202 results about "Polyethylene matrix" patented technology

The invention relates to the technical field of degradable PE (polyethylene) packaging materials, and discloses a PE film, a preparation process and application in tissue packaging, and the PE film is prepared by the following steps: by taking 7-(diethylamino) coumarin-3-carboxylic acid, 2-naphthyl methanol and epoxy chloropropane as raw materials, carrying out esterification reaction and quaternization reaction to prepare an epoxidized biodegradable organic photosensitizer; based on an epoxy-hydroxyl ring-opening reaction mechanism, hydroxylated titanium dioxide nanoparticles and polyvinyl alcohol resin are respectively modified by using an epoxidized biodegradable organic photosensitizer, and compounding is performed based on a pi-pi accumulation effect between aromatic rings to prepare the ultraviolet light dependent photo-biodegradable component. According to the present invention, the ultraviolet light dependent light-biological degradation component, the compatible component and the composite auxiliary agent are added to the polyethylene matrix, and blow molding is performed to obtain the PE film, and the film product shows excellent light-biological dual degradation performance, has actual use value, and can be used in the tissue packaging field.

The invention relates to the field of packaging film materials, and particularly discloses a packaging film material with a temperature control function and a preparation process of the packaging film material. The packaging film material with the temperature control function comprises an upper layer and a lower layer, the lower layer comprises the following raw materials in parts by weight: 40-56 parts of a polyethylene matrix, 3-5 parts of phase change microcapsules and 4-8 parts of heat conduction fibers, core materials of the phase change microcapsules are tetradecane and paraffin, and capsule wall materials are calcium carbonate; the upper layer comprises the following raw materials in parts by weight: 45-58 parts of polyester; in addition, the preparation method has the advantage of improving the thermal insulation performance of the membrane material.

The invention discloses an antioxidant grafted modified high-voltage direct-current cable polyethylene material and a preparation method thereof, and belongs to the technical field of modification of high-voltage direct-current cable insulating materials. The material is prepared from the following raw materials: polyethylene, an antioxidant GS and an initiator DCP. The preparation method comprises the following steps: firstly, mixing the polyethylene, the antioxidant GS and the initiator DCP to obtain an antioxidant GS / initiator DCP / polyethylene material blend; and then carrying out grafting and cross-linking treatment on the blend to obtain the cross-linked polyethylene insulating material grafted and modified by the antioxidant. The antioxidant grafted polyethylene material prepared by the invention has excellent oxidation resistance, electrical properties and good color, and is beneficial to prolonging the service life of a high-voltage direct-current cable. The antioxidant is grafted to a polyethylene molecular chain, so that the emigration of the antioxidant can be reduced, the compatibility of the antioxidant and a polyethylene matrix is improved, the oxidation resistance of polyethylene is improved, and the accumulation of space charges of a polyethylene insulating material can be inhibited.

The invention relates to the technical field of cables, in particular to a polyethylene insulating material, a preparation method thereof and a high-voltage direct-current cable. The polyethylene insulation material provided by the invention is prepared from the following preparation raw materials: 70 to 100 parts of polyethylene matrix, 0.1 to 30 parts of grafting master batch, 1 to 2 parts of cross-linking agent and oxidation inhibitor, the grafting master batch is prepared from the following raw materials: polyethylene resin, a grafting monomer and an antioxidant, wherein the grafting monomer comprises one or more of compounds with a structure as shown in a formula (I). The polyethylene insulating material provided by the invention has relatively high breakdown strength and relatively low conductivity.

The invention relates to the technical field of cables, and discloses a flame-resistant polyethylene wire and cable and a production method thereof.The wire and cable comprises a metal conductor and a polyethylene cable material wrapping the outer side of the metal conductor, and the polyethylene cable material takes high-density polyethylene and low-density polyethylene as main raw materials; according to the preparation method, a polyethylene matrix is used as a main material, an organic-inorganic composite flame retardant and other additives are used as auxiliary materials, mixing and extrusion processes are performed, the prepared organic-inorganic composite flame retardant is palygorskite of which the surface is coated with a phosphorus-containing polymeric macromolecular substance, and the organic phosphorus-containing polymeric macromolecular substance can form a'transition 'connection structure between the palygorskite and the polyethylene matrix; the transition structure can greatly improve the compatibility between the palygorskite and a polyethylene matrix, so that a mutual uniform dispersion effect can be generated between the palygorskite and the polyethylene matrix, and further the reinforcing effect of the organic-inorganic composite flame retardant can be utilized to improve the mechanical strength and flame resistance of the polyethylene.

The invention relates to a preparation method of a low-smoke halogen-free flame-retardant cable sheath material, and belongs to the technical field of cable materials. The cable sheath material is obtained by self-making a flame retardant and blending the flame retardant with polyethylene, a phosphorus-silicon-boron cross-linked network exists in the flame retardant, a protective layer is formed during combustion, the smoke amount is reduced while flame retardance is achieved, and low-smoke halogen-free flame retardance is achieved through phosphorus-silicon-boron synergy; according to the flame retardant disclosed by the invention, a phosphorus-oxygen group is connected with a silicon-oxygen group through a benzene ring, polarity mutation is buffered, and the flame retardant integrally presents low polarity, so that the compatibility between the flame retardant and a polyethylene matrix is enhanced, the flame retardant is more uniformly distributed in the matrix, the interface bonding is more excellent, and the mechanical property of the material is remarkably improved; and a long-chain siloxane coating structure in the flame retardant can form a water repellent layer on the surface of the material to achieve a hydrophobic effect, so that the dielectric property of the material is not influenced in a humid environment, and the stability and safety of power transmission are ensured.

The invention relates to the technical field of cables, and discloses a multilayer flame-retardant heat-conducting crosslinked polyethylene cable structure and a preparation process thereof. The product sequentially comprises a conductor layer, a heat-conducting flame-retardant buffer layer, a flame-retardant reinforced linkage layer and an outer sheath layer from inside to outside, wherein the heat-conducting flame-retardant buffer layer comprises a cross-linked polyethylene matrix, boron nitride, aluminum hydroxide and a shape memory polymer, and the outer surface of the heat-conducting flame-retardant buffer layer is provided with interlocking bulges with embedded heat-conducting microtubes; the flame-retardant reinforced linkage layer contains a cross-linked polyethylene matrix, expanded graphite and graphene, and a groove with a flame-retardant elastic piece is formed in the inner surface of the flame-retardant reinforced linkage layer. The preparation method comprises the following steps: firstly preparing the silver-plated conductor, then respectively preparing the heat-conducting flame-retardant buffer layer and the flame-retardant reinforced linkage layer, then aligning the two layers, carrying out hot-pressing compounding, carrying out irradiation crosslinking on the composite structure, and finally extruding and coating the outer sheath and carrying out cooling shaping. The product can be used in scenes of new energy power stations, data centers and the like, and has the advantages of synergism of flame retardance and heat conduction and long-term stability of an interlayer structure.

The invention relates to the technical field of insulating materials, and discloses a crosslinked polyethylene insulating material which comprises the following components: 40-50 parts of linear low-density polyethylene, 10-20 parts of low-density polyethylene, 3-8 parts of polypropylene resin, 2-3 parts of a silane coupling agent, 0.8-1.5 parts of an initiator and 0.9-1.5 parts of a polycyclic conjugated antioxidant, and further comprises a preparation method of the crosslinked polyethylene insulating material. Comprising the following steps: S1, compounding and pretreating a matrix material, namely mixing low-density polyethylene and linear low-density polyethylene, adding polypropylene resin, an antioxidant and a lubricant, premixing, and drying to form a polyethylene matrix; according to the invention, through a multi-component collaborative design concept, the cross-linked polyethylene insulating material has remarkable advantages in the aspect of electrical performance, and the long-acting stability of the insulating layer material is enhanced, so that the service life of the insulating layer material is prolonged.

The invention relates to the technical field of foamed composite materials, in particular to a high-elasticity polyethylene foamed composite material and a preparation method thereof, and the high-elasticity polyethylene foamed composite material comprises the following raw materials: low-density polyethylene, modified nano silicon nitride, modified graphene, azodicarbonamide, a coupling agent, an antioxidant, an antistatic agent and a plasticizer. The low-density polyethylene, the modified nano silicon nitride and the modified graphene play a role through a synergistic effect, the low-density polyethylene provides a stable carrier supporting effect for the modified nano silicon nitride and the modified graphene, and the modified nano silicon nitride increases the cohesive force of a low-density polyethylene matrix, so that the heat resistance of the modified nano silicon nitride is improved; the modified graphene optimizes the molecular chain structure of polyethylene, and the stress dispersion capability of the foamed composite material is enhanced through the two-dimensional structure and the ultrahigh specific surface area of the modified graphene, so that the rebound resilience of the material is synergistically improved; and the polyethylene foaming composite material can still keep good rebound resilience under long-time high-load work.

The invention relates to a wear-resistant waterproof cable sheath material and a preparation method thereof, and belongs to the technical field of cable materials. The cable sheath material is prepared by self-making a modifier and blending the modifier with a fumed silica modified filler modified by a perfluoroalkyl silane coupling agent, FEP and polyethylene. Perfluoroalkyl of the modified filler and FEP cooperate to improve the water resistance and corrosion resistance of the material; the modifier can enhance the polarity of a polyethylene matrix, forms polarity gradient matching with other components of the system, enhances the interfacial compatibility, and improves the mechanical properties of the material; a benzotriazole structure in the modifier can prevent the material from being damaged by ultraviolet irradiation; besides, during combustion, phosphorus in the material forms a carbon layer on the surface, nitrogen in benzotriazole serves as a foaming agent to expand the carbon layer, efficient flame retardance is achieved synergistically, the material has excellent ultraviolet resistance and flame retardance, and the service life of the material is prolonged.

The invention provides a wear-resistant polyethylene composite material for a marine organism prevention device and a preparation method of the wear-resistant polyethylene composite material, a UiO-66 (Zr) metal organic framework is adopted as a basis, and linear polyethyleneimine is used for coating modification to obtain a UiO-66 (Zr) coated PEI wear-resistant filler; and then the UiO-66 (Zr)-coated PEI wear-resistant filler, a polyethylene matrix, a compatibilization modifier and an antioxidant are subjected to mixed injection molding to obtain the polyethylene composite material with good mechanical properties and excellent wear resistance, and the polyethylene composite material is suitable for being widely applied to offshore wind power marine organism prevention devices.

The invention provides a high-dispersity polyethylene primary color master batch and a preparation method thereof, and relates to the field of polyethylene primary color master batches. The high-dispersity polyethylene-based primary color master batch comprises 40-60% of high-density polyethylene, 20-40% of a heat-stable pigment, 10-20% of a dispersant and 5-10% of a compatible agent. By selecting the specific heat-stable pigment and combining the efficient dispersing agent, the stability of the pigment in the high-temperature processing process and the uniform dispersity of the pigment in a polyethylene matrix are effectively improved, so that the color consistency and quality of the color master batch at high temperature are ensured; according to the technical scheme, the mechanical property of the color master batch is enhanced, so that the color master batch is more suitable for high-speed injection molding processing, and the preparation method in the scheme comprises accurate ratio control and efficient mixing and extrusion processes, and particularly adopts an ultrasonic mixing technology and a double-screw extruder.

The invention provides an anti-icing film with photo-thermal and ice nucleation capabilities and a preparation method of the anti-icing film. The anti-icing thin film is a multi-phase multi-component hybrid thin film and is prepared from polyethylene, a polyacrylic acid-polyethyleneimine compound, ferroferric oxide nano particles and graphene oxide nano sheets. Wherein the polyacrylic acid-polyethyleneimine compound is dispersed in a continuous phase of a polyethylene matrix in an island-shaped structure, the ferroferric oxide nanoparticles are dispersed in the continuous phase of the polyethylene matrix and on a'sea-island 'interface, an excellent photo-thermal function is given, and the graphene oxide nanosheets are adsorbed on the outer surface of a phase region of the polyacrylic acid-polyethyleneimine compound. As an ice nucleation site, water vapor in the environment is induced to freeze, meanwhile, the vapor pressure of water vapor in the surrounding area is reduced, and freezing of the water vapor on the surface of the polyethylene phase area is inhibited. The anti-icing film provided by the invention can induce environmental water vapor to form a discontinuous ice layer on the surface of the film, reduce the ice adhesive force between the ice layer and the film, and enable the ice layer to be easily removed under the photo-thermal action, thereby achieving the purpose of preventing and removing ice.

The invention provides a preparation method of a high-performance high-density polyethylene composite material, and relates to the field of polyethylene composite materials. The high-performance high-density polyethylene composite material comprises the following components in percentage by weight: 60-80wt% of high-density polyethylene, 15-30wt% of a reinforcing material which is a glass fiber, a carbon fiber, a nano material or a combination thereof, and 1-5wt% of a dispersing agent which is used for improving the uniform distribution of the reinforcing material in a polyethylene matrix, the stabilizer is used for preventing thermal degradation of the material in the production process. Through precise formula design and an advanced mixing technology, the uniform distribution of the reinforced material in a polyethylene matrix is remarkably improved, and the high performance and consistency of a final product are ensured. The ultrasonic dispersion technology and the high-speed shear mixing technology are combined, so that the problem that the reinforcing material is difficult to uniformly disperse in the traditional method is solved, and the non-uniformity of the material performance is effectively avoided.

The invention discloses a high-strength waterproof polyethylene composite material and a preparation method thereof, and belongs to the technical field of high-molecular compound compositions, and the high-strength waterproof polyethylene composite material comprises the following raw materials by mass: 100-120 parts of high-density polyethylene, 20-30 parts of polypropylene resin, 1-3 parts of an antioxidant, 1-3 parts of a lubricant, and 1-3 parts of a lubricant. The material comprises, by weight, 1-1.2 parts of dicumyl peroxide, 8-10 parts of modified composite glass fibers, 2-3 parts of a stabilizer, 5-6 parts of a coupling agent and 0.3-0.4 part of an antioxidant. According to the high-strength waterproof polyethylene composite material prepared by the preparation method disclosed by the invention, the glass fibers are modified and then uniformly dispersed in a high-density polyethylene matrix, and the flame retardant is compounded with the glass fibers, so that the dispersity of the flame retardant in the high-density polyethylene matrix is improved, and the influence of flame retardant filler on the mechanical property of the polyethylene composite material is reduced; the strength and the flame retardant property of the high-strength waterproof polyethylene composite material are improved.

The invention relates to the field of polyethylene composite materials, and discloses an impact-resistant high-density polyethylene composite material and a preparation method thereof.The impact-resistant high-density polyethylene composite material is prepared from, by weight, 60-70 parts of matrix resin, 5-11 parts of flexibilizer, 4-9 parts of inorganic filler, 1-3 parts of compatilizer, 0.5-1.5 parts of antioxidant and 2-4 parts of ultraviolet stabilizer, the matrix resin is high-density polyethylene with the molecular weight of 90,000-120,000, and the flexibilizer is a compatilizer. The flexibilizer is chlorinated polyethylene, the chlorine content is 25 + / -1 wt%, the inorganic filler is modified talcum powder, the D50 particle size is smaller than or equal to 3 microns, and the length-diameter ratio is larger than or equal to 10. The surface of the talcum powder is modified by gamma-aminopropyltriethoxysilane, and the length-diameter ratio of the particle size is controlled, so that the chemical bonding effect of the filler and a high-density polyethylene matrix is enhanced, the high-efficiency transmission and uniform dispersion of stress are facilitated, and the local stress concentration phenomenon under the impact load is effectively inhibited.

The invention relates to the technical field of cable production, and discloses a new energy charging heat-conducting flame-retardant cable which sequentially comprises a conductor layer, a heat-conducting insulating layer, a self-healing layer, a shielding layer, a mechanical enhancement layer and a flame-retardant outer sheath layer from inside to outside. The conductor layer is formed by a plurality of stranded tin-plated copper wires or nickel-plated copper wires; the heat-conducting insulating layer is composed of a crosslinked polyethylene matrix, a two-dimensional heat-conducting filler and phase-change temperature-adjusting microcapsules, the two-dimensional heat-conducting filler comprises a mixture of boron nitride nanosheets oriented by an electric field and graphene, and the mass fraction of the filler is 40%-55%; a core material of the phase-change temperature-adjusting microcapsule is a compound of paraffin and stearic acid. According to the scheme, trace rare earth and silver elements are introduced into the conductor to form a Cu-Ag-RE solid solution structure, so that the crystal integrity and the oxidation resistance of the conductor are remarkably improved; the structure still keeps excellent conductivity and bending resistance at high temperature, so that the cable can stably operate for a long time in a high-temperature and strong ultraviolet environment during charging, and the conductivity efficiency is improved.

A polyethylene composition has a polyethylene matrix resin and a pore-forming agent. The content of the pore-forming agent is 30-110 parts by weight on the basis of 100 parts by weight of the polyethylene matrix resin. The pore-foaming agent contains maleic anhydride copolymer microspheres, a copolymer in the microsphere comprises a structural unit A from maleic anhydride, a structural unit B from a vinyl-containing comonomer M and an optional cross-linking structure unit from a cross-linking agent, and the average particle size of the maleic anhydride copolymer microspheres is 500-2000 nm. The polyethylene composition can be used for preparing a breathable film without using a coupling agent, a dispersing agent and / or a surfactant, and achieves uniform air permeability and a high water vapor transmission rate. The film can be used for breathable composite products such as sanitary products, medical products, and food packaging or building products.

The invention belongs to the technical field of marine antifouling, and relates to a PE pipe coated with a capsaicin modified antifouling coating. The invention provides a PE pipe coated with a capsaicin modified antifouling coating, the PE pipe comprises a polyethylene matrix and an antifouling coating coated on the surface of the polyethylene matrix, the antifouling coating comprises waterproof paper printed with a capsaicin dot matrix and tung oil acid substances coated on the surface of the waterproof paper. The irritant capsaicin dot matrix is printed on the waterproof paper, the surface of the PE pipe is coated with the waterproof paper, then the surface of the waterproof paper is coated with the tung oil acid substances, the hydrophobicity of the surface of a coating and the cohesiveness of the coating and a PE base body are improved, and the effect of preventing marine organisms from adhering is achieved.

The invention relates to the technical field of plastics, and discloses a polyolefin-based plastic particle and a production process thereof, the plastic particle is prepared by taking high density polyethylene as a base material and cooperating with linear low density polyethylene, a compatilizer, a functional agent and other auxiliary materials through mixing and extrusion granulation processes, wherein the functional agent is prepared by modifying a polymeric macromolecular nitrogen-phosphorus flame retardant on the surface of hydroxyapatite, and in the subsequent high-temperature melt extrusion process, the molecular chain of the polymeric macromolecular nitrogen-phosphorus flame retardant can extend to each region of a polyethylene matrix, so that the hydroxyapatite exists in the matrix in the form of a physical crosslinking point, and the flame retardance of the polyethylene matrix is improved. On one hand, the advantage of self inorganic enhancement can be efficiently played, the mechanical property of the material is improved, and on the other hand, the uniformly dispersed hydroxyapatite can also cooperate with the polymeric macromolecular nitrogen-phosphorus flame retardant, so that the flame retardant property of the material is effectively improved.

The invention relates to the technical field of high polymer materials, in particular to high-barrier modified polyethylene which comprises high-density polyethylene, vinyl silane, montmorillonite, alkali, an antioxidant, nano silicon dioxide, a polyolefin grafted compound, a plasticizer and a stabilizer. According to the invention, additives such as vinyl silane, modified montmorillonite and the like are introduced into high-density polyethylene, and an irradiation crosslinking process is adopted, so that the gas barrier property and the mechanical property of polyethylene are remarkably improved; through surface modification of the montmorillonite, the compatibility of the montmorillonite and a polyethylene matrix is improved, so that the polyethylene matrix is more uniform in microstructure, and the barrier effect is effectively enhanced; by adopting an irradiation crosslinking technology, not only is the barrier property of polyethylene improved, but also the heat resistance and the mechanical strength of the polyethylene are enhanced, so that the material can keep stable performance in a harsh environment; compared with a traditional modification method, the method has the advantages that the production process is simplified, and the dependence on chemical additives is reduced.

The invention provides a thermosensitive color-changing crosslinked polyethylene pipe and a preparation method thereof. The thermochromic crosslinked polyethylene pipe comprises the following components in parts by weight: 100 parts of polyethylene, 30-50 parts of epoxidized soybean oil, 0.5-2 parts of nano titanium dioxide, 3-8 parts of a compatilizer, 1.5-5 parts of a thermochromic pigment, 0.5-1.2 parts of an antioxidant and 0-3 parts of a functional additive, the cross-linking degree of the thermosensitive color-changing cross-linked polyethylene pipe is reduced from inside to outside in a gradient mode. By adding epoxidized soybean oil as a dispersing agent into a polyethylene matrix and performing interface modification through nano titanium dioxide, under the combined action, the interfacial tension between the pigment and the polyethylene matrix is reduced, the dispersing performance of the pigment in the polyethylene matrix is improved, and the heat sensitivity and mechanical strength of the crosslinked polyethylene pipe are remarkably improved; and gradient cross-linking distribution is further combined, so that the bursting pressure of the cross-linked polyethylene pipe is further improved.

The invention discloses a fast-extrusion, anti-sagging and large-diameter pipeline material and a preparation method thereof. The anti-sagging large-diameter pipeline material comprises the following components: high-density polyethylene, functionalized polyethylene, a cycloolefin polymer and carbon black master batch. Wherein the functionalized polyethylene is maleic anhydride grafted polyethylene resin grafted modified graphene. Due to the special structure of the functional master batch, on one hand, the functional master batch has very good compatibility with a high-density polyethylene matrix, uniform dispersion can be realized, so that a very good enhancement characteristic is provided, and meanwhile, functional polyethylene has an extremely high heat conductivity coefficient, and has a better sag resistance characteristic when a large-caliber thick-wall pipe (the pipe diameter is more than 1000mm and the wall thickness is more than 100mm) is produced. According to the large-diameter pipeline material disclosed by the invention, a thinner large-diameter pipe with more uniform wall thickness can be produced through the comprehensive influence of high heat dissipation efficiency of the polyethylene master batch in the formula, rapid cooling and shaping after extrusion of cycloolefin and the like.

The invention relates to the technical field of fiber reinforced composite materials, and provides a glass fiber prepreg tape and a preparation method and application thereof in a polyethylene pipeline, the glass fiber prepreg tape comprises the following raw materials by weight: 90-110 parts of a polyethylene matrix, 160-200 parts of modified glass fiber, 1-5 parts of a compatilizer, 0.5-5 parts of an antioxidant, and 0.2-1 part of a flame retardant. The glass fiber prepreg tape provided by the invention has good tensile strength and impact strength, and can be widely applied to polyethylene pipelines.

The invention relates to the field of power cable materials, in particular to an ultrahigh-voltage cable insulating material, a preparation method thereof and a cable. The ultrahigh-voltage cable insulating material is prepared from the following raw materials in parts by mass: 80 to 100 parts of polyethylene, 1 to 5 parts of a cross-linking agent, 0.5 to 1 part of a compatilizer and 0.1 to 1 part of an organic molecular semiconductor. According to the ultrahigh-voltage cable insulating material, the organic molecule semiconductor with high electron affinity is introduced into the polyethylene matrix, and free electrons are attracted and fixed through strong static electricity of the organic molecule semiconductor, so that injection, migration and accumulation processes of charges in the cable insulating material are blocked; the problem of space charge accumulation of a cable insulating material in a high-voltage environment is solved from the source, and the insulativity and the long-term operation reliability of the cable insulating material are effectively improved.

The invention relates to the technical field of composite materials, and discloses a polyethylene composite material for manufacturing a food packaging box and a preparation method thereof.The polyethylene composite material is prepared from polyethylene, an antioxidant, a lubricant, a compatilizer, a composite reinforcing material and a functional additive. According to the present invention, by adding the functional additive into the polyethylene matrix, the effective stress dispersion point can be formed in the polyethylene matrix, the toughness of the composite material can be improved, and the mechanical property of the composite material can be effectively improved; the antibacterial substance is introduced in a chemical bonding manner, and the antibacterial property of the composite material is improved, so that the polyethylene composite material prepared by the invention is excellent in mechanical property, toughness and antibacterial property, and can be used for manufacturing food packaging boxes.

The invention provides a flame-retardant polyethylene sheathed cable and production equipment thereof, and relates to the technical field of cable production, the cable comprises a conductor cable core, a flame-retardant polyethylene sheath containing a flame retardant is wrapped outside the conductor cable core, the flame retardant contains 60 parts of magnesium hydroxide on the basis of 100 parts of polyethylene matrix, a phase change heat conduction cavity is formed in the sheath and contains 20wt% of borax aqueous solution, and the phase change heat conduction cavity is communicated with the flame-retardant polyethylene sheath. The production equipment comprises an extrusion die head, an extrusion die core in the extrusion die head is formed by splicing six groups of split die cores, injection cavity channels are arranged among the die cores, one end of the extrusion die core is inserted into a heat conduction cavity forming die, and the other end of the extrusion die core is inserted into a heat conduction cavity forming die. According to the cable, the high temperature resistance and flame retardance are improved through the phase change heat management system, efficient production is achieved through equipment, and it is guaranteed that solution filling and structure forming are synchronous.

This invention relates to a method for preparing a low-smoke, halogen-free flame-retardant cable sheath material, belonging to the field of cable material technology. The invention involves preparing a flame retardant and blending it with polyethylene to obtain the cable sheath material. The phosphorus-silicon-boron cross-linked network present in the flame retardant forms a protective layer during combustion, reducing smoke emission while providing flame retardancy. Low-smoke, halogen-free flame retardancy is achieved through the synergistic effect of phosphorus-silicon-boron. The flame retardant connects phosphorus-oxygen groups and silicon-oxygen groups via benzene rings, buffering polarity abrupt changes. Furthermore, the flame retardant exhibits low polarity overall, enhancing its compatibility with the polyethylene matrix, resulting in a more uniform distribution of the flame retardant within the matrix, superior interfacial bonding, and significantly improved mechanical properties. The long-chain siloxane coating structure in the flame retardant forms a water-repellent layer on the material surface, providing a hydrophobic effect and ensuring that the dielectric properties of the material are not affected in humid environments, thus guaranteeing the stability and safety of power transmission.

The invention relates to the technical field of preparation of composite PE (polyethylene) films, and discloses a printing composite PE film for a sanitary bag, which comprises 94.0-99.0 parts by mass of polyethylene matrix resin; 0.5 to 5.0 parts by mass of hyperbranched polyolefin; 0.1 to 0.5 part by mass of polyethylene wax; 0.1 to 0.3 part by mass of a composite antioxidant; the preparation method comprises the following steps: synthesizing the functionalized hyperbranched polyolefin, and mixing the polyethylene resin and the additive; extruding, blending and granulating by using double screws; carrying out multi-layer co-extrusion film blowing molding; controlling air temperature to cool the film bubbles; and adjusting the tension and rolling to form the film. The hyperbranched polyolefin with a specific terminal functional group is introduced into the polyethylene matrix resin, and the hyperbranched polyolefin is promoted to migrate to the surface of the film in the melting processing process, so that a stable interface layer with relatively high surface energy is formed, and the adhesion fastness and the composite peel strength of the ink are improved.

The present invention relates to the technical field of polyethylene films, and discloses a preparation method of a high-strength polyethylene blown film. Metallocene polyethylene, maleic anhydride and octavinyl-POSS are used to initiate polymerization to obtain polyethylene grafted polyene POSS, which is subjected to epoxidation treatment to obtain polyethylene grafted epoxy POSS. Its structure consists of an inorganic cage-like nucleus formed by silicon oxygen, which has a rigid structure and steric hindrance effect, hinders the movement of polyethylene chain segments, can form nano-inorganic microphase regions, avoids a large amount of agglomeration of inorganic particles, and enables them to be evenly dispersed in the polyethylene matrix; PBAT itself has high toughness, belongs to polar molecules, has good moisture permeability, presents a two-phase separation state in the co-blown film, improves the water resistance of the polyethylene matrix, can selectively slow down the gas exchange between O2 and the outside world, avoids the condensation phenomenon in fruit and vegetable packaging, and has good biodegradability.