Acrylic acid series non-aqueous dispersoid

Abstract

The invention discloses a non-aqueous dispersant of acrylic acid series for double-component polyurethane paint with hydroxy component, which comprises the following parts: dispersing stabilizer, dispersing phase and dispersing dielectric with the molar rate of dispersing stabilizer and dispersing phase at (3-4):(6-7) and 50-70wt% solid content in the non-aqueous dispersant, wherein the dispersing stabilizer possesses linear acroleic acid polymer with active insaturated and double-bond; the content of hydroxyl group is 1-3wt% with glass transition point at -13-+15 deg.c; the weight average molecular weight is 16000-18000; the dispersing phase is gelatinized acroleic acid polymer with the grain size of gel particle at 0.2-0.8um; the glass transition point is 25-55 deg.c with hydroxyl group at 1-3wt%; the dispersing dielectric is composite solvent of aliphatic hydrocarbon and aromatic and ester solvent with at least 80wt% aliphatic hydrocarbon solvent.

Description

technical field [0001] The present invention relates to an acrylic non-aqueous dispersion particularly suitable as a hydroxyl component for two-component polyurethane coatings. Background technique [0002] In recent decades, water-dispersible acrylic or acrylate resin emulsions have been widely used to formulate architectural exterior paints. Although this resin emulsion has strong adhesion and good weather resistance, the life of the wall coating film prepared with it is generally 3 to 5 years, which is still not ideal. . For exterior wall coatings prepared with strong solvent-based acrylic resin, the old coating film on the wall body needs to be removed first when the exterior wall is refurbished, otherwise it is easy to cause bottoming phenomenon, resulting in uneven appearance of the new coating film; during construction, the coating smells heavy, It causes great harm to the construction personnel and the environment; the construction solid content of the coating is n...

AI Technical Summary

Problems solved by technology

For exterior wall coatings prepared with strong solvent-based acrylic resin, the old coating film on the wall body needs to be removed first when the exterior wall is refurbished, otherwise it is easy to cause bottoming phenomenon, resulting in uneven appearance of the new coating film; during construction, the coating smells heavy, It causes great harm to the construction personnel and the environment; the construction solid content of the coating is not high enough, the emission of volatile organic compounds (VOC) is relatively large, and the photochemical pollution of the solvent is relatively serious, which is not environmentally friendly

All in all, the current exterior wall coatings have the disadvantages of easy peeling of the coating film, serious pollution, and short service life of the wall coating film, especially not suitable for construction in winter, and it is not suitable for construction when the wall surface is not completely dry. prolong the construction period

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