Aqueous acrylic acid modified epoxy ester emulsion and its preparation method

Abstract

The invention relates to a preparation method of an aqueous acrylic acid modified epoxy ester emulsion. The method comprises the following steps: 1, preparing an acrylic resin A containing an aliphatic acid component; 2, preparing an epoxy ester resin B having a low acid value, wherein the acid value of the epoxy ester resin B is 5-10mgKOH / G; and 3, carrying out an esterifying reaction of the acrylic resin A and the epoxy ester resin B with the solid weight ratio of the acrylic resin A to the epoxy ester resin B being 1:3-1:1, neutralizing by amine or ammonia after the acid value is qualified, and diluting by water to obtain the aqueous acrylic acid modified epoxy ester emulsion having a solid content of 35-45wt% and an acid value of 20-50mgKOH / g. According to the invention, the preparation method is simple, and the aqueous acrylic acid modified epoxy ester emulsion has a very good hydrolysis resistance and a very good storage stability; and the dryness and the water resistance of the film of emulsion are improved; and the glossiness of the film is obviously improved.

Description

Technical field [0001] The invention relates to a preparation method of a waterborne acrylic modified epoxy ester emulsion. technical background [0002] Traditional solvent-based coatings need to use a large amount of organic solvents, which not only causes a large consumption of organic solvents, but also causes serious pollution to the environment. In order to save resources and protect the environment, countries all over the world have turned their attention to pollution-free or low-polluting water-based paints. [0003] In recent years, a series of anti-rust coatings have been developed in China, but most of them are solvent-based anti-rust coatings. In addition to containing a large amount of organic solvents, this type of coating also contains a large amount of toxic pigments, causing serious pollution to the environment. For this reason, research and development of new environmentally-friendly, water-based anti-rust coatings with excellent anti-rust performance is in line...

AI Technical Summary

Problems solved by technology

This type of preparation method also has the following disadvantages: (1) the reaction process is not easy to control, and gelation occurs easily; (2) in the synthesis process, due to the consumption of unsaturated double bonds on a large amount of fatty acids, the later stage dryness of the resin is due to The lack of unsaturated double bonds does not increase much; (3) the acid value of the resin is high, and the water resistance of the paint film is poor; (4) it needs to be neutralized with a large amount of organic amine (or ammonia), which has an unpleasant smell and is poisonous to the human body Function; (5) The pH value of the dispersion is generally above 8.5. At this high pH value, the ester group of the epoxy ester is easily hydrolyzed, which reduces the performance of the paint film