Organic adhesive for aluminum paste of silicon solar cells and preparation method thereof
A technology of silicon solar cells and organic adhesives, applied in the direction of adhesive types, cellulose adhesives, adhesives, etc., can solve the problem of poor uniformity and continuity of back field electrodes, poor film density, and reduced yield, etc. problem, to achieve good wetting and dispersing performance, simple process method, and reduce the tendency of agglomeration
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[0029] Example 1
[0030] The components of the organic binder are: 2.8% by mass of ethyl cellulose, 1.2% of butyl cellulose, 24% of diethylene glycol-diethyl ether, 32% of dipropylene glycol-methyl ether, and diethyl phthalate 8.0%, Propylene Glycol Butyl Ether 30%, Deco Dispers655 0.8%, Airex 900 1.2%. The above composition is shown in Example 1 in Table 1, and the components in Table 1 are mass percentages.
[0031] The organic binder preparation steps: put the above components into the stainless steel reaction kettle, heat up the temperature by electric heating, start the stirrer, the stirring speed is 80 r / min, and the solution in the reaction kettle is heated to 140 ° C for 2.5 hours at a constant temperature. The reaction kettle was uniformly mixed and fully reacted. After cooling, the obtained reactant was filtered with a 200-mesh wire mesh to obtain a finished organic binder for silicon solar cell aluminum paste. The above-mentioned preparation process conditions are...
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[0043] Example 2 - Example 6
[0044] The components of the organic binder, the preparation steps and the test results of the performance indexes related to the organic binder of the present invention are shown in Table 1, Table 2 and Table 3, respectively.
[0045] Table 2
[0046]
[0047] table 3
[0048]
[0049] Note: The adhesive strength is grade 1, the adhesive strength is good, and the adhesive strength decreases with the increase of the grade.
[0050] It can be seen from the test data of table 3 embodiment 1-6 and comparative example 7-8:
[0051] The aluminum paste for silicon solar cells prepared with the organic binder of the present invention comprising the combination of butyl cellulose acetate and ethyl cellulose has a significantly reduced rate of silicon wafer fragments after drying (before sintering), that is, effectively reduced The stress on the silicon wafer; and the adhesive strength of the aluminum paste film layer after drying and the silicon...
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