4070 results about "Polytetrafluoroethylene" patented technology

The invention belongs to the technical field of polymer plastic materials, and particularly relates to a high-temperature-resistant anti-corrosion polytetrafluoroethylene material and a preparation method thereof. The polytetrafluoroethylene is prepared from the following raw materials in parts by weight: 50 to 60 parts of polytetrafluoroethylene, 5 to 10 parts of fluorinated modified graphene oxide, 3 to 5 parts of aluminum powder, 5 to 8 parts of modified silicon carbide fiber, 3 to 5 parts of silane modified nano silicon dioxide, 2 to 3 parts of polyphenylene sulfide, 2 to 3 parts of polyimide, 0.5 to 0.8 part of dispersing agent and 0.5 to 1 part of antioxidant. The heat conduction performance and the interface bonding force are improved through the fluorinated modified graphene oxide, the impact resistance and the wear resistance are enhanced through the silicon carbide fibers, and the corrosion resistance and the wear resistance are improved through the aluminum powder; silane modified silicon dioxide enhances the mechanical property of the composite material by improving the dispersity of the filler, and PPS and PI interact with the surface of the filler through polar groups in molecular chains, so that the interface strength is improved, and the toughness and the thermal stability are improved.

The invention relates to a photo-thermal super-hydrophobic multifunctional anti-icing coating as well as a preparation method and application thereof. The photo-thermal super-hydrophobic multifunctional anti-icing coating comprises primer and finish paint, the primer comprises the following raw materials in parts by weight: 20-25 parts of bisphenol A type epoxy resin and / or fluorine modified epoxy resin, 10-20 parts of fluorine modified polyacrylic resin and / or polyurethane resin, 5-10 parts of a curing agent and 40-55 parts of a solvent; the finish paint comprises the following components in parts by weight: 2-5 parts of polytetrafluoroethylene, 1-3 parts of soluble polytetrafluoroethylene, 1-5 parts of polydimethylsiloxane and 85-90 parts of fluorinated MOF dispersion liquid. Compared with the prior art, the photo-thermal super-hydrophobic multifunctional anti-icing coating provided by the invention has the characteristics of super-hydrophobicity, rapid ice melting, wear resistance, reduction of ice adhesion strength and reduction of icing amount, can effectively solve the problem of icing of an aluminum conductor of a power transmission line of a power system, and can be applied to power equipment such as the aluminum conductor of the power transmission line.

The invention relates to an insulating weather-resistant powder coating and a preparation method thereof, and belongs to the technical field of coatings, and the powder coating comprises composite modified resin, a dual curing agent, a functional filler, a polyacrylate leveling agent, fumed silica, a benzotriazole ultraviolet light absorber, polytetrafluoroethylene wax powder and the like. A core-shell structure of the composite modified resin is designed, high insulativity is kept through a silane modified epoxy core layer, a weather-proof barrier is provided through an acrylic acid shell layer, and the phase separation problem is solved through interface chemical bonding; a dual-curing mechanism is designed, and isocyanate and acrylic hydroxyl react to form an interpenetrating network while an epoxy core layer is cured by anhydride; a filler synergistic effect is designed, silane coupling agent modified nano boron nitride forms a three-dimensional heat-conducting insulating network, and rutile type titanium dioxide is coated with silicon dioxide, so that ultraviolet aging is resisted. All the components cooperate with one another, so that the coating has excellent insulativity, weather resistance, adhesiveness and the like at the same time.

The invention relates to the technical field of welding wire preparation, in particular to a nickel-based alloy flux-cored wire for 9Ni steel welding and a preparation method of the nickel-based alloy flux-cored wire. A nickel-based alloy flux-cored wire for 9Ni steel welding comprises a flux core, and the flux core comprises, by weight, 26%-34% of titanium dioxide, 3%-5% of ferrozirconium, 8%-12% of ferrotitanium, 1%-3% of rare earth ferrosilicon, 15%-20% of tungsten powder, 1%-2% of polytetrafluoroethylene and the balance pretreated mixed powder. The nickel-based alloy flux-cored wire for 9Ni steel welding has the advantages that low-melting-point eutectic is not prone to being formed, the hot crack sensitivity is reduced, the nickel-based alloy flux-cored wire is suitable for welding of restrained large structures, the deoxidation and denitrification capacity is enhanced, and the pore sensitivity is reduced.

The invention provides an anti-corrosion Teflon coating as well as a preparation method and application thereof, and belongs to the technical field of coatings. The preparation method comprises the following steps: irradiating polytetrafluoroethylene micro-powder, performing graft modification on the irradiated polytetrafluoroethylene micro-powder and glycidyl methacrylate, reacting with phosphorus oxychloride and polydopamine modified graphene, adding into a Teflon primer, and uniformly stirring and mixing to obtain the anti-corrosion Teflon coating. The anti-corrosion Teflon coating prepared by the invention has good high-temperature resistance, corrosion resistance, rust resistance, mechanical properties, wear resistance, scratch resistance, medium resistance and the like, can effectively resist high-wear-resistance environments such as sliding friction, impact friction and cavitation friction and high-corrosion environments such as acid media and alkaline media, and has a wide application prospect.

The invention relates to the field of polytetrafluoroethylene particle recovery, in particular to a polytetrafluoroethylene particle recovery device. A treatment box is installed on the upper portion of a machine body, the interior of the treatment box is connected with a discharging pipe through a guide channel, the discharging pipe is installed in the treatment box arranged on one side of the machine body, and a guide slope is arranged at the bottom end of the treatment box; a partition plate and a separation screen are installed on one side of the upper portion of the guide slope, a recycling roller mechanism is arranged on one side of the upper portion of the separation screen, and a discharging port is formed in the position, away from the lower portion of the separation screen, of the lower portion of the separation screen. According to the polytetrafluoroethylene particle cleaning device, polytetrafluoroethylene particles enter the treatment box to be cleaned after being primarily processed and crushed, waste particles are screened through a separation screen and an air nozzle during cleaning, the particles float to the top and are fished and recycled through a recycling roller mechanism, and a multi-stage screen and a spiral conveying mechanism are arranged in the recycling roller mechanism; particles can be effectively classified, screened and conveyed, the recycling effect of the material particles is guaranteed, impurity doping can be avoided, and the production quality is improved.

The invention discloses a solvent-resistant foaming material and a preparation method thereof, and relates to the technical field of high-molecular compound rubber foaming materials. The solvent-resistant foaming material is prepared from the following raw materials in parts by mass: 90 parts of a basic polymer, 5-25 parts of a chemical foaming agent, 0.5-5 parts of a cross-linking agent, 0.5-8 parts of a foaming aid, 5-40 parts of filler, 10-30 parts of a solvent-resistant modifier, 0.5-5 parts of a processing aid and 0.5-1.5 parts of an anti-aging agent. Through the synergistic effect of the base polymer (the nitrile rubber and the butadiene rubber are mixed according to the ratio of 1: 1) and the solvent-resistant modifier (such as polytetrafluoroethylene powder), the problem that a traditional foaming material is easy to swell and deform in an organic solvent environment is solved. On the trend, the volume swelling rate and the mass change of the material in a solvent are effectively reduced, the infiltration resistance is enhanced, the structural integrity of the material is kept when the material is in contact with lubricating oil or an alcohol solvent for a long time, and therefore the service life of a sealing piece is prolonged.

The invention provides a PTFE foam coating multifunctional dedusting and denitration filter material and a preparation method thereof, and the technology is realized through the following steps: firstly preparing an efficient denitration catalyst, then preparing a dedusting filter material taking double base cloth as a substrate, and enhancing the structural stability through a special process. Then, the catalyst powder is uniformly impregnated in the substrate layer and dried to ensure the maximization of the catalytic activity. Then, a PTFE foaming coating is prepared, the surface of the needled felt is accurately coated with the PTFE foaming coating, the uniformity of the coating and the strong adhesive force of the coating and the base material are ensured through a gradient drying technology, and preparation of the multifunctional dust removal and denitration filter material is completed. According to the filter material, the PTFE foam coating and the efficient catalyst are combined, the integrated removal efficiency of various pollutants in industrial flue gas is effectively improved, the filter material is suitable for large-scale production, the cost effectiveness is optimized, the filter material has obvious advantages in economical efficiency and market application, and an efficient and economical solution is provided for industrial flue gas purification.

The invention discloses a PA6 nylon composite material for a high-temperature-resistant filter screen and a preparation method of the PA6 nylon composite material, and relates to the technical field of composite materials. The invention discloses a PA6 nylon composite material for a high-temperature-resistant filter screen. The nylon material is prepared from the following raw materials in parts by weight: 60 to 80 parts of modified PA6 nylon, 10 to 20 parts of modified glass fiber, 2 to 5 parts of montmorillonite, 0.3 to 0.8 part of antioxidant 1010, 0.2 to 0.6 part of stearic acid, 0.5 to 1.0 part of ethoxylated fatty amine, 1 to 3 parts of nano titanium dioxide, 1 to 3 parts of polytetrafluoroethylene micro powder, 3 to 8 parts of aluminum hydroxide, 0.5 to 1.5 parts of chitosan, 1 to 3 parts of hyperbranched polyamide and 0.5 to 1.5 parts of urea-formaldehyde resin coated epoxy resin microcapsules. And 0.3 to 0.8 part of sodium polyacrylate. The PA6 nylon composite material for the high-temperature-resistant filter screen has remarkable advantages. The material disclosed by the invention is high in mechanical property, good in thermal stability and stable in size at high temperature; the self-cleaning, antibacterial and antistatic functions are realized, and the filtering efficiency is high; chemical corrosion resistance, wear resistance and low water absorption are achieved; part of the raw materials can be recycled, the environmental protection concept is met, and the use requirement of the high-temperature-resistant filter screen in a complex environment can be met.

The invention relates to the field of materials, and provides an asynchronous stretching polytetrafluoroethylene film with high aperture uniformity and a preparation method thereof. The method comprises the following steps: mixing polytetrafluoroethylene dispersion resin with mixed lubricating oil, curing, and then obtaining the polytetrafluoroethylene film through pre-pressing extrusion, multi-module longitudinal stretching and expanding and sizing, wherein the longitudinal stretching module is provided with three sections of temperature zones which are sequentially and adjacently connected, namely a core stretching deoiling zone, a high-temperature activation zone and an annealing rolling zone. Oil-containing stretching is realized by matching mixed lubricating oil with gradient temperature configuration and precise control of stretching speed in a longitudinal stretching stage, and meanwhile, controllability of pore size and high uniformity of pore size are realized by matching proper process parameters such as two-way stretching temperature, speed and multiple; the membrane can be applied to various different scenes as a filtering material.

The invention discloses equipment for testing the moisture permeability of a polytetrafluoroethylene breathable film, and the equipment comprises a box body which is provided with a cover plate which can be movably opened; the detection partition plate is arranged in the middle section of the box body, a detection through opening is formed in the center of the detection partition plate and used for installing a polytetrafluoroethylene breathable film to be detected, and the detection partition plate divides the box body into a lower heating cavity and an upper detection cavity; the heating device, the temperature sensor and the water circulation system are mounted in the lower heating cavity; and the humidity sensor is arranged on the upper detection cavity. The detection partition plate is arranged in the middle of the box body, meanwhile, the hole is formed for mounting the polytetrafluoroethylene breathable film to be detected, the whole box body is divided into the lower heating cavity and the upper detection cavity, the lower heating cavity heats detection liquid to generate water vapor, the upper detection cavity performs detection through the humidity sensor, the function of detecting the water vapor permeation amount of the breathable film is achieved, cost is low, and detection efficiency is high. Detection is convenient and efficient.

The invention discloses a passive radiation refrigeration coating and a preparation method thereof, and relates to the technical field of industrial coatings. Comprising a fluoroacrylate emulsion, hollow glass beads, nano titanium dioxide, flaky silicon dioxide aerogel powder, polytetrafluoroethylene micro powder, hydroxyl-terminated polydimethylsiloxane, a hydroxyl acrylic acid modified silane coupling agent, a super-hydrophobic modified fluorosilicone surface additive, nano cerium oxide, aluminum fluoride doped zinc oxide infrared enhancement powder and deionized water. The paint is prepared on the basis of the formula. According to the invention, a multi-scale spectrum regulation and control and surface self-cleaning system is constructed cooperatively, so that the synergistic effect of high reflection of a sunlight region and high emission of a middle infrared region is realized. The coating can maintain continuous passive refrigeration in a day and night period, the surface of the coating has self-cleaning capability and excellent ultraviolet aging resistance, and high reflectivity and high radiation emissivity can be maintained for a long time in a complex outdoor environment, so that the thermal management efficiency of buildings and equipment is remarkably improved.

The invention relates to the technical field of insulating materials, in particular to insulating powder and a preparation method thereof. The invention discloses a flame-retardant coating which comprises the following components in parts by weight: 15-25 parts of epoxy resin, 10-20 parts of aluminum hydroxide, 5-12 parts of nano boron nitride, 1-3 parts of a silane coupling agent KH-560, 3-8 parts of polytetrafluoroethylene micro powder, 2-6 parts of fluorine-modified montmorillonite, 4-9 parts of melamine cyanurate, 2-5 parts of nano titanium dioxide, 1-4 parts of a fluorine-modified graphene oxide-polyaniline composite material and 0.5-2 parts of pentaerythritol stearate. The anti-corrosion coating is prepared from the following components in parts by weight: 1 to 3 parts of nano zinc oxide, 5 to 10 parts of glass fiber, 2 to 5 parts of polyhedral oligomeric silsesquioxane-polyimide copolymer, 1 to 4 parts of ferrocenyl epoxy resin and 0.5 to 2 parts of perfluorooctyltriethoxysilane. The insulation powder is high in corrosion resistance, excellent in insulation, heat dissipation and mechanical performance, environmentally friendly in processing, good in adaptability, capable of prolonging the service life of equipment and reducing the cost, suitable for special environments and wide in popularization prospect.

The invention discloses a preparation method of high-efficiency fusible polytetrafluoroethylene (PFA), and relates to the technical field of fluorine-containing polymers. The preparation method comprises the following specific steps: adding high-purity water into a polymerization kettle, starting stirring, adding a surfactant, a dispersing aid, a chain transfer agent and a perfluoroalkyl vinyl ether monomer, controlling the temperature and pressure of the polymerization kettle, adding an initiator solution into the reaction kettle, and initiating a copolymerization reaction; the preparation method comprises the following steps: continuously adding a gas mixture of tetrafluoroethylene and perfluoroalkyl vinyl ether into a polymerization kettle after a polymerization reaction is started, continuously adding an initiator solution into a reaction kettle at a constant speed at the same time, and recovering unreacted monomers in the polymerization kettle after the reaction is finished to obtain a fusible polytetrafluoroethylene (PFA) resin emulsion. The method overcomes the problem of low polymerization efficiency caused by low filling coefficient and long solvent recovery period of the original solvent phase PFA polymerization reaction, and improves the utilization rate of raw materials.

The invention discloses a corn straw nanocellulose reinforced water-resistant fully-degradable mulching film and a preparation method thereof, and belongs to the technical field of agricultural mulching films. The method comprises the following steps: performing two-step DES treatment on corn straws to obtain a nano-cellulose dispersion liquid; a PVA solution with the concentration of 8-12 wt% is prepared; 1-3 wt% of an ultrasonic dispersion silicon source dispersion liquid is prepared; the preparation method comprises the following steps: adding 10 parts of PVA solution, 1.25 parts of silicon source dispersion liquid and 20 parts of glycerol into 100 parts of nanocellulose dispersion liquid to obtain film coating liquid, carrying out curtain coating in a polytetrafluoroethylene mold, and naturally drying to form the film. PVA has good film-forming property but poorer water resistance, and nano cellulose and nano silicon dioxide can be used as green modifiers to be blended with PVA and self-assembled to form a hydrogen bond cross-linking system, so that a'rigid cellulose and silicon dioxide network-flexible PVA matrix 'enhanced structure is formed. Meanwhile, forestry and agricultural residues (corn straw) are adopted as raw materials, nanocellulose is prepared through a two-step deep eutectic solvent (DES), and the problem of high pollution caused by traditional strong acid / strong alkali treatment is solved.

The invention discloses a polyion liquid / polyvinylidene fluoride-hexafluoropropylene-based solid electrolyte with a microscopic liquid phase and a preparation method and application thereof, and the preparation method comprises the following steps: adding a lithium salt into N-methyl-2-pyrrolidone, and stirring until the lithium salt is completely dissolved; then adding imidazolyl polyion liquid to prepare a solution A; adding polyvinylidene fluoride-hexafluoropropylene into N-methyl-2-pyrrolidone to prepare a solution, adding the solution into the solution A, continuously stirring until the solution is fully dissolved to obtain a precursor solution of the solid electrolyte, casting the precursor solution onto a polytetrafluoroethylene mold, and carrying out vacuum drying to obtain the solid electrolyte. And the polyvinylidene fluoride-hexafluoropropylene polymer-based solid electrolyte added with the imidazolyl polyion liquid is prepared by adding the imidazolyl polyion liquid into the polyvinylidene fluoride-hexafluoropropylene polymer-based solid electrolyte. The polymer-based solid electrolyte with a microscopic liquid phase is obtained through an electrolyte preparation process which is mild in condition, simple to operate and easy for large-scale production, and the solid electrolyte has good conductivity and mechanical properties.

The invention discloses a high-entropy layered double hydroxide with a strong strain effect and a preparation method of the high-entropy layered double hydroxide. The preparation method comprises the following steps: firstly, preparing ferric salt, cobalt salt, nickel salt, copper salt and zinc salt into a mixed aqueous solution of five metal salts; preparing sodium hydroxide and sodium carbonate into an alkali source aqueous solution; then mixing and stirring the mixed aqueous solution of the five metal salts and the alkali source aqueous solution to gradually form yellowish-brown precipitates, then transferring the yellowish-brown precipitates into a polytetrafluoroethylene reaction kettle, and further reacting in a drying oven; and finally, carrying out centrifugal separation, deionized water and absolute ethyl alcohol washing and freeze drying on the fully reacted precipitate to obtain brown powdery solid, namely the high-entropy layered double hydroxide. The high-entropy layered double hydroxide can be used for advanced oxidation catalytic degradation of tetracycline antibiotic wastewater, the strong strain effect of the high-entropy layered double hydroxide enhances the benefit of activating peroxymonosulfate to generate active free radicals, the efficiency of degrading water pollutants is improved, and the high-entropy layered double hydroxide has good application prospects.

The invention belongs to the technical field of polytetrafluoroethylene material preparation, and particularly relates to a preparation method of polytetrafluoroethylene ultra-thin filaments. The preparation method comprises the following steps: (1) preparing a mixture of modified cordierite fibers and nano barite; (2) preparing modified poly (p-benzamide) fibers; (3) preparing a modified polytetrafluoroethylene base membrane; and (4) preparing the polytetrafluoroethylene ultra-thin filament. According to the preparation method of the polytetrafluoroethylene ultra-thin filament, the mixture of the modified cordierite fiber and the nano barite, the modified poly-p-benzamide fiber and the polytetrafluoroethylene dispersion resin are compounded for use, so that the breaking strength of the prepared polytetrafluoroethylene ultra-thin filament is ensured, and the evenness unevenness and the elongation at break of the polytetrafluoroethylene ultra-thin filament are reduced.

The invention relates to the technical field of compression molding, and particularly discloses a polytetrafluoroethylene powder molding device which comprises a molding press body and further comprises a regulation and control assembly, the regulation and control assembly is arranged on the lower side of a pressing table, and the regulation and control assembly automatically regulates the size of a lower mold exhaust hole according to the powder weight weighed by a feeding assembly and the mold pressure during pressurization. The size of the exhaust hole in the side edge of the lower die can be automatically adjusted through the adjusting and controlling assembly according to the powder weight weighed by the feeding assembly so as to be matched with the pressurized powder amount, the situation that exhaust is excessive or insufficient during powder raw material pressing is prevented, and in the pressurizing process, the pressure of the die is gradually increased, so that the pressure of the die is gradually increased. The opening degree of the exhaust hole is automatically and gradually reduced, transverse cracks are prevented from being caused, and if residual gas in the powder is not fully exhausted in the pressurizing process, the adjusting and controlling assembly can be controlled again through the auxiliary assembly to adjust the exhaust hole of the lower mold, so that the residual gas is exhausted, and the powder compression molding quality is improved.

The invention discloses a technology for manufacturing a thin film by recycling and calendering a polytetrafluoroethylene material, and belongs to the technical field of high polymer material recycling and processing, the technology for manufacturing the thin film by recycling and calendering the polytetrafluoroethylene material comprises the following steps: crushing waste products, and carrying out three-stage screening impurity removal and melt index detection; after being cleaned by supercritical carbon dioxide, the qualified material is mixed with industrial by-product filler, waste tire rubber powder and the like, low-temperature mixing is conducted through a double-screw extruder, and mixing parameters are automatically regulated and controlled through a tension sensor; performing calendaring forming by a five-roller calendaring unit, preheating the first two rollers, performing differential stretching by the middle three rollers, engraving a micro groove by the third roller, and controlling the thickness precision to be + / -3% by an online thickness gauge; the film is slit after being compounded according to requirements, and scrap edges are crushed and recycled. The method realizes efficient recovery of waste polytetrafluoroethylene, and has the advantages of thorough impurity removal, stable performance, environmental protection and energy saving.

The invention provides a water-based anti-corrosion and wear-resistant coating and a preparation method thereof.The preparation method includes the steps that modified MXene nanosheets and water-based epoxy resin emulsion are evenly mixed, and premixed emulsion is obtained; sequentially adding polytetrafluoroethylene powder, titanium dioxide, aluminum oxide, a base material wetting agent, a dispersing agent, a defoaming agent, a surface adhesion promoter, deionized water and a curing agent into the premixed emulsion under a stirring condition, and uniformly mixing to obtain the water-based anticorrosive wear-resistant coating. According to the water-based anti-corrosion and wear-resistant coating disclosed by the invention, the polytetrafluoroethylene and the modified MXene nanosheet are added into the coating, so that the anti-corrosion performance of the water-based coating is improved, the wear resistance of the water-based coating is also improved, and the defect that the existing water-based coating is slightly insufficient in anti-corrosion and wear-resistant performance is overcome.

The invention discloses a coating type high-molecular flame-retardant material. The composite material is prepared from the following components: organic silicon modified epoxy resin, a bio-based castor oil derivative, hydroxyapatite, carbon nanofibers, expanded graphite, ammonium polyphosphate, zinc borate, nano silicon dioxide, molybdenum oxide, microencapsulated red phosphorus, magnesium hydroxide, melamine cyanurate, aluminum diethylphosphinate, pentaerythritol, trihydroxymethyl phosphine oxide and a silane coupling agent. The coating is prepared from a titanate coupling agent, stearic acid, polyethylene glycol, 2, 6-butylated hydroxytoluene, triphenyl phosphite, 2, 4-dihydroxybenzophenone, sebacic diester, polytetrafluoroethylene micro powder, a modified polydimethylsiloxane flatting agent, organic montmorillonite, a polyether modified silicon defoaming agent and a solvent. The invention has the beneficial effects of high flame retardant efficiency, environmental friendliness, excellent comprehensive performance and excellent processability.

The invention relates to the technical field of cloth paving, in particular to a PTFE (polytetrafluoroethylene) base cloth paving mechanism which comprises a paving platform, and the top end of the paving platform is fixedly connected with a fixing frame; and the local fixing assembly comprises two moving blocks moving in the opposite directions, telescopic cylinders are fixedly connected to the bottom ends of the moving blocks, sliding rods are slidably connected to the inner walls of the telescopic cylinders, and smoothing blocks are fixedly connected to the bottom ends of the sliding rods. When the sliding rod drives the smoothing block to move downwards, the conducting strip synchronously moves on the resistance plate, the conducting strip and the resistance plate form a sliding rheostat, the thicker the base cloth is, the larger the resistance is, and the PLC can calculate the thickness of the base cloth by detecting current changes in a loop. Meanwhile, the current of the slide rheostat can be introduced into the N-stage electromagnet and the S-stage electromagnet, the magnetic field intensity is changed according to the magnitude of the current, then the hardness of the magnetorheological fluid is adjusted, the magnetorheological fluid generates counter-acting force on the sliding rod, and therefore the pressure of the smoothing block on the base cloth is adjusted in a self-adaptive mode according to the thickness of the base cloth.

The invention relates to a stainless steel flux-cored wire and a preparation method thereof, and relates to the technical field of flux-cored wires. The stainless steel flux-cored wire comprises a stainless steel strip and a double-layer flux core, the stainless steel strip is filled with the double-layer flux core, and the filling amount of the double-layer flux core accounts for 20-25% of the total mass of the stainless steel flux-cored wire; the double-layer flux core comprises a rapid reaction layer and an alloy transition layer, the rapid reaction layer comprises an oil stain oxidizing agent, the oil stain oxidizing agent comprises a high-temperature decomposition type organic matter and an inorganic composition, and the inorganic composition comprises copper oxide and ferric oxide with the mass ratio being (1-1.5): 1. The high-temperature decomposition type organic matter comprises polytetrafluoroethylene micro powder and trisodium citrate according to the mass ratio of 1: (3-5), and the alloy transition layer comprises 316L stainless steel powder, metal powder, silicon powder, niobium carbide and rare earth oxide. The invention can effectively avoid hydrogen embrittlement caused by diffusible hydrogen easily formed by compounds in anti-rust oil remaining on the surface of the welding wire during welding and entering a welding seam.

A method for producing low-molecular-weight polytetrafluoroethylene which includes: (1) irradiating high-molecular-weight polytetrafluoroethylene with radiation to a dose of 250 kGy or higher substantially in the absence of oxygen to provide low-molecular-weight polytetrafluoroethylene having a melt viscosity at 380° C. of 1.0×102 to 7.0×105 Pa·s. Also disclosed is a powder containing the low-molecular-weight polytetrafluoroethylene, the powder being substantially free from any of perfluorooctanoic acid and salts thereof.

The invention provides a waterproof and windproof warm-keeping fabric and a production process thereof, and relates to the technical field of textile fabrics, the waterproof and windproof warm-keeping fabric comprises a protective surface layer, a windproof temperature-locking middle layer and a skin-friendly warm-keeping inner layer which are sequentially arranged from outside to inside, and the three layers are compounded through a gradient hot melt adhesive; the protective surface layer is a graphene oxide modified polyester fiber fabric treated by a composite hydrophobic finishing liquid; the windproof temperature-locking middle layer sequentially comprises a non-swelling environment-friendly TPU film, a polytetrafluoroethylene microporous film and a Cs0. 33WO3 modified PA6 / 66 hollow fiber net from outside to inside, and the three are laminated and compounded into an integrated structure through hot pressing; and the skin-friendly warm-keeping inner layer is a bamboo pulp fiber-cotton-skin-friendly antibacterial polyester fiber blended fabric loaded with phase change microcapsules. The fabric disclosed by the invention integrates excellent waterproof, windproof and warm-keeping properties, is suitable for outdoor and cold-proof clothes, and has both functions and comfort.

The invention discloses coating and shaping equipment for a high-breathability PTFE (Polytetrafluoroethylene) waterproof breathable film, which comprises a rack, a base cloth supply device arranged on the rack, a coating device arranged on the rack and used for coating a liquid raw material on the base cloth, a first coagulating basin arranged on the rack and below the coating device, and a cloth in-pool guide device arranged on the rack and at the outlet of the coating device, the cloth in-pool guiding device comprises a plurality of height-adjustable material guiding frames arranged on the machine frame side by side and a water inlet roller guiding mechanism, input material guiding rollers are arranged on the material guiding frames, a plurality of cloth tensioning transition rollers are arranged in the first coagulating tank in the feeding direction, and the connecting line of all the cloth tensioning transition rollers is in a downwards-protruding arc shape. A water outlet guide roller is arranged at one end, far away from the water inlet roller, of the first coagulating tank; a plurality of heaters and a plurality of temperature sensors are arranged in the first coagulating tank; a tension control device for controlling the tension force of the cloth is arranged on the rack, and a traction pressing vehicle for sending out the cloth is arranged on the discharging side of the tension control device on the rack.

The invention discloses a preparation method and application of phytic acid modified zero-valent iron. The method comprises the following steps: (1) mixing phytate and liquid phytic acid according to a molar ratio of (5: 5)-(8: 2), and preparing a buffer solution with the concentration of 0.05-0.5 mol / L; (2) adding micron or nano zero-valent iron into a buffer solution according to a solid-to-liquid ratio of 1: 10 to 1: 50 (g / mL), and transferring to a polytetrafluoroethylene reaction kettle; (3) under the protection of nitrogen, reacting for 6-48 hours under the conditions that the temperature is 20-80 DEG C and the oscillation rate is 100-1000 rpm, and controlling the pH value to be 3.5-5.5; and (4) after the reaction, carrying out suction filtration, ethanol-water alternate washing and vacuum drying to prepare the modified zero-valent iron with the surface coated with the phytic acid iron complex. A stable chelation layer is formed on the surface of phytic acid molecules and zero-valent iron, the oxidation resistance, dispersity and heavy metal adsorption capacity of the material are remarkably improved, and the material is suitable for efficient repair of industrial wastewater.

The invention discloses a water-based surface treatment liquid for a galvanized steel sheet. The water-based surface treatment liquid comprises deionized water and a solid, the solid component comprises the following components in parts by weight: 25-65 parts of water-based cationic polymer resin A in the solid component; the weight part of the compound organosilane coupling agent B in the solid components is 30 to 60 parts; the weight part of the compound lubricating particles C in the solid components is 3-10 parts; wherein the compound lubricating particles C comprise at least one organosilane coupling agent C1 containing unsaturated bonds; and a mixture of an oxidized polyethylene wax emulsion and a polytetrafluoroethylene wax emulsion; a water-soluble fluorine-containing compound D, wherein the weight part of the fluorine element in the solid is 1.5-5 parts; a water-soluble phosphorus-containing compound E, wherein the weight part of the phosphorus element in the solid is 1-3 parts; and a water-soluble salt compound F containing an eighth group iron element, wherein the weight part of the eighth group iron element in the solid component is 0.2-0.6 part.

The invention discloses a flame-retardant polyoxyethylene composite solid electrolyte and a preparation process thereof, and relates to the technical field of solid electrolytes. Comprising the following steps: 1, mixing and stirring modified polyacrylonitrile, polyacrylonitrile and N, N-dimethylformamide, and putting the mixture into an electrostatic spinning machine to obtain a polyacrylonitrile fiber membrane; 2, mixing and stirring the modified beta-cyclodextrin, acetonitrile, polyoxyethylene, lithium perchlorate and succinonitrile to obtain a mixed solution; and 3, putting the polyacrylonitrile fiber membrane into a polytetrafluoroethylene mold, dropwise adding the mixed solution, and drying and demolding at 40 DEG C to obtain the composite solid electrolyte. The composite solid electrolyte has the beneficial effects that beta-cyclodextrin and polyacrylonitrile are modified, so that the compatibility of beta-cyclodextrin and polyacrylonitrile with a polymer matrix is improved, and the ionic conductivity and tensile strength of the composite solid electrolyte are improved. Meanwhile, the grafted spirocyclic phosphate group enables the overall flame retardance of the composite solid electrolyte to be improved to a certain extent.