1035 results about "Low density" patented technology

The invention belongs to the technical field of metal material engineering, and relates to a light high-toughness low-cost aluminum alloy and a preparation method thereof.The alloy comprises, by mass, 7.0%-9.2% of Mg, 2.5%-4.0% of Zn, 0.06%-0.20% of Zr, 0.01%-0.03% of Sb, main impurities including Fe smaller than or equal to 0.15%, Si smaller than or equal to 0.12%, other single impurities smaller than or equal to 0.05%, the total impurity smaller than or equal to 0.15% and the balance Al. Compared with 2xxx series and 7xxx series aluminum alloys, the alloy has certain advantages in the aspects of density, specific strength, ductility, corrosion resistance and the like, and has a remarkable cost advantage compared with a low-density aluminum-lithium alloy, so that the core competitiveness of an alloy product is improved, and the alloy product has the potential of becoming a next-generation commercial aluminum alloy.

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 invention discloses a tin-based alloy preformed soldering lug and a preparation method thereof.The preparation method comprises the following steps that a copper fiber reinforced framework with gradient density distribution is prepared, the copper fiber reinforced framework comprises a high-density area and a low-density area, and hollowed-out gaps are formed through a weaving technology; tin-based slurry with different components and functions is prepared from outer-layer slurry with tin-antimony-copper-nickel as a main body, middle-layer slurry with tin-antimony-copper as a base body and inner-layer slurry with tin-antimony-copper rare earth as a base body, the three kinds of tin-based slurry are sequentially filled into preset areas of hollow-out gaps of a reinforced framework, and a gradient structure material is formed; the gradient structure material is subjected to press-fit forming and post-treatment, and a preformed soldering lug is obtained; a framework is firstly built, then materials are filled, and copper fibers in the soldering lugs provide good support and heat conduction channels, so that a gradient transition structure with continuous change of components and performance is realized, and the integrity, the impact resistance and the bonding strength of the materials are greatly enhanced.

The invention discloses an Al-Mg-Zn aluminum alloy plate with excellent strong plasticity and light weight characteristics as well as a preparation method and application of the Al-Mg-Zn aluminum alloy plate. The alloy comprises the following components in percentage by mass: 5.0%-5.5% of Mg, 1.5%-2.0% of Zn, 0.4%-0.5% of Mn, 0.1%-0.3% of Cu, 0.15%-0.25% of Sc, 0.1%-0.15% of Zr, 0.05%-0.15% of Ag, less than or equal to 0.1% of impurities and the balance of Al. The density is not more than 2.63 g / cm < 3 >, the tensile strength is not less than 470 MPa, and the ductility is not less than 23%. The preparation method comprises the steps of high-purity raw material smelting and casting, two-stage homogenization, hot rolling, intermediate annealing, cold rolling, solid solution treatment and single-stage aging. Wherein the total pressing amount of hot rolling is 80-85%, the total pressing amount of cold rolling is 20-35%, and the single-stage aging time is 120-140 DEG C * 16-24 h. The microstructure of the alloy is characterized in that the average size of dispersed AlSc particles is smaller than or equal to 100 nm, the area fraction of deformed grains is larger than or equal to 70%, the average size of nanometer beta-AlMg and T-Mg (Al, Zn) composite precipitated phases is smaller than or equal to 20 nm, the number density is larger than or equal to 1 * 10 < m >, the area fraction of micron-order second phases is smaller than or equal to 0.5%, and the alloy is only formed by impurity Fe. According to the method, the traditional two-stage aging process is simplified, low density, high strength and high plasticity are synchronously improved, and the method is suitable for large-scale industrial application.

The invention discloses a preparation method of a high-temperature-resistant wave-absorbing honeycomb sandwich structure in the technical field of wave-absorbing materials, which comprises the following steps: synthesizing a transition metal modified polycarbosilane precursor under the protection of inert gas, and performing high-temperature cracking to obtain a magnetic silicon carbide wave-absorbing agent; blending and grinding the wave-absorbing agent and high-temperature-resistant resin to prepare a wave-absorbing glue solution; after a honeycomb core material is formed by adopting inorganic fiber cloth, a wave-absorbing glue solution is loaded through a repeated dipping-drying process, and the high-temperature-resistant wave-absorbing honeycomb is obtained through gradient heat treatment. And finally, compounding and curing with the wave-transparent skin and the carbon fiber composite material through a high-temperature-resistant adhesive film. The sandwich structure is prepared on the basis of the composite material, and the magnetic silicon carbide wave-absorbing agent has the characteristics of high temperature resistance, low density, oxidation resistance and adjustable dielectric property; the phthalocyanine resin matrix is adopted, so that excellent formability and high-temperature stability are guaranteed; honeycomb nodes are sewn and reinforced by silicon carbide fibers, so that the problem of node cracking in a high-temperature environment is solved.

The invention provides a phase change enhanced ablation-resistant modified liquid silicone rubber material as well as a preparation method and application thereof, and belongs to the field of advanced materials. According to the invention, paraffin is adopted as a phase change filler, so that the ablation resistance and heat insulation performance of the expanded ceramic liquid silicone rubber material are remarkably improved, and the prepared silicone rubber composite material has the advantages of low density, low ablation surface temperature, strong carbon layer and high heat absorption capacity. The phase-change reinforced modified expanded ceramic flexible ablation-resistant material further improves the ablation resistance and high-temperature heat insulation performance of a liquid silicone rubber material, and has a good application prospect in the fields of aerospace thermal protection, building heat insulation and the like.

The invention provides a high-strength fiber composite material based on aramid 1414 fibers and a preparation method of the high-strength fiber composite material, and belongs to the technical field of composite materials. The composite material comprises 60%-80% of aramid 1414 fibers and 20%-40% of a resin matrix, the aramid 1414 fibers are subjected to surface treatment and size stabilization treatment through a specific process, and the compatibility of the fibers and the resin matrix and the overall performance of the composite material are fully improved. According to the invention, the characteristics of high strength and high modulus of the aramid 1414 fiber are utilized, so that excellent mechanical properties are provided; due to the low-density characteristic of the aramid 1414 fibers, the composite material is light while high strength is kept, and the performance requirements of light weight and high strength are met. The composite material disclosed by the invention not only has excellent mechanical properties, but also realizes the balance of cost effectiveness and production efficiency by optimizing a preparation process, and has a wide market application prospect.

The invention provides a low-density high-strength aluminum-based composite material and a preparation method, and relates to the technical field of aluminum alloy powder metallurgy preparation. The composite material is composed of two parts: a matrix alloy and hollow glass beads, wherein the addition amount of the hollow glass beads is 5-30 wt.%. The matrix alloy comprises the following components in percentage by mass: 0 to 6.0 percent of Cu, 0 to 3.0 percent of Mg, 0 to 8.4 percent of Zn and the balance of Al and inevitable impurities; the hollow glass beads are prepared from the following components in percentage by mass: 70 to 80 percent of SiO2, 8 to 15 percent of CaO, 5 to 15 percent of Na2O, 3 to 8 percent of B2O3 and 2 to 3 percent of Al2O3. The composite material is prepared through surface modification of hollow glass beads, preparation of composite powder, preparation of a composite material green body, sintering densification, deformation processing and heat treatment. According to the technology, low-cost preparation and processing of the low-density and high-strength aluminum-based composite material can be achieved, the technological process is simple, the production efficiency is high, the method is suitable for large-scale industrial production, and the application prospects in the fields of aerospace, new energy automobiles, ships, electronic communication and the like are huge.

The invention discloses a polyimide composite material and a preparation method thereof, and relates to the technical field of functional composites.The polyimide composite material is composed of hollow quartz fibers and silicon-containing polyimide resin, the fiber volume content of the polyimide composite material is 45%-60%, and the density of the polyimide composite material is 1.25-1.55 g / cm < 2 >; wherein the silicon-containing polyimide resin is formed by polymerizing a mixture of aromatic dianhydride, aromatic diamine and diamine containing a siloxane structure, and an end-capping reagent. The preparation method comprises the following steps: synthesizing a polyamide acid solution, preparing a prepreg by preimpregnation, performing by a vacuum bag method, performing hot-pressing curing and performing high-temperature post-treatment. Through collaborative innovation of the components and the process, the preparation method is simple, and the composite material has ultralow density, ultrahigh heat resistance, low dielectric constant and high strength and is suitable for the fields of aerospace, 5G communication, semiconductors and the like.

The invention discloses a preparation method of a high-density carbon-carbon composite material, which comprises the following steps: soaking a needled prefabricated body in a resin mixed solution, vacuumizing and dipping, drying in a drying oven, then putting into a mold, carrying out hot-pressing curing molding, and carbonizing to obtain the high-density carbon-carbon composite material. According to the preparation method, the carbon-carbon composite material with the density larger than 1.2 g / cm < 3 > can be obtained through one-time dipping and one-time hot pressing, the production period is short, energy consumption is low, the production cost is remarkably reduced, and the carbon-ceramic composite material with the density larger than 1.2 g / cm < 3 > can be obtained through one-time dipping and one-time hot pressing. And the prepared carbon-carbon composite material can achieve a high-density effect when the density is low, and has the characteristics of good air tightness, difficulty in deformation at high temperature and the like.

The invention provides an aluminum oxide aerogel composite material as well as a preparation method and application thereof, and belongs to the technical field of aluminum oxide aerogel preparation. The preparation method provided by the invention comprises the following steps: (1) preparing aluminum sol by taking coal gangue as an aluminum source; (2) mixing the aluminum sol obtained in the step (1) with aluminum silicate fibers, and performing gelation to obtain composite hydrogel; and (3) mixing the composite hydrogel obtained in the step (2) with ethanol, aging, mixing with a modifier, modifying, and carrying out graded normal-pressure drying to obtain the aluminum oxide aerogel composite material, the modifier in the step (3) is one or more of absolute ethyl alcohol, tetraethoxysilane and normal hexane. The alumina aerogel composite material prepared by the preparation method provided by the invention has the characteristics of low density, low heat conductivity coefficient and high strength, and is suitable for the high-temperature processing field of special materials and the aerospace field.

The invention discloses a ceramic component gradient modified C / C-SiC-ZrC composite material and a preparation method thereof, and belongs to the technical field of carbon / carbon composite material matrix modification preparation, a carbon fiber preform and a heating element are placed in chemical liquid phase vaporization deposition equipment, a precursor solution is added until the carbon fiber preform is fully soaked, and a ceramic component gradient modified C / C-SiC-ZrC composite material is obtained; and carrying out chemical liquid phase vaporization deposition reaction to obtain the low-density C / C composite material with porosity in unidirectional gradient distribution. And putting the mixture into a graphite crucible with a carbon-rich area facing downwards and a carbon-less area facing upwards, completely putting the graphite crucible into the ceramic powder for modification, reacting and infiltrating, and cooling to room temperature to obtain the C / C-SiC-ZrC composite material with the gradient modified ceramic components. The end with high ceramic content endows the material with a high-temperature thermal protection function, the end with high pyrolytic carbon content can effectively conduct heat generated in a ceramic-rich area, and the end with low ceramic content can effectively conduct heat generated in a ceramic-rich area. Due to the gradient design from the ceramic-rich area to the carbon-rich area, the material has high-temperature oxidation resistance and ablation resistance and is light, and lightweight design of an aerospace thermal protection structure is facilitated.

The invention discloses a tri-state fluid as well as a preparation method and application thereof. The three-state fluid comprises a water phase, a macromolecular thickening agent, a surfactant and hydrophobic aerogel particles, the macromolecular thickening agent, the surfactant and the hydrophobic aerogel particles are uniformly dispersed in the water phase, and the hydrophobic aerogel particles form a continuous three-dimensional network in the water phase. The three-state fluid has the structural characteristic of solid-liquid-gas three-phase state continuous interpenetration. The three-state fluid disclosed by the invention has the characteristics of low density and ultra-light weight of aerogel, fluidity of a fluid material and the like, solves the problem of uniform dispersion of an ultra-light aerogel material in a high-density fluid, and controls aerogel particles to form a dynamic stable continuous solid-gas network in the fluid; the material shows excellent performance in the aspects of shock absorption, damping, high-performance thermal insulation material forming and the like, and a new thought is provided for preparing a novel fluid material.

The utility model discloses a midsole secondary foaming forming machine cooling device which comprises a base, the top of the base is fixedly connected with a fixing block, one side of the fixing block is provided with a round through groove, a placing assembly used for placing a mold is arranged in the round through groove, the top of the base is fixedly connected with a bearing seat, and the bearing seat is provided with a bearing block. A cylinder is rotationally connected into the bearing seat through a bearing, a cavity is formed in the cylinder, a spiral pipe is fixedly connected into the cavity, and a connecting frame is fixedly connected to the inner wall of the cylinder. According to the utility model, the surface of the mold can be uniformly cooled through rotating centrifugal force, the problems of local supercooling and insufficient cooling of the mold are reduced, the deviation of medium and low density is reduced, the rotating speed required by different foaming materials can be matched, the rotating speed adjusting time is shortened, and the convenience of the device is improved; and the placing frame can be pushed to the middle of the cylinder, so that the production efficiency of the device is improved.

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 the technical field of polymer functional material processing, and particularly discloses a polyethylene waterproof breathable film using PTFE micro powder as an opening agent and a preparation method of the polyethylene waterproof breathable film. The waterproof breathable film is prepared from the following components in parts by weight: 50-70 parts of linear low-density polyethylene, 10-40 parts of PTFE (Polytetrafluoroethylene) micro powder, 3-8 parts of a modified compatilizer and an auxiliary agent. The preparation method comprises the following steps: S1, activating PTFE micro-powder by a silane coupling agent and coating the PTFE micro-powder with polyethylene wax to obtain modified micro-powder; s2, uniformly mixing all the components; s3, carrying out melt extrusion at 180-210 DEG C through a double-screw extruder, and carrying out tape casting to form a cast sheet; s4, the casting piece is heated to 90-115 DEG C for two-way stretching, and micropores are formed through interface stripping between the PTFE particles and the base body; and S5, carrying out heat setting at 120-130 DEG C, cooling, and rolling to form the film. Through the synergistic effect of the self-made compatilizer and the pretreatment process, the interface anchoring force is enhanced, the problems of powder falling and water leakage of highly-filled PTFE are solved, and meanwhile, high moisture permeability, high hydrostatic pressure resistance and high mechanical property are taken into account.

The invention belongs to the technical field of alloys, and provides a lightweight refractory multi-principal-element alloy with excellent high-temperature creep property, and a preparation method and application thereof. The general formula of the light refractory multi-principal-element alloy with the excellent high-temperature creep property is TiaVbAlcCrdMoe, wherein 43% < = a < = 48%, 43% < = b < = 48%, 2% < = c < = 8%, 2% < = d < = 8% and 1% < = e < = 5%, a + b + c + d + e = 100%, and a, b, c, d and e are mole percentages. The alloy presents an isometric crystal structure in a complete recrystallization state in a thermal mechanical treatment state, the phase structure is a single-phase body-centered cubic BCC structure, the alloy has low density and shows excellent creep property at 650 DEG C / 100 MPa, the creep time exceeds 90 h, and the creep elongation is lower than 10%.

The invention relates to a preparation method of a low-density boride aerogel material, and aims to solve the problems of high density, large pore diameter and poor heat insulation performance of the existing boride ceramic material with a porous structure, the method comprises the following steps: 1) preparing tannic acid-formaldehyde sol, and pre-gelling at a constant temperature; 2) preparing M / B precursor sol, and carrying out pregelation at a constant temperature; 3) mixing the tannic acid-formaldehyde sol and the M / B precursor sol, and fully and uniformly stirring to obtain mixed sol; 4) sealing and storing the mixed sol at a constant temperature to obtain boride precursor wet gel; (5) carrying out absolute ethyl alcohol replacement on the boride precursor wet gel, and drying at normal pressure to obtain boride precursor aerogel; and 6) carrying out high-temperature sintering on the boride precursor aerogel in a tubular furnace to obtain the pure-phase boride aerogel. The low-density boride aerogel material with a complete structure can be obtained, the material phase purity is high, the density and aperture are adjustable, the light absorption performance is excellent, the maximum porosity is-95%, and the low-density boride aerogel material has wide application prospects in the field of thermal protection of aircrafts as a light thermal insulation material.

The invention relates to the technical field of magnesium alloys, in particular to a low-density, high-modulus and ultrahigh-strength magnesium-based composite material and a preparation method thereof.The preparation method comprises the steps that SiC reinforcement particles are pretreated; the raw materials are proportioned according to the mass percent of the components of the magnesium alloy; melting pure magnesium, sequentially adding alloy elements, uniformly stirring, cooling to a semi-solid temperature interval, adding the pretreated SiC reinforcement particles, and casting in a preheating mold to solidify, so as to obtain a magnesium-based composite material cast ingot; the cast ingot is sequentially subjected to solution treatment and extrusion forming; carrying out secondary solution treatment on the magnesium-based composite material bar subjected to extrusion forming; and performing rotary swaging deformation and intermediate annealing treatment on the magnesium-based composite material bar subjected to secondary solution treatment to obtain the ultrahigh-strength magnesium-based composite material. Therefore, the problems that in the prior art, magnesium alloy is insufficient in strength and modulus, a magnesium-based composite material easily generates casting defects and is difficult to deform at room temperature, and the performance of the material is weakened due to grain growth during high-temperature deformation are solved.

The invention discloses a light epoxy resin-based wave-absorbing material and a preparation method thereof, and the light epoxy resin-based wave-absorbing material comprises the following components in parts by weight: 100 parts of epoxy resin molding compound, 1-6 parts of conductive filler, 20-40 parts of water-soluble polymer and 1-3 parts of foaming agent. The composition is uniformly dispersed in a ball mill, and the closed-cell foaming material with adjustable density is obtained by chemical foaming. And a Fe3O4 / PEDOT wave-absorbing agent is loaded in the holes in situ, so that a multi-layer structure design of'weak current-magnetism-strong current 'is realized in the integrally uniform foaming material. The epoxy resin-based electromagnetic shielding material has the advantages of low density, high electromagnetic shielding, high wave absorbing efficiency, excellent mechanical properties and the like.

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.

Disclosed herein is a syntactic-foam part and method of making the same. The method includes loading micro-sized low-density spheres into a mold having macro-permitted regions and macro-restricted regions. The method also includes loading macro-sized low-density spheres in the mold so that they are surrounded by micro-sized low-density spheres and each one is spaced apart from any other one of the macro-sized low-density spheres. All of the macro-sized low-density spheres are entirety within the macro-permitted regions of the mold. The method further includes introducing a resin into and filling the mold to embed the micro-sized low-density spheres and macro-sized low-density spheres and solidifying the resin after it fills the mold.

The invention discloses an intelligent early warning cable and a preparation method of the intelligent early warning cable, and belongs to the technical field of cables. The flame-retardant polyolefin composite material is prepared from the following raw materials in parts by weight: 5 to 10 parts of ethylene-vinyl acetate copolymer, 10 to 20 parts of linear low-density polyethylene, 10 to 15 parts of ethylene-octylene copolymer, 3 to 8 parts of compatilizer, 15 to 20 parts of organic modified vanadium dioxide, 30 to 40 parts of ionic liquid modified aluminum hydroxide, 1 to 1.5 parts of cross-linking agent and 1 to 2 parts of lubricant. Organic modified vanadium dioxide is introduced into a sheath layer material to serve as an intelligent early warning material, the cable sheath layer is endowed with the temperature change characteristic, when the local temperature of the cable is abnormally increased due to overload and other reasons, the material can trigger color change, and therefore a striking visual mark is formed in a complex wire harness, and the early warning effect is improved. And the problems of lag, low efficiency and existence of blind areas of the traditional monitoring means are solved.

The invention belongs to the field of aerogel composite materials, and discloses a heat insulation and wave absorption integrated aerogel composite material which at least has a three-stage pore network structure, the secondary structure is a continuous carbon network and is loaded in pores of the primary structure; the tertiary structure is silicon oxide aerogel with nano pores, and is polymerized on the surface of the secondary structure and in the pores in situ. The aerogel composite material is low in heat conductivity coefficient, good in heat insulation performance, excellent in wave absorbing performance and high in mechanical strength. The invention further discloses a preparation method of the material, the carbon-silicon dioxide composite material prepared through sol-gel and supercritical fluid drying is low in aerogel density and small in pore diameter and has a good barrier effect on solid heat transfer and gas heat transfer, and the prepared composite material has low heat conductivity and good heat conductivity. The continuous carbon network endows the material with excellent wave-absorbing performance.

The invention provides a geometric nonlinear multi-material topological optimization method based on a hyperelastic material model, and the method comprises the steps: building a topological optimization framework which takes the minimum end point type flexibility of a structure as an optimization target and takes the ratio of the overall mass of the structure to a single material body as an optimization constraint condition; according to the method, a projection variable field of a to-be-optimized engineering structure is obtained based on finite element analysis, a Neo-Yeoh hyperelastic material model is designed and established, in the topological optimization process of a structural material, screening of units with different projection variable values is achieved based on a set of original grids, and the optimal structure material is obtained. According to the geometric nonlinear topological optimization method based on the Neo-Hookean hyperelastic material, the entity unit is endowed with the Neo-Hookean hyperelastic material, and the hole or the low-density unit is endowed with the second-order Yeoh hyperelastic material, so that the problem of numerical instability caused by distortion of the low-density unit in geometric nonlinear topological optimization is solved, the designed model can be solved by utilizing a traditional commercial solver, and the universality is high.

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 a polyethylene insulating material as well as a preparation method and application thereof, and belongs to the technical field of insulating materials. The polyethylene insulating material is prepared from the following raw materials in parts by weight: 100 parts of low-density polyethylene, 5 to 8 parts of a grafting monomer, 3 to 5 parts of a styrene-ethylene-butylene-styrene block copolymer, 4 to 6 parts of modified hexagonal boron nitride, 8 to 10 parts of activated laponite, 0.3 to 0.8 part of an initiator and 0.1 to 0.3 part of an antioxidant. The grafting monomer is a fluorine-containing methacrylate monomer; the modified hexagonal boron nitride is hexagonal boron nitride modified by a silane coupling agent. According to the polyethylene insulating material provided by the invention, the space charge density is reduced, the direct-current conductivity is reduced, the direct-current breakdown field strength is improved, the problems of space charge accumulation and conductivity high-temperature sudden rise of a traditional material in a high-voltage direct-current field are solved, and the polyethylene insulating material has very high application value.

The invention relates to the technical field of cables, and discloses a halogen-free flame-retardant control cable. The halogen-free flame-retardant control cable sequentially comprises a plurality of wire cores, an insulating layer, a shielding layer and an outer protection layer from inside to outside, wherein the outer protection layer is formed by extruding a flame-retardant polyethylene composite material outside the shielding layer; the flame-retardant polyethylene composite material is prepared from the following raw materials in parts by weight: 60 to 80 parts of linear low-density polyethylene, 8 to 12 parts of compatilizer, 8 to 15 parts of modified flame retardant, 0.3 to 0.5 part of dibenzoyl peroxide, 1 to 3 parts of lubricant and 0.5 to 1.5 parts of antioxidant; wherein under the condition that the addition amount of the introduced modified flame retardant is relatively small, the flame retardant property of the cable can still be remarkably improved.

The invention relates to a high-strength light waist protection cushion and a preparation method thereof, and relates to the technical field of waist protection cushions, the high-strength light waist protection cushion comprises an upper outer surface coating material, a lower outer surface coating material and an inner container connected between the upper outer surface coating material and the lower outer surface coating material, the upper outer surface coating material and the lower outer surface coating material are integrally formed, the upper outer surface coating material and the lower outer surface coating material form an accommodating space for filling the inner container; the high-density outer surface coating material is prepared from high-density raw materials in a tape casting or spraying forming mode, the process is simple and efficient, an exoskeleton structure formed by the outer surface coating material can guarantee the appearance integrity of a seat product, the hardness of the seat product is improved, and the service life of the seat product is prolonged. The inner container is formed by injecting the high-temperature low-density raw material into the outer surface coating material, the inner container can provide additional support for the upper outer surface coating layer, the structural stability of a seat product is improved, and a product structure which cannot be manufactured through a traditional technology can be manufactured through the mode.

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.