55results about How to "Improve barrier properties" patented technology

This invention discloses a weather-resistant, high-hardness composite anti-corrosion coating and its preparation method, belonging to the field of anti-corrosion coating technology. The preparation method includes: firstly, synthesizing an epoxy resin containing dynamic disulfide bonds by reacting dithiodibenzoic acid and epichlorohydrin in an alkaline aqueous phase; secondly, constructing a low surface energy siloxane network using hydroxyl-terminated polydimethylsiloxane and methyltriethoxysilane; subsequently, introducing chlorzoxazone and N-acetyl-p-aminophenol as composite organic corrosion inhibitors, blending them with the resin to obtain a composite base material; finally, adding graphene, carbon nanotubes, and inorganic anti-corrosion fillers, and cross-linking and curing to form a film using a polyamine curing agent. This invention suppresses microcracks through the dynamic stress relief of disulfide bonds, combined with the weather-resistant barrier of the siloxane network, the active interface passivation of the heteroatom corrosion inhibitor, and the three-dimensional synergistic mechanical bonding of carbon-based nanomaterials, achieving a perfect unity of ultra-strong corrosion resistance, excellent weather resistance, and high mechanical hardness in the coating.

This invention discloses an aqueous dispersion of a polyhydroxyalkanoate-grafted ethylene-acrylic acid copolymer with a self-emulsifying core-shell structure, its preparation method, and its recyclable paper packaging, belonging to the field of reactive modification of polymer materials and green packaging technology. This invention employs in-situ reactive extrusion technology to construct stable microparticles with a hydrophobic polyhydroxyalkanoate core and a hydrophilic ethylene-acrylic acid copolymer salt as the shell, overcoming the industry challenge of poor compatibility of bio-based materials. The aqueous dispersion requires no external emulsifier, achieving the same excellent barrier and heat-sealing effects with a lower coating weight, significantly reducing usage costs. Its unique alkali-induced swelling mechanism endows the coating with intelligent peeling properties, achieving efficient separation of the coating and fiber during resizing, greatly improving the purity of recycled fibers.

The present application relates to the technical field of new energy power battery thermal management materials, in particular to a co-extrusion film material for aerogel thermal insulation pad packaging, and discloses a co-extrusion film, a preparation process and application in new energy batteries, wherein the co-extrusion film is prepared from high-performance master batches through a co-extrusion blow molding process, the high-performance master batches are composed of seven-vinyl POSS single-grafted nylon 6 resin, modified expanded vermiculite with octadecenyl and DOPO groups on the surface, and dicumyl peroxide initiator, under the action of the dicumyl peroxide initiator, the vinyl on the POSS cage structure of the seven-vinyl POSS single-grafted nylon 6 resin and the octadecenyl on the surface of the modified expanded vermiculite occur free radical reaction to obtain the high-performance master batches. Through the synergistic modification strategy of double grafting and crosslinking, the present application realizes the synergistic improvement of flame retardation, heat resistance, barrier property and mechanical property, and solves the technical bottlenecks of aerogel packaging materials in high-temperature failure, weak interface bonding and processing performance deterioration.

The invention relates to the technical field of electrochromic materials and glass preparation, in particular to a preparation method of sandwich type all-solid-state inorganic electrochromic glass which is formed by sequentially compounding a tempered glass layer, a film layer and an electrochromic film layer pile. The thickness of the tempered glass layer is 4 mm, and the film layer is a PVB film and is 0.76 mm thick. The electrochromic film layer stack takes sodium-calcium non-tempered glass with the thickness of 3mm as a substrate, and an anti-ion diffusion layer, a first conductive layer, a first resistive layer, a negative electrode color changing layer, a second resistive layer, a positive electrode color changing layer, a third resistive layer, a second conductive layer and an outermost protective layer are sequentially arranged on the surface of the substrate from inside to outside; the anti-ion diffusion layer is a silicon dioxide layer, and the thickness is 200 nm. According to the preparation method of the sandwich type all-solid-state inorganic electrochromic glass provided by the invention, through precise design of each film layer structure of the glass and gradient optimization of a preparation process, the comprehensive performance of a product is synergistically improved, and many problems in the prior art are effectively solved.

This utility model discloses a lightweight coated grille, relating to the field of automotive grille technology. It includes a metal mesh substrate, with a composite coating applied to the outer side of the metal mesh substrate. The composite coating is sequentially configured as a primer layer, a core layer, a transition layer, and a top layer. The primer layer comprises a conversion layer and a protective layer, with the inner side of the conversion layer and the outer side of the protective layer contacting the outer side of the metal mesh substrate and the inner side of the core layer, respectively. The conversion layer is a nano-zirconium-based conversion agent coating, the protective layer is a graphene-containing epoxy zinc-rich primer coating, and the core layer is a hollow ceramic microparticle-modified polyurethane coating. The outer side of the core layer contacts the inner side of the transition layer, and the outer side of the transition layer contacts the inner side of the top layer. This lightweight coated grille, based on an aluminum / magnesium alloy substrate and a multi-layer synergistic coating design, achieves comprehensive performance improvements in long-term corrosion resistance, environmental tolerance, thermal and acoustic management, and surface self-maintenance while maintaining extreme lightweight properties.

The application belongs to the technical field of bio-based packaging materials, and particularly relates to a novel double-layer composite film and application thereof. The novel double-layer composite film comprises the following steps: reacting palmitic anhydride and carboxymethyl cellulose to obtain carboxymethyl cellulose palmitate; adding a pH-sensitive natural dye indicator to obtain carboxymethyl cellulose palmitate nanoemulsion containing a pH-sensitive substance; then loading a natural polymer material to prepare a film material; finally adding the film material to the carboxymethyl cellulose palmitate to prepare a composite film, thereby obtaining the novel double-layer composite film. The double-layer composite film can be self-emulsified without adding a surfactant, and has the ability to load functional indicator (pH-sensitive color indicator) substances; meanwhile, the barrier performance of the film material, such as a chitosan film, to water vapor and oxygen is improved, and the double-layer composite film has a very promising application in food or fruit preservation. The method provided by the application is not only green in raw materials, but also uses a flow casting method, which can be applied to industrial production and has a good application prospect.

The application provides a high-barrier PBAT-based biodegradable film and a preparation method thereof. The preparation method comprises the following steps: melt blending a powdered high-barrier biodegradable polyester and PBAT to obtain a blend and performing film blowing to obtain the high-barrier PBAT-based biodegradable film; wherein the temperature of melt blending is lower than the melting temperature of the high-barrier biodegradable polyester and higher than the melting temperature of the PBAT; during the film blowing process, the temperature of the melt conveying zone is lower than the melting temperature of the high-barrier biodegradable polyester and higher than the melting temperature of the PBAT; and the temperature of the die lip zone is higher than the melting temperature of the high-barrier biodegradable polyester. The preparation method can prepare the PBAT-based biodegradable film with good barrier performance under the condition of a lower content of the high-barrier biodegradable polyester.

This invention relates to the field of lithium battery packaging materials technology, and discloses a flexible packaging film for battery cells and its preparation process. The flexible packaging film comprises a protective outer layer, a first adhesive layer, an aluminum foil layer, a second adhesive layer, and a heat-sealing inner layer stacked sequentially, wherein a corrosion-resistant bonding layer is disposed between the aluminum foil layer and the second adhesive layer. The corrosion-resistant bonding layer is formed by curing and cross-linking a coating liquid containing a surface-functionalized graphene oxide-supported nano-layered zirconium phosphate composite on the surface of the aluminum foil. The heat-sealing inner layer is a multilayer co-extruded functional polypropylene film layer comprising an adhesive transition layer, a support layer, and a heat-sealing layer. By constructing a corrosion-resistant bonding layer at the aluminum foil interface and optimizing the multilayer structural design of the heat-sealing inner layer, the stability of the aluminum-plastic composite interface, the heat-sealing reliability, and the overall mechanical compatibility can be improved, thereby improving the comprehensive performance of the flexible packaging film for battery cells under high temperature, high humidity, and electrolyte contact conditions, making it suitable for the packaging of power batteries and energy storage batteries.

The present application relates to the technical field of chemical product processing, in particular to a low-gloss polyacrylate resin composition, a preparation method and application thereof, which comprises a modified polyacrylate resin solution, an epoxy-siloxane modifier, a vinyl trimethoxysilane oligomer, an organic metal catalyst, a viscosity regulator and a polymerization inhibitor; the ester bond in the modified polyacrylate resin is fixedly protected by the epoxy-siloxane modifier, and the ability of the epoxy-siloxane modifier is further enhanced by the vinyl trimethoxysilane oligomer, so that the problem that the gloss of the extinction type polyacrylate resin containing a bulky side group is irreversibly increased due to ester bond hydrolysis in a hot and humid environment is solved.

This invention relates to the field of tunnel disaster prevention and rescue technology, and in particular to a folding airbag device and its method of use for sealing off smoke from train fires in tunnels. The device includes a train consisting of a driver's cab and multiple carriages, and several identical folding airbag devices. These devices are arranged sequentially at intervals from the first to the last end of the carriages and are all fixed to the top of the carriages. In the event of a fire, the folding airbag device of this invention effectively seals off smoke, creating an effective isolation layer and increasing evacuation time for passengers in carriages that have not yet caught fire. It has the advantages of rapid response and high smoke blocking efficiency, effectively extending the available safe evacuation time for passengers in carriages that have not yet caught fire, reducing the harm of fire smoke to passengers, and improving the safety and reliability of trains in railway tunnel fire accidents.

The utility model discloses a voice lift calling device and voice lift calling system relates to elevator control technical field. The utility model discloses voice lift calling device includes the body panel, the body bottom box and the voice transceiver, the body panel is equipped with the sound collection area, the sound collection area is equipped with a plurality of sound collection channels, the sound collection channel is by the outer wall of body panel and inclines to the inner wall of body panel, is equipped with the sound collection cavity between the sound collection area and the voice transceiver, and the both ends of sound collection cavity are sound collection and the sound collection mouth respectively, the sound collection mouth is greater than the sound collection mouth, and the sound collection mouth is connected with the sound collection area, and the sound collection mouth is connected with the voice transceiver, and the waterproof breathable membrane is equipped between the sound collection mouth and the voice transceiver, the voice transceiver is equipped with offline speech recognition module, and the offline speech recognition module is built -in lift command word library. Adopt the utility model, and the sound collection performance is good, and the dustproof is good.

The invention discloses kaolin-graphene composite aqueous slurry and a preparation method thereof. The preparation method comprises the following steps: S1, proportioning and mixing: mixing kaolin and amorphous carbon powder to obtain a solid mixture; s2, conductive networking and forming: adding a conductive auxiliary agent into the solid mixture obtained in the step S1, uniformly mixing, and then tabletting or granulating the mixture to obtain a to-be-treated blank; s3, ultrafast carbon heat treatment: carrying out ultrafast carbon heat treatment on two ends of the to-be-treated blank obtained in the step S2 in a negative pressure environment to obtain a composite filler; and S4, wet dispersion pulping: adding the composite filler obtained in the step S3 into a water-phase dispersion medium, and carrying out high-speed shearing dispersion, so as to obtain the kaolin-graphene composite water-based slurry. The waterborne epoxy anticorrosive coating has the advantages that stable dispersion and constructability can be realized in a waterborne system, and a multi-scale layered shielding network is constructed in a coating film, so that the barrier property and durability of the waterborne epoxy anticorrosive coating are improved.

This invention provides a gas barrier laminate, which is a thinner film and can maintain excellent gas barrier and aroma retention properties even after vacuum packaging in high temperature and high humidity environments. This invention relates to a gas barrier laminate, characterized in that it comprises a plastic substrate (I) and a gas barrier layer (II) laminated on the plastic substrate, wherein the total thickness of the gas barrier laminate is less than 100 μm, (1) the plastic substrate (I) comprises a metal-containing layer, wherein the metal-containing layer comprises at least one of a metal and a metal compound and a resin component, (2) the total content of the metal and the metal compound in the metal-containing layer is 0.1 to 20% by mass, (3) the gas barrier layer (II) contains a polycarboxylic acid, (4) the metal-containing layer and the gas barrier layer are laminated in direct contact, and (5) the composite elastic modulus of the gas barrier layer (II) when the surface of the laminate is subjected to a cooking treatment at 120°C for 30 minutes is measured by nanoindentation method is 9.0 to 12.5 GPa.

This invention discloses an organo-bentonite flame retardant synergist and its preparation method, belonging to the field of flame retardant materials technology. The preparation method includes: preparing calcium-based bentonite into a slurry, adding sodium carbonate for sodium purification; subjecting the purified slurry to high-pressure homogenization and flake removal; adding an organic modifier composed of octadecyl quaternary ammonium salt and dioctadecyl quaternary ammonium salt to the flaked slurry for intercalation modification, drying and dispersing; and adding end-functionalized polysiloxane to the organo-bentonite powder for surface coating treatment, thus obtaining the final product. The organo-bentonite flame retardant synergist prepared by this invention has a nanoscale layered structure and excellent compatibility with polyolefin matrices. When this synergist is combined with aluminum hydroxide for use in polyolefin composites, it can reduce processing torque, increase tensile strength, improve the limiting oxygen index to achieve UL-94V-0 rating, and simultaneously promote the formation of a continuous and dense expanded char layer, effectively inhibiting dripping.

This invention discloses a battery pack structure, relating to the field of battery pack heat dissipation technology. It includes a lower temperature equalization unit and an upper dual-mode heat dissipation unit. The lower temperature equalization unit includes a housing containing battery cells filled with an insulating and thermally conductive immersion liquid, ensuring complete immersion of the cells for uniform temperature distribution. The upper dual-mode heat dissipation unit includes a dual-cavity heat dissipation aluminum cover sealed to the top of the housing. Its lower side is attached to the battery cell terminals and aluminum foil via an insulating and thermally conductive elastic pad, dissipating the most concentrated heat from the top via the shortest path. The dual-cavity heat dissipation aluminum cover integrates a liquid cooling channel and an air cooling channel located above it. This invention, through a thermodynamically optimized design of "bottom full immersion temperature equalization + top directional heat conduction," completely eliminates the temperature difference between the top and bottom of the battery cells. Combined with dual-mode switching of air cooling priority and liquid cooling backup, it significantly improves heat dissipation efficiency, battery cell temperature uniformity, safety, cycle life, and reduces energy consumption.

The present application relates to ion exchange membrane technical field, particularly to a kind of low swelling crosslinked poly (arylene-quininium salt) anion exchange membrane and preparation method thereof.Poly (arylene-quininium) polymer is dissolved in first organic solvent, and halogenated poly (arylene-alkylene) polymer is added as macromolecular ionization reagent, and quininium group in partially ionized poly (arylene-quininium) polymer is then added with excess small molecule ionization reagent to make quininium group completely ionized, to obtain crosslinked poly (arylene-quininium salt) polymer solution.The obtained crosslinked poly (arylene-quininium salt) polymer solution is added to first precipitant to obtain crosslinked poly (arylene-quininium salt) polymer powder, and it is dissolved in second organic solvent to obtain polymer solution, coated on homogeneous substrate or porous substrate, dried to obtain low swelling crosslinked poly (arylene-quininium salt) anion exchange membrane.The present application uses halogenated poly (arylene-alkylene) as macromolecular crosslinking agent to construct crosslinked network in poly (arylene-quininium salt) ion polymer, so that the obtained crosslinked poly (arylene-quininium salt) anion exchange membrane shows low swelling, high mechanical strength, high alkali resistance and outstanding gas barrier property.

This invention belongs to the field of anti-corrosion coating technology and discloses a thin-layer high-barrier heavy-duty anti-corrosion coating and its preparation method. The coating comprises component A and component B, wherein component A is composed of fluorocarbon-polyurethane hybrid resin, glass flakes, cerium-doped carbon nitride, additives, and solvent, and component B is a curing agent and a diluent. The fluorocarbon-polyurethane hybrid resin is prepared by reacting fluorocarbon resin with a mixed isocyanate, which is a compound of aliphatic and aromatic isocyanates; the cerium-doped carbon nitride is obtained by calcining urea followed by secondary calcination with cerium ammonium nitrate. This invention, through resin hybrid design and synergistic use of functional fillers, achieves excellent acid and alkali corrosion resistance and long-term barrier effect under thin-layer conditions. The coating maintains surface integrity and stable adhesion even after immersion in corrosive media, and is easy to apply and low in cost, making it suitable for steel structure protection in harsh corrosive environments.

The utility model relates to the technical fields of core sample cutting machine discloses core sample cutting machine noise reduction energy -conserving green environmental protection structure, including the protective cover of cover setting in the outside of core sample cutting machine, and the protective cover has the protective cavity of accommodating core sample cutting machine in it, the protective cover has the protective wall, and the protective wall has the openwork area of inside and outside through arrangement, and the openwork area is covered with transparent window, the outside of protective wall has the outward side wall, and the inboard wall of protective wall has the inward side wall of arrangement towards protective cavity, and the inward side wall is covered with the sound insulation cotton layer, when the protective cover cover setting in the outside of core sample cutting machine, protective cavity is in sealed state, through the sound insulation cotton layer of protective cover, and make protective cavity be in sealed state, can significantly reduce the noise of core sample cutting machine work time generation, simultaneously, the sealed setting of protective cover can block dust and impurity to enter to guarantee the health of operator.

This invention relates to a composition, articles thereof, and a method for their preparation, and more particularly to a composition containing a polyhydroxyalkanoate, articles thereof, and a method for their preparation. The composition comprises a first component and a second component, wherein: the first component comprises a polyhydroxyalkanoate, the polyhydroxyalkanoate having the following repeating unit: in Formula I, n is 1, 2, or 3; R1 is hydrogen or a straight-chain or branched C1-C... 15 The first component contains an alkyl group, and the content of the polyhydroxyalkanoate is greater than 0 parts by weight and not more than 60 parts by weight; the second component contains a fatty acid or its salt having 12-36 carbon atoms, or a fatty alcohol or its derivative having 12-36 carbon atoms, and the content of the second component is at least 5 parts by weight. The composition can be used to prepare an aqueous polyhydroxyalkanoate dispersion with good film-forming properties.

The application provides a display panel and a display device, wherein the display panel comprises a display area and a non-display area, the non-display area is arranged around the periphery of the display area; the non-display area of the display panel comprises a substrate, a buffer layer arranged on one side of the substrate, a planar layer arranged on the side of the buffer layer away from the substrate, an inorganic encapsulation layer arranged on the side of the planar layer away from the buffer layer, and a touch insulation layer arranged on the side of the inorganic encapsulation layer away from the planar layer; wherein the buffer layer is provided with a convex area along a first direction, the convex area is located in the orthographic projection of the planar layer on the buffer layer; the first direction is the direction from the display area to the non-display area; the side of the buffer layer away from the convex area along the first direction is provided with an opening structure; the opening structure penetrates to the substrate along the thickness direction to deposit the inorganic encapsulation layer and the touch insulation layer.

The application provides a monomer containing a pyrrolidone ring, a degradable long-chain random copolyester and a preparation method. The copolyester has the structure shown in the following formula: wherein R1 comprises an ether bond or a thioether bond, R2 and R3 comprise a linear alkyl group containing 10-30 carbon atoms, x and y are both integers from 1 to 10, and m is an integer from 20 to 100. The degradable long-chain random copolyester provided by the application has a high molecular weight, excellent crystallinity, a high Young's modulus and water vapor gas barrier property, and good hydrolysis sensitivity, and the biodegradation rate can be controlled in a wide range, so that the copolyester can be widely applied to the preparation of agricultural mulching films, shopping bags and other products. Meanwhile, the preparation process is simple, easy to operate, the reaction conditions are mild, and the yield is high.

The application belongs to the field of marine corrosion protection and intelligent coating, and relates to an intelligent epoxy resin anticorrosive coating based on a dual-mode early warning and a preparation method. The coating is prepared by modifying epoxy resin (E44) and polypropylene glycol diglycidyl ether (PPGDGE) with 1,10-phenanthroline-5-amino (APhen), and then curing and cross-linking the two epoxy resin prepolymers with polyetheramine (D400) to obtain an epoxy resin anticorrosive coating with a pre-warning function. 2+ Due to the introduction of APhen, the prepared epoxy resin anticorrosive coating has fluorescence performance, can be complexed with Fe 2+ , and obvious visual coloration occurs. With the increase of the concentration of Fe , fluorescence quenching occurs. These two characteristics endow the system with a pre-warning function for local corrosion of a metal substrate. Meanwhile, the intelligent epoxy resin coating prepared based on the interpenetrating network has excellent mechanical properties and wide market prospects. The steps are simple, the operation is convenient, and the practicality is strong.

This invention provides a chitosan-based edible film with a nano-network structure, its preparation method, and its application. The preparation method includes the following steps: 1) Adding zein to water, adjusting the pH, and then adding a phosphorylation reagent to obtain a mixed solution. After dialysis, centrifugation is performed, and the supernatant is freeze-dried to obtain phosphorylated zein nanoparticles; 2) Adding microcrystalline cellulose to FeCl3·6H2O solution, heating in a water bath, vacuum filtering, washing the precipitate until white, and freeze-drying the obtained precipitate to obtain cellulose nanocrystals; 3) Preparing a coating solution: Adding the phosphorylated zein nanoparticles and cellulose nanocrystals to a chitosan hydrochloride solution to obtain a coating solution; 4) Adding a plasticizer to the coating solution, ultrasonically degassing, and then pouring the mixture onto an acrylic plate to naturally form a film, thus obtaining an edible film. The chitosan-based edible film prepared by this invention can be used to reduce cherry cracking when exposed to rain. It is safe and non-toxic and has high market value.

The utility model relates to an oil-gas-free efficient sealing structure which comprises a mechanical seal and a liquid filling seal which are arranged between a floating roof and a tank wall. The mechanical seal comprises a metal elastic plate, a barrier film and a supporting plate which are sequentially stacked. The right ends of the metal elastic plate, the barrier film and the supporting plate are fixedly arranged at the mounting point on the side part of the floating roof, and the left ends are tightly attached to the tank wall by virtue of the elasticity of the metal elastic plate; the liquid filling seal comprises an annular hanging belt which is installed on the side portion of the floating roof and located between the floating roof and the supporting plate, a liquid filling pipe body is arranged in an annular space between the hanging belt and the floating roof, and a liquid filling pipe is arranged on the liquid filling pipe body. The lower end of the liquid filling pipe extends into the liquid filling pipe body, the middle part is connected with the floating roof, and the upper end is provided with a liquid filling valve. The sealing device is simple in structure, convenient to operate, high in efficiency, good in sealing effect, small in oil gas loss and good in safety.

The utility model discloses a kind of high-temperature-resistant batteries, including positive plate, negative plate and the composite separator being set between positive, negative plate, it is characterized in that, the composite separator includes a group of PE separator, two groups of glass fiber separators and two groups of AGM separators, the utility model is placed in the two ends of composite separator by AGM separator with excellent liquid absorption, there is enough electrolyte around pole plate under the different working conditions of battery, glass fiber separator auxiliary electrolyte distribution, when cooperating with AGM separator, glass fiber separator can assist AGM separator to better adjust the distribution of electrolyte, prevent electrolyte excessive gathering or dry in local area, PE separator is placed in the middle, using its good barrier property, so that electrolyte maintains relatively stable distribution state inside battery, reduce acid stratification phenomenon, improve the service life and performance stability of battery.

The utility model relates to a kind of automobile front windshield.It involves new energy automobile technical field.The application specifically includes the outer glass plate and inner glass plate of parallel interval arrangement, and the interlayer cavity formed between outer glass plate and inner glass plate;It also includes light-absorbing structure arranged in interlayer cavity, and photosensitive structure arranged in interlayer cavity, and light-absorbing structure is used to adhere outer glass plate with the inner glass plate, and the strong light of outside shooting is absorbed, and photosensitive structure is used to detect the light intensity of outside shooting.The interlayer cavity formed between outer glass plate and inner glass plate of the utility model is equipped with light-absorbing structure and photosensitive structure, the strong light of outside shooting is absorbed by light-absorbing structure, and the light intensity of outside shooting is detected by photosensitive structure, the blocking effect of the automobile front windshield to strong light is improved, the interference of strong light to driver is reduced, and the law enforcement of road safety supervision department is assisted, so as to ensure driving safety.

The utility model provides a kind of organic silicon light-transmitting leather, organic silicon light-transmitting leather is used for attaching to target object, it includes 3D mesh material layer, base layer, light-transmitting organic silicon layer that are sequentially arranged, and pattern layer is set on light-transmitting organic silicon layer or base layer, pattern layer is set on the side of light-transmitting organic silicon layer or base layer close to target object, and the material of base layer is TPU or PET.In the utility model, transparent organic silicon layer and base layer both have the nature of light transmission, pattern layer can be formed into different patterns, and part of light can be blocked, so that different patterns can be observed by light from the outside.

This invention relates to a plastic conduit for conveying air conditioning refrigerant in electric vehicles or plug-in hybrid vehicles, the plastic conduit comprising two layers or only two layers: a first layer directly surrounding the internal space of the conduit, and a second layer directly adjacent to the first layer, wherein the first layer is based on an aliphatic polyamide molding compound A comprising PA 6, and the second layer is based on an aliphatic polyamide molding compound B comprising PA 610, PA 612, or mixtures thereof or copolyamides, wherein the sum of the thicknesses of the first and second layers is in the range of 1.5 mm to 5 mm, and the thickness ratio of the first to the second layer is in the range of 0.50 to 6.00.

This invention relates to a two-component sealant, its preparation method, and its application. The two-component sealant comprises component A and component B; component A comprises an amino resin; and component B comprises isocyanate curing agent X and isocyanate curing agent Y. The two-component sealant exhibits excellent water vapor barrier properties, and when applied to photovoltaic modules, it provides good water-proof protection for internal materials, thereby effectively extending the service life of the photovoltaic modules. Simultaneously, the two-component sealant also possesses high strength and good thermal stability.

The present disclosure provides a light-emitting unit and a manufacturing method thereof. The light-emitting unit comprises a circuit board, a light-emitting device and a protective layer; the light-emitting device is located on the circuit board and electrically connected with the circuit board; the protective layer covers the surface and the sidewall of the light-emitting device; the protective layer is a modified polycyclic resin layer, and the material of the modified polycyclic resin layer is a mixture of an epoxy resin, a curing agent, a modifier, a functional filler, an accelerator, a leveling agent and a defoaming agent.