153 results about "Polyethylene matrix" patented technology

A heat-shrinkable article suitable for use as an insulating or coating material comprises a crosslinked composition of a polypropylene homopolymer or copolymer and an ethylene-propylene elastomer. The article is formed by a process comprising: i) creating a blend of the polypropylene homopolymer or copolymer and the ethylene-propylene elastomer by melt mixing; ii) melt processing the blend produced in i) to produce a melt processed material; iii) crosslinking the melt processed material produced in ii) by exposing it to radiation to produce a crosslinked material; iv) stretching the crosslinked material at a first temperature close to or above its softening or melting point and subsequently cooling it to a second temperature below its softening or melting point, to thereby freeze the crosslinked material in its stretched form. Subsequent heating of the article close to or above its softening point or crystalline melting point results in recovery of the pre-stretched dimensions of the article. Due to its relatively high content of polypropylene, the heat-shrinkable article thus produced has greater toughness and rigidity than polyethylene-based systems, making it suitable for use as insulation for wires and cables a heat-shrinkable corrosion resistant sleeves for high-temperature transmission pipeline joints, and for heat-shrinkable tubing or shapes for electrical insulation and mechanical protection.

The invention discloses a vehicle using high molding quantity filling sound insulation damping noise reduction sheet material and the manufacture method. It has good sound insulation and noise reduction function, and has simple technology. The raw material includes polyvinyl alcohol resin, coupler, lubricant and powder material that has Mohí»s hardness above 6 as high molding quantity material.

The invention discloses a high-voltage direct-current cable material as well as a preparation method and applications thereof. The high-voltage direct-current cable material is technically characterized by being prepared from low density polyethylene, graft modified polyethylene, core-shell double-component inorganic nanofiller treated by a silane coupling agent, an antioxidant, a cross-linking agent, and an anti-copper agent. The preparation method comprises the following steps: firstly, mixing the low density polyethylene, the graft modified polyethylene, the antioxidant and the anti-copper agent; after melting polyethylene, adding the inorganic nanofiller treated by a silane coupling agent; and then adding the cross-linking agent to obtain a polyethylene nanocomposite. In the polyethylene nanocomposite prepared by the method, the inorganic nanofiller is uniformly dispersed in a polyethylene matrix and is excellent in compatibility with the matrix, and covalent bonds interact with each other, so that the mechanical property and the electrical property of the cable material can be effectively enhanced; the accumulation of charges in the internal space of the cable material can be remarkably inhibited, so that the cable material can serve as an insulating material for high-voltage direct-current cables.

The invention discloses a micro-foaming polyethylene-matrix wood-plastic composite material and a preparation method thereof. The micro-foaming polyethylene-matrix wood-plastic composite material is prepared by the following steps of stirring a matrix polyethylene resin, modified wollastonite powder and talcum powder, a crosslinking agent, a lubricant, a heat balance type foaming agent, an antioxidant, an anti-ultraviolet agent, pigment and modified plant fiber, heating and uniformly mixing, then cooling and discharging to obtain a premix, wherein the modified plant fiber is one of wood powder, bamboo powder and rice hull powder or a mixture of two or more at any proportion; putting the premix into an extruder, and performing granulation, extrusion foaming and cooling formation. The micro-foaming polyethylene-matrix wood-plastic composite material disclosed by the invention is convenient to produce and manufacture, the raw materials are cheap and environment-friendly, the average diameter of the pores of the micro-foaming polyethylene-matrix wood-plastic composite material is reduced to 10 microns, and the content of the plant fiber is increased to 45%; moreover, the composite material has low density and high bending strength and impact toughness, is widely applicable and can be applied to the fields such as decoration, building, municipal administration, packaging, automotive upholsteries and the like.

The invention discloses a preparation method of long chain branched polyethylene. The preparation method comprises the following steps of: A, under the action of an initiator, performing a graft reaction on a vinyl monomer containing a polyfunctional group, and a polyethylene substrate under the synergistic action of a second olefin monomer to obtain grafted polyethylene of which the side chain is provided with a functional group; B, and performing a branching reaction on the grafted polyethylene obtained in the step A and an additive to obtain long chain branched polyethylene in which the additive is taken as a core and a polyethylene macromolecule is taken as an arm. Due to the adoption of the preparation method disclosed by the invention, long chain branched polyethylene with high melt strength can be produced, the branching degree is relatively controllable, the cost is low, the production efficiency is high, and superior foaming performance is realized. Expanded polyethylene with various functionality such as a wood-plastic composite expanded material added with wood fiber, an enhanced polyethylene expanded material added with glass fiber, a fire-proof polyethylene expanded material added with an expansion flame retardant and the like can be prepared according to different use requirements.

The invention provides a hydrophilic polyethene microporous membrane and a preparation method thereof, belonging to a polyethene microporous membrane containing blending compatilizer with a polar group, calcium carbonate and thinner and a preparation method thereof. In the preparation method of the microporous membrane, polyethene, blending compatilizer, calcium carbonate and thinner are taken as raw materials; and hydrophilic polyethene microporous membrane is finally prepared by blending processing, membrane pressing by a flat bed presser, quenching by water bath in constant temperature, extracting by extracting agent, acid cleaning, washing and drying. The invention is characterized in that the blended compatilizer with a polar group is selected to react with the calcium carbonate particles, calcium carbonate particles are evenly filled into polyurethane base body through blending processing; and porous structures are formed by the thermal induced phase separation method and the method for removing fillings by acid cleaning. As for the hydrophilic polyethene microporous membrane prepared by the method, the range of the internal average aperture is 0.1-10mu m, the aperture rate is greater than 50% and the contact angle is less than 80 degrees.

The invention belongs to the technical field of functional polymer materials and insulating material, in particular to a new environment protection ant and rat defending type cable sheathing material and a preparation method thereof. The invention increases the hardness and wear-resisting property of the polyethylene cable sheathing material by adding non-toxic high-efficient intensifier into polyethylene matrix resin, thus achieving the function of the ant and rat defending. Meanwhile, the sheathing material has good mechanical property. The preparation method for the insulating material described by the invention has good controllability, simple technique, and lower cost and has wide application prospect in electrical wire and cable industries.

The invention relates to dealkalized red mud-containing flame-retardant polyvinyl plastic and a preparation method thereof, and belongs to the technical fields of dealkalization and comprehensive utilization of red mud and flame-retardant plastic. Polyethylene and an in-situ dealkalizing agent are used as resin bases, and the red mud is used as a flame retardant. The method comprises the following steps of: crushing the red mud; drying; grinding and sieving; adding the red mud into an internal mixer with the polyethylene and the in-situ dealkalizing agent for melting and internal mixing; and machine-shaping with a flat vulcanizing machine to obtain a flame-retardant polyvinyl plastic finished product, wherein the plastic has smooth appearance, the pH value is between 9 and 11, and the limiting oxygen index ranges from 23 to 31 percent. The polyvinyl plastic prepared by the method is suitable for fire disaster safety protection in important public places in the fields of electronic appliances, building materials and traffic; a dealkalization process used for the red mud serving as the flame retardant is simplified by in-situ dealkalization; the in-situ dealkalizing agent can effectively reduce the alkalinity of the red mud, improve the flame-retardant effect and improve the compatibility between the red mud and the polyethylene base; and the polyvinyl plastic is low in cost and causes small damage to environment.

The invention provides a manufacture process of a steel wire mesh framework composite pipe. A steel wire mesh framework layer is formed by adopting bare steel wires through weaving, the steel wire mesh framework layer and a polyethylene base body material are melted together by using resin in a molten state in a process of producing the composite pipe without causing quality hidden dangers such as spinning, and an inner-layer polyethylene pipe extruding machine and an outer-layer polyethylene pipe extruding machine and a mould are integrated, thus the production efficiency is greatly increased and the production cost is lowered.

The invention relates to a graphene-modified polyethylene flame-retardant composite material and a preparation method thereof. The preparation method comprises the following steps of uniformly mixing a polyethylene matrix, modified graphene, a silicon and phosphor compound flame retardant agent, a synergistic enhancer, a filler, a toughener and an additive in a mixing machine, and performing injection molding by an injection molding machine, so as to obtain a final product, namely the graphene-modified polyethylene flame-retardant composite material. The modified graphene is prepared by treating graphene oxide by phosphonitrilic chloride trimer; the synergistic enhancer is prepared by mixing a carbon nanotube and modified titanium dioxide; the filler consists of modified glass fiber and modified nanometer silicon dioxide; under the synergistic action of the modified graphene, the silicon and phosphor compound flame retardant agent, the synergistic enhancer and the filler, the graphene-modified polyethylene flame-retardant composite material is prepared. The preparation method has the advantages that the preparation technology is simple; the additive component has no pollution to environment; the prepared polyethylene composite material can meet the requirement of mechanical strength, and can realize the flame retardant effect; the use range of the polyethylene is widened.

The invention relates to the technical field of functionalization and high performance of plastic pipes, in particular to a graphene modified oxygen-resistant polyethylene master batch and a preparation method and application thereof. The modified plastic master batch is composed of the following components: a polyethylene matrix, graphene, a second oxygen inhibitor, a coating agent, a surface treating agent, a dispersing agent and an antioxidant. According to the three-step production process, the mixing, dispersing and stripping effects of graphene in a polyethylene matrix are improved, thefilling proportion of graphene in the composite material is increased through organic combination of a new material, a new technology and a new method, and formation of a perfect network structure inthe composite material matrix is promoted. The oxygen barrier property of the composite material can be remarkably improved through good construction of a network, so that the application potential ofgraphene in the oxygen barrier pipe is brought into full play, and the pipe filled with the high-barrier graphene nanosheet layer structure is obtained.

The present invention relates to flameless heating apparatus for food products. In particular, it relates to an improved potentially exothermic mixture/blend for such heaters and to meal packages including foods and heating apparatus. An embodiment of the invention comprises a composite material consisting of a potentially exothermic metallic alloy powder dispersed throughout a porous polyethylene matrix, which releases hydrogen in an exothermic reaction. The present invention seeks to reduce the production of such gas per unit mass, and further seeks to improve the efficiency of the reaction.

The invention provides a heat-conductive polyethylene composite material and a preparation method thereof. The composite material comprises the following components in parts by weight: 15 to 50 parts of polyethylene, 4 to 35 parts of heat-conductive fibers and 23 to 80 parts of heat-conductive granules. The heat-conductive fibers taken as heat-conductive filling materials are added into the polyethylene substrate, so that the heat-conductive polyethylene composite material is formed. Compared with granular heat-conductive filling materials, according to the composite material provided by the invention, after the fibriform heat-conductive fibers enter the polyethylene substrate, an overlapping state can be easily formed between the heat-conductive fibers and the polyethylene substrate, so that the formed overlapping network can easily pass through the whole polyethylene substrate; and thus, the heat in the substrate can be rapidly dispersed under the heat-conductive action of the overlapping network, thereby being favorable for improving the heat transfer efficiency of the composite material. Meanwhile, after the heat-conductive granules are added, the heat-conductive granules can be used for enwrapping joints among the different heat-conductive fibers, so that strong heat-conductive channels are formed among the heat-conductive fibers.

The invention relates to a preparation method of a nanoporous high-efficiency heat-insulating polyethylene film, by which the nanoporous high-efficiency heat-insulating polyethylene film is prepared from nanometer aerogel powder as an inorganic filler and polyethylene powder as a main raw material. The preparation process comprises the following main steps: performing surface modification on the nanometer aerogel powder, preparing masterbatch, casting the film and the like. Through certain technical characterization, the fact that the nanometer aerogel powder is uniformly dispersed in a polyethylene matrix is proved. Compared with the conventional polyethylene film, the nanoporous high-efficiency heat-insulating polyethylene film provided by the invention has the advantages as follows: theheat conductivity of the nanoporous high-efficiency heat-insulating polyethylene film doped with 3% of the aerogel powder is decreased by 26.1%, and the tensile strength and the elongation at break are not changed too much. Decrease in the heat conductivity indicates increase in heat-preserving and heat-insulating properties of the film, so that the film prepared by the preparation method provided by the invention has a very good application prospect in the field of heat preservation and heat insulation.

The invention discloses a preparation method for a high-strength flame-retardant wood-plastic floor, and belongs to the technical field of preparation of floors. According to the method provided by the invention, sepiolite and a phosphoric acid solution are mixed and dispersed to obtain a flame-retardant functional mother liquor, a dimethyl sulfoxide solution of E-51 epoxy resin is added dropwiseinto an alkalizing solution of beta-cyclodextrin for a reaction to obtain nano fibers, polyethylene masterbatch particles are subjected to rubber mixing for melting, a wood and stone fiber sponge is mixed, the obtained material is injected into a hot pressing mold for hot pressing to obtain the high-strength flame-retardant wood-plastic floor, lignin is adsorbed on the fiber surface and in the pores to enhance interfacial bonding force of the lignin and sepiolite fibers, and therefore the compressive strength of the wood-plastic floor is improved; and the nano fiber sponge is prepared by soaking of resin in the flame-retardant functional mother liquor, sepiolite powder in the flame-retardant functional mother liquor is a magnesium-enriched silicate compound, the compound can form a magnesium hydroxide crystal and ammonium phosphate under the action of an ammonia gas and phosphoric acid, the integrity of a polyethylene matrix skeleton is maintained, oxygen supply during combustion is insufficient, combustion is quickly stopped, and therefore the better flame retardant effect on the wood-plastic floor is achieved.

The invention relates to the field of polyethylene composite materials, in particular to a preparation technology for a carbon nanotube/nickel/aluminum in-situ enhanced polyethylene based composite material, and aims to provide a method for keeping controllable contents and uniform dispersion and distribution of the carbon nanotubes and metal composite powder in a polymer based composite materialand keeping good interface infiltration of carbon tubes and a base and high binding strength. The method comprises the following steps of: synthesizing CNTs (Carbon Nanotubes)-Ni-Al composite powder with uniformly dispersed CNTs, excellently kept structure and controllable content by using a chemical vapor deposition method; and doping the in-situ composite powder into a polyethylene base by using a melt blending method so as to prepare the CNTs/Ni/Al/polyethylene based composite material with high strength and modulus and excellent conductivity and heat-conducting property. By adopting the composite powder, the proportion of the carbon nanotubes, nickel and aluminum can be controlled excellently; meanwhile, the problem of dispersion of the metal and the carbon nanotubes in the composite material can be solved well; the carbon nanotubes do not agglomerate in the composite powder and are widely dispersed to achieve a nano-size effect; and the carbon nanotubes have high binding strengthwith the base, so that the polyethylene based composite material can be effectively enhanced by the carbon nanotubes and the aluminum, and the comprehensive performances such as strength, conductivity, heat conduction and the like of the composite material are greatly improved.

The invention discloses adhesive resin for steel-mesh reinforcing polyethylene hot water pipe. The adhesive resin comprises, by weight, 5-50% of polyethylene grafts, 20-80% of polyethylene matrix resin, 5-60% of heat-proofness enhancing particles and 1-30% of elastomer toughening particles, and the total percentage of the components is 100%. The invention further discloses a preparation method of the adhesive resin. The adhesive resin prepared is good in heat resistance, steel-mesh adhesive effect is good, vicat softening point reaches more than 120DEG C, heat distortion temperature reaches above 95DEG C, and peel strength at the temperature of 85DEG C reaches more than 100N/cm.

The invention relates to an antibacterial polyethylene foamed plastic and a preparation method thereof. The composition provided by the invention comprises blended polyethylene base resin, a composite antibacterial agent and a chemical foaming agent, wherein in terms of 100 parts by weight of polyethylene, the amount of the composite antibacterial agent is 0.2-2 parts by weight; the polyethylene base resin is selected from polyethylene with high melt strength or linear low-density polyethylene with a long chain branch structure; and the composite antibacterial agent is a polyguanidine/polysilicate composite antibacterial agent, which is prepared by mixing an aqueous solution of a water-soluble polyguanidine inorganic acid salt or organic acid salt with an aqueous solution of a water-soluble silicate and adding an aqueous solution of a water-soluble metal salt, the molar ratio of the water-soluble polyguanidine inorganic acid salt or organic acid salt to the water-soluble silicate is (10:1)-(1:50) and the molar ratio of the water-soluble silicate to the water-soluble metal salt is (5:1)-(1:3). The polyethylene foamed plastic material composition provided by the invention has the advantages of high sterilization efficiency, high water washing resistance, stable performance and the like.

The invention relates to a preparation method of nano-silica with the surface grafted with polystearylmethacrylate, belonging to the field of surface grafting and modification of nano-particles. The preparation method comprises the following steps of firstly grafting amino silane to the surface of nano-silica in a high polar solvent by virtue of a reversible addition-fragmentation chain transfer polymerization method; then grafting a chain transfer agent to the surfaces of nano-particles through amino silane by virtue of the combination between thiol ester functional groups and amino functional groups on the chain transfer agent; finally providing free radicals by an initiator, and polymerizing monomers of polystearylmethacrylate to the tail end of the chain transfer agent. According to the polystearylmethacrylate-grafted nano-silica nano-particles prepared by virtue of the preparation method, the dispersity of nano-silica in low density polyethylene and a crosslinked polyethylene matrix is improved. According to the preparation method, a firm foundation is laid for the further improvement of mechanical and electrical properties of polyvinyl nano-composite materials.

The invention relates to a polydimethylsiloxane carbon black master batch and a preparation method thereof, and solves the technical problems of high performance reduction, reduction of product glossiness, accumulation of materials in a mouth mold in the extrusion of the product and affection on continuous production due to adoption of a polyethylene matrix resin and a low-molecule dispersing agent in the prior art. The polydimethylsiloxane carbon black master batch provided by the invention comprises the following mixed components: a, 100 parts by weight of polydimethylsiloxane; b, 50-400 parts by weight of modified carbon black; c, 10-100 parts by weight of hydrated silica; and d, 0.1-15 parts by weight of antioxygen. The invention also provides the preparation method of the polydimethylsiloxane carbon black master batch. The polydimethylsiloxane carbon black master batch and the preparation method of the polydimethylsiloxane carbon black master batch can be applied in the field of preparation of the carbon black master batch.

The invention relates to a rat-proof biobased garbage bag and a preparation method thereof. The rat-proof biobased garbage bag comprises the following components in parts by mass: 20-70 percent of polyethylene, 15-60 percent of starch, 5-10 percent of plasticizer, 5-10 percent of rat-proof repellent and 0.5-2 percent of color master batch. The preparation method of the degradable rat-proof biobased garbage bag comprises the following steps of: preparing a required biobased material from the polyethylene, the starch, the the plasticizer and the rat-proof repellent according to a specific production process; and matching the biobased material with the color master batch and carrying out secondary processing to obtain the degradable rat-proof biobased garbage bag. In the invention, the polyethylene is filled with the thermoplastic starch, so that the thermoplastic starch is uniformly dispersed in a polyethylene matrix; then a polyethylene modified material is disintegrated into fragments along with the biodegradation of the starch, so that the polyethylene modified material has a certain biodegradability; and due to the utilization of the plasticizer, the starch has thermoplasticity, so that the machinability of the starch and the compatibility of polyethylene matrix resin are improved.

The invention relates to a high impact linear low density compound material of polyethylene/molecular sieve as well as a preparation method thereof. Ethylene is used as a monomer; an ethylene in-situ copolymerization activating system consisting of loading ethylene oligomerization catalyst and loading metallocene catalyst is used as the catalyst; the ethylene oligomerization catalyst is an Alpha-double imine pyridine iron compound the carrier of which is a mesoporous molecular sieve; a metallocene compound is used as copolymerization catalyst the carrier of which is the mesoporous molecular sieve; an alkyl aluminium compound is used as cocatalyst; the loading ethylene oligomerization catalyst generates Alpha-olefin in the pore canal of the molecular sieve and then is copolymerized with the ethylene under the effect of the copolymerization catalyst; simultaneously the carrier of the molecular sieve is uniformly dispersed on a polythene substrate to form a high impact linear low density compound material of polyethylene/molecular sieve with an excellent shape; the bulk density is larger than 0.35g/cm<3>; the molecular weight is larger than 100,000g/mol; the polydispersity index is larger than 4; the Izod gap impact intensity is larger than 500J/m.