The story behind the water-based insulating paint

Insulation paint, also known as insulation paint, is a coating with excellent electrical insulation. It has good electrochemical performance, thermal performance, mechanical properties and chemical properties, mostly varnish, but also color paint. Insulated paint is a kind of special paint

. Insulation paint is an important insulation material based on polymer polymers that can be cured into insulating film or insulator under certain conditions. At present, all kinds of domestic motor production enterprises use the traditional solvent-based insulation paint, all contain a large number of benzene, ketone esters and other flammable and explosive toxic solvents, after construction issued a large number of harmful substances, threatening human health and causing environmental pollution, so gradually replaced by water-based insulation paint. In order to reduce the emission of organic solvents, to achieve low VOC national environmental protection requirements, in recent years, many domestic institutions to focus on the development of water-based insulation paint. Insulation paint consists of substations, flame retardants, curing agents, pigments, and solvents. This article will introduce water-based insulation paint and its development.
introduction of water-based insulation paint
water-based insulation paint refers to water as the main solvent insulation paint, water-based insulation paint including water-soluble and water-milk two categories.
Water-based insulation paint mainly has the following problems:
1, as the main body of water-based insulation paint, water-based polymer itself needs to have a large number of polar groups, ion-based groups or with the emulsification of these groups to dissolve or disperse in water, these groups should be reduced to a very low level in the process of insulation paint curing, otherwise in a humid environment hydrolysis will seriously affect the insulation and anti-mold properties of the paint film.
2, due to the corrosion of metal by water or ion groups, often constitute damage to the insulation treatment object containing metal parts. Reasonable use of anti-flash technology to a certain extent to solve the water-based insulation paint on metal parts corrosion, but will also reduce the insulation properties of curing.
3, must have a certain mechanical strength, especially at high temperatures to maintain a certain bonding strength, otherwise, under the role of electromagnetic force and mechanical stress, may cause the winding loose or deformation, causing accidents;
2. The development of water-based insulating paint
1, alkyd resin type water-based insulation paint
alkyd resin type insulation paint is the largest use of a class of insulation paint, commonly used trihydroxymethyl propane, new glycol, ethylene glycol and oocylic acid, benzene and other reactions to make water-soluble Base resin, and then methanol etherized water-soluble melamine formaldehyde resin as cross-linking agent curing, access to water-based alcoholic acid resin insulation paint, but because the heat resistance of alcoholic acid is not high, the resistance to wear voltage is not strong, but aleic acid is cheap and easy to obtain, so mainly used in small and medium-sized low-voltage electrical appliances insulation treatment.
to the oil, shunbutene date, trihydroxymethyl propane as raw materials, the preparation of oleic acid resin, and then through silicon correction, the preparation of electrical insulation strength 130MV / m comprehensive performance of good water-based insulation paint.
2, water-based polyester insulation paint
water-based polyester synthesis method and water-based alcoholic acid resin is basically similar, but water-based polyester introduced more heat-resistant aromatic acid, so electrical insulation is also superior to water-based alcoholic acid resin, due to excellent thermal insulation, water-based polyester can be used as the current F-grade and above water-based insulation paint. Water-based polyester is generally introduced into the polyester resin structure in the process of synthesis, using binary acid, binary alcohol, triol, benzodialycerine and other raw materials with two-step method of dissolved polymerization method to synthesize polyester, cooling and then added to the positive butanol solid content of nearly 80% solution. Add DMEA neutral, dilute with water-based polyester for use in silicon steel sheet paint. The comprehensive performance of the prepared water-based polyester paint film is good, and it is a good silicon steel sheet paint.
3, water-based epoxy insulation paint
the mechanical strength of epoxy paint, excellent electrical performance, chemical resistance, good moisture resistance, small shrinkage, and other materials bonding, good compatible, but high price. For some special needs and use high molecular weight solid epoxy resin as the main component of insulation paint, more solvents need to be added to obtain easy impregnation of low viscosity insulation paint, so epoxy resin water-based for environmental protection, improve the working environment, reduce costs are of great significance.
4, water-based polyimide insulation paint
polyimide (PI) refers to the main chain containing polyimide ring of a class of polymers, is a high-performance polymer with excellent thermal stability, outstanding electrical properties and good electrical properties. Most of these materials are made by further dehydration of the exosome polyamide acid (PAA).
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