A kind of aqueous wood lacquer aqueous acrylate emulsion and preparation method thereof

Abstract

The invention discloses water-based acrylate emulsion for water-based woodware paint and a preparation method thereof. The water-based acrylate emulsion is prepared from the following materials in parts by weight: 0.1-5 parts of butyl acrylate, 10-30 parts of methyl methacrylate, 5-15 parts of iso-octyl acrylate, 3-15 parts of oligomer, 0.1-3 parts of an emulsifying agent, 0.1-5 parts of crosslinking monomer, 0.05-0.2 part of a chain transferring agent, 0.1-5 parts of carboxylic monomer, 0.1-0.3 part of persulfate, 1.4-3 parts of ammonia water, 0.1-5 parts of adipic acid dihydrazide and 43-67 parts of water. The preparation process comprises the steps of emulsifying, polymerizing and discharging. The preparation method disclosed by the invention has the advantages of simple equipment, convenience in operation, low cost and short period. The prepared emulsion has the characteristics of low film-forming temperature, high paint-film fullness and good cohesion resistance and has good application prospect in the field of the water-based woodware paint.

Description

technical field [0001] The invention relates to the technical field of emulsions and paints, and specifically refers to a water-based acrylate emulsion and a preparation method thereof. The emulsion is mainly used in the field of water-based wood lacquers, and is a paint film with low film-forming temperature and excellent fullness. and anti-adhesive acrylate emulsions. Background technique [0002] Water-based acrylate emulsion is widely used in the field of water-based wood lacquers because of its low price, good weather resistance and transparency. In most cases, water-based wood paints have certain requirements on the hardness of the acrylate emulsion. For general acrylic latex, the raising of hardness often means the rising of MFFT, thus needs more coalescent to help its film-forming, as the Chinese invention patent that application publication number is CN 104559604 A discloses a kind of water-based wood lacquer , is characterized in that it contains the following co...

AI Technical Summary

Problems solved by technology

For general acrylic latex, the raising of hardness often means the rising of MFFT, thus needs more coalescent to help its film-forming, as the Chinese invention patent that application publication number is CN 104559604 A discloses a kind of water-based wood lacquer , is characterized in that it contains the following components and mass proportion: 50% to 60% of aqueous acrylate emulsion, 1% to 1.5% of initiator, 2% to 5% of film-forming aid, 1% to 3% of Thickener, 15%-20% deionized water, 0.5%-2% defoamer, 1%-1.5% wetting agent, 0.2%-1% matting agent, 0.05%-1% preservative , which will not only increase the formulation cost, but also cause serious environmental pollution due to the fact that many coalescents used in the field of water-based wood paints are volatile organic compounds (VOCs).

Another method to reduce the MFFT of the emulsion is to adopt the core-shell polymerization process, which can reduce the MFFT of the emulsion to a certain extent. For example, the Chinese invention patent with the application publication number of CN 104448106 A discloses a core-shell type normal temperature automatic The production process of cross-linked acrylate emulsion adopts seed pre-emulsification semi-continuous core-shell emulsion polymerization process, introduces self-crosslinking monomer at room temperature, and synthesizes acrylate emulsion with hard core soft shell structure and self-crosslinking at room temperature that can be used for wood coatings , but its effect is limited and cannot fully meet the requirements, and the hardness of the emulsion prepared by this process will also decrease to a certain extent after film formation

The Chinese invention patent with application publication number CN 105061665 A discloses a hydroxyl polyacrylate emulsion and its preparation method and application. The preparation method is to weigh acrylate monomer and / or methacrylate monomer, hydroxyl acrylate Monomers, acrylic acid monomers, acrylate functional monomers, and hydroxyl oligomers are mixed uniformly to prepare a monomer mixture, and 10-15% of the monomer mixture is emulsified with an emulsifier to prepare a seed pre-emulsion for later use; the emulsifier, carbonic acid Add sodium hydrogen and deionized water into the reaction kettle, start stirring and increase the temperature of the reaction system, add the initiator, stabilize, drop the seed pre-emulsion, stabilize, and add the remaining monomer mixture and the remaining initiator after dripping , heat up, ripen, cool down, neutralize, cool down after heat preservation, and discharge the material to obtain a hydroxyl polyacrylate emulsion. The coating film of the water-based two-component polyurethane coating prepared by the hydroxyl polyacrylate emulsion and water-based polyisocyanate curing agent has high hardness and high hardness. Gloss and excellent chemical resistance, but due to the high average molecular weight of the water-based acrylate emulsion, the mobility of the molecular chain during the film-forming process is poor, resulting in unsatisfactory fullness, dry paint film and low gloss

Although the fullness of the paint film can be improved by adding a suitable wetting and leveling agent to the coating formulation, it will increase the cost of the formulation and reduce the applicability of the formulation

In addition, due to the wide molecular weight distribution of the acrylate emulsion, the polymer molecules are easily entangled, and due to its hot-sticky and cold-brittle characteristics, the paint film will Easy to become soft and sticky, resulting in unsatisfactory anti-adhesive properties

In some cases, the anti-blocking property of the paint film can be improved by adding additives such as wax emulsion to the paint formula, but the effect of this method is not long-lasting. Decreased adhesion

In addition, the addition of additives such as wax emulsion may have adverse effects on the storage stability of the coating

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