542 results about "Electron beam irradiation" patented technology

The invention relates to the technical field of regeneration of waste polyester, in particular to a polyester micro-plastic recycling and impurity removing method and equipment. According to the method, the irradiation technology is adopted for treating the polyester micro-plastic, the polyvinyl chloride is removed by combining electron beam irradiation with the specific gravity method, the radiation dosage and time are accurately controlled, the polyvinyl chloride in the polyester micro-plastic can be effectively removed, the color of the polyester micro-plastic is not affected, and the treated polyester micro-plastic can meet the spinning requirement. The equipment is used for realizing the impurity removal method and comprises irradiation treatment equipment, a separation tank, a cleaning tank, a dehydrator and a drying tower. The equipment is simple in structure and convenient to operate, the radiation dosage and time can be accurately controlled in the impurity removal process, the surface temperature of the polyester micro-plastic is effectively controlled, and production and popularization are easy.

The invention relates to a focused ion beam ultrathin section sample preparation pretreatment method for a wafer sample, and belongs to the technical field of wafer material microscopic experiments. The wafer sample preparation pretreatment method provided by the invention comprises the following steps: (1) depositing a metal oxide on the surface of a wafer sample by adopting an atomic layer deposition technology to obtain an ALD layer; (2) coating a curing glue solution on the surface of the ALD layer, and curing to obtain a curing glue layer; and (3) plating a conductive protection layer on the surface of the cured adhesive layer to finish sample preparation pretreatment. The sample preparation pretreatment method disclosed by the invention can well solve the problems of irradiation damage and deformation of a fine structure which is not resistant to electron beam irradiation, curtain effect in a cutting process, unobvious structural boundary in a shooting process and the like in focused ion beam ultrathin section sample preparation, and has good application prospects in the technical field of wafer material microscopic experiments. And the practical value is very high.

The invention discloses a postharvest mango preservation method based on chitosan, citric acid and electron beam irradiation, and the method specifically comprises the following steps: dissolving chitosan with the deacetylation degree of more than or equal to 85% in a 0.7-0.8% citric acid solution, and adjusting the pH value to 4.4-4.6 to prepare a film coating solution; the method comprises the following steps: dipping mangoes, drying to form a continuous coating film, packaging, carrying out 380-440Gy double-sided irradiation treatment, and finally storing in a storage environment with the temperature of 11 + / -1 DEG C and the humidity of 85 + / -5%. According to the method, through synergistic antibiosis of chitosan and citric acid, low-dose irradiation precise sterilization and low-temperature microenvironment regulation and control, the rotting rate and browning degree of the harvested mangoes are effectively reduced, the storage period is prolonged, the fruit hardness, vitamin C and other nutritional ingredients are maintained, and the method is suitable for large-scale postharvest preservation and long-distance storage and transportation of the mangoes.

The invention discloses a method for treating a polyvinyl alcohol modified high-wettability diaphragm for a lithium ion battery through electron beam irradiation. The method mainly comprises two parts, namely preparation of a grafted monomer solution and electron beam irradiation treatment. The method comprises the following specific operation steps: (1) dissolving polyvinyl alcohol in deionized water to prepare a grafted monomer solution; (2) immersing the polypropylene diaphragm which is subjected to ultrasonic cleaning and fully dried into the grafting monomer solution, and uniformly soaking; and (3) carrying out electron beam irradiation treatment on the soaked diaphragm and the grafted monomer solution, then cleaning with deionized water, and drying. According to the preparation method disclosed by the invention, collaborative optimization of surface chemical modification and porous structure integrity is realized by grafting polyvinyl alcohol and accurately controlling the irradiation dose, and the diaphragm with high wettability and high thermal stability is designed under the combined action of a polar functional group contained in a monomer and an active site obtained by irradiation; and a new technical approach is provided for developing a high-performance lithium ion battery diaphragm.

The invention relates to a method for preparing a high-conductivity graphene / copper composite material based on electron beam irradiation. The method comprises the following steps: S1, growing a graphene film on the surface of a copper foil through a chemical vapor deposition method; and S2, carrying out electron beam irradiation treatment on the graphene / copper foil. The conductivity of the graphene / copper composite material prepared through the method can reach 109.3% IACS and is obviously higher than that of pure copper; in addition, the method is good in process repeatability, and can be reproduced in electron beam exposure equipment of different models through verification.

The invention discloses a preparation method of a defective graphene negative electrode for a lithium battery, which comprises the following steps: grinding natural graphite into powder, carrying out graphite modification by irradiation of a high-current pulse electron beam, mixing with a conductive agent and a binder to prepare slurry, and coating the slurry on a metal foil to prepare the defective graphene negative electrode for the lithium battery. Natural graphite is modified through high-current pulse electron beam irradiation, obvious expansion deformation occurs on the surface of the natural graphite, defects are generated on a graphite structure, mutual stripping between graphite layers is achieved, the whole surface of the graphite is in a hairy wrinkle form, the structure is almost transparent, and the storage capacity and the cycling stability are obviously improved; the obtained defective graphene negative electrode material provides more channels for lithium ion diffusion, the ion diffusion path is effectively shortened by internal gaps, and a physical method is adopted, a specific reducing agent, an oxidizing agent or other intermediate media do not need to be used, and introduction of impurities is avoided.

The invention discloses a bismuth telluride nanopore maskless direct writing preparation method based on electron beam irradiation, and belongs to the technical field of nanometer manufacturing. The method comprises the following steps: firstly, constructing an initial nanopore in a two-dimensional bismuth telluride material by utilizing a converged electron beam; and then the aperture size of the nanopore is accurately regulated and controlled by adjusting the beam density of the electron beam. The method effectively solves the key technical bottlenecks of interface chemical residue pollution caused by a traditional photoresist mask process, intrinsic defect formation caused by high-energy particle bombardment and the like, and breaks through the limitation of an existing etching technology in the aspect of sub-nanoscale structure precision control; precise control of the aperture of the nanopore can be achieved by adjusting the irradiation intensity of the electron beam, and the method has the advantages of being easy and convenient to operate, low in cost, environmentally friendly and the like and can be widely applied to the fields of nanometer electronic devices, sensors and the like.

The invention provides a method for extracting polyphenol from persimmon peel and application, the method comprises the steps of persimmon peel pretreatment, irradiation treatment, subcritical ethanol extraction and extraction of polyphenol in different forms, and the method belongs to the technical field of natural product extraction methods. According to the method, electron beam irradiation is utilized to treat persimmon peels, high energy in electron beams can bombard components such as cellulose and lignin in cell walls of the persimmon peels, tightly-combined chemical bonds are broken, ethanol in a subcritical extraction technology can permeate into the persimmon peels to extract polyphenol substances, and therefore the extraction efficiency of polyphenol is improved; and the consumption of the solvent in the extraction process can be reduced. Different forms of polyphenols are further extracted on the basis of the persimmon peel polyphenol crude extract, the polyphenol has good antioxidant capacity and alpha-glucosidase inhibitory activity, bioactive compounds in persimmon peel can be efficiently recycled, and future waste utilization and development of natural antioxidants are promoted.

The invention relates to the technical field of power cables, and discloses a manufacturing process of a flame-retardant anti-rat-bite cable, which comprises the following steps: step S1, mixing and granulating in an inert atmosphere; step S2, conductor pretreatment; step S3, carrying out multi-layer co-extrusion coating; s4, gradient cooling and interface strengthening are carried out, and the co-extruded cable passes through a three-section type cooling tank in sequence to be cooled; and after cooling, carrying out electron beam irradiation crosslinking treatment on the cable immediately. The cable comprises a flame-retardant sheath layer, a long-acting rat-bite-proof layer, an insulating layer and a conductor from outside to inside. According to the invention, capsaicin is coated in a gelatin-Arabic gum composite capsule wall through a microencapsulation technology to form a physical isolation barrier, and the structure effectively prevents the contact between the repellent and the external environment, so that even in high-temperature mixing and long-term use, volatile components can be prevented from escaping, and the slow release period of the effective components is ensured to cover the design life of the cable.

The invention discloses a silane-crosslinked low-smoke halogen-free flame-retardant oil-resistant polyolefin cable material and a preparation method thereof. The method comprises the following steps: preparing a bio-based polyesteramide toughening phase which is pre-polymerized by castor oil-based polyamide and poly (butylene adipate-co-terephthalate) and is terminated by itaconic anhydride; the preparation method comprises the following steps: self-assembling phytic acid and melamine to wrap ammonium polyphosphate, so as to prepare supramolecular flame-retardant gel powder; the method comprises the following steps: grafting aramid pulp fibers by using a phosphorus-containing silane coupling agent to prepare a reactive liquid crystal reinforced phase; the preparation method comprises the following steps: blending and banburying the components with a hydrogenated styrene-isoprene-styrene block copolymer, an antioxidant and a peroxide cross-linking agent, carrying out dynamic vulcanization and interface bonding, and carrying out extrusion and electron beam irradiation to finally crosslink. An interpenetrating-topology network structure is formed in the prepared cable material, the crosslinking degree is larger than or equal to 82%, and the cable material is rapid in crosslinking, excellent in oil resistance, low in smoke and free of toxicity and is particularly suitable for super high-rise building hanging cables, deep sea exploration cables and new energy automobile liquid cooling cables.

The invention discloses a preparation method and application of a functionalized hydrogen bond organic framework material induced by high-energy electron beam irradiation, and belongs to the technical field of new environmental detection materials.The preparation method comprises the steps that europium salt and a hydrogen bond organic framework material are added into an aqueous solution and stirred to be uniform, and the mixed solution is irradiated through high-energy electron beam irradiation to obtain the functionalized hydrogen bond organic framework material. And centrifugally cleaning the mixed solution subjected to high-energy electron beam irradiation with ethanol to obtain the high-energy electron beam irradiation induced functionalized hydrogen bond organic framework material. The preparation method of the functionalized hydrogen bond organic framework material induced by high-energy electron beam irradiation has the advantages of relatively simple operation, low cost, large-scale preparation and the like; the high-energy electron beam irradiation induced functionalized hydrogen bond organic framework material prepared by the invention has the characteristics of double emission peaks and self-calibration detection; the high-energy electron beam irradiation induced functionalized hydrogen bond organic framework material prepared by the invention shows stable optical properties; the high-energy electron beam irradiation induced functionalized hydrogen bond organic framework material prepared by the invention can better detect thorium in deionized water through a resonance energy transfer effect and an internal filtering effect.

The invention relates to the field of fertilizers, in particular to a method for preparing an organic fertilizer by anaerobic fermentation of tylosin dregs, which comprises the following steps: (1) electron beam irradiation treatment; (2) adding the mushroom dreg powder into an ethanol solution, and treating with a coupling agent KH-550 to obtain aminated mushroom dregs; (3) preparing to obtain phosphorylated hydroxypropyl methyl cellulose; (4) mixing the aminated mushroom dregs and the phosphorylated hydroxypropyl methyl cellulose in an organic solvent for reaction to obtain phosphorylated hydroxypropyl methyl cellulose composite active mushroom dregs; and (5) composting to finally obtain the organic fertilizer. According to the organic fertilizer and the preparation method thereof, the tylosin mushroom dregs are subjected to modification treatment, anaerobic fermentation treatment and aerobic fermentation treatment, so that the content of antibiotic tylosin in the finally prepared organic fertilizer is greatly reduced, the industrial requirements can be met, the content of organic matters in soil can be increased, the soil structure can be improved, and the soil fertility can be improved; the plant growth is facilitated.

The invention provides a water treatment method for generating singlet oxygen based on electron beam irradiation, belongs to the technical field of water treatment, and aims to provide a universal singlet oxygen generation method for a water treatment process, the method comprises the following steps: adding a metal salt into sewage to be treated, and uniformly stirring to obtain a mixed solution; wherein the metal salt comprises reducing metal ions; continuously aerating air into the mixed solution, so that the mixed solution is rich in oxygen; and carrying out electron beam irradiation on the mixed solution rich in oxygen, so that the reducing metal ions cooperate with the electron beam irradiation to activate the oxygen in the mixed solution to generate singlet oxygen, and removing new pollutants in the sewage to be treated.

The invention discloses a high-flame-retardant long-life electric wire and a preparation method thereof. The electric wire comprises a conductor, an inner insulating layer and an outer insulating layer, the inner insulating layer comprises a catalytic char-forming type flame retardant A, the outer insulating layer comprises a heat-insulating barrier type flame retardant B, the conductor is coated with the inner insulating layer and the outer insulating layer in a co-extrusion mode, synchronous high-energy electron beam irradiation crosslinking is achieved, the flame retardant A and the flame retardant B are quantitatively added into the insulating layers, and the flame retardant A and the flame retardant B are added into the insulating layers. A synergistic flame-retardant effect is generated at a high temperature, heat overload generated by conductor resistance and combustion caused by an external fire source are efficiently inhibited, and the high-flame-retardant and long-service-life electric wire is provided.

The invention relates to the field of photovoltaic adhesive films, and discloses an anti-migration long-service-life light conversion adhesive film and a preparation method and application thereof.The anti-migration long-service-life light conversion adhesive film comprises a light conversion layer, an anti-migration layer and a UV cut-off layer which are sequentially arranged in an attached mode; the raw materials of the light conversion layer comprise first matrix resin and a light conversion agent; the raw materials of the anti-migration layer comprise second matrix resin and inorganic nano powder; the particle size D50 of the inorganic nano powder is 1-200nm, and the mass of the inorganic nano powder is 0.01-0.5% of the total mass of the anti-migration layer; the anti-migration layer is pre-crosslinked through electron beam irradiation; the raw materials of the UV cut-off layer comprise third matrix resin and an ultraviolet absorbent. The anti-migration layer added with the inorganic nano powder and pre-crosslinked through electron beam irradiation is arranged between the light conversion layer and the UV cut-off layer, the free volume of a crosslinked polymer can be effectively reduced by adding the inorganic nano powder and carrying out electron beam irradiation pre-crosslinking, and a migration channel of an auxiliary agent is blocked; mutual migration of the light conversion agent and the ultraviolet absorbent is effectively prevented.

The invention belongs to the related technical field of additive manufacturing, and discloses an electron beam melting wire liquid nitrogen copious cooling additive manufacturing method and system.The method comprises the steps that in the electron beam melting printing forming process, liquid nitrogen is sprayed to a molten printing wire under electron beam irradiation, and the liquid nitrogen is sprayed to the molten printing wire; the molten printing wires are subjected to nitridation reaction under the action of electron beams while being subjected to liquid nitrogen cryogenic cooling, so that the crystal structure of a formed part is regulated and controlled, and the mechanical performance is enhanced; and / or liquid nitrogen is sprayed to the printing wire material which begins to be solidified, so that the printing wire material is subjected to liquid nitrogen deep cooling, and the crystal structure of the formed part is regulated and controlled to achieve mechanical property enhancement. Liquid nitrogen is introduced into the electron beam additive manufacturing device for deep cooling, the extruded printing wire is solidified at an extremely high cooling speed after being melted, a large number of homogeneous nucleation sites are formed in a melting area due to the high supercooling degree, the solidification speed is high, a microstructure is customized into uniform and fine equiaxed crystals, the strength and toughness of the material are improved, and the production cost is reduced. The mechanical property is improved.

The invention discloses a method for preparing methane by reforming small molecular alcohol through high-energy electron beam irradiation, and belongs to the technical field of environmental catalysis. According to the method, methane is prepared by reforming small molecular alcohol through high-energy electron beam irradiation. Compared with a traditional biological method, high-energy electron beam irradiation is adopted, substances are irradiated by electron rays accelerated in a high-voltage electric field, molecules of various substances are ionized and excited through interaction of high-energy electrons and the substances, and therefore chemical reactions are initiated. The method disclosed by the invention has a better irradiation methane preparation effect, and the problems of long reaction period (15-30 days), high energy consumption of a preparation process, large carbon emission and the like in the prior art are solved.

The invention discloses a moisture-absorbing, antibacterial and deodorizing polyester fiber fabric and a preparation method thereof, belongs to the technical field of fiber fabric preparation, and aims to solve the technical problem that the antibacterial and deodorizing performance and moisture-absorbing performance of a polyester fiber fabric in the prior art need to be further improved. The preparation method specifically comprises the following preparation steps: adding the polyethylene glycol terephthalate, the antibacterial modified filler and the auxiliary additive into a double-screw extruder, and carrying out melt spinning to obtain the antibacterial polyester fiber. The antibacterial modified filler is prepared, the filler and polyethylene glycol terephthalate are blended, melted and spun, antibacterial polyester fibers are prepared, quaternary ammonium salt type antibacterial monomers and sulfonate type hydrophilic monomers are grafted through alkalization treatment and the electron beam irradiation technology, the antibacterial and deodorization performance of the fiber fabric is improved, and the antibacterial and deodorization functions of the fiber fabric are improved. The moisture absorption performance is also improved.

An object is to provide a creation method of detection data used for an electron beam applicator itself to output detection data created with effective use of a grayscale range. The creation method of detection data includes at least two times of detection data output steps. The first detection data output step includes: a first electron beam irradiation step; a first detection step of generating a detection signal; a first light amount adjustment step; a step of repeating these steps; and a first output step. The second detection data output step includes: a first histogram calculation step; a second detection condition setting step; a second electron beam irradiation step based on the set second detection condition; a second detection step of generating a detection signal; a second light amount adjustment step; a step of repeating the above steps; and a second output step.

The invention provides electronic-grade quartz glass fiber cloth and a preparation method thereof. The method comprises the following steps: selecting high-purity quartz sand, melting at high temperature, precisely filtering, and homogenizing; preparing a special impregnating compound; drawing fibers through a platinum-rhodium alloy bushing and coating the fibers with an impregnating compound; weaving into a cloth blank; performing high-temperature sintering treatment; the electrical property is improved through electron beam irradiation treatment; and cleaning with ultrapure water and drying to ensure the electronic grade cleanliness. According to the invention, high purity, uniformity and excellent electrical properties of the electronic-grade quartz glass fiber cloth can be ensured, and the requirements of the electronic industry on high-performance materials are met.

The invention relates to the technical field of high polymer materials, and discloses a low-smoke halogen-free irradiation crosslinking polyolefin cable sheath material and a granulation process thereof, the raw materials comprise an ethylene-vinyl acetate copolymer, an ethylene-octylene copolymer, an epoxy group-containing terpolymer and functionalized composite powder, the powder system superfine aluminum hydroxide is subjected to high-temperature grafting through vinyl silane, after cooling, an active coating layer is constructed by zinc methacrylate, active magnesium oxide and a lubricant, and the process adopts matrix resin main feeding, powder side feeding and low-temperature low-shear extrusion, and is subjected to air-cooled die surface hot cutting and electron beam irradiation crosslinking forming. The covalent bond and ionic bond synergistic enhancement mechanism is utilized, the contradiction between mechanical property loss and processing rheological property deterioration is solved under the high filling amount of 137-160 parts, the active components are effectively prevented from being scorched in the early stage, and the material is endowed with excellent tensile strength, elongation at break and surface quality.

The invention belongs to the technical field of metal packaging tin making, and discloses a laminated iron product prepared from full-solid-content electron beam curing glue. The product comprises the following components in parts by weight: 50-90 parts of polybutadiene polyurethane acrylate, 3-25 parts of organic silicon polyurethane acrylate, 0.1-1.5 parts of an auxiliary agent and 5-15 parts of a polyfunctional group acrylate diluent. The specific preparation method of the product comprises the following steps: S1, preparing process aspect; s2, a coating link; s3, fitting characteristics; s4, curing mode; s5, performance expression; and S6, controlling bond fracture and new bond generation under electron beam irradiation. By the adoption of the full-solid-content gluing technology, the coating is a single-component product, easy and convenient to operate, non-toxic, safe, capable of being coated at the normal temperature or heated to 60 DEG C, free of VOC emission in the whole process, environmentally friendly, capable of saving energy, capable of bringing brand new development opportunities to related industries, representative of a novel curing technology, wide in prospect and worthy of being widely applied.

The invention discloses a sodium manganate mesoporous silicate composite material for adsorbing cesium ions in radioactive wastewater as well as a preparation method and application thereof, and relates to the field of radioactive wastewater treatment.The sodium manganate mesoporous silicate composite material is prepared by dissolving NaMoO4.H2O and CSN2H4 in deionized water respectively, stirring, carrying out a hydrothermal reaction, washing, drying and carrying out electron beam irradiation to obtain ball-flower-shaped MoS2; the preparation method comprises the following steps: dissolving sodium manganate / MoS2 in deionized water, dissolving flower-ball-shaped MoS2 and Na2SiO3. 9H2O in deionized water, carrying out ultrasonic treatment, dissolving (CH3COO) 2Mn. 4H2O in deionized water, mixing, stirring, carrying out a hydrothermal reaction, cooling, washing, drying and grinding to obtain the sodium manganate / MoS2 composite material. The composite material disclosed by the invention has good adsorption performance on cesium ions, is suitable for treating radioactive wastewater, still shows excellent selective adsorption capacity under different pH conditions and an environment in which multiple metal cations coexist, and has a wide application prospect.

To provide a transmission electron microscope, which can analyze a sample over a wide range and with high resolution.SOLUTION: A transmission electron microscope includes: an irradiation section that can irradiate a sample with a parallel electron beam at a predetermined incident angle; a sample holding section that can hold the sample; an aperture section that is located downstream in a traveling direction of the electron beam transmitted the sample or scattered by the sample, and that has an opening; an image forming lens that is located downstream in the traveling direction of the electron beam with respect to the opening of the aperture section and that forms an image of the electron beam selected by the aperture section; an image capturing section that is located downstream in the traveling direction of the electron beam with respect to the image forming lens, that captures a bright-field image and a dark-field image formed by the image forming lens, and that has an imaging surface; and an analysis section that analyzes the sample on the basis of the bright-field image and the dark-field image.SELECTED DRAWING: Figure 1

The invention discloses a hydrophobic high-CTI high-strength polyphenylene sulfide composite material and a preparation method thereof.The material is prepared from, by mass, 20-50 parts of polyphenylene sulfide, 20-40 parts of glass fibers, 0.2-2 parts of a coupling agent, 20-40 parts of a carbonization inhibitor, 5-12 parts of modified montmorillonite, 0.2-6 parts of reactive silicone oil and 0.5-2 parts of a lubricant. And carrying out melt blending extrusion granulation and then carrying out electron beam irradiation so as to obtain the hydrophobic high-CTI high-strength polyphenylene sulfide composite material. The obtained material has good mechanical properties, and has a CTI (Comparative Tracking Index) value exceeding 600V.

A method for testing a packaging substrate with at least one electron beam column is described, wherein the packaging substrate is a panel level packaging substrate or an advanced packaging substrate. The method includes placing the packaging substrate on a stage in a vacuum chamber; directing at least one electron beam of the at least one electron beam column on at least a first portion of the packaging substrate; directing the at least one electron beam of the at least one electron beam column on at least a second portion of the packaging substrate; detecting signal electrons emitted upon impingement of the at least one electron beam for testing a first device-to-device electrical interconnect path of the packaging substrate; and illuminating at least a third portion of the packaging substrate with UV radiation.

The invention belongs to the technical field of sewage treatment, and particularly relates to a method for degrading organic pollutants. The method for degrading the organic pollutants disclosed by the embodiment of the invention comprises the following steps: carrying out electron beam irradiation on sewage containing the organic pollutants, and carrying out aeration treatment at the bottom of the sewage, and the gas adopted by the aeration treatment is air. According to the method, the electron beam irradiation technology and the bottom aeration treatment are combined, high-molecular organic pollutants can be efficiently degraded, so that the organic pollutants are thoroughly degraded to reach the emission standard, and the method has the advantages of low cost, good economy, no newly-added dangerous waste and salinity risk and the like, and is very suitable for sewage treatment.

The invention belongs to the technical field of fiber preparation, and relates to a high-performance silicon carbide ceramic fiber membrane and a preparation method thereof. The silicon carbide ceramic fiber membrane is prepared from phenylboronic acid or a derivative thereof and an organosilicon polymer as raw materials through the steps of spinning, electron beam irradiation non-melting, sintering and high-temperature sintering. The preparation method of the silicon carbide ceramic fiber membrane provided by the invention has the characteristics of simplicity and high efficiency, and the prepared ceramic fiber membrane has excellent wave absorption and high temperature resistance, and has important application value in the fields of aviation, aerospace, national defense, energy and the like.

The invention relates to the field of power cables, and particularly discloses an acid and alkali resistant waterproof power cable. The acid and alkali resistant waterproof power cable comprises a conductor layer, an insulating layer and a sheath layer which are sequentially arranged from inside to outside, the preparation method comprises the following steps: S1, preparing the conductor layer: smelting electrolytic copper, tin, silver and rare earth elements, and then performing wire drawing, and controlling the wire drawing speed to be 10-15m / s to obtain a conductor wire core; s2, extrusion of an insulating layer: mixing fluororubber, epichlorohydrin rubber, nano-silica and a flame retardant, and extruding the mixture at 70-90 DEG C by a twin-screw extruder to coat the conductor layer; s3, extruding a sheath layer: mixing the raw materials, and coating the raw materials outside the insulating layer at 60-85 DEG C by a single screw extruder; s4, irradiation crosslinking: carrying out electron beam irradiation on the coated cable; and S5, cooling and rolling. The cable can be used in a highly corrosive environment, and has the advantage of avoiding premature failure of the sheath layer of the power cable in the highly corrosive environment.

The invention is suitable for the technical field of heat shrink films, and provides a polyolefin cross-linked heat shrink film for fresh food packaging and a preparation method thereof.The heat shrink film is prepared from co-polypropylene, polyethylene, metallocene polypropylene, ethylene-octylene copolymer and a processing assistant.The invention further provides the preparation method of the heat shrink film. A five-layer or more-layer co-extrusion three-bubble method synchronous stretching production process is adopted, electron beam irradiation crosslinking is adopted, and the polyolefin crosslinking heat shrinkage film for fresh food packaging provided by the invention adopts a method of blending modification of low-softening-point elastomers such as metallocene polypropylene and POE, so that the shrinkage stress and initial shrinkage temperature of the film are reduced; a three-bubble method production process is adopted, the performance of the film is improved, crystal overgrowth is inhibited through a rapid cooling process, transparency and shrinkage uniformity are improved, and the mechanical property and thermal shrinkage of the film are improved through electron beam irradiation crosslinking.