Polyester modified core shell self crosslinking styrene-acrylate emulsion and preparation method thereof and anticorrosion coating therewith

Abstract

The invention relates to a polyester modified core shell self crosslinking styrene-acrylate emulsion and a preparation method thereof and an anticorrosion coating therewith, wherein polyester with multi-branched structure and containing carboxyl is introduced into the core shell of the latex particle of the styrene-acrylate emulsion; the Tg of the shell layer is -30-0 DEG C and the Tg of the corelayer is 10-80 DEG C; in a monomer composing the core layer of the latex particle, a functional monomer containing glycidyl accounts for 0.5-3 percent; and in a monomer composing the shell layer of the latex particle, polyester accounts for 5-20 percent, and a functional monomer containing carboxyl accounts for 1.5-5 percent. The stability of calcium ions in the emulsion is obviously improved; and the anticorrosion coating containing the styrene-acrylate emulsion has the formula (by weight parts): 40-50 of the styrene-acrylate emulsion, 10-30 of ferrotitanium powder, 20 of iron oxide red, 12-20 of kaolin, 10-30 of bentonite and 0.1-1 of dispersing agent. The compactness and hardness and the compositive corrosion resistance of the coating are obviously improved for the polyester introducedinto the latex particle and the self crosslinking structure.

Description

Polyester modified core-shell self-crosslinking styrene-acrylic emulsion and its preparation method and anti-corrosion coating technical field The invention relates to a polyester modified core-shell self-crosslinking styrene-acrylic emulsion, a preparation method thereof and an anti-corrosion coating. Background technique In recent years, with people's increasing attention to environmental issues and the continuous reduction of limited oil resources, water-based coatings have become a common requirement for environmental protection and oil resource conservation. At present, water-based coatings have been widely used in the field of electrophoretic coatings and architectural coatings, but their use in metal anti-corrosion coatings is still very limited, mainly because the existing water-based metal coatings generally have poor film formation and insufficient coatings. Density, short anti-corrosion period and other issues limit its application. At present, various resins ...

AI Technical Summary

Problems solved by technology

At present, water-based coatings have been widely used in the field of electrophoretic coatings and architectural coatings, but their use in metal anti-corrosion coatings is still very limited, mainly because the existing water-based metal coatings generally have poor film formation and insufficient coatings. Density, short anti-corrosion period and other issues limit its application

At present, various resins used in water-based anti-corrosion coatings include: water-based alkyd resin, water-based polyurethane resin, water-based epoxy resin, and water-based acrylic resin. Among them, the single-component room temperature self-crosslinking styrene-acrylic emulsion, because of its low price, The advantages of simple construction process, low film-forming temperature, good dryness, and cross-linking to form a dense coating have always attracted people's attention. However, most of these emulsions are homogeneous latex particles made by ordinary polymerization methods. Gradient change, there are disadvantages such as brittle coating film in winter, severe sticking back in summer, insufficient mechanical strength of coating film, poor stain resistance and sticking back resistance, etc.