3 results about "Hexafluorobenzene" patented technology

The invention discloses a fluorine-containing diamine monomer, polyimide and a preparation method and application of the fluorine-containing diamine monomer, the fluorine-containing diamine monomer is generated by reacting phenol with amino and dialkyl with hexafluorobenzene, and the fluorine-containing diamine monomer and specific tetracarboxylic dianhydride with a non-rigid structure, including 4, 4 '-(hexafluoroisopropylidene) diphthalic anhydride, 4, 4'-oxydiphthalic anhydride, 9, 10-di-tert-butyl-4-methyl-1, 3, 4, 5-tetracarboxylic dianhydride, 9, 10-di-tert-butyl-4-methyl-1, 3, 5-tetracarboxylic dianhydride and 9, 10-di-tert-butyl-4-methyl-1, 3, 5-tetracarboxylic dianhydride. According to the present invention, the polyimide film with characteristics of good light transmission performance, good thermal performance and good mechanical strength can be prepared through the reaction of 2, 9-bis (trifluoromethyl) xanthene-2, 3, 6, 7-tetracid dianhydride and bisphenol A diether dianhydride, and has good application prospects in the fields of flexible display substrates, printed circuit boards, solar cell substrates, flexible packaging films and other optical films.

The invention relates to a lithium-ion electrochemical element comprising: a) a positive electrode comprising a lithium phosphate of at least one transition metal operating at a potential greater than or equal to 3.6 V vs. Li+ / Li; b) a negative electrode; c) an electrolyte comprising: - one or more solvents, one being methyl propionate, - one or more diluents selected from a fluorinated alkyl ether, fluorobenzene, 1,2-difluorobenzene and isomers thereof, 1,2,3-trifluorobenzene and isomers thereof, 1,2,3,4-tetrafluorobenzene and isomers thereof, pentafluorobenzene, hexafluorobenzene, 2-fluorotoluene and isomers thereof and a mixture thereof, the volume proportion of the one or more diluents representing from 50 to 80% of the total volume of the one or more solvents and the one or more diluents, - lithium bis(fluorosulfonyl)imide, - a negative-electrode passivation additive selected from ethylene monofluorocarbonate and / or vinylene carbonate.

The application discloses a synthesis method of hexafluorobenzene and belongs to the fine chemical field. The method is carried out according to the following process: 1) mixing pentafluorobenzene, a catalyst and an initiator to obtain a mixed solution; 2) heating a pretreated reaction device, and then feeding specific mixed gas into the device from bottom to top; then feeding the mixed solution obtained in the step 1) into the reaction device from top to bottom; 3) collecting all the crude products obtained in the step 2), and then performing rectification to obtain hexafluorobenzene. The method has the advantages of mild reaction condition, easy industrialization, low raw material cost, high product yield and purity, and energy saving and environmental protection compared with other methods.