Powder coating for automotive topcoat
A technology for powder coatings and automotive topcoats, used in powder coatings, polyester coatings, epoxy resin coatings, etc.
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preparation example Construction
[0016] The preparation method of above-mentioned powder coating, comprises the following steps,
[0017] 1) By weight percentage, 3%-5% hydroxyl acrylic resin, 0.8%-2% epoxy resin, 12.5%-14.5% polyether ester, 45%-50% polyester resin, 0.3% -0.6% dibutyltin dilaurate, 0.4%-0.6% benzoin, 2%-2.2% leveling agent, 22.5%-25.5% titanium dioxide and 8%-12% ε-caprolactam blocked isofor Alone diisocyanate is used for batching;
[0018] 2) Put polyether ester, polyester resin, dibutyltin dilaurate, benzoin, leveling agent, titanium dioxide and ε-caprolactam blocked isophorone diisocyanate into the mixer and mix for 15-20 minutes Obtain compound A; Mix hydroxyacrylic resin and epoxy resin for 10-13 minutes to obtain compound B;
[0019] 3) Use a twin-screw extruder to extrude compound A at the front end at 75°C-85°C, raise the temperature of the extruder to 110°C-120°C in the middle section, then add compound B, and extrude it. Powder coating is obtained after pulverization.
[0020] ...
Embodiment 1
[0028] A kind of powder coating for automobile finish, by weight percentage, 3% hydroxyl acrylic resin, 1.0% bisphenol A epoxy resin, 12.5% polyether ester, 50% unsaturated polyester resin, 0.5% bisphenol A Dibutyltin laurate, 0.5% benzoin, 2.0% leveling agent, 22.5% titanium dioxide and 8% ε-caprolactam blocked isophorone diisocyanate.
Embodiment 2
[0030] A kind of powder coating for automobile finish, by weight percentage, 5% hydroxyl acrylic resin, 1.5% bisphenol A epoxy resin, 12.5% polyether ester, 45% unsaturated polyester resin, 0.6% di Dibutyltin laurate, 0.6% benzoin, 2.1% leveling agent, 22.5% titanium dioxide and 10.2% ε-caprolactam blocked isophorone diisocyanate.
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