High-hydroxyl vinyl chloride acrylate emulsion with core-shell structure

Abstract

The invention relates to the technical field of water-based acrylic emulsion, in particular to high-hydroxyl vinyl chloride acrylate emulsion with a core-shell structure. More hydroxyls need to be introduced into high-hydroxyl emulsion polymerization, the addition amount of hydrophilic monomers is large, the hydrophilic monomers are prone to water-phase homopolymerization and nucleation in emulsion polymerization to form insoluble substances, insoluble particles in an emulsion system are increased, emulsion stability is not facilitated, and adverse effects are generated on the performance of a paint film formed after curing. In order to solve the problems, the invention provides the high-hydroxyl vinyl chloride acrylate emulsion with the core-shell structure, a self-made prepolymer is added into a water-based emulsion system to replace part of water-based monomers, so that the addition amount of the water-based monomers is effectively reduced; and the prepolymer is a polymer which is obtained through a ring-opening reaction of acrylic acid and caprolactone and has double bonds and hydroxyl groups at the same time, the prepolymer can have certain hydrophobicity due to introduction of caprolactone, smooth emulsion polymerization is facilitated, and improvement of flexibility and gloss of a paint film in the later period is also facilitated.

Description

technical field [0001] The invention relates to the technical field of water-based acrylic emulsion, in particular to a high-hydroxyl vinyl chloride acrylate emulsion with a core-shell structure. Background technique [0002] In recent years, water-based resins have gradually replaced oil-based resins in some fields due to their low emissions and low pollution, such as industrial primers, topcoats, and textiles. [0003] The water-based varnish coated on the surface of wood, steel structure, etc. is a paint film obtained by water-based hydroxypropyl dispersion or water-based isocyanate two-component curing and cross-linking. The aqueous hydroxypropyl dispersion emulsion is the so-called high hydroxyl emulsion. [0004] There is a problem with high-hydroxyl emulsion polymerization. More hydroxyl groups need to be introduced into the formula, and the proportion of hydrophilic monomers is greatly increased. In the emulsion polymerization, hydrophilic monomers are easy to nucle...

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Problems solved by technology

[0005] Aiming at the problems existing in the prior art, the technical problem to be solved in the present invention is: more hydroxyl groups need to be introduced in the high-hydroxyl emulsion polymerization, the addition ratio of the hydrophilic monomer is greatly increased, and the hydrophilic monomer is prone to water phase in the emulsion polymerization. Homopolymerization nucleates to form insoluble matter, resulting in the increase of insoluble particles in the emulsion system, which is not conducive to the stability of the emulsion and has an adverse effect on the performance of the paint film formed after curing

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