2125 results about "Vinyl alcohol" patented technology

The invention relates to the technical field of polymeric membrane materials, and particularly discloses an antistatic polyethylene composite membrane and a preparation method thereof. Comprising the following raw materials in parts by weight: 100 parts of low-density polyethylene, 5-9 parts of high-density polyethylene, 10-20 parts of maleic anhydride grafted polyethylene, 8-15 parts of a polyvinyl alcohol modified material, 3-5 parts of antistatic modified carbon black, 0.5-1 part of an antioxidant and 1-2 parts of a dispersing agent, the polyethylene composite film has excellent dispersibility, can effectively enhance the mechanical properties of the polyethylene composite film through the synergistic effect of physical filling and chemical grafting, forms a layer of conductive network structure, namely a conductive film, on the surface of the material through the combined effect of the polyethylene composite film and the antistatic agent, prevents the generation and accumulation of static electricity, and has good compatibility among the raw materials. And the material has excellent mechanical property and antistatic property.

The invention discloses a preparation method of a degradable transparent conductive polymer film, and belongs to the technical field of film preparation. Preparing dispersion liquid I through graphene oxide quantum dots; preparing a dispersion liquid II from polyaniline nanofibers; dissolving pyrrole and toluenesulfonic acid in N, N-dimethylformamide to prepare a reaction solution, adding the dispersion liquid I and the dispersion liquid II, stirring, and adding ferric chloride hexahydrate to obtain a reaction solution; adjusting the pH value of the reaction solution to 1.5, and heating to obtain a polypyrrole solution; preparing cellulose acetate, polyvinyl alcohol and N, N-dimethylformamide to obtain a cellulose acetate solution; mixing the polypyrrole solution and the cellulose acetate solution, adding glutaraldehyde to obtain a mixed solution, and pouring the mixed solution into a mold to prepare a composite wet film; and putting the composite wet film into a hot-pressing forming machine for hot-pressing to generate the polymer film. The conductive polymer film prepared by the invention can be applied to the fields of supercapacitor electrode materials, electromagnetic shielding materials, flexible sensors and the like, and provides a new high-performance material choice for the development of related fields.

The invention discloses a high-barrier polycrystalline silicon packaging film and a preparation method thereof, and relates to the technical field of packaging materials. The high-barrier polycrystalline silicon packaging film consists of a polyester film carrier and functional slurry, the functional slurry is prepared from the following raw materials in parts by weight: 15 to 25 parts of ethylene-vinyl alcohol copolymer, 10 to 18 parts of polyvinylidene chloride, 5 to 10 parts of modified nano montmorillonite, 8 to 15 parts of modified polylactic acid, 3 to 6 parts of tributyl citrate, 1 to 3 parts of antioxidant 1010, 1 to 3 parts of ultraviolet light absorber UV-531, 0.5 to 1.5 parts of nucleating agent NA-11, 1 to 2 parts of silane coupling agent KH-550 and 3 to 7 parts of modified silicon dioxide aerogel; 2 to 5 parts of vinyl trimethoxy silane, 1 to 3 parts of nano silver and 20 to 30 parts of deionized water. The high-barrier polycrystalline silicon packaging film has excellent barrier performance, and can effectively block oxygen, water vapor and the like. The polycrystalline silicon packaging film is good in mechanical performance, not prone to damage, antibacterial, antioxidant and anti-ultraviolet, the quality guarantee period of polycrystalline silicon can be prolonged, the product quality can be guaranteed, and the polycrystalline silicon packaging film has great application value in the field of polycrystalline silicon packaging.

The invention provides a carbon nanotube / polyvinyl alcohol hydrogel and a preparation method and application thereof, and belongs to the technical field of composite materials and flexible electron cross materials. Cellulose nanofibers and multi-walled carbon nanotubes are dispersed in deionized water to obtain dispersion liquid; uniformly mixing a polyvinyl alcohol solution and the dispersion liquid to obtain a mixed solution; carrying out oriented freezing forming on the mixed solution, and then freeze-drying the mixed solution to obtain an aerogel sample; performing hot pressing on the aerogel sample to obtain a thin film material; and swelling and balancing the film material in deionized water to obtain the carbon nanotube / polyvinyl alcohol hydrogel. According to the invention, collaborative optimization of conductive network continuity, interface bonding strength and energy dissipation capability is realized, so that high conductivity, high stress and obdurability are considered, and the material is endowed with multi-dimensional strain sensing capability and signal stability; and a new idea is provided for realizing effective balance between high conductivity and excellent mechanical properties of the hydrogel material.

The invention discloses a preparation method of a salt-resistant polyurethane sponge evaporator for a photo-thermal interface, which comprises the following steps: taking polyurethane sponge as a support framework, taking polyvinyl alcohol as a precursor solution, adding carbon black and PEDOT: PSS (poly (3, 4-ethylenedioxythiophene): poly (styrenesulfonate)) into the precursor solution as photo-thermal materials, and synthesizing the salt-resistant polyurethane sponge evaporator by an extrusion thermal crosslinking freeze-drying method. According to the obtained evaporator, the excellent photothermal conversion performance of carbon black / PEDOT: PSS and a porous framework structure mainly comprising polyurethane / polyvinyl alcohol are fully utilized, the water absorption, the mechanical performance and the photothermal conversion efficiency of the evaporator are effectively improved, the heat conductivity is reduced, it is guaranteed that salt crystals do not appear inside and on the surface of the evaporator while efficient interface evaporation is achieved, and the service life of the evaporator is prolonged. The device can be widely applied to solar interface evaporation in saline water, actual seawater or high-salinity wastewater so as to obtain clean water resources.

The invention relates to the technical field of blocking medicine bottles, and particularly discloses a blocking medicine bottle and a preparation method thereof, aiming at the problems that the upper limit of the blocking performance of the existing blocking medicine bottle is low and the blocking performance is difficult to break through due to the fact that the blocking performance of the existing blocking medicine bottle is mostly realized through structural design. A bottle body of the blocking medicine bottle comprises an inner layer, a secondary inner layer, a middle layer, a secondary outer layer and an outer layer which are sequentially arranged in a covering mode. The inner layer comprises polyethylene; the secondary inner layer comprises an ethylene-methyl acrylate copolymer; the middle layer comprises an ethylene-vinyl alcohol copolymer, cyclic polyolefin and modified montmorillonite; the secondary outer layer comprises an ethylene-methyl acrylate copolymer; the outer layer comprises polyethylene, cyclic polyolefin and modified montmorillonite. The barrier medicine bottle is formed by compositing five layers of materials, the oxygen and water transmittance is low, the barrier property is high, and the barrier medicine bottle has great application value in packaging of medicine or food and the like.

The invention relates to the technical field of chlorinated polyvinyl chloride plastics, in particular to a PVC corrosion-resistant cable protection pipe and a preparation process thereof. The invention aims to solve the problem that the mechanical property and the corrosion resistance of the existing PVC cable protection pipe cannot be considered at the same time. Chlorinated polyvinyl chloride and polyvinyl chloride are subjected to hot mixing to obtain matrix resin, and the corrosion-resistant additive, the composite flame retardant, the flexibilizer and other additives are added to obtain the cable protection tube. The corrosion-resistant additive is obtained by grafting and modifying nano silicon dioxide with epoxy resin and premixing with an ethylene-vinyl alcohol copolymer; the composite flame retardant comprises core layers of nitrogen series, phosphorus series and inorganic hydroxides and a shell layer of an acrylate polymer, and is obtained through a core-shell reaction; the cable protection pipe is prepared through a multi-step mixing process; by introducing the core-shell structure and the corrosion-resistant auxiliary agent, efficient flame retardance and corrosion resistance are achieved, stress is buffered through the flexible shell layer, and the mechanical property of the material is maintained.

The invention discloses a polyvinyl alcohol composite film as well as a preparation method and application thereof in food coloring detection. The polyvinyl alcohol composite film is prepared from raw materials including phenylboronic acid modified carbon dots and polyvinyl alcohol through a thermocuring reaction, a phenylboronic acid group on the surface of the phenylboronic acid modified carbon dot and polyvinyl alcohol form a reversible covalent bond crosslinking point based on boric acid ester so as to form a dynamic three-dimensional network, and the structural formula of the phenylboronic acid modified carbon dot is # imgabs 1 #. The phenylboronic acid modified carbon dot is simple in process, easy to process and form and simple and convenient to use; compared with the prior art, the carbon dots modified by phenylboronic acid groups and the polyvinyl alcohol are added, the crosslinking effect between the carbon dots modified by the phenylboronic acid groups and the polyvinyl alcohol is remarkably enhanced, the mechanical strength and water resistance of the composite film are improved, the food coloring detection capacity of the composite film is improved, and in addition, the composite film further has the characteristic of being capable of being reprocessed, so that the composite film has wide application value.

The invention discloses an ethylene-vinyl alcohol copolymer and a preparation process thereof, and relates to the technical field of EVOH. According to the preparation process of the ethylene-vinyl alcohol copolymer, through gradient control of EVA polymerization and alcoholysis process conditions, on one hand, uniform control of heat release in a polymerization stage and an alcoholysis stage can be realized, heat in each stage is fully utilized, and the conversion rate and alcoholysis efficiency in the polymerization process are improved; on the other hand, effective regulation and control of EVOH composition, molecular weight distribution, molecular chain sequence structure and stereoregularity can be realized; finally, side reactions in the polymerization stage and the alcoholysis stage can be reduced, and generation of gel and impurities is reduced.

The invention discloses an ethylene-vinyl alcohol copolymer and a preparation method thereof, and relates to the technical field of resin. According to the technical scheme, the preparation method comprises the following steps: adding ethylene, low-carbon alkane, alkyl acid ethyl ester, alkyl acid vinyl ester and a carbon-carbon skeleton initiator into a reaction kettle, and carrying out a free radical polymerization reaction; adding a polymerization inhibitor to terminate the reaction, removing low-carbon alkane, unreacted ethylene and alkyl acid vinyl ester, and preparing the reaction liquid into an alcoholic solution; adding a catalyst into the alcohol solution for saponification reaction, and then performing acid pickling, water washing and drying to obtain the ethylene-vinyl alcohol copolymer. The low-carbon alkane which is low in boiling point, easy to vaporize and high in latent heat of vaporization and the saturated alkyl acid ethyl ester with good solubility are adopted as the mixed solvent to replace a traditional alcohol solvent, so that removal and control of reaction heat are facilitated, generation of insoluble gel is reduced, a copolymer with narrow molecular weight distribution is easy to obtain, and the method is suitable for industrial production. The cost that azeotrope formed by the alcohol solvent and the monomer is difficult to separate and recover is greatly reduced, and the production efficiency is improved.

The invention discloses a melt blending preparation process of a semiconductive shielding material for an ultrahigh-pressure crosslinked polyethylene cable, which comprises the following steps: S1, premixing low-density polyethylene and an ethylene-vinyl alcohol copolymer in proportion, the vinyl alcohol chain segment content of the ethylene-vinyl alcohol copolymer being 25%-45%; s2, performing plasma surface treatment on carbon black, and compounding the carbon black with carbon nanotubes to form a conductive filler system; s3, under the protection of inert gas, adding the matrix resin in the step S1 and the conductive filler in the step S2 into a double-screw extruder in stages, and synchronously adding a hindered phenol and phosphite compound antioxidant; and S4, carrying out segmented mixing under the temperature gradient of 160-210 DEG C. Through synergistic compounding of the plasma surface modified carbon black and the carbon nanotubes and in combination with a staged feeding process, directional dispersion of the conductive filler is realized, a three-dimensional interpenetrating conductive network is formed, and the local electric field homogenization capability of the ultrahigh-voltage cable is remarkably improved.

The invention discloses a corrosion-resistant protective sleeve for an aluminum alloy cable and a preparation method of the corrosion-resistant protective sleeve, and belongs to the field of cable protective sleeves. The corrosion-resistant protective sleeve for the aluminum alloy cable is prepared from the following raw materials in parts by mass: 40 to 50 parts of ethylene propylene diene monomer, 15 to 25 parts of fluorinated silicone rubber, 5 to 10 parts of modified thiolated ethylene-vinyl alcohol copolymer, 8 to 15 parts of metal fluoride nanocrystal, 4 to 8 parts of vulcanizing agent, 3 to 8 parts of plasticizer and 3 to 5 parts of flame retardant. The two rubber matrixes are compounded to form a physical barrier layer to prevent corrosion media and water molecules from permeating, material pores can be filled with the metal fluoride nanocrystals, diffusion channels of the corrosion media are reduced, and hydrophobicity and corrosion resistance are improved through cooperation of the metal fluoride nanocrystals and the fluorinated silicone rubber. The modified thiolated ethylene-vinyl alcohol copolymer can improve the compatibility between rubber matrixes and form coordination with metal ions of the metal fluoride nanocrystals, so that the diffusion path of a corrosive medium is prolonged, and the corrosion of the corrosive medium is synergistically blocked.

The invention discloses a preparation method of polyvinyl alcohol-based electromagnetic shielding conductive hydrogel. The preparation method comprises the following steps: (1) preparing a high-concentration dimethyl sulfoxide aqueous solution; adding polyvinyl alcohol into the dimethyl sulfoxide aqueous solution, heating and stirring to completely dissolve the polyvinyl alcohol to obtain a mixed solution; (2) putting the mixed solution after standing into a mold, and freezing at low temperature to obtain PVA gel; (3) an electrolyte salt solution is prepared, and the electrolyte salt solution contains low-concentration dimethyl sulfoxide; and placing the PVA gel in an electrolyte salt solution, and carrying out ion exchange to obtain the polyvinyl alcohol-based electromagnetic shielding conductive hydrogel. The polyvinyl alcohol-based electromagnetic shielding conductive hydrogel prepared by the method has high transparency, strength and ionic conductivity, the light transmittance reaches up to 75.2%, and the compressive strength reaches up to 2.97 MPa when the strain is 80%; the ionic conductivity can reach 10.34 mS / cm; meanwhile, the effective electromagnetic shielding effectiveness (gt; gt) can still be kept at the low temperature of-60 DEG C for more than 60 hours; 30 dB).

The present invention belongs to the technical field of preparation of high-purity rare metal materials, and specifically relates to a method for preparing nano-scale high-purity germanium dioxide. High-purity germanium tetrachloride, polyvinyl alcohol solution and water are prepared, mixed and stirred to form a mixed solution, and then germanium dioxide is extracted through a hydrolysis reaction. The generated high-purity germanium dioxide is then strengthened by ultrasonic waves to prepare nano-scale germanium dioxide, thereby obtaining high-purity germanium dioxide with smaller particle size.

The invention relates to the technical field of pharmaceutical preparations, and provides a minoxidil film coating agent as well as a preparation method and application thereof. The minoxidil film coating agent provided by the invention comprises 40-60% of propylene glycol, 3-7% of polyvinyl alcohol, 20-30% of ethanol, 1-7% of minoxidil and the balance of water. According to the invention, propylene glycol is taken as a solvent, a plasticizer and a transdermal absorption enhancer, polyvinyl alcohol is taken as a film-forming material, and ethanol is taken as a volatile agent, after administration, ethanol is volatilized to promote film formation of polyvinyl alcohol, and propylene glycol enhances the plasticity of the formed film, so that the effect of reducing liquid medicine loss is achieved, the local medicine concentration is increased, and the bioavailability is improved. The minoxidil liniment disclosed by the invention has excellent skin permeability, can effectively convey a medicine to a required part, and can ensure that the medicine is released at a fixed position of the skin and is accurately administered in a medicine release process, so that the stimulation of liquid medicine flow to other parts is reduced, and a good treatment effect is achieved.

The invention belongs to the technical field of sole materials, and particularly relates to a quick-rebound fatigue-resistant sole foaming composite material and a preparation method thereof. According to the invention, the alpha-olefin ethylene copolymer and the modified ethylene-vinyl alcohol copolymer are mixed in an internal mixer, and hydroxyl groups of the modified ethylene-vinyl alcohol copolymer and the alpha-olefin ethylene copolymer form a hydrogen bond cross-linked network under the action of high-temperature shearing; a blend obtained through mixing, high-branching-degree polyolefin, modified nano-zinc oxide I and an auxiliary agent are added into a double-screw extruder for extrusion, the modified nano-zinc oxide is embedded into branching points of the high-branching-degree polyolefin, molecular chain slippage is limited through a pinning effect, the fatigue life of the composite material is prolonged, and the composite material is suitable for large-scale production. The preparation method comprises the following steps: preparing a foaming material, mixing the foaming material with azodicarbonamide, an antioxidant 1010 and the like, injecting the mixture into a supercritical device, effectively improving the density gradient, rebound resilience and mechanical properties through segmented pressure relief, and finally performing hot-pressing shaping to form the quick-rebound fatigue-resistant sole foaming composite material.

The application discloses a kind of imitated plant leaf hydrogel composite material and preparation method thereof, belong to bionic composite material field.The application first by colorant compounding preparation printing paste, and fabric is printed, obtain the green fabric that can realize to plant leaf " green peak " and " red edge " spectral characteristic simulation, and with green fabric simulation leaf structure in fence organization and skeleton;Then with biomaterial polyvinyl alcohol (PVA) as base material, join with strong hygroscopic monomer and crosslinking agent, initiator blend preparation hydrogel prepolymer solution;Finally, hydrogel prepolymer solution is poured into the mold containing green fabric and copolymerization, it directly forms hydrogel in fabric surface and pore interior, obtains imitated plant leaf hydrogel composite material.The material gets rid of the dependence on hygroscopic salt, has water absorption and simulation effect stable, durability is good and the like advantages.

The invention relates to the technical field of water pollutant removal, in particular to a UiO-66 / sodium carboxymethyl cellulose / polyvinyl alcohol / melamine sponge composite material and a preparation method and application thereof.The preparation method comprises the steps that zirconium chloride and terephthalic acid are dissolved in an organic solvent to obtain a mixed solution, the mixed solution is transferred into a reaction kettle, and through solvothermal reaction, the UiO-66 / sodium carboxymethyl cellulose / polyvinyl alcohol / melamine sponge composite material is obtained; the preparation method comprises the following steps: preparing UiO-66 powder; putting UiO-66 powder into the sodium carboxymethyl cellulose solution, and uniformly stirring the UiO-66 powder and the sodium carboxymethyl cellulose solution to obtain a UiO-66 / CMC mixed solution; placing the UiO-66 / CMC mixed solution in a polyvinyl alcohol solution, and uniformly stirring the UiO-66 / CMC / PVA mixed solution to obtain a UiO-66 / CMC / PVA mixed solution; the preparation method comprises the following steps: dipping a melamine sponge in a UiO-66 / CMC / PVA mixed solution to obtain an adsorption saturated melamine sponge; the UiO-66 / CMC / PVA / coated MS composite material is obtained by repeatedly freezing and thawing the adsorption saturated melamine sponge for multiple times and then freeze-drying, the composite material can be used for rapidly, efficiently and selectively removing phosphate or fluorine ions and the like in water and is convenient to separate and recycle, and a new thought is provided for development of efficient water treatment adsorbent materials.

The present invention relates to a copolymer composition including a first copolymer including a vinyl alcohol monomer unit and a vinyl amine-based monomer unit, and a second copolymer including a vinyl alcohol monomer unit and an acrylic acid salt-based monomer unit, and to an anode slurry, an anode, and a secondary battery including the copolymer composition.

The invention belongs to the technical field of food preservation, and particularly relates to a chitosan / polyvinyl alcohol film loaded beta-acid / beta-cyclodextrin inclusion compound as well as a preparation method and application thereof. The method comprises the following steps: adding beta-acid / beta-cyclodextrin into distilled water, grinding and centrifuging, and freeze-drying the obtained supernatant to obtain the beta-acid / beta-cyclodextrin inclusion compound. The preparation method comprises the following steps: mixing a PVA solution with a chitosan solution, adding glycerol to obtain a mixed solution, dissolving the beta-acid / beta-cyclodextrin inclusion compound in water, adding the dissolved beta-acid / beta-cyclodextrin inclusion compound into the mixed solution, stirring, standing and drying to obtain the film. The prepared film has good physical properties and stability, has good oxidation resistance and antibacterial activity, can inhibit adhesion of pathogenic microorganisms such as staphylococcus aureus on the surfaces of perishable fruits, and prolongs the shelf life of the perishable fruits.

A polyvinyl alcohol-cellulose nanocrystal composite hydrogel interface evaporator, and a preparation method therefor and the use thereof. The preparation method for the composite hydrogel interface evaporator comprises the following steps: adding a cellulose nanomicrocrystal, polyvinyl alcohol and an acid liquor to water, mixing same, and heating the mixture to dissolve the polyvinyl alcohol, so as to obtain a hydrogel precursor solution; and adding reduced graphene oxide and a cross-linking agent to the hydrogel precursor solution, uniformly mixing same to obtain a mixed solution, gelatinizing the mixed solution, and then freeze-drying same, so as to obtain a target product. The preparation method is simple to operate, low in terms of cost, and environmentally friendly, and endows the hydrogel with excellent multifunctional properties, including wide spectrum absorption performance, seawater desalination performance, wastewater purification performance, etc.

The present invention discloses a preparation method and use of an Al2O3-Al composite packaging material, and the preparation method comprises the following steps: step A: uniformly mixing aluminum powder, aluminum oxide powder, CuO-TiO2 powder and ceramic particle additive powder to obtain a mixed raw material A; step B: adding a polyvinyl alcohol aqueous solution to the mixed raw material A and grinding it fully to obtain a mixed raw material B; step C: placing the mixed raw material B in a ball mill for ball milling, and obtaining a mixed raw material C after the ball milling is completed; step D: cold-pressing the mixed raw material C to obtain a prefabricated block; step E: placing the prefabricated block in a resistance furnace for sintering, and cooling it to room temperature with the furnace after the sintering is completed, to obtain an Al2O3-Al composite packaging material. The composite packaging material is used to encapsulate an aluminum-silicon alloy phase change heat storage material. The composite packaging material prepared by the present invention can be used to encapsulate an aluminum-silicon alloy phase change heat storage material, and has the advantages of good corrosion resistance and not easy to leak.

The invention discloses an environment-friendly flame-retardant polyvinyl alcohol film and a preparation method thereof, and relates to the technical field of polyvinyl alcohol films. The polyvinyl alcohol film is prepared from the following components in parts by weight: 90 to 110 parts of polyvinyl alcohol, 0.4 to 1.2 parts of polydopamine modified cellulose nanocrystals, 8 to 15 parts of chitosan / phytic acid / boron nitride composite flame retardant and 0.6 to 0.9 part of plasticizer. The preparation method comprises the following steps: adding polyvinyl alcohol into deionized water, dissolving and mixing to obtain a polyvinyl alcohol aqueous solution, adding glycerol, continuously stirring for 1-2 hours, sequentially adding a chitosan / phytic acid / boron nitride composite flame retardant and polydopamine modified cellulose nanocrystals, and uniformly stirring and mixing at 50-70 DEG C to obtain a blended solution; and carrying out film casting on the blended solution. The limit oxygen index of the film is greater than or equal to 30%, the vertical combustion grade is V-0, the tensile strength is greater than or equal to 40%, the elongation at break is greater than or equal to 140%, and the light transmittance is greater than or equal to 85%.

Provided in the present invention are a polyvinyl alcohol powder and hydrogel, and a preparation method therefor and the use thereof. The method mainly comprises: preparing a polyvinyl alcohol powder from polyvinyl alcohol, then mixing same with water and swirling same to make the powder swell into discrete microgel particles, and applying pressure to make polyvinyl alcohol molecular chains at the interface of the microgel diffuse, entangle and link with each other and crystallize and fuse, so as to prepare a polyvinyl alcohol hydrogel. With regard to the polyvinyl alcohol powder, the preparation method therefor comprises direct pulverization, or physical crosslinking prior to pulverization, or casting into a film prior to pulverization, etc.; and preferably, the powder is prepared by first performing casting into a film and then pulverizing same, which can make the powder more uniform in terms of crystallinity and more stable in terms of performance. With regard to the swelling process of the polyvinyl alcohol powder, it is necessary to strictly control the ratio of the powder to water, the temperature and the time to ensure that before swelling is complete, transferral into a mold is conducted and pressure is applied to form a hydrogel. Products meeting different performance requirements, including prostheses for the soft tissues of various locomotor systems, medical and esthetic filling materials, etc., are prepared by adjusting process parameters; and the polyvinyl alcohol powder can also be used for preparing PVA plastics having a three-dimensional structure, and thus has broad application prospects.

This invention discloses a one-piece molded all-plastic flexible hose sheet and its composite hose, belonging to the field of polymer material technology. The one-piece molded all-plastic flexible hose sheet of this invention has a three-layer structure: an outer PE film, an intermediate layer, and an inner PE film. The intermediate layer is selected from one of the following: an intermediate polymer layer, a three-layer composite layer formed by an intermediate polymer layer, a polyethylene layer, and an intermediate polymer layer, or a three-layer composite layer formed by an intermediate polymer layer, an ethylene-vinyl alcohol copolymer layer, and an intermediate polymer layer; the intermediate layer may have a double-sided coated or uncoated adhesive layer; the intermediate polymer layer is polymerized from 2,6-dihydroxyisophthalic acid, diaminoalkane, and 4,4'-tetraphenylsilane. The all-plastic flexible hose sheet provided by this invention is formed in one piece using a five-layer co-extrusion machine, possessing excellent gas barrier properties, water vapor barrier properties, high mechanical strength, and good interlayer peel strength.

The invention discloses a high-barrier polyethylene film and a preparation method thereof, and relates to the technical field of high polymer materials. The invention discloses a high-barrier polyethylene film. The high-density polyethylene composite material is prepared from the following raw materials in parts by weight: 25 to 40 parts of high-density polyethylene, 15 to 30 parts of linear low-density polyethylene, 8 to 16 parts of ethylene-vinyl alcohol copolymer, 3 to 8 parts of nano montmorillonite, 5 to 10 parts of modified layered double hydroxide, 2 to 6 parts of nano silicon dioxide aerogel, 0.2 to 0.6 part of antioxidant 1076, 0.1 to 0.4 part of light stabilizer UV-770, 3 to 7 parts of tributyl citrate and 1 to 3 parts of octadecanamide. 1-3 parts of polyethylene wax, 0.6-1.2 parts of a silane coupling agent KH560 and 7-12 parts of a functional additive. According to the high-barrier polyethylene film disclosed by the invention, by using the modified layered double hydroxide and the functional additive, the barrier property and the antibacterial property are enhanced, the mechanical property is improved, the comprehensive performance is excellent, and the application prospect is good.

The invention discloses a recoverable high-barrier-property multilayer composite film and a preparation method thereof. The composite film adopts a five-layer symmetrical structure, namely a heat sealing layer, a first bonding layer, a blocking layer, a second bonding layer and a surface protection layer. Wherein the barrier layer is a montmorillonite modified ethylene-vinyl alcohol copolymer, and montmorillonite is modified by a carboxyl functionalized ammonium bromide intercalator; the bonding layer is maleic anhydride grafted polylactic acid; the heat sealing layer contains modified composite filler; the surface protection layer is a polyethylene / graphene modified coupling agent composite system. The preparation method comprises the steps of intercalation modified montmorillonite preparation, barrier layer material melt blending, five-layer co-extrusion casting, gradient hot pressing and curing treatment. The problems that a traditional high-barrier film is unrecyclable, the interlayer binding force is weak and the high-temperature stability is poor are solved, the ultrahigh barrier performance that the oxygen transmission rate is smaller than or equal to 0.5 cm < 3 > / (m < 2 >. 24 h) and the water vapor transmission rate is smaller than or equal to 1.0 g / (m < 2 >. 24 h) is achieved, and the mechanical property retention rate is larger than or equal to 85% after recycling and re-pelletizing.

The invention relates to the technical field of high polymer materials and sealing, in particular to a rubber gasket and a preparation method of the rubber gasket. The preparation method comprises the following steps: enhancing by using an ethylene-vinyl alcohol copolymer (EVOH) with the ethylene content of 29-48%, carrying out compatibility by using a styrene-ethylene-butylene-styrene block copolymer grafted maleic anhydride (SEBS-g-MA) with the grafting rate of more than or equal to 10%, carrying out synergistic reinforcement by using carbon black and nanoscale calcium carbonate, and carrying out premixing, hot-pressing vulcanization and acid environment aging treatment. Through EVOH enhancement, SEBS-g-MA compatibility, filler synergistic reinforcement and process optimization, multiple improvements of compatibility, mechanical properties, barrier property and acid resistance are achieved, key defects of a traditional EPDM gasket are overcome, and the EPDM gasket has remarkable technical advantages and practical value in the high-end sealing field (such as fuel cells and tunnel engineering).

The invention relates to the technical field of fire extinguishing microcapsules, in particular to a high-airtightness perfluorohexanone fire extinguishing microcapsule and a preparation method and application thereof.The perfluorohexanone fire extinguishing microcapsule comprises a composite shell layer and a fire extinguishing core, and the composite shell layer is made of ethylene-vinyl alcohol copolymer resin and silicon dioxide nanoparticles; the fire extinguishing core is a perfluorohexanone fire extinguishing agent and is applied to preparation of indoor fire extinguishing pastes, fireproof coatings and polyurethane adhesive materials. According to the perfluorohexanone fire extinguishing microcapsule disclosed by the invention, the diffusion of low-polarity perfluorohexanone is effectively prevented by utilizing the strong hydrogen-bond interaction between hydroxyl groups in the ethylene-vinyl alcohol copolymer resin, and especially under the condition of relatively high temperature, the perfluorohexanone fire extinguishing microcapsule has a good fire extinguishing effect. The problem that an existing perfluorohexanone fire extinguishing microcapsule is poor in long-term air tightness under the condition of high encapsulation efficiency is effectively solved, and meanwhile harmful substances such as formaldehyde cannot be generated.

The invention relates to the technical field of packaging materials, and discloses a high-barrier multilayer co-extrusion composite film which sequentially comprises an inner layer, a first bonding layer, a first barrier layer, a second bonding layer, a second barrier layer, a third bonding layer and an outer layer from bottom to top. And the second barrier layer is a nano silicon dioxide modified polyvinyl alcohol layer. The two different barrier layers are arranged, the first barrier layer has a good barrier effect on gas, the second barrier layer has outstanding barrier performance on water vapor, and the two barrier layers have a synergistic effect, so that the comprehensive barrier performance of the composite film on oxygen, water vapor, peculiar smell and the like is remarkably improved, the shelf life of a packaged product can be effectively prolonged, and the packaging cost is reduced. According to the high-barrier film, the high-barrier property is ensured, the quality and the performance of a product are ensured, and the use of expensive materials and a complex production process is avoided and the production cost is reduced by reasonably selecting each layer of material and optimizing the structural design on the premise of ensuring the high-barrier property.