Anionic emulsifier, and preparation method and application thereof

Abstract

The invention discloses an anionic emulsifier, and a preparation method and application thereof. The anionic emulsifier is prepared from sulfanilic acid, epoxy active diluent and epoxy resin according to a mol ratio of 1: 1: 1.05-1.15. Specifically, the preparation method comprises a step of preparing the anionic emulsifier with a solid content of 50 to 55% from epoxy resin, epoxy active diluent and sulfanilic acid under the catalysis of triphenyl phosphine. The structure of the anionic emulsifier provided by the invention is unique and innovative; and a benzenesulfonate group, an epoxy group (provided by the epoxy resin) and a lipophilic chain segment are introduced into a same molecule, so excellent emulsification performance of the anionic emulsifier is guaranteed, and the anionic emulsifier can be ideally applied to epoxy emulsion. The anionic emulsifier is a reactive anionic emulsifier and has strong emulsification and epoxidation capacity; and the anionic emulsifier can crosslink with an epoxy hardener so as to reduce the mobility of the anionic emulsifier in a paint film, so influence on water resistance is reduced.

Description

technical field [0001] The invention relates to the technical field of functional materials, and more specifically relates to an anionic emulsifier and its preparation method and application. Background technique [0002] Water-based epoxy paint is based on water-based epoxy resin system, adding pigments, fillers and additives, and the paint is made through a certain process. It is an environmentally friendly epoxy resin paint. This environmentally friendly paint has the following advantages : (1) Use water as diluent, very low VOC; (2) The coating has good adhesion to wet substrates and good one-way air permeability; (3) Good recoatability, strong interlayer adhesion, and more efficient construction Convenient; (4) The coating has excellent physical, chemical, and mechanical properties; (5) It can be brushed, rolled, and sprayed, and the tools are easy to clean. Due to the superior performance of water-based epoxy paint, and there is no danger of explosion and fire in tran...

AI Technical Summary

Problems solved by technology

[0003] Most of the existing water-based epoxy paints use epoxy emulsions as raw materials, but the hydrophilic effect of the emulsifier seriously affects the water resistance of epoxy paints, which limits the application of water-based epoxy paints