[0006] The present application provides a high-viscosity silicone pressure-sensitive adhesive, which adopts the following technical solution:

[0007] A high-viscosity organic silicone pressure-sensitive adhesive comprises three components A, B and C, wherein each component is composed of the following substances in parts by weight: component A: 20-60 parts of vinyl-containing polysiloxane, 20-40 parts of vinyl-terminated silicone oil, 16-32 parts of MQ resin, and 25-50 parts of ethyl acetate; component B: 20-40 parts of hydrogen-containing silicone oil, 0.24-0.48 parts of tackifier, and 5-20 parts of ethyl acetate; component C: 0.007-0.014 parts of catalyst a, 50-70 parts of xylene, and 0.1-0.2 parts of modified PBO fiber.

[0008] Preferably, the vinyl-terminated silicone oil is composed of vinyl-terminated silicone oil with a viscosity of 1000 mPa·s and vinyl-terminated silicone oil with a viscosity of 10000 mPa·s, with a mass ratio of 1:0.9-1.1.

[0009] Preferably, the tackifier is prepared from the following raw materials in parts by weight: 68-102 parts of hydrogenated silicone oil, 0.88-1.32 parts of catalyst b, 140-200 parts of xylene, 11.4-17.1 parts of allyl glycidyl ether, 14.8-22.2 parts of vinyltrimethoxysilane, and 1-3 parts of activated carbon.

[0010] Preferably, the hydrogen-containing silicone oil is prepared from the following raw materials in parts by weight: 66.7-100 parts of tetramethylcyclotetrasiloxane, 82.4-123.5 parts of octamethylcyclotetrasiloxane, 9-13.5 parts of hexamethyldisiloxane, and 1.1-1.7 parts of concentrated sulfuric acid.

[0011] Preferably, the method for preparing the hydrogen-containing silicone oil comprises the following steps:

[0012] Tetramethylcyclotetrasiloxane, octamethylcyclotetrasiloxane and hexamethyldisiloxane are mixed and stirred respectively, concentrated sulfuric acid is added as a catalyst, and the reaction is carried out at 30-40°C for 10-14 hours to obtain a crude product, and then the product is distilled under reduced pressure at 0.09-0.095MPa and 160-180°C for 4-6 hours to obtain hydrogenated silicone oil.

[0013] Preferably, the catalyst b is a Custer catalyst.

[0014] Preferably, the preparation method of the tackifier comprises the following steps:

[0015] Mix the hydrogenated silicone oil, catalyst and xylene evenly, heat to 65-75°C in a constant temperature oil bath, start to drop allyl glycidyl ether, react for 60-90 minutes, heat to 75-85°C, start to drop vinyltrimethoxysilane, react for 1.5-2h to obtain a crude product, then add activated carbon to the crude product and stir for 8-10h, let it stand and then filter, and perform reduced pressure distillation at 0.09-0.095MPa and 140-160°C to obtain a tackifier.

[0016] Preferably, the catalyst a is trimethyl(methyl-cyclopentadienyl)platinum.

[0017] Preferably, the method for preparing the modified PBO fiber comprises the following steps:

[0018] The dried PBO fiber is immersed in concentrated nitric acid, refluxed in a water bath at 60-70°C for 6-8 hours, taken out, washed in distilled water until neutral with ultrasonic stirring, and dried in a vacuum drying oven; the vacuum-dried PBO fiber is immersed in an ethanol solution of tetraethyl orthosilicate, ultrasonically dispersed for 30-40 minutes to uniformly disperse the fiber in the irradiation liquid, and then the PBO fiber is irradiated by co-irradiation to obtain modified PBO fiber.

[0019] The present application also provides a method for preparing a high-viscosity silicone pressure-sensitive adhesive, which adopts the following technical solution:

[0020] A method for preparing a high-viscosity silicone pressure-sensitive adhesive comprises the following steps:

[0021] Weigh each raw material by weight, stir and mix the vinyl-containing polysiloxane, vinyl-terminated silicone oil, MQ resin and ethyl acetate in a water bath at 70-90°C to obtain component A; stir and mix the hydrogen-containing silicone oil, tackifier and ethyl acetate to obtain component B; stir and mix the catalyst, xylene and modified PBO fiber to obtain component C, and store it in the dark; mix components A, B and C, stir evenly, and let stand to remove bubbles to obtain a high-viscosity silicone pressure-sensitive adhesive.

[0022] In summary, the present application includes at least one of the following beneficial technical effects:

[0023] 1. This application uses vinyl-terminated silicone oil with a viscosity of 1000mPa·s and a viscosity of 10000mPa·s, vinyl-containing polysiloxane, MQ resin, hydrogen-containing silicone oil, tackifier, and ethyl acetate as main raw materials, and under the action of photocatalyst trimethyl (methyl-cyclopentadienyl) platinum, compound modified PBO fiber, and the obtained addition-type UV-curable silicone pressure-sensitive adhesive has excellent viscosity and adhesion, and can be widely used on materials such as PET;

[0024] 2. The present application uses tetramethylcyclotetrasiloxane, octamethylcyclotetrasiloxane and hexamethyldisiloxane as raw materials, obtains side chain hydrogenated silicone oil by ring-opening polymerization, grafts vinyl trimethoxysilane and allyl glycidyl ether to the side chain of hydrogenated silicone oil by addition reaction, and the synthesized tackifier has excellent adhesion, so that the obtained addition type UV curing silicone pressure sensitive adhesive has good adhesion performance after light curing;

[0025] 3. This application uses acidification and irradiation to treat PBO fibers, which effectively improves the surface chemical properties and dispersibility of PBO fibers. When used in addition-type UV-curing silicone pressure-sensitive adhesives, it can significantly enhance the initial adhesion and lasting adhesion of the pressure-sensitive adhesive, and can also effectively enhance the heat resistance of the pressure-sensitive adhesive. DETAILED DESCRIPTION

[0026] The present application is further described in detail below with reference to the embodiments.

[0027] The chemical reagents used in the preparation examples, embodiments and comparative examples provided by the present invention are all commercially available products, and their brands and manufacturers are as follows:

[0028] Vinyl-terminated dimethylpolysiloxane, Wuhan Maikairui Chemical Co., Ltd.;

[0029] Vinyl MQ resin, Hubei Longsheng Sihai New Materials Co., Ltd.;

[0030] Vinyl-terminated silicone oil, Shanghai Guiyou New Material Technology Co., Ltd.

[0031] PBO fiber, Chengdu Xinchen New Materials Technology Co., Ltd.

[0032] Preparation Example

[0033] Preparation Example 1 Preparation of hydrogen-containing silicone oil

[0034] Preparation Example 1.1

[0035] 66.7 g of tetramethylcyclotetrasiloxane, 82.4 g of octamethylcyclotetrasiloxane and 9 g of hexamethyldisiloxane were mixed and stirred respectively, 1.1 g of concentrated sulfuric acid was added as a catalyst, and the mixture was reacted at 30°C for 10 h to obtain a crude product, which was then distilled under reduced pressure at 0.09 MPa and 160°C for 4 h to obtain hydrogenated silicone oil.

[0036] Preparation Example 1.2

[0037] 84 g of tetramethylcyclotetrasiloxane, 103 g of octamethylcyclotetrasiloxane and 11.2 g of hexamethyldisiloxane were mixed and stirred respectively, 1.4 g of concentrated sulfuric acid was added as a catalyst, and the mixture was reacted at 35°C for 12 h to obtain a crude product, which was then distilled under reduced pressure at 0.093 MPa and 170°C for 5 h to obtain hydrogenated silicone oil.

[0038] Preparation Example 1.3

[0039] 100 g of tetramethylcyclotetrasiloxane, 123.5 g of octamethylcyclotetrasiloxane and 13.5 g of hexamethyldisiloxane were mixed and stirred respectively, 1.7 g of concentrated sulfuric acid was added as a catalyst, and the mixture was reacted at 40°C for 14 h to obtain a crude product, which was then distilled under reduced pressure at 0.095 MPa and 180°C for 6 h to obtain hydrogenated silicone oil.

[0040] Preparation Example 2 Preparation of Thickener

[0041] Preparation Example 2.1

[0042] 68g of hydrogenated silicone oil prepared in Preparation Example 1, 0.88g of Castel catalyst and 140g of xylene were mixed evenly, heated to 65°C in a constant temperature oil bath, 11.4g of allyl glycidyl ether was added dropwise, and the reaction lasted for 60min. The temperature was raised to 75°C, and 14.8g of vinyltrimethoxysilane was added dropwise. The reaction lasted for 1.5h to obtain a crude product. 1g of activated carbon was added to the crude product and stirred for 8h. The product was allowed to stand and then filtered. The viscosity enhancer was obtained by vacuum distillation at 0.09MPa and 140°C.

[0043] Preparation Example 2.2

[0044] 85g of hydrogenated silicone oil prepared in Preparation Example 1, 1.1g of Custer catalyst and 170g of xylene were mixed evenly, heated to 70°C in a constant temperature oil bath, 14.3g of allyl glycidyl ether was added dropwise, and the reaction lasted for 75min. The temperature was raised to 80°C, and 18.5g of vinyltrimethoxysilane was added dropwise. The reaction lasted for 1.75h to obtain a crude product. 2g of activated carbon was added to the crude product and stirred for 9h. The product was allowed to stand and then filtered. The viscosity enhancer was obtained by vacuum distillation at 0.093MPa and 150°C.

[0045] Preparation Example 2.3

[0046] 102g of hydrogenated silicone oil prepared in Preparation Example 1, 1.32g of Custer catalyst and 200g of xylene were mixed evenly, heated to 75°C in a constant temperature oil bath, 17.1g of allyl glycidyl ether was added dropwise, and the reaction lasted for 90min. The temperature was raised to 85°C, and 22.2g of vinyltrimethoxysilane was added dropwise. The reaction lasted for 2h to obtain a crude product. 3g of activated carbon was added to the crude product and stirred for 10h. The product was allowed to stand and then filtered. The viscosity enhancer was obtained by vacuum distillation at 0.095MPa and 160°C.

[0047] Preparation Example 2.4

[0048] 68g of hydrogenated silicone oil prepared in Preparation Example 2, 0.88g of Custer catalyst and 140g of xylene were mixed evenly, heated to 65°C in a constant temperature oil bath, 11.4g of allyl glycidyl ether was added dropwise, and the reaction lasted for 60min. The mixture was heated to 75°C, and 14.8g of vinyltrimethoxysilane was added dropwise. The reaction lasted for 1.5h to obtain a crude product. 1g of activated carbon was added to the crude product and stirred for 8h. The mixture was allowed to stand and then filtered. The viscosity enhancer was obtained by vacuum distillation at 0.09MPa and 140°C.

[0049] Preparation Example 2.5

[0050] 68g of hydrogenated silicone oil prepared in Preparation Example 3, 0.88g of Custer catalyst and 140g of xylene were mixed evenly, heated to 65°C in a constant temperature oil bath, 11.4g of allyl glycidyl ether was added dropwise, and the reaction lasted for 60min. The temperature was raised to 75°C, and 14.8g of vinyltrimethoxysilane was added dropwise. The reaction lasted for 1.5h to obtain a crude product. 1g of activated carbon was added to the crude product and stirred for 8h. The product was allowed to stand and then filtered. The viscosity enhancer was obtained by vacuum distillation at 0.09MPa and 140°C.

[0051] Preparation Example 3 Preparation of modified PBO fiber

[0052] Preparation Example 3.1

[0053] 10g of dried PBO fiber was immersed in concentrated nitric acid, refluxed in a water bath at 60°C for 8h, taken out, washed in distilled water until neutral with ultrasonic stirring, and dried in a vacuum drying oven at 70°C; the vacuum-dried PBO fiber was immersed in an ethanol solution of tetraethyl orthosilicate, ultrasonically dispersed at 21kHz for 30min to uniformly disperse the fiber in the irradiation liquid, and then irradiated with a co-irradiation method at a given dose rate of 4.8kGy / h and an irradiation dose of 150kGy to obtain a modified PBO fiber.

[0054] Preparation Example 3.2

[0055] 10 g of dried PBO fiber was immersed in concentrated nitric acid, refluxed in a water bath at 65°C for 7 hours, taken out, washed in distilled water until neutral with ultrasonic stirring, and dried in a vacuum drying oven at 75°C; the vacuum-dried PBO fiber was immersed in an ethanol solution of tetraethyl orthosilicate, ultrasonically dispersed at 21.5 kHz for 35 minutes to uniformly disperse the fiber in the irradiation solution, and then the PBO fiber was irradiated with an irradiation dose of 155 kGy at a given dose rate of 4.9 kGy / h using a co-irradiation method to obtain a modified PBO fiber.

[0056] Preparation Example 3.3

[0057] 10g of dried PBO fiber was immersed in concentrated nitric acid, refluxed in a water bath at 70°C for 6h, taken out, washed in distilled water until neutral with ultrasonic stirring, and dried in a vacuum drying oven at 80°C; the vacuum-dried PBO fiber was immersed in an ethanol solution of tetraethyl orthosilicate, ultrasonically dispersed at 22kHz for 40min to uniformly disperse the fiber in the irradiation liquid, and then irradiated with a co-irradiation method at a given dose rate of 5kGy / h and an irradiation dose of 160kGy to obtain a modified PBO fiber.

[0058] Example

[0059] Example 1

[0060] 20g of vinyl-terminated dimethylpolysiloxane, 20g of vinyl-terminated silicone oil, 16g of MQ resin, and 25g of ethyl acetate were stirred and mixed evenly in a water bath at 70°C to obtain component A; 20g of hydrogen-containing silicone oil, 0.24g of tackifier, and 5g of ethyl acetate were stirred and mixed evenly to obtain component B; 0.007g of trimethyl (methyl-cyclopentadienyl) platinum, 50g of xylene, and 0.1g of modified PBO fiber were stirred and mixed evenly to obtain component C, and stored in the dark; after mixing components A, B, and C, the three components were stirred evenly, and allowed to stand to remove bubbles, thereby obtaining a high-viscosity silicone pressure-sensitive adhesive;

[0061] The MQ resin used in this embodiment is vinyl MQ resin; the terminal vinyl silicone oil used is composed of terminal vinyl silicone oil with a viscosity of 1000mPa·s and a viscosity of 10000mPa·s, with a mass ratio of 1:0.9; the hydrogenated silicone oil used is from Preparation Example 1.1; the viscosity enhancer used is from Preparation Example 2.1; and the modified PBO fiber used is from Preparation Example 3.1.

[0062] Example 2

[0063] 40g of vinyl-terminated dimethylpolysiloxane, 30g of vinyl-terminated silicone oil, 24g of MQ resin, and 37.5g of ethyl acetate were stirred and mixed in a water bath at 75°C to obtain component A; 30g of hydrogenated silicone oil, 0.36g of tackifier, and 12.5g of ethyl acetate were stirred and mixed to obtain component B; 0.011g of trimethyl (methyl-cyclopentadienyl) platinum, 60g of xylene, and 0.15g of modified PBO fiber were stirred and mixed to obtain component C, which was stored in the dark; after mixing components A, B, and C, the mixture was stirred evenly and allowed to stand to remove bubbles, thereby obtaining a high-viscosity silicone pressure-sensitive adhesive;

[0064] The MQ resin used in this embodiment is vinyl MQ resin; the terminal vinyl silicone oil used is composed of terminal vinyl silicone oil with a viscosity of 1000mPa·s and a viscosity of 10000mPa·s, with a mass ratio of 1:0.9; the hydrogenated silicone oil used is from Preparation Example 1.1; the viscosity enhancer used is from Preparation Example 2.1; and the modified PBO fiber used is from Preparation Example 3.1.

[0065] Example 3

[0066] 60g of vinyl-terminated dimethylpolysiloxane, 40g of vinyl-terminated silicone oil, 32g of MQ resin, and 50g of ethyl acetate were stirred and mixed in a water bath at 80°C to obtain component A; 40g of hydrogenated silicone oil, 0.48g of tackifier, and 20g of ethyl acetate were stirred and mixed to obtain component B; 0.014g of trimethyl (methyl-cyclopentadienyl) platinum, 70g of xylene, and 0.2g of modified PBO fiber were stirred and mixed to obtain component C, and stored in the dark; after mixing components A, B, and C, the three components were stirred evenly, and allowed to stand to remove bubbles, thereby obtaining a high-viscosity silicone pressure-sensitive adhesive;

[0067] The MQ resin used in this embodiment is vinyl MQ resin; the terminal vinyl silicone oil used is composed of terminal vinyl silicone oil with a viscosity of 1000mPa·s and a viscosity of 10000mPa·s, with a mass ratio of 1:0.9; the hydrogenated silicone oil used is from Preparation Example 1.1; the viscosity enhancer used is from Preparation Example 2.1; and the modified PBO fiber used is from Preparation Example 3.1.

[0068] Example 4

[0069] The difference between Example 4 and Example 1 is that the vinyl-terminated silicone oil used in Example 4 is composed of vinyl-terminated silicone oil with a viscosity of 1000 mPa·s and vinyl-terminated silicone oil with a viscosity of 10000 mPa·s, with a mass ratio of 1:1.

[0070] Example 5

[0071] The difference between Example 5 and Example 1 is that the vinyl-terminated silicone oil used in Example 5 is composed of vinyl-terminated silicone oil with a viscosity of 1000 mPa·s and vinyl-terminated silicone oil with a viscosity of 10000 mPa·s, with a mass ratio of 1:1.1.

[0072] Example 6

[0073] The difference between Example 6 and Example 1 is that the vinyl-terminated silicone oil used in Example 6 is a single vinyl-terminated silicone oil with a viscosity of 1000 mPa·s.

[0074] Example 7

[0075] The difference between Example 7 and Example 1 is that the vinyl-terminated silicone oil used in Example 7 is a vinyl-terminated silicone oil with a viscosity of 10000 mPa·s.

[0076] Example 8

[0077] The difference between Example 8 and Example 1 is that the viscosity enhancer used in Example 8 comes from Preparation Example 2.2.

[0078] Example 9

[0079] The difference between Example 9 and Example 1 is that the viscosity enhancer used in Example 9 comes from Preparation Example 2.3.

[0080] Example 10

[0081] The difference between Example 10 and Example 1 is that the viscosity enhancer used in Example 10 comes from Preparation Example 2.4.

[0082] Embodiment 11

[0083] The difference between Example 11 and Example 1 is that the viscosity enhancer used in Example 11 comes from Preparation Example 2.5.

[0084] Example 12

[0085] The difference between Example 12 and Example 1 is that the modified PBO fiber used in Example 12 comes from Preparation Example 3.2.

[0086] Embodiment 13

[0087] The difference between Example 13 and Example 1 is that the modified PBO fiber used in Example 13 comes from Preparation Example 3.3.

[0088] Comparative Example

[0089] Comparative Example 1

[0090] The difference between Comparative Example 1 and Example 1 is that no tackifier is added in Comparative Example 1.

[0091] Comparative Example 2

[0092] The difference between Comparative Example 2 and Example 1 is that in Comparative Example 2, no modified PBO fiber is added.

[0093] Comparative Example 3

[0094] The difference between Comparative Example 3 and Example 1 is that the PBO fiber used in Comparative Example 3 is unmodified PBO fiber.

[0095] Performance testing

[0096] The organic silicone pressure-sensitive adhesive obtained in Examples 1-13 and Comparative Examples 1-3 was coated on a PET film that had been pre-primed or corona treated, and the dry adhesive thickness was controlled to be 10-25 μm. The film was then placed in a UV curing machine for light curing at a wavelength of 365 nm and an energy of 2000 mJ / cm 2 , the number of illumination is 8 times, and the silicone pressure-sensitive adhesive is obtained;

[0097] (1) Use GB / T2792-2014 "Test method for peel strength of adhesive tape" to test the peel force of pressure-sensitive adhesive;

[0098] (2) The initial adhesion of the pressure-sensitive adhesive is tested using GB / T4852-2002 "Test method for initial adhesion of pressure-sensitive adhesive tapes (rolling ball method)";

[0099] (3) GB / T4851-2014 “Test method for holding adhesiveness of adhesive tapes” was used to test the holding force of pressure-sensitive adhesives;

[0100] (4) Use GB / T9286-1998 "Scratch test for paint and varnish films" to test the adhesion of pressure-sensitive adhesives;

[0101] The results are shown in Table 1.

[0102] The specific test results are as follows:

[0103] Table 1 Performance test results

[0104]

[0105]

[0106] It can be seen from the test results in Table 1 that the silicone pressure-sensitive adhesive provided by the present application has excellent peeling force, initial adhesion, lasting adhesion and adhesion; it shows that the high-viscosity silicone pressure-sensitive adhesive and its preparation method provided by the present application, the obtained addition-type UV-curing silicone pressure-sensitive adhesive can have good adhesion performance and viscosity after light curing.

[0107] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A high-viscosity silicone pressure-sensitive adhesive, characterized in that: The invention comprises three components A, B and C, each component being composed of the following substances in parts by weight: component A: 20-60 parts of vinyl-terminated dimethyl polysiloxane, 20-40 parts of vinyl-terminated silicone oil, 16-32 parts of MQ resin and 25-50 parts of ethyl acetate; component B: 20-40 parts of hydrogen-containing silicone oil, 0.24-0.48 parts of tackifier and 5-20 parts of ethyl acetate; component C: 0.007-0.014 parts of catalyst a, 50-70 parts of xylene and 0.1-0.2 parts of modified PBO fiber.

2. A high-viscosity silicone pressure-sensitive adhesive according to claim 1, characterized in that: The vinyl-terminated silicone oil is composed of vinyl-terminated silicone oil with a viscosity of 1000 mPa·s and vinyl-terminated silicone oil with a viscosity of 10000 mPa·s, with a mass ratio of 1:0.9-1.

1.

3. The high-viscosity silicone pressure-sensitive adhesive according to claim 1, characterized in that: The tackifier is prepared from the following raw materials in parts by weight: 68-102 parts of hydrogenated silicone oil, 0.88-1.32 parts of catalyst b, 140-200 parts of xylene, 11.4-17.1 parts of allyl glycidyl ether, 14.8-22.2 parts of vinyl trimethoxy silane, and 1-3 parts of activated carbon.

4. A high-viscosity silicone pressure-sensitive adhesive according to claim 1 or 3, characterized in that: The hydrogen-containing silicone oil is prepared from the following raw materials in parts by weight: 66.7-100 parts of tetramethylcyclotetrasiloxane, 82.4-123.5 parts of octamethylcyclotetrasiloxane, 9-13.5 parts of hexamethyldisiloxane, and 1.1-1.7 parts of concentrated sulfuric acid.

5. A high-viscosity silicone pressure-sensitive adhesive according to claim 4, characterized in that: The preparation method of the hydrogen-containing silicone oil comprises the following steps: Tetramethylcyclotetrasiloxane, octamethylcyclotetrasiloxane and hexamethyldisiloxane are mixed and stirred respectively, concentrated sulfuric acid is added as a catalyst, and the reaction is carried out at 30-40°C for 10-14 hours to obtain a crude product, and then the product is distilled under reduced pressure at 0.09-0.095MPa and 160-180°C for 4-6 hours to obtain hydrogenated silicone oil.

6. The high-viscosity silicone pressure-sensitive adhesive according to claim 3, characterized in that: The catalyst b is a Custer catalyst.

7. The high-viscosity silicone pressure-sensitive adhesive according to claim 3, characterized in that: The preparation method of the tackifier comprises the following steps: Mix the hydrogenated silicone oil, catalyst and xylene evenly, heat to 65-75°C in a constant temperature oil bath, start to drop allyl glycidyl ether, react for 60-90 minutes, heat to 75-85°C, start to drop vinyltrimethoxysilane, react for 1.5-2h to obtain a crude product, then add activated carbon to the crude product and stir for 8-10h, let it stand and then filter, and perform reduced pressure distillation at 0.09-0.095MPa and 140-160°C to obtain a tackifier.

8. The high-viscosity silicone pressure-sensitive adhesive according to claim 1, characterized in that: The catalyst a is trimethyl(methyl-cyclopentadienyl)platinum.

9. The method for preparing a high-viscosity silicone pressure-sensitive adhesive according to claim 1, characterized in that: The preparation method of the modified PBO fiber comprises the following steps: The dried PBO fiber is immersed in concentrated nitric acid, refluxed in a water bath at 60-70°C for 6-8 hours, taken out, washed in distilled water until neutral with ultrasonic stirring, and dried in a vacuum drying oven; the vacuum-dried PBO fiber is immersed in an ethanol solution of tetraethyl orthosilicate, ultrasonically dispersed for 30-40 minutes to uniformly disperse the fiber in the irradiation liquid, and then the PBO fiber is irradiated by co-irradiation to obtain modified PBO fiber.

10. A method for preparing a high-viscosity organosilicon pressure-sensitive adhesive according to any one of claims 1 to 9, characterized in that: The following steps are involved: Weigh each raw material by weight, stir and mix vinyl-terminated dimethyl polysiloxane, vinyl-terminated silicone oil, MQ resin, and ethyl acetate in a water bath at 70-90° C. to obtain component A; stir and mix hydrogen-containing silicone oil, tackifier, and ethyl acetate to obtain component B; stir and mix the catalyst, xylene, and modified PBO fiber to obtain component C, and store it away from light; mix components A, B, and C, stir evenly, and let stand to remove bubbles to obtain a high-viscosity silicone pressure-sensitive adhesive.

Images