A kind of preparation method of room temperature moisture curing silicone resin
A moisture-curing, silicone resin technology, applied in the field of silicone resins, to achieve the effect of easy availability, excellent adhesion and hardness, and improved storage stability
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[0031] A preparation method of room temperature moisture curing silicone resin, comprising the following steps:
[0032] Step A: Add the mixed solution of acidic catalyst and water to the mixed solution of difunctional siloxane monomer, trifunctional siloxane monomer and solvent, hydrolyze and react for 2-6 hours at a temperature of 25-70°C, and then raise High temperature to reflux reaction for 2-8 hours; then stand for stratification, wash the pre-polysilicone resin until neutral, then heat and rotary steam under reduced pressure to remove small molecular substances, and obtain pure pre-polysilicone resin;
[0033] Step B: adding solvent, alkoxy monomer and end-blocking catalyst to the pre-polysilicone resin, reacting at a temperature of 70-100° C. for 1-10 hours, and heating under reduced pressure to remove the catalyst and small molecules to obtain the silicone resin.
[0034] The following is a preference for the above scheme, wherein the difunctional siloxane monomer in ...
Embodiment 1
[0052] Add 35 parts of methyltrimethoxysilane, 55 parts of phenyltrimethoxysilane, 20 parts of dimethyldimethoxysilane and 30 parts of methylphenyldimethoxysilane into the three-necked flask, and stir for 10 minutes at room temperature ; Slowly add 120 parts of sulfuric acid aqueous solution with a mass fraction of 2% and 100 parts of isopropanol mixture dropwise under stirring at room temperature, and drop it for 60 minutes. After dropping, raise the temperature to 60°C and stir for 3 hours, then heat up to reflux for 6 hours After the reflux reaction is finished, cool to room temperature, and add 200 parts of toluene to stir and mix evenly, pour into a separatory funnel and add a large amount of deionized water, wash with water, leave to stand for layering, get the toluene phase and continue washing until the washing liquid is until neutral; after washing with water, add anhydrous magnesium sulfate to the toluene phase to further remove water, pour it into a single-necked fla...
Embodiment 2
[0056] Add 30 parts of methyltrimethoxysilane, 40 parts of phenyltrimethoxysilane, 30 parts of dimethyldimethoxysilane and 40 parts of methylphenyldimethoxysilane into the three-necked flask, and stir for 10 minutes at room temperature ; Slowly add 120 parts of sulfuric acid aqueous solution with a mass fraction of 2% and 100 parts of isopropanol mixture dropwise under stirring at room temperature, and drop it for 60 minutes. After dropping, raise the temperature to 60°C and stir for 3 hours, then heat up to reflux for 6 hours After the reflux reaction is finished, cool to room temperature, and add 200 parts of toluene to stir and mix evenly, pour into a separatory funnel and add a large amount of deionized water, wash with water, leave to stand for layering, get the toluene phase and continue washing until the washing liquid is until neutral; after washing with water, add anhydrous magnesium sulfate to the toluene phase to further remove water, pour it into a single-necked fla...
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