Fine-line high-aspect-ratio screen-printing paste based on vinyl acetate resin organic vehicle
A kind of chloracetate resin, organic carrier technology, applied in conductive materials, semiconductor devices, electrical components and other directions dispersed in non-conductive inorganic materials, can solve the problem that viscosity, plasticity and meshing cannot be perfectly balanced, and silver paste cannot be Use and other problems, to achieve the effect of good plasticity, smooth upper surface and good netting.
Active Publication Date: 2020-11-10
SUZHOU BETELY POLYMER MATERIALS CO LTD +1
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Problems solved by technology
[0006] However, the current conductive paste cannot fully meet the above requirements. The main reason is that the organic carrier system of the paste still has certain deficiencies. A large number of pastes use different series of cellulose systems with different viscosities, resulting in the viscosity and plasticity of the paste. There is no perfect balance between formability and off-network
In addition, in the prior art, vinyl chloride resin is generally used in halogen-containing low-temperature curing silver paste. The use process of this silver paste is 150°C low temperature baking and curing, while the use process of crystalline silicon solar silver paste is 780°C high temperature Sintering, these two silver pastes are essentially different, and low-temperature curing silver pastes cannot be used in solar cell production
Method used
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Embodiment 1
[0065] The thin line high aspect ratio screen printing slurry based on vinyl acetate resin organic vehicle, its preparation method comprises the following steps:
[0066] (1) Preparation of organic vehicle
[0067] In parts by weight, 3 parts of VMA vinyl acetate resin (vinyl acetate content of vinyl acetate resin is 17, K value is 32-34, average molecular weight is 15000), 1.5 parts of SBN-70D curing agent, 20 parts of phthalic acid di Butyl ester, 5 parts of BYK-378 leveling agent, 0.5 parts of polyamide wax, 2 parts of Tween 80, 45 parts of 2,2,4-trimethyl-1,3-pentanediol monoisobutyrate, ethyl Mix 23 parts of dimethyl diacid, heat and stir at 60°C for 30 minutes to make a uniform and transparent solution, that is, to prepare an organic vehicle;
[0068] (2) Preparation of glass paste
[0069] In parts by weight, take 1 part of glass powder with a D50 of 1.0 μm and a Tg point of 300 ° C, and 4.26 parts of the organic vehicle prepared in step (1) and disperse evenly on a d...
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Abstract
The invention employs vinisol as a resin system, and provides a fine-line high-aspect-ratio silk-screen printing slurry based on a vinisol organic carrier. A preparation method of the slurry comprisesthe steps: mixing an organic carrier and glass powder to obtain glass slurry; and then adding silver powder into the glass slurry to obtain the fine-line high-aspect-ratio silk-screen printing slurrybased on the vinisol organic carrier. The conductive slurry disclosed by the invention has good screen setting property and excellent shaping property, can be suitable for a 430 / 13 screen printing plate with an opening (the minimum 28 microns), can also be suitable for a screen printing plate without a screen printing plate with an opening (the minimum 22 microns), has excellent printing property, and has a higher aspect ratio of printed lines.
Description
technical field [0001] The present invention relates to a kind of technology that can be used for silk screen printing, especially the manufacture of conductive silver paste for silicon solar cells, especially a kind of conductive paste that can be applied to thin lines and high aspect ratio, and specifically relates to a kind of based on vinyl chloride resin Fine line high aspect ratio screen printing paste for organic vehicles. [0002] technical background [0003] The screen printing process is an important process in the production process of silicon solar cells. Each electrode needs to use the screen printing process to print the conductive paste on the silicon wafer and make it through the sintering process. Since screen printing is an assembly line operation, it is required that the paste used should maintain stable viscosity, good screen release and shapeability during continuous and long-term printing. [0004] The conversion rate is the most critical indicator for...
Claims
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IPC IPC(8): H01B1/16H01B1/22H01L31/0224
CPCH01B1/16H01B1/22H01L31/022425
Inventor 张超梅乐李亮王全欧阳旭频
Owner SUZHOU BETELY POLYMER MATERIALS CO LTD