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Method for producing back silver paste

A technology for backing silver paste and production methods, which is applied to conductive materials, electrical components, circuits, etc. dispersed in non-conductive inorganic materials, and can solve the imbalance of paste formula, affect the quality of silver paste, and affect paste coating Performance and other issues to achieve the effect of avoiding proportional imbalance

Inactive Publication Date: 2014-03-05
JIANGSU RUIDE NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation process of the existing back silver paste either does not have a vacuuming step, resulting in a large number of air bubbles in the paste, which affects the quality of the silver paste after coating, or has a vacuuming step, but long-term vacuuming can easily lead to The liquid component is excessively extracted, resulting in an imbalance in the proportion of the slurry formula, increasing the viscosity, and affecting the coating performance of the slurry

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The production preparation method of back silver paste of the present invention comprises the following basic steps:

[0019] S1. Prepare organic vehicle, glass powder and silver powder respectively; wherein the specific preparation method of organic vehicle is: by adding thickener ethyl cellulose to organic solvent terpineol, terpineol is heated to 60 by water bath or oil bath °C, stir until the ethyl cellulose is completely dissolved to obtain an organic vehicle, and keep the organic vehicle at 30 °C for use, the weight ratio of thickener and organic solvent is 5%:95%; the glass powder is lead-free bismuth borosilicate system;

[0020] S2. Weigh the silver powder and glass powder and pour them into a mechanical mixer for mixing. The weight ratio of silver powder and glass powder is 85%: 15%. After mixing evenly, discharge to obtain a mixture of silver powder and glass powder. Keep at 30°C;

[0021] S3. Add organic carrier to the mixture of silver powder and glass po...

Embodiment ２

[0024] The production preparation method of back silver paste of the present invention comprises the following basic steps:

[0025] S1. Prepare organic vehicle, glass powder and silver powder respectively; wherein the specific preparation method of organic vehicle is: by adding thickener ethyl cellulose to organic solvent terpineol, terpineol is heated to 90°C by water bath or oil bath °C, stir until the ethyl cellulose is completely dissolved to obtain an organic vehicle, and keep the organic vehicle at 40 °C for use, the weight ratio of thickener and organic solvent is 10%:90%; the glass powder is lead-free bismuth borosilicate system;

[0026] S2. Weigh the silver powder and glass powder and pour them into a mechanical mixer for mixing. The weight ratio of silver powder and glass powder is 90%:10%. After mixing evenly, discharge to obtain a mixture of silver powder and glass powder. Keep at 40°C;

[0027] S3. Add organic carrier to the mixture of silver powder and glass ...

Embodiment 3

[0030] The production preparation method of back silver paste of the present invention comprises the following basic steps:

[0031] S1. Prepare organic vehicle, glass powder and silver powder respectively; wherein the specific preparation method of organic vehicle is: by adding thickener ethyl cellulose to organic solvent terpineol, terpineol is heated to 75 by water bath or oil bath °C, stir until the ethyl cellulose is completely dissolved to obtain an organic vehicle, and keep the organic vehicle at 35 °C for use, the weight ratio of thickener and organic solvent is 8%:92%; the glass powder is lead-free bismuth borosilicate system;

[0032] S2. Weigh the silver powder and glass powder and pour them into a mechanical mixer for mixing. The weight ratio of silver powder and glass powder is 88%: 12%. After mixing evenly, discharge to obtain a mixture of silver powder and glass powder. Keep at 35°C;

[0033] S3. Add organic carrier to the mixture of silver powder and glass po...

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Abstract

The invention relates to a method for producing back silver paste. The method includes the following steps that S1, organic carriers, glass powder and silver powder are prepared; S2, the silver powder and the glass powder are weighed and poured into a mechanical blender mixer to be mixed, discharging is carried out after even mixing, and thus a mixture of the silver powder and the glass powder is obtained; S3, the organic carriers are added into the mixture of the silver powder and the glass powder, afterwards, the mixture together with the organic carriers is poured into a rotation type blender to be evenly stirred in a rotating mode, in the rotation stirring process, low-speed mixing is conducted first at the rotating speed of 30-100 turns / min until a pasty material with dry powder is achieved, then, the rotating speed is accelerated to 120-280 turns / min, and fast rotating mixing and vacuum pumping are carried out; S4, the mixture after being stirred in the rotating mode is ground for 5-10 times through a three-high mill, so that the back silver paste is obtained. According to the preparation method, the paste is rotated at a low speed to obtain the pastry material without the dry powder, then the paste is rotated and stirred at a high speed, vacuum pumping is further conducted, it is guaranteed that bubbles can be effectively removed, meanwhile, liquid components in the paste can be prevented from being extracted, paste formula proportion unbalance is avoided, and the viscosity is increased.

Description

technical field [0001] The invention relates to back silver paste, in particular to a production method of back silver paste. Background technique [0002] Solar cell back silver paste, as the back silver paste of solar cell paste, is an important raw material for solar cells and an important factor affecting the energy conversion of solar cells. The existing back silver paste preparation process either does not have a vacuum step, resulting in a large number of air bubbles in the paste, which affects the quality of the silver paste after coating, or has a vacuum step, but long-term vacuuming can easily lead to The liquid component is excessively extracted, resulting in an imbalance in the proportion of the slurry formula, increasing the viscosity, and affecting the coating performance of the slurry. Contents of the invention [0003] The technical problem to be solved by the present invention is to provide a method for producing back-silver paste. The ratio of the paste ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B13/00H01B1/22
Inventor 戈士勇
Owner JIANGSU RUIDE NEW ENERGY TECH
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