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A kind of preparation method of graphene heat dissipation film for floor
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A graphene and heat-dissipating film technology is applied in the field of preparation of graphene heat-conducting heat-dissipating films for floors, and can solve the problems of easily damaged edges and corners, difficult and uniform dispersion of graphene layers, complicated preparation process of heat-conducting films, etc.
Active Publication Date: 2022-05-17
ANHUI YANGZI FLOORING
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[0004] Most of the existing heat conduction films are graphite and polyimide, or graphene-graphite composite heat dissipation films, and most of them are used in electronic products. Compared with floor heating floors, the preparation process of these heat conduction films is complicated, and graphene It is not easy to disperse evenly during layer preparation, and the corners are easily damaged
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Embodiment 1
[0042] Preparation of polyurethane emulsion:
[0043] A1. Under the protection of nitrogen, add 100g of isophorone diisocyanate, 70g of polycarbonate diol, 25g of 1,4-butanediol and 1g of dibutyltin dilaurate into the reaction flask, raise the temperature to 85°C, and react 3- 5h, then add 5g of 2,2-dimethylolpropionic acid, and continue to react at 85°C for 3h to obtain prepolymer 1;
[0044] A2. Add 15g of methyl methacrylate, 7g of triethylamine and 400g of deionized water to 100g of prepolymer 1, stir and mix for 30min to obtain a polyurethane dispersion;
[0045] A3. Heat 100g of polyurethane dispersion to 80°C, add 0.5g of azobisisobutyronitrile, react for 3h, and distill off the solvent under reduced pressure to obtain polyurethane emulsion A.
Embodiment 2
[0047] Preparation of polyurethane emulsion:
[0048] A1. Under the protection of nitrogen, add 100g of isophorone diisocyanate, 80g of polycarbonate diol, 20g of 1,4-butanediol and 1g of dibutyltin dilaurate into the reaction flask, raise the temperature to 85°C, and react 3- 5h, then add 8g of 2,2-dimethylolpropionic acid, and continue to react at 85°C for 3h to obtain prepolymer 1;
[0049] A2. Add 15g of methyl methacrylate, 7g of triethylamine and 400g of deionized water to 100g of prepolymer 1, stir and mix for 30min to obtain a polyurethane dispersion;
[0050] A3. Heat 100g of polyurethane dispersion to 80°C, add 1g of azobisisobutyronitrile, react for 3h, and distill off the solvent under reduced pressure to obtain polyurethane emulsion B.
Embodiment 3
[0052] Preparation of PET film:
[0053] B1. Add 5g of dried graphene oxide into 200g of ethylene glycol, ultrasonically disperse for 2h, then add 100g of terephthalic acid, 0.5g of antimony trioxide and 2g of triphenyl phosphite, mix well, and put into the polymerization kettle In 220 ° C, 0.3MPa under the conditions of 8 hours to obtain PET prepolymer;
[0054] B2. Add 10 g of 9,10-dihydro-9-oxa-10-phosphophenanthrene-succinic acid to the PET prepolymer, heat to 260°C and continue the reaction for 8 hours, then stop the reaction, discharge and pelletize After drying, modified PET is obtained;
[0055] B3. The modified PET film is melt-extruded, and the modified PET film A is obtained after casting cooling, corona treatment, trimming and winding treatment.
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Abstract
The invention discloses a method for preparing a graphene heat-conducting and heat-dissipating film for floors. The specific preparation steps are as follows: S1, adding graphene powder into a polyurethane emulsion, adding a surfactant, and stirring evenly to obtain a graphene mixed emulsion; S2, Evenly coat the graphene mixed emulsion on the modified PET film, and use a desktop coater to coat the graphene mixed emulsion on the PET film. The thickness of the graphene mixed emulsion is 10-20 μm; S3. Dry the PET film at 70-90°C for 8-16 hours to obtain a semi-finished graphene heat-conducting and heat-dissipating film; S4, use a double-roller rolling machine to perform thermal rolling treatment on the semi-finished graphene heat-conducting and heat-dissipating film to obtain a graphene heat-conducting and heat-dissipating film The present invention disperses graphene powder by using polyurethane emulsion as a solvent, so that graphene is evenly coated on the surface of the modified PET film, and at the same time, the polyurethane emulsion forms a cross-linked solidified layer after drying, which is convenient for the modified PET film Combined with the floor substrate, it also protects the graphene sheet.
Description
technical field [0001] The invention relates to the technical field of graphite materials, in particular to a method for preparing a graphene heat-conducting and heat-dissipating film for floors. Background technique [0002] Floor heating refers to the floor suitable for low-temperature hot water floor heating. To measure the real floor heating needs many specific technical parameters. First of all, it must have good heat conduction and heat dissipation. Therefore, many existing floor heating floors are developing more Environmentally friendly flooring materials with better heat conduction and heat dissipation performance. [0003] Graphite is a material with excellent thermal conductivity. In recent years, thermally conductive graphite film has developed rapidly. Thermally conductive graphite film is also known as thermally conductive graphite sheet, heat-dissipating graphite film, graphite heat-dissipating film and so on. Thermally conductive graphite film is a new type ...
Claims
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