Method for preparing emulsion for self-crosslinked waterborne wood coating

Abstract

The invention discloses a method for preparing emulsion for a self-crosslinked waterborne wood coating. The emulsion comprises a component A and a component B. The method is characterized in that the preparation process comprises the following steps of a, for the component A, preparing acrylic resin with a high acid value containing air dry vegetable oil fatty acid composition, wherein the acid value is 180-240mgKOH / g; b, for the component B, preparing the acrylic resin with a high hydroxyl value, wherein the hydroxyl value is 120-260mgKOH / g; c, carrying out esterification reaction between the acrylic resin (component A) with the high acid value and the acrylic resin (component B) with the high hydroxyl value, neutralizing with ammonia (or amine) and diluting with water after the acid value is qualified, so as to obtain the emulsion C for the self-crosslinked waterborne wood coating. The emulsion can be used for preparing the self-crosslinked waterborne wood coating. The paint is low in VOC (volatile organic compound) content, accords with the environmental protection requirement, belongs to the environment friendly type, and can be widely applied to furniture coating and house decoration.

Description

technical field [0001] The invention relates to the paint industry in the field of chemical industry, in particular to a preparation method of water-based acrylic emulsion paint, and the emulsion is suitable for making water-based wood paint. Background technique [0002] Wood coatings not only have a decorative and beautifying effect, but also have a good protective effect on wood, which can prolong the service life of wood. The wood coatings currently on the market are mainly solvent-based. Common varieties are alkyd coatings, acrylic coatings, nitro coatings and two-component polyurethane coatings. The volatile organic compound (VOC) content of these coatings exceeds 50wt%. During production and construction, these VOCs volatilize into the atmosphere, which is not only harmful to the health of production sites and construction personnel, but also pollutes people's living, working and studying. environment of. [0003] With the increasingly stringent restrictions on VOC...

AI Technical Summary

Problems solved by technology

Although alkyd water-based wood coatings have good film-forming properties, high gloss, and good decorative properties, the coating film dries slowly, has low hardness, and poor yellowing resistance, and the coating is prone to hydrolysis during storage and has poor storage stability; polyurethane Although water dispersion wood coatings have high fullness, good toughness, and good decorative properties, the coating film has low hardness, poor water resistance, and is expensive; acrylic emulsion wood coatings have fast drying, good weather resistance, and gloss and color retention. Excellent, and the price is relatively low, so it is the most commonly used in water-based wood coatings. However, the acrylic emulsion wood coatings currently on the market still have the following disadvantages: 1. The coating film is soft and the sanding property is poor; 2. The poor permeability to the substrate makes the adhesion between the coating film and the substrate insufficient after film formation; 3. Acrylic emulsion mainly relies on physical film formation, and the water resistance and solvent resistance of the coating film are poor, and the coating film " The phenomenon of hot stickiness and cold brittleness is serious; 4. The gloss of the coating film is low and the fullness is poor

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