Heat dissipation film, dispersion liquid for heat emission layer, method for producing heat dissipation film and solar cell
A technology of a heat radiation layer and a manufacturing method, applied in the field of solar cells, can solve the problems of inability to maintain electrical insulation, easy peeling, poor adhesion of metal films, etc.
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Embodiment 1
[0150] (Synthesis of polyamic acid varnish)
[0151] Put 140.1 g (0.70 mol) of 4,4-diaminodiphenyl ether and 1433.3 g of N-methyl-2-pyrrolidone into a 2-liter capacity reaction vessel equipped with a stirrer and a thermometer, and dissolve it at 30°C to 40°C . Next, while maintaining the temperature at 45°C to 50°C, 72.5 g (0.33 moles) of pyromellitic dianhydride and 3,3',4,4'-biphenyltetracarboxylic acid were added to the reaction vessel over 40 minutes. 97.8 g (0.33 mol) of dianhydride. After stirring at the same temperature for 60 minutes, 183.3 g (0.02 mol) of a solution of 2.4% by weight of pyromellitic dianhydride in N-methyl-2-pyrrolidone was added to adjust the viscosity, and 4.2% by weight of phthalo The reaction was stopped with 7.5 g (0.002 mol) of N-methyl-2-pyrrolidone solution of an acid anhydride to obtain 1933.9 g of a polyamic acid varnish with a concentration of 16.3% and a viscosity of 6.2 Pa·s.
[0152] (Manufacture of dispersion liquid for heat radiatio...
Embodiment 2
[0157] In "(Manufacture of Dispersion Liquid for Heat Radiation Layer)", talc was obtained in the same manner as in Example 1, except that the compounded amount of talc was 36.0 g, and 22.8 g of N-methyl-2-pyrrolidone was further added. A uniform dispersion liquid for a heat radiation layer having a ratio of 90.0% by weight relative to the entire non-volatile component and a ratio of 48.0% by weight of the non-volatile component relative to the entire dispersion liquid.
[0158] Using the dispersion liquid for the heat radiation layer obtained, the depth of the groove is used as a bar coater of 100 μm, except that, in the same manner as in Example 1, a water-insoluble inorganic compound ( Talc) is a heat dissipation film of a heat radiation layer having a content of 90.0% by weight relative to the entire heat radiation layer and a thickness of 57.6 μm.
Embodiment 3
[0160]In "(Manufacture of dispersion liquid for heat radiation layers)", except that the compounding quantity of talc was 1.7g, it obtained the ratio of talc with respect to the whole non-volatile component as 30.0 weight% and The ratio of the non-volatile component to the whole dispersion liquid was 21.8 weight% and the uniform dispersion liquid for heat radiation layers.
[0161] The obtained dispersion liquid for the heat radiation layer was dried in a forced-air oven at 90°C for 30 minutes using a bar coater with a groove depth of 200 μm to remove the dispersion medium, and then further used with a groove depth of 150 μm. except that the bar coater was used to coat the coating surface, and a water-insoluble inorganic compound (talc) composed of talc and polyimide resin was obtained in the same manner as in Example 1 for the entire heat radiation layer. A heat dissipation film of a heat radiation layer having a content of 30.0% by weight and a thickness of 43.6 μm.
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