Preparation method of multi-crosslinked water-based acrylic resin
A water-based acrylic and multiple cross-linking technology, which is applied in the field of fine chemicals, can solve the problems of incomplete cross-linking reaction between hydroxyl groups and water-based amino groups, lower product qualification rate, and unsatisfactory paint film performance, so as to improve hardness and reduce baking temperature , Improve the effect of adhesion
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[0031] The preparation method of the described multi-crosslinked water-based acrylic resin of the present application may further comprise the steps:
[0032] 1) Add 40-100 parts of alcohols and alcohol-ether base solvents into the reaction kettle, and heat to 100-150°C under nitrogen gas and stirring conditions to make the system fully uniform and prepare a mixed solvent;
[0033] 2) Pour 5-20 parts of monomers with ketone carbonyl structure, 150-300 parts of acrylate monomers or vinyl monomers into the high-level tank and stir evenly, keep the temperature in the reactor at 100-150 °C, Add the mixed monomer in the high tank dropwise at a constant speed, and finish dropping in 3 to 5 hours;
[0034] 3) Keep it at a constant temperature for 0.5-1 hour, add 0.2-1 part of initiator into the reaction system, and continue to keep warm for 2 hours-4 hours;
[0035] 4) Lower the temperature in the reactor to 90-110°C, add a mixture of 4-15 parts of epoxy organosilane coupling agent ...
Embodiment 1
[0040]Put 10g of ethanol and 50g of propylene glycol methyl ether into the lower part of the reaction kettle, blow nitrogen, stir, and heat to about 100 degrees; put 10g of methyl vinyl ketone, 30g of methyl methacrylate, 50g of butyl acrylate, 20g of acrylic acid, and 40g Styrene, 30g hydroxyethyl methacrylate, and 3g azobisisobutyronitrile were poured into the elevated tank and stirred evenly, keeping the temperature in the reactor at about 100 degrees, and slowly adding the mixed monomers in the elevated tank into the system, The dropwise addition is completed in about 3 hours, add 0.3 g of azobisisobutyronitrile for 0.5 hours of reaction, continue to react for 2 hours and then cool down to 90 degrees, then add 6 g of epoxy trimethoxysilane and 0.2 g of tetramethylammonium chloride React the mixture at about 90°C for 2 hours, then add 21g of dimethylethanolamine to neutralize the reaction for 10min when the temperature is lowered to 65°C, then add 120g of water and 8g of dih...
Embodiment 2
[0042] Put 15g of isopropanol and 55g of n-butanol into the lower part of the reaction kettle, blow nitrogen, stir, and heat to about 105 degrees; put 12g of diacetone acrylamide, 29g of methyl methacrylate, 50g of butyl acrylate, and 23g of acrylic acid, Inject 48g of styrene, 28g of hydroxyethyl acrylate, and 3g of benzoyl peroxide into the head tank and stir evenly. Keep the temperature in the reactor at about 105 degrees and slowly add the mixed monomers in the head tank into the system dropwise. Add 0.3g of benzoyl peroxide after 0.5h of reaction, continue to react for 2h and then cool down to 95 degrees, then add a mixture of 8g of epoxytriethoxysilane and 0.3g of tetraethylammonium chloride React at about 95 degrees for 2.5 hours, then add 25g of triethylamine to neutralize the reaction for 10 minutes when the temperature is lowered to 65 degrees, then add 120g of water and 10g of adipic acid dihydrazide to increase the stirring speed and stir for 20 minutes, then filter...
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