78 results about "Perfluoroether" patented technology

A curable fluoropolyether composition comprises (A) a fluoropolyether compound, (B) a perfluoropolyether, (C) an organohydrogenpolysiloxane, (D) spherical silica powder, (E) a fluorinated trialkoxysilane, and (F) a platinum catalyst. The composition can be heavily loaded with the silica (D). By virtue of using components (A) and (B) both having a perfluoroether structure in the backbone as the base polymer, the curable fluoropolyether composition cures through heating at a low temperature for a short time into a product having good heat resistance, freeze resistance, oil resistance, solvent resistance, chemical resistance, moisture resistance, and electrical insulation.

The invention discloses a perfluoroether composite air condition hose, comprising an internal rubber layer, a shielding layer, a middle rubber layer, an enhancement layer and an external layer which are arranged from inside to outside, wherein the internal rubber layer is made of a perfluoroether rubber material; the perfluoroether rubber material is synthesized from tetrafluoroethylene, perfluoromethyl vinyl ether and a third monomer containing vulcanization points; the third monomer has the general formula of CF2=CF-ORfX (X is -COOR, -CN, -OC6H5), and the optimal third monomer is perfluoro(4-cyano butyl vinyl ether), perfluoro(2-fluorophenyl propyl vinyl ether) or perfluoro(styrene); and the middle rubber layer is made of one of butyl rubber, chloroprene rubber, brombutyl rubber and chlorobutyl rubber, or the middle rubber layer is prepared by blending two or more of the butyl rubber, the chloroprene rubber, the brombutyl rubber and the chlorobutyl rubber. The perfluoroether composite air condition hose provided by the invention has the characteristics of strong penetration resistance, chemical corrosion resistance, high temperature and low temperature resistance, good vibration adsorption and low vibration noise, can meet the requirement on penetration resistance of novel refrigerant and replaces metal materials truly.

A process for producing a thin film and an optical member which are free from discoloration of a lens and exhibit a good antistatic property and a good water repellency. The thin film is formed by a vacuum deposition of a water repellent solution which contains (a) a water repellent having a perfluoroalkyl group, (b) a mixture of a silane coupling agent, a modified silicone oil introduced with an organic group into its side chain and/or both terminal ends, and a perfluoroether compound, and (c) at least one conductive substance selected from the group consisting of fullerenes, carbon nanotubes and graphite compounds.

The invention discloses a preparation method of a perfluoroether elastomer. The preparation method comprises the step of carrying out emulsion polymerization on four comonomers in the presence of an initiator and a chain transfer agent, so as to prepare a fluorine-containing elastomer, wherein the four comonomers are as follows: the first monomer is tetrafluoroethylene, the second monomer is perfluoromethyl vinyl ether, the third monomer is a vulcanization point monomer, and the fourth monomer is pentafluoroethyl vinyl ether and/or pentafluoropropyl vinyl ether; and the fluorine-containing elastomer is prepared from the following steps: adding water into a reaction container, introducing a mixture of the first monomer, the second monomer and the fourth monomer, maintaining the pressure of the container at 0.5MPa-2.0MPa, adding 2g/L-10g/L of the third monomer according to the mass volume ratio, and carrying out polymerization reaction. According to the preparation method, the monomers such as PEVE/PPVE are used in the reaction, so that the rigidity of molecular chains can be reduced, the flexibility of molecular chains can be increased, and the hardness of the perfluoroether elastomer is reduced.

The invention discloses a method for making ethylene-tetrafluoroethylene copolymer. The method adopts a microemulsion system, and the microemulsion comprises deionized water, perfluoro ether oil, perfluoro dispersant and an auxiliary agent. The obtained ethylene-tetrafluoroethylene copolymer has thermal cracking resistance at high temperature, excellent chemical corrosion resistance and outstanding mechanical property.

The invention relates to a synthesis method of a low temperature-resistant perfluoroether rubber. The synthesis method comprises the following steps: 1) evenly mixing an emulsifier, fluoroether oil and water together and heating until 40 DEG C to form a microemulsion, and adding a comonomer A and a comonomer B to the microemulsion to obtain a mixed liquor; 2) adding deionized water and a pH regulator to a reaction kettle, adjusting the content of oxygen in the reaction kettle to be lower than 20ppm, increasing the temperature in the reaction kettle to the range of 70-120 DEG C, and adding the mixture of tetrafluoroethylene and perfluoromethyl vinyl ether to the reaction kettle; 3) adding the mixed liquor to the reaction kettle and adding the initiator potassium peroxodisulfate to start reacting, and adding a vulcanization point monomer and a chain transfer agent until the reaction ends, thereby obtaining a polymer; 4) performing electrolyte coagulation on the polymer and then washing, drying in vacuum and molding by plastifying to obtain the perfluoroether rubber. The synthesis method is simple to operate and mild in reaction conditions, and is capable of preparing the low-temperature-resistant perfluoroether rubber by adjusting the monomer structure.

The present invention relates to a perfluoropolyoxyalkylene group-containing polymer represented by the following formula (1),

Poly fluorine-containing siloxane coatings having improved hydrophobic and oleophobic properties and solutions for creating such coatings are provided. In some embodiments, the coating includes a polymer having a plurality of Si—O—Si linkages; and at least two fluorine-containing moieties, each attached to at least one of the Si—O—Si linkages. Each fluorine-containing moiety independently includes a linking portion attached to a silicon of one of the Si—O—Si linkages, wherein the linking portion is of a formula selected from the group consisting of: —[CH₂]_a— where a is an integer from 1 to 10 and —[CH₂]_bCONH[CH₂]_c— where b and c are independently an integer from 0 to 10. Each fluorine-containing moiety also independently includes a fluorinated portion attached to the linking portion, wherein the fluorinated portion is selected from a fluorinated-alkyl group having 1-10 carbon atoms and a perfluoro-ether containing organic group.

The invention discloses a silicone rubber tube with high-temperature resistance and high flame retardancy. The silicone rubber tube comprises raw materials as follows: methyl vinyl phenyl silicone rubber, perfluoroether rubber, zinc oxide, stearic acid, 2,5-dimethyl-2,5-di(tert-butylperoxy) hexane, DIPDIS, ceramic fiber, nano carbon fiber, triethyl aluminum, aluminum hydroxide, zirconium oxide, hollow phenolic aldehyde microspheres, iron oxide red, modified montmorillonite, aedelforsite, hexamethyl disilazane, an anti-aging agent, ethyl carbamate, phthalate acid ester, tricresyl phosphate, vinyl silicone oil and an accelerant. The silicone rubber tube with high-temperature resistance and high flame retardancy has excellent flame retardancy, good high-temperature resistance and high strength, and products of the silicone rubber tube can meet use requirements in various environments and have long service life.

The invention discloses an environment-friendly flame-retardant solvent cleaner. The solvent cleaner comprises a main cleaning agent, an azeotropic solvent and an auxiliary cleaning agent, wherein the main cleaning agent is any one of or a mixture of two of 1,1,2,2,3-pentafluoropropane, perfluoroether and propyl bromide; the azeotropic solvent is a mixture of any two of absolute ethyl alcohol, isopropyl alcohol and n-butyl alcohol; the auxiliary cleaning agent is any one of or a mixture of two of ethylene glycol monomethyl ether, ethylene glycol monoethyl ether and diethylene glycol monomethyl ether; the cleaner comprises, in percentage by weight, 50%-65% of the main cleaning agent, 10%-25% of the azeotropic solvent and 15%-30% of the auxiliary cleaning agent. The invention further provides a preparation method of the environment-friendly flame-retardant solvent cleaner. The solvent cleaner has high cleaning capability and good cleaning effect, is flame-retardant, non-toxic and odorless, cannot pollute the environment or the atmosphere and is a real flame-retardant and environment-friendly industrial cleaner.

The invention provides a nitrile rubber sealing ring. According to the technical scheme, the nitrile rubber sealing ring comprises a main material and an auxiliary material. The main material comprises nitrile rubber, the auxiliary material comprises silicone rubber, perfluoroether rubber, polyether-ether-ketone, chlorosulfonated polyethylene, a vulcanizing agent, a softener, an adhesive, an accelerant DPTT, a reinforcing agent, a flame retardant and color masterbatch, and the softener is composed of paraffin and asphalt. The vulcanizing agent is made of N '-phenylene bismaleimide. The nitrilerubber sealing ring has the beneficial effects that the silicon rubber, the perfluoroether rubber and the polyether-ether-ketone are added according to a proper proportion, so that the temperature resistance is effectively improved, and the nitrile rubber sealing ring can be used for a long time in a high-temperature environment; in addition, the performance of the sealing ring is comprehensivelyimproved by adding the chlorosulfonated polyethylene and the vulcanizing agent, the flame retardant effect of the sealing ring is greatly improved by adding the flame retardant, and fire accidents are also reduced.

The invention belongs to the technical field of catering supplies, and provides a degradable meal box which comprises a box body and a box cover. The box body and the box cover are both made of polylactic acid composite materials. The box body and the box cover are made of the following materials: 97-99 parts of right-spiral polylactic acid, 1-3 parts of left-spiral polylactic acid, 5-50 parts ofvinyl acetate, 2-5 parts of chain extender and 1-5 parts of flexibilizer, and 100-200 parts of ethyl butyl perfluoroether, 200-600 parts of organic alcohol, 80-200 parts of organochlorosilane and 30-100 parts of trialkyl monochlorosilane. Compared with the existing degradable meal box, the preparation process is simpler and more environment-friendly, the high-temperature resistance of the meal boxis improved and the ingredients of the degradable meal box contain vinyl acetate and thus the flexibility of the meal box is improved.

Disclosed is a method of lubrication including a step of lubricating a machine with a lubricating composition, the lubricating composition including 20-100% ionic liquid or of a mixture of several ionic liquids. The ionic liquid or the mixture is selected from at least: an anion A⁻ chosen from sulfonylimides, the substituent(s) of which is (are) independently chosen from a fluoroalkyl, fluoroether, perfluorinated alkyl or perfluoroether group; and a cation C⁺ including a nitrogen-containing heterocycle or a quaternary ammonium, the substituent(s) of which is (are) independently chosen from: a hydrogen atom or alkyl, alkoxy, fluorinated alkyl, perfluorinated alkyl, alkylsilane, alkyl alcohol, vinyl, alkyl allyl, ether or polyether groups having a linear or branched chain having 1-3 carbon atoms. The deposition start temperature in thin film of the ionic liquid or of the mixture of ionic liquids is at least equal to 330° C. The lubricating composition reduces deposits formed in the machine.

The invention relates to perfluoroether-based polysiloxane as well as a preparation method and application thereof. The perfluoroether-based polysiloxane has a structure characteristic as shown in a formula (I). The perfluoroether-based polysiloxane can have excellent performance of a low-temperature-resistance property, a viscosity-temperature property, stability, corrosion resistance and anti-wear capacity, further, is little in evaporation loss, and can be applicable to the fields, with severe environments, of aerospace, special industry and the like.

The invention provides a straight-chain polyperfluoroether compound with a hydroxyl-containing terminal group and a preparation method thereof. The compound does not contain a branched chain structure, the molecular structure is neater, the compound is smoother, meanwhile, the compound has better viscosity-temperature characteristics, and the application range is wider. The straight-chain polyperfluoroether compound with the terminal group containing the hydroxyl group has a structural formula I shown in the specification; in the structural formula I, m is greater than or equal to 1, and n isgreater than or equal to 1.

The invention belongs to the technical field of perfluoroether rubber compositions, and discloses a low-temperature-resistant perfluoroether rubber composition as well as a preparation method and application thereof. The composition can be vulcanized and molded into a low-temperature-resistant perfluoroether rubber product. The low-temperature perfluoroether rubber composition comprises 50-100 parts by weight of perfluoroether rubber, 10-50 parts by weight of a liquid fluororubber elastomer, 0.5-3 part by weight of a cross-linking agent, 0-4 parts by weight of an accelerant, 1-30 parts by weight of a filler and 1-3 parts by weight of a processing aid; a rubber product prepared by heating, pressurizing and vulcanizing the composition has excellent low-temperature resistance and high cost performance, and can be widely applied to low-temperature corrosion-resistant environmental conditions in petrochemical industry.

The invention belongs to the technical field of high polymer material preparation, and particularly relates to high-temperature-resistant ultrapure perfluoroether rubber and a preparation method thereof. The high-temperature-resistant ultrapure perfluoroether rubber is prepared from the following components in parts by mass: 80 to 120 parts of peroxide perfluoroether rubber; less than or equal to 10 parts by mass of a dispersant; 5-25 parts by mass of fumed silica; less than or equal to 10 parts by mass of an accelerant; and less than or equal to 10 parts by mass of a vulcanizing agent. The perfluoroether peroxide rubber used in the invention can resist the temperature of 300 DEG C, and has excellent medium resistance; the fumed silica is adopted to improve the high temperature resistance and mechanical properties of the material, and the dispersant is adopted to ensure the processability of the material; the invention relates to ultra-pure perfluoroether rubber with extremely low metal ion precipitation.