46results about How to "Enhanced water vapor transmission rate" patented technology

Substrates, coated with a block copolymer comprising at least four blocks being at least two hard blocks, one soft block and one hydrophilic block, wherein a the soft block is sandwiched between the hard blocks.

This invention relates to protective, multi-layered, breathable fabric constructs. The constructs which are flexible employ a fabric layer and a breathable coating layer applied to the fabric. Under certain preferred embodiments, the fabric constructs also employ an energy dissipating fiber material disposed opposite the coating layer. Also, the present invention teaches a method of protecting a valuable or sensitive object from damage caused by corrosion, weather, bio mass, or other environmental related conditions using the fabric material. The fabric constructs may be post-formed using heat or other methods to create shaped-to-form covers.

The invention discloses an EVA adhesive film with the high water vapor barrier property. The EVA adhesive film is prepared from, by weight, 100 parts of EVA resin, 0.1-5 parts of a cross-linking agent, 0.1-1 part of an antioxidant, 0.3-1 part of an ultraviolet screening agent, 0.3-0.7 part of a light stabilizer and 1-20 parts of lamella packing, wherein the lamella packing is one of sericite, talcum powder, glass flake and mica. The EVA adhesive film with the high water vapor barrier property has good ultraviolet resistance and good main mechanical properties such as tensile strength and tear strength, and can have the good compatibility with other photovoltaic packaging materials and lamination technologies.

The present invention relates to packaging material and its use in the shelf-life extension and quality improvement of products.

The invention discloses an EVA hot melt adhesive film for wall covering and a preparation method thereof. The EVA hot melt adhesive film for wall covering is prepared from 40-70 parts by weight of ethylene-vinyl acetate copolymer, 15-30 parts of maleic anhydride grafted ethylene-vinyl acetate copolymer, 10-25 parts of ethylene-acrylic acid copolymer, 5-20 parts of polyolefin copolymer, 5-30 partsof tackifier, and 0.2-1 part of antioxidant by premixing and tape casting. The EVA hot melt adhesive film prepared by the invention can quickly bond the wall covering to a wall body, has the characteristics of high adhesion, moisture resistance, mildew resistance and no perishability, and does not contain harmful solvents such as benzene, toluene and xylene; the EVA hot melt adhesive film meets environmental requirements and can replace liquid glue applied to the wall covering bonding. The invention also discloses the preparation method of the EVA hot melt adhesive film for wall covering, andthe method has the advantages of simple process, convenient processing and easy operation.

The invention provides a full-biomass porous material slow-release antibacterial active preservative film and a preparation method thereof. The full-biomass porous material slow-release antibacterialactive preservative film comprises 35-45 wt% of a matrix resin, 30-40 wt% of a biological porous substance, 20-25 wt% of an antibacterial agent and 0.9-1.3 wt% of a processing aid. The preparation method comprises the following steps: mixing the biological porous substance with the antibacterial agent to make the biological porous substance fully adsorb the antibacterial agent, mixing the obtainedmixture with the matrix resin and the processing aid, granulating the obtained mixture, and carrying out tape casting to prepare the film. Hyphae, pomegranate rind, shaddock peel, orange peel, bark and straw are porous substances, and can effectively adsorb the active antibacterial agent so as to achieve the slow release effect of the active antibacterial agent and improve the film performance, so that the long-term antibacterial effect on mutton is achieved; and the raw materials are degradable substances, so the pollution problem of agricultural byproducts and the white pollution problem ofplastic package can be solved, and the additional values of agricultural products can be improved.

The invention discloses an EMMA optical film for full fitting of an electronic screen and a preparation method thereof. The EMMA optical film for full fitting of the electronic screen is prepared by pre-mixing 100 parts by weight of an ethylene-methyl methacrylate copolymer (EMMA), 0.5-2.0 parts by weight of a photoinitiator, 0.3-1.5 parts by weight of a crosslinking agent, 0.3-1.2 parts by weightof a tackifier, 0.1-0.6 part by weight of an optical stabilizer, 0.1-1.1 parts by weight of a plasticizer and 0.2-1.0 part by weight of an antioxidant by a stirrer, putting the mixture into a single-screw tape-casting machine and tape-casting into the optical film according to set process parameters. The prepared EMMA optical film has the advantages of excellent bonding properties, high light transmittance, low water vapor transmittance and high weather resistance, also is in thermal plasticity before curing, easily fills segment gaps, adapts to the complex interface fitting, and can adapt torequirements of fitting of electronic screen protection layers, touch control layers and display layers with different sizes.

The invention provides an adhesive tape base material, an adhesive tape provided with the same and a preparation method. The adhesive tape base material comprises a continuous phase and a disperse phase dispersed in the continuous phase; the material of the continuous phase is 55-95 parts by weight of L-polylactic acid, and the material of the disperse phase is 0.25-2.5 parts by weight of toughening filler and 0.25-2.5 parts by weight of a dispersing agent. Raw materials such as L-polylactic acid have biological degradability, so that pollution, on the environment, of the adhesive tape with the base material is reduced; and the proportion of the components is prescribed, so that the adhesive tape base material has medium oxygen gas transmittance and relatively high water vapour transmittance, and can be used for realizing encapsulating agricultural products.

The invention discloses a breathable hemostatic alginate dressing and a preparation method thereof. The dressing consists of the following components in parts by mass: 46-62 parts of potassium alginate, 15-29 parts of carboxymethyl chitosan, phosphoric acid 3‑12 parts of ammonium dihydrogen, 2‑12 parts of hydrogenated lecithin, 8‑21 parts of polyvinyl alcohol, 6‑17 parts of sorbitol, 3‑9 parts of acetyl tributyl citrate, 15‑24 parts of butylene glycol , 2‑10 parts of sodium hyaluronate, 5‑13 parts of licorice extract. The preparation method is as follows: mix potassium alginate, carboxymethyl chitosan and butanediol, and ultrasonicate; then add the remaining components, mix, heat, stir evenly, keep warm, and cool to room temperature; soak degreasing gauze in it, dry Machine dried, sealed, packaged and sterilized by ultraviolet light. The dressing prepared by the invention achieves the effect of hemostasis and improvement of water vapor transmission rate through the synergistic effect of the components, and can be widely used for wound healing.

The invention discloses an antibacterial gas-permeable membrane and a preparation method thereof. The antibacterial gas-permeable membrane comprises the following raw materials in parts by weight: 62-72 parts of polyethylene, 13-17 parts of an ethylene-vinyl alcohol copolymer, 8-12 parts of polylactic acid, 5-7 parts of maleic anhydride grafted polyethylene, 3-4 parts of light calcium carbonate, 3-4 parts of heavy calcium carbonate, 2-3 parts of nano porous silicon dioxide, 1.5-2.5 parts of sepiolite powder, 1.3-1.6 parts of an antibacterial agent, 1.4-1.8 parts of a coupling agent, 2-4 partsof stearate, 1.2-1.4 parts of a surfactant and 2-3 parts of a dispersant. The antibacterial gas-permeable membrane is high in water vapor transmission rate, good in breathability, and high in static water pressure resistance, cannot leak liquid water during use, is low in powder falling weight, low in powder falling amount, high in antibacterial rate and good in antibacterial effect, can be completely degradedwithin 4-6 months in a composting state, and does not cause pollution to the environment,.

The invention provides a preparation method of a PVA/cassava starch/LAE active composite film, and application of the PVA/cassava starch/LAE active composite film in the aspect of bacteriostasis of food packaging, and belongs to the technical field of food packaging materials. Cassava starch is gelatinized and then mixed with a PVA solution and an auxiliary solvent, LAE with the mass concentration being 1-10% is added, heating, stirring and mixing are conducted in a water bath environment to obtain a film casting solution, and finally, tape casting is carried out on the film casting solution to obtain the finished product composite film. The composite film disclosed by the invention can better prevent ultraviolet rays and visible light from penetrating, and is beneficial to preventing food from being degraded and oxidized; and the obtained composite film has relatively high water absorption and water vapor permeability, and has a relatively good fresh-keeping effect.

The invention is applicable to the technical field of thin film packaging structures, and provides an antioxidant for thin film encapsulation, a composition and application of the composition. The structural general formula of the antioxidant is shown in the specification, in the formula, R1, R2, R5 and R6 are independently one of substituted or unsubstituted alkylene of C1 to C20 and substitutedor unsubstituted arylene of C6 to C30; R3 and R4 are independently one of hydrogen, substituted or unsubstituted alkyl groups of C1 to C20, and substituted or unsubstituted aryl groups of C6 to C30 and are same or different; and X1, X2, X3 and X4 are independently one of O, S and substituted or unsubstituted NH. The antioxidant provided by the invention has propenyl with a plurality of photocuringgroups, can optimize the water vapor transmission rate of a packaging film, and reduces miscellaneous gas emission after film formation, so that the service life of the packaging film structure of the organic light emitting device can be prolonged.

The invention discloses a preparation method of an antiviral moisture-permeable coating and an application of the antiviral moisture-permeable coating in preparation of an antiviral moisture-permeablefilm. The preparation method comprises the following steps: 1) reacting polyethyleneimine with halogenated hydrocarbon to obtain polyethyleneimine quaternary ammonium salt; and 2) matching polyethyleneimine quaternary ammonium salt and oxalic acid into a water-based polymer to obtain the antiviral moisture-permeable coating. After the antiviral moisture-permeable coating is attached to a porous base film, heat treatment is performed. The porous base film serves as a base material of the moisture-permeable film, and the antiviral moisture permeable film is obtained. The moisture-permeable filmprovided by the invention has an antiviral capability; the quaternary ammonium salt polymer is added, so that the influence on the water vapor permeability is not obvious, and thus the antiviral moisture-permeable film disclosed by the invention not only has the characteristic of high moisture permeability, but also has excellent antiviral performance, has the functions of blocking aerosol and inhibiting viruses, and is high in water vapor permeability, and can be used for preparing medical protective clothing.

A compound for an encapsulation film and a composition thereof, a film, an organic light-emitting device, and an encapsulation method are provided. The compound has the structure shown in formula 1, and the composition comprises the compound, one or more photocurable and thermocurable propenyl compounds, and one or more compounds that produce a free radical and produce an acid under light or heat. The encapsulation film includes the composition as a film of an organic layer. The organic light-emitting device includes the film. The encapsulation method involves encapsulating the organic light-emitting device using the encapsulation film. The composition containing the compound serves as an organic layer. An encapsulation film for the organic light-emitting device is manufactured by repetitively and alternately laminating an inorganic layer and the organic layer.

The invention discloses a breathable polyurethane fixing film. The breathable polyurethane fixing film comprises a paper frame layer, a polyurethane layer, an adhesive layer and a release layer which are sequentially arranged; the polyurethane layer is a hydrophilic high-moisture-permeability polyurethane film, the adhesive layer is a pressure-sensitive adhesive, through holes are formed in the pressure-sensitive adhesive, and the aperture of each through hole is 1-3 mm; the preparation method of the hydrophilic high-moisture-permeability polyurethane film comprises the following steps: a) preparing a polyurethane prepolymer A, b) preparing a polyurethane prepolymer B, and c) coating the release layer with the polyurethane prepolymer B, and drying the release layer in a tunnel drying oven at the drying temperature of 60-150 DEG C to prepare the hydrophilic high-moisture-permeability polyurethane film with the thickness of 15-25 microns. According to the breathable polyurethane fixing film, the paper frame layer, the polyurethane layer, the adhesive layer and the release layer are arranged in a matched mode, meanwhile, the polyurethane layer with high breathability is prepared, the higher water vapor permeability is achieved, the film is softer and more comfortable, the film is soft and breathable when being attached to the skin, and the comfort of a patient is improved.