A kind of preparation method of imidization SMA modified cationic styrene-acrylic sealing primer

Abstract

The invention relates to a preparation method of an imidized SMA-modified cationic styrene-acrylic sealing primer. , 10% to 25% of extender pigment, 1% to 5% of propylene glycol, 2% to 10% of auxiliary agent, 20% to 35% of deionized water; Paint, has excellent resistance to efflorescence, anti-salting, strong sealing; excellent substrate permeability, good adhesion to the substrate and topcoat; excellent temperature resistance, water resistance; cationic properties, in the alkali Cross-linking under natural conditions, excellent resistance to alkali and salting out; no solvent, no alkyl phenol, no heavy metals, very low VOC, environmental protection; suitable for interior and exterior walls, cement walls, concrete, gypsum board, asbestos board and other surface coating.

Description

technical field [0001] The invention relates to a preparation method of an architectural coating primer, in particular to an imidized SMA modified cationic styrene-acrylic sealing primer suitable for various interior and exterior wall coatings. Background technique [0002] The base material of building exterior walls is mostly cement mortar or concrete surface, which is characterized by porous and strong alkalinity. Among them, the porous structure makes the water absorption strong, which makes the surface of the decorative coating not smooth enough, which easily causes the coating film to wrinkle, and may cause the coating film to dry too fast and cause the topcoat to crack; strong alkalinity will lead to chemical degradation of the resin in the coating, Accelerate the aging process of the coating film, reduce the service life of the coating, and at the same time cause the pigment particles to be exposed, lose the protection of the resin and cause fading; based on the char...

AI Technical Summary

Problems solved by technology

Among them, the porous structure makes the water absorption strong, which makes the surface of the decorative coating not smooth enough, which easily causes the coating film to wrinkle, and may cause the coating film to dry too fast and cause the topcoat to crack; strong alkalinity will lead to chemical degradation of the resin in the coating, Accelerate the aging process of the coating film, reduce the service life of the coating, and at the same time cause the pigment particles to be exposed, lose the protection of the resin and cause fading; based on the characteristics of the substrate, it is required to use an anti-alkali primer to effectively prevent alkali and salt. Precipitate, and provide a strong adhesion base for the topcoat, in order to maintain the beauty and durability of the decorative coating

[0003] The existing styrene-acrylic sealing primers and acrylic sealing primers are generally prepared from anionic emulsions, but they have the disadvantages of poor adhesion and weak alkali resistance; the particle size of the emulsion is large, and the surface tension is also very large. It is difficult to penetrate into the tiny capillary pores inside the substrate, so it can only rely on the compactness of the coating film on the surface of the substrate to achieve the effect of the back cover

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