Waterborne two-component acrylic polyurethane intermediate coating and preparation method thereof
An acrylic polyurethane, two-component technology, applied in the field of coatings, can solve the problems of air pollution, strong odor, volatile, etc., and achieve the effect of accelerated cross-linking speed, good storage stability and sufficient cross-linking
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[0040] Such as figure 1 Shown, the present invention also includes a kind of preparation method of aqueous two-component acrylic polyurethane middle coating, comprising:
[0041] S101. Preparation of water-based hydroxyacrylic acid emulsion A: in a three-necked round-bottomed flask, dissolve sodium dodecylbenzenesulfonate in part of deionized water according to the distribution ratio of each component of water-based hydroxyacrylic acid emulsion A, and add methyl The mixture of methyl acrylate, styrene, isooctyl acrylate and hydroxyethyl methacrylate is added dropwise for 0.5-1h, and stirred for 1-2h after the addition to obtain pre-emulsion A; Add the emulsifier and the remaining deionized water to the four-necked round-bottomed flask of the condenser tube and stir evenly, place it in a constant temperature water bath and heat it to 80-85°C, and add the prepared pre-emulsified water dropwise into the four-necked round-bottomed flask Solution A, after 2-3 hours of dropwise add...
Embodiment 1
[0048] Preparation of waterborne two-component acrylic polyurethane intermediate coating S-1
[0049] S101. Preparation of water-based hydroxyacrylic acid emulsion A: In a three-necked round-bottomed flask, dissolve 1.4 g of sodium dodecylbenzenesulfonate in 16 g of deionized water, and add 28 g of methyl methacrylate and 2 g of styrene dropwise therein , the mixture of 10g isooctyl acrylate and 9.1g hydroxyethyl methacrylate, the dropping time is 0.5h, after the dropping is finished, stir for 2h to obtain the pre-emulsion A; In the bottom flask, add 0.5g emulsifier and 33g deionized water and stir evenly, place in a constant temperature water bath and heat to 80-85°C, add the prepared pre-emulsion A to the four-necked round-bottom flask drop by drop for 2 hours After the addition is completed, the temperature is controlled at 80-85°C for 1 hour, and then the temperature is lowered to 30°C, and the pH value is adjusted to 7-8 to obtain the water-based hydroxyacrylic acid emuls...
Embodiment 2
[0055] Preparation of waterborne two-component acrylic polyurethane intermediate coating S-2
[0056] S101. Preparation of water-based hydroxyacrylic acid emulsion A: In a three-necked round-bottomed flask, dissolve 2g of sodium dodecylbenzenesulfonate in 20g of deionized water, and dropwise add 27g of methyl methacrylate, 2g of styrene, The mixture of 11g of isooctyl acrylate and 7.7g of hydroxyethyl methacrylate, the dropwise addition time is 1h, after the dropwise addition is completed, stir for 1h to obtain pre-emulsion A; Add 0.3g emulsifier and 30g deionized water and stir evenly, place in a constant temperature water bath and heat to 80-85°C, add the prepared pre-emulsion A to the four-neck round bottom flask dropwise, and complete the dropwise addition in 2 hours , after the temperature is controlled at 80-85°C for 2 hours, the temperature is lowered to 30°C, and the pH value is adjusted to 7-8 to obtain the water-based hydroxyacrylic acid emulsion A;
[0057] S102. P...
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