52 results about "Polyvinyl fluoride" patented technology

An integrated structure pickleball paddle and a preparation process thereof are provided, where the pickleball paddle includes a paddle body, an edge banding, and a handle, where the edge banding and the paddle body are fused into an integrated structure by hot pressing, where the material of the edge banding is a modified TPU composite material, where the modified TPU composite material includes the following raw materials in parts by mass: 90-100 parts of modified TPU, 9-14 parts of polyvinyl fluoride, 20-30 parts of epoxy resin, 10-20 parts of ABS resin, 5-10 parts of modified nano-silicon dioxide, 0.3-0.6 parts of antioxidant, 0.2-0.5 parts of fluidity aid, 4-9 parts of 4,4′-methylene-bis(2-chloroaniline), and 3-7 parts of silicone oil. The edge banding and the paddle body are hot pressed and fused into an integrated structure, the edge banding will not fall off, and the comprehensive performance of the edge banding is better.

The invention belongs to the technical field of composite materials and radomes, and particularly relates to a layer structure of a radome body and a manufacturing method. The skin comprises a first skin layer, an interlayer, a second skin layer and a polyvinyl fluoride film layer which are sequentially arranged from top to bottom. Through collaborative design of a micro-nano composite structure and a low-surface-energy material, a self-cleaning surface skin layer with super-hydrophobicity, high wave transmission and weather resistance is constructed. Compared with a traditional fluorocarbon coating, the wave transmission rate is 60-70% and is improved by more than 25%, the signal transmission loss is remarkably reduced, and the harsh requirement for the wave transmission performance of the antenna housing is met. The cleaning cost of a traditional antenna housing can be saved by more than 80%, especially for high-altitude and complex-structure antenna housings, high-altitude operation or special equipment is not needed, and the maintenance safety risk is reduced. The replacement frequency of the radome caused by aging and abrasion of the coating can be reduced, and the overall life cycle cost of equipment is reduced.

The invention relates to the technical field of radiation refrigeration films, and discloses a porous polyvinylidene fluoride based composite radiation refrigeration film and a preparation method thereof. The method comprises the following steps: firstly, carrying out melt blending on PVDF, NaCl and ZnO nanoparticles and forming a film, then dissolving out NaCl through water washing, and constructing a continuous three-dimensional porous structure in a PVDF matrix; and immersing the obtained porous PVDF / ZnO membrane material into a methanol aqueous solution containing 2-methylimidazole, so that ZnO is subjected to a coordination reaction at the pore wall and is converted into the ZIF-8 nanocrystal in situ. In the thin film prepared by the steps, the micron-sized salt-induced pore structure, the nano-sized ZIF-8 particles and the interface of the ZIF-8 particles jointly form a multi-stage scattering network, so that the scattering ability of the thin film in the solar spectrum range of 0.25-2.5 microns can be remarkably enhanced, the high infrared emission performance of the PVDF matrix in an atmospheric window of 8-13 microns is maintained, and the thin film has high solar reflectivity and high infrared emissivity, and can be used for preparing the solar film. An excellent radiation refrigeration effect can be achieved, and the heat-dissipating material is suitable for being applied to building outer surfaces, equipment heat dissipation, individual heat management and the like.

The application provides a modified polyimide@polyvinyl fluoride double-layer fiber membrane and a preparation method thereof, and belongs to the technical field of fiber membrane preparation; the preparation process comprises the following steps: preparation of NH2-MWCNT; preparation of casting solution and core solution; and preparation of the modified polyimide@polyvinyl fluoride double-layer fiber membrane. The modified polyimide@polyvinyl fluoride double-layer fiber membrane comprises an inner layer and an outer layer; the inner layer is polyvinyl fluoride; the outer layer is NH2-MWCNT modified polyimide; the polyimide is any one of Matrimid5218 and P84; the dry-wet method and the co-extrusion method are adopted; and then heat crosslinking is performed to obtain the NH2-MWCNT modified polyimide@polyvinyl fluoride double-layer fiber membrane.

The utility model relates to the technical field of bubble aluminum heat insulation film blanket production equipment, and discloses a polyvinyl fluoride flame-retardant bubble aluminum heat insulation film blanket production device which comprises a calendering box, an inlet and an outlet are formed in the two ends of the calendering box respectively, and two rows of horizontal lower calendering rollers and upper calendering rollers are rotationally connected into the calendering box. Lower transmission shafts rotationally connected with the calendering box are fixedly installed at the two ends of the lower calendering roller, upper transmission shafts are fixedly installed at the two ends of the upper calendering roller, a driving unit used for driving the lower transmission shafts to rotate at the same time is arranged on one side of the calendering box, and a transmission unit for synchronous transmission is arranged between every two upper transmission shafts and lower transmission shafts. The upper portion of the calendering box is provided with adjusting units used for adjusting the height positions of the multiple upper calendering rollers. According to the utility model, the distance between each lower calendering roller and each upper calendering roller can be adjusted through the adjusting unit, so that the quality of a polyvinyl fluoride film after calendering is improved, and the production quality of a polyvinyl fluoride flame-retardant bubble aluminum heat-insulating film blanket is improved.

The present application relates to a kind of hyperbranched polyvinyl fluoride resin prepared by suspension polymerization with chain transfer agent and its preparation and application, the preparation method of the resin includes: under the condition of using at least one initiator, at least one chain transfer agent, at least one dispersing agent, make polyvinyl fluoride occur polymerization reaction;The chain transfer agent is at least one chain transfer agent of multiple chain transfer sites (≥2) or the combination of liquid phase transfer agent and gas phase transfer agent forms multiple chain transfer sites.Compared with prior art, the polyvinyl fluoride resin of the present application has hyperbranched configuration, and high mechanical strength and good processing performance are considered, the resin is especially suitable for being used as the inner lining material of marine non-adhesive flexible riser, submarine cable packaging layer and other fields, its excellent chemical corrosion resistance, gas permeation resistance and heat aging performance can effectively block the erosion of external corrosive medium to internal tensile armor layer.

The invention discloses a recovery method of a lithium iron phosphate positive electrode material and the lithium iron phosphate positive electrode material, and belongs to the technical field of lithium batteries, the lithium iron phosphate positive electrode material comprises a positive electrode active material, a conductive agent and a binder, the binder is obtained by carrying out free radical graft polymerization reaction on polyvinyl alcohol and unsaturated carboxylic acid and then blending with furfuryl alcohol resin and an aldehyde group cross-linking agent, and the binder is cross-linked in the drying process of the lithium iron phosphate positive electrode material. Grinding the positive active matter, a conductive agent, a binder and water to obtain positive slurry; and carrying out coating, vacuum drying, tabletting, slicing and vacuum drying to obtain the lithium iron phosphate positive electrode material. The binder can improve the performance of a lithium iron phosphate positive electrode material, the solubility of the binder is better than that of polyvinylidene fluoride, an alcohol solvent can permeate into a cross-linked network to destroy a cross-linked part and dissolve the binder, solvents such as strong acid and strong alkali are not needed, the binder is more environment-friendly, and recycled residues do not contain fluorine and aluminum, so that the binder is more environment-friendly. And recycling treatment of the waste batteries is facilitated.

The application discloses a ferroelectric local field enhanced polarized photoelectric detector and a preparation method thereof, and relates to the technical field of polarized photoelectric detection. The polarized photoelectric detector is observed from bottom to top and sequentially comprises a substrate, a two-dimensional semiconductor layer, a metal electrode pair and a ferroelectric film layer. The material of the two-dimensional semiconductor layer is black phosphorus. The material of the ferroelectric film layer is polyvinyl fluoride-based ferroelectric polymer. The metal electrode pair comprises a first metal electrode and a second metal electrode. A channel structure formed between the first metal electrode and the second metal electrode exposes part of the two-dimensional semiconductor layer. An in-plane PN junction is formed by part of the two-dimensional semiconductor layer exposed after the ferroelectric film layer is electrode polarized. The strong local field of the ferroelectric film changes the Seebeck coefficient and the conductivity of the black phosphorus in the armchair direction and the zigzag direction, enhances the photocurrent in the armchair direction, and greatly improves the polarization detection ratio of the polarized photoelectric detector.

The utility model provides a self-repairing radome body structure, which comprises a first skin layer, a first self-repairing layer, a second skin layer, a foam sandwich layer, a third skin layer, a second self-repairing layer, a fourth skin layer and a polyvinyl fluoride film which are sequentially arranged from top to bottom, a curing agent is smeared between the first skin layer and the first self-repairing layer, a curing agent is smeared between the second skin layer and the first self-repairing layer, a curing agent is smeared between the third skin layer and the fourth skin layer and the second self-repairing layer, and the first self-repairing layer and the second self-repairing layer are filled with epoxy resin matched with the curing agents. When the antenna cover body structure is damaged in the environment, the first self-repairing layer and the second self-repairing layer are driven to release epoxy resin due to pressure difference or material damage, so that the epoxy resin is in contact with the curing agent of each skin layer, the epoxy resin and the curing agent are subjected to cross-linking reaction and cured at room temperature, and the damage is repaired in time; and the antenna is ensured to always work in a good environment, so that stable signal transmission quality is maintained.

The utility model relates to a light photovoltaic module, which relates to the photovoltaic field and comprises a transparent top layer, a bonding layer, a glass fiber buffer layer, a bonding layer, a battery layer, a bonding layer and a reinforcing backboard layer which are sequentially arranged. The transparent top layer comprises a polycarbonate layer, a polymethyl methacrylate layer, a fluorinated ethylene propylene copolymer layer or a polyethylene terephthalate layer; the bonding layer comprises an ethylene-vinyl acetate copolymer layer or a polyolefin elastomer layer. And the reinforced back plate layer comprises a polyvinyl fluoride, polyester film and polyvinyl formal back plate layer, a fiber reinforced polyamide back plate layer or a carbon fiber reinforced composite material back plate layer. According to the light photovoltaic assembly provided by the utility model, the light photovoltaic assembly is obtained by simplifying the design of the photovoltaic assembly of the existing sunlight shed and adopting the light high-strength material on the basis of ensuring the strength, so that the breakage rate and the safety coefficient of the product are greatly reduced, and the construction difficulty of the sunlight room is favorably reduced.

The invention belongs to the technical field of compositions of high-molecular compounds, and relates to a high-barrier antibacterial rubber-plastic composite material and a preparation method thereof. The material is composed of 45%-65% of polyvinyl fluoride, 20%-35% of a bio-based polyester elastomer, 1.5%-4.0% of silver-loaded zirconium phosphate, 0.8%-2.5% of a bismaleimide compatibilizer and the balance of a processing aid. Wherein the side chain of the elastomer contains carboxyl or epoxy group, the elastomer and the polyvinyl fluoride form a covalent bond interface through in-situ reaction, and the antibacterial agent is anchored on the interface through silane coupling treatment. The preparation method comprises the steps of pretreatment, primary mixing, reactive extrusion and granulation molding. According to the invention, a bio-based polyester elastomer with reaction activity is introduced through molecular design, and a rubber-plastic composite material system with high barrier property, high toughness, long-acting antibacterial property and good processability is successfully constructed in combination with reactive compatibilization and interface directional anchoring antibacterial strategies; and a reliable material solution is provided for the fields of functional packaging, medical protective films, intelligent flexible devices and the like.

The invention discloses an aramid honeycomb core glass fiber reinforced interlayer cargo hold lining plate and a manufacturing method, the cargo hold lining plate comprises an upper skin layer, a glue film layer, an aramid honeycomb core layer, a glue film layer and a lower skin layer which are laminated in sequence, and the upper skin layer and the lower skin layer are each composed of two layers of satin fabric phenolic aldehyde glass fiber prepreg and an outer polyvinyl fluoride film; the prepreg paving angles of the upper and lower skin layers are perpendicular to each other and are parallel or perpendicular to the directions of the honeycomb core strip grooves; all the layers are integrally formed through co-curing. By optimizing the laying angle design and adopting the polyvinyl fluoride film to replace a traditional TADLAR film, an adaptive adhesive film and prepreg, the problems that an existing lining plate is poor in mechanical balance, not firm in interface bonding and prone to failure of a surface layer are solved, and the composite lining plate has excellent mechanical property, flame-retardant safety and environment-resistant stability and is suitable for the field of aviation.

A polyfluoroethylene / fluorinated graphene composite material and a forming method thereof, wherein the forming method of the polyfluoroethylene / fluorinated graphene composite material comprises: uniformly mixing fluorinated graphene powder and polytetrafluoroethylene powder to obtain polytetrafluoroethylene / fluorinated graphene composite powder; pressing the obtained polytetrafluoroethylene / fluorinated graphene composite powder through a flat die without limitation in four directions to obtain a preformed composite material; and further pressing the obtained preformed composite material in a closed die to obtain a polyfluoroethylene / fluorinated graphene composite material with ultra-low dielectric constant and ultra-low dielectric loss at a high working frequency (GHz). The polyfluoroethylene / fluorinated graphene composite material with ultra-low dielectric constant and ultra-low dielectric loss has excellent mechanical properties; and the addition of a small amount of fluorinated graphene not only effectively reduces the dielectric loss of polytetrafluoroethylene, but also effectively improves the mechanical properties of polytetrafluoroethylene.

The invention relates to the technical field of shoe sole molds, in particular to a TPU outsole processing and forming mold and a forming method thereof.The forming mold comprises an upper mold and a lower mold, the upper mold comprises a plurality of pressing mold blocks, and a plurality of mold cavities connected with the corresponding pressing mold blocks in a clamped mode are formed in the upper end face of the lower mold; a polyvinyl fluoride layer and a sand blasting layer are sequentially arranged on the groove wall of the mold cavity from outside to inside, each pressing module comprises a mounting base, the lower end face of each mounting base extends downwards to form a pressing block, the radial distance of each pressing block is smaller than that of each mounting base, and a containing groove is defined by the lower end face of each mounting base and the side face of each pressing block.

The application discloses a kind of high-temperature-resistant flame-retardant fluororubber composite material for switchgear and a preparation method thereof, and relates to the technical field of fluororubber.The application uses gamma ray co-irradiation method to graft polyvinyl fluoride with diethyl allyl phosphate, and reacts with high methyl vinyl silicone rubber under the action of triallyl phosphate to form a dense three-dimensional hybrid network, increase the phonon scattering resistance to reduce the heat conduction efficiency, and the phosphorus component and the silicon rubber combustion product synergistically form a gas-solid dual flame-retardant barrier.The application grafts talc powder with vinyltriethoxysilane and modifies it by radiation and polymerization with diethyl vinylphosphonate to obtain a lamellar filler, delays heat transfer, and induces the directional formation of carbon layer to form a "lamellar-glass-carbon" composite barrier layer.The surface modification increases the specific surface area, improves the efficiency of free radical capture, and the hybrid crosslinking point formed by graft copolymerization and the matrix network form a double phonon scattering barrier.The high-temperature-resistant flame-retardant fluororubber composite material for switchgear prepared by the application has the effects of high-temperature resistance and flame retardance.

The application discloses a recycling method of lithium iron phosphate positive electrode material and the lithium iron phosphate positive electrode material, and belongs to the technical field of lithium batteries. The lithium iron phosphate positive electrode material comprises a positive electrode active material, a conductive agent and a binder. The binder is obtained by blending a furfuryl alcohol resin and an aldehyde-based crosslinking agent after a free radical graft polymerization reaction of polyvinyl alcohol and an unsaturated carboxylic acid. The binder is crosslinked during the drying process of the lithium iron phosphate positive electrode material. The positive electrode active material, the conductive agent and the binder are ground with water to obtain a positive electrode slurry. The lithium iron phosphate positive electrode material is obtained through coating, vacuum drying, tabletting, slicing and vacuum drying. The binder can improve the performance of the lithium iron phosphate positive electrode material. The binder has better solubility than polyvinylidene fluoride. Alcohol solvents can penetrate into the crosslinked network, destroy the crosslinked part, dissolve the binder, and do not need to use strong acid and strong alkali solvents, thereby being more environmentally friendly. The recycling residue does not contain fluorine elements and aluminum, and is beneficial to the recycling and treatment of waste batteries.

A process for forming a lithium dispersion comprising the steps of: a) contacting lithium metal with a hydrocarbon oil; b) heating the lithium metal and the hydrocarbon oil to a temperature higher than the melting point of the lithium metal; c) subjecting the heated lithium metal and the hydrocarbon oil to conditions sufficient to disperse the lithium metal in the oil, wherein subjecting means vigorously agitating or stirring and contacting the lithium metal powder with a polymer at a temperature between that temperature and at or above the melting point of the lithium; and d) contacting the lithium metal with a polymer selected from the group consisting of polyurethanes, polytetrafluoroethylene, polyvinyl fluoride, polyvinyl chloride, polystyrenes, polypropylenes, polyformaldehyde, styrene-butadiene-styrene block polymers, ethylene-vinyl acetate, ethylene-acrylic acid copolymers, polyethylene oxide, polyimides, polythiophenes, poly(para-phenylene), polyaniline, poly(p-phenylenevinylene), copolymers based on silicon dioxide, titanium dioxide, unsaturated polycarboxylic acids and polysiloxanes at a temperature between the melting point of the lithium metal and the melting point of the polymer to provide a continuous layer of polymer on the lithium metal.

The utility model is suitable for the technical field of solar energy, and provides an environment-friendly photovoltaic module, which comprises a front plate, a front adhesive film, a battery piece, a back adhesive film and a fluoride-free back plate, the front plate is prepared from polyvinyl fluoride and a thermoplastic or thermosetting material; and the middle layer of the fluoride-free back plate is a glass fiber base material containing polypropylene. The PVF does not belong to perfluoroalkyl and polyperfluoroalkyl substances, so that the front plate and the fluorine-free back plate can meet the environmental protection requirement, and the fluorine-free back plate adopts a polypropylene-containing glass fiber base material as the material of the middle layer, so that the bearing capacity of the photovoltaic module is improved.

The invention provides a high-strength high-wear-resistance polyester composite fiber, and relates to the field of chemical fibers. The skin layer coats the outer side of the core layer; the core layer is prepared from polyester; the skin layer is prepared from modified polyvinyl fluoride; the modified polyvinyl fluoride is prepared by soaking a polyvinyl fluoride polymer in a modification solution and modifying the polyvinyl fluoride polymer through ultraviolet radiation; the modified solution is prepared from a benzophenone compound, a disulfide compound, an acrylate substance and dioxane; the molar ratio of the benzophenone compound to the disulfide compound to the acrylate substance is 1: 1: (100-400). The high-strength high-wear-resistance polyester composite fiber provided by the invention solves the problem that wear-resistant polyester fibers in the prior art cannot have good wear resistance, stability and environmental friendliness at the same time; the wear-resistant polyester fiber provided by the invention has the advantages of high performance, good use experience and environmental protection.

The invention discloses a carbon nanotube coating aging protection process, and belongs to the technical field of material protection. Comprising the following four core steps: gradient interface modification pretreatment, preparation of a double-structure inorganic protective layer, construction of a temperature-sensitive organic protective layer and interface synergistic reinforcement post-treatment. An interface reinforcement transition layer is constructed through argon, oxygen and carbon tetrafluoride mixed gas plasma treatment and aminated carbon quantum dot synergistic modification; the preparation method comprises the following steps: preparing a double-structure inorganic protective layer by combining magnetron sputtering and sol coating, constructing a temperature-sensitive organic protective layer by using a polyvinyl fluoride-acrylate copolymer containing a phase change microcapsule and a compound anti-ultraviolet agent, and finally promoting an inorganic-organic interface to form a Si-O-C covalent bond through ultraviolet-heat synergistic treatment. Through multi-step collaborative design, the problems that in a traditional technology, a carbon nano tube coating is single in protection function and rapid in aging failure are solved, the aging speed is reduced after treatment, and the heat conduction and spectral absorption core performance of the carbon nano tube is stably reserved.

The application discloses a kind of super double-soluble radiation refrigeration material preparation method, the method includes the following steps: polyvinyl fluoride-hexafluoropropylene is dissolved in acetone after adding alumina dispersion liquid to obtain radiation refrigeration material base fluid;Isopropanol, water, silicon dioxide are mixed to prepare A liquid, tetraethyl orthosilicate, hydrochloric acid, ethanol are mixed to prepare B liquid, after A liquid and B liquid are mixed, super double-soluble spraying liquid is prepared;Radiation refrigeration material base fluid is obtained by using blade coating method to obtain radiation refrigeration base material, and super double-soluble spraying liquid is sprayed onto radiation refrigeration base material by spraying method to obtain super double-soluble radiation refrigeration material.The super double-soluble radiation refrigeration material prepared by the application has 99% reflectivity in the solar wave band, 97% emissivity in the atmospheric window, can cause 5℃ sub-environmental temperature drop under hot weather (≈35℃), has high reflectivity and high emissivity at the same time, has excellent self-cleaning liquid-repellent performance, so that it has good weather resistance in complex environment.

The application provides a multilayer flexible composite functional film and a preparation method thereof, which comprises a film layer 1 and a film layer 2, the film layer 1 comprises an outer film layer and an emission layer, the film layer 2 comprises a reflection layer and an inner film layer, and the structure is sequentially stacked from top to bottom as the outer film layer, the emission layer, the reflection layer and the inner film layer. The material of the inner film layer and the outer film layer is any one of transparent polyvinyl fluoride (PVF), polyvinylidene fluoride (PVDF) or polyvinyl chloride (PVC) or a combination thereof, the material of the emission layer is bead-shaped carbon black particles, the infrared emissivity of the outer surface of the functional film is improved, and then the heat is prevented from gathering on the outer surface, so that the outer surface of the functional film is efficiently radiated. The material of the reflection layer is sheet-shaped aluminum, the reflection layer can realize efficient reflection of sunlight, the heat is prevented from being absorbed on the outer surface of the multilayer flexible material in a large amount, and the effect of rapid heat dissipation is achieved.

The utility model discloses a lining oil pipe, which relates to the technical field of pipeline transportation of petroleum, natural gas and the like, and comprises an oil pipe outer pipe, external threads are arranged on the outer side of the oil pipe outer pipe at equal intervals, a lining pipe main body is arranged inside the oil pipe outer pipe, and an adhesive is arranged between the inside of the oil pipe outer pipe and the outer side of the lining pipe main body. A protective layer is arranged on the outer side of the oil pipe outer pipe. According to the lining oil pipe disclosed by the utility model, the outer pipe of the oil pipe is made of a low-alloy high-strength steel material, so that the oil pipe has excellent mechanical strength and toughness and can stably operate under high-temperature and high-pressure conditions. The lining pipe body is jointly composed of the polyvinyl fluoride layer and the glass fiber reinforced polyester layer, polyvinyl fluoride has excellent chemical corrosion resistance, damage of a conveying medium to the pipeline is effectively prevented, and therefore the service life of the pipeline is remarkably prolonged. The outer protective layer of the oil pipe outer pipe is composed of a polyethylene coating and a polypropylene coating, and the coatings provide additional protection for the pipeline and enhance the wear resistance and impact resistance.

The invention relates to the technical field of composite coatings, in particular to an impact-resistant energy-absorbing and long-acting corrosion-resistant integrated composite coating for a marine steel structure, which sequentially comprises a substrate treatment layer, an energy-absorbing elastic layer, an intelligent corrosion-resistant layer and a wear-resistant anti-fouling surface layer from inside to outside from the surface of a base material, the substrate treatment layer contains modified epoxy zinc-rich resin and other components, the energy-absorbing elastic layer comprises a composite elastomer, a modified ACF artificial cartilage material and the like, the intelligent anti-corrosion layer contains modified epoxy resin, response type microcapsules and the like, and the wear-resistant anti-fouling surface layer contains modified polyvinyl fluoride resin and other related components. According to the composite coating, impact resistance, energy absorption and long-acting corrosion prevention are integrated, interlayer combination is firm, the intelligent corrosion prevention response and early warning functions are achieved, the anti-aging, wear-resisting and anti-pollution performance is excellent, and the service life of a maritime work steel structure is greatly prolonged.

The invention provides a high-strength wear-resistant modified polyester fiber and a preparation method thereof, and relates to the field of chemical fibers. The middle layer coats the outer side of the core layer; the skin layer covers the outer side of the middle layer; the core layer is prepared from polyester; the middle layer is prepared from modified polyvinyl fluoride; the skin layer is prepared from polyvinyl fluoride; the modified polyvinyl fluoride is prepared by soaking a polyvinyl fluoride polymer in a modification solution; the modified solution is prepared from a benzophenone compound, a disulfide compound, an acrylate substance and dioxane; wherein the molar ratio of the benzophenone compound to the disulfide compound to the acrylate substance is 1: 1: (100-400). The wear-resistant polyester fiber can solve the problem that the wear-resistant polyester fiber in the prior art cannot have good wear resistance, stability and environmental friendliness at the same time; the wear-resistant polyester fiber provided by the invention has high performance and good use experience and is environment-friendly.

The invention relates to the technical field of modified polyvinyl fluoride, and discloses a high-temperature-resistant creep-resistant modified polyvinyl fluoride material, which is prepared from the following raw materials in parts by mass: 100 to 120 parts of polyvinyl fluoride, 15 to 20 parts of reinforcing filler, 2 to 5 parts of heat stabilizer, 3 to 5 parts of antioxidant, 1 to 2 parts of coupling agent and 1 to 2 parts of compatilizer. The distance between polyvinyl fluoride molecular chains can be increased through the reinforcing filler, so that the polyvinyl fluoride molecular chains are entangled through the reinforcing filler, mutual slippage between rubber molecular chains is inhibited, and the creep resistance of the polyvinyl fluoride material is improved; the high temperature resistance and creep resistance of the modified polyvinyl fluoride material can be improved.

Provided is a method of manufacturing a brush, such as a wafer cleaning brush. The method includes providing a polyvinyl alcohol (PVA) solution, forming an insoluble polyvinyl fluoride (PVF) by adding formaldehyde to the PVA solution, adding a water-soluble inorganic compound including a plurality of particles to the insoluble PVF, and mixing the insoluble PVF with the water-soluble inorganic compound to form a mixture of the water-soluble inorganic compound and the insoluble PVF, forming a brush by inserting the mixture of the water-soluble inorganic compound and the insoluble PVF into a mold and heat-treating the mixture, removing the wafer cleaning brush from the mold; and washing the wafer cleaning brush to remove the plurality of particles of the water-soluble inorganic compound from the wafer cleaning brush.

This invention discloses a wear-resistant and corrosion-resistant photovoltaic bracket and its preparation method. The bracket includes a modular high-strength support frame and a double-layer composite wear-resistant and corrosion-resistant coating. The frame is integrally molded from a three-reinforcing phase synergistic gradient-reinforced aluminum-based composite material consisting of micron-sized silicon carbide, nano-sized titanium boride, and graphene nanosheets. The reinforcing phases are gradient-distributed from the surface to the core, and the graphene nanosheets are modified with ethyl cellulose. The bottom layer of the coating is a cerium-zinc-aluminum-magnesium alloy plating, and the top layer is a polyvinyl fluoride coating containing nano-alumina-silicon nitride composite particles. The preparation method includes raw material pretreatment, gradient composite molding, heat treatment strengthening, frame processing, coating preparation, and assembly steps. This invention breaks through the performance bottlenecks of traditional materials, achieving a synergistic effect of ultra-high strength and high toughness, self-lubrication, and fatigue wear resistance. It exhibits excellent wear and corrosion resistance, significant lightweighting of the bracket, environmentally friendly and low-energy-consumption manufacturing process, convenient transportation and installation, low total life-cycle cost, and long service life.

The invention relates to the technical field of polyvinylidene fluoride materials, in particular to a polyvinylidene fluoride offshore photovoltaic cable material. The polyvinylidene fluoride offshore photovoltaic cable material is prepared from the following raw materials in parts by mass: 40 to 70 parts of polyvinylidene fluoride, 20 to 50 parts of polyvinyl chloride, 5 to 15 parts of ethylene-trifluorochlor oethylene copolymer, 1 to 3 parts of perfluoroethyl vinyl ether, 0.1 to 1 part of dicumyl peroxide, 0.1 to 1 part of nano zinc oxide, 1 to 3 parts of calcium-zinc stabilizer, 10 to 30 parts of filler, 1 to 2 parts of lubricant and 0.5 to 1.5 parts of stearic acid. 1-2 parts of a plasticizer and 1-2 parts of a compatilizer. The requirement for long-term stable operation of an offshore photovoltaic cable in high-salt, high-humidity, high-temperature and strong-ultraviolet environments is effectively met, the requirement for long-term stable operation under severe offshore conditions is fully met, and meanwhile the preparation method is simple and suitable for large-scale application and popularization.

This invention provides a photothermal conversion phase change insulation flexible composite pipe and its preparation method, comprising a base pipe layer and, from the inside out, an adhesive transition layer, a phase change insulation layer, a photothermal conversion layer, and a protective layer. The base pipe layer consists of an inner lining layer, a double-layer fiber reinforcement layer, and an outer protective layer. The adhesive transition layer is a mixture of ethylene-vinyl acetate copolymer and silane coupling agent. The phase change insulation layer uses modified melamine foam as a skeleton, loaded with erythritol phase change material and nano-silica. The photothermal conversion layer is a composite layer of polydopamine and waterborne polyurethane. The protective layer is a polyvinyl fluoride layer. The preparation method includes extrusion winding of the base pipe layer, thermal spraying of the adhesive transition layer, vacuum impregnation and hot pressing of the phase change insulation layer, spraying and drying of the photothermal conversion layer, and extrusion cooling and shaping of the protective layer. This invention achieves a combination of photothermal conversion energy storage and flexible insulation, with strong layer bonding, good flexibility, high mechanical strength, low heat loss, energy saving and environmental protection, and is suitable for various scenarios such as centralized heating and industrial steam transportation.