Organic-inorganic compound modified waterborne acrylic epoxy ester resin and preparation method thereof

Abstract

The invention belongs to the field of waterborne coatings, and relates to an organic-inorganic compound modified waterborne acrylic epoxy ester resin and a preparation method thereof. The organic-mineral compound modified waterborne acrylic epoxy ester resin is synthesized by using the following raw materials in parts by weight: 30-70 parts of an epoxy ester, 5-50 parts of an acrylic monomer and 5-25 parts of silica sol, wherein the epoxy ester is prepared by carrying out catalytic reaction on 40-70 parts of an epoxy resin and 20-60 parts of an unsaturated fatty acid; the acrylic monomer comprises 20-60 parts of a vinyl monomer and 40-70 parts of an acrylic monomer; and the silica sol is obtained by reacting 10-50 parts of an organosilicone intermediate, 5-50 parts of a silane coupling agent, 20-70 parts of a cosolvent, 0.2-5 parts of a pH regulator and 5-15 parts of water. The nano silicon sol improves the tolerance and dryness of films; secondary crosslinking is formed along with pH value changes, so that the crosslinking density after film formation is increased; a structure taking the nano silicon sol as a core and taking an organic resin as a shell increases the stability of silicon hydroxyl; and the waterborned epoxy ester resin reduces the VOC content.

Description

technical field [0001] The invention relates to an organic-inorganic composite modified waterborne acrylic epoxy ester resin and a preparation method thereof, belonging to the field of waterborne industrial coatings. Background technique [0002] Alkyd resin has the characteristics of dryness, gloss, flexibility, good adhesion, good wetting performance to pigments, excellent construction performance, full coating and excellent decoration. However, its coating film is soft, and its water resistance and alkali resistance are not good. Due to the presence of a large number of ester bonds, the stability of waterborne alkyd resins is often problematic. A large amount of modification techniques have been developed at present, such as a kind of epoxy-modified water-based alkyd resin and its preparation method in patent CN101838389A. Improved adhesion and corrosion resistance, but did not solve the problem of alkyd resin hydrolysis stability; patent CN102391439A introduces sulfona...

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Problems solved by technology

This method uses emulsion polymerization to coat nanoparticles, but the performance limitations of the emulsion still exist, such as the impact of a large amount of emulsifier on gloss, resistance, etc.

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