Room-temperature self-crosslinking wood lacquer emulsion and preparation method thereof

Abstract

The invention relates to a room-temperature self-crosslinking wood lacquer emulsion which is characterized by being prepared from the following components: methyl methacrylate, styrene, butyl acrylate, diacetone-acryloamide, glycidyl methacrylate, methacrylic acid, polycarbodiimide resin, adipic dihydrazide, an emulsifier, an initiator, a neutralizer, a molecular weight regulator and deionized water. The preparation method comprises the following steps: adding 10-50% of emulsifier aqueous solution into a reaction kettle, stirring and raising the temperature; in an emulsifying kettle, sequentially adding monomer materials into the residual emulsifier aqueous solution in a high speed disperse state and stirring; then, adding 5% of monomer pre-emulsion into the reaction kettle, adding an initiator solution, and starting to add the residual emulsion and initiator solution dropwise when the temperature of the reaction kettle reaches 80 DEG C, and then starting cooling the reaction kettle; and adding the neutralizer, adipic dihydrazide and polycarbodiimide resin into the reaction kettle, stirring for 30-40 minutes and filtering and packaging. According to the room-temperature self-crosslinking wood lacquer emulsion provided by the invention, cross-linking reaction of diacetone-acryloamide and adipic dihydrazide, polycarbodiimide resin and methacrylic acid is adopted, and the double crosslinking reaction is of great benefit to enhancing the adhesive property of a film.

Description

technical field [0001] The invention belongs to the technical field of coatings, in particular to a room temperature self-crosslinking wood paint emulsion and a preparation method thereof. Background technique [0002] At present, the development trend of water-based wood lacquers is environmental protection and high performance. With the increasingly stringent national environmental protection regulations, water-based wood lacquers will gradually replace solvent-based wood lacquers. However, my country's water-based wood coatings still have limitations in key technologies, resulting in a certain gap between their paint films and solvent-based coatings in terms of hardness, water resistance, and stability. The most widely used acrylate emulsion in water-based wood lacquers is "hot sticky and cold brittle" due to its low cross-linking density. During use, it is easy to scratch, bruise, crack, foam, wrinkle or even fall off. The fundamental reason is that acrylate emulsion is...

AI Technical Summary

Problems solved by technology

However, my country's water-based wood coatings still have limitations in key technologies, resulting in a certain gap between their paint films and solvent-based coatings in terms of hardness, water resistance, and stability.

The most widely used acrylate emulsion in water-based wood lacquers is "hot sticky and cold brittle" due to its low cross-linking density. During use, it is easy to scratch, bruise, crack, foam, wrinkle or even fall off.

The fundamental reason is that acrylate emulsions are thermoplastic resins with high film-forming temperature, low-temperature coating films are brittle, and have poor hardness, especially in the initial stage of poor anti-sticking properties, so they are not suitable for preparing high-quality wood coatings.

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