54 results about "Polyurethane membrane" patented technology

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.

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 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 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.

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.

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 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 invention discloses a wound dressing capable of preventing seawater soaking. The wound dressing is prepared from a dressing gel material and a polyurethane (PU) film, the dressing gel material is prepared from the following components: chitosan, freeze-dried A-S-Pvfp5-P recombinant protein, 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide, N-hydroxysuccinimide and a double-network hydrogel material, and the double-network hydrogel material is prepared from the chitosan, the freeze-dried A-S-Pvfp5-P recombinant protein, the 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide and the N-hydroxysuccinimide. The seawater soaking prevention wound dressing provided by the invention solves the problems of insufficient seawater soaking prevention effect, poor adhesion performance and poor wound closing effect in the prior art.

The application discloses a kind of single-hole organic glass and inorganic glass bonding method for reducing the stress of opening edge, multiple inorganic glass substrates are stacked to form inorganic glass assembly, after stacking, the excess part of bonding layer is removed, and the inorganic glass opening is exposed, the inorganic glass assembly, the fourth film adhesive layer, the organic glass substrate and the press plate glass are stacked together in sequence to form a first stack, the auxiliary plug round tool is cut and ground, the wrapped silicone strip is wound outside the auxiliary plug round tool and fixed, then the auxiliary plug round tool with the wrapped silicone strip is placed in the organic glass opening of the organic glass substrate and the opening of the cover plate glass, the circular breathable felt is cut and filled into the inorganic glass opening of the inorganic glass assembly, two pieces of polyurethane film completely wrap the first stack and form a second stack by vacuumizing, and the second stack is heat treated to eliminate the stress of opening edge. The application solves the problem of existing technology organic glass opening edge cracking.

Provided is a pressure-sensitive adhesive sheet which is provided with a pressure-sensitive adhesive layer comprising a pressure-sensitive adhesive composition containing a water-dispersed polymer, and which is suitable for suppressing inflammation of the skin during use. The pressure-sensitive adhesive sheet (10) is provided with a pressure-sensitive adhesive layer (1) formed from a pressure-sensitive adhesive composition containing a water-dispersed polymer. In the pressure-sensitive adhesive sheet (10), the moisture permeability P of the pressure-sensitive adhesive layer (1) as determined by the following test is 900 g / (m < 2 >. 24 h) or more. Test: A laminate (20) comprising an adhesive layer (1) having a thickness of 25 [mu] m and a polyurethane film (5) having a thickness of 30 [mu] m is produced. The laminated body (20) is adhered to a glass container (30) in such a manner that an opening (31) of the glass container (30) containing water (35) is closed. The glass container (30) is left to stand for 24 hours at a temperature of 40 DEG C and a humidity of 30% RH, and the weight of water that has passed through the laminate (20) from the inside of the glass container (30) is determined. The ratio of the weight (g) to the opening area (m2) of the opening (31) is determined as the moisture permeability P.

The application discloses an antistatic polyurethane protective film and a preparation method and application thereof. The protective film comprises a polyurethane film base material and an antistatic coating layer coated on at least one surface thereof, and the antistatic coating layer is composed of the following raw materials in parts by mass: 100 parts of an aliphatic polyurethane acrylate resin; 20-40 parts of an end isocyanate group ionic liquid prepolymer; 10-20 parts of an active diluent; 2-10 parts of a photoinitiator; 0.1-1 part of a leveling agent; and 300-400 parts of a first solvent. The end isocyanate group ionic liquid prepolymer is a monoisocyanate group terminated ionic liquid prepolymer solution obtained by urethane reaction of a hydroxyl-containing ionic liquid monomer and excess diisocyanate in an organic solvent. The surface resistivity of the coating layer is stabilized at 10 8 Ω / sq-10 9 Ω / sq, the coating layer has a light transmittance of ≥ 90% and a haze of ≤ 2%.

This application provides a hydrogel wound dressing and its preparation method, comprising: a hydrogel layer, a support layer, and a protective layer. The hydrogel layer is prepared from the following raw material components in the following mass ratio: 10-15% polyvinylpyrrolidone, 5-8% polycaprolactone, 2-4% sodium carboxymethyl cellulose, 1-3% chitosan, 0.5-1.5% antibacterial agent, 0.1-0.3% antioxidant, 0.01-0.1% growth factor, 0.1-0.5% thermosensitive polymer, 0.05-0.15% graphene quantum dots, 0.5-1.5% self-healing polymer, 0.5-1.5% pH-sensitive material, 0.1-0.3% nano-titanium dioxide, and the balance being deionized water. The support layer is a porous polylactic acid film with a thickness of 0.1-0.3 mm. The protective layer is a breathable polyurethane film with a thickness of 0.2-0.4 mm. Through the synergistic effect of the antibacterial agent, nano-titanium dioxide, and graphene quantum dots, the antibacterial performance of the dressing is significantly improved.

The application belongs to the technical field of photocatalytic materials, and specifically discloses a static electrospinning photocatalytic nanofiber membrane and a preparation method and application thereof. The preparation method of the photocatalytic nanofiber membrane comprises the following steps: dissolving bismuth salt and polyurethane in a solvent, mixing, and forming a precursor liquid; then electrospinning the precursor liquid to obtain a precursor fiber membrane; and then soaking the precursor fiber membrane in an iodine salt solution, heating, and reacting to obtain the photocatalytic nanofiber membrane. The surface of the iodine bismuth oxide polyurethane membrane with polyurethane as a composite carrier is more hydrophilic, the contact with printing and dyeing wastewater can be enhanced, and thus the catalytic activity of the fiber membrane is improved; and the precursor fiber membrane and the low-temperature in-situ growth synthesis strategy realize the close combination of the precursor fiber membrane and BiOI, high-temperature calcination is not needed, the damage to the fiber membrane caused by high-temperature calcination is effectively avoided, the processing performance of the fiber membrane is improved, and the service life is prolonged.

The application belongs to the technical field of lithium ion batteries, and discloses a polyimide-based composite aerogel material PI@SiO2 and application thereof. The polyimide-based composite aerogel material PI@SiO2 is prepared by introducing silica aerogel with super-strong heat insulation function into a porous aerogel structure framework with high-temperature resistance and flame retardant characteristics, which is composed of polyimide, hydroxyapatite and ammonium polyphosphate through freeze-drying, high-temperature calcination and other methods. The lithium ion battery group heat insulation and flame retardant plate made by packaging the polyimide-based composite aerogel material provided by the application with epoxy resin film or polyurethane film with flame retardant effect can effectively block the spread of battery thermal runaway and ensure that the internal materials of the battery not in thermal runaway are not damaged to a large extent.

This invention relates to an artificial heart valve material, its preparation method, and an artificial heart valve device, belonging to the field of medical polymer materials and medical device technology. The main technical solution adopted is as follows: the artificial heart valve material is a composite structure film; the composite structure film includes a support layer located in the middle and encapsulation layers located on both sides of the support layer; the support layer is a porous polytetrafluoroethylene (PTFE) membrane; the encapsulation layers are polyurethane (PU) membranes; the polyurethane in the encapsulation layers permeates into the micropores of the porous PTFE membrane, forming a physically interpenetrating structure. This invention mainly solves the problem of insufficient bonding strength between polyurethane and PTFE in traditional composite methods. The valve material of this invention, used in the preparation of artificial heart valve devices, possesses good fatigue and tear resistance. When microcracks develop in the valve leaflets under long-term fatigue operation, this material can prevent the microcracks from expanding, effectively improving the fatigue life of the artificial heart valve device.

The utility model relates to the technical field of wound application, in particular to a high-moisture-permeability wound application which comprises a polyurethane film, an absorption pad and release paper which are sequentially arranged, the absorption pad is used for absorbing exudate at a wound, polyurethane pressure-sensitive adhesive is coated on the polyurethane film, and a fixing assembly used for fixing the polyurethane film is arranged at one end, far away from the absorption pad, of the polyurethane film. The fixing assembly comprises a fixing piece fixed to the polyurethane film, an avoiding hole matched with the absorption pad is formed in the fixing piece, a limiting groove is formed in the fixing piece, a limiting ring matched with the limiting groove is arranged in the limiting groove, connecting belts are symmetrically connected to the limiting ring, and connecting blocks matched with each other are arranged on the connecting belts. Therefore, the moisture penetrability of the wound application can be improved, the adhesion performance is mild, stripping is convenient and easy, the pain of a patient is relieved, and when the wound application is attached to a frequently moving limb part, the fixing stability of the wound application is improved.

The invention discloses a preparation method of a high-physical-property easily-separated waterborne polyurethane film. The preparation method comprises the following steps: step 1, preparing a high-crosslinking-degree waterborne polyurethane emulsion; and step 2, preparing the easily-separated film. According to the polyurethane film, an excessive isocyanate reaction system is adopted, a traditional acetone chain extension step is omitted, urea and biuret structures are generated through reaction with water, and the crosslinking degree and the mechanical property of the polyurethane film are improved. A swelling interface layer such as polyethylene glycol (PEG) is introduced between the polyurethane film and the base cloth, so that the film can be quickly stripped. The obtained film has high modulus, good flexibility and wear resistance, and is suitable for the fields of environment-friendly synthetic leather, separable coatings and flexible composite materials.

The present invention relates to a preparation method for a polysiloxane-modified polyurethane material. The preparation method comprises: activating the surface of a polyurethane film material, and reacting same with a small-molecule diisocyanate in anhydrous toluene under the action of a catalyst, so as to obtain a thin film that is surface-grafted with -NCO groups; and placing the surface-activated thin film in anhydrous toluene containing polysiloxane, reacting same, then removing unreacted diisocyanate and polysiloxane, and performing washing and drying to obtain a polyurethane film material that is surface-grafted with polysiloxane. Compared with an unmodified polyurethane film material, the modified film material exhibits better chemical stability; reaction conditions are mild; and the overall preparation process is simple and pollution-free.

The invention relates to the technical field of composite materials, and discloses an inflatable floating bridge high-pressure air rib outer layer material and a preparation method thereof. The outer-layer material of the high-pressure air rib of the inflatable floating bridge is of a layered structure and comprises an outer-layer weaving tube material, a middle-layer binder and an inner-layer air closing film. And carrying out polymerization reaction on the polymeric monomer and the functional monomer, and then adding the tackifier and the amino resin to obtain the adhesive. The binding agent has strong binding force with both the polyester-based weaving tube and the polyurethane film, so that the material shows very high peel strength and cohesiveness, the weaving tube material and the polyurethane air-closing film are tightly bonded and are not easy to separate and peel off, and the functional monomer contains a plurality of hydrophobic long carbon chains, so that the functional monomer has good adhesion to the polyester-based weaving tube and the polyurethane film. The waterproof performance of the acrylic resin binder is improved, and the prepared inflatable floating bridge high-pressure air rib outer layer material is high in bonding strength, good in waterproof performance and high in use durability.

The invention discloses a lignin-based polyurethane loose nanofiltration membrane and a preparation method and application thereof.The method comprises the steps that 1, lignin is dried, the dried lignin and dimethyl sulfoxide are blended and stirred to be fully dissolved, and a lignin solution is obtained; (2) firstly, slowly dropwise adding hexamethylene diisocyanate into the lignin solution, and then dropwise adding dibutyltin dilaurate to obtain a casting membrane solution containing lignin-based polyurethane; and (3) carrying out bubble removal treatment on the membrane casting solution, then uniformly pouring the membrane casting solution on a non-woven fabric, scraping the membrane casting solution by using a membrane scraping machine until a membrane is formed, then transferring the membrane into a deionized water coagulating bath for phase inversion, and after the phase inversion is completed, obtaining the loose nanofiltration membrane which takes the non-woven fabric as a supporting layer and a lignin-based polyurethane membrane as a separation layer. According to the invention, lignin and hexamethylene diisocyanate are used as main raw materials to prepare the polyurethane loose nanofiltration membrane, and the prepared membrane has relatively high interception capability on an anionic dye solution.

The invention belongs to the technical field of functional composite fabrics, and discloses a high-temperature-resistant anti-blocking double-membrane microporous multi-layer fabric and a preparation method thereof. The garment body is made of fabric, the fabric sequentially comprises an outer layer, a middle layer and an inner layer from outside to inside, the outer layer is composed of shell fabric and a microporous membrane layer, the middle layer is composed of an environment-friendly solvent-free polyurethane reaction type hot melt adhesive layer, the inner layer is composed of base fabric and a high-temperature-resistant thermoplastic polyurethane membrane, and the microporous membrane and the polyurethane membrane are both in a prefabricated independent thin film form and are bonded through a point-shaped structure. And double-membrane isolation is realized. According to the structure, dust, grease and detergent residues are effectively prevented from blocking the microporous membrane, and the washing durability of the fabric and the gluing stability in a high-temperature environment are improved. According to the preparation method, a double-film laminating process is adopted, and a multi-layer composite structure is formed through roller coating, spot laminating and curing. The fabric has good moisture permeability, waterproofness and thermal stability, and is suitable for the field of outdoor, military police and protective high-performance textiles.

The utility model discloses a kind of cutting mechanism for polyurethane film, including cutting table, the bottom of cutting table is fixedly connected with four corresponding distribution's supporting leg, the outside of cutting table is fixedly connected with two corresponding distribution's fixed plate, the top of two fixed plate is fixedly connected with connecting plate, the top of connecting plate is fixedly connected with first electric push rod, the output of first electric push rod is fixedly connected with cutting knife, the top of cutting table is provided with mobile flattening mechanism, the top of cutting table is provided with fixed mechanism. The mobile flattening mechanism of being set can be conveniently rolled and flattened to polyurethane film, so that polyurethane film is not wrinkled when cutting, and the cutting is more neat, the fixed mechanism of being set can be conveniently fixed to one end of polyurethane film, so that cutting is more convenient.