Preparation method of fluororesin-containing modified polyimide film
A polyimide film and polyimide technology are applied in the field of preparation of polymer films for the electronics and motor industries, and can solve the problems of high viscosity of polyamic acid, decreased mechanical properties of the film, foaming and the like, and achieve high resistance to Corona performance, not easy to bond and delaminate, good comprehensive performance
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Embodiment 1
[0020] In the first step, 1.0 mol of diaminodiphenyl ether was dissolved in N-methylpyrrolidone in a four-neck flask filled with nitrogen, equipped with a thermometer and a stirrer. After it was completely dissolved, the reaction temperature was lowered to 10° C., and then 1.0 mol of pyromellitic dianhydride was added in 6 times within 1 hour to control the solid content of the reaction system to 15%. The polyamic acid solution (I) can be obtained by constant temperature reaction for 3 hours after the addition of the dianhydride monomer. Add polytetrafluoroethylene (PTFE) powder with a particle diameter of 500nm into the polyamic acid solution (I), and the addition amount is 62% of the mass of the polyamic acid solution (I). Subsequently, a mixed solvent of N-methylpyrrolidone and 3,5,5-trimethyl-2-cyclohexenone with a volume ratio of 1:1 was added, and the amount of the mixed solvent was polyimide solution (I) 20% of the mass. The mixed system was ground in a ball mill for ...
Embodiment 2
[0023] In the first step, in a four-necked flask with nitrogen, a thermometer and a stirrer, 0.40mol of diaminodiphenyl ether and 0.60mol of 2,2-bis[4-(4-aminophenoxy) Phenyl]butane was dissolved in N,N-dimethylacetamide. After it was completely dissolved, the reaction temperature was lowered to 10°C, and then 0.7mol of pyromellitic dianhydride and 0.34mol of 3,3',4,4'-biphenyltetracarboxylic dianhydride, and control the solid content of the reaction system to 17%. After adding the dianhydride monomer, react at constant temperature for 5 hours to obtain the polyamic acid solution (I). The mixed powder of polytetrafluoroethylene (PTFE) and ethylene-chlorotrifluoroethylene copolymer (ECTFE) with a particle size of 5 μm and a mass ratio of 1:1 is added to the polyamic acid solution (I), in an amount of 80% of polyamic acid solution (I) quality. Subsequently, a mixed solvent of N-methylpyrrolidone and 3,5,5-trimethyl-2-cyclohexenone with a volume ratio of 1:1 was added, and the ...
Embodiment 3
[0026] In the first step, in a four-necked flask with nitrogen, a thermometer and a stirrer, 0.70 mol of diaminodiphenyl ether, 0.15 mol of 1,3-bis(4-aminophenoxy)benzene and 0.15 mol of p-phenylenediamine was dissolved in N,N-dimethylformamide, after it was completely dissolved, the reaction temperature was lowered to 10°C, and then 0.50 mol of pyromellitic dianhydride was added in 6 times within 1 hour , 0.30 mol of 3,3',4,4'-biphenyltetracarboxylic dianhydride and 0.22 mol of tribenzoic acid triphenylene ether tetracarboxylic dianhydride, and the solid content of the reaction system was controlled to be 16%. After the addition of the dianhydride monomer, react at a constant temperature for 4 hours to obtain a polyamic acid solution (I). Particle diameter is that 400nm, mass ratio is the polytetrafluoroethylene (PTFE) of 1:1 and the mixed powder of polyvinyl fluoride (PVF) joins in this polyamic acid solution (I), and addition is polyamic acid solution ( 1) 55% of mass. Su...
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