Quick-drying core-shell structure hydroxy acrylic emulsion, preparation method and application thereof

Abstract

The invention discloses a quick-drying core-shell structure hydroxy acrylic emulsion, a preparation method and application thereof. The quick-drying core-shell structure hydroxy acrylic emulsion is obtained by two continuous emulsion polymerization on a core layer monomer and a shell layer monomer in a mass ratio of 1:(1-9), the core layer monomer is composed of methyl methacrylate, styrene, butylacrylate and ethylene glycol diacrylate, and the shell layer monomer is composed of methyl methacrylate, styrene, butyl acrylate, acrylic acid or / and methacrylic acid, hydroxypropyl acrylate or / and hydroxyethyl methacrylate, hydroxyethyl acrylate, isobornyl acrylate or / and isobornyl methacrylate or / and cyclohexyl acrylate or / and cyclohexyl methacrylate. A paint prepared from the hydroxyl acrylicemulsion provided by the invention has high drying speed, a formed paint film has high compactness, good corrosion resistance, and high glossiness and distinctness of image, and the emulsion can be applied to quick-drying acrylic polyurethane paint.

Description

technical field [0001] The invention relates to a quick-drying type core-shell structure hydroxyacrylic acid emulsion and its preparation method and application. Background technique [0002] Two-component acrylic polyurethane coatings have good decorative properties and anti-corrosion properties, and are widely used in heavy-duty anti-corrosion coatings, automotive coatings, wood coatings and other fields. In recent years, under the pressure of environmental protection, water-based acrylic polyurethane coatings have gradually replaced solvent-based acrylic polyurethane coatings, and have been widely promoted and applied. [0003] The two-component water-based acrylic polyurethane coating is composed of water-based hydroxyl acrylic resin (referred to as "hydroxypropyl resin") and isocyanate curing agent. Waterborne hydroxypropyl resin includes water dispersion type and emulsion type. Water dispersion type hydroxypropyl resin is a water dispersion formed by dispersing acryli...

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Problems solved by technology

[0004] However, the coating prepared by emulsion type hydroxypropyl resin contains more hydrophilic substances (such as: emulsifier, dispersant, wetting agent, etc.), and the latent heat of evaporation of water is relatively high, which makes the drying speed of the coating film very slow. slow

At present, the methods for improving the drying speed of coatings mainly include the following two methods: 1) increasing the amount of isocyanate curing agent added, but the price of curing agent is very high, and the increase in the amount of the curing agent will lead to a substantial increase in the cost of the coating; 2) increasing the T of the resin g , but high T g It will lead to insufficient cross-linking, which will eventually result in low gloss and poor sharpness of the coating film, which will reduce the decorative performance and anti-corrosion performance of the coating.

[0005] CN 101942269A, CN 102153691A, CN 102161770A and CN 102627720A all disclose the synthesis method of the hydroxypropyl resin aqueous dispersion used for quick-drying coatings, but all of them are aqueous dispersion type resins, the preparation process is complex, the cost is high, and High VOC content

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