A carbon fiber thermosetting powder electromagnetic shielding coating

A technology of electromagnetic shielding coatings and thermosetting powders, applied in powder coatings, polyester coatings, epoxy resin coatings, etc., can solve the problems of poor shielding effect, easy to be oxidized, easy to produce precipitation, etc., and achieve poor improvement effect , specific gravity reduction, and the effect of not being easily oxidized

Active Publication Date: 2018-03-20
ANHUI SHENJIAN NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In the world, silver-based shielding coating products are relatively mature, and their price is expensive. It is difficult for general use to bear the shortcomings caused by the high cost, and there are fundamental defects in silver-based products: the product is prone to precipitation after compounding, accompanied by The phenomenon of migration occurs. Although the research has progressed in recent years, no real industrialized mature products have been widely used in production practice (Zhao Bin et al., Application of ultra-fine silver powder in conductive coatings, Coating Technology, 2000, (1): 40); Nickel-based shielding coatings are currently sold in the market in a certain amount, but the shielding effect is not good in the low-frequency region below 30MHz, and due to poor electrical conductivity, the shielding efficiency is low, but it is currently the leading product for shielding coatings; copper-based shielding coatings shield High efficiency and price advantage, and there is no problem of silver migration affecting coating performance, so copper-based products are gradually developed, but the main problem is unstable performance due to the easy oxidation of copper

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A carbon fiber thermosetting powder electromagnetic shielding coating, its raw materials and parts by mass are: 0.309 parts of polyacrylonitrile-based carbon fiber, 0.54 part of cationic polyacrylamide, 0.2 part of sodium carboxymethyl cellulose, mixed resin (polyester resin: epoxy resin Ratio 1:1, Anhui Shenjian New Materials Co., Ltd., mixed epoxy cured polyester resin, SJ3A) 52.4 parts, silver-coated copper powder (Shenzhen Lihongjin Technology Co., Ltd., Li-0103) 9.6 parts, nickel Powder (Beijing Xinrongyuan Technology Co., Ltd., 300 mesh high-purity nickel powder) 8.3 parts, leveling agent (Modaflow Powder III, US SOLUTIA, N-(1,3-DIMETHYLBUTYL)-N'-PHENYL-P-PHENYLENEDIAMINE) 2.4 parts , titanate coupling agent (Nanjing Youpu Chemical Co., Ltd., isopropyl triisostearate titanate, UP-130) 1.57 parts, composed of water, polyethoxy octylphenol ether, ethyl carbitol 37.8 parts of a mixed solvent with a mass ratio of 1:1:1, and 0.003 parts of tris(2,4-di-tert-butyl)phenyl...

Embodiment 2

[0046] A carbon fiber thermosetting powder electromagnetic shielding coating, its raw materials and parts by mass are: 0.505 parts of polyacrylonitrile-based carbon fiber, 1.65 parts of cationic polyacrylamide, 1.0 part of sodium carboxymethyl cellulose, mixed resin (polyester resin: epoxy resin Ratio 7:3, Anhui Shenjian New Materials Co., Ltd., mixed epoxy cured polyester resin, SJ6A) 44.4 parts, silver-coated copper powder 5.7 parts, nickel powder 11.5 parts, leveling agent 2.1 parts, titanate couple 1.15 parts of joint agent, 19.8 parts of mixed solvent composed of water, polyethoxy octylphenol ether, and ethyl carbitol at a mass ratio of 1:1:1, bis(2,4-di-tert-butylphenyl) 0.004 parts of pentaerythritol diphosphite.

[0047] The polyacrylonitrile-based carbon fiber has a length of 0.5-1 mm;

[0048] The volume percentage of silver in the silver-coated copper powder is 15%, and the particle size is 38-53 μm;

[0049] The particle size of the nickel powder is 38-53 μm;

...

Embodiment 3

[0059] A carbon fiber thermosetting powder electromagnetic shielding coating, its raw materials and parts by mass are: 0.489 parts of polyacrylonitrile-based carbon fiber, 2.06 parts of cationic polyacrylamide, 1.0 part of sodium carboxymethyl cellulose, mixed resin (polyester resin: epoxy resin Ratio 3:2, Anhui Shenjian New Materials Co., Ltd., mixed epoxy cured polyester resin, SJ5A) 60.3 parts, silver-coated copper powder 10.2 parts, nickel powder 26.5 parts, leveling agent 5.1 parts, titanate couple 1.97 parts of joint agent, 40.1 parts of mixed solvent composed of water, polyethoxy octylphenol ether, and ethyl carbitol at a mass ratio of 1:1:1, bis(2,4-di-tert-butylphenyl) 0.004 parts of pentaerythritol diphosphite.

[0060] The polyacrylonitrile-based carbon fiber has a length of 0.5-1 mm;

[0061] The volume percentage of silver in the silver-coated copper powder is 30%, and the particle size is 38-53 μm;

[0062] The particle size of the nickel powder is 38-53 μm;

...

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Abstract

The invention discloses a carbon fiber thermosetting powder electromagnetic shielding coating. The raw materials and mass parts are: 3-5 parts of carbon fiber, 0.05-2 parts of cationic surfactant, 0.1-1 part of anti-sedimentation dispersant, 0.15-1.6 part of curing agent, 20-60 parts of mixed resin, 1-10 parts of silver-coated copper powder, 5-25 parts of nickel powder, 1-5.5 parts of leveling agent, 1-2.5 parts of titanate coupling agent, 20-45 parts of mixed solvent, anti Oxidizing agent 0.001‑0.005 parts. The invention pioneers the use of carbon fiber in thermosetting powder electromagnetic shielding paint, which reduces the amount of precious metal silver and other shielding metals, improves the poor shielding effect in low frequency regions, and greatly reduces the specific gravity of the paint.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic shielding paint, in particular to a carbon fiber thermosetting powder electromagnetic shielding paint. Background technique [0002] Human beings have entered the era of information technology. With the advancement of science and the rapid development of the electronics and electrical industries, the number of various commercial and household electronic products has increased sharply, radiation is pervasive, and electromagnetic interference is becoming more and more serious. Electromagnetic radiation interference has become one of the pathogenic sources that endanger human health today; at the same time, signal mutual interference between electronic appliances has also become a key issue for product safety and reliability. [0003] As early as 1969, the United Nations Conference on the Human Environment listed electromagnetic radiation as "the main pollutants that must be controlled to cau...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09D167/00C09D163/00C09D5/03C09D7/61
Inventor 孙益民刘志坚吴德清
Owner ANHUI SHENJIAN NEW MATERIALS
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