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Water-based conductive paste and preparation method thereof

A conductive paste, water-based technology, applied to conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc., can solve problems that affect the storage and use of paste, and the conductivity of paste is not very good , to achieve the effect of preventing sedimentation, increasing conductivity and easy dispersion

Active Publication Date: 2021-08-17
哈工大机器人集团(无锡)科创基地研究院
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, most of the patented water-based conductive pastes use carbon materials as conductive fillers. Due to the high oil absorption value of carbon-based powders and the influence of the conductivity of the materials themselves, the final The conductivity of the obtained slurry is not very good
However, the metal powder in the water-based slurry filled with metal powder is very easy to settle, which affects the storage and use of the slurry.

Method used

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  • Water-based conductive paste and preparation method thereof

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preparation example Construction

[0040] A preparation method for aqueous conductive paste, comprising the following steps:

[0041] (1) Mix and grind deionized water and conductive synergist according to the ratio to obtain slurry A;

[0042] (2) Mix and grind the aqueous emulsion, defoamer, dispersant and conductive carbon powder according to the ratio to obtain slurry B;

[0043] (3) Grind the slurry A and the slurry B again, and after taking them out, vacuum defoaming to obtain an aqueous conductive slurry.

[0044] Wherein, the rotational speed of grinding described in steps (1)-(3) is 200-600 rpm, and the grinding time is 1-6 h.

[0045] Water-based conductive paste of the present invention comprises the composition of following mass parts:

[0046] Water-based emulsion: 10-35,

[0047] Deionized water: 5-25,

[0048] Dispersant: 0.05-3,

[0049] Defoamer: 0.1-2,

[0050] Conductive carbon powder: 10-50,

[0051] Conductive synergist: 0.5-10.

[0052]The water-based emulsion is an acrylic emulsio...

Embodiment 1

[0064] The formula table of water-based conductive paste is as follows:

[0065] raw material name Mass / g Mass fraction / % Conductivity synergist 0.2g 1.21% Deionized water 4g 24.39% Styrene-acrylate emulsion (50% solids) 6g 36.59% Defoamer (organosiloxane) 0.1g 0.61% Dispersant (polymer) 0.1g 0.61% Nano conductive carbon powder 6g 36.59%

[0066] The preparation method of water-based conductive paste is as follows:

[0067] 1. Weigh 0.4g conductive synergist, 8g deionized water, add to the ball mill, grind at 400rpm for 1h to get slurry A

[0068] 2. Weigh 12g of styrene-acrylate emulsion, 12g of nano-conductive carbon powder, 0.2g of defoamer, and 0.2g of dispersant, and add them into a ball mill tank at 500RPM for 1.5h to obtain slurry B.

[0069] 3. Take 12.2g of slurry B and 4.2g of slurry A obtained in step 2, add them to a ball mill, grind at a speed of 400rpm for 1 hour, take out the material and vacuum defoam...

Embodiment 2

[0072] The formula table of water-based conductive paste is as follows:

[0073] raw material name Mass / g Mass fraction / % Conductivity synergist 0.1g 0.61% Deionized water 4g 24.55% Styrene-acrylate emulsion (50% solids) 6g 36.81% Defoamer (organosiloxane) 0.1g 0.61% Dispersant (polymer) 0.1g 0.61% Nano conductive carbon powder 6g 36.81%

[0074] The preparation method of water-based conductive paste is as follows:

[0075] 1. Weigh 0.2g of conductive synergist and 8g of deionized water, add them to a ball mill, and grind for 1 hour at a speed of 400rpm to obtain slurry A.

[0076] 2. Weigh 12g of styrene-acrylate emulsion, 12g of nano-conductive carbon powder, 0.2g of defoamer, and 0.2g of dispersant, and add them into a ball mill tank at 500RPM for 2.0h to obtain slurry B.

[0077] 3. Take 12.2 g of slurry B obtained in step 2, and add 4.1 g of slurry A to a ball mill, grind at a speed of 400 rpm for 1 hour, take o...

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Abstract

The invention discloses a preparation method of a water-based conductive slurry, and the method comprises the following steps: mixing and grinding deionized water and a conductive synergist according to the proportion to obtain a slurry A; mixing and grinding a water-based emulsion, a defoaming agent, a dispersing agent and conductive carbon powder according to the proportion to obtain slurry B; grinding the slurry A and the slurry B again, taking out the ground slurry A and the ground slurry B, and performing vacuum defoamation to obtain the water-based conductive slurry. Through the mode, the graphene is grafted and modified, so the graphene is easy to disperse; conductive carbon powder and modified graphene loaded nano-silver particles are adopted as conductive filler, graphene is more easily dispersed in water through modification of a water-soluble ionomer on graphene, meanwhile, the nano-silver particles are loaded on the graphene, sedimentation of the silver particles is prevented, and meanwhile the conductivity of the system can be improved.

Description

technical field [0001] The invention relates to the field of conductive paste, in particular to a water-based environment-friendly conductive paste with conductive carbon powder and nano-silver loaded modified graphene as filler and a preparation method thereof. Background technique [0002] Conductive paste is a uniformly dispersed and conductive paste obtained by conducting fillers, adhesives, solvents and additives through certain technical means. Commonly used conductive fillers include gold powder, silver powder, silver copper powder, copper powder, Nickel powder, graphite, conductive carbon black, carbon nanotubes, graphene, carbon fiber, etc. [0003] At present, most of the patented water-based conductive pastes use carbon materials as conductive fillers. Due to the high oil absorption value of carbon-based powders and the influence of the conductivity of the materials themselves, the conductivity of the final pastes is not very good. However, the metal powder in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B1/22
CPCH01B13/00H01B1/22
Inventor 宋启超韩志东门振龙
Owner 哈工大机器人集团(无锡)科创基地研究院