Base adhesive of silicone pressure sensitive adhesive and preparation method thereof
A silicon pressure-sensitive adhesive-based adhesive and silicon pressure-sensitive adhesive-based technology, applied in adhesives and other directions, can solve the problems of large molecular weight of MQ silicone resin, affect the performance of silicone pressure-sensitive adhesive, and difficult to take out, and improve the compatibility of the system. , excellent system compatibility, the effect of simplifying the process flow
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Embodiment 1-4
[0030] Add 225 g of SiO 2 The content is 40% polyethyl silicate, 97.2 grams of hexamethyldisiloxane and 198 grams of glacial acetic acid, after stirring evenly, add 4.93 grams of 98% concentrated sulfuric acid, stir at room temperature for 60 minutes, then heat up, and reflux React at a temperature of 76-78°C for 4 hours, stop heating, add 148 grams of saturated sodium carbonate aqueous solution to adjust the pH to 8.5 after the reaction liquid is cooled to room temperature, and let it stand for stratification to obtain 436.85 grams of MQ silicone resin prepolymer solution with a solid content of 44.11 %.
[0031] Take 100 grams of the above-mentioned MQ silicone resin prepolymer solution and add it to 44.11 grams of vinyl silicone oils of different viscosities (see Table 1), stir evenly, heat up, and when the temperature reaches 150°C, turn on the vacuum pump and pull it down. After compression polymerization under reduced pressure at ℃ for 1.5 h, the heating was stopped, an...
Embodiment 5-8
[0039] Add 225 g of SiO 2 The content is 40% polyethyl silicate, 121.5 grams of hexamethyldisiloxane and 189 grams of glacial acetic acid, after stirring evenly, add 3.47 grams of 98% concentrated sulfuric acid, stir at room temperature for 60 minutes, then heat up, and reflux React at a temperature of 76-78°C for 4 hours, stop heating, take out four 150-gram reaction solutions after cooling to room temperature, add saturated aqueous sodium carbonate solution to adjust the pH to 5, 7, 8 and 9, and stand to separate layers to obtain MQ silicon The resin prepolymer solution has a solid content of 46.58%, 45.82%, 44.31% and 43.56%, respectively.
[0040]Take 100 grams of the above-mentioned MQ silicone resin prepolymer solution, add 46.58 grams, 45.82 grams, 44.31 grams and 43.56 grams of double-ended vinyl silicone oil with a viscosity of 20000 mPa·s and a vinyl content of 0.087%, respectively, stir evenly, and heat up. When the temperature reached 150°C, turn on the vacuum pum...
Embodiment 9-12
[0045] Add 225 g of SiO 2 The content is 40% polyethyl silicate, 97.2 grams of hexamethyldisiloxane and 198 grams of glacial acetic acid, after stirring evenly, add 4.93 grams of 98% concentrated sulfuric acid, stir at room temperature for 60 minutes, then heat up, and reflux React at a temperature of 76-78°C for 4 hours, stop heating, add 148 grams of saturated sodium carbonate aqueous solution to adjust the pH to 8.5 after the reaction liquid is cooled to room temperature, and let it stand for stratification to obtain 436.85 grams of MQ silicone resin prepolymer solution with a solid content of 44.11 %.
[0046] Take 100 grams of the above-mentioned MQ silicone resin prepolymer solution and add it to 44.11 grams of vinyl silicone oil with a viscosity of 20,000 mPa·s, stir evenly, heat up, and when the temperature reaches 120, 150, 160 and 180 °C respectively, the pressure reduction polymerization reaction is 1.5 h, stop heating, and filter while hot to obtain the silicone p...
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