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    Home > Coatings News > Paints and Coatings Market > Coating knowledge: selection of epoxy resin for insulating powder coating of electromagnetic wire

    Coating knowledge: selection of epoxy resin for insulating powder coating of electromagnetic wire

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tip: in the 21st century, powder coating has become the mainstream of green coating with its advantages of environmental protection, cleaning, zero VOC release, easy assembly line operation, high efficiency and high performance

    Powder coating plays a more and more important role in the insulating materials used in electronics and motors

    The products are widely used in various fields such as motors, electronics, high-voltage electrical appliances, automobile industry, aviation machinery, etc

    However, insulating powder coating is still in its infancy in the field of electromagnetic wire coating, which shows that there are not many brands of products, and the overall performance of insulating powder coating is very different from that of solvent coating represented by polyimide, which restricts the insulating powder to a large extent Application scope and advantages of roller ceramic coating Recommended introduction: the surface of ceramic rubber plate used for roller ceramic coating is cast into durable rubber plate by hundreds of independent small ceramic pieces

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    Roller coating in extremely harsh working environment 2

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    It is suitable for leather Home of coatings: in the 21st century, powder coating has become the mainstream of green coating with its advantages of environmental protection, cleaning, zero VOC release, easy assembly line operation, high efficiency and high performance

    Powder coating plays a more and more important role in the insulating materials used in electronics and motors

    The products are widely used in various fields such as motors, electronics, high-voltage electrical appliances, automobile industry, aviation machinery, etc

    However, the insulating powder coating is still in the initial stage in the field of electromagnetic wire coating, which shows that there are not many product brands and the overall performance is far behind the solvent coating represented by polyimide, which to a large extent restricts the market promotion and application of insulating powder coating in this field

    In this paper, the insulating powder coating for electromagnetic wire (aluminum wire) coating which is currently used in the field of electrical machinery is studied

    The pure epoxy insulating powder coating product is prepared

    The softening and breakdown temperature can reach more than 150 ℃, which can partially replace the solvent insulating coating

    As we all know, pure epoxy powder coating has excellent insulation and corrosion resistance, which is closely related to the molecular chain structure of epoxy resin

    The hydroxyl group in epoxy resin has high polarity, which can form chemical bond with metal surface, so that the adhesion of the resin is excellent; the ether bond in molecular structure provides excellent chemical resistance and corrosion resistance, and its bending is also good; the propane group and benzene core give the epoxy resin heat resistance and Mechanical rigidity; Among them, epoxy group and hydroxyl group have reactivity, which can be cross-linked into a network structure when reacting with specific compounds

    At present, there are two main types of epoxy resin for powder coating in the market: bisphenol a type and o-cresol type

    Bisphenol a type epoxy resin, especially E-12 type, is widely used in the field of powder coating, with excellent comprehensive performance

    However, the epoxy functional groups in the sub chain of bisphenol a type epoxy resin are generally two, and the crosslinking density formed after crosslinking with curing agent However, o-cresol epoxy resin can have many epoxy functional groups, which can form a large cross-linking density after participating in the reaction, thus improving the heat resistance of the film, but also damaging the toughness of the coating to a certain extent

    The insulating powder coating for electromagnetic wire is different from the powder coating for motor stator and rotor

    It requires the coating to have excellent flexibility as well as insulation performance (Electrical and thermal properties)

    During the test, the bisphenol-A epoxy resin with epoxy equivalent of 700-900, the o-cresol-a epoxy resin with epoxy equivalent of 200-300 and the o-cresol-b epoxy resin with epoxy equivalent of 800-900 were used, the micronized dicyandiamide was used as curing agent, the 2-methyl-imidazole (2mi) was used as curing promoter, and the general leveling agent, benzoin, degassing agent and pigment were selected The effect of different types of epoxy resin on the properties of the coating film was compared

    The effect of epoxy resin type on the properties of powder coating O-cresol-a epoxy resin is too rigid and has poor compatibility with bisphenol-A epoxy resin

    Although it can greatly improve the heat resistance (softening and breakdown temperature) of the coating, it also seriously damages the flexibility of the coating

    Therefore, it is not suitable to be used as an insulating powder coating formula with high toughness requirements such as electromagnetic wire

    Epoxy resin B is a kind of phenolic resin with three functions

    Its rigidity is relatively small compared with epoxy resin A, but its toughness increases

    With the decrease of its addition, the coating toughness increases and the softening and breakdown temperature decreases

    When the ratio of epoxy resin 150 (bisphenol A) / 50, it can meet the toughness requirements of the coating film

    At this time, the softening and breakdown temperature rises to 142 C

    Therefore, in this study, bisphenol A epoxy resin E-12 and o-cresol epoxy resin B (E-12 / epoxy resin B = 150 / 50) were chosen as the resin system

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