108 results about "Polyurethane membrane" patented technology

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 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 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.

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 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.

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.

This invention relates to the field of composite material technology and discloses a high-pressure air rib outer layer material for inflatable floating bridges and its preparation method. The high-pressure air rib outer layer material of this invention has a layered structure, comprising an outer layer of woven tubing material, an intermediate layer of adhesive, and an inner layer of air-tight membrane. Polymer monomers and functional monomers are polymerized, and then a tackifier and amino resin are added to obtain the adhesive. The adhesive exhibits strong adhesion to both the polyester-based woven tubing and the polyurethane membrane, resulting in high peel strength and adhesion. The woven tubing material and the polyurethane air-tight membrane are tightly bonded and not easily separated or peeled off. Furthermore, the functional monomers contain multiple hydrophobic long carbon chains, which improves the water resistance and waterproof performance of the acrylic resin adhesive. The resulting high-pressure air rib outer layer material for inflatable floating bridges has high bonding strength, good waterproof performance, and high durability.

The utility model relates to the technical field of fabrics, and discloses a hydrophobic antistatic plastic-coated fabric which comprises a nylon yarn layer, the top of the nylon yarn layer is fixedly connected with a plurality of conical wear-resistant blocks, the outer walls of the conical wear-resistant blocks are fixedly connected with a plurality of contact blocks, the bottom of the nylon yarn layer is fixedly connected with a polyester fiber layer, and the polyester fiber layer is fixedly connected with a waterproof layer. The bottom of the polyester fiber layer is fixedly connected with a polyurethane film, the bottom of the polyurethane film is fixedly connected with a conductive polymer coating, the interior of the conductive polymer coating is fixedly connected with a plurality of conductive wires, and the bottom of the conductive polymer coating is provided with a sweat absorbing mechanism. According to the utility model, the nylon yarn layer has high strength and wear resistance, the conical wear-resistant blocks and the contact blocks are used for reducing water molecule adhesion, and the polyester fiber layer provides flexibility and wrinkle resistance and is combined with the nylon yarn layer, so that the fabric is softer and more comfortable, absorbs and disperses external force to prevent moisture permeation, and can have hydrophobic and antistatic capabilities.

The invention discloses a novel greening cultivation structure based on a novel polyurethane material, and the structure comprises a planting layer which is used for bearing a cultivation substrate and a plant root system; the filtering layer is adjacent to the planting layer and is used for intercepting solid particles and allowing excessive moisture to infiltrate; the water storage and drainage layer is adjacent to the filtering layer and is used for temporarily storing downward seepage water and reversely releasing the downward seepage water when the soil humidity is reduced; the moisturizing layer is adjacent to the water storage and drainage layer and is used for continuously and slowly supplying water to the planting layer; the root separating layer is positioned below the moisturizing layer and is used for preventing a root system from penetrating and protecting a structure below the root separating layer; and the anti-permeation layer is formed by a polyurethane coating or a polyurethane film material at a time, forms a continuous seamless waterproof barrier and is used for preventing water and nutrients from leaking to the building structure. According to the invention, the anti-permeation layer formed at one time by polyurethane is cooperated with the water storage and drainage-moisturizing composite structure, so that the effects of zero leakage and self-humidity regulation are realized, the building load is reduced, and the survival rate of green plants is obviously improved.

The present invention discloses a method for laminating a hyperbolic glass display screen, comprising the following steps: preparing a first laminate; preparing a deformation tool: preparing two sets of the first deformation tool and the second deformation tool according to the curvature of a second curved glass substrate; preparing a second laminate: obtaining the second laminate using the deformation tool; preparing a third laminate: laminating and laminating the first laminate, the second laminate, a Teflon film, a buffer layer, a Teflon film, and a second curved glass pressing plate in this order to form a third laminate; wrapping the third laminate with two sets of upper and lower polyurethane films, evacuating the interior of the laminate, placing the laminate in an autoclave under high temperature and pressure, and removing the polyurethane film, the second curved glass pressing plate, the Teflon film, the buffer adhesive layer, and the Teflon film after exiting the autoclave, thereby finally forming a hyperbolic glass display screen. The present invention has the advantage of reducing the defective rate of display screen breakage during production and improving the yield rate.

This application relates to the field of protective films, disclosing a fingerprint-resistant and nail-print-resistant protective film and its preparation method. The fingerprint-resistant and nail-print-resistant protective film comprises, from top to bottom, a nano-anti-fingerprint coating, a self-healing coating, an elastic polyurethane film layer, and an adhesive layer, sequentially bonded together. The nano-anti-fingerprint coating is a nano-fluorine-containing coating, the self-healing coating is a self-healing polyurethane coating, and the adhesive layer is obtained by curing an adhesive. The adhesive is made from the following raw materials in parts by weight: 60-80 parts acrylic resin, 10-20 parts hydroxyacrylate monomer, 5-8 parts dipentaerythritol hexaacrylate, 3-5 parts cyclohexanediol-1,4-diacrylate, 2-6 parts methyl methacrylate, 1-5 parts isobornyl acrylate, 3-6 parts photoinitiator, and 1-3 parts antioxidant. The resulting protective film exhibits good fingerprint and nail-print resistance while also possessing high clarity and adhesion stability, and is not prone to edge lifting.

This invention discloses an aqueous TPU film and its production method, belonging to the field of polyurethane film production technology. This aqueous TPU film achieves self-healing by grafting disulfide bonds and using them as crosslinking agents, and by grafting benzotriazole and polytetrahydrofuran ether onto thermoplastic polyurethane using a silane coupling agent. This results in a self-healing function that can be achieved at room temperature (25°C) without the need for high-temperature equipment, relying solely on disulfide bonds, with a repair rate exceeding 80%. Simultaneously, benzotriazole specifically absorbs ultraviolet light, inhibiting photo-oxidative degradation; the polytetrahydrofuran soft segment (Tg≈-70°C) ensures the material maintains good elasticity at -40°C, solving the low-temperature embrittlement problem; the rigid benzene ring and the polyurethane hard segment synergistically enhance its mechanical strength: tensile strength ≥30MPa, tear strength ≥80kN / m, and the long ether chain soft segment ensures elastic recovery rate, achieving a balance between mechanical strength and toughness, suitable for coatings, films, seals, and other applications.

The invention belongs to the technical field of graphene fiber processing, and relates to a two-step sizing process of graphene fibers, a sizing agent used for primary sizing is marked as a sizing agent A, and a sizing agent used for secondary sizing is marked as a sizing agent B; the sizing agent A comprises cationic polyether polyurethane slurry, a volatile ester cosolvent and water; the sizing agent B comprises cationic polyether polyurethane slurry, a lubricating auxiliary agent and water; the lubricating additive is more than one of polyether modified polydimethylsiloxane, polyether modified heptamethyltrisiloxane, oxidized polyethlene wax emulsion, polytetrafluoroethylene emulsion and polyethylene glycol monooleate. A polyurethane film layer is formed on the surface of the sized fiber, stress can be absorbed and dispersed, the bundling property, bending property and wear resistance are improved, the problems of filament flying and filament breaking are solved, meanwhile, gaps between the fibers are filled, the electric conductivity and heat conductivity are improved, and the high-speed weaving processing requirement is met.

Disclosed in the present disclosure are a pure polyurethane condom having an adhesive layer, and a method for preparing the condom. The pure polyurethane condom having an adhesive layer at least comprises: a first polyurethane film layer; a polyurethane adhesive layer on the first polyurethane film layer; and a second polyurethane film layer on the polyurethane adhesive layer, wherein the 100% tensile modulus of the polyurethane adhesive layer is 2.5 N / mm2 or lower, and the structures of the first polyurethane film layer and the second polyurethane film layer are different from that of the polyurethane adhesive layer.

This invention provides polycarbonate polyol compositions, adhesive compositions, aqueous polyurethanes, aqueous dispersion compositions, polyurethanes for synthetic leather, and synthetic leather that provide polyurethane films with long service life, excellent operability, good appearance, and excellent weather resistance. A polycarbonate polyol composition is characterized by comprising: a polycarbonate polyol having terminal hydroxyl groups; (A) component: a compound represented by formula (A) below; and (B) component: a compound represented by formula (B) below, wherein the mass ratio of the aforementioned (A) component to the aforementioned (B) component ((A) / (B)) is 0.0001 to 0.1000. (In formula (A), R1 is hydrogen or an alkyl group having 1 to 12 carbon atoms, and R2 is an alkylene group having 1 to 12 carbon atoms.) (In formula (B), R3 is an alkylene group having 2 to 12 carbon atoms, and optionally has a straight-chain alkylene group, a divalent alicyclic hydrocarbon group, or a branched alkylene group.)

The invention discloses an anti-dripping flame-retardant waterborne polyurethane film material and a preparation method thereof, the anti-dripping flame-retardant waterborne polyurethane film material is formed by cross-linking and curing a branched chain type phosphorus-silicon-containing flame-retardant waterborne polyurethane emulsion and a phytic acid-silicon solution, and the phytic acid-silicon solution is prepared by reacting phytic acid with an amino silane coupling agent. According to the invention, phosphorus and silicon flame-retardant elements are introduced into a polyurethane molecular chain, and in combination with the in-situ crosslinking effect of a phytic acid-silicon system, the synergistic interaction of gas-phase flame retardance and condensed-phase char formation is realized.

The invention discloses a colorless, transparent and anti-ultraviolet waterborne polyurethane film based on a bio-based material and a preparation method of the colorless, transparent and anti-ultraviolet waterborne polyurethane film, and belongs to the technical field of polyurethane resin.The preparation method comprises the steps of preparing a compound 1, preparing a compound 2, preparing waterborne polyurethane emulsion and forming the film. In the preparation of the compound 1, a bio-based material methyl syringate is used, the compound 1 is used as a raw material and is subjected to a click chemical reaction with mercaptan to generate a compound 2, and then the compound 2 is used as a raw material to prepare the waterborne polyurethane emulsion. The preparation method disclosed by the invention can ensure that the waterborne polyurethane film has resistance to 275nm ultraviolet rays under the condition of being colorless and transparent, and a feasible method is provided for preparing a polyurethane material with ultraviolet shielding capability; the prepared waterborne polyurethane film can be used as an ultraviolet light shielding material to be applied to various fields with requirements on visible light and attractiveness, such as protection, wearable products and the like.

The invention discloses a preparation method of a windproof moisture-permeable polyurethane film and a fabric, the preparation method comprises the following steps: step S10: mixing and stirring polyurethane resin and an N, N-dimethylformamide solvent until the polyurethane resin is completely dissolved to obtain a polyurethane film casting slurry; s20, the surface of release paper is coated with the polyurethane film casting slurry to form a wet film, and the wet film is subjected to three-section type drying through a drying tunnel with different temperature zones; in the first-stage drying procedure, the product stays in a first temperature zone of 60-80 DEG C for 1-2 minutes; in the second-stage drying process, the product stays in a second temperature zone of 90-120 DEG C for 3-5 minutes; and in the third-section drying process, staying in a third temperature zone of 120-160 DEG C for 6-8 minutes. After the polyurethane film prepared by the preparation method is applied to garment materials, functional garments can be balanced in efficient moisture permeability and effective wind resistance.

The technology relates to a method of producing a moulded polyurethane hydrogel, for example a condom. The method involves forming a solution of at least one polyurethane having a molecular weight of between about 40000 to about 500000 in a water:organic polar solvent comprising less than about 40% (v / v) water; applying a layer of the solution to a mould; drying the layer of the first solution to form a polyurethane film on the mould; and contacting the polyurethane film with a swelling agent under conditions such that the film forms a polyurethane hydrogel with a swelling agent content of between about 1% to about 95%.

The application discloses an artificial fascia which is a composite material with a five-layer structure and is composed of fat stem cell-loaded amniotic membrane, PRP gel and polyurethane film; the five-layer structure material is in sequence of fat stem cell-loaded amniotic membrane, PRP gel, polyurethane film, PRP gel and fat stem cell-loaded amniotic membrane; the fat stem cell-loaded amniotic membrane is acellular amniotic membrane paved with fat stem cells and is prepared by the following method: inoculating fat stem cells on the acellular amniotic membrane and growing for 7-14 days to obtain the fat stem cell-loaded amniotic membrane. The application further discloses a preparation method of the artificial fascia and application of the artificial fascia in preparation of a biological patch for treating hernia or in preparation of a mesh for treating pelvic organ prolapse. The artificial fascia has high tensile strength, good tissue compatibility, good immune function and degradability, is a biological composite material with excellent performance, can be used for treating hernia and pelvic organ prolapse and has great application potential.

The present invention relates to the preparation of a membrane for use in the repair of the middle ear including perforations and damage to the tympanic membrane. More particularly, the invention provides for compositions and methods for preparing silk fibroin biocompatible polyurethane membranes using a solvent, which have improved biodegradation, mechanical and vibroacoustic properties.