Preparation method for acidic silica sol in-situ modified acrylate emulsion
An acid silica sol, acrylate technology, applied in the coating and other directions, can solve the problems of secondary agglomeration, affecting the stability of the emulsion, complicated operation, etc., to achieve the effect of improving hardness, avoiding secondary dispersion, and improving stability
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Embodiment 1
[0032] Implement the preparation method of a kind of acidic silica sol situ modified acrylate emulsion provided by the present invention, carry out as follows:
[0033] The first step is silica sol modification. Add 16kg of deionized water and 20kg of acidic silica sol with a solid content of 25% into a 50L reactor, mix well, then add 4kg of ethanol and mix well, then slowly add 0.3kg of KH-560 to the reactor, 50°C The mixture was stirred and reacted for 3 hours to obtain a modified silica sol.
[0034] The second step is the synthesis of seed emulsion. In a reaction kettle with a volume of 100L, add 0.167kg of anionic emulsifier CO-436 and 0.334kg of nonionic emulsifier CO-897 into 4.5kg of deionized water, then add 14kg of modified silica sol and stir at 30°C for 15min, then Add 2.4kg of methyl methacrylate (MMA) and 0.8kg of butyl acrylate (BA) to pre-emulsify for half an hour, adjust the pH to 7-8 with ammonia water, and add 0.16kg of NaHCO 3 and 2kg of deionized water...
Embodiment 2
[0037] Compared with Example 1, the amount of emulsifier and initiator in this embodiment is changed. The amounts of CO-436 and CO-897 in the seed emulsion polymerization stage are 0.16 kg and 0.56 kg respectively, and the amount of initiator is 0.02 kg. The amount of CO-436 and CO-897 in the polymerization stage is 0.12kg and 0.42kg respectively, and the initiator is 0.072kg.
Embodiment 3
[0039] The modification methods of silica sol are different:
[0040] Modification of silica sol 1. Add 0kg of deionized water and 20kg of acidic silica sol with a solid content of 25% into a reactor with a volume of 50L, mix well, then add 4kg of ethanol and mix well, then slowly add 0.3kg of KH-550 to the reactor, 50°C The mixture was stirred and reacted for 3 hours to obtain a modified silica sol.
[0041] Modification of silica sol 2. Add 16kg of deionized water and 20kg of acidic silica sol with a solid content of 25% into a 50L reactor, mix well, then add 4kg of ethanol and mix well, then slowly add 0.25kg of KH-560 to the reactor, 50°C The mixture was stirred and reacted for 3 hours to obtain a modified silica sol.
[0042] Modification of silica sol 3. Add 16kg of deionized water and 20kg of acidic silica sol with a solid content of 25% into a 50L reactor, mix well, then add 5kg of ethanol and mix well, then slowly add 0.3kg of KH-560 to the reactor, at 45°C The m...
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