Water-based 2K coating with good weather resistance

Water-based 2K coating with good weather resistance

The weather-resistant water-based paint has no foaming property and it is prepared by mixing a hydroxyl functional acrylic polymer component and a water-dispersed isocyanate component. The hydroxy-functional acrylic polymer component comprises a hydrolyzable silicon-based vinyl polymer product in the main chain, and the water-dispersed isocyanate component comprises methyl diisocyanate-based polyisocyanate.

E.g:
Acrylic acid 3.6 parts butyl acrylate 20.4 parts Methyl methacrylate 24.5 parts
3-(3-Methacryloxypropyltrimethoxysilane) 8.7 parts were heated in a mixed solvent of 1-methoxy-2-propane and N-methyl-2-pyrrolidone in the presence of Vazo 67 (azo initiator) at reflux for 2 hours. ,cool down.
Hydroxyethyl methacrylate 50.0 parts Methyl methacrylate 37.1 parts
N,N-dimethylaminoethanol

Mixture A is obtained. In the reactor was added water, ferrous ammonium sulfate and erythorbic acid, and then the mixture A was added. After the temperature was adjusted to 29, a 35% hydrogen peroxide solution was added and the mixture was stirred until the reaction was exothermic for 1 hour to obtain a polymer.

On the system of polymer 92.5 copies
Drewplus L-405 Polysiloxane 0.4 parts
Tinuvin 295 pyridine compound, hindered amines, sebacic acid bis (1,2,2,6,6-pentamethyl-4-imidyl ester) 0.7 parts
Tinuvin 1130, UV absorber, 3-(2H-benzotriazol-2-yl-5-tert-butyl-4-hydroxyphenylpropionic acid methyl ester) 0.7 parts
Dowanol PM Propylene Glycol Monomethyl Ether 3.8 parts
Zonyl FSN Surfactant, Polyethylene Glycol, and Fluoropolymer 0.9 parts Other Additives 1.0 parts are slowly stirred and mixed, and 14.4 parts of Bayhydur XP7065 hexamethylene diisocyanate trimer are slowly mixed.

After mixing and filtering, a coating material with good weatherability was obtained.
International Patent 99-58589

Source: China Tobacco Packaging Ink Information Network

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