Low-cost environmental-protecting halogen-free conductive slurry

A conductive paste, low-cost technology, applied in the direction of conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, can solve the problems of poor conductive effect, large pollution, high cost of conductive paste, and reduce research and development Low cost and good electrical conductivity

Inactive Publication Date: 2010-10-20
IRICO
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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 disadvantages of high cost, high pollution and poor conductive effect of the existing conductive paste, and provide a low-cost, environmentally friendly, halogen-free conductive paste

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Use flake silver powder with a particle diameter of 1-10 μm and carbon powder with a diameter of 1-5 μm to mix, and the mixing ratio is 9:1.

[0028] The solvent is a mixture of propylene glycol methyl ether acetate and ethyl cellosolve acetate, and the mixing ratio is 1:4.

[0029] The polymer resin selected is Dynapol L205.

[0030] The content of each component is:

[0031] Conductive powder: 40%,

[0032] Solvent: 45%,

[0033] Polymer resin: 13%,

[0034] 1% coupling agent,

[0035] Thickener 1%,

[0036] First, under the condition of 70°C, the solvent and the resin are mixed at a high speed to a uniform state to form an organic vehicle. The conductive powder is pre-mixed, and then the mixed powder is added to an organic carrier, a silane coupling agent and a thickener are added, and the final conductive paste is obtained after being stirred by a mixer and ground by a three-roll machine. The paste can be printed on flexible substrates with a drying temperatu...

Embodiment 2

[0038] Use flake silver powder with a particle diameter of 1-10 μm and nickel powder with a diameter of 0.5-4.0 μm to mix, and the mixing ratio is 4:1.

[0039] The solvents were DBE, ethyl carbitol acetate and propylene glycol methyl ether acetate.

[0040] The polymer resins used are SKES-300 polyester resin and Toyobo 500 polyester resin.

[0041] The content of each component is:

[0042] Conductive powder: 45%,

[0043] DBE: 21%,

[0044] Ethyl Carbitol Acetate: 17%,

[0045] Propylene glycol methyl ether acetate: 4%,

[0046] ES-300: 6%,

[0047] 500: 6%,

[0048] Leveling agent 0.5%,

[0049] Thickener 0.5%,

[0050] First, under the condition of 60°C, SKES-300 polyester resin and DBE were mixed at high speed to a uniform state to form the first organic vehicle; under the condition of 70°C, Toyobo 500 type polyester resin and ethyl carbitol Acetate and propylene glycol methyl ether acetate are mixed at high speed to a uniform state to form the second organic ca...

Embodiment 3

[0052] Use flake silver powder with a particle diameter of 1-10 μm and nickel powder with a diameter of 0.5-4.0 μm to mix, and the mixing ratio is 19:1.

[0053] The solvents were ethyl cellosolve acetate and propylene glycol methyl ether acetate.

[0054] The polymer resins selected are Toyobo 103 type polyester resin and Toyobo 500 type polyester resin.

[0055] The content of each component is:

[0056] Conductive powder: 42.5%,

[0057] Ethyl cellosolve acetate: 35%,

[0058] Propylene glycol methyl ether acetate: 5%

[0059] 103: 9%,

[0060] 500: 6%,

[0061] Coupling agent 1.5%,

[0062] Thickener 1%,

[0063] First, under the condition of 65°C, Toyobo 103 and 500 polyester resins, ethyl cellosolve acetate, and propylene glycol methyl ether acetate were mixed at high speed to a uniform state to form an organic vehicle, and then the mixed conductive powder was added Add a coupling agent and a thickener to the organic carrier, mix and grind evenly with a mixer and...

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Abstract

The invention discloses low-cost environmental-protecting halogen-free conductive slurry, which comprises conductive powder, organic carriers and additives. The conductive powder comprises 80-95 percent by mass of silver powder and 5-20 percent by mass of non-silver conductive powder; the main components of the organic carriers are polymer resin and solvent; and the additives mainly comprise thickeners, coupling agents, leveling agents and the like. The low-cost environmental-protecting halogen-free conductive slurry provided by the invention not only reduces the research and development cost and has good electrical conductivity, but also complies with EU safety standards for electronic products.

Description

technical field [0001] The invention relates to a low-cost, environment-friendly, halogen-free conductive paste, in particular to a low-cost, environment-friendly, halogen-free conductive paste used in the fields of keyboard circuit printing, membrane switches and the like. Background technique [0002] Since 2009, EU countries have implemented halogen restriction laws to limit the content of halogens in electronic products entering EU countries. The electronic paste is mainly used in electronic components such as keyboard circuits and membrane switches of electronic products, so the halogen-free organic part of the conductive paste is also imperative. [0003] Generally, the organic carrier part of conductive silver paste used in membrane switches and keyboard circuits is mainly halogen. This organic system has short drying times, strong adhesion, low dry film resistance and good flex resistance. However, the drying time of general halogen-free conductive silver paste is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/20H01B13/00
Inventor 朱万超
Owner IRICO
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