A kind of hydroxyl acrylic acid emulsion with core-shell structure and its preparation method and application

Abstract

The invention discloses a hydroxyl acrylic emulsion with a core-shell structure, and a preparation method and an application thereof. The emulsion is obtained through emulsion polymerization of five alkene monomers in the presence of an initiator and an emulsifier, and the five alkene monomers comprise, by weight, 40-65% of an alkene monomer containing no other functional groups, 5-30% of an alkene monomer containing a hydroxyl group, 2-5% of an alkene monomer containing an epoxy group, 1-7% of an alkene monomer containing a carboxyl group, and 1-3% of a polyfunctional alkene monomer with the functionality being not smaller than 2; the use amount of the initiator is 0.2-1.5 wt% of the total amount of the monomers; and the use amount of the emulsifier is 1-5 wt% of the total amount of the monomers. An aqueous two-component coating prepared from the hydroxyl acrylic emulsion and an aqueous cross-linking agent has the advantages of low content of VOCs, high content of solids, realization of good hardness and good flexibility combination of a film formed by the coating, and excellent various resistances, and can be used in aluminum section coating to substitute traditional solvent type coatings.

Description

technical field [0001] The invention relates to the field of coatings, more specifically, to a hydroxyacrylic acid emulsion with a core-shell structure and a preparation method and application thereof. Background technique [0002] Aluminum and its alloys have the advantages of good corrosion resistance, electrical and thermal conductivity, and easy processing and forming, so aluminum alloys are widely used in the fields of national defense, aerospace, transportation instruments, machinery and electronic devices, and home decoration. However, because metal aluminum is easily oxidized and blackened, which affects its appearance and service life, it is very necessary to protect and decorate aluminum alloy workpieces. [0003] In the industry, solvent-based coatings and powder coatings are usually used to coat the surface of aluminum profiles for protection and decoration. However, oil-based coatings often release toxic and harmful organic compounds (VOC) such as benzene and al...

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Problems solved by technology

[0004] Chinese patent CN 105038426A discloses a high-solid, low-VOC benzene-free solvent-based acrylic resin. The resin is prepared by polymerization using butyl acetate and propylene glycol methyl ether acetate as solvents. Although the resin is a benzene-free system, it has a low VOC, but compared with water-based emulsions, VOC emissions are still larger

Although the emulsion can be cured at room temperature, various resistances have also been improved to a certain extent, but its overall performance is worse than that of thermosetting emulsions, and it cannot be used on metal baking varnishes. Chinese patent CN104293047A discloses a kind of acrylic amino baking varnish. Amino resin curing makes the paint film have good hardness, adhesion, impact resistance and weather resistance, but the paint film cured by amino resin is poorer in fullness and flexibility than the paint film cured by polyurethane, and the curing temperature of polyurethane is lower

Chinese patent CN200510134997.0 discloses an emulsion-type hydroxyacrylic resin with a core-shell configuration. The resin introduces hydroxyl groups and can be used as a hydroxyl resin for two-component coatings. However, due to the limitations of the polymerization process and raw material selection, its tolerance is not good. To a higher improvement, it is difficult to satisfy the outdoor coating with higher resistance

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