964 results about "Metallocene" patented technology

The invention discloses a metallocene polyethylene material, a composite mulching film and a preparation method thereof, and the metallocene polyethylene material comprises the following raw materials by mass: 75-85 parts of metallocene polyethylene resin, 15-25 parts of high density polyethylene, 0.05-0.2 part of a main antioxidant, 0.1-0.25 part of an auxiliary antioxidant, 1-2 parts of silane coupling agent modified nano zinc oxide, and 1-2 parts of silane coupling agent modified mica powder. And 0.05 to 0.2 part of a slipping agent. The prepared metallocene polyethylene composition has the advantages of excellent processability, tensile strength, mechanical strength, aging resistance and the like.

The invention provides a tear-resistant, wear-resistant, low-smoke and non-dripping sheath material as well as a preparation method and application thereof. The tear-resistant wear-resistant low-smoke non-dripping sheath material is prepared from the following components in parts by weight: 25 to 35 parts of metallocene linear low-density polyethylene, 10 to 15 parts of ethylene-vinyl acetate copolymer, 6 to 8 parts of compatilizer, 50 to 60 parts of aluminum hydroxide, 10 to 15 parts of magnesium hydroxide, 3 to 4 parts of microencapsulated red phosphorus, 5 to 8 parts of lithium oxide synergist, 4 to 6 parts of silicone master batch, 0.3 to 0.7 part of carbon black master batch and 1.5 to 2.5 parts of coupling agent. The tear-resistant wear-resistant low-smoke non-dripping sheath material provided by the invention has the characteristics of being halogen-free, flame-retardant, tear-resistant and wear-resistant, and a low-smoke halogen-free flame-retardant power cable prepared from the sheath material has the characteristics of high smoke light transmittance during combustion, no dripping and cracking resistance.

The invention relates to the technical field of research and development of BIB liquid packaging materials, and discloses a PE-PA-based composite film, a manufacturing process and an application in BIB liquid packaging, and specifically comprises the following steps: synthesizing a PE-PA compatilizer; the preparation method comprises the following steps: carrying out ring-opening reaction on an epoxy functional group of a PE-PA compatilizer and an amino functional group or a carboxyl functional group at a PA resin molecular chain end to prepare PE-PA compatilizer grafted nylon resin, and carrying out physical anchoring action on a long-chain alkane structure on the PE-PA compatilizer grafted nylon resin and a PE resin molecular chain to prepare the PE-PA alloy master batch; low-density polyethylene resin is used as a raw material of a supporting layer, PE-PA alloy master batch is used as a raw material of a functional layer, metallocene polyethylene resin is used as a raw material of a heat sealing layer, a three-layer co-extrusion blow molding film forming technology is adopted, the PE-PA composite film is prepared, and the film product is excellent in comprehensive performance and can be used for manufacturing a BIB bag body.

The invention provides a high-temperature-resistant corrosion-resistant cable material for a control line and a preparation method of the high-temperature-resistant corrosion-resistant cable material, and belongs to the field of metallocene polyolefin materials. The cable material is prepared from the following chemical raw materials: 45 to 65 parts of maleic anhydride grafted metallocene polyolefin, 5 to 10 parts of maleic anhydride grafted polyolefin elastomer, 3 to 6 parts of epoxy group modified polyhedral oligomeric silsesquioxane, 2 to 5 parts of polyether amine, 5 to 10 parts of ion response type core-shell structure sustained release microspheres, 8 to 15 parts of multi-dimensional reinforcement, 15 to 25 parts of halogen-free flame retardant, 0.5 to 1.5 parts of antioxidant and 0.5 to 1.5 parts of processing aid. The chemical raw materials with specific functions are accurately selected, a synergistic effect system is constructed, and meanwhile, the high temperature resistance and corrosion resistance of the cable material for the control line are improved.

Disclosed in the present invention are a 90°C thermoplastic halogen-free low-smoke flame-retardant polyolefin sheath material and a preparation method therefor. The sheath material is prepared from raw materials comprising the following components in parts by mass: 20-40 parts of an ethylene-vinyl acetate copolymer, 20-40 parts of a linear low-density polyethylene, 2-10 parts of a high-density polyethylene, 20-40 parts of a metallocene ethylene-octylene copolymer, 10-15 parts of a maleic-anhydride-grafted metallocene linear low-density polyethylene copolymer, 58-73 parts of aluminum hydroxide, 20-25 parts of modified magnesium hydroxide, 64-84 parts of a synergistic flame retardant, 2-3 parts of a coupling agent, 1-4 parts of a lubricant, 1-3 parts of an antioxidant, and 2-7 parts of a coloring agent, wherein the synergistic flame retardant comprises lithium oxide. A matrix resin has low-temperature performance, mechanical properties and cracking resistance. With regard to flame retardance, a large amount of the synergistic flame retardant, i.e., lithium oxide, is added to a traditional magnesium-aluminum compound flame-retardant system, and therefore an off-white hard shell can be formed during a combustion process while low heat release is ensured, thereby ensuring no dripping during the combustion process.

The present invention relates to the technical field of supported metallocene catalysts, and particularly relates to a supported metallocene catalyst additive, a preparation method thereof and an application. The supported metallocene catalyst additive has the following structure: #imgabs0#, wherein R is selected from C1-C10 alkyl groups, R1 and R3 are selected from alkyl groups and adamantyl groups and are in the ortho and para positions of -OH, R2 is selected from C1-C10 alkyl groups and cycloalkyl groups, and R' is selected from alkyl groups. This additive can greatly retain the catalytic activity and copolymerization performance of the metallocene catalyst, increase the metal loading and catalytic activity, and reduce the dosage of the traditional cocatalyst MAO.

The invention belongs to the technical field of waterproof and drainage boards, and provides a waterproof and drainage board with high compressive strength and tensile strength and a preparation method and application thereof.The waterproof and drainage board is formed by compounding an upper layer, a middle layer and a lower layer, and the upper layer and the lower layer are each prepared from 30-40 parts of high-density polyethylene, 10-20 parts of chlorinated polypropylene, 10-15 parts of metallocene polyethylene and 1-3 parts of carbon nanotubes; 2-5 parts of nano calcium carbonate, 1-5 parts of polyethylene wax, 1-3 parts of an antioxidant and 1-3 parts of an anti-ultraviolet agent; the middle layer is prepared from the following raw materials: 35 to 55 parts of linear low-density polyethylene, 15 to 30 parts of metallocene polyethylene, 10 to 15 parts of ethylene-vinyl acetate copolymer, 5 to 10 parts of POE (Polyolefin Elastomer), 5 to 10 parts of aramid chopped fiber, 1 to 3 parts of antioxidant and 1 to 3 parts of ultraviolet screening agent; the nano calcium carbonate is subjected to modification treatment. The waterproof and drainage board has relatively high compressive strength and tensile strength, and has a good application prospect.

The invention discloses a method and a device for preparing a single-walled carbon nanotube based on the host-guest interaction of pillararene and metallocene. The method comprises the following steps: enabling a host compound and a guest compound to form a host-guest complex; the host compound comprises pillararene or a derivative thereof, and the guest compound comprises a cyclopentadienyl metal complex or a derivative thereof; the method comprises the following steps: reacting a mixed reaction system containing a host-guest compound and a polymerization inhibitor at a high temperature to obtain nano-scale catalyst particles; and contacting the nano-catalyst particles with a carbon source, and decomposing and growing the carbon source on the surfaces of the nano-catalyst particles to prepare the single-walled carbon nanotubes. The method disclosed by the invention is mainly based on the strong inclusion behavior of the host compound and the guest compound, and by utilizing the compatibility of the host compound, the solubility of the metallocene in an organic solvent is effectively improved, the decomposition time of the metallocene at high temperature is prolonged, and the in-situ controllable preparation of nano-scale catalyst particles is achieved; and furthermore, the yield and the quality of the single-walled carbon nanotubes are improved.

The invention relates to the technical field of composite films, and provides a PE film, a preparation method thereof and application of the PE film in metal powder packaging. The PE film comprises an outer layer, a middle layer and an inner layer which are sequentially arranged, preparation raw materials of the outer layer comprise low-density polyethylene, linear low-density polyethylene, metallocene medium-density polyethylene and a processing aid, and preparation raw materials of the middle layer comprise low-density polyethylene, linear low-density polyethylene, high-density polyethylene and a processing aid. And the inner layer is prepared from the following raw materials: low-density polyethylene, an antistatic agent and a processing aid. When the PE film is used for packaging metal powder, the effect that the metal powder does not adhere to a bag can be achieved, the phenomenon that a seal is not firm due to the fact that metal adheres to the seal is avoided, meanwhile, waste of the metal powder is avoided, and the PE film has wide application prospects.

The invention relates to the technical field of pearl wool composite materials, in particular to a pearl wool composite material based on an ethylene polymer and application of the pearl wool composite material in building heat preservation, the pearl wool composite material comprises the ethylene polymer, pearl wool particles and nano aerogel, the ethylene polymer is a mixture of linear low density polyethylene and metallocene polyethylene in a specific proportion, the pearl wool particles are treated by the silane coupling agent, the particle size is 0.5-2 mm, the porosity of the nano aerogel exceeds 90%, the average pore size is 2-20 nm, the components are proportioned according to specific parts by weight, the performance of the composite material is improved through the synergistic effect, and the composite material can be used in the field of building heat preservation. The composite material disclosed by the invention has the advantages of excellent thermal insulation performance, capability of effectively reducing building energy consumption, good mechanical property, high deformation resistance, long service life, good flame retardant property, capability of guaranteeing building safety, simple preparation process, low cost, wide application, capability of being used for multiple parts of a building, convenience in construction and high comprehensive benefit.

Embodiments provide bimodal polymerization catalyst systems comprising metallocene olefin polymerization catalysts and biphenylphenol polymerization catalysts made from biphenylphenol polymerization precatalysts of Formula I.

The invention provides a high-toughness plastic packaging film material and a preparation method thereof, and belongs to the field of metallocene polyolefin plastics. The high-toughness plastic packaging film material is prepared from the following chemical raw materials: 80 to 90 parts of metallocene polyethylene resin, 5 to 8 parts of supramolecular cross-linking agent, 6 to 10 parts of core-shell type modifier, 3 to 5 parts of ethylene-vinyl acetate copolymer, 2 to 4 parts of stearic acid modified nano calcium carbonate, 2 to 3 parts of polyolefin elastomer, 0.2 to 0.5 part of di (3, 4-dimethyldibenzylidene) sorbitol, 2 to 5 parts of thermotropic liquid crystal polymer and 0.4 to 0.7 part of antioxidant. 0.8 to 1.2 parts of a lubricant and 0.5 to 1.0 part of an antistatic agent. Through the compatibility design of a toughening mechanism, the synergistic balance of an enhancing mechanism and the optimization of transparency guarantee, the functions of all the components in a metallocene polyethylene resin matrix are complemented, and the ultrahigh toughness, high strength and high transparency of the film material are achieved.

The application discloses a high-temperature-resistant and high-barrier composite film and a preparation method thereof, and relates to the technical field of layered products, which comprises A, B and C layers in sequence; the A layer comprises a temperature-resistant layer, a substrate layer and a barrier layer in sequence; the B layer comprises a substrate layer, a connecting layer, a barrier layer, an aluminum plating layer and a protective layer in sequence; the C layer is a heat-sealing layer; the preparation raw materials of the temperature-resistant layer material comprise aluminum oxide and titanium nitride; the preparation raw materials of the barrier layer material comprise ethylene-vinyl alcohol copolymer, succinamic acid, furoinic acid and carbon nanotubes; and the preparation raw materials of the heat-sealing layer material comprise titanium carbide, high-density polyethylene, metallocene polyethylene and zinc stearate. The high-temperature-resistant and high-barrier composite film provided by the application has excellent high-temperature resistance and barrier properties.

The invention discloses a cross-linking type biodegradable POF heat shrink film and a preparation method thereof, and belongs to the technical field of heat shrink films, and the cross-linking type biodegradable POF heat shrink film is characterized by comprising three layers of films which are sequentially attached, each of the first-layer film and the third-layer film comprises the following raw materials in percentage by weight: 89.5-94% of PP, 2-6% of degradable master batch, 0.5-3% of an anti-blocking agent and 1-4% of a slipping agent; the second-layer film is prepared from the following raw materials in percentage by weight: 30 to 35 percent of LLDPE-A, 9 to 14.5 percent of toughening agent, 0.5 to 1 percent of degradable master batch, 40 to 45 percent of LLDPE-B and 10 to 15 percent of metallocene LLDPE; the melt index of the LLDPE-A is 2.5 g / 10min, the melt index of the LLDPE-B is 2.1 g / 10min, the melt index of the metallocene LLDPE is 1.0 g / 10min, and through the synergistic effect between the LLDPE with different melt indexes and the flexibilizer, the low-temperature tear resistance of the heat shrink film is effectively improved.

The invention relates to the technical field of packaging materials, in particular to a PE composite film for manufacturing a packaging bag and a preparation method of the PE composite film. The PE composite film comprises a lower antibacterial PE layer, a middle barrier PE layer and an upper antibacterial PE layer; the lower antibacterial PE layer is prepared from the following raw materials: low-density polyethylene, linear density polyethylene, an antibacterial functional agent, a tensile functional agent and an auxiliary agent; the middle barrier PE layer is prepared from the following raw materials: linear low-density polyethylene, metallocene low-density polyethylene, a tensile functional agent and an auxiliary agent; the upper antibacterial PE layer is prepared from the following raw materials: linear low-density polyethylene, metallocene low-density polyethylene, an antibacterial functional agent and an auxiliary agent, and the PE composite film for manufacturing the packaging bag, prepared by the invention, has excellent antibacterial property and excellent tensile mechanical property; the requirements on antibacterial property and tensile property in the field of packaging materials can be met.

The invention relates to the technical field of polyethylene packaging films, and particularly discloses an antibacterial polyethylene composite packaging film and a preparation method thereof.The antibacterial polyethylene composite packaging film comprises an inner layer, a middle layer and an outer layer, the inner layer is prepared from the following raw materials in parts by weight: 60 to 80 parts of low-density polyethylene, 25 to 35 parts of polypropylene, 4 to 6 parts of modified filler, 0.3 to 0.6 part of antioxidant and 1 to 3 parts of compatilizer; the middle layer is prepared from 62 to 75 parts of high-density polyethylene, 28 to 40 parts of ethylene-vinyl alcohol copolymer, 0.8 to 1 part of anti-binding agent and 2 to 5 parts of compatilizer; the outer layer comprises 55-70 parts of high-density polyethylene, 35-45 parts of metallocene polyethylene, 12-25 parts of nylon, 4-10 parts of antibacterial modified montmorillonite and 3-6 parts of compatilizer, the polyethylene composite packaging film has good processability and good stability, the composite film adopts a double-layer antibacterial design of the inner layer and the outer layer, the middle layer has excellent barrier property and good compactness, and the polyethylene composite packaging film is suitable for being used as a packaging film. The composite packaging film has excellent antibacterial performance and mechanical performance and good comprehensive performance.

The invention relates to a PERT floor heating pipe material and a preparation method thereof, and belongs to the technical field of floor heating pipe preparation. The PERT floor heating pipe material comprises an inner wall and an outer wall, wherein the inner wall is prepared from the following raw materials in parts by weight: 100-200 parts of high-density polyethylene, 20-40 parts of polyamide, 15-18 parts of a carbon-series heat conduction material and 6-8 parts of an antioxidant; the outer wall is prepared from the following raw materials in parts by weight: 100-150 parts of metallocene polyethylene, 30-35 parts of organic silicone powder, 10-13 parts of an antibacterial agent and 8-9 parts of a fluorine-containing polymer; the fluorine-containing polymer is at least one of polyvinylidene fluoride and polyvinyl fluoride. The PERT floor heating pipe material prepared by the invention is high in heat conductivity coefficient, low in inner wall dynamic friction factor, excellent in mechanical property, good in high-temperature hydraulic performance, capable of preventing an inner wall structure and breeding bacteria, long in service life and very high in application value.

A semi-metallocene catalyst and a synthetic method and application thereof belong to the field of chemical engineering. The invention discloses a novel semi-metallocene catalyst which is stable in structure and excellent in heat resistance, and in the presence of a cocatalyst alkoxy aluminum or alkyl aluminum or organic boride, the heat resistance of the semi-metallocene catalyst is greatly improved. Ethylene homopolymerization, propylene homopolymerization, ethylene and alpha-olefin copolymerization, propylene and alpha-olefin copolymerization, ethylene and polar olefin monomer copolymerization, propylene and polar olefin monomer copolymerization or non-polar olefin monomer and polar olefin monomer multi-component copolymerization are efficiently catalyzed at a high polymerization temperature to efficiently prepare a high-end copolymerization olefin material. And synthesizing high-end propenyl elastomers and plastomers, vinyl elastomers and plastomers, styryl copolymers and the like. The method is simple in preparation process, safe, low in cost, convenient to operate, low in equipment requirement, small in energy consumption and small in environmental pollution.

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 discloses a photoaging-resistant thermoplastic polyolefin waterproof coiled material which comprises the following raw materials: basic resin, the material proportion of the basic resin is about 65-75%, and the basic resin comprises high-crystallinity polypropylene, metallocene polyethylene and a cyclic olefin copolymer; the material proportion of the composite stabilizing material and the composite stabilizing agent is about 4-6%, and the composite stabilizing agent comprises a nano cerium oxide coated ultraviolet light absorber, a high molecular weight hindered amine light stabilizer, a novel benzotriazole / triazine hybrid stabilizing agent and a composite antioxidant; the material proportion of the functional filler is about 18-22%, and the functional filler comprises silane coupling agent modified nano kaolin, titanate treated calcium carbonate and graphene modified glass beads; and the material proportion of the special auxiliary agent is about 3-5%, and the special auxiliary agent comprises a hyperbranched polyester plasticizer, a phosphorus-nitrogen intumescent flame retardant and a fluorine surfactant. Compared with the prior art, the invention has the advantages of strong weatherability, high tensile strength and fracture resistance.

The present disclosure relates to a metallocene-catalysed multimodal polyethylene polymer (P), and to methods and uses of the multimodal polymer (P) of ethylene in film applications, and to a film including the disclosed polymer (P).

The invention discloses a halogen-free flame-retardant tunnel waterproof board, which is prepared from the following component raw materials in parts by mass: 100 to 120 parts of high-density polyethylene, 10 to 15 parts of ethylene-vinyl acetate copolymer, 4 to 5 parts of maleic anhydride grafted polyethylene, 15 to 20 parts of modified antistatic flame retardant, 20 to 25 parts of linear low-density polyethylene and 30 to 35 parts of metallocene polyethylene. The prepared halogen-free flame-retardant tunnel waterproof board uses the halogen-free flame retardant expansible graphite, is small in environmental pollution and good in flame retardant property, synergistically improves the flame retardant property by compounding the metal organic framework with a porous structure on the surface of the expansible graphite, and improves the flame retardant property by combining the composite expansible graphite and the carbon nanotubes on the acidified carbon fibers. And the carbon fibers are staggered to form a path, so that the conductivity is improved, and the antistatic performance of the halogen-free flame-retardant tunnel waterproof plate is improved.

Sulfated bentonite compositions are characterized by a total pore volume from 0.4 to 1 mL / g, a total BET surface area from 200 to 400 m2 / g, and an average pore diameter from 55 to 100 Angstroms. The sulfated bentonite compositions also can be characterized by a d50 average particle size in a range from 15 to 50 μm and a ratio of d90 / d10 from 3 to 15. The sulfated bentonite compositions can contain a sulfated bentonite and from 10 to 90 wt. % of colloidal particles, or the sulfated bentonite compositions can contain a sulfated bentonite and from 0.2 to 10 mmol / g of zinc and / or phosphorus. These compositions can be utilized in metallocene catalyst systems to produce ethylene based polymers.

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

The invention discloses a metallocene polypropylene synthesis catalytic performance prediction method, which comprises the following steps: data collection: collecting experimental data of metallocene catalyst synthesis polypropylene, and establishing a data set containing input variables and output variables; data preprocessing: cleaning, standardizing and coding experimental data; feature engineering: carrying out feature correlation analysis on the preprocessed data; model construction: constructing independent prediction models for predicting catalyst activity, number-average molecular weight and molecular weight distribution by using a plurality of machine learning algorithms respectively; performing hyper-parameter optimization: performing hyper-parameter optimization on the prediction model by adopting a Bayesian optimization algorithm to obtain an optimal model parameter; model evaluation: evaluating the performance of the prediction model by adopting a cross validation method; and predicting: inputting process parameters and catalyst ligand parameters input by a user into the optimized and evaluated optimal prediction model, and outputting predicted values of catalyst activity, number-average molecular weight and molecular weight distribution.

The invention relates to a high-toughness low-adhesive-residue composite UV film for semiconductor packaging and a preparation method thereof.The film is composed of a PO base material layer, an antistatic layer and a UV bonding layer from top to bottom, and the PO base material layer is of a three-layer co-extrusion PO film structure; the anti-static layer is specifically composed of outer-layer metallocene polyethylene, middle-layer ethylene-octylene copolymer-polyolefin and inner-layer maleic anhydride grafted polypropylene-polypropylene, the anti-static layer is composed of carbon nanotubes, ionic liquid and a polyisocyanate curing agent, and the UV bonding layer is composed of urethane acrylate oligomer, isobornyl acrylate and hollow siloxane microspheres. The composite UV film designed by the invention not only can provide high toughness and low adhesive residue, but also can realize the dual functions of static resistance and mechanical buffering, thereby effectively solving the problems of crystal grain offset, large stripping force, adhesive residue pollution, cutting edge breakage and the like in the cutting process of the existing protective film, and improving the packaging quality and production efficiency of semiconductor chips.

The invention relates to a light-transmitting polypropylene material, a preparation method thereof and an automobile bumper. The light-transmitting polypropylene material is prepared from the following raw materials in parts by weight: 60 to 70 parts of metallocene atactic polypropylene, 10 to 20 parts of propylene-ethylene copolymer elastomer and 10 to 20 parts of mica powder. According to the light-transmitting polypropylene material, by adjusting the proportion of the metallocene atactic polypropylene, the propylene-ethylene copolymer elastomer and the mica powder, the light-transmitting polypropylene material can keep higher light transmittance on the premise of having high toughness and high rigidity.

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.

The present disclosure relates to a composition including a specific metallocene-catalysed multimodal polyethylene copolymer and a polyethylene wax, to the use of the composition in film applications and to a film including the composition.

The invention provides a high-toughness bundling grating and a production process of the high-toughness bundling grating. The composite material is prepared from the following raw materials in parts by weight: 32 to 42 parts of epoxy modified unsaturated polyester resin, 26 to 36 parts of alkali-free glass fiber, 7 to 11 parts of metallocene polyolefin, 5 to 9 parts of high-branching-degree polyolefin, 4 to 8 parts of ethylene propylene diene monomer, 2.5 to 5.5 parts of core-shell structure elastomer toughening agent, 1.5 to 4.5 parts of modified nano aluminum nitride-graphene composite filler, 0.7 to 1.1 parts of silane coupling agent and 0.5 to 0.9 part of antioxidant. 0.4 to 0.7 part of ultraviolet stabilizer, 0.4 to 0.8 part of calcium stearate and 0.1 to 0.3 part of conductive additive. According to the invention, the core-shell structure elastomer toughening agent realizes toughening without damaging strength through core-shell synergy, and the impact strength is improved by 40% or above; the modified nano aluminum nitride-graphene composite filler constructs a heat conduction-antistatic network, and the modified nano aluminum nitride-graphene composite filler and the metallocene polyolefin are matched with the high-branching-degree polyolefin and the ethylene propylene diene monomer to enhance low-temperature toughness and creep resistance.