Polyacrylate copolymer leveling agent, and preparation method and application method thereof in enameled wire enamel

Abstract

The invention discloses a polyacrylate copolymer leveling agent, and a preparation method and an application method thereof in enameled wire enamel. The leveling agent consists of a component A, a component B, a component C, a component D and a component E, wherein the component A is an acrylate monomer with the carbon atom number of 4-18; the component B is an acrylic or acrylate monomer containing carboxyl groups or hydroxyl groups; the component C is a hyperoxide or azo free radical initiator; the component D is a molecular weight modifier; the component E is a solvent; the added quantity of each component in mass is as follows: the component A accounts for 100 parts, the component B accounts for 5-30 parts, the component C accounts for 0.1-1% of the sum of the component A and the component B, the component D accounts for 0.3-3% of the sum of the component A and the component B, and the component E accounts for 100-160% of the sum of the component A and the component B. The leveling agent has the advantages of high leveling speed and good temperature resistance. The preparation method comprises two preparation methods of solution polymerization and bulk polymerization and solution diluting. The application method in enameled wire enamel mainly comprises the step of adding the leveling agent, which accounts for 0.5-2.5% of the total mass of the enameled wire enamel, into the enameled wire enamel.

Description

technical field [0001] The invention relates to a polyacrylate copolymer leveling agent, in particular to a polyacrylate copolymer leveling agent with fast leveling speed and good temperature resistance, a preparation method thereof and an application method in wire enamel. Background technique [0002] Leveling agent is a commonly used coating additive, which can promote the formation of a flat, smooth and uniform coating film during the drying and film forming process of the coating. With the improvement of people's requirements for the appearance of coatings, the amount and variety of leveling agents are also increasing, and the consumption is increasing year by year. [0003] In the production process of enameled wires, most of the insulating varnishes used for enameled wire coating are solvent-based varnishes, that is, resins are dissolved in solvents. Or paint the mold, so that the bare copper wire with a circular cross-section is evenly coated with a layer of paint l...

AI Technical Summary

Problems solved by technology

[0006] One is that during the enameled wire production process, the moving speed of the enameled wire in the oven is as high as tens of meters or even hundreds of meters per minute, and the residence time in the oven is only a few seconds or a dozen seconds, and the leveling time is short. The existing polyacrylate The speed at which the leveling agent migrates to the surface of the coating to form a monomolecular layer is still difficult to meet the requirements of high-speed enameled wire coating, that is, the existing polyacrylate leveling agent has a slow leveling speed and cannot better meet the high-speed coating and curing of enameled wire. Require

[0007] The second is that the temperature resistance of acrylate polymers is worse than that of the base resins of coatings such as polyurethane and polyester imine, and it is difficult to adapt to enameled wires working under long-term high temperature conditions.

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