High heat dissipation graphene-polyimide composite film with insulating properties and preparation method thereof
A polyimide, polyimide precursor technology, applied in the field of graphene-polyimide composite film and its preparation, can solve problems such as limited heat transfer rate, and achieve improved dispersion and excellent insulation. Effect
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[0020] The invention provides a kind of preparation method of graphene-polyimide composite film, it comprises: step (1), adds imidization conversion liquid in polyimide precursor solution, prepares mixed solution; Step (2), Adding more than 2 layers of multilayer graphene particles into the solvent to prepare a graphene dispersion; step (3), mixing the mixed solution prepared in the above step (1) and the graphene dispersion prepared in the above step (2) , preparing a gel film; and step (4), heat-treating and imidizing the above-mentioned gel film,
[0021] In the above-mentioned step (3), the weight ratio of the above-mentioned graphene particles and the polyimide precursor is 3:97 to 8:92, based on the total weight of the solution, the above-mentioned graphene particles and the polyimide precursor The mixed solution prepared in the step (1) and the graphene dispersion prepared in the step (2) are mixed in such a manner that the content is 11 to 30 weight percent.
[0022] ...
Embodiment 1
[0049] Embodiment 1: the preparation of graphene-polyimide composite film
[0050] Preparation of polyamic acid
[0051] Put 320g of dimethylformamide (DMF) in a 0.5L reactor, set the temperature to 20°C, put in 27.59g of diaminophenyl ether (ODA) to dissolve, put 20.03g of benzene each time Pyremic dianhydride (PMDA) was dissolved after being injected twice in this way. After the dissolution was completed, 3.97 g of p-phenylenediamine (pPDA) was put into it, and after reacting for 30 minutes, the solution was sampled to measure the molecular weight. After that, after the reaction was completed, the temperature of the reactor was raised to 30°C, and then 1.00 g of pPDA was added to adjust the molar ratio of [diamine] / [dianhydride] to 1:1. After the input of the raw materials was completed, the reaction was sufficiently performed at 40°C for 2 hours to obtain a polyamic acid solution.
[0052] Preparation of imidization conversion solution
[0053] 2.8 g of β-picoline (...
Embodiment 2 and 3 and comparative example 1 and 2
[0058] Embodiment 2 and 3 and comparative example 1 and 2: the preparation of graphene-polyimide composite film
[0059] The weight ratio of above-mentioned polyamic acid and graphene particle is mixed as the weight ratio of 95:5, 92:8, 90:10 and 100:0 instead of 97:3, except that, by the same method as in Example 1 Method to prepare graphene-polyimide composite film.
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