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A kind of coating composition and its preparation method and coating and the method for protecting permanent magnetic material

A composition and coating technology, applied in coatings, polyurea/polyurethane coatings, etc., can solve the problems of large attenuation of magnetic properties of permanent magnet materials, poor resistance to salt spray, high baking and curing temperature, and achieve protection against Rust corrosion, stable and durable magnetic properties, excellent salt spray resistance and high temperature steam water resistance

Active Publication Date: 2020-07-10
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects that the existing Teflon coating has a high baking and curing temperature, has a great influence on the attenuation of the magnetic properties of permanent magnet materials, and the existing polyurethane coating has poor salt spray resistance, and provides a A new coating composition, a preparation method of the coating composition, a coating formed by curing the coating composition, and a method for protecting permanent magnetic materials

Method used

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  • A kind of coating composition and its preparation method and coating and the method for protecting permanent magnetic material
  • A kind of coating composition and its preparation method and coating and the method for protecting permanent magnetic material
  • A kind of coating composition and its preparation method and coating and the method for protecting permanent magnetic material

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Embodiment approach

[0015] The fluorine-modified hydroxyacrylic resin may be various existing hydroxyacrylic resins modified with fluorine-containing groups. According to a preferred embodiment of the present invention, the fluorine-modified hydroxyacrylic resin has a structure shown in formula (1):

[0016]

[0017] Among them, R 1 and R 3 each independently H or C 1 -C 5 straight-chain or branched-chain alkyl, R 2 and R 4 each independently is absent or C 1 -C 5 Linear or branched alkylene, n is an integer of 1-4, p is an integer of 300-500, and q is an integer of 300-500; preferably, R 1 and R 3 each independently H or C 1 -C 3 straight chain alkyl, R 2 and R 4 each independently is absent or C 1 -C 3 straight-chain alkylene, n is an integer of 2-3, p is an integer of 350-450, and q is an integer of 350-450. In addition, the number average molecular weight of the fluorine-modified hydroxyacrylic resin is preferably 20000-40000, more preferably 22000-38000, most preferably 250...

Embodiment 1

[0054] This example is used to illustrate the coating composition provided by the present invention and its preparation method.

[0055] The composition and weight percent of the coating composition described in the present embodiment are as follows:

[0056] Fluorine-modified hydroxyacrylic resin (Daikin GK570), 33% by weight; Epoxy-modified hydroxyacrylic resin (A102), 5% by weight; Blocked isocyanate (Bayer BL-3175), 22% by weight; Catalyst (organotin, T -12), 0.3% by weight; Silica (Grace C803, D90 is 6 μm), 4% by weight; Phosphate ester (Lubrizol 2063), 3% by weight; Butyl acetate, 30% by weight; Gusa 6#), 1.5% by weight; dispersant (BYK-163), 1.2% by weight.

[0057] The preparation process is as follows: Add half-butyl acetate, carbon black, epoxy-modified hydroxyacrylic resin and dispersant into the container and stir evenly, then use a grinder to grind into a color paste with a fineness of less than 15 μm, and then pour it into the color paste in turn Add fluorine-m...

Embodiment 2

[0059] This example is used to illustrate the coating composition provided by the present invention and its preparation method.

[0060] The composition and weight percent of the coating composition described in the present embodiment are as follows:

[0061] Fluorine-modified hydroxyacrylic resin (GK-580), 30% by weight; Epoxy-modified hydroxyacrylic resin (E-58), 8% by weight; Blocked isocyanate (BLR-8086), 22% by weight; Catalyst (organotin, T-12), 0.3% by weight; Silicon dioxide (Grace C803, D90 is 6 μm), 4% by weight; Phosphate ester (Changxing YX-909), 3% by weight; Butyl acetate, 30% by weight; Carbon black ( Degussa 6#), 1.5% by weight; Dispersant (BYK-163), 1.2% by weight.

[0062] The preparation process is as follows: add half of butyl acetate, carbon black, epoxy-modified hydroxyacrylic resin and dispersant into the container and stir evenly, then grind it into a color paste with a fineness of less than 15 μm, and then add fluorine to the color paste in sequence ...

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Abstract

The invention relates to the field of coating layers, and discloses a coating material composition as well as a preparation method and a coating layer thereof, and a method for protecting a permanentmagnetic material. The coating material composition is prepared from fluorine modified hydroxyl acrylic resin, epoxy modified hydroxyl acrylic resin, blocked isocyanate, a catalyst and a solvent, wherein the content of a hydroxyl group in the fluorine modified hydroxyl acrylic resin is 1 weight percent or above, the content of the hydroxyl group in the epoxy modified hydroxyl acrylic resin is 2 weight percent or above, and the content of isocyano in the blocked isocyanate is 5 weight percent or above. The coating layer obtained by the coating material composition provided by the invention is very good in salt spray resistance and very good high temperature steam water performance; the curing temperature is just 130 to 140 DEG C, so that the coating material composition is suitable for allkinds of existing permanent magnetic materials, cannot affect the magnetic performance of the permanent magnetic materials and has an industrial application prospect.

Description

technical field [0001] The invention relates to the field of coatings, in particular to a coating composition, a preparation method of the coating composition, a coating formed by curing the coating composition and a method for protecting permanent magnetic materials. Background technique [0002] At present, the permanent magnet materials used in electric vehicles are very easy to corrode and rust in the environment of high temperature, high humidity and salt spray, which will lead to the decline of the performance of permanent magnet materials and seriously affect the service life of electric vehicles. At present, the commonly used anti-corrosion technology is spraying Teflon or polyurethane coating to protect the permanent magnet material. By uniformly spraying a layer of 20-35μm coating on the surface of the permanent magnet material to isolate salt spray and moisture, the permanent magnet material can be extended. service life. Among them, the anti-corrosion performanc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D175/04C09D7/61C09D7/65
CPCC08L2205/025C08L2205/035C09D175/04C08L75/04C08L85/02C08L33/02C08L27/18C08K13/02C08K3/04C08K3/36
Inventor 刘萌
Owner BYD CO LTD
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