Silica sol hybrid hydroxyl acrylate emulsion and preparing method thereof

Abstract

The invention relates to a silica sol hybrid hydroxyl acrylate emulsion and a preparing method thereof. A semi-continuous seed emulsion polymerization method is adopted, a hard monomer serves as a core, hard and soft monomers and a hydroxyl acrylatemonomer serve as a housing, organic silane is added into the housing to conduct modification, emulsifiers are all reactive emulsifiers, a sulfonate-modified HDI curing agent (Aquolin-268) of Wanhua Company is selected, and the ratio of the reactive emulsifiers tothe sulfonate-modified HDI curing agent is 10:1. The hardness of film reaches 3H, the silica sol hybrid hydroxyl acrylate emulsion is high in gloss and adhesive force and excellent in water resistance and alcoholresistance, and all other physical and chemical propertiescan meet nationalstandard requirements.

Description

technical field [0001] The invention relates to a preparation method of an emulsion for water-based wood paint, and specifically provides a silica sol hybrid hydroxyacrylate emulsion and a preparation method thereof. Background technique [0002] Acrylate emulsion has the advantages of low cost, good weather resistance, high gloss, and water-based environmental protection. It is the fastest-growing environmental-friendly coating adhesive for water-based coatings. The waterborne two-component acrylate polyurethane coating is composed of a hydrophilic modified -NCO-containing low-viscosity polyisocyanate curing agent and -OH-containing waterborne polyacrylate polyol. The water-based hydroxyacrylic emulsion has adjustable polymer structure, designable emulsion particle configuration, and can also be endowed with various functional designs. Due to the diversity, adjustability and designability of hydroxyl resin, the two-component acrylate polyurethane coating has high performan...

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Problems solved by technology

[0003] The application number is 201710102922.7, which discloses a method for preparing a core-shell structure hydroxyl acrylic emulsion, which effectively combines acrylic monomer pre-emulsification technology, seed emulsion polymerization technology, core-shell emulsion polymerization technology, self-crosslinking emulsion polymerization technology, and emulsion polymerization technology. In combination, the monomer pre-emulsification of the seed emulsion polymerization part, the direct dripping of the monomer of the core emulsion polymerization part and the pre-emulsification of the monomer of the shell emulsion polymerization part are adopted, and different initiators are selected in the core-shell emulsion polymerization process and drop rate, and the core shell is selected from anionic emulsifiers and nonionic emulsifiers with different properties to effectively control the particle size and distribution of the emulsion; in the case of no or only a small amount of gelation during the synthesis process, the emulsion The emulsifier added in the synthesis accounts for less than 6% of the total amount of acrylic monomers (accounting for less than 3% of the total amount of the synthesized emulsion), but this kind of latex mainly has low hardness, poor gloss and fullness

[0004] Silica sol is a dispersion of nano-silica in water, which contains a large number of hydroxyl groups. When silica sol loses water, monomeric silicic acid gradually polymerizes into high-polymer silica gel. With the evaporation of water, the colloidal molecules increase and finally form -SiO-O-SiO- coating film, due to Na 2 The content of O in silica sol is low. Silica sol has a certain amount of film-forming and dissolving characteristics. Its wear resistance, heat resistance, and hardness are significantly better than organic coatings. The coating film is dense and hard, and does not generate static electricity. This kind of dust is difficult to adhere to, but silica sol has the disadvantages of large volume shrinkage during film formation and easy cracking of the coating film

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