63results about How to "Good water vapor barrier" patented technology

The present invention discloses a preparation method of a polyester chip for a solar battery back film. A polyester chip semi-finished product with intrinsic viscosity of 0.60-0.64 dl/g and terminal carboxyl group content of 12-18 mol/t is subjected to solid phase polycondensation to obtain the polyester chip for solar battery back film with intrinsic viscosity of 0.75-0.80 dl/g and terminal carboxyl group content of 5-10 mol/t. The preparation method has simple reaction conditions and low production costs; the obtained polyester chip can be separately produced into polyester film suitable for solar battery back without the addition of an anti-hydrolysis agent or an ultraviolet absorber, wherein the polyester film has good water vapor barrier property, resistance to wet heat aging and resistance to light aging. The method is not only friendly to the environment and human, but also avoids the problems of uneven dispersion and inconsistency of product performance of blend film production.

The invention provides a UV crosslinking and curing acrylate modified EVA optical adhesive film and a preparation method thereof. The EVA optical adhesive film is prepared from the following raw materials in parts by weight: 50-93 parts of ethylene-vinyl acetate copolymer, 7-50 parts of multifunctional acrylate reactive monomer, 0.5-3 parts of free radical photoinitiator, photostable 0.1-0.5 part of anti-oxidant, 0.1-0.5 part of antioxidant, 2.5-10 part of coupling agent. The EVA optical adhesive film not only has the characteristics of simple lamination process, can be reworked, improves production efficiency, reduces defective rate and production cost, but also has excellent mechanical properties, water vapor barrier properties, heat resistance and stability, and other weather resistance.

The invention discloses an EVA adhesive film for encapsulating a solar cell and a preparing process thereof. The EVA adhesive film is mainly characterized in that polyacrylamide is added into raw material components, the polyacrylamide is used as an acid-absorbing water repellent, and a small quantity of free acetic acid in EVA and acid micromolecular substances generated in the ageing process are effectively eliminated or neutralized, so that the encapsulating adhesive film has excellent vapor blocking performance. As the adopted polyacrylamide is nanoscale granules or powder and does not influence the light transmittance of the adhesive film basically, the PID resistance of the assembly is effectively improved.

The invention relates to a PPR insulating composite tube for home decoration and a preparation method of the composite tube. The composite tube is of a three-layer composite structure, the inner layer of a PPR or PPR aluminum-plastic composite tube is coated with an expanded polyethylene insulating layer through equipment, the expanded polyethylene insulating intermediate layer is coated with a weather-resistant and scratch-resistant outer protection layer through an extruding machine, closed-cell expanded materials are adopted by the expanded polyethylene insulating layer, the cell sizes range from 0.2 mm to 0.5 mm, and the weather-resistant and scratch-resistant layer is prepared from 60%-90% of LLDPE, 5%-15% of HDPE, 4%-20% of EVOH, 0.5%-2% of silane-modified nano-titanium dioxide and 0.5%-2% of compound additives. The expanded polyethylene insulating layer is obtained through a one-step method. The PPR insulating composite tube has the insulating and energy saving properties and the excellent weather-resistant and scratch-resistant properties, a synchronous coating molding process is adopted in the production process, the production efficiency is improved, the manufacturing cost is reduced, and the PPR insulating composite tube has a good market application prospect.

The invention provides a resin composition for a base material of photovoltaic backboard and a preparation method of a photovoltaic backboard. The resin composition comprises the following components in parts by weight: 40-60 parts of polysilsesquioxane resin, 40-60 parts of epoxy resin, 5-10 parts of curing agent, and 0.01-1 part of accelerant. The photovoltaic backboard takes the resin composition which contains polysilsesquioxane resin, the epoxy resin, the curing agent and the accelerant as the base materials, and takes glass fiber cloth as a reinforcing material, has excellent characteristics of light weight, high strength and good light transmission, and can be used for substituting the existing photovoltaic backboard.

The invention discloses a thermal conductivity filler composition. The thermal conductivity filler composition is characterized by being prepared from the following components in parts by weight: 90 to 95 percent of component A and 5 to 10 percent of component B, wherein the component A is prepared from thermal conductivity filler and a silane coupling agent, and the silane coupling agent accountsfor 1 to 3 percent of the total weight of the component A; the component B is prepared from graphene oxide and isocyanate, and the isocyanate accounts for 70 to 80 percent of the total weight of thecomponent B. The invention also discloses a high thermal conductivity insulating composite material and a high thermal conductivity insulation base film and preparation methods of the high conductivity thermal insulating composite material and the high thermal insulation base film. The high thermal conductivity insulating composite material has high thermal conductivity, good insulation and mechanical properties, good dielectric properties and high water vapor barrier property.

The invention discloses a method for preparing a bamboo leaf flavonoid fish scale gelatin edible fresh-keeping film. The method is characterized by comprising the following steps: dissolving tilapia mossambica scale gelatin in water to absorb water and swell for 18-22 minutes, and dissolving in a water bath kettle at 45-55 DEG C for 20 minutes; then adding glycerinum which is 3 percent of mass of the tilapia mossambica scale gelatin, magnetically stirring and uniformly mixing, adding bamboo leaf flavonoid which is 0.4-0.8 percent of mass of the mixed liquid, and magnetically stirring and uniformly mixing to obtain film forming liquid; centrifugally degassing the film forming liquid at a speed of 3500-4500 revolutions/minute for 1-2 minutes, pouring into a glass sheet for tape casting; putting the glass sheet in an air dry oven, controlling the temperature to be 22-28 DEG C, drying with air blast for 2-4 hours, and peeling the film. The bamboo leaf flavonoid fish scale gelatin edible fresh-keeping film has the advantages of excellent ultraviolet blockage, excellent ductility, excellent water vapor barrier property and good heat stability.

The invention belongs to the technical field of food packaging material preparation, and particularly relates to a transparent high-barrier food packaging composite film and a preparation method thereof. The transparent high-barrier food packaging composite film comprises a first film layer, a coating layer, an adhesive layer, a second film layer, a coating layer, an adhesive layer and a third film layer which are arranged in sequence, and the coating layer is a waterborne polyurethane-nano silicon mixed coating layer. The transparent high-barrier food packaging composite film prepared by theinvention still has excellent barrier property after being cooked and sterilized at the high temperature of 121 DEG C for 30 minutes, so that the shelf life of food is greatly prolonged, and the safety and sanitation of the food are guaranteed.

The invention relates to the technical field of solar cell back panels, in particular to a novel solar cell back panel and a preparation method thereof. The solar cell back panel is prepared by a fluorine-containing polymer, a polyacrylate polymer layer and a two-way stretch polyester film through multilayer co-extrusion coating technology. According to the novel solar cell back panel and the preparation method thereof, the technique is simple, the production cycle is short, the continuous industrial production is facilitated, the harm to the health of operating staff and the pollution to environment, caused by organic solvent type adhesive, is effectively avoided, the defect of poorer mechanical property of the solar cell back panel prepared by the multilayer co-extrusion technology is improved, and the polyacrylate polymer layer with hydrolysis resistance and ageing-resistant property is adopted, has good weather resistance ability, moisture barrier property, mechanical property and interlaminar peel strength, and can effectively guarantee the long-term operation of a solar component.

The invention discloses a large-area CVD graphene doping and transferring method which can ensure the stable doping effect of CVD graphene and can avoid the transferring damage. The method comprises the following steps: S1, growing a CVD graphene layer on a catalytic substrate; S2, forming a dopant absorption layer on the CVD graphene layer; S3, forming a transferring supporting layer on the dopant absorption layer; S4, separating the catalytic substrate; S5, rotating a composite structure of the CVD graphene layer, the dopant absorption layer and the transferring supporting layer obtained inS4 for 180 degrees, and then placing on a target substrate; S6, soaking the composite structure obtained in S5 in a doping aqueous solution; and S7, cleaning and drying the composite structure soakedin S6. By adopting the large-area CVD graphene doping transferring method, the graphene layer can be efficiently, uniformly and stably doped; and the effective supporting protection can be provided inthe transferring process, the damage of a graphene membrane is avoided, and the transferring completeness of the large-area CVD graphene layer is ensured.

The invention relates to the technical field of photovoltaic module packaging adhesive films, in particular to a multilayer coextruded anti-polarization composite adhesive film. The composite adhesivefilm comprises a POE layer, an anti-polarization layer and an EVA layer arranged from top to bottom sequentially. After adoption of the structure, the composite adhesive film has the benefits as follows: 1, the EVA layer making contact with a battery surface has better compatibility with a polarity aid, and bubble, non-melting and piece combining problems during module lamination can be solved; 2, ethylene segments contained in copolymer resin in the anti-polarization layer have better compatibility with POE and EVA, and higher surface bonding can be formed; besides, acrylate has higher polarization performance, and negative voltage values produced by modules through outer frames can be reduced, so that the anti-PID performance of modules is improved; 3, the POE layer making contact witha back plate and glass has better vapor barrier performance, the light transmittance and volume resistivity of the adhesive film can be increased, thus, electric potential on battery pieces can be increased, the power generation efficiency of the modules can be improved, and the service life of the modules can be prolonged.

The invention provides a modified polypropylene membrane, and a preparation method thereof. The preparation method comprises following steps: vinyl acetate, allyl glycidyl ether, and an initiator aresubjected to primary polymerization so as to obtain a vinyl acetate-allyl glycidyl ether copolymer; at least a part of the vinyl acetate-allyl glycidyl ether copolymer is used for modification of silicon dioxide so as to obtain a silicon dioxide modifying agent; a first polypropylene resin and the silicon dioxide modifying agent are subjected to melt blending and bidirectional stretching treatmentsuccessively so as to obtain the modified polypropylene membrane. According to the preparation method, polypropylene is injected among net-shaped fiber bundles, on one hand, it is beneficial for improving of the mechanical strength of the modified polypropylene membrane, and reducing the number and the length of cracks on the surface of the modified polypropylene membrane, and on the other hand,it is beneficial for formation of a compact structure of the surface of the modified polypropylene membrane, the compact structure is beneficial for reducing of diffusion rate of organic solvents, oxygen, and water vapor from the outside into the modified polypropylene membrane, and is beneficial for improving of the barrier properties of the modified polypropylene membrane.

The invention discloses a cellulose acetate nano composite material with ultraviolet shielding and bacteriostatic properties and a preparation method thereof. The cellulose acetate nano composite material is composed of the following components by weight: 96-99.5 parts of cellulose acetate and 0.5-4 parts of copper complex modified halloysite. The copper complex modified halloysite is used as a modifier, so that the performance of the cellulose acetate can be effectively improved. The cellulose acetate nano composite material prepared by the invention has excellent ultraviolet shielding performance, bacteriostatic performance, thermal stability, water vapor barrier property, low hygroscopicity and low cytotoxicity, can keep high optical transparency, and is simple in preparation process, environment-friendly, low in cost, suitable for large-scale production, and has good application prospects in the fields of packaging, ultraviolet protection and the like.

The invention provides a composition for forming a sealant, an application thereof in the photovoltaic field, and a photovoltaic module. The composition includes an olefin polymer, a silane-modified olefin polymer, and a thixotropic agent. The thixotropic agent is added into the olefin polymer and silane modified olefin polymer system, so that the composition has a good thixotropic performance inthe sealant preparation process and the subsequent coating process of the sealant. The good thixotropic property can greatly reduce the probability of bubbles existing in the sealant in the laminatingprocess. The sealant formed by the composition has the advantages of high thermal stability, good degradation resistance under high-intensity ultraviolet rays, low cost and the like. The sealant formed by the composition also has the advantages of excellent water vapor barrier property, excellent thermal stability, excellent degradation resistance under ultraviolet rays, low cost and the like, and can meet the requirement of the photovoltaic field for the long-term stability of the product in the outdoor environment.

The invention belongs to the field of biodegradable materials. The invention discloses a water vapor barrier biodegradable polymer film as well as preparation and application thereof. The preparationmethod comprises the following steps: blending the biodegradable polymer and the cross-linking agent to obtain a special material, molding the special material to form a thick film, carrying out bidirectional stretching on the thick film, and carrying out electron beam irradiation to obtain the water vapor barrier biodegradable polymer film, thereby improving the water vapor barrier property of the biodegradable polymer film. According to the invention, the overall flow process design of the preparation method is improved, wherein the biodegradable polymer film is modified by using a two-way stretching process and an electron beam irradiation technology, so that the problem of poor water vapor barrier property of the biodegradable polymer film can be effectively solved, and the biodegradable polymer film can be widely applied to the fields of agricultural mulching films, food and daily necessity packaging, electronic product packaging and the like.

The invention discloses a packaging adhesive film and a solar cell module using the packaging adhesive film, the packaging adhesive film comprises an outer layer, a PO core layer and an inner layer, the outer layer is EVA or EVA/PE, the PO core layer is a polyolefin and/or polyolefin elastomer modified material, and the inner layer is crosslinked EVA. The solar cell module comprises a back plate and a cell piece, the packaging adhesive film is arranged between the back plate and the cell piece, the outer layer of the packaging adhesive film is close to the back plate, and the inner layer of the packaging adhesive film is close to the cell piece. The packaging adhesive film has good binding force with the backboard or the glass, the phenomenon of delaminating of the adhesive film and the glass is avoided, acetic acid is not generated after long-term use, and the PID risk of the assembly is reduced.

The invention relates to a food-grade rust-proof biaxially-oriented polypropylene film. The food-grade rust-proof biaxially-oriented polypropylene film comprises a substrate and a coating layer on thesubstrate surface, wherein a primer layer is arranged between the coating layer and the substrate; the coating layer is a modified polypropylene coating formed by applying modified barrier polypropylene latex to the surface of the primer layer and drying the latex; the ultrahigh vapor-barrier polypropylene latex is prepared from raw materials in parts by weight as follows: 52-95 parts of deionized water, 0.9-1.9 parts of sodium percarbonate, 0.5-2.3 parts of vinyl chloride, 37-40.9 parts of polypropylene, 2.9-3.9 parts of polyvinyl alcohol, 6-8 parts of propionamide and 1-2 parts of polytetrafluoroethylene propyl ester. The traditional food-grade rust-proof biaxially-oriented polypropylene film is modified, so that the food-grade rust-proof biaxially-oriented polypropylene film is endowedwith ultrahigh vapor barrier performance while keeping original characteristics.

The invention belongs to the field of barrier films for blocking water vapor. Based on disadvantages of poor water vapor barrier effect and complex process in the prior art, the invention provides a light-transmitting barrier composite film with characteristics of good barrier effect and simple process and a preparation method thereof. The light-transmitting barrier composite film sequentially comprises a first macromolecule polymer layer, a first adhesive layer, a second macromolecule polymer layer and a second adhesive layer, wherein the first macromolecule polymer layer is subjected to inorganic treatment and has a thickness of 25-150 [mu]m, the first adhesive layer has a thickness of 5-50 [mu]m, the second macromolecule polymer layer is subjected to inorganic treatment and has a thickness of 25-150 [mu]m, and the second adhesive layer has a thickness of 10-250 [mu]m. Compared with the light-transmitting barrier composite film in the prior art, the light-transmitting barrier composite film is simple in preparation process and good in barrier performance, has the water vapor transmission rate of less than 10<-4> g/m<2>/day, and further has good peel strength and good filling performance.