A kind of waterborne acrylic polyurethane topcoat and its preparation method and application
The technology of acrylic polyurethane and hydroxy polyacrylate is applied in the field of thick-coating water-based acrylic polyurethane topcoat for locomotives and vehicles and its preparation, which can solve the problems such as the inability to meet the performance requirements of vehicle exterior wall paint, and achieve good chemical resistance and construction time. Shortening, low VOC effect
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Embodiment 1
[0068] A water-based polyurethane topcoat acrylic acid, including two parts of paint and curing agent, according to the weight of the part, the composition of raw materials as shown in Table 1;
[0069] Table 1 Three formulations of the present invention
[0070]
[0071]
[0072] The preparation steps of the waterborne polyurethane topcoat are:
[0073]A, the preparation of paint: the above 16 raw materials composed of paint according to the proportion of weight, first pour the No. 1 hydroxy polyacrylate water dispersion into the container cylinder, and the container cylinder is placed under the dispersion machine for dispersion, adjust the speed of 500-800 rpm, and then add the dispersant, pyrogenic silica, surfactant, defoamer, deionized water, and pigment (filler) material in turn under the stirring state. After the feeding is completed, adjust the speed of the disperser to 1000-1200 rpm, stir for 20-30 minutes, that is, the pre-dispersion slurry is obtained; Then use the ...
Embodiment 2
[0082] Prepare the raw materials according to the recipe shown in Table 3 by weight;
[0083] Table 3 Comparison of the six formulations of the present invention
[0084]
[0085]
[0086] The preparation steps of the waterborne polyurethane topcoat are:
[0087]A, the preparation of paint: the above raw materials that make up the paint are compared to weight, first pour the No. 1 hydroxy polyacrylate water dispersion into the container cylinder, and place the container cylinder under the dispersing machine for dispersion, adjust the speed to 500-800 rpm, and then add the dispersant, pyrogenic silica, surfactant, defoamer, deionized water, and pigment (filler) material in turn under the stirring state. After the feeding is completed, adjust the speed of the disperser to 1000-1200 rpm, stir for 20-30 minutes, that is, the pre-dispersion slurry is obtained; Then use the diaphragm pump to pre-disperse slurry pump such as a sand mill, grind to fineness ≤ 10 μm discharge, and then ...
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Abstract
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