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Conductive paste, preparation method and application thereof

A technology of conductive paste and raw materials, applied in conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc., can solve the problem of uneven line width, low material utilization, complex process, etc. problems, to achieve the effect of improving photoelectric conversion efficiency, improving screen printing quality, and narrowing the line width

Pending Publication Date: 2022-06-03
南通俊丰新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The photosensitive etching method can be finely processed to obtain high-quality electrode images, but this method has the disadvantages of low material utilization, complicated process, and large usage.
The screen printing process is simple, the material utilization rate is high, and the cost is low, which is very suitable for mass production. However, when facing fine processing (such as line width less than 20 μm), it is prone to sawtooth, broken line, uneven line width, etc. phenomenon, and the stretching of the screen mask during printing in the process of large-scale production may cause graphic deformation and poor printing shape. In order to break through the limitations of fine processing of screen printing, it is urgent to develop a printing plastic shaped conductive paste

Method used

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  • Conductive paste, preparation method and application thereof
  • Conductive paste, preparation method and application thereof
  • Conductive paste, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] According to the parts by mass, fully mix 0.1 part of polyurethane resin, 0.3 part of modified hydrogenated castor oil, 0.3 part of alkylammonium salt type cationic surfactant and 7.3 parts of butyl carbitol to obtain an organic carrier; 90 parts of silver powder Pre-mix with 2 parts of glass powder evenly, and then add the organic carrier to the mixture of silver powder and glass powder according to the principle of equal increment. After each addition, stir evenly, and add the next time. After all additions are completed, stir at high speed. Finally, the mixture is ground by a three-roller machine with a particle size of less than 6 μm, and filtered to obtain conductive silver paste.

Embodiment 2

[0043] According to the parts by mass, 1.0 parts of polyurethane resin, 0.3 parts of polyamide wax, 0.3 parts of BYK180 and 6.4 parts of alcohol ester-12 are fully mixed to obtain an organic carrier; 90 parts of silver powder and 2 parts of glass powder are pre-mixed uniformly, and then the organic The carrier is added to the mixture of silver powder and glass powder according to the principle of equal increment. After each addition, stir evenly, and add the next time. After all additions, stir at high speed. Finally, the mixture is ground by a three-roller machine with a particle size of less than 6 μm, and filtered to obtain conductive silver paste.

Embodiment 3

[0045] According to the mass parts, fully mix 0.4 parts of polyurethane resin, 0.3 parts of polyamide wax, 0.3 parts of Digao 655 and 7.0 parts of diethyl phthalate to obtain an organic carrier; 92 parts of silver powder and 2 parts of glass powder are pre-mixed Mix well, and then add the organic vehicle to the mixture of silver powder and glass powder according to the principle of equal increment. After each addition, stir evenly, and add the next time. After all additions, stir at high speed. Finally, the mixture is ground by a three-roller machine with a particle size of less than 6 μm, and filtered to obtain conductive silver paste.

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Abstract

The invention discloses conductive paste which comprises silver powder, glass powder and an organic carrier, the organic carrier comprises polyurethane resin, a thixotropic agent, a dispersing agent and a solvent, and the mass percent of each raw material is as follows: 88-92% of the silver powder, 2-5% of the glass powder, 0.1-1% of the polyurethane resin, 0.8-9.7% of the solvent, 0.1-0.6% of the thixotropic agent and 0.1-0.6% of the dispersing agent. The organic carrier provided by the invention is reasonable in component formula, contributes to improving the rheological property of a slurry system, can remarkably improve the linear shaping capability of a grid line after being mixed and dispersed into silver slurry according to a certain proportion, and is narrow in line width after printing, low in broken grid proportion and high in stability. Therefore, the silk-screen quality of the silver paste on the silicon wafer and the height-width ratio of the sintered electrode to the grid line are improved, and the photoelectric conversion efficiency can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of solar cell paste, and in particular relates to a conductive paste with excellent printing performance, a preparation method and an application thereof. Background technique [0002] With the depletion of fossil energy, the energy problem has become a restrictive factor affecting the survival and development of human beings. As one of the ways to use solar energy, solar cells are expected to become an important way for human beings to obtain energy demand for long-term development. The conductive paste is used as the material for the front metallization of the silicon solar cell, which is mainly composed of the conductive functional phase silver powder, the binding phase glass powder and the organic carrier. The organic carrier is generally composed of solvent, thixotropic agent, dispersant and other functional additives. Its main function is to disperse and wet the powder particles in the conductive past...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00
CPCH01B1/22H01B13/00Y02E10/50
Inventor 张彦陶俊
Owner 南通俊丰新材料科技有限公司
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