Water-soluble basecoat composition for automobiles and method of forming a coating therewith
A technology for water-soluble coatings and compositions, applied in coatings, antifouling/underwater coatings, devices for coating liquids on surfaces, etc., can solve problems such as reduced water resistance, prevent flow and stains, and improve water resistance , the effect of good chipping resistance
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Synthetic example 1
[0080] Preparation of Alkaline Expandable Core-Shell Resin
[0081] 23 parts by weight of polycarbonate polyol with a molecular weight of 2,000, 64 parts by weight of dimethylolpropionic acid, 190 parts by weight of N-methylpyrrolidone, and 0.3 parts by weight of dibutyltin laurate were added to the reaction vessel . The temperature was raised to 65°C. Then, 220 parts by weight of 4,4 isocyanatocyclohexylmethane was slowly added. The temperature was raised to 80°C and maintained so that the NCO equivalent weight reached 970, whereby a prepolymer was prepared. 400 parts by weight of ion-exchanged water and 50 parts by weight of triethylamine were mixed at a temperature of 25˜35° C. and stirred rapidly. The prepolymer was added over 20 minutes to prepare an aqueous dispersion. Then, a mixture of 40 parts by weight of ion-exchanged water and 9.0 parts by weight of 80% hydrazine hydrate was added to extend the chain. A self-emulsifying type urethane aqueous dispersion havin...
Synthetic example 2
[0084] Preparation of curing agent mixture 1
[0085] 244 g of butyl cellosolve, 127 g of isopropanol, and 114 g of N-methyl-2-pyrrolidone were put into the container, followed by stirring. Add 220 g of hydrophilic melamine resin Cymel327 under stirring. After stirring for 10 minutes, add 220 g of hydrophobic melamine resin Setamine-146 at a temperature of 25-30° C. and stir for 20 minutes. Curing agent mixture 1 was prepared by adding 36.9 g of surfactant Surfynol-440.
Synthetic example 3
[0087] Preparation of Curing Agent Mixture 2
[0088]244 g of butyl cellosolve, 127 g of isopropanol, and 114 g of N-methyl-2-pyrrolidone were put into the container, followed by stirring. Under stirring, 176g of hydrophilic melamine resin Cymel327 was added. After stirring for 10 minutes, 246 g of hydrophobic melamine resin Setamine-146 was added at a temperature of 25 to 30° C. and stirred for 20 minutes. Curing agent mixture 2 was prepared by adding 36.9 g of surfactant Surfynol-440.
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