515 results about "Low-density polyethylene" patented technology

The invention relates to the technical field of crosslinked polyethylene insulated power cables, in particular to a flame-retardant and insulated low-voltage power cable and a preparation method and application thereof. The flame-retardant and insulating low-voltage power cable comprises the inner core layer, the filler layer, the belting layer, the lining layer, the metal armor layer and the outer sheath layer from inside to outside, and the multiple layers can effectively protect the inner core and endow the cable with better performance; in addition, low-density polyethylene, a furan modified polyethylene compatilizer, a reactive flame retardant, bismaleimide, dicumyl peroxide and an auxiliary are adopted to obtain the cross-linked polyethylene material for the cable outer sheath, and the cross-linked polyethylene material has excellent insulation, flame retardance, strength, toughness and repairing performance.

The invention discloses a cable insulating material which comprises the following components in parts by weight: 40-60 parts of low-density polyethylene, 20-30 parts of an ethylene-vinyl acetate copolymer EVA, 2-5 parts of a composite anti-aging agent, 5-10 parts of a core-shell structure nano composite modifier, 1-2 parts of a lubricant, 3-8 parts of a compatilizer, 20-30 parts of a composite flame retardant, 5-10 parts of a nano reinforcing agent and 2-4 parts of phenylsilane. The core-shell structure modifier strengthens interface bonding, and cooperates with the modified nano reinforcing agent to disperse stress, so that the mechanics and high and low temperature resistance are improved; the composite anti-aging agent inhibits multi-path aging and improves the aging resistance. The material has the advantages of excellent mechanical properties, high and low temperature resistance and outstanding aging resistance, and meets the insulation quality and efficiency requirements of cables in complex use environments.

The application provides a crosslinked polyethylene insulating material with intrinsic self-repairing and recyclable characteristics, a preparation method and application thereof, and relates to the technical field of cable materials.The crosslinked polyethylene insulating material with intrinsic self-repairing and recyclable characteristics is prepared from the following components in parts by weight: 99.7 parts by weight of low-density polyethylene, 1.0-2.6 parts by weight of peroxide, 0.1-0.5 parts by weight of antioxidant, 5-20 parts by weight of maleimide monomer, 0.35-0.7 parts by weight of catalyst, 0.5-3.0 parts by weight of ligand and 0.5-3.0 parts by weight of furan-based small molecule.The low-density polyethylene is functionally modified through catalytic amination reaction, so that the chain breaking and crosslinking in the modification process are avoided, and the mechanical properties, insulating properties and dielectric properties of the crosslinked polyethylene are enhanced through the post-absorption of the introduced peroxide.Meanwhile, the dynamic reversible Diels-Alder reaction introduced by the post-absorption of the furan-based small molecule enables the polyethylene insulating material to have good intrinsic self-repairing effect on mechanical damage and electrical damage.

The invention discloses a flame-retardant flat flexible high-current cable and a preparation method thereof, and relates to the technical field of cables. The cable comprises a flat conductor, an insulating layer, a shielding layer, a reinforcing layer and a sheath layer, the insulating layer contains 85-90 parts of low-density polyethylene, 1.2-1.5 parts of dicumyl peroxide, 12-15 parts of modified aluminum hydroxide and the like; and the sheath layer contains 42-50 parts of modified chlorinated polyethylene, 28-34 parts of modified aluminum hydroxide and the like. The modified chlorinated polyethylene is prepared through a three-step extrusion reaction, and the modified aluminum hydroxide is subjected to coupling agent treatment, coating modification and carbon nanotube composite modification. The flame-retardant flat flexible large-current cable has prominent advantages, an efficient flame-retardant system is constructed by modified aluminum hydroxide and antimony trioxide, and the V-0 level requirement of UL94 can be met; the flat structure is combined with the modified chlorinated polyethylene, so that the flexibility is excellent and the temperature-resistant range is wide. The design of the insulating layer and the shielding layer ensures excellent electrical performance, segmented temperature control and accurate parameter regulation and control are performed in preparation, stable product quality is ensured, and the device can adapt to a large-current application scene.

The invention relates to the field of cables, and discloses a flame-retardant impact-resistant cable and a preparation process thereof.The cable sheath layer is prepared from low-density polyethylene, nitrile rubber, ethylene-vinyl acetate copolymer, modified halloysite nanotubes and a flame-retardant additive, the preparation method comprises the following steps: carrying out acylating chlorination on 2, 4-dihydroxyphenyl)-2H-benzotriazole, reacting with 3, 5-di-tert-butyl-4-hydroxybenzylamine to prepare a modified acylating chlorination ultraviolet absorbent, and grafting the modified acylating chlorination ultraviolet absorbent with aminated halloysite nanotubes to prepare the ultraviolet absorbent. The aminated halloysite nanotube is prepared by using gamma-aminopropyl triethoxy silane to modify the aminated halloysite nanotube; the flame-retardant additive is prepared from a flame-retardant intermediate obtained by reaction of diphenyl silanediol and phosphorus oxychloride and phosphonitrilic chloride trimer through a precipitation polymerization method. The added modified halloysite nanotube and flame-retardant additive can endow the cable with excellent mechanical properties, aging resistance, flame retardance and heat resistance.

The invention relates to the field of electric wires and cables, and discloses a high-temperature-oxidation-resistant flame-retardant electric wire and cable and a preparation method thereof.The sheath layer of the electric wire and cable comprises low-density polyethylene, nitrile rubber, natural rubber, ethylene-tetrafluoroethylene copolymer, modified multi-walled carbon nanotubes, modified nano titanium dioxide and auxiliaries; the modified multi-walled carbon nanotube is prepared by reacting an acylating chlorination multi-walled carbon nanotube with a polycyclotriphosphazene derivative; the polycyclotriphosphazene derivative is prepared by reacting hexachlorocyclotriphosphazene with p-aminodiphenylamine and then taking diphenyl dihydroxysilane as a linker; the modified nano titanium dioxide is prepared by the following steps: substituting phenylphosphoryl dichloride with phloroglucinol, then sequentially substituting with 3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl chloride and 3-aminopropyltriethoxysilane, and grafting an obtained antioxidant phosphorus-containing coupling agent with nano titanium dioxide. The sheath layer material prepared by the invention has excellent high-temperature oxidation resistance, flame retardance, wear resistance and heat resistance.

The invention discloses an anti-aging light-conversion silver black mulching film and a preparation method thereof, and belongs to the technical field of agricultural polymer films. The preparation method comprises the following steps: S1, mixing low-density polyethylene powder, aluminum paste, a complex light conversion agent, dioctyl phthalate and EVA (Ethylene Vinyl Acetate) to prepare silver light conversion master batches; s2, vinyl-terminated fluorosilicone oil, tert-butyl peroxybenzoate and linear low-density polyethylene powder are stirred for a reaction, and modified low-density polyethylene is obtained; the modified low-density polyethylene, maleic anhydride grafted polyethylene, a multi-effect light stabilizer and polyethylene wax are subjected to banburying granulation, and modified light-stable master batches are obtained; s3, carrying out banburying granulation on the low-density polyethylene powder, the polyethylene powder, carbon black, zinc stearate, ethylene bis-stearamide and the EVA powder to obtain black master batches; s4, blending the silver layer and the black layer, and performing double-layer co-extrusion to obtain the light-conversion silver-black mulching film. The light-conversion silver black mulching film provided by the invention has good mechanical properties and aging resistance.

The invention provides a polyethylene composite film. The polyethylene composite film comprises a surface layer, a middle layer and a heat sealing layer which are sequentially stacked, wherein the surface layer is composed of 58%-76% of hexene copolymerized metallocene linear low density polyethylene, 18%-37% of low density polyethylene and a small amount of slipping agent and anti-blocking agent; the middle layer is composed of 79%-88% of octene copolymerized metallocene medium density polyethylene, 5%-21% of hexene copolymerized metallocene linear low density polyethylene and 6%-15% of high density polyethylene; and the heat sealing layer is composed of 47%-65% of hexene copolymerized metallocene linear low density polyethylene, 33%-45% of low density polyethylene and 2%-5% of a tackifier. According to the composite film disclosed by the invention, through gradient design of each layer of material, the whole composite film has rigidity and toughness, and the composite film is particularly suitable for manufacturing stand-up bag packages which stand stably and are compression-resistant and impact-resistant.

The invention relates to a cable sheath material, and particularly discloses a weather-proof low-smoke halogen-free flame-retardant polyolefin cable sheath material and a preparation method thereof. The cable sheath material is prepared from 30 to 45 parts of low-density polyethylene, 10 to 30 parts of high-impact homo-polypropylene, 15 to 30 parts of graft modified flexibilizer, 30 to 50 parts of main flame retardant, 1 to 5 parts of coupling agent, 10 to 30 parts of phosphorus-nitrogen synergistic flame retardant, 4 to 10 parts of efficient smoke suppressant, 0.2 to 0.8 part of hindered phenol main antioxidant, 0.4 to 1.2 parts of thioester auxiliary antioxidant, 0.4 to 1.0 part of hindered amine light stabilizer, 0.5 to 1.5 parts of ultraviolet light absorber and 2.5 to 2.5 parts of weather resistance enhancer. 5.0 parts of a lubricant, 0.5 to 2.0 parts of a lubricant, and 0.1 to 0.8 part of an anti-copper agent. The mechanical property, the electrical insulation property and the weather resistance of the sheath material are effectively improved, an efficient synergistic flame retardant effect can be obtained, the flame retardant property is excellent, and a finished product can obtain excellent weather resistance, low-smoke zero-halogen property, flame retardant property, mechanical property, electrical insulation property and the like.

The invention relates to the field of cables, and discloses a flame-retardant extruded and insulated low-voltage power cable, which comprises a conductor core, an insulating layer, a filling layer, an inner sheath layer, an armor layer and an outer sheath layer, and is characterized in that the sheath layer is made of low-density polyethylene, ethylene propylene diene monomer, ethylene-tetrafluoroethylene copolymer, modified halloysite nanotubes, modified ammonium polyphosphate and auxiliaries; the modified halloysite nanotube is prepared by loading titanium dioxide on the surface of a halloysite nanotube by using a sol-gel method and then grafting octa-aminopropyl polyhedral oligomeric silsesquioxane; the modified ammonium polyphosphate is prepared by grafting a functional silane coupling agent prepared by reacting a cyclotriphosphazene derivative with 3-chloropropyltrimethoxysilane with polysiloxane-coated ammonium polyphosphate, and the cyclotriphosphazene derivative is prepared by reacting 3-amino-1, 2, 4-triazole with hexachlorocyclotriphosphazene and then coordinating with cobalt ions by adopting a hydrothermal method. Therefore, the material is endowed with good mechanical properties, ultraviolet resistance, heat and wear resistance, flame retardance and antibacterial activity.

A method of converting a polymer including contacting a catalyst with a low-density polyethylene polymer to form a mixture and heating the mixture to a temperature of 200 degrees Celsius (° C.) to 600° C. in a microwave reactor to form a product. The catalyst includes an HZSM-5 zeolite, and 1 weight percent (wt. %) to 10 wt. % gallium and 0.1% to 5 wt. % copper, based on the total weight of the catalyst.

The invention discloses an antibacterial food composite bag and a preparation method thereof, and relates to the technical field of food packaging. The antibacterial food composite bag at least comprises a polyethylene glycol terephthalate outer layer, an aluminum foil middle layer and an antibacterial polyethylene inner layer, the antibacterial polyethylene inner layer comprises the following raw materials in parts by mass: 100 parts of low-density polyethylene, 6-8 parts of a modified halloysite loaded origanum vulgare essential oil antibacterial agent, 1-3 parts of a silver-carbon dot composite antibacterial agent and 5-15 parts of low-density polyethylene grafted acrylic acid; 0.5 to 1.5 parts of an antioxidant; and 0.1 to 0.3 part of an initiator. The modified halloysite loaded origanum vulgare essential oil antibacterial agent and the silver-carbon dot composite antibacterial agent are compounded for use, so that the prepared antibacterial food composite bag has the advantages of wide antibacterial spectrum and long time efficiency, and the shelf life of food can be prolonged.

The invention discloses a low-water-permeability and low-oxygen-permeability photoresist protective film and a preparation method thereof, and relates to the technical field of dry film photoresist protective films, the protective film comprises an inner layer, a middle layer and an outer layer, the inner layer is prepared from 100 parts of low-density polyethylene and 0.1-0.3 part of a release agent, and the middle layer is prepared from 0.1-0.3 part of a curing agent; the middle layer is prepared from 20-80 parts of low-density polyethylene, 10-40 parts of high-density polyethylene, 10-30 parts of a binder, 6-12 parts of modified silicon dioxide and 1-2 parts of an antistatic agent, and the outer layer is prepared from 10-90 parts of low-density polyethylene, 10-40 parts of metallocene low-density polyethylene and 0.1-0.5 part of an anti-sticking agent; according to the invention, excellent water and oxygen double barrier properties are realized, excellent protection can be provided for a dry film photoresist film, the dry film photoresist film has the characteristics of high mechanical strength, static resistance, clean stripping and the like, the process stability and the product yield in chip manufacturing are powerfully guaranteed, and the application value is remarkable.

The invention relates to the field of sheath materials, and discloses an anti-aging sheath material for an electronic wire and a preparation method thereof, the sheath material comprises low density polyethylene, an ethylene-vinyl acetate copolymer, an ethylene-octene copolymer, ethylene propylene diene monomer, a triazine ring derivative, ammonium polyphosphate, modified nano silicon dioxide and an auxiliary agent; according to the triazine ring derivative, N-butyl-2, 2, 6, 6-tetramethyl-4-piperidylamine reacts with cyanuric chloride to prepare a triazine ring monosubstituent, hydrazine hydrochloride is used as a bridging agent to react with the triazine ring monosubstituent, and the triazine ring derivative and piperazine are polymerized to prepare the triazine ring derivative. The modified nano silicon dioxide is prepared by enabling 3-(3, 5-di-tert-butyl-4-hydroxyphenyl) propionyl chloride and 4-propenyloxy-2-hydroxybenzophenone to react, and carrying out free radical polymerization on the reaction product on the surface of the nano silicon dioxide. The synergistic effect of mechanical property, thermo-oxidative aging resistance, ultraviolet aging resistance and flame retardant property is realized.

The invention discloses a high-barrier antibacterial plastic packaging film and a preparation method thereof, belongs to the technical field of film processing, and aims to solve the technical problem that the antibacterial property and barrier property of a plastic packaging film need to be further improved in the prior art. The composite material specifically comprises the following components in parts by weight: 60-80 parts of linear low-density polyethylene, 10-15 parts of a modified compatibilizer, 4-6 parts of a modified antibacterial capsule and 1-3 parts of an auxiliary additive. The preparation method comprises the following steps: oxidizing 2-methyl-2-acrylic acid-2, 2, 6, 6-tetramethyl-4-piperidinyl ester with sodium hypochlorite to obtain a modified precursor, and carrying out free radical polymerization reaction on the modified precursor, low-density polyethylene, glycidyl methacrylate and vinyl heptafluorobutyrate to form a compatibilizer with a block structure. The antibacterial property and barrier property of the plastic packaging film are improved, and the mechanical property of the plastic packaging film is also improved.

The invention relates to the technical field of cable accessories, in particular to a high-strength cable accessory and a preparation method thereof. The high-strength cable accessory comprises a semiconductor layer and an insulating layer, and the semiconductor layer is prepared from, by weight, 10-15 parts of low-density polyethylene, 75-85 parts of polyolefin thermoplastic elastomer, 8-12 parts of ethylene propylene diene monomer, 25-40 parts of silane coupling agent grafted graphene nanosheets and 4-6 parts of maleic anhydride grafted modified ethylene-octylene copolymer. The composition comprises the following components in parts by weight: 1.0-2.0 parts of zinc stearate, 1.0-2.0 parts of an antioxidant, 2.0-3.5 parts of trimethylolpropane trimethacrylate and 1.5-2.2 parts of dicumyl peroxide. According to the high-strength cable accessory provided by the invention, the overall mechanical property, thermal stability and conductivity of the composite material and the mechanical strength, breakdown field strength and insulating property of the insulating layer are improved.

The invention relates to the technical field of metallocene polyolefin materials, and particularly discloses a modified polyolefin film material as well as a preparation method and application thereof. The film material is prepared from the following components in parts by weight: 50 to 70 parts of metallocene linear low-density polyethylene, 20 to 35 parts of ethylene-butyl acrylate copolymer, 15 to 25 parts of polyolefin elastomer, 5 to 15 parts of bio-based degradable polyester elastomer, 3 to 8 parts of reactive compatilizer, 5 to 15 parts of organic modified layered double hydroxide, 8 to 20 parts of composite flame retardant, 0.3 to 1.5 parts of antioxidant and 0.5 to 1.5 parts of lubricant. The preparation method comprises the steps of melt blending, casting extrusion, two-way stretching and the like. The thin film has low hardness, high elongation, low melting point and moderate mechanical strength, the performance of the thin film can accurately meet specific application requirements, and the thin film is particularly suitable for the field of composite fabric of clothes, bags, shoes, hats and the like with high requirements for touch feeling and elasticity.

The invention relates to the field of packaging bags, and discloses an antibacterial composite bag for food and a preparation method thereof, the antibacterial composite bag for food comprises low density polyethylene, a functional additive, modified tetrapod-like zinc oxide whiskers and a lubricant; according to the functional additive, lignin nanoparticles are used as a core, polydopamine is used as a shell, graphene oxide is assembled to prepare a composite material, and gamma-aminopropyltriethoxysilane is used for amination grafting of the composite material. The nano cuprous oxide is loaded on the aminated composite material by adopting a one-step reduction method and reacts with glycidyl dodecyl dimethyl ammonium chloride; the modified tetrapod-like zinc oxide whisker is prepared by coating the surface of the tetrapod-like zinc oxide whisker with silver-doped zinc oxide through a hydrothermal synthesis method, and by adding the functional additive and the modified tetrapod-like zinc oxide whisker, the matrix material is endowed with good mechanical property, antibacterial property, ultraviolet resistance, heat resistance and flame retardance.

The invention discloses a low-smoke halogen-free flame-retardant polyolefin sheath material and a preparation method thereof, and the method comprises the following steps: premixing an ethylene-vinyl acetate copolymer, metallocene linear low-density polyethylene, an ethylene-octene copolymer and a maleic anhydride grafted metallocene linear low-density polyethylene / ethylene-octene copolymer to obtain a premix; adding a flame retardant, an antioxidant and a lubricant, and mixing to obtain a mixture; the mixture is subjected to banburying processing, and a plastic melt is obtained; and carrying out extrusion granulation on the plastic melt to obtain the low-smoke halogen-free flame-retardant polyolefin sheath material. The high flame retardance, smoke suppression and mechanical strength of the sheath material can be improved.

The application provides a perovskite superlattice, a preparation method and application in a nanoscale light emitting diode, and the preparation method comprises the following steps: S1, adding B raw materials, an organic ligand, a cosolvent and an organic polymer C into a solvent, and then heating in a vacuum environment to obtain a precursor 1; S2, adding A raw materials and a cosolvent into a solvent, and then heating in a vacuum to obtain a precursor 2; S3, heating the precursor 1 to a specified temperature in an inert gas atmosphere, mixing the precursor 2 with the precursor 1, and then reducing to room temperature at a set cooling rate, and then standing, centrifuging and cleaning to obtain a nanoscale perovskite superlattice; the organic polymer C is at least one of polymethyl methacrylate, low-density polyethylene, polyethylene, linear low-density polyethylene, polyvinylidene fluoride or isotactic polypropylene. The nanoscale light emitting diode has small size and high light emitting efficiency.

The forms described herein include polymer blends comprising at least 90% by weight of low-density polyethylene (LDPE) polymer; and from 1% to 10% by weight of ethylene acrylate copolymer. The ethylene acrylate copolymer is the polymerized reaction product of: at least 50% by weight of ethylene, based on the total weight of monomers present in the ethylene acrylate copolymer; from 2% to 40% by weight of alkyl acrylate, based on the total weight of monomers present in the ethylene acrylate copolymer; and from 0% to 20% by weight of monocarboxylic acid monomer, based on the total weight of monomers present in the ethylene acrylate copolymer.

This invention relates to the field of polyethylene insulation materials and discloses a polyethylene cable insulation material and its preparation method. The method includes: (1) blending an antioxidant, an anti-scorching agent, and low-density polyethylene by gravity metering, extruding, and then water-cooling and pelletizing to obtain granules; (2) preheating the granules by gravity metering and then sequentially mixing and impregnating them with a peroxide; the anti-scorching agent is 1,1-diphenylethylene and / or 2,4-diphenyl-4-methyl-1-pentene. The method provided by this invention can prepare a polyethylene cable insulation material with anti-scorching properties and high cleanliness. Furthermore, the performance of ultra-high voltage polyethylene cables above 110KV produced using the polyethylene cable insulation material provided by this invention is stable, and the scorching time is longer. Therefore, the polyethylene cable insulation material provided by this invention is suitable for the production of long-cycle cables.

The application belongs to the technical field of precision casting, and particularly relates to a high-viscosity and high-strength precision casting adhesive wax and a preparation method thereof. The adhesive wax comprises the following components: 30-40 parts of paraffin wax, 16-24 parts of microcrystalline wax, 25-30 parts of petroleum resin, 8-14 parts of rosin resin, 5-10 parts of EVA, 2-5 parts of LDPE and 0.1-2 parts of additives; wherein the LDPE is composed of two kinds of LDPE with different melt indexes. By introducing the petroleum resin, rosin resin, ethylene-vinyl acetate copolymer (EVA) and low-density polyethylene (LDPE) into the paraffin wax and microcrystalline wax base system, and controlling the proportion between the resin system and the polyolefin reinforcing system, the adhesive wax has high viscosity and hardness at 100 DEG C, and the bending strength is improved. Thus, the comprehensive performance of the adhesive wax is achieved, i.e., the adhesive wax is not easy to sag at high temperature, is not easy to be pressed at room temperature, and is not easy to crack under stress.

The application discloses a kind of temperature-resistant wear-resistant three-layer insulated wire and preparation method thereof, it is related to cable technical field.The preparation method of the application is: the surface of conductor material is extruded and packed inner layer material to form inner insulation layer, then the surface of inner insulation layer is extruded and packed modified silicone rubber to form middle layer, then the surface of middle layer is extruded and packed outer layer material to form outer insulation layer, and high-temperature-resistant flame-retardant cable material is obtained after curing.In which, inner layer material is made of low-density polyethylene, antioxidant 1010, insulation particle, voltage stabilizer and the like;Modified silicone rubber is made of silicone rubber, boron nitride compound, modified magnesium oxide and the like;Outer layer material is made of inner layer material, boron nitride compound.The introduction of insulation particle, voltage stabilizer, boron nitride compound and the like components effectively improves the high-voltage resistance, aging resistance, wear resistance and temperature resistance of crosslinked polyethylene insulated power cable wire.Therefore, the application has wide application prospect.

The invention belongs to the technical field of metal material surface treatment, and particularly discloses a home appliance color-coated sheet cured by adopting an EB curing technology and a preparation method of the home appliance color-coated sheet. The home appliance color-coated sheet cured by adopting the EB curing technology comprises a hot galvanizing substrate, a UV primer layer, an EB finish paint layer and a protective film, and the protective film is prepared from the following raw materials in parts by weight: 60-65 parts of low-density polyethylene, 12-15 parts of ethylene-vinyl acetate copolymer, 6-9 parts of nano tackifying clay, 3-5 parts of chopped polyurethane fiber, 1-3 parts of antioxidant and 2-4 parts of dispersing agent. According to the protective film, multiple components are synergistically matched, so that the protective film has good mechanical strength, good flexibility, low possibility of brittle failure, high durability, damage resistance, tear resistance, puncture resistance and wear resistance, and can effectively resist scraping and collision of household appliance plates in transportation and installation processes.

The invention belongs to the technical field of packaging materials, and particularly relates to an aluminum foil cover film with high stripping force and high acid resistance and a production process of the aluminum foil cover film. The aluminum foil cover film is formed by sequentially compounding a PET layer, an aluminum foil layer and a film blowing PE layer in a dry mode, the film blowing PE layer is composed of a layer A, a layer B and a layer C which are sequentially connected, and the aluminum foil layer is connected with the layer A through an adhesive; the layer A consists of first linear low-density polyethylene and second linear low-density polyethylene; the layer B is prepared from first linear low-density polyethylene, second linear low-density polyethylene and high-density polyethylene; and the layer C consists of first linear low-density polyethylene, third linear low-density polyethylene and an anti-blocking agent. The aluminum foil cover film prepared by the invention has relatively high stripping force, can effectively prevent layering and bag breaking when being used in a high-temperature and high-humidity environment, and has excellent acid resistance.

The invention discloses a preparation method of an anti-electromagnetic interference and anti-static electronic component cushion packaging material, and belongs to the technical field of electronic component packaging materials. The packaging material sequentially comprises a core layer (60-75%), an electromagnetic shielding layer (10-15%) and an anti-static buffer surface layer (15-25%) from inside to outside, and is prepared through layered preparation and composite molding. The core layer takes low-density polyethylene and the like as base materials, and nano calcium carbonate and the like are added to enhance the buffering property; the electromagnetic shielding layer adopts graphene / silver-plated fiber composite filler, so that the shielding effectiveness is improved; an antistatic agent and a synergistic aid are blended into the surface layer, and the synergistic aid is prepared by reaction of hexamethylene diisocyanate tripolymer and the like, so that the binding force and the functional stability of each layer can be synergistically improved. A finished product is high in shielding effectiveness, low in surface resistance and excellent in impact strength, the shielding effectiveness at the frequency band of 100 MHz to 1 GHz reaches 41 dB or above, the surface resistance is as low as 2.6 * 10 < 7 > omega, the impact strength is 6.0 kJ / m < 2 > or above, electromagnetic radiation, electrostatic discharge and mechanical impact can be comprehensively resisted, and the strict protection requirement for storage and transportation of electronic elements is met.

The invention discloses a PE composite freshness protection package for preventing and controlling cold chain temperature loss and a preparation method and application thereof.The freshness protection package is a polyethylene film of a three-layer co-extrusion composite structure and sequentially comprises a heat insulation layer A, a gas adjusting layer B and a dehumidification layer C from outside to inside, the heat insulation layer A is formed by blending low-density polyethylene LDPE and heat insulation functional filler, and the gas adjusting layer B is formed by blending low-density polyethylene LDPE and heat insulation functional filler; the gas adjusting layer B is formed by blending linear low density polyethylene LLDPE and a gas adsorption adjusting functional filler; the dehumidification layer C is formed by blending low-density polyethylene (LDPE) and a moisture absorption functional filler; the preparation method of the PE composite fresh-keeping bag for preventing and controlling the cold chain temperature dropping damage comprises the following steps: (1) preparing the functional master batch; (2) three-layer co-extrusion film blowing; and (3) post-treatment. The invention further discloses application of the PE composite preservation bag in perishable fruit and vegetable packaging. The system has the advantages of active prevention and control, multifunctional cooperation, intelligent adjustment, processing technology advancement and reliability, safety, environmental protection and the like.

This document discloses feminine hygiene products and multilayer membrane structures. According to one or more embodiments disclosed herein, a feminine hygiene product may include a feminine sanitary pad comprising an absorbent body, an adhesive layer located on at least one surface of the absorbent body, and a pouch package in contact with the adhesive layer of the feminine sanitary pad. The pouch package may include a release layer in direct contact with the adhesive layer. The release layer may comprise a polymer composition comprising low-density polyethylene covalently bonded to polydimethylsiloxane.

The invention provides an application of 2-allyloxy thioxanthone as a voltage stabilizer in a cable, an electric-dendronization-resistant insulated cable material containing the 2-allyloxy thioxanthone, and an insulated cable comprising an insulating layer prepared from the electric-dendronization-resistant insulated cable material. The electrical dendronization-resistant insulated cable material is prepared from the following components in parts by weight: 100 parts of low-density polyethylene, 0.2 to 2 parts of a voltage stabilizer 2-allyloxythioxanthone, 0.15 to 0.5 part of an antioxidant and 1.5 to 2.5 parts of a cross-linking agent. The voltage stabilizer inhibits electrical dendronization, the alkane chain of the voltage stabilizer enhances the interaction between the voltage stabilizer and polyethylene, improves the compatibility and reduces the emigration rate, in addition, the double-bond structure of the voltage stabilizer can realize synchronous completion of crosslinking and grafting in the chemical crosslinking process, the migration of the stabilizer can be further avoided, and the crosslinking efficiency of the stabilizer can be improved.