Reflective heat-insulation modified acrylic waterproof coating and preparation method thereof
A waterproof coating, acrylic technology, applied in reflective/signal coatings, antifouling/underwater coatings, coatings, etc. Excellent anti-cracking performance, good storage stability, simple and easy-to-control production process
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[0019] In the present invention, preferably, the preparation method of the modified pure acrylic emulsion further comprises: after adding the polytetrafluoroethylene emulsion, lowering the temperature to below 35°C, adding aqueous sodium hydroxide solution to adjust the pH to 8-9.5, and obtaining The modified pure acrylic emulsion.
[0020] According to the present invention, preferably, in step (1), in terms of parts by weight, the amount of butyl acrylate is 10-40 parts, the amount of acrylonitrile is 1-5 parts, and the amount of methacrylic acid is 0.1-40 parts. 0.5 parts, the consumption of the first emulsifier is 0.1-0.5 parts and the consumption of water is 5-10 parts;
[0021] In step (2), in parts by weight, the amount of the second emulsifier is 0.1-0.5 parts, the amount of water is 10-20 parts, the amount of initiator aqueous solution is 0.3-0.5 parts, the monomer pre-dispersed The consumption of body A is 30-50 parts, the consumption of methacrylic acid is 0.5-2 pa...
preparation example 1
[0047] Take 40 parts of butyl acrylate, 2 parts of acrylonitrile, 0.2 part of methacrylic acid and add 0.2 part of sodium dodecylsulfonate and 10 parts of water, and emulsify to obtain monomer predispersion A;
[0048] Add 15 parts of water and 0.2 parts of sodium dodecylsulfonate into the reactor and raise the temperature to 78°C, directly add 0.3 parts of an initiator aqueous solution with a mass concentration of 15%, and drop 45 parts of monomer predispersion A within 2 hours After the dropwise addition, keep it warm for 1 hour, then directly add 1 part of methacrylic acid, after swelling for 1 hour, start to drop 3 parts of polytetrafluoroethylene emulsion with a solid content of 60%, and drop it completely within 1 hour; lower the temperature to 35°C, add a 2% sodium hydroxide aqueous solution to adjust the pH to 9, and obtain a 55% solid content modified pure acrylic emulsion; wherein, the initiator used to configure the initiator aqueous solution is sodium persulfate.
preparation example 2
[0050] Take 35 parts of butyl acrylate, 5 parts of acrylonitrile, 0.3 part of methacrylic acid, add 0.2 part of monocaprylic acid glyceride and 8 parts of water, and emulsify to obtain monomer predispersion A;
[0051] Add 17 parts of water and 0.1 part of glyceryl monocaprylate into the reactor and raise the temperature to 78°C, directly add 0.4 parts of an initiator aqueous solution with a mass concentration of 15%, drop 40 parts of monomer predispersion A within 2 hours, add dropwise Complete the heat preservation for 1 hour, then add 1.5 parts of methacrylic acid directly, after swelling for 1 hour, start to drop 6 parts of polytetrafluoroethylene emulsion with a solid content of 60%, and drop it completely within 1 hour; lower the temperature to 35°C , adding a mass concentration of 2% sodium hydroxide aqueous solution to adjust the pH to 9 to obtain a 54% solid content modified pure acrylic emulsion; wherein, the initiator used to configure the initiator aqueous solution ...
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