48 results about "Polytetrafluoroethylene" patented technology

Communications cable is provided for use in downhole wells wherein the cable will be exposed to a temperature of at least 280° C., the cable including as a component thereof a composition comprising melt-fabricable tetrafluoroethylene/perfluoro(alkyl vinyl ether) copolymer and melt flowable polytetrafluoroethylene, said polytetrafluoroethylene by itself having no tensile property and being present in said composition in an amount effective to enable the component to withstand this temperature, with the high temperature exposure of the cable component being effective to thermally transform the composition in the solid state, thereby obtaining epitaxial co-crystallization.

The invention discloses a method of amphipathy fluorinated multipolymer modifying the surface of tetrafluoroethylene blownfilm. The fluorinated multipolymer is achieved by aggregating of fluorinated (methyl) ACR monomer A and (methyl) ACR monomer B. The preparing and modifying tetrafluoroethylene blownfilm is that: firstly, aggregate the fluorinated (methyl) ACR monomer A and (methyl) ACR monomer B to achieve amphipathy fluorinated random or amphiphilic block or triblock copolymer; then compound the copolymer with the tetrafluoroethylene blownfilm by the way of coating, to prepare hydrophile tetrafluoroethylene blownfilm which can achieve by stretching in one-way or two-way. The prepared hydrophile tetrafluoroethylene blownfilm not only has the characters of age resistant, resistant to chemical attack and wide applicable temperature, but also has good hydrophilicity, large water flux. The method can be suitable for the surface modifying of tabular, tubular and hollow fiber tetrafluoroethylene blownfilm.

The invention discloses an antistatic polyfluortetraethylene film and a preparation method thereof, the method comprises the steps of: at first, utilizing 100 parts of polyfluortetraethylene powders and 1-20 parts of an antistatic agent to be admixed in a high-speed agitator, wherein, such an antistatic agent is a composite antistatic agent consisting of acetylene carbon black, graphite, metal conductive powders and the like; then preparing an antistatic polyfluortetraethylene film by means of mixing raw materials, prepressing and performing, sintering at high temperature, film forming by turning, trimming, winding and the like. The antistatic polyfluortetraethylene film prepared according to the invention has a permanent antistatic effect and can sufficiently dissipate the charges accumulated on the surface thereof owing to friction, the added antistatic agent powders can also cooperate and reinforce therewith to a certain extent, thus overcoming the characteristics of inferior abrasive resistance and low hardness, and improving the mechanical performance of the polyfluortetraethylene.

Provided is a gasket capable of maintaining a high sealing property under a high temperature, in which a gasket basic substance and coverture are not sublimated or decomposed when the gasket is used under a high temperature above 500° C. The gasket for a high-temperature joint includes a gasket basic substance formed by filling a heat-resistant filler mainly composed of diatomaceous earth into gaps of a meshed metallic reinforcing member, and coverture made of a heat-resistant antifriction material mainly composed of a mixture of boron nitride and polytetrafluoroethylene resin for covering a surface of the gasket basic substance.

The invention discloses Mn<4+> doped fluoroaluminate red fluorescent powder as well as a preparation method and an application thereof. The method comprises steps as follows: hydrofluoric acid and water are added to a polytetrafluoroethylene container, K2MnF6 is added and stirred to be dissolved, and then KF is added; after KF is dissolved, K3AlF6 is added and continuously stirred to be completely dissolved, and then the mixture is continuously stirred for 30 min; the mixture is left to stand after stirring is stopped, suction filtration is performed, a filter cake is dried under the vacuum condition at the temperature of 70 DEG C, and the Mn<4+> doped fluoroaluminate red fluorescent powder is obtained. Compared with the prior art, the K3AlF6:Mn<4+> red fluorescent powder is synthesized in a hydrofluoric acid aqueous solution, and the diluted aqueous solution has a function of purifying the K3AlF6 phase; excessive KF.2H2O is added, so that the K3AlF6 phase is crystallized and separated to be purified in the aqueous solution; the obtained fluorescent powder has a narrow emission spectrum range, and the reabsorption phenomenon is effectively avoided; the phase of the synthesized fluorescent powder is pure, and the light emitting efficiency and collection rate are high; the color gamut range of a white light LED device packaged by the fluorescent powder is wide.

The invention discloses a flame-retardant polybutylene terephthalate (PBT) composite material, which is prepared by taking a mixture of montmorillonite and polytetrafluoroethylene as an organic synergistic flame retardant and cooperating with a nitrogen containing flame retardant, and a preparation method thereof. The composite material comprises the following components in percentage by weight: 45-70 percent of polybutylene terephthalate, 1-10 percent of nano-sized organic montmorillonite and 10-30 percent of glass fiber which is subjected to surface treatment, and 10-30 percent of nitrogen containing flame retardant, wherein the nano-sized organic montmorillonite is montmorillonite mineral powder processed by an alkyl intercalating agent; and the glass fiber is alkali-free glass fiber processed by a coupling agent. The preparation method comprises the following steps of mixing the components, antioxidant and lubricating agent; melting, blending and extruding the mixture by a double-screw extruder to obtain the polybutylene terephthalate composite material which has high performance and is synergistically filled by montmorillonite and glass fiber. The composite material is high in modulus, good in toughness, high in temperature resistance and high in CTI value; the processing environment is friendly; the composite material are free of halogen and phosphorus, meets an ROSH (The Restriction of the use of Certain Hazardous Substances in Electrical and Electronic Equipment) principle, and is widely applied to the field of engineering plastics.

The invention relates to an aqueous anti-adhesion coating. The coating contains polyethersulfone (PES), polytetrafluoroethylene, a pigment, water and a solvent. The aqueous anti-adhesion coating solves the problem of shedding of a film, and makes aqueous coatings be especially suitable for an iron substrate. The coating can be individually used to form the coating layer of an article, and also can be used to form any layer of a multilayer non-adhesion coating.

The invention discloses a method of synthesizing a nano zinc silicate light emitting material by using waste silicon powder by a hydrothermal method. The method comprises the following steps: (1) dissolving Zn(CH3COO)2.2H2O, Mn(NO3)2.4H2O and hexadecyl trimethyl ammonium bromide in deionized water, adding the waste silicon powder, stirring for 15 minutes, adding sodium hydroxide or ammonium water with concentration being 25%, and stirring for 10 minutes to obtain a mixed solution; (2) putting the mixed solution prepared in the step (1) in a reaction kettle with the liner being polytetrafluoroethylene, sealing the reaction kettle, putting the kettle in an oven at 130-200 DEG C to react for 12-48 hours, taking, naturally cooling to room temperature, washing the product by distilled water. carrying out centrifugal separation, and naturally drying to obtain the zinc silicate light emitting material. By using waste silicon powder as a raw material, the method disclosed by the invention expands the range of reactants and can fully utilize industrial leftovers and achieve the purpose of recycling resources. Furthermore, the method disclosed by the invention which is a hydrothermal one-step reaction is simple and feasible and low in energy consumption.

The invention discloses a preparation method of graphene quantum dots. The method comprises the following steps: a. adding pyrene into concentrated nitric acid, carrying out a condensation reflux reaction at 80 DEG C for 24-48 h, adding excess deionized water after the reaction is completed and performing suction filtration by using a filter membrane, performing repeated suction filtration and washing until the pH of a solution is neutral, and then placing the reaction product in a vacuum oven for oven-drying at 65 DEG C-85 DEG C to obtain trinitropyrene; b. weighing trinitropyrene and sodiumsulfite and performing dissolving in ethanol and performing uniform stirring, transferring the solution into a reaction kettle with a polytetrafluoroethylene substrate, and carrying out a reaction ata high temperature of 180 DEG C-210 DEG C for 10 h-12 h; and c. filtering the reaction product through a 0.22 [mu]m filter membrane to remove unreacted particles after the high temperature reaction iscompleted, then performing purification by a column chromatography separation method, and performing drying to obtain a yellow-brown solid powder, namely the graphene quantum dots. The hydrophobic graphene quantum dots prepared by the method can detect water content in organic solvents according to changes of fluorescence, and carry out cell imaging.

The invention discloses an insulated fireproof coating for optical cables. The insulated fireproof coating comprises, by weight, solvent oil No.200, ethylene glycol, silicate, glass powder, calcium carbonate, polytetrafluoroethylene powder, epoxy resin, porcellanite, aluminum oxide, silicon nitride, antimony trioxide, mica powder, silicon carbide, maleic anhydride, silicone rubber, vermiculite, titanium dioxide, melamine, pentaerythritol, mineral fibers, powdery polyvinyl chloride, boride and an auxiliary agent, wherein the auxiliary agent refers to a leveling agent or defoaming agent. The insulated fireproof coating for the optical cables has the advantages that the coating is excellent in fireproof, insulated and flame-retardant performance and highly resistant to high temperature; when the coating expands after being heated, a compact uniform fireproof heat-insulated layer is formed; the coating has excellent physical and chemical properties and is quick to dry, resistant to damp, acid, base and water and remarkable in fireproof and heat-insulated effect, so that safety of electric wires and cables can be guaranteed effectively.

The invention belongs to the technical field of plastic and discloses a shell plastic for computer display screens and a preparation method of the shell plastic. The shell plastic is prepared from, by weight, 35-40 parts of acrylonitrile-butadiene-styrene copolymer, 15-20 parts of polycarbonate, 8-10 parts of polyvinyl chloride, 6-8 parts of polytetrafluoroethylene, 3-5 parts of chlorinated polyethylene, 5-7 parts of silicon rubber, 3-5 parts of polybismaleimide, 5-8 parts of 2-hydroxy-4-octoxydiphenyl ketone, 4-6 parts of molybdenum disulfide, 8-12 parts of red phosphorus, 7-9 parts of melamine polyphosphate, 16-18 parts of calcium carbonate, 10-13 parts of magnesium hydroxide, 7-11 parts of a plasticizer, 2-4 parts of a lubricant, 1-2 parts of a stabilizer and 2-4 parts of an antistatic agent. The shell plastic is simple in preparation, excellent in physical performance and great in fire resistance and high temperature resistance.

The invention discloses a high-heat-resisting self-lubricating PVC/NBR composite foam board and a preparation method thereof. According to the composite foam board, PVC is blended with NBR, waste rubber powder, maleic anhydride grafted polyethylene, and polytetrafluoroethylene micropowder modified by silane coupling agent to serve as a foaming base material, the compatibility of the materials is good, the foam board achieves excellent heat resistance, self-lubrication and mechanical strength, the foam board is combined with other materials to finally prepare a composite sheet, the surface of the composite sheet is smooth, an internal structure of the composite sheet is even, the surface of the composite sheet is lyophobic and antifouling, and the composite sheet is economic and environment-friendly, and has an excellent application prospect in various fields.

The invention discloses a method and a device for calibrating a while-drilling remote detection electromagnetic wave resistivity logging instrument. The device comprises two elliptical discs, a fixingframe, a limiting rod, a sleeve and a fastening handle, wherein the two elliptical discs are connected and fixed by glass fiber reinforced plastics or other non-metal materials; two dials are elliptical and are made of the glass fiber reinforced plastics or other non-metal materials; the two dials are limited by a glass fiber reinforced plastic connecting rod; a middle connecting rod hole has a wire passing effect; the fixing frame is divided into an upper part and a lower part and is made of super-hard aluminum; the dials are fixed in the middle by bolts; a polytetrafluoroethylene lining isembedded in the fixing frame; a locking device is arranged at the bottom of a lower dial frame to prevent the dial frame from rotating and falling off; and full verification is performed in the designand debugging process of an instrument prototype. The device is easy to manufacture and operate; and by externally connecting a resistor and a capacitor, the complex impedance of a dial ring can be simply and accurately adjusted, so that the instrument is convenient to debug, the standard of measurement parameters is convenient to establish, and the instrument can accurately obtain required scalecoefficients of each parameter.

The invention discloses a preparation method of an Ag2Se/GO nano material with a micro-flower structure and application of the nano material in photocatalytic degradation of textile waste liquid. Thepreparation method comprises the following steps: pouring a mixed solution containing a silver source and a selenium source into a high-pressure reaction kettle which is lined with polytetrafluoroethylene and contains graphene oxide sheets, and then sealing and placing in a reaction furnace to perform heating for reaction to obtain the nano material with the Ag2Se/GO micro-flower structure, wherein the mixed solution containing the silver source and the selenium source is prepared by dissolving silver nitrate in deionized water, adding EDTA, mixing uniformly, adding selenium powder and sodiumborohydride into the mixed solution, and stirring uniformly. The Ag2Se/GO nano material with the micro-flower structure synthesized by the preparation method has excellent photocatalytic performance and can be used as a photocatalyst to purify textile wastewater, degrade colored dyes and the like.

The invention relates to a heat-resistant and wear-resistant natural rubber composite material and a preparation method thereof, belongs to the technical field of composite materials, and aims to solve the technical problem of poor wear resistance of natural rubber in the prior art and further improve the heat resistance. The composite material provided by the invention is prepared from followingraw materials in parts by weight: 100 parts of natural rubber, 2 to 4 parts of polyvinylidene fluoride, 5 to 8 parts of epoxy resin, 1 to 3 parts of sulfur, 0.5 to 2 parts of a vulcanization accelerator, 0.5 to 2 parts of zinc oxide, 1 to 2 parts of stearic acid, 2 to 5 parts of an anti-aging agent, 1 to 3 parts of shell powder, 0.5 to 2 parts of silicone stone powder, 0.5 to 1 parts of graphite,1 to 2 parts of calcium carbonate and 2.5 to 3.5 parts of polytetrafluoroethylene powder. The composite material has superior wear resistance and heat resistance.

The invention discloses a high-temperature-resistant insulation material applied to power equipment. The high-temperature-resistant insulation material is prepared from the following components in parts by weight: 10-30 parts of polyethylene, 2-10 parts of polyperfluorinated ethylene propylene, 7-10 parts of mica powder, 3-6 parts of butyl rubber, 3-5 parts of inorganic glass fiber, 7-8 parts of ethylene-propylene-diene-terpolymer rubber, 3-10 parts of polytetrafluoroethylene powder, 3-10 parts of alkali-free glass fiber cloth, 3-10 parts of ultraviolet light absorbents, 3-10 parts of epoxy resin, 1.5-3.5 parts of antioxidants and 0.5-5.5 parts of plasticizers. The invention provides a high-temperature-resistant insulation material applied to power equipment and a preparation method thereof. The prepared insulation material has excellent mechanical property, insulation property and high-temperature-resistant property, also has water resistance, weathering ageing resistance and high abrasion resistance, and can meet the requirements of the power equipment on high-temperature resistance and excellent mechanical property.

The invention discloses a synthesis method for a porous ZnCo2O4 nanosheet and a pseudo-cubic micro-nano structure. The synthesis method comprises the following steps: (1) weighing CTAB (CetyltrimethylAmmonium Bromide), and dissolving in the mixed solution of deionized water and ethylene glycol at a constant temperature to obtain settled solution; (2) weighing Zn(NO3)2.6H2O, Co(NO3)2.6H2O and ureaat the molar ratio of 1:2:15, dissolving in the solution obtained in (1), and fully stirring; (3) transferring the solution obtained in (2) to a polytetrafluoroethylene lining stainless steel reaction kettle, sealing, and reacting for 3-20h at the temperature of 100-180 DEG C; (4) after reaction is finished, naturally cooling to room temperature, carrying out centrifugation, respectively cleaningwith the deionized water and absolute ethyl alcohol for three times, and drying to obtain a Zn-Co precursor. According to the synthesis method, through the simple regulation and control of reaction parameters, the micro-nano structure of ZnCo2O4 of different morphologies can be obtained through synthesis.

The invention discloses a high temperature direct formate fuel cell (Na-DFFC) with electricity and alkali salt co-production belonging to the field of fuel cells, including a non-platinum cathode and a non-platinum anode using polytetrafluoroethylene (PTFE) as a binder, and a cationic membrane of a sodium ion form. Compared with traditional formate fuel cells, additional electrolyte (such as sodium hydroxide) is not required to be added to the Na-DFFC anode, so that the energy density of the system is improved, and the design complexity and cost of the system are reduced. In addition, by replacing the traditional anionic membrane with the cationic membrane of a sodium ion form, the shortcomings of poor thermal stability and poor chemical stability of the anionic membrane are overcome. At the same time, by replacing the traditional ion exchange resin binder with the polytetrafluoroethylene (PTFE), the fuel cell compared with the traditional fuel cell is more resistant to high temperature. In addition, important chemical raw materials including sodium hydroxide and sodium carbonate are produced along with electricity outputting by the Na-DFFC, that is, forming the so-called electricity and alkali salt co-production, so that the range of applications is very wide.

The invention discloses a combined compressor multielement penetration compound layer piston ring, comprising a main piston ring and an inner auxiliary piston ring which are equal in height and are combined for use, wherein notches and bosses corresponding to the notches are respectively formed on the main piston ring and the inner auxiliary piston ring; the bosses are located in the corresponding notches; the height value of the outer ring side of the main piston ring is two times the height value of the inner ring side; the height value of the outer ring side of the inner auxiliary piston ring is a half of the height value of the inner side ring; the thickness values of the inner ring sides and the outer ring sides of the main piston ring and the inner auxiliary piston ring are identical and are equal to the distance value between the outer ring sides and the inner ring sides; a multielement penetration compound layer with the thickness of 0.08-0.12 mm is arranged on the outer cylindrical surface of the main piston ring; a polytetrafluoroethylene not-sticky coating is arranged on the multielement penetration compound layer; the two notches are arranged in a staggered way. The combined compressor multielement penetration compound layer piston ring is characterized in that a U-shaped unloading groove is formed in the outer cylindrical surface of the main piston ring. The piston ring can be used for effectively sealing the gap between the notches, and the sealing property of the piston ring is improved.

The invention discloses a preparation method of a composite fiber membrane with efficient filtration. The preparation method comprises the steps of S1, mixing polytetrafluoroethylene, N,N- dimethylacetamide and polyethylene glycol, and stirring the mixture to obtain a colloidal solution that is a first spinning solution; S2, mixing polypropylene, N,N-dimethylacetamide, polyethylene glycol and silicon dioxide, and stirring the mixture to obtain another colloidal solution that is a second spinning solution; S3, corresponding the first spinning solution and the second spinning solution to a firstspinning nozzle and a second spinning nozzle, respectively; and S4, controlling flow rates of the first spinning solution in the first spinning nozzle and the second spinning solution in the second spinning nozzle for electrostatic spinning, and forming the composite fiber membrane on a flat-plate receiver. The preparation method of the composite fiber membrane is simple and the composite fiber membrane has higher filtration efficiency.

The invention relates to a preparation method of a chitosan-based spherical negative lithium ion battery carbon electrode. The preparation method comprises the following steps: taking chitosan as a raw material, dissolving the chitosan in a certain proportion of hydrochloric acid solution, stirring at a room temperature for 3 hours, then heating to a certain temperature, stirring for several hours, adding a uniformly mixed solution into a polytetrafluoroethylene-lined stainless steel reaction kettle, sealing, then reacting at the temperature of 120-200 DEG C for 5-12 hours, naturally cooling to a room temperature, filtering, washing and drying to obtain hydrothermal charcoal with the particle size distribution of 1-6 microns, then performing high-temperature carbonization in an inert atmosphere to obtain the nitrogen-containing spherical negative carbon electrode. By the preparation method, the raw material is cheap and easy to obtain, a synthesis technology is simple and easy to implement, a negative electrode material is stable and non-toxic in air, is used as the negative electrode material of a lithium ion battery and shows superior electrochemical performance.

The invention relates to a preparation method of flexible hydrophobic reversible photochromic wood and wood prepared thereby, and belongs to the field of wood manufacturing. The method comprises the following steps: removing lignin of a wood sample by using alkali liquor, then immersing the wood sample into an ethanol solution of a spiro-oxazine photochromic compound; blending epoxy resin crystalglue and hard glue, injecting the blend into a polytetrafluoroethylene mold, placing the glue layer on a plant leaf with a natural super-hydrophobic property, carrying out vacuum constant-temperaturestanding for 12-24 hours, and taking down the leaf to obtain a polytetrafluoroethylene mold with a reverse super-hydrophobic structure; blending epoxy resin crystal glue and flexible glue, injecting the blend into a mold, putting a wood sample on the glue surface, removing bubbles in the glue solution and ethanol molecules in the wood sample, standing for 12-24 hours at a constant temperature, andpeeling off the wood sample from the mold to obtain the flexible hydrophobic reversible photochromic wood. Raw materials used in the method are environmentally friendly, the method is simple, reaction conditions are mild, and various shapes can be customized according to use requirements.

The objective of the present invention is to provide a tube which is formed from a fluororesin and has excellent tearability and inner surface smoothness. A tube formed from a fluororesin according to the present invention is tearable in the longitudinal direction, and is formed from one thermoplastic fluororesin that is different from polytetrafluoroethylenes.

The invention relates to a method for preparing a CuO@carbon cloth flexible electrode material through one step by regulating and controlling an interface cavitation effect. A carbon cloth matrix withdifferent gas infiltration states on the surface is obtained by regulating and controlling the infiltration method and time of carbon cloth in a polytetrafluoroethylene (PTFE) solution with a specific concentration; the CuO@carbon cloth electrode material with different interface structures is prepared by using a copper salt as raw material and ammonia water as a guiding agent, preparing a precursor solution, changing a carbon cloth fixing position and regulating and controlling aeration process conditions (aeration time, continuous or intermittent operation, simultaneous execution with ultrasonic application or not and gas flow rate). According to the method, the active control of the cavitation effect at the solid surface is realized by coordinatively regulating and controlling the gasinfiltration state of the solid surface and the aeration process conditions, and a CuO@carbon cloth electrode with controllable supporting capacity is obtained. The structural characteristics such asthe supporting capacity and distribution of CuO on the surface of the carbon cloth are changed, and the method has the advantages of being simple, high in efficiency, easy to carry out, controllable in CuO supporting capacity and the like and has great development potential.