85results about How to "Improves UV resistance" patented technology

The invention provides a back contact photovoltaic cell piece capable of preventing stacking scratch in a high-temperature passivation process. The back contact photovoltaic cell piece comprises a back contact photovoltaic cell piece body and a plurality of soft isolation protrusions located on the light receiving face of the back contact photovoltaic cell piece body. The soft isolation protrusions are used for supporting photovoltaic cells to be mutually isolated when the photovoltaic cells are stacked layer by layer, and the soft isolation protrusions are resistant to high temperature of 300 DEG C and do not become sticky or yellow within 3 hours. According to the invention, the soft isolation projections are arranged on the light receiving surface of the back contact photovoltaic cell sheet body to support mutual isolation of the photovoltaic cell sheets when the photovoltaic cell sheets are stacked layer by layer, so that the photovoltaic cell sheets can be protected from being scratched in the stacking and moving process; the flexible isolation protrusions are arranged on the back contact photovoltaic cell piece, the flexible isolation protrusions can be prevented from scratching the surface of the photovoltaic cell piece due to the specific flexibility of the flexible isolation protrusions, meanwhile, the flexible isolation protrusions can bear the passivation temperature of 300 DEG C or above and do not crack or yellow or adhere to the cell piece, and therefore it can be ensured that the back contact photovoltaic cell piece is subjected to high-temperature passivation in a multi-layer stacking mode, and the passivation efficiency is improved.

The invention discloses a preparation method of a high-performance anti-ultraviolet water-repellent polyester fiber. The preparation method comprises the following steps: S1, preparing core-shell composite modified particles; s2, preparing a modified finishing liquid; and S3, carrying out dipping treatment on the polyester fiber by adopting the modified finishing liquid, so as to obtain the high-performance anti-ultraviolet water-repellent polyester fiber. The polyester fiber provided by the invention has excellent ultraviolet resistance and water repellency, titanium dioxide and carbon dots are adopted as main components of an anti-ultraviolet agent, and the core-shell composite modified particles with a special structural system are constructed, so that the excellent ultraviolet resistance can be provided, and the polyester fiber has excellent water repellency. The carbon dots are added into the polyester fiber, the adverse effect caused by the photocatalysis of titanium dioxide can be overcome, the water repellency of the polyester fiber can be improved through the carbon dots, the negative effect of the photocatalysis of titanium dioxide is further reduced, and the carbon dots play multiple improvement roles in the polyester fiber.

The application provides a kind of composite modified asphalt with anti-ultraviolet and anti-salt corrosion aging and a preparation method thereof, and the preparation raw materials include base asphalt, linear SBS, GN, LDHs-PABA-CA, a compatibilizer and a stabilizer.The base asphalt is heated to a molten state to obtain molten asphalt.Under the condition of constant temperature heating and continuous stirring, linear SBS is added to the molten asphalt to make linear SBS swell in the molten asphalt, and then shear mixing is carried out to obtain SBS composite modified asphalt.GN and LDHs-PABA-CA are added to the SBS composite modified asphalt and stirred uniformly, and shear mixing is continued to obtain a composite modified asphalt base with anti-ultraviolet and anti-salt corrosion aging.A compatibilizer and a stabilizer are added to the composite modified asphalt base with anti-ultraviolet and anti-salt corrosion aging, and then the mixed system is stirred under constant temperature conditions to obtain a composite modified asphalt with anti-ultraviolet and anti-salt corrosion aging.

This invention discloses a self-cleaning radiative cooling coating based on biomass carbon quantum dots, its preparation method, and its application. The coating comprises a polymer film-forming resin, carbon quantum dots, and hollow glass microspheres; wherein the mass ratio of the polymer film-forming resin to the filler is 1:(0.1-0.5), and the mass ratio of the hollow glass microspheres to the carbon quantum dots is 1:(0.05-0.2). This invention synergistically enhances solar reflectivity through the photoluminescence properties of carbon quantum dots and the scattering properties of hollow glass microspheres, while simultaneously utilizing the synergistic effect of fluorinated resin and modified hollow glass microspheres to endow the coating with superhydrophobic self-cleaning function. A single layer of this coating can achieve a solar reflectivity >92%, mid-infrared emissivity >94%, and contact angle >150°, possessing both efficient daytime radiative cooling and long-lasting self-cleaning performance. It is particularly suitable for passive heat dissipation of outdoor equipment such as new energy vehicle charging piles, and features simple process, environmental friendliness, and excellent performance.

The invention relates to the technical field of building energy conservation, heat preservation and heat insulation materials, and discloses a flame-retardant phase-change heat preservation and heat insulation building material and a preparation method thereof.The preparation method of the flame-retardant phase-change heat preservation and heat insulation building material comprises the following steps that paraffin is loaded in ZnO / CuO hollow microspheres to obtain phase-change microspheres; modifying the phase change microspheres with polydopamine and acryloyl chloride to obtain functionalized phase change microspheres; the preparation method comprises the following steps: carrying out graft polymerization on a phosphorus-containing eugenol compound and 1-amino-5-hexene-2-alcohol on the functionalized phase change microspheres to obtain multifunctional phase change microspheres; polyether polyol, functionalized polyol, myricetin, multifunctional phase-change microspheres and the like are used as raw materials, foaming is performed, and the flame-retardant phase-change heat-preservation and heat-insulation building material is obtained. The flame-retardant phase-change heat-preservation and heat-insulation building material is excellent in heat-preservation and heat-insulation performance, flame-retardant performance and mechanical performance, has anti-ultraviolet performance and antibacterial and mildew-proof performance, can reduce erosion damage caused by external conditions, and prolongs the service life.

The utility model relates to a photovoltaic assembly comprising a cell string, the cell string comprises a plurality of slice cells, and the cutting surface of each slice cell is provided with a passivation layer; the photovoltaic module further comprises a plurality of light conversion films, the light conversion films are arranged on the sides of the passivation layers of the slice battery pieces, and the side edges of the light conversion films extend to the surfaces of the slice battery pieces to cover the passivation layers. The light conversion film of the photovoltaic assembly is used for covering the passivation layer, so that the damage of ultraviolet light to the passivation layer is greatly reduced, the ultraviolet resistance of the passivation treatment part of the sliced battery piece is improved, the power of the photovoltaic assembly is increased, and the service life of the photovoltaic assembly is prolonged.

The utility model relates to the field of car cover, especially a high heat insulation ultraviolet resistant car cover. The utility model wants to solve the technical problem to provide a kind of high heat insulation ultraviolet resistant car cover that can synergic barrier ultraviolet and infrared, with high heat insulation and ultraviolet resistant performance, improve the service life. A kind of high heat insulation ultraviolet resistant car cover, including the substrate layer, function layer and protective layer that are sequentially laminated settings;The function layer is alternatively stacked by multiple heat insulation layers and multiple ultraviolet resistant layers;The heat insulation layer is metal sputtering layer or metal oxide nanoparticle layer, for reflecting or absorbing infrared rays;The ultraviolet resistant layer is ultraviolet absorber coating, for absorbing ultraviolet rays. The utility model reaches the effect that synergic barrier ultraviolet and infrared, with high heat insulation and ultraviolet resistant performance, improve the service life.

According to the construction process, a hopper feeding device, a transmission system, a heating extrusion device, a cooling shaping device, a cutting device, a thread rolling device, a traction device, a grinding device and a sterilization device are arranged. The acupuncture needle prepared from the poly (lactic-co-glycolic acid) material has good non-toxic biodegradability, the acupuncture needle prepared from the poly (lactic-co-glycolic acid) material has good in-vivo biocompatibility, degradation products of lactic acid and glycolic acid can participate in metabolism of a human body, and finally carbon dioxide and water are formed and discharged out of the body. Meanwhile, the material is degraded by organisms and microorganisms in the natural world in the natural environment; by adding the traditional Chinese medicine pigment and adding a small amount of surfactant (phenol polyethylene glycol solvent or zinc naphthenate), the finished acupuncture needle has excellent weather resistance, light resistance, chemical corrosion resistance and ultraviolet resistance.

This utility model relates to a cooling and UV-resistant jacquard knitted fabric and garment. The front of the fabric consists of alternating concave and convex stripes, each made of 40D / 24F polyethylene nylon core yarn and 20-50D spandex. The knitting pattern is four loops per cycle, with the first four loops using the polyethylene nylon core yarn and spandex. The concave stripes are formed by loops knitted by the first needle of each of the first four loops. The convex stripes are formed by loops knitted by the second and third needles of the first and second loops, respectively, followed by float knitting, and by the second and third needles of the third and fourth loops, respectively, followed by float knitting and loop knitting. Through the combination and loop-forming method of the functional yarns—polyethylene nylon core yarn and high-elastic spandex—the fabric achieves a cooling sensation and highly effective UV blocking across the entire wavelength range, while also possessing breathability, high elasticity, and comfort.

The invention belongs to the technical field of high polymer materials, and relates to a preparation method and application of an ultraviolet aging resistant polyether ester elastomer, the preparation method comprises the following steps: firstly, carrying out esterification reaction or ester exchange reaction on 1, 4-cyclohexanedimethanol and an oxalic acid compound to obtain hydroxyl-terminated oxalate; mixing the hydroxyl-terminated oxalate with an aromatic dibasic acid compound, aliphatic dihydric alcohol, polyether glycol, a catalyst and an antioxidant, and sequentially performing esterification reaction, pre-polycondensation reaction and final polycondensation reaction to obtain the ultraviolet aging resistant polyether ester elastomer. Wherein the oxalic acid compound is oxalic acid or ester of oxalic acid; the aromatic dibasic acid compound is aromatic dibasic acid or ester of the aromatic dibasic acid. Compared with the prior art, the preparation method disclosed by the invention has the characteristics of simple preparation process and good ultraviolet aging resistance, a sample is placed in an ultraviolet aging test box to be irradiated for 30 days, the optimal tensile strength reduction percentage is 38.9% which is lower than 48.5% of the tensile strength before hydroxyl-terminated oxalate copolymerization, and the ultraviolet aging resistance is obviously improved.

This invention relates to a wear-resistant coated windproof fabric and its preparation method. The fabric comprises an inner layer and a coated windproof outer layer. The coated windproof outer layer is obtained by uniformly coating a modified polyurethane solution onto the surface of a base fabric and then drying it. The modified polyurethane solution comprises, by weight, 60-68 parts of an aqueous polyurethane solution, 10-16 parts of a biomass extract, 12-16 parts of silica, 5-8 parts of a thickener, and 3-7 parts of a dispersant. The fabric prepared by the method of this invention exhibits high wear resistance, windproofness, UV resistance, and flame retardancy. It is a wear-resistant coated windproof fabric. Using this fabric as a down jacket material can significantly improve the durability and protective performance of down jackets and meet the needs of different users in diverse environments, thus having significant practical value.

The utility model relates to acrylic plate technical field especially relates to acrylic flash point structural board, include: board body, the inside of board body is equipped with the accommodating groove of one end is open, and the side wall department of board body is equipped with two positioning holes close to the opening, and two positioning holes all in -line are equipped with the magnetic block of embedding, the bale, the bale is bonded and is pasted in the outer wall of board body, the pattern board, the pattern board is inserted in the accommodating groove and is consistent with the size of accommodating groove, the seal, both ends of seal are all solid and are equipped with the magnetic column, and the magnetic column is inserted in the positioning hole and is connected with the magnetic block magnetic suction, this acrylic flash point structural board can realize the replacement of different patterns and can improve the protectivity of acrylic plate, and can make the light source of side surface luminous homogenization, make the whole pattern display effect better, clearer, and have the flash silver effect, can improve the ornamental value, can strengthen the ultraviolet resistance ability simultaneously, prevent the board material aging, discoloration, improve the wear resistance and self -cleaning.

The utility model relates to the technical field of curtain walls, in particular to a high-energy-saving unit type curtain wall structure which comprises photovoltaic glass, a ceramic aluminum acoustic panel, a rubber and plastic heat preservation layer, an aluminum silicate heat preservation layer, an inorganic active heat preservation layer, an aluminum alloy connecting strip and a butt joint plate with an inner groove. The rubber and plastic heat preservation layer is in adhesive connection with the inner surface of the photovoltaic glass through hot melt adhesive, the outer surface of the aluminum silicate heat preservation layer is in adhesive connection with one side of the rubber and plastic heat preservation layer, and the outer surface of the inorganic active heat preservation layer is in adhesive connection with one side of the aluminum silicate heat preservation layer. According to the high-energy-saving unit type curtain wall structure, the photovoltaic glass not only serves as a building envelope, but also can convert solar energy into electric energy, partial self-supply of building energy is achieved, and the nanometer titanium dioxide coating in the inorganic active heat preservation layer has the photocatalysis effect under the illumination condition and can effectively decompose formaldehyde, VOCs and other harmful gases.

This utility model discloses a layered tent, relating to the field of tent technology. It includes an inner tent fabric and an outer tent fabric. The bottom of the inner tent fabric is equipped with windproof fixing ropes, and an inflatable support column is added to the outside of the inner tent fabric. The upper end of the inflatable support column has an inflation port, and a Velcro surface is added to the outer side below the inflatable support column. An installation top post is provided at the upper outer end of the inner tent fabric, and the outer tent fabric is distributed above the inner tent fabric. A limiting installation top is added to the top of the outer tent fabric, and a Velcro hook surface is added to the lower inner side of the outer tent fabric. The lower inner end of the outer tent fabric is provided with a nylon base layer, and an antistatic polyester layer is provided above the nylon base layer. A polyester fiber abrasion-resistant layer is provided above the antistatic polyester layer. This layered tent allows for quick and easy installation of the inner and outer layers, reducing manual labor intensity. It is also easy to assemble and disassemble, increasing the overall practicality and efficiency of the layered tent.

The application belongs to the technical field of thermoplastic elastomer modification, and discloses a silane coupling agent modified thermoplastic elastomer and a preparation method thereof, and aims to solve the technical defects of the existing thermoplastic elastomer, such as uncoordinated strength and toughness, poor temperature change resistance, insufficient ultraviolet stability, and poor comprehensive performance coordination. The modified thermoplastic elastomer is prepared by compounding a thermoplastic elastomer base material, a silane coupling agent modification liquid, a boron nitride-kaolin combined agent and other auxiliary agents according to specific weight parts. The preparation process of the application is simple and controllable, the obtained modified thermoplastic elastomer has balanced strength and toughness, a wide temperature change resistance range, excellent ultraviolet stability and outstanding comprehensive performance.

The present invention relates to the field of plant extracts, and in particular to the use of Fomes fomentarius extract for skin care. The present invention provides the use of Fomes fomentarius extract for enhancing anti-glycation activity, inhibiting melanin production, enhancing skin's ability to resist ultraviolet rays, enhancing SOD activity, or reducing ROS expression, wherein the Fomes fomentarius extract is obtained by solvent extraction of Fomes fomentarius, and the solvent is water, alcohol, or a mixture of alcohol and water.

The application discloses a method for constructing a water-repellent durable coating on a fabric surface and a product, tests a static contact angle of water on the fabric before and after finishing, and finds that the hydrophobic effect of combed polyester is the best after being treated in THF solvent and under the condition that the silicon content is 60%, the contact angle can reach 167.3+ / -0.3 degrees, and the fabric has super-hydrophobicity, self-cleaning and oil absorption capacity. The anti-ultraviolet test is conducted on the fabric finished by the microsphere coating, and it is found that the finished fabric has good anti-ultraviolet property. The mechanical stability of the microsphere coating of the combed polyester is tested, and it is found that the contact angle of the microsphere coating is still kept above 150 degrees after 36 cycles of adhesive resistance and 9 cycles of water resistance tests, which indicates that the pretreatment of the fabric by polydopamine is helpful to the improvement of the mechanical stability of the finishing coating. The finished fabric has good stability to acid and alkali liquid drops (pH=3-12), can maintain the hydrophobicity after long-time acid and alkali immersion, and has good wearing performance.

The present disclosure provides a profile and a forming method thereof, the forming method comprising: forming continuous fibers coated with an infiltrating material into an initial profile; and coating a coating material in a molten state on the initial profile to form a profile, wherein the coating material comprises a thermoplastic material. The forming method of the profile provided by the present disclosure has good mechanical properties of the formed initial profile, and the coating layer formed on the surface of the profile has good weather resistance, ultraviolet resistance, anti-aging, hydrolysis resistance and wear resistance.

The utility model relates to the technical field of flexible joints, and discloses an epoxy glass fiber reinforced plastic pipeline flexible joint which comprises a first pipeline, the right end of the first pipeline is fixedly connected with a first fixing ring, the right side of the first fixing ring is fixedly connected with an inserting ring, and the two sides of the inserting ring are fixedly connected with inserting blocks. A rotating shaft is rotatably connected to the interior of the inserting block, a clamping plate is fixedly connected to the right side of the rotating shaft, springs are fixedly connected to the two sides of the interior of the inserting block, the springs are fixedly connected to the two sides of the lower portion of the clamping plate, and the inserting ring is slidably connected to the interior of the inserting groove. And the inserting groove is formed in one side, far away from the first connecting ring, of the first connecting ring. According to the connecting sleeve, two pipelines can be conveniently and tightly connected, operation is easy, practicability is high, the strength, abrasion resistance and ageing resistance of the connecting sleeve can be effectively improved, and then the service life of the connecting sleeve is prolonged.

The utility model relates to the technical field of uvioresistant fabrics, and discloses an uvioresistant fabric which comprises a fabric, a protection mechanism is arranged on the inner wall of the fabric and used for protecting ultraviolet rays, a tensile mechanism is arranged on the inner wall of the protection mechanism and used for enhancing the tensile property of the fabric, and the fabric is arranged on the inner wall of the protection mechanism. The protection mechanism comprises an anti-ultraviolet coating, the outer wall of the anti-ultraviolet coating is fixed to the top of the inner wall of the cloth, the bottom of the anti-ultraviolet coating is fixedly connected with an anti-ultraviolet assembly, the bottom of the anti-ultraviolet assembly is fixedly connected with a filtering assembly, and the bottom of the filtering assembly is fixedly connected with a breathable assembly. The top of the outer wall of the ventilation assembly is fixedly connected with a water absorption assembly. According to the anti-ultraviolet fabric, the first anti-ultraviolet layer is fixed at the top of the inner wall of the fabric, and the water absorption of the fabric can be ensured by forming the plurality of water absorption holes in the outer wall of the fabric, so that the use requirements are met.

The present application relates to the technical field of pressure sensitive adhesive, in particular to a plastic film type low VOC environment-friendly pressure sensitive adhesive product.The plastic film type low VOC environment-friendly pressure sensitive adhesive product is composed of the following raw materials: methyl methacrylate, butyl acrylate, diacetone acrylamide, 2-ethylhexyl acrylate, vinyl trimethoxysilane, hydroxyethyl acrylate, reactive emulsifier, anionic emulsifier, non-ionic emulsifier, ammonium persulfate, sodium bisulfite, adipic acid dihydrazide, sodium bicarbonate, nano calcium carbonate, deionized water and pH regulator.The plastic film type low VOC environment-friendly pressure sensitive adhesive product has excellent holding power, peeling strength, durability and environmental protection.

This invention relates to the field of waterproof building materials technology, specifically to a TPO waterproof metal fusion board and its preparation method. The TPO waterproof metal fusion board comprises, from bottom to top, a metal plate, an adhesive layer, and a TPO waterproof layer. The adhesive layer comprises the following weight components: 40-50 parts low-density polyethylene, 15-25 parts maleic anhydride-grafted polyolefin, 10-20 parts POE, 10-15 parts phenolic resin, 5-10 parts tackifier, 2-4 parts talc, 1-3 parts coupling agent, 3-5 parts polyethylene wax, and 0.5-0.8 parts antioxidant. This invention involves preheating and bonding one side of the TPO waterproof layer and adhesive layer at 120-140°C; then pressing the metal plate onto the other side of the adhesive layer, performing hot-pressing bonding at 140-160°C, and cooling to room temperature to obtain the TPO waterproof metal fusion board.

The application discloses a kind of preparation methods of high-stability PE and EVA composite fabric in the technical field of fabric processing, including LLDPE, HDPE, POE elastomer, talcum powder as raw material preparation fiber network, with rutile TiO2, nano ZnO, fumed SiO2, silane coupling agent, salvinic acid as raw material preparation composite particles, with LDPE, EVA, POE elastomer, PE-g-MAH, composite particles, dispersing agent as raw material filling material, filling material is filled in fiber network, is shaped by hot pressing, calendering, cooling PE-EVA composite film is obtained, base cloth, TPU hot melt adhesive film and PE-EVA composite film are overlaid layer by layer, after hot pressing shaping, cooling, composite fabric is prepared.The high-stability PE and EVA composite fabric, by the PE-EVA composite film obtained on the surface of base cloth, realizes the promotion of the anti-ultraviolet, anti-yellowing performance and anti-friction damage effect of fabric, and comprehensively improves the stability and durability of PE and EVA composite fabric.

The invention discloses a cyanophenyl metal-based ultraviolet absorbent, a preparation method and application thereof, and a modified polyvinyl chloride material, and belongs to the technical field of ultraviolet absorbents. The preparation method of the cyanophenyl metal-based ultraviolet light absorber comprises the following steps: adding a cyanophenyl compound into a first organic solvent, adding a metal hydroxide, carrying out a heating reaction, and cooling to obtain a solid precipitate; and dissolving the solid precipitate in a second organic solvent to obtain the cyanophenyl metal-based ultraviolet light absorber. The invention also provides application of the cyanophenyl metal-based ultraviolet light absorber as a modified material. The invention also provides a modified polyvinyl chloride material which is prepared by the following steps: dissolving the polyvinyl chloride material and the cyanophenyl metal-based ultraviolet light absorber in an organic solvent, pouring, drying and washing to obtain the modified polyvinyl chloride material. The novel ultraviolet light absorber solves the problems that an existing polyvinyl chloride material is weak in ultraviolet resistance, easy to age and easy to decompose to generate harmful substances.

This invention relates to the field of preparation method technology and discloses a method for preparing a low-density nylon foam material. The method includes selecting nylon resin as the matrix material, wherein the nylon resin is a blend of PA6 and amorphous nylon PA610 in a specific ratio, wherein the mass ratio of PA6 to PA610 is 60:40 to 80:20, and the melt strength of the nylon resin is greater than or equal to 18 Pa·s; introducing a composite foaming agent, wherein the composite foaming agent is a combination of a chemical foaming agent and a physical foaming agent; and adding a nucleating agent, wherein the nucleating agent is nano-sized silica, nano-clay, talc, or a combination thereof, wherein the mass content of nano-silica is 0.5% to 2.0%. This invention can maintain stable dimensions and mechanical properties in humid environments and has a uniform and stable cell structure.

This invention discloses a method for preparing a transparent fire-retardant wood coating, belonging to the field of coating technology. The transparent fire-retardant wood coating includes an inner coating and an outer coating. The preparation method of the inner coating is as follows: a flexible flame retardant is dissolved in water, and tea polyphenol crystals are added to form a flame-retardant mixture; then, it is mixed evenly with an amino resin to obtain a transparent fire-retardant inner coating. The preparation method of the outer coating includes: first, preparing a sulfur-containing all-organic high-refractive-index polymer by catalytic polymerization of bromoalkanes and dithiophenol monomers using an organic base; then, dissolving the polymer in a transparent organic solvent to obtain a high-refractive-index polymer solution; grinding ammonium polyphosphate and pentaerythritol and mixing them evenly with a polysiloxane emulsion to obtain a fire-retardant mixture; finally, adding the high-refractive-index polymer solution, a film-forming aid, and an amino resin to the fire-retardant mixture to obtain a transparent fire-retardant outer coating. This invention achieves good UV resistance in addition to transparency and fire resistance.

The application discloses an anti-ultraviolet LCP material and a preparation method thereof, and belongs to the technical field of anti-ultraviolet high polymer material preparation. LCP resin, ultraviolet absorber, light stabilizer, zinc acetate and benzoic acid are added into a reaction container, and after being uniformly mixed, benzoyl peroxide is added and stirred, the temperature is raised to 120-150 DEG C under a nitrogen atmosphere, and the reaction is kept for 40-90 min; the temperature is continuously raised to 200-240 DEG C, and the reaction is kept for 20-40 min, then the temperature is raised to 280-310 DEG C, and the reaction is kept for 2-3 h, and the LCP double-grafting composite anti-ultraviolet additive is obtained after the reaction is completed; the LCP double-grafting composite anti-ultraviolet additive is mixed with LCP resin and antioxidant, and is blended, extruded and granulated by using a double-screw extruder, so that the anti-ultraviolet LCP material is obtained. The ultraviolet absorber is grafted on the LCP molecule through free radical grafting and esterification reaction, the grafting rate is improved, the anti-ultraviolet effect is coordinated with the light stabilizer and the antioxidant, and the ultraviolet light aging is inhibited.

The invention relates to a thermoplastic plastic coated glass fiber reinforced plastic composite pipe and a preparation method thereof. The composite pipe comprises the following raw materials: modified polyethylene, nano aluminum oxide, styrene, dihydroxydiphenylmethane, a benzotriazole compound, dioctyl phthalate and the like, wherein the modified polyethylene is synergistically modified by introducing a double-dynamic cross-linked structure and a multifunctional copolymer; the self-repairing function, the high temperature resistance, the ultraviolet resistance and the intelligent response characteristic are realized. The preparation method of the modified polyethylene comprises the steps of melt blending, cross-linking reaction, copolymerization reaction and toughening treatment, and the mechanical property and durability of the thermoplastic plastic coated glass fiber reinforced plastic composite pipe can be remarkably improved. Through an extrusion molding process, the finally obtained composite pipe has excellent ultraviolet resistance, high temperature resistance, wear resistance and self-repairing performance, and is suitable for pipeline protection in a severe environment.

This invention relates to a room-temperature self-crosslinking silicone-modified polyurethane sealant and its preparation and application methods. First, a silicone-modified polyurethane polymer is prepared. By controlling the ratio of silicone monomers to polyurethane raw materials, a room-temperature self-crosslinking polymer sealant with excellent sealing properties, adhesion, and mechanical strength is prepared. Then, the synthesized polymer sealant is coated onto a cover glass using a spin-coating device. The glass is then placed on the surface of a solar photovoltaic device, and the solar photovoltaic cell is encapsulated through rapid crosslinking and curing of the silicone-modified polyurethane resin at room temperature. This silicone-modified polyurethane encapsulant is transparent, resistant to moisture and heat, and has high toughness, meeting the requirements of high-quality and rapid production of solar photovoltaic devices, improving their service life, and is very suitable for the encapsulation process of commercial photovoltaic devices.