34 results about "1,1-Difluoroethylene" patented technology

The vinylidene fluoride copolymer of the present invention is a polymer obtained by copolymerizing at least one type of fluorine-based monomer selected from hexafluoropropylene and chlorotrifluoroethylene, vinylidene fluoride, and a compound represented by formula (1) (wherein X is an atomic group having a hydroxyl group or a carboxyl group and having a molecular weight of not greater than 517 with a main chain having from 1 to 19 atoms) and is obtained by adding the compound represented by formula (1) to the fluorine-based monomer and vinylidene fluoride in divided portions or continuously during copolymerization. The gel electrolyte of the present invention contains the vinylidene fluoride copolymer and a non-aqueous electrolyte solution, and the gel electrolyte has an excellent balance of ionic conductivity and gel strength.

The invention discloses a preparation method of 1,1-difluoroethylene. The preparation method comprises following steps: a composite catalyst is introduced into a tubular reactor, 1, 1-difluoro-1-chloroethane or 1, 1-difluoro-2-chloroethane is taken as a raw material and is introduced into the tubular reactor for gas phase catalytic cracking so as to obtain 1,1-difluoroethylene. The composite catalyst is a metal composite fluoride. The method is low in reaction temperature, high in product selectivity, high in yield, mild in operation technical conditions, and simple in operation, and the reproducibility of the adopted catalyst is high.

To provide an economically advantageous process for producing HFO-1234yf useful as a new refrigerant in sufficiently high yield by one reaction involving thermal decomposition. A process for producing HFO-1234yf and VdF from raw material containing R22, R40 and TFE, by a synthetic reaction involving thermal decomposition, which comprises (a) a step of supplying the R22, the R40 and the TFE to a reactor, as preliminarily mixed or separately, (b) a step of supplying a heat medium to the reactor, and (c) a step of bringing the heat medium in contact with the R22, the R40 and the TFE in the reactor to form the HFO-1234yf and the VdF.

The invention discloses a solar photovoltaic panel protective film. The solar photovoltaic panel protective film comprises an optical PET layer and a protective coating which is arranged on the surface of the optical PET layer, wherein the protective coating consists of following materials in parts by weight: polyacrylate, polyethylene oxide, 1,1,2,3,3,3-hexafluo-1-propylene, poly(1,1-vinyl-difluoride), cerium oxide and lithium fluoride. The polyacrylate is used as a main material, so that the high transmittance of the protective film can be guaranteed; by adding little fluorine-containing polymer, not only is the transmittance of the protective film under the sun exposure and non-sun exposure not affected, but also the corrosion resistance and abrasion resistance of the protective film can be improved; by adding the trace metal compound, the chemical and physical performance of the protective film can be obviously improved, on the basis of not affecting the high transmittance of the film, the low reflectance and low radiation absorption rate can be guaranteed, and the weather resistance, aging resistance and low temperature and high temperature resistance of the film also can be improved.

The invention provides a method for making a 1,1-difluoroethylene polymer to obtain the 1,1-difluoroethylene polymer being high in bulk density without increasing auxiliary devices and the scale covering in a polymerization system. The method for making the 1,1-difluoroethylene polymer comprises that a monomer taking the 1,1-difluoroethylene polymer as the main content is dispersed in an aqueous medium containing suspension to be subjected to suspension polymerization. Therefore, the method is characterized in that the suspension polymerization is carried out under the existing of polyoxyethylene sorbitan fatty acid ester having a hydrophilic-lipophilic balance value (HLB) in the range of 1-8.

Provided in the present invention is a vinylidene fluoride copolymer. Same is acquired via a polymerization reaction taking place at conditions of 30-100° C. and 2-7 MPa with vinylidene fluoride, tetrafluoroethylene, and perfluorinated dioxole or C1-4 alkoxy-substituted perfluorinated dioxole as raw materials, with an initiator added into an emulsion consisting of water, fluorinated emulsifier, a chain transfer agent, a pH regulator, and an antifouling agent, and then via steps of separation, purification, refinement, condensation, washing, drying, and granulation, where the molar ratio of vinylidene fluoride, tetrafluoroethylene, and perfluorinated dioxole or C1-4 alkoxy-substituted perfluorinated dioxole is 13-17:2-4:1-3. The vinylidene fluoride copolymer of the present invention provides excellent transparency, flexibility, and solubility, is widely applicable in optical apparatus such as lenses, and is for use in specialty films in the fields of solar panels and of capacitors as a fuel cell membrane, a transparent and tough coating, and a large-sized blown object.

The invention relates to a low-temperature resistant fluorubber, and a preparation method thereof, and belongs to the field of fluorine chemical industry and high molecular material technology. The preparation method comprise following steps: 1) alcohols containing fluorine, such as tetrafluoro-1-Propanol, octafluoropentyl alcohol, and H,1H,7H-dodecafluoro-1-heptanol are taken as initial fluorine-containing materials, and are subjected to condensation with pentafluoro bromopropylene in the presence of a phase transfer catalyst so as to obtain a fluorine-containing ether containing carbon-carbon double bonds; 2) a monomer mixture is prepared from 1,1-difluoroethylene, hexafluoropropylene, and fluorine-containing alkyl pentafluoropropene ether according to a certain molar ratio, and is stored for further treatment; and 3) the monomer mixture is delivered into a polymerization vessel, and is subjected to emulsion polymerization in the presence of an emulsifier, an initiator, and a chain transferring agent, and latex obtained via polymerization is subjected to coacervation, washing, and drying, and is made into low-temperature resistant fluorubber sheets using a open mill. The preparation method is capable of improving low-temperature resistance of fluorubber effectively, so as to satisfy requirements on low-temperature sealing; the raw materials are easily available; preparation processes are easy to realize; and the preparation method is beneficial for popularization and application.

A vinylidene fluoride copolymer which comprises 99.9 to 90mol% of vinylidene fluoride monomer units, 0.1 to 10mol% of methylidenemalonic ester monomer units, and 0 to 10mol% of other monomer units and which has a weight-average molecular weight of 200,000 or more; a vinylidene fluoride copolymer as described above, which is modified by hydrolyzing 10 to 90% of the total number of the ester groups of the methylidenemalonic ester monomer units; and processes for the production of the copolymers.

The invention relates to a 1,1-difluoroethylene copolymer and a preparation method thereof, and belongs to the technical field of fluorine chemicals. The 1,1-difluoroethylene copolymer is a heterogeneous polymer containing a plurality of continuous phases and is prepared from (a) 60 to 80 percent of first continuous polymer phase which contains 95 to 100 percent of vinylidene fluoride monomeric unit and 0 to 5 percent of other fluorine-containing monomeric units and (b) 20 to 40 percent of second continuous polymer phase which contains 65 to 85 percent of the vinylidene fluoride monomeric unitand 15 to 35 percent of comonomer unit, wherein a comonomer is one or two of hexafluoropropylene and perfluoropropyethyl ether. The 1,1-difluoroethylene copolymer disclosed by the invention has excellent low-temperature flexibility and high melting temperature. The invention also provides a simple and feasible preparation method, which improves the crystallinity of polyvinylidene fluoride and improves flexibility; meanwhile, the copolymer has high melting temperature and good solvent resistance.

The invention discloses a special material for an ultraviolet resistant communication optical cable protective casing and a preparation method of the special material. The special material is prepared from the following raw materials in parts by weight: 56-74 parts of bisphenol A polycarbonate, 1-2 parts of 2,2',4,4'- tetrahydroxyl benzophenone, 5-8 parts of shea butter, 9-16 parts of zinc dihydrogen phosphate, 24-38 parts of acrylonitrile-butadiene-styrene terpolymer, 4-8 parts of pentachloro methyl stearate, 2-3 parts of neodymium iso-octanate, 10-15 parts of titanium dioxide, 18-26 parts of copolymer of 1,1,2,3,3,3-hexafluoro-1-propylene, 1,1-polyvinylidene floride and tetrafluoroethylene, 2-4 parts of tri(thioglycollic acid n-butyl ester) antimony, 3-6 parts of behenamide, 15-20 parts of organobentonite, 6-12 parts of dimethyl methylphosphonate, 5-10 parts of ammonium tetramolybdate, 2-3 parts of hydroquinone monomethyl ether, 1.5-2.5 parts of 2-phenyl benzimidazole-5-sulfonic acid and 3-6 parts of aids. The special material for the protective casing has excellent ultraviolet resistance, aging resistance, solar irradiation resistance, excellent mechanical property and electrical insulation property and high wear resistance, heat resistance and corrosion resistance, the optical cable protective casing can be kept from fading for a long time under sunshine and is prevented from being aged and cracked, and the service life of the protective casing is prolonged.