123results about How to "Improve thermal performance" patented technology

The invention discloses light gray low-emissivity coated glass for near-zero energy consumption buildings and a preparation method thereof, the light gray low-emissivity coated glass comprises a glass substrate and a composite metal film layer laminated on the glass substrate, and is coated glass with three metal silver film layers. According to the invention, one of the multiple composite metal film layers on the common colorless transparent float glass substrate reflects and interferes with light, so that the coated glass is light gray in the sun and has good decoration and energy-saving effects; the hollow glass is high in visible light transmittance, low in outdoor visible light reflectivity, low in solar energy transmittance and high in solar energy reflectivity, and can be made into hollow glass to achieve better energy-saving effects such as light control, heat insulation and the like, so that a building is closer to the nature and is fused with the nature.

The invention discloses a low-loss resin composition, which is prepared from the following main components in parts by weight: 10 to 90 parts of acenaphthylene-p-vinylbiphenyl copolymer, 10 to 70 parts of cross-linking agent, 20 to 60 parts of elastomer, 0.1 to 3 parts of initiator and 10 to 90 parts of filler. The acenaphthylene-p-vinylbiphenyl copolymer is obtained by pre-polymerizing acenaphthylene and divinylbiphenyl, the acenaphthylene monomer residue is less, the acenaphthylene monomer is difficult to volatilize in a resin system, implosion caused by too fast curing reaction of the resin system is prevented while good reaction activity is maintained, and a subsequent curing product is high in crosslinking density and good in heat resistance; a machining window is wide, and subsequent production and machining are facilitated; and an acenaphthylene structure has high symmetry and rigidity and does not contain elements such as oxygen, sulfur and nitrogen, so that the resin composition has excellent dielectric properties and thermal properties and a low thermal expansion coefficient, and an elastomer as a cross-linking curing matrix material can provide the characteristics of low dielectric constant, low dielectric loss, low water absorption and the like.

The invention discloses negative photosensitive polyamic acid, photosensitive resin and a preparation method and application of the negative photosensitive polyamic acid and the photosensitive resin. The negative photosensitive polyamic acid is prepared from diamine and a dianhydride compound as monomers through end capping of anhydride containing a norbornene group; the photosensitive resin is formed by mixing negative photosensitive polyamide acid, polythiol and a photoinitiator, and is applied to preparation of photoresist, photosensitive packaging adhesive, photocuring adhesive and the like; the photosensitive resin is subjected to ultraviolet curing and gradient imidization to prepare negative photosensitive polyimide cross-linked through polythiol, and the negative photosensitive polyimide has good thermal performance and photosensitive performance; the photosensitive resin is used for preparing photoresist and is a solution-developed negative photosensitive polyimide system, alkenyl of a polyamide acid terminal chain and sulfydryl of polythiol are subjected to a click reaction to construct a cross-linking point, the solubility of polyamide acid in an exposure area in an alkaline solution is reduced, a negative pattern is obtained, the preparation method is simple, and the cost is low. The pattern resolution and sensitivity are high, and the method is expected to be well applied to the fields of optics and electronics.

The invention provides a design method of a variable-size variable-density lattice structure wing with optimized heat dissipation load, and relates to the technical field of aerospace engineering, and the design method comprises the following steps: S10: carrying out variable cross-section design on a D-type unit to obtain a variable cross-section D-type unit, taking the variable cross-section D-type unit as a lattice unit configuration, and filling the wing to form a skin lattice structure; the skin lattice structure of the wing comprises a skin and a lattice filling area; s20, cell element variable-size design is adopted for the dot matrix units, and variable-size dot matrix units are constructed; s30, according to the stress field of the wing, cell element variable-density design is adopted for the variable-size dot matrix units, and variable-size variable-density dot matrix units are constructed; and S40, establishing a wing configuration. The variable-cross-section D-type unit is used as a dot matrix unit configuration, deep coupling of integrated design of heat dissipation and bearing performance is achieved through variable-size and variable-density design, application scenes are flexibly adjusted, and complex working condition requirements are met.

The invention relates to a nanocellulose-silicon-based hybrid material, preparation and application thereof and a thermoplastic polymer composite material. Comprising the following steps: combining nano SiO2 containing hydrophilic hydroxyl on the surface with hydroxyl on the surface of cellulose, then adding a silane coupling agent, reacting and hydrolyzing the silane coupling agent to obtain silanol, combining the silanol with hydroxyl on the surface of nano SiO2 particles and hydroxyl on the surface of nano cellulose, drying, dehydrating the silanol into siloxane, and grafting the siloxane on the surface of nano cellulose / SiO2, thereby obtaining the nano SiO2 / silanol composite material. Grinding to obtain a nanocellulose-silicon-based hybrid material, blending the obtained hybrid material with a thermoplastic polymer matrix, and preparing a corresponding product through a thermal forming process. The process is environment-friendly, the method is simple, the product is easy to form, operation and control are simple and convenient, and industrial production is facilitated; the prepared hybrid material has good stability, dispersibility and polymer matrix compatibility, and shows excellent mechanical properties and thermal properties when applied to thermoplastic polymers.

The invention discloses a method for improving the comprehensive performance of a PLA / PBS blended material by using a compatilizer, and belongs to a preparation method of a biodegradable material. The method comprises the following steps: adding a PLA / PBS blending system into a twin-screw extruder according to a certain mass ratio for melt blending, and adding a compatilizer, an antioxidant and an initiator to improve the compatibility between PLA and PBS. Epoxy groups in the compatilizer can chemically react with hydroxyl groups in PLA and PBS to form chemical bonding, so that the mechanical property and the optical property of the material are remarkably improved. The prepared composite material has excellent mechanical, processing and optical properties, and the preparation process is simple and convenient to operate. The innovative technology is very suitable for large-scale industrial production, has remarkable economic benefits and wide application prospects, and provides a new technical route for promoting the development of the field of biodegradable materials.

The invention provides a PBO (poly (p-phenylene benzobisoxazole)) coated diaphragm for a lithium ion battery and a preparation method of the PBO coated diaphragm. The PBO coated diaphragm comprises a lithium ion battery diaphragm substrate and a PBO (poly (p-phenylene benzobisoxazole)) pulp layer coated on the substrate. According to the coating layer, the thermal stability, the mechanical strength and the chemical stability of the lithium ion battery diaphragm can be remarkably improved, so that the comprehensive performance and the safety of a lithium ion battery are improved, and the coating method is simple, easy to implement, low in cost and suitable for large-scale production.

The invention discloses a fluoride modified liquid metal medium thermite and a preparation method thereof, and belongs to the technical field of thermite preparation. Liquid metal is prepared by using Gallinstan eutectic; the method comprises the following steps: synthesizing aluminum powder and liquid metal by adopting a physical mixing and ultrasonic treatment method to obtain liquid metal modified aluminum; the preparation method comprises the following steps: adding FeCl3. 6H2O into a perfluorooctanoic acid aqueous solution, stirring and mixing, carrying out hydrothermal reaction, and washing the obtained product to obtain Fe (PFO) 3; the method comprises the following steps: mixing liquid metal modified aluminum with iron perfluorooctanoate, and carrying out ultrasonic treatment to obtain Fe (PFO) 3-coated LM-Al; fe (PFO) 3 (at) LM-Al and ferric oxide are added into absolute ethyl alcohol for ultrasonic stirring and mixing, and Fe (PFO) 3 (at) LM-Al (at) Fe2O3 is prepared. By the adoption of the method, the high-temperature thermal oxidation reaction temperature of the aluminum powder is increased to be before the melting point of 660 DEG C, and the breakthrough progress of the aluminum powder thermal mass transfer process is achieved.

The invention relates to an efficient heat shrink tube preparation method and equipment thereof. FEP granules and modified CaSi2 are fed into an extruder to be extruded, and an FEP pipe is obtained; placing the FEP pipe in an expansion box, taking out the FEP pipe after the pressure in the FEP pipe and the pressure in the expansion box reach expansion pressure and are stabilized for a period of time and the pressure and the temperature in the expansion box and the FEP pipe are reduced to normal pressure and low-temperature oil temperature, and respectively washing the inside and the outside of the FEP pipe with water until the product meets the use requirement; the modified CaSi2 is prepared by the following steps: reacting CaSi2 powder, DMF (Dimethyl Formamide), isocyanatopropyltriethoxysilane, 4-hydroxyphenylboronic acid pinacol ester, lanthanum 5-hydroxyisophthalate, organic tin and methylbenzene, washing, carrying out suction filtration, and drying, thereby obtaining the modified CaSi2. The lanthanum 5-hydroxyisophthalate disclosed by the invention is prepared from 5-hydroxyisophthalic acid and lanthanum nitrate; the heat-shrinkable tube prepared by the invention has a relatively high heat shrinkage ratio.

The invention discloses a method for preparing a high-performance closed-cell perlite material by a chemical method, the prepared high-performance closed-cell perlite material is mainly used in the field of buildings, and the method comprises the following steps: S1, expanding; s2, film covering; s3, dispersing; s4, grading; according to the invention, a layer of silica sol film is formed on the surface of the closed-cell perlite, the film layer not only significantly reduces the volume shrinkage of the closed-cell perlite in the subsequent slurry stirring process, but also effectively hinders the expansion of cracks in the perlite and greatly reduces the cracking risk, and meanwhile, the heat conductivity coefficient of the material is also reduced by film coating treatment, so that the thermal conductivity of the material is improved. The thermal insulation performance is obviously improved; according to the drying furnace, through cooperative use of the drying mechanism and the adjusting mechanism, the air outlet pipe can be driven to swing up and down in a reciprocating mode, so that the air blowing angle of the air outlet pipe is adjusted according to use requirements, hot air can be blown to different areas in the furnace body, the air blowing range is widened, and the perlite drying effect is improved.

The invention relates to the technical field of PE wrapping films, in particular to a multi-layer co-extrusion PE stretching wrapping film which overcomes the defects in the prior art and comprises the following components: polyethylene, polyhedral oligomeric silsesquioxane, ethylene-vinyl acetate, bonding resin, polypropylene, nano zirconium oxide particles, polyether-ether-ketone, an antistatic agent, a slip agent and an ultraviolet absorbent. According to the invention, novel nano materials such as nano zirconium oxide and polyhedral oligomeric silsesquioxane are introduced, and a material formula and a preparation process are optimized, so that the multi-layer co-extrusion PE stretching and wrapping film with higher wear resistance, high temperature resistance, chemical resistance and mechanical strength is developed, and increasingly complicated and diversified market requirements are met.

The invention relates to a waterproof anti-cracking composite coiled material and a preparation method and application thereof. The composite coiled material comprises a paper base layer and a waterproof coating coated on the surface of the paper base layer, and the waterproof coating is formed by curing a waterproof finishing agent. The waterproof finishing agent comprises the following raw materials in parts by mass: 60-75 parts of epoxy resin, 2-5 parts of a hardening agent, 5-20 parts of rubber particles, 8-15 parts of modified bacterial cellulose, 20-30 parts of polylactic acid, 10-20 parts of polyethylene glycol and 5-10 parts of a silane coupling agent. The composite coiled material can serve as a decorative material to be attached to the surface of furniture, and due to the good flexibility, crack resistance and tensile effect, the technical problems that when traditional furniture decorative paper is attached, corners are prone to being bent and broken, and the waterproof performance is poor are solved.

The invention relates to the field of oil and gas gathering and transportation, in particular to a drag reducer for oil and gas gathering and transportation and a preparation method of the drag reducer, and solves the problems that poly-alpha-olefin drag reducers are insufficient in shear resistance, and nano drag reducers are unstable in drag reduction effect and poor in drag reduction effect. Dispersing graphene oxide in an alkaline solution, dropwise adding the dispersed graphene oxide into deionized water containing carboxymethyl cellulose, adding a catalyst, and carrying out a heating reaction to obtain a miniature elastomer; the preparation method comprises the following steps: preparing a micro elastomer, oxidizing the micro elastomer to form alkali liquor containing an activated nano material, modifying the activated nano material by using a polyphenol compound, and modifying a long-chain hydrophobic structure to obtain the hydrophobic drag reducer. The oil gas drag reducer prepared by compounding the graphene oxide and the cellulose and constructing a plurality of hydrophobic long chains is excellent in drag reduction effect and high in shear resistance.

The invention relates to modified epoxy resin and a preparation method thereof.The preparation method comprises the steps that S1, nano aluminum nitride and mesoporous silica are subjected to an ultrasonic reaction in an organic solvent, then a reaction product is sequentially subjected to centrifugal separation, filtering, washing and drying, and a precursor AlN-coated SiO2 is obtained; s2, the precursor AlN-coated SiO2 and epoxy resin are mixed and then heated to a molten state, heat preservation is conducted in the molten state, modified epoxy resin is obtained, and the modified epoxy resin is used as a heat conduction epoxy plastic packaging material for semiconductor structure packaging. Nanometer aluminum nitride and mesoporous silica are subjected to an ultrasonic reaction to obtain a precursor AlN-coated SiO2, and the precursor AlN-coated SiO2 is doped with epoxy resin, so that the heat-conducting property of the modified epoxy resin is remarkably enhanced, the modified epoxy resin can provide an additional heat dissipation way when being applied to semiconductor structure packaging, the requirement of electronic packaging for a high-heat-conducting packaging material is met, and the service life of the high-heat-conducting packaging material is prolonged. Meanwhile, the modified epoxy resin has good thermal property and mechanical property.

The invention relates to the technical field of organic polymer materials and the technical field of lithium batteries, in particular to polyimide and a preparation method and application thereof.The preparation method of the polyimide comprises the steps that in the inert gas atmosphere, a first solvent, a first monomer and a second monomer are subjected to a mixed reaction, pyridine and acetic anhydride are added, a reflux reaction is conducted, cooling is conducted, and the polyimide is obtained. And adding a second solvent, stirring, carrying out suction filtration, and drying. The polyimide is resistant to high temperature, the decomposition temperature is 500 DEG C or above, and the polyimide has good thermal performance, meanwhile, when the polyimide is applied to preparation of the lithium ion battery diaphragm in the form of nanofibers and nanoparticles, due to the fact that the polyimide has cohesiveness, the problem that the cohesiveness of a binder fails is solved, and due to the fact that the polyimide contains ether bonds and has higher affinity with electrolyte, the service life of the polyimide is prolonged. The wettability of the battery is improved; meanwhile, the polyimide is simple in preparation method, suitable for mass production and convenient for commercialized popularization.

The utility model relates to the technical field of boilers, in particular to a boiler shell boiler with smoke tubes welded with a boiler shell, which comprises a boiler body, a boiler furnace arranged on the lower portion inside the boiler body, a corrugated structure of the outer wall of the boiler furnace, a reversal chamber connected to one end of the boiler furnace, and a plurality of threaded smoke tubes arranged on the upper portion inside the boiler body. A front tube plate and a rear tube plate are installed at one end of the threaded smoke tube, the two ends of the threaded smoke tube are welded to the front tube plate and the rear tube plate respectively, and diagonal draw bars are installed in the boiler body and close to the upper portions of the two ends. According to the boiler shell boiler with the smoke pipe and the boiler shell welded, through structural optimization and innovative design of the boiler furnace and the smoke pipe, the heat efficiency and performance of the boiler shell boiler are remarkably improved. The furnace pipe of the corrugated structure increases the heating area and promotes sufficient combustion of fuel, and therefore the heat energy utilization rate is improved. Meanwhile, due to the design of the threaded smoke pipes, the smoke generates a strong vortex effect in the flowing process, heat exchange between the smoke and the inner wall of the boiler shell is enhanced, and the heat energy transfer effect is further improved.

The invention provides a diamond thick film and a preparation method thereof, and the preparation method comprises the following steps: (1) electrifying and heating the surface of a substrate by using a hot filament, introducing a methane and hydrogen mixed gas with the methane volume content of 2-8%, and depositing diamond on the surface of the substrate; (2) after the single deposition thickness of the diamond reaches 50-150 microns, stopping introducing the methane, and maintaining for 0.5-20 hours in a hydrogen atmosphere; (3) introducing a methane and hydrogen mixed gas with the methane volume content of 2-8%, and continuously depositing the diamond; (4) after the single deposition thickness of the diamond reaches 50-150 microns, stopping introducing the methane, and maintaining for 0.5-20 hours in the hydrogen atmosphere; and (5) according to the required thickness of the diamond thick film, the step (3) and the step (4) are repeated, the diamond thick film is obtained, and the thickness is 600-2500 microns. According to the method, the diamond phase content in the diamond thick film is increased, and the mechanical and thermal properties of the diamond thick film are improved.

The invention relates to the technical field of photoelectric devices, in particular to a perovskite thin film and a preparation method thereof, a perovskite precursor solution, a photoelectric device and an electric device. According to the perovskite thin film provided by the invention, the perovskite thin film comprises an ABX3 type perovskite material and a cross-linked polymer, and the cross-linked polymer is a polymer obtained by cross-linking an ether-containing amide monomer. The cross-linked polymer contained in the perovskite thin film provided by the invention can effectively passivate surface defects of the perovskite thin film so as to improve thermal stability and photoelectric properties of the perovskite thin film.

The invention relates to a preparation process of a modified PPC biodegradable plastic, and belongs to the technical field of bioplastics, the modified PPC biodegradable plastic comprises the following raw materials: 60-80 parts of PPC resin, 20-30 parts of a modified reinforcing material, 0.5-1 part of an antioxidant, 0.4-0.6 part of a plasticizer and 0.5-0.8 part of a lubricant; according to the technical scheme, after cellulose is grafted with amino silane, the amino silane is combined with the aldehyde group compound to obtain the reinforcing material, and the amino silane is combined with the aldehyde group compound to form a Schiff base structure; combining epoxidized castor oil with a reinforcing material to obtain a modified reinforcing material; the modified PPC biodegradable plastic is obtained by mixing the PPC resin, the modified reinforcing material, the antioxidant, the plasticizer and the lubricant, carrying out melt blending and then carrying out extrusion granulation, so that the thermal property, the mechanical property and the flame retardant property of the PPC biodegradable plastic are totally improved, the comprehensive performance of the PPC biodegradable plastic is improved, and the pollution to the environment is reduced.

The invention relates to the technical field of copper-clad plates, in particular to a benzoxazine-epoxy resin glue solution, a copper-clad plate and a preparation method. The benzoxazine-epoxy resin glue solution is prepared from the following components in parts by weight: 80 to 120 parts of modified flame-retardant epoxy resin, 20 to 40 parts of aromatic main chain benzoxazine, 20 to 40 parts of fat main chain benzoxazine, 20 to 40 parts of metal hydroxide, 0.4 to 0.6 part of curing agent and 70 to 80 parts of composite solvent. The modified flame-retardant epoxy resin serves as a flame retardant, the flame retardance of the epoxy resin is improved, in the curing process of the epoxy resin, no by-product small molecules are generated, defects are reduced, and the mechanical property of the obtained copper-clad plate is improved; due to the addition of the aromatic main chain benzoxazine, Tg is increased, and dielectric loss is reduced; due to the addition of the fat type main chain benzoxazine, the processing performance and the thermal performance of the material are improved. The copper-clad plate has application prospects in microwave communication, aerospace and printed circuit boards.

The invention provides polyimide slurry for a flexible display substrate, a preparation method of the polyimide slurry and a preparation method of a polyimide film. The polyimide slurry comprises the following raw materials: diamine, dianhydride, an end-capping reagent, a solvent and an additive, the preparation method comprises the following steps: uniformly coating a SiOx inorganic layer substrate with slurry by adopting a slit coating device, carrying out HVCD and high-temperature imidization baking, standing in a high-humidity environment for 8 hours, and slowly stripping a PI film material by virtue of film stripping equipment, so as to obtain the light yellow polyimide film. Through specific formula and process development and optimization of the preparation process, the adhesive force between the polyimide film and the SiOx inorganic layer is remarkably improved, the problem that a traditional polyimide film is prone to falling off is effectively solved, electrical performance faults caused when the polyimide film is used in flexible display equipment are avoided, and the service life of the flexible display equipment is prolonged. The prepared polyimide film not only has good adhesive force, but also keeps excellent optical performance, mechanical performance and thermal performance, and is suitable for a high-performance flexible display technology.

This application relates to the field of polymer materials technology, providing a PET elastomer, composite material, dynamic covalent network polymer, and its preparation method and application. The elastomer is prepared by in-situ self-assembly of crown ether-primary amide dual-functionalized PET through melt blending. Its molecular network integrates a quasi-rotaxane supramolecular crosslinking network. This structure is formed by the host-guest interaction between the crown ether and the primary amide, and can act as a sliding crosslinking point to dissipate energy through the sliding of cyclic components. This application employs a two-step end-capping-in-situ self-assembly process to overcome the technical obstacles of low PET chain-end activity and poor compatibility between polyrotaxane and PET, achieving molecular-level dispersion of quasi-rotaxane in the PET matrix. This fully utilizes the molecular pulley effect to achieve breakthrough toughening of the elastomer. Simultaneously, it combines rigid nanofillers modified with aminosilane coupling agents to form a soft-hard synergistic network, enabling the PET composite material to maintain high toughness while simultaneously improving strength, modulus, and thermal properties.

The invention discloses a preparation method of a graphene copper-based composite material, and belongs to the technical field of copper-based composite materials. The method comprises the following steps: (1) carrying out surface pretreatment on a copper foil; (2) dropwise adding the graphene dispersion liquid on the surface of the copper foil, and drying the copper foil after the graphene dispersion liquid is freely diffused until the graphene dispersion liquid covers the surface of the copper foil; (3) stacking the copper foils in a manner that a graphene layer is arranged between two layers of copper foils, and then sequentially carrying out cold pressing and hot pressing to obtain a hot-pressed composite material; (4) annealing the hot-pressed composite material to obtain an annealed composite material; (5) carrying out cold rolling on the annealed composite material to obtain a rolled composite material; and (6) the rolled composite material is subjected to annealing treatment, and the graphene copper-based composite material is obtained. On the basis of simplifying the preparation process and reducing the preparation demand conditions, the graphene is promoted to effectively and fully exert the strengthening effect, and the comprehensive performance of the composite material in multiple aspects is improved.

The present invention discloses a biodegradable polyester amide with a side chain base having stereocomplex crystallization performance and an enzymatic preparation method thereof. The method uses D- or L-glutamic acid / aspartic acid derivatives as starting materials, and prepares a polymerization monomer containing a side chain base through a series of derivatization reactions. The polymerization monomer obtains a polyester amide with an optically pure side chain base under the catalysis of a protease. Such D- and L-configured polyester amides can form a D- / L-layer alternating stereocomplex structure through specific recognition of side chain bases under certain conditions to achieve stereocomplex crystallization of the polymer. Compared with polyester amides of a single configuration, the melting point of polyester amides with a stereocomplex structure is increased. The preparation method of the biodegradable polyester amide of the present invention uses naturally abundant amino acid derivatives as starting materials, and improves the thermal properties of the obtained polymer through a stereocomplex crystallization method, providing a new perspective for solving "white pollution".

The invention relates to a self-adaption-based thermally induced solid dimming material as well as a preparation method and application thereof. The dimming material is prepared from the following components in percentage by weight: 75 to 85 percent of octadecyl acrylate and 0 to 7 percent of allyl methacrylate. The thermotropic solid dimming material is used for preparing a self-adaptive thermochromic PVB (Polyvinyl Butyral) film. According to the invention, the powder material is embedded into the transparent resin, so that the temperature-sensitive characteristic of the film is enhanced, and the octadecyl acrylate monomer is used in emulsion polymerization, so that a thermotropic solid-state dimming material capable of changing color in a thermal response manner can be generated. A certain content of octadecyl acrylate in polymer synthesis enables the thermotropic solid dimming material to change color at the highest temperature of 40.2 DEG C, and the visible light transmittance exceeds 90%. In addition, by changing the content of allyl methacrylate, the discoloration temperature of the film can be finely adjusted in the range of 24.5 DEG C to 39.5 DEG C.

The invention provides an adhesive for filling an electric blanket junction box. The adhesive is prepared from the following raw materials in parts by weight: 70-80 parts of modified epoxy resin, 1-9 parts of a curing agent, 1-2 parts of a defoaming agent, 0.5-3 parts of filler, 20-32 parts of a coalescing agent, 0.5-2 parts of an adhesive retaining agent and 0.5-2 parts of a dispersing agent, the preparation method comprises the following steps: 1, stirring modified epoxy resin, a defoaming agent, a glue retaining agent and a dispersing agent in vacuum at 60 DEG C to obtain a mixture A; 2, mixing the curing agent, the filler and the coalescing agent to obtain a mixture B; and 3, mixing the mixture A and the mixture B at 90 DEG C for 20 minutes, uniformly stirring, and defoaming to obtain the filling adhesive. According to the filling adhesive disclosed by the invention, more light energy is concentrated, so that the collision opportunity of epoxy resin molecules is increased during curing, the light curing time is shortened, the crosslinking density of epoxy resin is increased, and the light curing depth is increased.

The application discloses a plant-based water-based adhesive and a preparation method thereof, and relates to the technical field of water-based adhesives. When the plant-based water-based adhesive is prepared, 2,4-dihydroxybenzophenone and acryloyl chloride are reacted to obtain an acrylate-based benzophenone; the silicon dioxide treated by a silane coupling agent is reacted with the acrylate-based benzophenone to obtain modified silicon dioxide; 4-methylumbelliferone is sequentially reacted with hexamethylene diisocyanate and 2-amino-2-methyl-1,3-propanediol to obtain an umbelliferone diol; castor oil, polybutylene adipate, the umbelliferone diol, dimethylol propionic acid and isophorone diisocyanate are copolymerized, neutralized by triethylamine and emulsified by deionized water to obtain a polyurethane emulsion; and the polyurethane emulsion and the modified silicon dioxide are mixed to obtain the plant-based water-based adhesive. The plant-based water-based adhesive provided by the application has excellent mechanical properties and weather resistance.

A trapezoidal fog dispersal module relates to the technical field of cooling tower appliances and comprises a plurality of inverted trapezoidal fog dispersal modules arranged in a tower side by side along the horizontal direction, hot channels are formed between adjacent trapezoidal fog dispersal side walls, the lower end part of each trapezoidal fog dispersal module is connected with a cold channel, and the hot channels and the cold channels are alternately arranged. The cooling tower solves the problems that in the prior art, a fog dissipation module in the cooling tower is limited by the structure of the fog dissipation module, so that the contact area between the fog dissipation module and hot air is small, and the heat exchange effect and the fog dissipation effect are poor.

This invention relates to a photocurable polymer composition for 3D printers, comprising a UV-curable polyurethane oligomer, a photoinitiator, a silane coupling agent, oligomers, and a stabilizer. According to the aforementioned photocurable polymer composition for 3D printers, 3D printed outputs with excellent physical properties such as thermal properties, strength, elastic modulus, and elongation can be manufactured, and 3D printed outputs that can restore their original shape even if deformed through use.

This invention relates to the field of polymer materials technology, and more particularly to a hydroxyl-terminated polyarylene ether and its preparation method. The preparation method of the hydroxyl-terminated polyarylene ether of this invention includes: preparing a monomer solution containing 2,6-dimethylphenol and tetramethylbisphenol; polymerizing the monomer solution with an oxidant; adding a chelating agent aqueous solution to quench the polymerization reaction after the polymerization is completed; washing the obtained hydroxyl-terminated polyarylene ether solution with the washing wastewater generated during the production of thermosetting capped polyarylene ethers; allowing it to stand; and separating the solutions to obtain the hydroxyl-terminated polyarylene ether. This invention's method for preparing hydroxyl-terminated polyarylene ethers utilizes a large amount of washing wastewater generated during the production of thermosetting capped polyarylene ethers to wash the hydroxyl-terminated polyarylene ethers, which can effectively remove amine substances, save wastewater treatment steps, achieve resource utilization, and improve the thermal properties of the hydroxyl-terminated polyarylene ethers.