Water-based nano insulating paint as well as preparation method and application thereof

Abstract

The invention provides water-based nano insulating paint as well as a preparation method and application thereof, and relates to the technical field of water-based insulating paint. The water-based nano insulating paint is prepared from the following raw materials in parts by weight: 75 to 142 parts of solid epoxy resin, 15 to 30 parts of an emulsifier, 18 to 45 parts of a coalescing agent, 38 to 105 parts of water, 5.5 to 20 parts of a closed curing agent and 0.5 to 4 parts of an anti-sagging agent, the solid epoxy resin is bisphenol A type epoxy resin, and the molecular weight of the bisphenol A type epoxy resin is 1000 to 10000 g / mol; the emulsifier is a nonionic reaction type epoxy resin emulsifier. The insulating paint has the advantages of high insulation grade, high temperature and high pressure resistance, stretching and bending resistance, good adhesiveness, excellent chemical resistance and the like.

Description

technical field [0001] The invention relates to the technical field of water-based insulating varnish, in particular to a water-based nano insulating varnish and a preparation method and application thereof, in particular to a water-based insulating varnish for preparing enamelled winding wires. Background technique [0002] Insulating varnish is a kind of paint with electrical insulation. The insulating varnish is coated on the surface of various bare metal electromagnetic circles, flat wires, metal conductors, electrical steel strips, laminates and other substrates to form an insulating coating. Felt, felt rollers and other equipment, after one or more layers of coating, and then quickly solidified at a high temperature above 280°C to form a dense insulating layer, thereby protecting conductive materials from mechanical damage and chemical corrosion, and prolonging the service life of the product. Improve the safety of use. High-performance insulating varnish requires uni...

AI Technical Summary

Problems solved by technology

[0003] At present, most high-performance insulating varnishes on the market are oil-based insulating varnishes, and are dominated by imported or foreign brands, which are expensive, have a strong smell, and are not environmentally friendly

Traditional oil-based insulating paints are mainly polyester, polyurethane and imine modified products, usually containing organic solvents, such as dimethylformamide, N-methylpyrrolidone, imide or imide, toluene, xylene and other strong irritants In the process of using oil-based insulating varnish to prepare electromagnetic wire, a large amount of irritating gas will be released, which seriously endangers human health and pollutes the environment.

[0004] Based on the above-mentioned problems of oil-based insulating varnish, there are some water-based insulating varnishes, such as water-based polyamide-imide system, water-soluble polyester-amino system, etc., but the degree of productization is low, the cost is high, and there are problems such as poor performance. , such as low insulation grade, poor toughness and high brittleness of the coating, weak tensile and bending resistance, normal hammering of the insulation layer on the A and B sides of the electromagnetic flat wire or thermal shock cracking above 220 ° C, and uneven curing Not dense, coating bubbles and pinholes exceed the standard, etc.

The water-based polyamide-imide system has a strong odor, and the cost is higher than that of traditional oil-based insulating varnishes; the disadvantages of other water-soluble polyester systems include resistance to hydrolysis, easy demulsification, easy layering and precipitation, and low boiling point co-solvent (VOC) content Large, excessive release of formaldehyde during thermal curing of amino groups, slow curing speed, etc.

[0005] There is also a type of powder insulating varnish on the market, which is electrostatically sprayed on the surface of magnetic materials and flat metal insulators, but this type of insulating varnish and preparation process are difficult to achieve on electromagnetic round, flat wires or irregular conductors, and the coating has different insulation levels. High, large particle size, many pinholes, tortuous and easy to crack, low voltage resistance and high temperature impact ability, etc.

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