116results about How to "Uniform toughness" patented technology

The invention relates to a wear-resistant crosslinked PE (Polyethylene) composite pipe and a manufacturing method thereof, belonging to the technical field of PE pipes. The composite pipe is obtained by fusing, extruding and pelletizing 100 parts of PE, 1-3 parts of scratch-resisting agent, 0-10 parts of carbon fiber, 0-5 parts of elastomer, 0.05-0.2 part of antioxidant, 0.2-1 part of crosslinkedaccelerating agent and 0.5-1 part of lubricating agent with double screws, performing vacuum drying, spraying a silane crosslinking agent and extruding by an extruder. By adopting a chemical modification method, the connection of a PE molecular chain is enhanced, a three-dimensional network structure is formed, and the creep resistance and surface solid particle impact resistance of a material are enhanced. By adopting a physical modification technology, the scratch-resisting agent and a reinforcing agent are compounded in a PE material, a PE crosslinked composite material with balanced toughness, strength and hardness is obtained, the wear resistance, heat resistance, tensile strength and elongation percentage of PE are enhanced, and the PE pipe is suitable for conveying powder, solid particles and slurry and has wide market prospect.

The present invention relates to one kind of polyamide / acrylonitrile-butadiene-styrene copolymer alloy and its preparation process. The polyamide / acrylonitrile-butadiene-styrene copolymer alloy is prepared with polyamide 35-60 wt%, acrylonitrile-butadiene-styrene copolymer 8-50 wt%, compatilizer 2-10 wt%, flexibilizer 2-15 wt%, antioxidant stabilizer 0.2-2 wt%, lubricant 0.3-3 wt%, and nucleator 0.1-2 wt%. The preparation process includes weighing the materials based on the weight proportion, mixing in a high speed mixer for 1-4 min, mixing, melting and extruding in a double screw extruder, and pelletizing. The polyamide / acrylonitrile-butadiene-styrene copolymer alloy has simple processing and molding process and high performance.

The present invention belongs to an improvement on lining material of bottle cap and its application in the thermofilled beverage plastic bottle cap. Said bottle cap lining material is made of EVA modified maleic acid, SEBS (hydrophenylethylene diene copolymer), hydrogenated paraffin oil, branching low-density polyethylene, polypropylene, polystyrene and low-molecular lubricant through a certain preparatino process. As compared with traditional lining material it has excellent performance and low cost.

The invention provides an anti-aging impact-resistant modified wood-plastic composites (WPC) and a preparation method thereof. The wood-plastic composites are prepared from the following raw materials in parts by weight: 20-50 parts of polyolefin, 30-70 parts of enzymatic hydrolysis lignin modified vegetable fibers, 1-3.5 parts of polymerized rosin, 0.1-10 parts of an inorganic filler, 0.1-4 parts of an antioxidant, and 0.1-3 parts of an ultraviolet screening agent, wherein the enzymatic hydrolysis lignin modified vegetable fibers are prepared from enzymatic hydrolysis lignin and vegetable fibers through an anhydride reaction. According to the modified wood-plastic composites prepared by the invention, the affinity between the vegetable fibers and plastic is high, the dimensional stability of the composites is high, the rigidity and toughness are balanced, and ageing resistance is also improved at the same time; in the process of preparing the enzymatic hydrolysis lignin, a certain amount of ligninase is added, thus improving the impact resistance of the wood-plastic composites prepared from the enzymatic hydrolysis lignin modified vegetable fibres. Through the method of using the lignin to modify the vegetable fibers provided by the invention, lignin resources are fully used, waste is turned into treasure, and comprehensive utilization of the lignin resources is realized.

The invention is applicable to the technical field of plastics, and provides a polypropylene composite material and a preparation method thereof. The polypropylene composite material comprises the following components in percentage by mass: 90-96% of polypropylene, 0.5-1% of inorganic filler, 1-2% of a complex of a silane coupling agent and a titanate coupling agent, 1-2% of dispersing agent and 1-2% of antioxidant. The polypropylene composite material provided by the invention uses the silane coupling agent and the titanate coupling agent together, thus uniformly dispersing the inorganic nano filler in the polypropylene composite material, effectively preventing the inorganic nano filler from glomeration and realizing the balance between the toughness and rigidity of the polypropylene composite material. The preparation method of the polypropylene composite material provided by the invention is simple to operate, has the advantages of low cost and high production benefit, and is especially suitable for industrial production.

The invention discloses an inflaming-retarding tear-resisting fireproof cable material.The inflaming-retarding tear-resisting fireproof cable material is prepared from, by weight, 30-50 parts of neoprene, 20-35 parts of polyvinyl chloride, 5-15 parts of ethylene propylene diene monomer, 0.5-1.5 parts of peroxysuccinic acid, 0.5-1 part of tert-butyl hydrogen phthalate, 0.2-0.8 part of tetramethylthiuram disulfide, 0.4-1.2 parts of 1,3(1,4)-bis(tert-butyldioxyisopropyl)benzene, 40-60 parts of fast extruding furnace black, 20-30 parts of ceramic fiber, 5-15 parts of hard pottery clay, 5-15 parts of modified activated carbon, 1-3 parts of antiager, 0.4-0.8 part of polyvinyl butyral, 1-2 parts of stearic acid, 1-2 parts of polyethylene wax and 0.5-1.5 parts of epoxidized soybean oil.The inflaming-retarding tear-resisting fireproof cable material has good inflaming-retarding property and excellent waterproof performance and tear-resisting performance.

The invention discloses a toughened glass insulator and a fabrication method thereof. The insulator at least can resist lightning steep slope peak 6,000kV / s and can stand repeated circulation impact of -50 to 50 DEG C in a standard load condition, a standard load can be still supported after self explosion at 0 DEG C, the surface pressure stress is not lower than 150Mpa, the impact strength of an U-shaped gap is not lower than 20J / cm<2>, and the light transmittance is not lower than 98%. On the basis that lead glass belonging to toughened glass, lanthanum oxide and bismuth oxide which are used for improving chemical stability and light transmittance of glass are added, zirconium oxide and titanium oxide which are used for improving acid and alkali resistance, light transmittance and radiation protection capability of the glass are also added, and the toughened glass insulator is finally fabricated through tempering under the protection of nitrogen. The toughened glass insulator has the advantages of good electrical property, high automatic fracture toughness, high light transmittance, good integrated mechanical property, long service lifetime and good economy.

The invention discloses a thermoplastic elastomer special for a yoga belt and a preparation process thereof, and belongs to the technical field of plastic materials. The thermoplastic elastomer comprises 35-50 parts of SEBS; 50-65 parts of white oil, 5-15 parts of polypropylene, 5-10 parts of a POE elastomer, 3-8 parts of silicone masterbatch, 8-10 parts of a filler, 1-3 parts of a first auxiliary, 3-5 parts of a stabilizer and 0.2-0.3 part of a second auxiliary. The first auxiliary includes at least one of erucylamide and oleamide. The second auxiliary includes at least one of an anti-ultraviolet absorbent and an antioxidant. The thermoplastic elastomer has advantages of excellent elasticity, strength and toughness, no odor and good touch sense.

The invention discloses a beer crown cap polyolefin gasket granule which is composed of 20-38 parts of LDPE (low-density polyethylene), 20-38 parts of HDPE (high-density polyethylene), 10-15 parts of PP (polypropylene), 0-12 parts of SBS (styrene-butadiene-styrene), 0-12 parts of SEBS (styrene-ethylene-butadiene-styrene), 0-12 parts of POE (polyolefin elastomer), 0-12 parts of TPV (thermoplastic vulcanizate) and 2-5 parts of OPE (oxidized polyethlene). All the raw materials are blended and extruded to obtain the beer crown cap polyolefin gasket. All the raw materials of the gasket material are food grade, and are completely free of PVC (polyvinyl chloride) or any plasticizer, thereby ensuring the safety of beer food and being beneficial to human health. The gasket material completely conforms to the performance requirements for the gasket material in the national standard, and especially the pressure resistance, slow leakage resistance and the like are greatly higher than the national standard. The production method is simple in technique, all equipment is universal polymer processing equipment and available for the original PVC gasket material production equipment, and the method is easy for popularization and application.

The invention discloses a high performance computer cable sheathing compound, which comprises raw materials with parts by weight: polypropylene 20-40 parts, polyvinyl chloride 30-50 parts, ethylene propylene terpolymer 20-40 parts, succinic acid peroxide 0.5-0.9 part, tert-butyl hydrogen phthalate 0.8-1.5 parts, sodium dichromate ammoniums 2-5 parts, accelerants DM 0.2-0.8 part, carbon fibers 26-34 parts, silica 20-50 parts, hard clays 30-50 parts, modified cotton short fibers 25-45 parts, anti-aging agents 1-2 parts, polyvinyl butyral 1.2-1.8 parts, stearic acids 1-3 parts, trioctyl phosphates 0.5-1.8 parts and aromatic hydrocarbon oil 1.2-2.3 parts. The high performance computer cable sheathing compound is excellent in flame retardant efficiency, and is extremely excellent in mechanical property.

The invention discloses a preparation method of an artificial stone for building external walls. The method comprises the steps of: mixing quartzite, reflective powder, and epoxy modified polyester resin evenly, spreading the mixture evenly on a die to obtain a first prefabricated material; mixing unsaturated polyester resin, benzoyl peroxide, dodecyl mercaptan and phenyltriethoxysilane, adding aluminum hydroxide, mica powder, modified collagen protein, a pigment, metakaolin, water glass, lignocellulose, carbon fiber, steel fiber, limestone, fly ash and water, mixing the substances evenly, and spreading the mixture uniformly on the first prefabricated material so as to obtain a second prefabricated material; and sending the second prefabricated material into a press to conduct vacuum pressing, then sending the product into a drying room to perform heat insulation, carrying out natural cooling to room temperature, and then conducting die removal, polishing and cutting to obtain the artificial stone for building external walls.

A process for modifying the surface of multi-porous Ni-base material as the cathode for fuel battery of fused carbonate includes such steps as preparing LiCoO2 nanometre powder by the sol-gel method, modifying the multi porous Ni-base material with LiCoO2 Nanometre powder by the electrophoretic deposition method, and calcining at 100-650 deg.C. Its advantages are high strength and toughness, high uniformity of LiCoO2, and long service life.

There is provided a core-sheath bicomponent polyester monofilament, wherein a core component is composed of polyethylene terephthalate (PET) and a sheath component composed of PET having an intrinsic viscosity (IV) at least 0.2 lower than that of the core component, the polyester monofilament having a fineness of 3 to 8 dtex, a strength of 7.5 cN / dtex or more, a toughness (strength×elongation0.5) of 29 or more, and a longitudinal yarn fineness variation of 1.5% or less.

The invention discloses a high-performance cable used for a computer. The raw material of the sheath of the cable includes the following parts by weight: 30-50 parts of butyronitrile rubber, 5-10 parts of butylbenzene rubber, 20-30 parts of butadiene rubber, 1-2 parts of diisooctyl phthalate, 0.4-0.8 part of aromatic hydrocarbon oil, 0.2-0.6 part of naphthenic oil, 30-40 parts of modified kaoline, 10-14 parts of pottery clay powder, 40-60 parts of white carbon black, 5-12 parts of graphite, 2-5 parts of polyvinyl butyral, 2-6 parts of octyl-phenolic tackifying resin, 1-2 parts of antioxidant AT-215, 0.5-1.5 parts of ultraviolet absorber UV-531, 0.6-1 part of ultraviolet absorber TB75, 0.5-1 part of oleic acid, 1-2 parts of stearic acid, 0.6-1 part of ammonium dichromate, 0.5-1 part of sodium dichromate ammonium, 0.5-1 part of potassium dichromate ammonium and 1-2 parts of dibenzothiazyl disulfide. The high-performance cable used for the computer is high-temperature-resistant and excellent in mechanical property.

The invention discloses a preparation method of heatproof seal rubber for capacitors. The method comprises the following steps: uniformly mixing styrene butadiene rubber, nitrile silicone rubber, polycarbonate, a talcum powder compound, hard clay, glass fibers, pine tar, microcrystalline paraffin, lauric acid, oleic acid and an antioxidant BHT to obtain a rubber compound; and adding a vulcanizingagent to the rubber compound, uniformly mixing the obtained mixture, vulcanizing the mixture at 185-195 DEG C for 2-4 min, and performing extrusion molding to obtain the heatproof seal rubber for capacitors. The seal rubber prepared through the preparation method of the heatproof rubber for capacitors forms a highly-crosslinked network structure, and has the advantages of excellent heat stability,excellent mechanical performances and high impact strength.

The invention discloses a novel multifunctional PVC hanging plate for product storage. The novel multifunctional PVC hanging plate is prepared from, by weight, 15-25 parts of Makrolon, 8-16 parts of high density polyethylene, 25-40 parts of PVC resin, 15-25 parts of lignin, 20-40 parts of montmorillonoid, 12-18 parts of wollastonite, 10-20 parts of modified composite particles, 1-2 parts of zinc stearate, 1.5-2.5 parts of N,N-m-phenylenedimaleimide, 2-4 parts of ammonium-potassium dichromate, 1-2 parts of benzoyl peroxide, 0.5-0.8 part of zinc oxide, 2-4 parts of tributyl citrate, 1-2 parts of microcrystalline wax, 2-3 parts of coal tar, 3-4 parts of stabilizer, 1.5-2.5 parts of foaming agent and 2-3 parts of antioxygen 264. The novel multifunctional PVC hanging plate for product storage has excellent abrasion resistance and aging resistance.

The invention discloses a heat-resistant aluminum alloy high-voltage electric power cable comprising a cable core, an insulating layer, a shielding layer and a jacket layer, wherein the insulating layer covers outside the cable core, the shielding layer covers outside the insulating layer, and the jacket layer covers outside the shielding layer; and the cable core is made of a heat-resistant aluminum alloy lead, and the jacket layer is made of modified butadiene-nitrile rubber. The heat-resistant aluminum alloy high-voltage electric power cable disclosed by the invention is excellent in heat resistance and has excellent wear resistance.

The invention discloses a biological total degradation fecula packing material and its processing method and device in biological degradation material technical domain, which solves now fecula packing material is film product and can not meet the need of market. The biological total degradation fecula packing material comprises by the following steps: compositing with amidon, viscose staple fibre, pulpboard and additive; adding into water; mixing; stirring evenly; injecting materials stored in storage tank into heating mold; foaming; forming; getting end product. The processing device includes storage tank, measuring pump, injection-molded gun and injection-molded machine. This invention possesses smooth surface and light colour, which can degrade completely.

The invention discloses an exterior wall panel with excellent sound-absorbing and fire-proof performance, which comprises a base layer, a sound-absorbing fireproof layer, a plastering mortar layer, a waterproof layer, a decorative coating and a wear-resistant layer; the preparation method of the sound-absorbing fireproof layer is as follows: hydroquinone, Potassium hydroxide and toluene are mixed evenly, and then a toluene solution containing hexachlorocyclotriphosphazene is added dropwise, heated up, kept warm, washed with an alkali solution to obtain an organic phase, then the organic phase is distilled under reduced pressure, dried in vacuum, and recrystallized to obtain material a ; Mix material a and polytetrahydrofuran ether glycol evenly, then add trimethyl-1,6-hexamethylene diisocyanate, fill with dry nitrogen for protection, heat up, keep warm, and cool down to obtain material b; Add trimethylpentanediol, glycerin, bismuth neodecanoate, foaming agent, foaming aid, expanded perlite, palygorskite, diatomaceous earth, glass fiber, flax fiber, zinc borate hydrate, anti-aging agent and Acetone is mixed evenly, coated on the surface of the base layer, then heated up, and kept warm to obtain a sound-absorbing and fire-proof layer.

The invention discloses a PVC artificial leather foaming layer. The PVC artificial leather foaming layer comprises, by weight, 95-105 parts of PVC resin, 30-40 parts of polyphenylene ether ketone, 5-10 parts of nano aluminum oxide, 30-40 parts of plasticizer, 2-3 parts of stabilizer and 4-5 parts of foaming agent. A preparation method of the PVC artificial leather foaming layer includes the steps of firstly, performing primary heating mixing; secondly, performing secondary mixing; thirdly, performing tertiary mixing; fourthly, performing smelting and open milling; fifthly, rolling, and cooling to obtain the PVC artificial leather foaming layer. The PVC artificial leather foaming layer and the preparation method thereof have the advantages that the dimensional stability, strength and toughness of the whole foaming layer are increased, and the foaming layer is good in softness and has certain strength at the same time, and the breathability of the foaming layer is enhanced comprehensively by the porous-structured nano aluminum oxide.

The invention discloses a diesel engine oil pipe seal gasket with high thermal stability. The diesel engine oil pipe seal gasket comprises the following raw materials in parts by weight: 90 to 100 parts of a main material, 4 to 15 parts of a kaolin compound, 8 to 12 parts of coal gangue, 4 to 10 parts of glass fiber, 1 to 2 parts of a cross-linking agent, 1 to 2 parts of tricresyl phosphate, 1 to2 parts of epoxidized fatty acid methyl ester, 0.2 to 0.8 part of chlorinated paraffin, 0.4 o 1.2 parts of disproportionated rosin, 1 to 2 parts of an anti-aging agent SP and 1 to 2 parts of an anti-aging agent AW, wherein the kaolin compound is prepared by adopting the following process: mixing kaolin, sepiolite powder, bentonite, tetrabutyl titanate and water under stirring, adding cocamidopropyl betaine and sodium hydroxide, carrying out uniform mixing, subjecting an obtained mixture to ball milling, filtering, washing and drying so as to obtain the kaolin compound. The diesel engine oil pipe seal gasket provided by the invention has the advantages of excellent thermal stability, good impact-resistant effect, good mechanical properties and excellent seal effect, can effectively preventoil impregnation, greatly improves the work reliability of a diesel engine oil pipe, and facilitates application and popularization.

The invention discloses a thermocouple temperature measuring circuit protection tube. The thermocouple temperature measuring circuit protection tube is prepared from the following raw materials in parts by weight: 60 to 70 parts of main material, 1 to 2 parts of 1,1-bi-(tert-butyl peroxide)cyclohexane, 2 to 6 parts of multiwalled carbon nanotube, 2 to 4 parts of weathered coal, 1 to 5 parts of carbon fiber, 4 to 10 parts of vermiculite powder, 1 to 2 parts of isostearic acid isopropyl titanate, 5 to 12 parts of bamboo fiber compound, 1.5 to 2.5 parts of plasticizer, 1 to 2 parts of antistaticagent, 0.4 to 0.6 part of compatibilizer and 1 to 2 parts of antiaging agent. The thermocouple temperature measuring circuit protection tube disclosed by the invention has high elasticity and superiormechanical performance, is not liable to crack, and has extremely high thermal stability; the thermocouple temperature measuring circuit protection tube is buffered under vibration, so that a core body in the protection tube is prevented from being damaged under severe vibration.

The invention discloses drill bit housing steel and a preparation method thereof, and relates to the technical field of rock drilling tools. The steel is prepared from the chemical components: 0.22-0.34% of C, 0.10-0.35% of Si, 0.40-0.60% of Mn, less than or equal to 0.030% of P, less than or equal to 0.030% of S, 1.10-1.40% of Cr, 0.20-0.45% of Mo and 3.90-4.30% of Ni. Chromium in the steel enhances the hardenability of the steel and has a secondary hardening effect, a drill bit housing has good corrosion resistance and oxygen resistance, and the hardness and wear resistance of high carbon steel are improved without embrittling the steel. Meanwhile, through the adoption of chromium, the high-temperature mechanical properties of the steel are improved, and the performance impact of high temperature generated in the rock drilling process on the drill bit housing is reduced. In terms of chemical components, vanadium is replaced with chromium, so that more uniform strength, toughness andfatigue strength of the drill bit housing are obtained, and better strength and wear resistance of the drill bit housing are obtained. Meanwhile, through the proportion adjustment of other metal elements, the drill bit housing is more suitable for rock drilling in limestone areas.

The invention discloses an antiageing rubber material for a housing of a traffic direction board. The antiageing rubber material contains the following raw materials in parts by weight: 50-70 parts of a polypropylene compound, 40-60 parts of chloroprene rubber, 30-50 parts of a thermoplastic polyurethane elastomer, 10-16 parts of a mica plate, 12-15 parts of zeolite powder, 10-18 parts of expanded perlite, 50-60 parts of precipitated barium sulphate, 3-4 parts of a crosslinking agent, 2-4 parts of calcium stearate, 2-4 parts of disproportionated rosin, 1.5-2.5 parts of 4-cinnamon phenol, 1-2 parts of 2,2'-methylene bis(4-methyl-6-tert butyl phenol), 7-10 parts of a plasticizer and 5-7 parts of a lubricant. The antiageing rubber material for the housing of the traffic direction board, disclosed by the invention, is extremely high in crosslinking density, extremely high in waterproof performance and good in antiageing property, and not only is high in tensile strength, but also has relatively great flexural modulus and relatively high notch impact strength.

The invention discloses a high performance aluminium alloy high voltage power cable which includes a cable core, an insulating layer, a shielding layer and a sheath layer. The insulating layer covers the outside of the cable core. The shielding layer covers the outside of the insulating layer. The sheath layer covers the outside of the shielding layer. The cable core is made of heatproof aluminium alloy leads, and the sheath is made of modified nitrile butadiene rubber. The high performance aluminium alloy high voltage power cable has excellent wear resistance and hear resistance.

The invention discloses an anti-impact polyvinyl chloride cable material easy to process. The anti-impact polyvinyl chloride cable material is prepared from, by weight, 25-35 parts of epoxy resin, 20-40 parts of polyvinyl chloride, 50-70 parts of acrylonitrile-butadiene-styrene copolymer, 15-25 parts of modified nano silica, 6-10 parts of polytetrafluoroethylene fiber, 5-10 parts of flyash, 15-23 parts of coconut fiber, 6-12 parts of levant cotton exocarp, 1.5-2.5 parts of maleic anhydride, 2-5 parts of methacrylic acid-chromic chloride complex, 2-4 parts of color master batch, 1-2 parts of fish oil and 2-4 parts of pitch. The anti-impact polyvinyl chloride cable material easy to process is high in flowability in the processing process, easy to process and extremely high in impact resistance.

The invention discloses a thin-wall lightweight meter cable for oil-gas engineering. The thin-wall lightweight meter cable comprises a cable core and a sheath layer coating the outer side of the cablecore, wherein the sheath layer is prepared from the raw materials in parts by weight: 60-80 parts of ethylene propylene terpolymer rubber, 40-50 parts of polyurethane rubber, 50-60 parts of nitrile silicone rubber, 6-10 parts of vulcanizer, 40-50 parts of vermiculite powder, 20-30 parts of precipitated barium sulfate, 60-70 parts of channel carbon black, 4-8 parts of octyl phenolic aldehyde tackifying resin, 40-50 parts of carbon fibers, 4-8 parts of propylene glycol polysebacate, 2-4 parts of modified soybean oil and 3-5 parts of anti-aging agent.

The invention relates to a copper wire online annealing apparatus for a communication cable. The apparatus comprises a cabin body and a controllable DC source system. The cabin body is internally provided with two conductive wheels which are spaced and have their end surfaces in level arrangement; the conductive wheels are connected with the cabin body through shafts; the shafts are provided with carbon brushes; the controllable DC source system comprises a three-phase adjustable rectifier; and the three-phase adjustable rectifier rectifies three-phase AC power into a DC source for adding to the two conductive wheels through the carbon brushes, and copper wires on the two conductive wheels are energized and heated, such that the annealing purpose is realized. The copper wire online annealing apparatus for the communication cable can enable a copper wire drawing process, an annealing process and a subsequent process of extruding an insulation layer by the copper wires to be continuously produced and improves the work efficiency and the product quality.

The invention discloses a good-airtightness anti-aging tire rubber material. The good-airtightness anti-aging tire rubber material is prepared from the following raw materials in parts by weight: 25 to 35 parts of nitrile butadiene rubber, 2 to 8 parts of polyurethane, 12 to 16 parts of ethylene-propylene copolymer, 5 to 12 parts of phenolic resin, 0.2 to 0.6 part of ammonium dichromate, 1 to 2 parts of dibenzothiazyl disulfide, 0.5 to 1.5 parts of oleic acid, 1 to 2 parts of stearic acid, 20 to 30 parts of modified cotton fiber, 2 to 8 parts of kaolin, 5 to 10 parts of feldspar, 40 to 50 parts of lardite, 2 to 8 parts of limestone, 1 to 5 parts of apatite, 5 to 15 parts of ceramic microspheres, 1 to 3 parts of acetyl tributyl citrate, 1 to 2 parts of polyethylene wax, 1 to 2 parts of chlorinated paraffin, 0.5 to 1.5 parts of antioxidant AT-215, 1 to 2 parts of ultraviolet absorber UV-531 and 1 to 2 parts of ultraviolet absorber TB75. The good-airtightness anti-aging tire rubber material disclosed by the invention is good in tearing resistance, excellent in sealing performance and good in aging resistance.