56 results about "Propyl vinyl ether" patented technology

The combination of a hinge and an insulated wire is provided, wherein the hinge is capable of closing and opening to an angle of at least 90°, the insulated wire being secured by the hinge so as to fold when said hinge is closed and to unfold when said hinge is opened, the insulation on the wire comprising fluoropolymer, such as tetrafluoroethylene / -hexafluoropropylene copolymer or tetrafluoroethylene / perfluoro(methyl vinyl ether) / perfluoro(propyl vinyl ether) copolymer, each polymer having a melting point of 260 to 290° C. and MIT Flex Life of at least about 15,000 cycles, the hinge being useful in such electronic devices as a laptop computer or a clamshell cell phone, attaching the keyboard and screen portion to one another, the insulation being capable of repeated opening and closing of the hinge without cracking of the insulation.

The invention relates to a process for preparing a fluorine-containing high polymer high frequency circuit board material by a hydrothermal method, which belongs to the high frequency circuit substrate material field. The method comprises the following steps: uniformly mixing a polytetrafluoroethylene emulsion (PTFE), a fluoroethylenepropylene emulsion (FEP) and a polyfluoroalkoxy emulsion (PFA), adding salts, then adding a molecule guiding agent and a molecular weight regulator, uniformly mixing, adding in a reaction vessel for performing hydrothermal reaction to complete high-molecular secondary polymerization, acquiring a substance of dielectric inorganic compound nanoparticles coated with high-molecular, filtering, washing, drying, removing end group, sintering, rolling, cladding copper to obtain the high frequency circuit board material with different dielectric constants finally. The prepared high frequency circuit board is capable of satisfying each basic index of the high frequency circuit board, and has the advantages of adjustable dielectric constant, low loss, good mechanical property and the like; the dielectric constant can be adjusted by the circuit board according to the generated dielectric inorganic compound content, the range of the dielectric constant is 2-35 which can satisfy the different requirements.

The invention belongs to the field of fluorine-containing polymer materials, and particularly relates to a tetrafluoroethylene copolymer and a preparation method thereof. The tetrafluoroethylene copolymer is a terpolymer comprising 90-98 wt% of tetrafluoroethylene, 1-7 wt% of perfluoro-n-propyl vinyl ether and 1-3 wt% of perfluoro-propenyl alkoxy ether with a CF<2>=CFCF<2>[OCF<2>CF(CF<3>)]<n>OR<f>structure or a hydrogen-containing derivative thereof, wherein n is an integer of 0-5, and R<f> is a perfluoroalkyl group provided with 1-5 carbon atoms or the derivative containing hydrogen atoms. The tetrafluoroethylene copolymer has good melting fluidity and thermal stability, high flexibility, high transparency and high surface finish. A green environment-friendly solvent is adopted in the preparation method, and damage to the atmospheric ozone layer is avoided, energy is saved, and the environment is protected.