177 results about "Polyurethane membrane" patented technology

The invention discloses a polyurethane protective adhesive tape for aviation and a preparation method thereof, and relates to the technical field of adhesives. When the polyurethane protective adhesive tape for aviation is prepared, polyester glycol, an ultraviolet absorption monomer, 3-(4-pyridyl) pentane-1, 5-diol, 1, 4-butanediol and isophorone diisocyanate are polymerized to prepare polyurethane; the preparation method comprises the following steps: carrying out a reaction on polyurethane and 2-bromoethyl acrylate to prepare modified polyurethane; enabling the pretreated magnesium hydroxide to react with 3-epoxypropoxy-1, 1, 3, 3-tetramethyldisiloxane and ammonia water in sequence, so as to obtain modified magnesium hydroxide; the modified polyurethane and the modified magnesium hydroxide are mixed and then subjected to compression molding to prepare a polyurethane film; and coating a polyurethane film with the polyacrylate glue solution, and drying to obtain the polyurethane protective adhesive tape for aviation. The polyurethane protective adhesive tape for aviation prepared by the invention has excellent flame-retardant, anti-aging, antibacterial and self-repairing properties.

The invention provides hydrogel wound dressing and a preparation method thereof.The hydrogel wound dressing comprises a hydrogel layer, a supporting layer and a protective layer, the hydrogel layer is prepared from, by mass, 10%-15% of polyvinylpyrrolidone, 5%-8% of polycaprolactone, 2%-4% of sodium carboxymethyl cellulose, 1%-3% of chitosan, 0.5%-1.5% of an antibacterial agent, 0.1%-0.3% of an antioxidant and the balance water; the invention discloses a graphene quantum dot gel which comprises the following components in percentage by weight: 0.01-0.1% of a growth factor, 0.1-0.5% of a temperature-sensitive polymer, 0.05-0.15% of graphene quantum dots, 0.5-1.5% of a self-healing polymer, 0.5-1.5% of a pH sensitive material, 0.1-0.3% of nano titanium dioxide and the balance of deionized water. The supporting layer is a porous polylactic acid film, and the thickness of the supporting layer is 0.1-0.3 mm; the protective layer is an air-permeable polyurethane film, and the thickness of the protective layer is 0.2-0.4 mm. Through the synergistic effect of an antibacterial agent, nano titanium dioxide and graphene quantum dots, the antibacterial performance of the dressing is remarkably improved.

The invention relates to the field of polyurethane film materials for batteries, and discloses a TPU composite material for a new energy battery and a preparation method of the TPU composite material. A TPU composite material for a new energy battery is composed of a cloth film layer, an adhesive film layer and a TPU film layer, the TPU film layer is prepared by melting and casting TPU hot melt adhesive, and the TPU hot melt adhesive is prepared from the following raw materials in parts by weight: 60-80 parts of polyurethane elastomer, 20-30 parts of a toughening aid, 15-25 parts of a flame retardant, 8-15 parts of a heat conducting agent, 2-4 parts of a lubricant and 1-3 parts of an antioxidant; the toughening auxiliary agent is prepared from a POE (Polyolefin Elastomer), long carbon chain alkyl glycidyl ether, dibutyl itaconate and a vinyl dimethyl terminated dimethyl-methyl trifluoropropyl polysiloxane copolymer. The TPU composite material disclosed by the invention is applied to a new energy battery, has relatively good buffering and damping effects and puncture resistance, and is good in flame retardance and thermal conductivity.

The invention discloses a super-hydrophobic self-repairing polyurethane film for photovoltaics and a preparation method of the super-hydrophobic self-repairing polyurethane film. The super-hydrophobic self-repairing polyurethane film is prepared from the following components in parts by weight: polyether polyol, isocyanate, a catalyst, a solvent, a self-repairing auxiliary agent, a chain extender and super-hydrophobic nanoparticles, the super-hydrophobic nano particles are fluorine-silicon polymer nano particles which are modified hydrophobic nano particles obtained by hydrolyzing two or more organic silicon and then introducing a C-F bond through copolycondensation to realize fluorination modification; the service life of the composite material is prolonged, the durability of the composite material is improved, and the material can be self-healed after being damaged by the outside; on the basis of self-repairing, hydrophobic nanoparticles are added to realize a super-hydrophobic surface; the transparent polyurethane film material for the photovoltaic power generation panel can be adhered through electrostatic adsorption or other adhesives, so that the film material is loaded on the photovoltaic panel, the photovoltaic panel is protected, and the photovoltaic panel is prevented from being damaged due to external environment pollution.

The invention belongs to the field of intelligent wearing, and discloses a multifunctional wearable composite fiber membrane and a preparation method and application thereof. The multifunctional wearable composite fiber membrane is of a sandwich structure, the upper layer is a fullerene hybridized phosphorene modified polyacrylonitrile membrane, the lower layer is a polyurethane membrane, and the middle layer is a silver nanowire layer. The preparation method comprises the following steps: firstly, preparing fullerene hybridized phosphorene nanosheets, dispersing the fullerene hybridized phosphorene nanosheets into a solvent to obtain fullerene hybridized phosphorene dispersion liquid, adding the fullerene hybridized phosphorene dispersion liquid into a polyacrylonitrile solution, stirring to obtain a fullerene hybridized phosphorene / polyacrylonitrile spinning solution, and carrying out electrostatic spinning to obtain the fullerene hybridized phosphorene modified polyacrylonitrile fiber membrane. And then rolling or spraying a silver nanowire layer, covering one side of the silver nanowire layer with a polyurethane fiber membrane, drying and pressing to obtain the composite material. The composite fiber membrane prepared by the invention has good mechanical properties, air permeability, one-way moisture conduction performance, antibacterial performance, heat dissipation performance, electromagnetic shielding performance and flame retardant performance, and has a wide application prospect in the field of flexible wearable intelligent equipment.

The invention belongs to the technical field of waterborne polyurethane, and discloses photo-thermal antibacterial, self-enhanced and self-healing vegetable oil-based waterborne polyurethane. The high-temperature-resistant polyurethane elastomer is prepared from a system consisting of the following raw materials in parts by weight: 80 to 120 parts of castor oil, 60 to 80 parts of dicyclohexylmethane diisocyanate, 20 to 40 parts of hexamethylene diisocyanate, 20 to 40 parts of N-methyldiethanolamine, 20 to 50 parts of protocatechuic acid, 2 to 10 parts of metal ions, 2000 to 3000 parts of water and 0.5 to 1 part of a catalyst. Metal ions in the photo-thermal antibacterial, self-enhanced and self-healing plant oil-based waterborne polyurethane and phenolic hydroxyl groups in protocatechuic acid are coordinated and self-assembled to form metal nanoclusters, and the waterborne polyurethane material has self-enhanced and self-healing properties due to a low-bond-energy coordination aggregation state structure; meanwhile, the waterborne polyurethane film is endowed with photo-thermal antibacterial performance by the metal nanoclusters. The invention further discloses a preparation method and application of the photo-thermal antibacterial, self-enhanced and self-healing plant oil-based waterborne polyurethane.

The invention relates to the field of agricultural new materials, and provides a production-increasing functional full-biodegradable controlled-release fertilizer and a preparation method thereof.The production-increasing functional full-biodegradable controlled-release fertilizer is prepared by loading a functional substance onto a carrier to obtain a carrier-functional substance slow-release complex with a slow-release function, then blending and dissolving the carrier-functional substance slow-release complex with full-biodegradable resin and a solvent to obtain a coating solution, and then adding the coating solution into the full-biodegradable controlled-release fertilizer to obtain a finished product. Coating liquid is sprayed to the surfaces of fertilizer particles, the fertilizer particles are coated, and the yield-increasing functional full-biodegradable resin coated controlled-release fertilizer is prepared and can enable yield-increasing functional substances and fertilizer nutrients to be released synchronously, and the nutrient utilization rate is increased to the maximum extent. The final degradation products of the fully-biodegradable resin film material in soil are carbon dioxide and water, and the fully-biodegradable resin film material is green, environment-friendly and pollution-free, can replace traditional non-degradable polyethylene and polyurethane film materials, meets the requirements of green and sustainable development of agriculture in China, and has important economic, social and ecological benefits.

The application discloses a kind of high waterproof moisture-permeable polyurethane film materials and high waterproof moisture-permeable fabric, it is related to polyurethane film material technical field, high waterproof moisture-permeable polyurethane film material, including following raw materials: polyether diol, diisocyanate, organic solvent, modified porous biochar, modified diatomite, chain extender, thickening agent, defoaming agent, ultraviolet absorber, dibutyltin dilaurate;The modified porous biochar is prepared by activating corn straw powder by potassium phosphate and potassium hydroxide in cooperation, and polyethylene glycol is added as a dispersant, and the modified porous biochar is treated by mercapto and fluorination modification;By introducing potassium phosphate in cooperation with potassium hydroxide to form an activation system in the preparation of modified porous biochar in polyurethane film material, combined with polyethylene glycol, dispersion optimization and reduction synergy are realized, and the moisture permeability, waterproofness, mechanical properties and durability of the material are improved.

The invention relates to the technical field of self-repairing high polymer materials, and discloses self-healing tannic acid-based polyurethane as well as a preparation method and application thereof, tannic acid is taken as a cross-linking agent, castor oil is taken as polyol of polyurethane, isophorone diisocyanate is taken as polyisocyanate of polyurethane, bis (2-ethoxyl) disulfide and 1, 3-butanediol are taken as a crosslinking agent, and the self-healing tannic acid-based polyurethane is prepared by a one-step method. The preparation method comprises the following steps: by taking 1, 4-butanediol as a chain extender of polyurethane, preparing tannic acid-based polyurethane on the basis of a prepolymer method; the self-healing temperature of the tannic acid-based polyurethane film prepared from the tannic acid-based polyurethane is 80 DEG C, and the self-repairing efficiency is as high as 95%.

The invention discloses a preparation method of a high-temperature-resistant and high-wear-resistant bio-based waterproof moisture-permeable membrane for shoes, which comprises the following steps: step 1, preparing a high-temperature-resistant and high-wear-resistant bio-based polyurethane membrane casting solution, namely mixing bio-based polyurethane resin, wear-resistant high-specific-heat particles, a pore-foaming agent, a modifier, a coupling agent and an auxiliary agent, and uniformly stirring to obtain the high-temperature-resistant and high-wear-resistant bio-based polyurethane membrane casting solution; a uniform membrane casting solution is formed; 2, film coating is conducted through a template method, specifically, the high-temperature-resistant nanofiber skeleton is fixed to a base material, the fixed nanofiber skeleton is filled with the film casting solution, and pre-crosslinking treatment is conducted on the film casting solution through ultraviolet light irradiation; 3, gradient coagulating bath synergistic phase separation pore forming is carried out, specifically, the film layer subjected to ultraviolet light irradiation treatment is sequentially immersed into at least two coagulating baths, the first coagulating bath is used for activating covalent bond reaction of active groups on the surface of the film layer and inhibiting the phase separation rate, and the second coagulating bath is used for activating covalent bond reaction of the active groups on the surface of the film layer; the second coagulating bath is used for quickly desolvating, inducing phase separation and forming a through microporous structure; and 4, carrying out post-curing treatment on the film layer to lock the through micropore structure and complete residual crosslinking. By adopting the technical scheme, the high temperature resistance and wear resistance of the bio-based waterproof moisture-permeable film can be improved.

The application relates to a fire resistant composite containing a first textile, a first adhesive layer, a polyurethane membrane, a second adhesive layer, and a nonwoven textile. The first textile contains at least about 40% by weight inherently flame resistant fibers. The polyurethane membrane has a softening temperature of least about 210° C. according to ASTM E2347 test method and is non-melting according to ASTM F2894 test method. The first adhesive layer is located between the polyurethane membrane and the first textile and contains a phosphor-based flame retardant. The nonwoven textile is a spunlace nonwoven textile and contains a plurality of staple fibers being at least about 40% by weight inherently flame resistant fibers. The second adhesive layer contains a discontinuous coating of a hot melt adhesive in a pattern of discrete elements.

The invention discloses a medical bio-based high-toughness waterproof breathable polyurethane film and a preparation method thereof. The film sequentially comprises a compact bottom layer, a reinforced breathable middle layer and a compact upper layer, the enhanced breathable middle layer is a melt-blown superfine fiber non-woven fabric; the compact upper layer and the compact bottom layer are antibacterial modified bio-based polyurethane film layers. The preparation method comprises the following steps: preparing antibacterial bio-based polyurethane slurry; coating a bottom layer; laying a middle layer; coating and compounding an upper layer; drying and hot-pressing shaping; and post-processing. The hydrostatic pressure resistance of the obtained film is gt; the HO is 75 cm, and the water vapor permeability is gt; the tensile strength gt is 4000 g / m.24 h; the tearing strength is gt; the antibacterial rate gt is 600 mN; the medical film integrates breathability, toughness and waterproofness, is excellent in comprehensive performance, and can meet the use requirements of the medical film.

The invention relates to the technical field of polyurethane, and discloses an elastic waterproof biomimetic membrane as well as a preparation method and application thereof. Polylactic acid dihydric alcohol, an isocyanate monomer, a chain extender and cardanol siloxane-based cellulose are subjected to a polymerization chain extension reaction, and the elastic waterproof biomimetic membrane is obtained. The nano cellulose containing a benzene ring structure, a cardanol flexible long carbon chain and a siloxane structure are introduced into polyurethane, so that the tensile strength and the elongation at break of a polyurethane film are improved. Meanwhile, the hydrophilicity of cellulose is reduced, the water contact angle of the polyurethane film is increased, the waterproof performance is enhanced, and the good practical application is achieved in the waterproof finishing aspect of fabric such as bionic waterproof and moisture permeable films and outdoor jackets.

The invention discloses a highly waterproof and moisture permeable polyurethane film material and a highly waterproof and moisture permeable fabric, and relates to the technical field of polyurethane film materials. Comprising the following raw materials: polyether glycol, diisocyanate, an organic solvent, modified porous charcoal, modified diatomite, a chain extender, a thickening agent, a defoaming agent, an ultraviolet absorbent and dibutyltin dilaurate. The modified porous biochar is prepared by synergistically activating corn straw powder through potassium phosphate and potassium hydroxide, polyethylene glycol is added as a dispersing agent, and the modified porous biochar is subjected to sulfhydrylation and fluorination modification treatment; potassium phosphate is introduced in preparation of modified porous biochar of a polyurethane film material to cooperate with potassium hydroxide to form an activation system, and polyethylene glycol is combined to realize dispersion optimization and reduction cooperation, so that moisture permeability, water resistance, mechanical properties and durability of the material are improved.

The invention discloses a preparation method of a mechanochromic photonic crystal composite film as well as a product and application of the mechanochromic photonic crystal composite film. The TPU / CLCE composite film is prepared by compounding a mechanically force-induced color-changing cholesteric liquid crystal elastomer (CLCE) film onto a black polyurethane (TPU) film purchased on the market through a water transfer printing technology. The composite film prepared by a water transfer printing method has good tensile property, the shape and the color can be completely recovered, and the composite film has strong metal reflection color. The composite film meets the basic performance requirements of the color-changing car cover, can be further expanded to be applied to the fields of intelligent wearable equipment, consumer electronics and the like, and provides unique visual effects and functional characteristics for products. Good market application prospects are realized.

The invention relates to the technical field of research and development of waterproof and breathable films, and discloses a waterproof and breathable composite fabric and a preparation process thereof.The product structure of the fabric is as follows: polyester high-elastic twill fabric is used as a fabric, hot melt mesh glue is used as a middle layer, and a polyurethane waterproof and breathable film is used as a lining. The fabric, the middle layer and the lining are laminated and compounded on a pressing machine, and the waterproof and breathable composite fabric is prepared; the polyurethane waterproof moisture-permeable film comprises an isocyanate prepolymerization component and a polyol component, a hydroxyl-terminated alkyl long-chain linear or cage-containing siloxane monomer is chemically introduced into an isocyanate prepolymerization component, and a solvent-free double-component reaction coating curing process is adopted to prepare the polyurethane film with excellent waterproof performance. The water resistance of the prepared polyurethane film product can meet the commercial use requirement.

The invention relates to the field of complex bone defect treatment, and discloses a nano material with an efficient antibacterial effect and a preparation method thereof.The preparation method comprises the steps that ammonium bismuth citrate and luteolin are mixed and dissolved in formamide, the mixture is put into a reaction kettle to react, a reaction solution is obtained, and Bi-Lu CDs in formamide is obtained after centrifugation and filtration; mixing the MSN-coated Bi-Lu CDs with amino-modified mesoporous silica microspheres, centrifuging, dispersing in deionized water, and drying in vacuum to obtain pure MSN-coated Bi-Lu CDs powder; the preparation method comprises the following steps: preparing a polyurethane dispersion liquid from polyurethane, spraying the polyurethane dispersion liquid on a quartz plate to form a polyurethane film, and spraying MSN and Bi-Lu CDs powder on the polyurethane film to carry out metal spraying treatment; a second precipitate is obtained; drying in vacuum to obtain J-Bi-LuCDs M (at) Au powder; the problems that in the prior art, due to the fact that a pure carbon dot material lacks active diffusion power, the treatment effect on complex tissue defects and bacterial biofilms is still limited, and a precursor material is poor in biocompatibility, not prone to dissolution and low in bioavailability are solved.

The utility model provides high-permeability polyurethane film composite fabric processing equipment which comprises a bottom plate, a shell is fixedly connected to the middle of the upper surface of the bottom plate, a collecting box is slidably connected to the bottom of the shell, a screening net is fixedly connected to the inner side walls of the collecting box, and the tops of the two inner side walls of the shell are designed to be beveled. A separation box is fixedly connected to the middle of the inner side wall of one side of the shell, mounting frames are fixedly connected to the two sides of the upper surface of the bottom plate, clamping grooves are formed in the edges of one sides of the mounting frames, and arc-shaped grooves are formed in the surfaces of the two sides of the mounting frames. Through the arrangement of the extrusion roller, a worker can control the press-fit cloth arranged above and below the composite fabric to perform press-fit operation through the extrusion roller, so that the extrusion roller is effectively prevented from being adhered to the composite fabric, and the problems that in the prior art, in the using process, most of the cloth is directly extruded and adhered, so that polyurethane adhesion is extremely prone to causing cloth edge yarn running, and the production efficiency is high are solved. The normal use of the cloth is influenced.

The invention provides a composite polyurethane film capable of preventing fouling and adsorbing bivalent copper ions in seawater and a preparation method and application thereof.The method comprises the steps that firstly, polyurethane is prepared through a high-molecular organic polymerization reaction, and a tannic acid / collagen compound is used for modifying the polyurethane; the adsorption performance of the original polyurethane is improved, and meanwhile, the antifouling function is given to the polyurethane. Besides, tannic acid is poor in stability in water and easy to dissolve in water, however, tannic acid and collagen are co-precipitated in water, and then the precipitate is grafted to polyurethane, so that the problem of water stability of tannic acid is solved, and meanwhile, because collagen is rich in amino groups, adsorption of bivalent copper ions can be further improved. The preparation method has the advantages that the operation is simple and convenient, the production efficiency is high, the raw materials are easy to obtain and the like, a feasible technical route is provided for industrial production, and a new thought and a new method are provided for reducing the concentration of bivalent copper ions in a marine environment and reducing marine biofouling.

This invention belongs to the field of graphene fiber processing technology, and relates to a two-step sizing process for graphene fibers. The sizing agent used in the first sizing step is denoted as sizing agent A, and the sizing agent used in the second sizing step is denoted as sizing agent B. Sizing agent A comprises a cationic polyether polyurethane slurry, a volatile ester co-solvent, and water; sizing agent B comprises a cationic polyether polyurethane slurry, a lubricant, and water. The lubricant is one or more of the following: polyether-modified polydimethylsiloxane, polyether-modified heptamethyltrisiloxane, oxidized polyethylene wax emulsion, polytetrafluoroethylene emulsion, and polyethylene glycol monooleate. After sizing, a polyurethane film layer forms on the fiber surface, which can absorb and disperse stress, improve bundle strength, bending performance, and abrasion resistance, solve the problems of fiber breakage and flyaways, and simultaneously fill the gaps between fibers, improving electrical and thermal conductivity to meet the requirements of high-speed weaving processing.

The utility model provides a kind of fabric for clothing and contain its sweat suit. The fabric includes surface layer, membrane layer and bottom layer. The surface layer uses warp plain or weft plain knitting technology, and is treated using water repellent finishing process. The water repellent finishing process used by the surface layer contains fluorine-free water repellent auxiliary and C4, C6 water repellent auxiliary. The membrane layer is thermoplastic polyurethane membrane layer or polyurethane membrane layer. The sweat suit prepared by the above-mentioned fabric has windproof and light rainproof effect, providing comfortable wearing experience for the wearer.

The invention belongs to the technical field of medical biological dressings, and provides a composite dressing with oxygen release and insulin delivery functions and a preparation method thereof.The composite dressing comprises a supporting base layer, a function slow release layer and a protective film layer which are sequentially compounded from bottom to top; the supporting base layer is a medical porous polyurethane film modified by plasma; the functional sustained release layer is composed of hyaluronic acid-chitosan composite gel, oxygen release microspheres and insulin liposome; the protective film layer is a polyethylene terephthalate film of which the surface is provided with a sawtooth edge easy to tear; through an integrated three-layer patch structure, by combining the synergistic effect of PLGA microsphere controlled-release oxygen, liposome low-molecular chitosan insulin delivery and gel matrix, the skin injury microenvironment is effectively improved, inflammation is inhibited, and the healing time is shortened.

The invention discloses silica gel combined type self-healing flexible robot skin and a preparation method thereof, and relates to the technical field of robot flexible materials. The method comprises the following steps: uniformly spraying a fluorine-containing self-healing waterborne polyurethane emulsion on the surface of a mold, and drying to obtain a fluorine-containing self-healing waterborne polyurethane film with the thickness of 0.04-0.06 mm; spraying a Karstedt platinum catalyst on the fluorine-containing self-healing waterborne polyurethane film, and then coating addition type double-component silica gel on the catalyst to obtain a semi-finished product; and spraying a waterborne polyurethane skin feeling treatment agent on the back surface of the semi-finished product to obtain the flexible robot skin. Resin used in the fluorine-containing double-bond waterborne polyurethane and the water-based skin feeling treating agent is polyether type waterborne polyurethane resin, after the fluorine-containing double-bond waterborne polyurethane is combined with the silica gel, operability of the surface of the silica gel is higher, the touch feeling is changed while the hand feeling of the silica gel is kept, the silica gel is highly similar to the human skin, and the skin feeling of the silica gel is improved. And the properties such as wear resistance and folding resistance can be improved.

The invention discloses a waterproof barrier adhesive tape in an aircraft cabin and a preparation method thereof, and relates to the technical field of adhesives. When the waterproof barrier adhesive tape in the aircraft cabin is prepared, graphene oxide sequentially reacts with 2, 5-dimethyl-2, 5-hexanediol and 5-amino-4-imidazole formamide, and modified graphene oxide is prepared; the pre-modified polysiloxane is subjected to a reaction with dimethyl phosphorus and 1, 2-epoxy chlorobutane in sequence, and functional polysiloxane is prepared; the preparation method comprises the following steps: reacting polycarbonate diol, polyethylene glycol, hydroxyethyl methylacrylate, isophorone diisocyanate, 4, 5-bis (hydroxymethyl)-2-phenyl-1H-imidazole and bis (hydroxymethyl) phenylphosphine to prepare polyurethane particles, and carrying out extrusion casting to form a film; mixing a polyacrylate emulsion, functionalized polysiloxane and modified graphene oxide, coating a polyurethane film with the mixture, and drying to obtain the waterproof barrier adhesive tape in the aircraft cabin. The prepared waterproof barrier adhesive tape in the aircraft cabin has a good bonding effect and a good flame retardant effect.

The application discloses a high-transparency nano-resin lens, which comprises a resin substrate, a nano-cellular membrane layer adhered to the front surface of the resin substrate through an organic silica gel layer, the nano-cellular membrane layer comprising an inner thermoplastic polyurethane film, a polyvinyl alcohol film, a triacetate cellulose film and an outer thermoplastic polyurethane film, and a functional membrane layer plated on the surface of the nano-cellular membrane layer; wherein the nano-cellular membrane layer has a honeycomb structure. The nano-cellular membrane layer with the honeycomb structure is arranged to improve the light transmittance of the resin lens, enhance the definition and reduce the interference of stray strong light.

This invention discloses a velvety sofa fabric and its preparation method, belonging to the field of textile fabric processing technology. This invention provides a hollow orange-petal-shaped microfiber nonwoven fabric as the base material, and a waterborne polyurethane (WPU) film as the polymer coating. Hollow orange-petal-shaped microfiber / waterborne polyurethane (PET-PA6 / WPU) synthetic leather is obtained through dry film transfer technology, achieving the green preparation of microfiber leather. Fluoropolymers, due to their low surface free energy, high chemical and thermal stability, excellent adhesion and water and oil repellency, self-cleaning properties, low refractive index, and low dielectric constant, are widely used in construction, functional coatings, electronic devices, the automotive industry, and fabric finishing. Using this finishing agent gives the sofa fabric water, oil, and stain repellency.

This utility model relates to the field of polyurethane film edge finishing technology, specifically polyurethane film edge finishing equipment, including a slitting machine body. A fixing rod is fixed to the slitting machine body. A film support rod and a film guide rod are installed on the slitting machine body. Several collars are installed on the fixing rod via a fixing mechanism. An edge finishing mechanism is fixed to each collar. The edge finishing mechanism includes a hot cutting blade and a fixing frame. The fixing frame is fixed to the side wall of the collar. The hot cutting blade is installed inside the fixing frame. A hydraulic rod is installed on the side of the collar away from the fixing frame. A mounting block is fixed to the telescopic end of the hydraulic rod. A connecting shaft is fixed to the mounting block. A hot pressure roller rotates on the connecting shaft. After being cut by the hot cutting blade, the polyurethane film can be conveyed to a position near the hot pressure roller via the film support rod. The hot pressure roller contacts the film surface and squeezes the film. The smooth surface of the hot pressure roller can flatten the uneven edges of the polyurethane film after hot cutting, forming a uniform sealing thickness.

The utility model discloses a silica gel indwelling needle patch, and relates to an indwelling needle patch. Comprising a recording strip, release paper, a polyurethane film layer, a microporous silica gel layer, a silica gel adhesive tape strip and an embossed protective layer, the release paper is divided into a first part and a second part, the first part of the release paper is adhered to the polyurethane film layer, an opening is formed in the center of the first part, and the recording strip is arranged on the outer surface of the second part of the release paper; the polyurethane film layer is adhered to the microporous silica gel layer; one surface of the embossed protective layer is divided into a first area and a second area, and the microporous silica gel layer and the silica gel adhesive tape strip are respectively adhered to the first area and the second area of the embossed protective layer. Due to the adoption of the design of the microporous silica gel layer, the air permeability of the indwelling needle patch is improved, the risk of curling and falling off is reduced, the comfort and the fitting feeling of a product are improved, the irritation and the injury to the skin of a patient are reduced, the practicability is improved, and the indwelling needle patch has certain advantages.

An elastic sheet for an all-solid-state battery includes a polyurethane film, a first (meth)acrylate resin layer on a first surface of the polyurethane film, and a second (meth)acrylate resin layer on a second surface of the polyurethane film.

This invention belongs to the field of biomedical materials, specifically providing a highly permeable hydrophilic polyurethane artificial membrane based on chemical grafting and its preparation method, comprising the following steps: S1 - Substrate pretreatment: Immersing a polyurethane film in an organic solvent, ultrasonically cleaning and soaking for 0.5-2 hours, then removing and drying to constant weight to obtain a pretreated substrate; S2 - Preparation of hydrophilic modified polyurethane: Completely immersing the substrate obtained in step S1 in a hydrophilic modification solution, introducing an inert gas for 10-30 minutes, heating to 35-45°C, and reacting under stirring or shaking in the dark for 6-24 hours to obtain a hydrophilic modified polyurethane membrane; S3 - Post-treatment: The hydrophilic modified polyurethane membrane from step S2 is sequentially acid-washed, water-washed, and then vacuum-dried to obtain the hydrophilic polyurethane artificial membrane. The hydrophilic polyurethane artificial membrane of this invention, prepared by chemical grafting, possesses high permeability and excellent mechanical properties.