Waterborne polyurethane-acrylic acid water-based paint and preparation method thereof
A water-based polyurethane and acrylic water-based technology, applied in coatings and other directions, can solve the problems of hardness, oil resistance, chemical reagent resistance, water resistance, hot stickiness, cold brittleness, etc., and achieve good fullness, high solid content, and continuous freshness. good sex effect
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[0021] The invention provides a kind of preparation method of water-based polyurethane-acrylic acid water-based paint, it comprises the following steps:
[0022] Preparation of waterborne polyurethane-acrylic acid
[0023] (1) Add polyether diol to a four-necked flask equipped with a stirrer, a thermometer and a condensing tube, and carry out dehydration treatment for 1-3 hours at a temperature of 90-120°C, and then add diphenylmethane diisocyanate (N- MDEA) and methyl methacrylate (MMA) were reacted for 1-3 hours at a controlled temperature of 70-100°C to prepare a mixed solution A;
[0024] (2) Add N-methylpyrrolidone and methacrylic acid to the mixed liquid A prepared in step (1) and control the temperature at 60-90°C for 1-3 hours, then add the chain extender butanediol at 60 Perform chain extension reaction at ~90°C for 1-3 hours to prepare mixed solution B;
[0025] (3) Add triethylamine to the mixed solution B prepared in step (2), and react at a temperature of 30-50°...
Embodiment 1
[0037] Preparation of waterborne polyurethane-acrylic acid
[0038] (1) Add 30g of polyether diol to a four-necked flask equipped with a stirrer, thermometer and condenser, dehydrate at a temperature of 90°C for 1h, and then add 20g of diphenylmethane diisocyanate (N-MDEA) React with 10 g of methyl methacrylate (MMA) at a controlled temperature of 70°C for 1 h to prepare a mixed solution A;
[0039] (2) Add 10g of N-methylpyrrolidone and 20g of methacrylic acid to the mixed liquid A prepared in step (1) and control the temperature at 60°C for 1h, then add chain extender 20g of butanediol at 60°C The chain extension reaction was carried out under the condition of 1h, and the mixed liquid B was obtained;
[0040] (3) Add 15g of triethylamine to the mixed liquid B prepared in step (2), react at a temperature of 30°C for 30mins, add water after the reaction and stir quickly to mix evenly, and stir at a temperature of 40°C 30mins made mixed solution C;
[0041] (4) Add 15g of co...
Embodiment 2
[0045] Preparation of waterborne polyurethane-acrylic acid
[0046] (1) Add 40g of polyether diol to a four-necked flask equipped with a stirrer, a thermometer and a condenser tube, dehydrate at a temperature of 100°C for 2 hours, and then add 20g of diphenylmethane diisocyanate (N-MDEA) React with 15 g of methyl methacrylate (MMA) at a controlled temperature of 80°C for 2 hours to prepare a mixed solution A;
[0047] (2) Add 10g of N-methylpyrrolidone and 20g of methacrylic acid to the mixed liquid A prepared in step (1) and control the temperature at 60°C for 1 hour, then add chain extender 20g of butanediol at 60°C The chain extension reaction was carried out under the condition of 1h, and the mixed liquid B was obtained;
[0048] (3) Add 25g of triethylamine to the mixed liquid B prepared in step (2), react at a temperature of 30°C for 30mins, add water after the reaction and stir quickly to mix evenly, and stir at a temperature of 40°C 30mins made mixed solution C;
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