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Conducting paint

A conductive coating and functional technology, applied in conductive coatings, epoxy resin coatings, coatings, etc., can solve problems such as difficult dispersion, poor resin compatibility, and unsatisfactory conductive fillers

Active Publication Date: 2013-03-20
NINGBO GRAPHENE INNOVATION CENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are two main deficiencies in the preparation technology of existing conductive coatings: the one is that the conductive filler is not ideal enough. Although the silver-based conductive property is better, the price is expensive and the phenomenon of silver migration is easy to occur; the copper-based filler is low in price and good in conductivity. The shielding effect is good, but the anti-oxidation stability is extremely poor, and special treatment is required; the performance of nickel-based fillers is more stable than that of copper, and the conductivity is an order of magnitude lower than that of copper-based fillers. The shielding effect is not obvious, and the anti-oxidation stability is slightly poor; the price of conductive carbon black filler is extremely low, the chemical stability is good, and the dispersion is good, but the conductivity is more than 3 orders of magnitude lower than that of copper, and most of them are used for conductivity requirements. In low occasions, the effect of shielding paint is not very ideal
The publication number is CN101508855A Chinese patent discloses a water-based graphite conductive coating and its preparation method, its adhesion is 2~3 grades, the volume resistivity of the coating is 0.2~0.35Ω·cm, and the adhesion is poor
However, using graphene alone as a conductive filler for conductive coatings has problems such as difficulty in dispersion, poor compatibility with resins, and poor wet adhesion. Therefore, it is of great significance to develop a conductive coating with good conductivity and excellent adhesion.

Method used

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  • Conducting paint

Examples

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preparation example Construction

[0041] The preparation method of the conductive coating is not particularly limited in the present invention, and it can be a preparation method well known to those skilled in the art. In order to make the conductive paint of the present invention have better performance, the preparation method of described conductive paint is preferably prepared by the following method:

[0042] Mixing the solvent, wetting and dispersing agent and defoamer, and stirring to obtain the first mixed solution; mixing graphene and functionalized graphene with the first mixed solution, and sanding after stirring to obtain the material; After stirring, mix with epoxy resin curing agent to obtain component A; mix epoxy resin with component A to obtain conductive coating.

[0043] The invention provides a conductive coating, which comprises: 1wt%~8wt% graphene, 0.1wt%~1wt% functionalized graphene, 15wt%~30wt% epoxy resin and curing agent, 0.2wt%~ 1.5wt% wetting and dispersing agent, 0.1wt%~0.5wt% defo...

Embodiment 1

[0047] 1) At a speed of 400r / min, add 62.5 parts by weight of tap water, 0.15 parts by weight of BYK-190 wetting and dispersing agent produced by BYK Company, 0.15 parts by weight of Hydropalat3275 wetting and dispersing agent produced by Shenzhen Haichuan Chemical Co., Ltd., TEGO 0.2 parts by weight of Foamex825W defoamer produced by the company, stirred for 5 minutes;

[0048] 2) Adjust the rotation speed to 2500r / min, slowly add 6 parts by weight of graphene and 1 part by weight of aminated graphene produced by Yoshikura Nano Co., Ltd. to the solution obtained in step 1), stir evenly and put it on a sand mill for sand grinding 60min;

[0049] 3) Move the sanded material to a high-speed mixer, and adjust the speed to 600r / min, and add 10 parts by weight of BH520 epoxy curing agent produced by Dongguan Heima Chemical to obtain component A;

[0050] Component B is the BH653 epoxy resin of 20 parts by weight produced by Dongguan Heima Chemical Industry;

[0051] When using, j...

Embodiment 2

[0053] 1) At a speed of 400r / min, add 63.4 parts of tap water, 0.15 parts by weight of BYK-190 wetting and dispersing agent produced by BYK Company, and 0.15 parts by weight of Hydropalat3275 wetting and dispersing agent produced by Shenzhen Haichuan Chemical Co., Ltd., produced by TEGO Company 0.2 parts by weight of Foamex825W defoamer, stirred for 5min;

[0054] 2) Adjust the rotation speed to 2500r / min, and slowly add 6 parts by weight of graphene to the solution obtained in step 1), 0.1 parts by weight of aminated graphene produced by Yoshikura Nano Co., Ltd., stir evenly and place it on a sand mill for 60 minutes. ;

[0055] 3) Move the sanded material to a high-speed mixer, adjust the speed to 600r / min, and add 10 parts by weight of BH520 epoxy curing agent produced by Dongguan Heima Chemical to obtain component A.

[0056] Component B is 20 parts by weight of BH653 epoxy resin produced by Dongguan Heima Chemical Industry.

[0057] When using, just mix components A and...

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Abstract

The invention provides a conducting paint which comprises 1-8 wt% of graphene, 0.1-1 wt% of functionalized graphene, 15-30 wt% of epoxy resin and curing agent, 0.2-1.5 wt% of wetting dispersant, 0.1-0.5 wt% of defoaming agent, 0-30 wt% of conducting filler and the balance of solvent. The functionalized graphene is amino-containing functionalized graphene or sulfhydryl-containing functionalized graphene. The functionalized graphene contains amino or sulfhydryl group, and therefore, can be better dispersed in the system, and the amino or sulfhydryl group can react with epoxy group in the epoxy resin, thereby enhancing the binding force of the coating; and besides, the graphene has a flake structure and a large radius-thickness ratio and is arranged as a plurality of layers in the coated film in parallel, and therefore, the conducting paint has favorable conductivity and adhesiveness.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a conductive paint. Background technique [0002] Conductive coatings refer to a class of functional coatings that are coated on non-conductive substrates to enable them to conduct current and eliminate accumulated static charges. Conductive coating is a special coating. With the development of industrial technology and the improvement of various electrical performance requirements, the application range of conductive coating is becoming wider and wider. Conductive coatings are mainly composed of conductive fillers, resins, diluents and additives. Among them, the conductive fillers are generally metal powders such as silver, copper, and nickel, and non-metallic powders such as conductive carbon black, graphite, and oxides. There are mainly two deficiencies in the preparation technology of existing conductive coatings: the one is that the conductive filler is not ideal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D163/00C09D7/12C09D5/24
Inventor 周旭峰刘兆平王玉琼冯冬梅
Owner NINGBO GRAPHENE INNOVATION CENT CO LTD
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