1537 results about "Thermoplastic polyurethane" patented technology

The invention provides a low-voltage cable, and relates to the technical field of cables, the low-voltage cable comprises a conductor layer, a support layer, a shielding layer and a sheath layer, the conductor layer is composed of multiple strands of fractal stranded conductors, and each fractal stranded conductor comprises an inner-layer superfine silver-plated copper wire, a middle-layer copper-clad aluminum wire and an outer-layer nickel-plated copper alloy wire; the supporting layer wraps the conductor layer and comprises an inner supporting layer, a dynamic framework layer and an outer restraint layer, the inner supporting layer is an obliquely wound aramid fiber woven belt, the dynamic framework layer is formed by alternately arranging shape memory polymers and carbon fiber composite belts, and the outer restraint layer is a spirally wound silica gel-glass fiber composite rope. The shielding layer comprises a tinned copper wire woven mesh; the sheath layer is a thermoplastic polyurethane matrix, a microcapsule self-repairing agent is dispersed in the thermoplastic polyurethane matrix, a microcapsule comprises a siloxane prepolymer, and the thermoplastic polyurethane matrix further comprises graphene nanosheets. Through collaborative design of the fractal stranded conductor layer, the dynamic skeleton support layer, the shielding layer and the self-repairing sheath, comprehensive improvement of cable performance is realized.

The invention discloses a preparation method of a cellulose acetate / thermoplastic polyurethane / polypyrrole composite conductive nanofiber aerogel composite pressure sensing material. The preparation method comprises the following steps: (1) preparing a cellulose acetate and thermoplastic polyurethane spinning solution; (2) preparing a cellulose acetate / thermoplastic polyurethane composite nanofiber membrane; (3) preparing cellulose acetate / thermoplastic polyurethane short nano dispersion liquid; (4) preparing a cellulose acetate / thermoplastic polyurethane / polypyrrole polymerization solution; and (5) preparing the cellulose acetate / thermoplastic polyurethane / polypyrrole composite conductive nanofiber aerogel. According to the preparation method, a high-temperature thermal annealing process is not needed, and the prepared nanofiber composite aerogel has high conductivity, ultralow volume density, high compression deformation performance and high pressure resistance sensing sensitivity.

The invention relates to the technical field of refrigeration material preparation, in particular to an efficient passive radiation refrigeration material suitable for a sub-super environment and a preparation method and application of the efficient passive radiation refrigeration material. The method comprises the following steps: uniformly mixing thermoplastic polyurethane, sunlight high-reflection inorganic particles and a phase change material in a solvent; after a chemical foaming agent is added, the obtained suspension liquid is heated and foamed in a confinement mold, and wet gel is formed; and finally, carrying out freeze drying treatment to obtain the composite porous aerogel. The prepared material has a micro-nano porous skeleton formed by TPU, and inorganic particles and PCM are uniformly dispersed in the skeleton wall. Through component cooperation and a special porous structure, the material has extremely high sunlight reflectivity and mid-infrared emissivity, self-adaptive temperature regulation and control are achieved through PCM phase change, the problem that refrigeration of a traditional material fails in the sub-environment such as the vertical surface is effectively solved, and efficient sub-super-environment heat management is achieved.

The invention discloses composite conductive powder for preparing conductive silver paste and the conductive silver paste, and particularly relates to the technical field of electronic materials.The composite conductive powder is of a double-shell core-shell structure composed of a silver metal inner core, a silicon dioxide middle coating layer and a silver nanoparticle self-assembled outer layer and is subjected to ultraviolet irradiation treatment; the conductive silver paste is based on the composite conductive powder and is matched with cerium oxide modified glass powder, graphene nanosheets, thermoplastic polyurethane resin and a dibasic acid ester solvent to form a low-temperature environment-friendly formula. The volume resistivity of the conductive silver paste is as low as 1.2 * 10 <-6 > omega.cm, the curing temperature is reduced to 120 DEG C, the content of volatile organic compounds meets the environmental protection standard, meanwhile, the tensile strength is improved by 50%, the conductive silver paste can bear 500 times of bending circulation without breakage, the adhesive force reaches the level 0 of a cross-cut method, the strict requirement of a high-performance electronic device for the conductive silver paste is effectively met, and the conductive silver paste has wide application prospects.

The invention discloses a forming device and a forming method of a high-temperature-resistant low-temperature-resistant high-toughness cable. According to the invention, based on a double-substrate synergistic system of hydrogenated nitrile rubber and polyether type thermoplastic polyurethane, and in combination with a dynamic vulcanization crosslinking technology, the cable keeps excellent flexibility and tear resistance in a wide temperature range of-60 DEG C to 125 DEG C. A three-dimensional reinforced network of nano silicon dioxide and carbon nanotubes is directionally dispersed in a matrix, and mechanical support of aramid short fibers is matched, so that the cable is endowed with bending fatigue resistance, the durability of the drag chain cable in a high-frequency torsion scene of an oil platform exceeds 30 million cycles is realized, and the service life of the drag chain cable is prolonged. The problem of breakage caused by low-temperature embrittlement and high-temperature softening of a traditional cable is fundamentally solved, the synergistic effect of the perfluoropolyether surface modifier and the composite anti-aging system enables the cable to form a stable protective layer in strong acid, strong alkali, salt mist and oil stain environments, and chemical corrosion and ultraviolet irradiation are effectively resisted.

The invention relates to the technical field of cables, and discloses a corrosion-resistant waterproof cable and a preparation method thereof. The corrosion-resistant waterproof cable sequentially comprises the conductor, the insulating layer, the shielding layer, the waterproof layer and the sheath layer from inside to outside, the waterproof layer is extruded by polyethylene, and the waterproof performance of electric materials can be improved; the sheath layer adopts modified PVC and a thermoplastic polyurethane elastomer as main raw materials, and functional aids such as a plasticizer, a heat stabilizer, a lubricant, a composite flame retardant and the like are added, so that the sheath layer is endowed with excellent corrosion resistance, flame retardance and the like. Therefore, the cable prepared by the invention has a good application prospect in a humid and corrosive environment.

The invention discloses a bio-based thermoplastic polyurethane coating material easy to degrade quickly and a controlled-release fertilizer. The coating material comprises 0.8-2.0 parts of a biological chain matrix and 0.5-1.5 parts of a chain reinforcing agent; the biological chain matrix is formed by mixing pre-oxidized vegetable oil diol and bio-based polyester diol; the chain reinforcing agent is formed by mixing a curing agent, a hardening agent and a toughening agent. The bio-based thermoplastic polyurethane coated controlled-release fertilizer comprises fertilizer particles and a bio-based thermoplastic polyurethane coating material sprayed on the surfaces of the fertilizer particles, the spraying amount of the bio-based thermoplastic polyurethane coating material is 0.8-10% of the mass of the fertilizer particles. By accurately regulating and controlling the formula of the film material, the physical properties such as tensile strength and toughness of the bio-based thermoplastic coating material can be jointly improved, so that a more excellent controlled release effect is achieved, and the contradiction between the degradability and the controlled release property of the existing bio-based polyurethane coating material is solved.

The invention belongs to the field of functional textile materials, and provides a directional moisture-conducting, dry, comfortable, breathable and quick-dry fabric and a preparation method thereof. A three-layer composite structure design is adopted, the outer layer is a gradient wetting structure formed by attaching a thermoplastic polyurethane film subjected to single-face thermal orientation treatment and knitted fabric, the middle layer is a hydrophilic non-woven fabric, the inner layer is a knitted fabric subjected to hydrophilic finishing, and the two layers are compounded through a hot melt adhesive dot-shaped net. Hydrophilic blocks of the thermoplastic polyurethane film are directionally enriched through single-face contact heating, gradient distribution with one hydrophilic side and one hydrophobic side is formed, and the hydrophobic surface is coated with a low-surface-energy coating. The fabric has excellent one-way moisture conduction performance, moisture can be rapidly transmitted from the inner layer to the outer layer and rapidly volatilized, dryness and comfort of the close-fitting fabric are kept, meanwhile, the fabric has good air permeability and quick-drying performance, the moisture conduction rate is increased by 30% or above compared with that of traditional fabric, and the fabric is suitable for being popularized and applied. The fabric has wide application value in the fields of sportswear, outdoor equipment, leakage-proof underpants and the like.

The invention relates to the field of wear-resistant materials, in particular to a high-melt-strength thermoplastic polyurethane elastomer and a preparation method thereof. The thermoplastic polyurethane elastomer with high melt strength is prepared from the following raw materials in parts by mass: 60 to 80 parts of a polyol agent, 25 to 40 parts of isocyanate, 6 to 12 parts of a chain extender, 5 to 15 parts of a melt reinforced composition, 3 to 6 parts of a polymerization additive, 0.05 to 0.15 part of an organic tin catalyst, 0.2 to 0.4 part of an antioxidant, 0.4 to 0.6 part of a hydrolysis stabilizer and 0.1 to 0.3 part of a coupling agent. The high-melt-strength thermoplastic polyurethane elastomer provided by the invention not only can have high melt strength, processability and mechanical properties, but also can keep good transparency, flexibility and other comprehensive properties, and the performance is prevented from being greatly sacrificed, so that the application environment of the thermoplastic polyurethane elastomer is ensured.

A toy ball includes an clastic shell that defines a receiving cavity and an actuation module mounted in the cavity. The actuation module is detachably connected to the clastic shell and provides driving force to roll and / or enhance bouncing. The clastic shell includes expanded thermoplastic polyurethane (E-TPU) to provide low weight, high rebound, and compressive resistance.

The invention discloses a flame-retardant thermoplastic polyurethane elastomer material and a preparation method thereof, and belongs to the technical field of modified nano materials. The preparation method comprises the following steps: dissolving melamine, phytic acid and boron nitride in deionized water, carrying out oil bath, adding a coupling agent, stirring, carrying out vacuum filtration, washing with water, and drying to obtain a layered nano flame retardant; the preparation method comprises the following steps: dispersing a flame retardant in deionized water containing a nonionic dispersant, and carrying out ultrasonic treatment; the preparation method comprises the following steps: reacting polyether polyol with diisocyanate to obtain a primary prepolymer; adding other auxiliary agents, stirring, and carrying out gradient heating polymerization; and injecting into a mold, curing for 6-12 hours at 105-125 DEG C, and drying for 12-24 hours at 80-90 DEG C. A phosphorus-nitrogen-silicon ternary synergistic flame-retardant system is introduced, the boron nitride nanosheet surface grafting and dynamic pre-polymerization-gradient heating process is optimized, the dispersity is improved, and smoke suppression and thermal stability are achieved. Compared with the prior art, the flame retardant efficiency is high, the mechanical property is excellent, and environmental friendliness is achieved.

The invention discloses a preparation method of a flexible electromagnetic shielding type force sensor based on a coaxial structure, and belongs to the field of flexible electronics and intelligent sensors. According to the method, a coaxial wet spinning process is adopted, a core-sheath structure conductive fiber is constructed, a core layer is made of a multi-walled carbon nanotube (CNT) and thermoplastic polyurethane (TPU) composite material, and a sheath layer is made of a nickel-coated carbon nanotube (Ni-CNT) and TPU composite material. By regulating and controlling the proportion of the core sheath, the construction of the gradient conductive network is realized, and the sensing sensitivity, the electromagnetic shielding performance and the mechanical flexibility are improved. The obtained Ni-CNT-coated CNT fiber is made into fabric and integrated in a sensing glove, and multi-finger bending detection and wireless man-machine interaction control are achieved. The sensor has the advantages of high sensitivity, wide strain detection range and excellent electromagnetic shielding effectiveness, is suitable for the fields of intelligent wearing, anti-interference man-machine interface and fire-fighting equipment, and can also be expanded to complex application scenes such as aerospace teleoperation.

The invention discloses an ultra-flexible stretchable dimming film and a preparation method thereof, and relates to the technical field of dimming films, and the ultra-flexible stretchable dimming film comprises an upper transparent electrode layer, a dimming function layer and a lower transparent electrode layer which are sequentially stacked from top to bottom; the preparation method comprises the following steps: 1) preparing a main matrix material / ultraviolet curing resin mixture; 2) assembling the dimming film; and 3) ultraviolet light curing. According to the invention, through surface phosphonic acid functionalization treatment, covalent bond anchoring of cerium oxide nanoparticles is realized on a thermoplastic polyurethane fiber network; by constructing a full-thermoplastic polyurethane material system, the breakthrough of interfacial compatibility between a fiber reinforced phase and a polymer matrix is realized, so that the film has high tensile strain capacity and excellent fatigue resistance on the premise of keeping high transparency.

The invention discloses a bionic anti-drag protective film based on a surface micro-nano structure and a preparation method of the bionic anti-drag protective film, and relates to the technical field of anti-drag film preparation. According to the preparation method, the high-strength nitrogen-containing thermoplastic polyurethane film layer with the flame retardant property is prepared, one layer is coated with the hyperbranched polyurethane coating, the drag reduction functional layer with the microstructure is formed through embossing and photo-thermal dual curing, and the hyperbranched polyurethane coating can form a high-density cross-linked network during curing, so that the drag reduction performance is improved; according to the present invention, the hyperbranched polyurethane coating material has characteristics of good mechanical property and good weatherability, the hyperbranched structure can assist in dispersion of shrinkage stress and maintenance of coating surface flatness during heating, and the hyperbranched polyurethane coating material further contains nitrogen rings so as to provide the coating material with certain fire resistance.

The invention provides a light super-soft fire-resistant flame-retardant optical cable and a preparation method thereof. The light super-soft fire-resistant flame-retardant optical cable sequentially comprises a high-temperature-resistant optical fiber, a filling layer, a flame-retardant loose tube, a reinforcing layer, a heat insulation layer and a fire-resistant flame-retardant layer from inside to outside, the fireproof flame-retardant layer comprises the following preparation raw materials in percentage by mass: 55-65% of plasma activated mineral powder, 25-35% of a thermoplastic elastomer base material subjected to irradiation crosslinking treatment, 8-12% of a phosphorus-nitrogen intumescent flame retardant and 1.5-2.5% of a silane coupling agent; the nano mineral powder comprises a magnesium aluminum silicate compound, and the thermoplastic elastomer matrix comprises a blend of SEBS (Styrene-Ethylene-Butylene-Styrene) and TPU (Thermoplastic Polyurethane). The fire-resistant flame-retardant layer forms a ceramic protection layer at high temperature to perform fire-resistant flame-retardant protection and prevent heat transfer, and meanwhile, the heat insulation layer is matched to further prevent heat from being transferred to the cable core, so that the performance of the optical cable is ensured not to be influenced.

The invention relates to a glass fiber reinforced polyurethane composite material and a preparation process thereof, and belongs to the technical field of polymer composite materials. The formula of the glass fiber reinforced polyurethane composite material comprises the following components in parts by weight: 60-80 parts of thermoplastic polyurethane, 15-25 parts of modified glass fiber, 2-5 parts of an interface modifier, 1-2 parts of an antioxidant and 1-3 parts of a lubricant. A covalently bonded silane coupling agent-nano silicon dioxide composite transition layer is formed by mixing chopped glass fibers and continuous glass fibers to construct a synergistic enhancement system and combining argon-oxygen plasma activation and nano silicon dioxide sol coating processes, so that the interfacial shear strength is remarkably improved, the stress concentration is effectively relieved, and the service life is prolonged. The tensile strength and the impact strength of the material are obviously improved.

The present invention relates to the field of cable technology, and discloses a flame-retardant and wear-resistant charging pile cable and a preparation method thereof. The charging pile cable prepared by the present invention comprises a cable core, a heat insulation layer, a shielding layer, and an outer sheath layer. The outer sheath layer is made of thermoplastic polyurethane elastomer as the main raw material, with the addition of maleic anhydride grafted POE, reinforcing fillers, and composite flame retardants and other functional additives, so that the cable has excellent flame retardant and wear resistance. Among them, the reinforcing filler utilizes the synergistic effect between hexagonal boron nitride and polyimide containing siloxane segments and long-chain fluorocarbon structures to improve the wear resistance of the outer sheath layer. The composite flame retardant has higher flame retardant efficiency than traditional inorganic flame retardants.

The invention discloses a dynamically vulcanized polyurethane silicone rubber composite material and a preparation method thereof, and belongs to the technical field of high polymer materials, and the dynamically vulcanized polyurethane silicone rubber composite material comprises the following components in parts by mass: 40-50 parts of flame-retardant polyurethane particles, 50-70 parts of raw silicone rubber, 2-5 parts of hydrogen-containing silicone oil, 10-20 parts of a compatilizer and 0.1-0.2 part of a platinum catalyst, the flame-retardant polyurethane particles are prepared by mixing thermoplastic polyurethane particles and flame-retardant reinforced powder; the flame-retardant reinforced powder is prepared by mixing flame-retardant composite powder with chitosan and then mixing the mixture with montmorillonite; the organophosphorus flame retardant is coated in the reinforcing filler, so that migration of the organophosphorus flame retardant in the polyurethane silicone rubber composite material is reduced, the influence of the organophosphorus flame retardant on the mechanical property of the polyurethane silicone rubber composite material is reduced, and the flame retardant property is improved; and montmorillonite and silicon dioxide as carriers can be used as reinforcing fillers to improve the mechanical properties.

The invention belongs to the technical field of multifunctional heat-conducting materials, and relates to a heat-conducting super-hydrophobic flexible film and a preparation method thereof. Comprising the following steps: adding boron nitride powder into a mixed solution of isopropanol and deionized water to obtain a boron nitride solution; ultrasonically stripping the boron nitride solution, centrifuging, washing and drying to obtain boron nitride nanosheets; the preparation method comprises the following steps: dispersing boron nitride nanosheets in a mixed solution of N, N-dimethylformamide and tetrahydrofuran, carrying out ultrasonic treatment, adding thermoplastic polyurethane, and heating and stirring until the thermoplastic polyurethane is completely dissolved to obtain a TPU / BNNSs spinning solution; preparing the TPU / BNNSs spinning solution into a fiber film through an electrostatic spinning process, drying and stripping to obtain a TPU / BNNSs composite film; siO2 is added into a PDMS solution, ultrasonic dispersion is performed to obtain a mixed solution, the mixed solution is sprayed on the surface of the TPU / BNNSs composite film, and the heat-conducting super-hydrophobic flexible film is obtained after drying and curing. The problem that the performance of a traditional heat conduction material is reduced in a complex environment is effectively solved, and the heat conduction material is suitable for application scenes needing to meet the heat dissipation and antifouling requirements at the same time.

The invention belongs to the technical field of thermoplastic polyurethane elastomers, and relates to UV-resistant bio-based thermoplastic polyurethane and a preparation method thereof, and the UV-resistant bio-based thermoplastic polyurethane comprises the following components by weight: 35-70 parts of bio-based polyester diol; 15 to 55 parts of diisocyanate; 2 to 15 parts of a chain extender; 0.2 to 1 part of an antioxidant; 0.001 to 0.05 part of a catalyst; the bio-based polyester diol is obtained by polycondensation of dicarboxylic acid and dihydric alcohol; the dicarboxylic acid comprises biomass muconic acid. The bio-based polyester type diol is synthesized by adopting bio-based muconic acid with an ultraviolet absorption function, so that the bio-based and UV-resistant characteristics are realized, and the thermoplastic polyurethane obtained in the manner has a good ultraviolet absorption function and good transparency, has a relatively high tensile strength retention rate after ultraviolet aging, and can be used for preparing the thermoplastic polyurethane. The method can be used in the fields of ultraviolet protection coatings, building materials, sunscreen fabrics and the like.

The invention relates to the technical field of cables, and discloses a flame-retardant wear-resistant charging pile cable and a preparation method thereof. The charging pile cable prepared by the invention comprises the cable core, the heat insulation layer, the shielding layer and the outer sheath layer, the outer sheath layer is prepared by taking a thermoplastic polyurethane elastomer as a main raw material and adding functional aids such as maleic anhydride grafted POE, a reinforcing filler and a composite flame retardant, so that the cable has excellent flame retardance and wear resistance; wherein the reinforcing filler utilizes the synergistic effect between hexagonal boron nitride and polyimide containing a siloxane chain segment and a long-chain fluoroalkyl structure, so that the wear resistance of the outer sheath layer is improved; compared with a traditional inorganic flame retardant, the composite flame retardant is higher in flame retardant efficiency.

The invention discloses a polyester film for a blue adhesive tape, which is used for binding and packaging a battery of a new energy electric vehicle. The polyester film is prepared from 70-85 parts by weight of high-viscosity polyethylene glycol terephthalate, 5-12 parts by weight of thermoplastic polyurethane, 2-4 parts by weight of siloxane resin powder, 1-3 parts by weight of melamine cyanurate, 2-5 parts by weight of organic modified montmorillonite, 1-3 parts by weight of a coupling agent and 1-3 parts by weight of a coupling agent. 1-3 parts by weight of aromatic polyimide micro powder and 0.3-0.5 part by weight of ethylene glycol monostearate. The invention also discloses a preparation method of the polyester film. The polyester film for the blue adhesive tape is excellent in dielectric strength, flexibility, puncture resistance and flame retardance, the characteristics directly correspond to strict requirements of automobile lithium battery shell packaging, and comprehensive guarantee is provided for safety, reliability and environmental adaptability.

The utility model discloses a high-performance high-temperature-resistant oil-stain-resistant anti-interference medium-voltage power cable, and the power cable comprises a cable core which is formed by twisting a plurality of insulated shielding wire cores. A gap of the cable core is filled with thermoplastic polyurethane elastomer rubber; the cable core is wrapped by a superconducting silicon carbide fiber tape shielding wrapping layer, and the superconducting silicon carbide fiber tape shielding wrapping layer is wrapped by an LCP high-molecular liquid crystal polymer high-temperature-resistant fireproof layer in an extruded mode. A graphene aerogel layer is extruded outside the LCP macromolecular liquid crystal polymer high-temperature-resistant fireproof layer, a polysulfonamide fiber braid layer is lapped outside the graphene aerogel layer, a polyphenylene sulfide fiber tape is coated outside the polysulfonamide fiber braid layer through a semi-conductive adhesive, an armor layer is arranged outside the polyphenylene sulfide fiber tape, and the armor layer is wrapped outside the LCP macromolecular liquid crystal polymer high-temperature-resistant fireproof layer. And a hydrogenated butadiene-acrylonitrile rubber outer sheath is extruded outside the armor layer. According to the utility model, normal operation of a line can be ensured in a complex and severe environment for a long time, and the service life of the cable is greatly prolonged.

The invention provides a formaldehyde-removing hot-melt composite elastic material and bedding using the same. The material comprises 60-80 parts of a polymer matrix, 15-25 parts of a formaldehyde catalytic decomposition agent, 5-10 parts of a polarity regulator and 0.5-2 parts of a processing aid, and is formed in one step through melt blending-hot pressing foaming. A polymer matrix is in an island phase state constructed by thermoplastic polyurethane and an ethylene-vinyl acetate copolymer through melt blending, the Shore hardness of 80A-95A and the glass transition temperature smaller than or equal to 30 DEG C are both considered, and low-temperature high resilience is achieved. The catalytic decomposition agent is compounded by MIL-101 (Cr)-NH2 and aminated carbon quantum dots according to a ratio of (3-5): 1, and formaldehyde is continuously oxidized into CO2 and H2O at normal temperature without light. The silane-modified tourmaline is used as a polarity regulator, and particle agglomeration is inhibited and an interface polarization electric field is enhanced through epoxy group covalent bonding. The density of the obtained material is 40-60 kg / m < 3 >, the aperture ratio is larger than or equal to 80%, the air permeability is larger than or equal to 500 L / (m < 2 >. S), and the material is applied to comfortable layers of mattresses, pillows or back cushions and keeps efficient formaldehyde removal and mechanical supporting functions for a long time.

The invention relates to a phase change energy storage fiber with ultraviolet shielding and heat regulation and control functions and a preparation method of the phase change energy storage fiber. The preparation method comprises the following steps: dissolving thermoplastic polyurethane in N, N-dimethylformamide to form a spinning mother solution; the preparation method comprises the following steps: firstly, adding nano titanium dioxide and uniformly dispersing, then adding a silicon dioxide shell layer-octadecane core layer phase change microcapsule, and stirring and ultrasonically defoaming to obtain a uniform composite spinning solution; extruding the spinning solution into a coagulating bath consisting of isopropanol and deionized water through an injection pump, and coagulating and forming to obtain nascent fibers; finally, washing, solvent replacement, tension setting and drying treatment are conducted, and compared with the prior art, the obtained fiber has efficient ultraviolet shielding performance and remarkable phase change energy storage capacity and has wide application prospects in the fields of intelligent temperature adjusting textiles, outdoor protective garments, building heat management and the like.

The invention belongs to the field of functional composite fabrics, and provides a mosquito-repellent thermoplastic polyurethane composite fabric and a preparation method thereof.According to the mosquito-repellent thermoplastic polyurethane composite fabric and the preparation method thereof, the design that mosquito-repellent microcapsules of a core-shell structure are dispersed in a thermoplastic polyurethane hot melt adhesive layer is adopted, a microcapsule core layer comprises mosquito-repellent active ingredients such as icaridin, deet or dimethyl phthalate, and the mosquito-repellent active ingredients are dispersed in a thermoplastic polyurethane hot melt adhesive layer; the shell layer is made of a polyurea material and is prepared through an interfacial polymerization method, high-load stable dispersion and controllable dot matrix film forming of the microcapsule in a hot melt adhesive system are achieved, the content of the microcapsule can reach 0.5-15 wt%, the particle size is controlled to be 0.1-2.0 m, the drug loading capacity reaches 10-60 wt%, the problem that the mosquito-repelling microcapsule is prone to damage and failure in the high-temperature melting mixing and hot-pressing compounding process is solved, and the mosquito-repelling microcapsule has good application prospects. The prepared composite fabric is high in mosquito repelling rate, still keeps an effective mosquito repelling function after being washed for multiple times, and has a wide application value.

Articles and thermoplastic polyurethane compositions are described that comprise a thermoplastic polyurethane. Illustrative articles include a film, a structured film, a polishing layer, a molded component, or fibers. The thermoplastic polyurethane comprises the reaction product of a) at least one diol, b) at least one diisocyanate; c) optionally a diol chain extender; and d) at least one hydroxy -functional imidazole compound. The hydroxy -functional imidazole compound functions as a catalyst. The reaction product may further comprise e) a mono-alcohol, and / or f) a reactive compound that comprises hindered amine groups, that end cap the polyurethane chains. Also described are hydroxy¬ functional imidazole compounds and methods of making a thermoplastic polyurethane article.

The utility model relates to the technical field of thin film winding equipment, and discloses TPU thin film winding equipment which comprises a base, a feeding mechanism, a winding mechanism and a cutting mechanism are installed on the upper surface of the base, two sets of fixing plates are fixedly installed on the upper surface of the base, and first sliding grooves and second sliding grooves are formed in the outer surfaces of the two sets of fixing plates. A material guiding mechanism is arranged between the two sets of fixing plates, a second material guiding roller is rotationally connected between the two sets of fixing plates, and a limiting mechanism is arranged between the two sets of fixing plates. Through the cooperative work of the material guide mechanism, the second material guide roller and the limiting mechanism, the situation that the thin film is loosened during rolling is avoided, and the situation that the cut thin film is loosened on the table top, and consequently inconvenience is caused to follow-up rolling work is avoided.

The invention relates to the technical field of TPU, in particular to TPU foaming basketball leather capable of being fully recycled and a preparation method of the TPU foaming basketball leather. The TPU foaming basketball leather capable of being fully recycled comprises a TPU foaming film and a TPU film arranged at the upper end of the TPU foaming film, wherein the TPU film comprises the following components in parts by weight: 60-80 parts of TPU particles, 35-45 parts of a TPU-modified leather fiber composite material, 15-25 parts of hydroxyl-terminated nitrile rubber, 7-12 parts of a reinforcing filler, 5-8 parts of a lubricant and 6-9 parts of an antioxidant. The TPU foaming basketball leather can be fully recycled, has excellent wear resistance, bending resistance, aging resistance, tensile strength, impact resistance and explosion resistance, is convenient to use and wide in application range, and the preparation method of the TPU foaming basketball leather is simple in process, easy to operate and control, stable in quality, low in reject ratio and high in yield, has very high economic effects and is beneficial to industrial large-scale production.