696 results about "High-density polyethylene" patented technology

The invention discloses a high-weatherability sound insulation wood plastic wallboard and a preparation method thereof, the high-weatherability sound insulation wood plastic wallboard comprises the following raw materials by weight: 30-40 parts of wood flour or plant fiber, 25-35 parts of a sound insulation functional filler, 35-45 parts of high density polyethylene, 2-2.5 parts of maleic anhydride grafted high density polyethylene, 1-1.5 parts of stearic acid, 3-4.5 parts of a weatherability auxiliary agent, and 1-1.5 parts of azodicarbonamide. The problems of cracking, deformation and the like caused by moisture absorption expansion are relieved by optimizing the proportion and compatibility of the wood flour and the plastic, and then the problems of weather resistance and sound insulation of the wallboard outdoors are solved by filling the porous sound absorption material.

The invention belongs to the technical field of 3PE corrosion prevention, and particularly relates to a high-temperature-resistant and cathodic disbonding-resistant 3PE corrosion-resistant pipeline and a preparation method thereof. A pipeline epoxy bottom layer, a middle adhesive layer and a polyethylene surface layer are subjected to systematic chemical synergistic modification, specifically, the epoxy bottom layer is modified with phenolic resin and amino silane, and a heat-resistant compact barrier is formed; the middle layer reacts with maleic anhydride grafted polyethylene through amino silane to construct a chemical bridge for simultaneously connecting the upper layer and the lower layer; the surface layer is grafted with high-density polyethylene through fluoroprimary amine modified glycidyl methacrylate, and a hydrophobic and oleophobic chain and a reactive functional group are introduced; according to the structure, through the synergistic effect of the high-temperature stability of the bottom layer, the two-way chemical bridging capacity of the middle layer and the inert hydrophobic characteristic of the surface layer, the long-term use temperature upper limit, the stripping resistance and the medium infiltration resistance of the pipeline are improved, and a solution is provided for long-term protection of the pipeline in the severe environment.

The invention relates to the field of films, in particular to a BOPP matt film and a preparation method thereof.The matt film comprises an upper surface layer, an upper subsurface layer, a core layer and a lower surface layer which are sequentially arranged, the upper subsurface layer and the upper surface layer with the thickness of 0.4-0.6 micrometer jointly form a matt layer with the thickness of 2 micrometers, the upper surface layer comprises polypropylene random copolymer and high-density polyethylene, and the lower surface layer comprises polypropylene random copolymer and high-density polyethylene. The upper surface layer comprises polypropylene random copolymer, high density polyethylene and 10-15 wt% of PMMA master batch, the content of monodisperse PMMA microspheres is 10 wt%, the particle size is 3.5-4.5 [mu] m, and both the core layer and the lower surface layer comprise homo-polypropylene. Through reasonable design of the particle size of the PMMA microspheres, the thickness of the upper surface layer and the thickness of the upper sub-surface layer, the PMMA microspheres protrude out of the surface of the upper surface layer to increase the surface roughness, the use amount of the high-density polyethylene in the upper surface layer is reduced, precipitation of the high-density polyethylene is reduced from the source, the production efficiency is improved, and the extinction uniformity is ensured.

The invention discloses a preparation method of a nano silicon dioxide modified high-density polyethylene wear-resistant plate, and belongs to the technical field of polyethylene plates, the method comprises the following steps: firstly preparing an antioxidant PMMA microcapsule, then preparing titanium dioxide and silicon dioxide, and modifying by KH550 to obtain modified nano titanium-silicon composite particles; then, an antioxidant coated PMMA microcapsule, the modified nano titanium-silicon composite particles, POE-g-MAH and HDPE particles are premixed, and the wear-resistant plate is obtained through twin-screw extrusion granulation and pulsating force field assisted molding; through the synergistic effect of the antioxidant coated PMMA microcapsule, the modified nano titanium-silicon composite particles and the compatilizer POE-g-MAH, the problems that the wear resistance of the HDPE plate is insufficient and the antioxidant is easily adsorbed by nano silicon dioxide to cause aging resistance attenuation are solved, and the wear resistance, thermal oxidation / light aging resistance and mechanical property improvement of the plate are realized; and the requirements of high-frequency wear scenes such as mine conveying and outdoor engineering can be met.

The invention discloses a polypropylene composite material as well as a preparation method and application thereof. The polypropylene composite material comprises the following components in parts by weight: 50-80 parts of polypropylene resin; 4-10 parts of high density polyethylene; 5-15 parts of a polyolefin elastomer; 10 to 20 parts of talcum powder; 1 to 4 parts of polypropylene grafted polysiloxane; and 0.05 to 0.3 part of a beta crystal form nucleating agent. According to the polypropylene composite material disclosed by the invention, polypropylene is grafted with high-molecular-weight polysiloxane, and a specific nucleating agent is added, so that the crystal form of polypropylene is optimized, a more uniform microstructure is formed, a large spherocrystal boundary is reduced, a more uniform dispersion environment is provided for silicone molecules, local enrichment is avoided, and the mechanical property of the polypropylene composite material is improved. Therefore, the injection molding floating problem is effectively improved, and meanwhile, the high scratch resistance of the material is guaranteed. The high-performance polypropylene composite material which has excellent scratch resistance and good appearance at the same time is realized.

The invention provides a polyethylene composite film. The polyethylene composite film comprises a surface layer, a middle layer and a heat sealing layer which are sequentially stacked, wherein the surface layer is composed of 58%-76% of hexene copolymerized metallocene linear low density polyethylene, 18%-37% of low density polyethylene and a small amount of slipping agent and anti-blocking agent; the middle layer is composed of 79%-88% of octene copolymerized metallocene medium density polyethylene, 5%-21% of hexene copolymerized metallocene linear low density polyethylene and 6%-15% of high density polyethylene; and the heat sealing layer is composed of 47%-65% of hexene copolymerized metallocene linear low density polyethylene, 33%-45% of low density polyethylene and 2%-5% of a tackifier. According to the composite film disclosed by the invention, through gradient design of each layer of material, the whole composite film has rigidity and toughness, and the composite film is particularly suitable for manufacturing stand-up bag packages which stand stably and are compression-resistant and impact-resistant.

The invention relates to the technical field of building materials, and provides high-crack-resistance concrete based on sheath temperature shrinkage-core material phase change composite fibers and a preparation method of the high-crack-resistance concrete. The composite fiber is of a core-shell structure, and a core material is formed by loading an organic or inorganic phase change material on a porous metal fiber; the material of the sheath layer comprises one or more of polyester, polypropylene, polyurethane and high-density polyethylene; and the sheath layer is thermally shrunk through thermal treatment and coats the core material. According to the concrete disclosed by the invention, by introducing the sheath temperature shrinkage-core material phase change composite fiber, not only is a temperature field actively regulated and controlled by utilizing phase change latent heat, but also beneficial pre-compressive stress is introduced into the concrete through the temperature shrinkage effect of the fiber sheath; therefore, the crack resistance of the concrete is synergistically improved from multiple dimensions of stress source control, concrete inner surface temperature difference reduction and matrix enhancement, and it is guaranteed that the mechanical property of the concrete is not remarkably reduced due to introduction of the PCM.

The invention discloses a photovoltaic cable sheath material with ultraviolet aging resistance and long service life. Comprising the following components in parts by weight: 100 to 120 parts of high-density polyethylene, 0.3 to 0.5 part of a benzotriazole ultraviolet light absorber, 0.5 to 0.8 part of a hindered amine light stabilizer, 0.2 to 0.5 part of an antioxidant, 3 to 5 parts of salicylate intercalated magnesium aluminum hydrotalcite, 0.02 to 0.05 part of cerium acetylacetonate, 2 to 4 parts of rutile type nano titanium dioxide, 3 to 5 parts of a compatilizer and 0.5 to 1 part of a dispersant. The photovoltaic cable is prepared from the anti-ultraviolet aging long-life photovoltaic cable sheath material, an insulating layer material and a conductor, so that the obtained photovoltaic cable sheath material and the photovoltaic cable have excellent anti-ultraviolet capability and thermal aging resistance, and have relatively long service life.

The invention provides an anti-impact modified high-density polyethylene anti-leakage pipeline connecting device, and relates to the technical field of pipeline connecting devices.The anti-impact modified high-density polyethylene anti-leakage pipeline connecting device comprises a connecting sleeve, the two side ends of the connecting sleeve are each provided with a positioning mechanism, and the positioning mechanisms are used for covering the ends of a polyethylene pipeline; according to the pipeline connecting sleeve, the end of the pipeline is prevented from being damaged due to collision and friction in the connecting process, meanwhile, the fitting precision of the sealing face and the outer wall of the pipeline is guaranteed, the pipeline is preliminarily guided by means of the matching relation between the clamping jaws and the groove bodies, and the coaxiality of the pipeline and the connecting sleeve is adjusted in real time; when the pipeline continues to be inserted into the second-stage positioning groove, the round-head clamping jaw is connected with the groove body in a clamped mode under the elastic effect of the metal elastic piece, at the moment, the second-stage positioning groove can effectively buffer the insertion impact force borne by the clamping jaw, the stress load of the metal elastic piece is dispersed, and the sealing effect of the pipeline is improved. And the elastic sheet is prevented from overload deformation and loss of elastic reset capability due to overexertion in one-time insertion.

The invention discloses a high-strength antistatic composite film and a preparation method thereof, and belongs to the technical field of high polymer materials. The antistatic composite film comprises the following components in parts by weight: 80-100 parts of high-density polyethylene, 10-25 parts of a composite antistatic agent, 1-2.5 parts of a lubricant, 3-5 parts of polypropylene grafted maleic anhydride and 0.1-1 part of an antioxidant. According to the invention, the high-density polyethylene is used as a matrix, the composite antistatic agent is added through blending, and an external coating mode is not adopted, so that the antistatic composite film is prepared; the prepared composite film has a long-term antistatic effect, the surface performance of the composite film can be remarkably improved, the comprehensive mechanical property and processing adaptability of the film can be guaranteed, and the composite film is suitable for various packaging scenes with high requirements for the surface performance.

The invention relates to the technical field of cables, and provides a fireproof flame-retardant cable and a preparation method thereof. The fireproof flame-retardant cable comprises a conductor, an insulating layer and a sheath layer which are sequentially arranged from inside to outside, and the sheath layer is prepared from, by weight, 40-50 parts of high-density polyethylene, 30-40 parts of ethylene-vinyl acetate copolymer, 30-40 parts of flame retardant, 15-20 parts of filler, 8-10 parts of plasticizer, 2-4 parts of lubricant, 2-4 parts of antioxidant, 2-3 parts of stabilizer and 2-3 parts of cross-linking agent; the flame retardant is prepared from the following component raw materials in parts by weight: 30 to 40 parts of magnesium hydroxide, 10 to 15 parts of aluminum hydroxide, 4 to 5 parts of zinc borate, 3 to 4 parts of diethyl phosphoryl ethyl triethoxy silane and 1 to 1.5 parts of 2-(2-pyridyl) ethyl trimethoxy silane. According to the technical scheme, the problem of insufficient fireproof and flame-retardant performance of the cable in the prior art is solved.

The invention provides a solid waste landfill positioning leakage detection device, which takes a matrix type detection network and an acquisition host as a core framework, detection units made of graphene or titanium alloy form a detection unit group according to a membrane upper-membrane lower-membrane corresponding principle, and a matrix distributed electrode pair structure is formed between a solid waste landfill area and a foundation area. The acquisition host applies excitation voltage to the detection unit groups, receives current signals, judges whether leakage occurs or not based on resistance parameters, and determines leakage positions through a three-point positioning principle (the detection unit groups with abnormal resistance parameters are used as vertexes of a right triangle, and leakage point coordinates are calculated in combination with preset Dx and Dy distance parameters and Ra, Rb, Rc and Rd resistance proportions); meanwhile, an anti-corrosion insulating layer (high-density polyethylene) is used for protecting the detection unit, a storage module is used for recording historical data, a communication module is in butt joint with an upper computer, and an alarm module is used for prompting the leakage position in real time, so that a complete leakage detection system is constructed.

The invention discloses a wear-resistant and corrosion-resistant modified polyethylene special pipe and a preparation method thereof, and relates to the technical field of high polymer materials. The high-density polyethylene composite material is prepared from the following raw materials in parts by mass: 360 to 440 parts of high-density polyethylene, 100 to 120 parts of an ethylene-1-octylene copolymer, 15 to 20 parts of modified nanotubes, 20 to 25 parts of a composite flame retardant, 8 to 10 parts of a cold-resistant toughening agent, 0.2 to 0.4 part of an antioxidant 1010 and 0.2 to 0.4 part of an antioxidant 168. The modified nanotube is prepared by the following steps: pretreating a multi-walled carbon nanotube with a nitric acid aqueous solution, compounding the pretreated multi-walled carbon nanotube with tetrabutyl titanate and aluminum nitrate nonahydrate, heating to 800 DEG C in a nitrogen atmosphere, treating the multi-walled carbon nanotube with a mixed gas of methane, nitrogen and ammonia gas for 2-3 hours at 800 DEG C, and finally cooling the multi-walled carbon nanotube in the nitrogen atmosphere. And due to the introduction of the composite flame retardant and the like, the impact resistance, wear resistance, flame retardance and corrosion resistance of the polyethylene pipe are effectively improved.

The invention belongs to the technical field of medical materials, and particularly relates to an oral liquid film-covered rubber plug and a preparation method thereof.The oral liquid film-covered rubber plug is characterized in that vulcanized halogenated butyl rubber serves as a base material piece, a functional film is bonded to the surface of the base material piece through a hot-pressing composite technology, and the functional film is prepared by taking ethylene-vinyl acetate copolymer with the VA mass ratio being 28-33% as a base material layer; an ethylene-vinyl acetate copolymer with the mass ratio of VA being 18-22% is used as a transition layer, and polytetrafluoroethylene or high-density polyethylene is used as a functional layer. The novel laminated rubber plug with excellent sealing performance, chemical stability and sterilization compatibility is prepared by utilizing a gradient composite structure and a multi-step process optimization technology, and the laminated rubber plug is simple in preparation method, easy to process and form and wide in application prospect.

The utility model relates to a combined artificial fish reef with a light structure, which is formed by assembling a plurality of functional parts made of HDPE (high-density polyethylene) materials on a steel structure frame, and the HDPE materials have the advantages of high hardness, aging resistance, decomposition resistance, no toxicity, no odor and light weight. The light weight of the reef body can be guaranteed, and deposition is prevented; meanwhile, the plasticity of the material is higher, a more complex space structure can be achieved, more living space is provided for benthic organisms, development of bottom sowing proliferation is facilitated, and economical efficiency and applicability are high.

The application belongs to the technical field of waterproofing of building engineering, and provides a high-strength puncture-resistant railway tunnel waterproofing and draining plate and a preparation method thereof, according to mass percentages, raw materials include: 30-35 wt% polyolefin elastomer POE, 40-45 wt% high-density polyethylene, 20-30 wt% antioxidant reinforcing master batch; the antioxidant reinforcing master batch includes, by weight parts: 6-8 parts of nano-SiO2, 20-28 parts of EPDM-g-MS, 60-70 parts of linear low-density polyethylene, 1-3 parts of antioxidant, and 1-3 parts of ultraviolet resistance agent. The railway tunnel waterproofing and draining plate provided by the application not only satisfies all the performances specified in Q / CR562.3-2018, but also has more excellent tensile properties and puncture resistance.

Hoses include inner tube, a reinforcement layer disposed outwardly from the inner tube, and a cover layer disposed outwardly from the reinforcement layer, and the cover layer and / or inner tube is based on a cured composition formed from a mixture containing a blend of chlorinated polyethylene (CPE) and cross-linkable oxidized high density polyethylene (oxidized HDPE), where the CPE and oxidized HDPE are blended in a CPE:oxidized HDPE weight ratio of from 10:1 to 1:1, and a peroxide curing system. The peroxide curing system used in some compositions according the disclosure include alpha-alpha-bis(t-butylperoxy)diisopropylbenzene and trimethylolpropane trimethacrylate.

The invention discloses a heat insulation and heat preservation composite pipe forming device, and relates to the technical field of pipeline forming. The heat insulation and heat preservation composite pipe forming device comprises an inner pipe extrusion die, a heat preservation layer extrusion die, a blind hole forming mechanism and an outer skin extrusion die which are sequentially arranged. The inner pipe extrusion die is used for extruding an inner pipe, the heat preservation layer extrusion die is used for extruding a heat preservation layer and wrapping the outer surface of the inner pipe, the blind hole forming mechanism is used for punching an inner wall filling blind hole in the heat preservation layer when the heat preservation layer is not shaped, and the outer skin extrusion die is used for extruding an outer skin layer, wrapping the outer surface of the inner pipe and filling the filling blind hole. According to the heat insulation and heat preservation composite pipe forming device, due to the fact that the blind hole forming mechanism is arranged, the formed heat insulation and heat preservation composite pipe can form the filling blind hole in the heat preservation layer, the filling blind hole is filled with high-density polyethylene, and therefore the situation that an outer skin and the heat preservation layer are separated from each other due to the fact that the thermal expansion rates of the outer skin and the heat preservation layer are different is avoided.

The application belongs to the technical field of inner lining oil pipe and particularly relates to an inner lining oil pipe and a preparation method thereof. The inner lining oil pipe is prepared from the following raw materials in parts by mass: 70-90 parts of ultra-high molecular weight polyethylene, 8-13 parts of high-density polyethylene, 7-12 parts of modified carbon nanotube, 2-5 parts of reinforcing filler, 3-6 parts of compatilizer, 0.1-0.3 parts of calcium-zinc composite stabilizer and 0.05-0.2 parts of lubricant. The inner lining oil pipe prepared by the application has excellent tensile strength, toughness, chemical stability and other performances.

The invention relates to the technical field of high polymer materials, in particular to a polyethylene flame-retardant master batch and a production process thereof. The polyethylene flame-retardant master batch is prepared from the following raw materials in parts by weight: 50 to 60 parts of polyethylene, 10 to 20 parts of hydroxymethyl phosphinic acid, 15 to 20 parts of HDPE-g-MAH, 0.8 to 1.5 parts of an initiator, 1 to 2 parts of an antioxidant and 3 to 6 parts of functional particles. The polyethylene is selected from high-density polyethylene, and the melt index of the polyethylene is 7-20g / 10min under the conditions of 190 DEG C and 2.16 kg; the polyethylene flame-retardant master batch produced by the invention not only can effectively enhance the flame retardant property of a polyethylene product, but also can effectively improve the anti-aging property of the polyethylene product; and the service life of the polyethylene product is prolonged to a certain extent while the quality of the polyethylene product is ensured.

The present application relates to the technical field of discontinuous reinforced short fibers, in particular to a high-performance composite short fiber and a preparation method thereof.The present application overcomes the contradiction between the hygroscopicity and mechanical properties of the composite short fiber and the problem of poor skin-core interface compatibility.By reacting acidified carbon nanotubes with hydroxyl-terminated hyperbranched polyester, and then melt extruding with PET chips, a high-strength core layer master batch is obtained;high-density polyethylene, a hydrophilic agent, hydrophilic modified MOF particles and E-GMA copolymer are mixed and extruded to obtain a skin layer PE master batch with long-term hydrophilicity;the skin and core layer master batches are spun into a skin-core structure, and after ring blowing cooling, two-bath drafting, heat setting, mechanical crimping and cutting, a composite fiber is obtained.The prepared PE / PET bicomponent composite short fiber not only has excellent tensile strength, but also has persistent and stable moisture absorption and sweat releasing functions.

The invention relates to the field of high polymer materials, and discloses a high-density polyethylene composition, a high-density polyethylene material and a preparation method and application thereof. The high-density polyethylene composition contains high-density polyethylene, polyethylene wax, an acid acceptor, a slipping agent and an antioxidant; on the basis of the total weight of the high-density polyethylene composition, the content of the high-density polyethylene is 95 to 99.5 wt%, the content of the polyethylene wax is 0.1 to 4 wt%, the content of the acid acceptor is 0.05 to 0.3 wt%, the content of the slipping agent is 0.05 to 0.5 wt%, and the content of the antioxidant is 0.05 to 0.3 wt%. The high-density polyethylene material prepared from the high-density polyethylene composition has the advantages of low machine head pressure, small pressure change and stable pressure rise curve, and the screen exchange period can reach more than 30 days.

The invention relates to a neutron measuring device (1). The device (1) comprises a housing (90), a high-density polyethylene block (10) in the housing (90), a shell made of neutron-absorbing material (20) integrated into the block (10), a first scintillation neutron detector (30) located inside the shell (20) and capable of emitting a signal proportional to the number of neutrons detected per unit of time, and a module (40) capable of converting the signal into a neutron count rate.

The utility model relates to the technical field of liquid storage tanks, in particular to an integrated high-density polyethylene container for containing pressure-resistant cold and hot water, which comprises a tank body. A plurality of pipe orifices are formed in the side surface of the tank body; a boss is arranged at one end of the tank body; the boss is provided with an opening; a nut is embedded in the boss; the tank body, the pipe opening and the nut are integrally formed through extrusion blow molding. The tank body, the nut and the pipe orifice are integrally formed, so that an electric heating rod can be conveniently mounted subsequently; during use, a metal water pipe insert does not need to be additionally arranged, so that the whole sealing is safe and reliable; by arranging the annular clamping ring, the strength of the tank body is enhanced, and a mounting structure is provided; the tank body, the pipe orifice and the nut are integrally formed through extrusion blow molding, so that the whole body has the characteristics of high efficiency, simple process, low cost, easiness in recovery and easiness in regeneration; in the aspects of inlet and outlet pipelines, mounting positions and size series, the currently used metal liner can be directly replaced without any process change or accessory increase and decrease according to the specification of the current metal liner.

The present invention relates to a multilayer film comprising: an inner layer system comprising a first surface and a second surface; a first skin layer adhered to the inner layer system at the first surface of the inner layer system; and a second skin layer adhered to the inner layer system at the second surface of the inner layer system; wherein the inner layer system consists of a polymer formulation (A), wherein the polymer formulation (A) comprises: > 60.0 and < 90.0 wt% of a first ethylene-based polymer which is a linear low density polyethylene A (LLDPE A); and > 10.0 and < 40.0 wt% of a high density polyethylene (HDPE) having a density > 940 and < 970 kg / m 3 , preferably > 955 and < 970 kg / m 3 ; measured according to ASTM D792 (2008); and the first and / or second skin layer is a sealing layer comprising a second ethylene-based polymer which is a linear low density polyethylene B (LLDPE B) comprising polymerized moieties derived from ethylene and 1-octene or 1-hexene having a density > 890 and < 915 kg / m 3 , preferably > 900 and < 915 kg / m 3 , measured according to ASTM D792 (2008); preferably, wherein the sealing layer comprises > 70.0 wt% of the second ethylene-based polymer, or wherein the sealing layer consists of the second ethylene-based polymer; wherein the multilayer film is a biaxially oriented film, wherein the biaxial orientation is introduced in solid state. This film allows the production of a sealed package having a sufficiently high seal strength at reduced sealing temperature (also referred to as seal initiation temperature) which at the same time has improved tensile properties, such as an improved tensile modulus in machine and transverse direction and an improved tensile strength in machine and transverse direction, which has proven.

The application relates to the field of shoe-making moulds and high polymer foaming forming technology, and discloses a running type basketball shoe tree and a production process thereof. The shoe tree is made of raw materials containing the following components by weight: high-density polyethylene, ethylene-1-octene copolymer, precipitated barium sulfate, dicumyl peroxide, divinylbenzene and powder pre-dispersed foaming agent. The production process of the shoe tree comprises the following steps: constant temperature closed mixing, melt extrusion and air cooling and granulation of all the materials to obtain base rubber particles, injection of the rubber particles into a mould after heating to complete chemical crosslinking and microporous foaming, superposition of a sinusoidal servo pressure maintaining flow field on the material to implement mechanical kneading of the material to promote molecular chain segment relaxation and rearrangement when the temperature is lowered to the semi-cured window period, and finally forced cooling and shaping in a tree to obtain the shoe tree. Through polymer blending and heterogeneous nucleation, and in combination with the sinusoidal servo flow field mechanical kneading to eliminate residual stress, the size precision and mechanical support consistency of the shoe tree are improved.

The invention relates to the field of plastic products and preparation, and particularly discloses a breathable stretch-resistant flat pocket and a preparation method thereof. The breathable stretch-resistant flat bag comprises a high-density polyethylene-polypropylene composite film, a nanofiber net and linear low-density polyethylene which are sequentially compounded, wherein the nanofiber net is a PET nanofiber net; in addition, the preparation method has the advantages that the tensile property of the pocket is improved, and the air permeability of the pocket is not affected.

The application discloses a kind of corrosion-resistant double-armored submarine cable and preparation method thereof, it is related to submarine cable technical field.The corrosion-resistant double-armored submarine cable includes outer sheath layer, water barrier layer, double-armored layer, insulating inner liner, filling layer, insulating layer, copper conductor in turn from surface to inside;The outer sheath layer is obtained by extruding coating on the surface of double-armored layer by corrosion-resistant submarine cable material;The corrosion-resistant submarine cable material includes the following raw material components: by mass parts, 75-90 parts of high-density polyethylene, 30-50 parts of ultra-high molecular weight polyethylene, 10-25 parts of modified microfiber, 8-15 parts of ethylene-vinyl acetate copolymer, 0.2-0.5 parts of antioxidant, 1-1.2 parts of lubricant.The application optimizes sheath layer material, solves the problems of existing double-armored submarine cable corrosion failure, short service life, unstable performance and other problems, meets the demand of long-term service reliability.

To provide a fiber-reinforced resin composition excellent in tensile modulus, tensile strength and impact strength without using a glass fiber, an organic filler and a high-density polyethylene.SOLUTION: The fiber-reinforced resin composition contains polypropylene as a base resin and cellulose fibers as reinforcing fibers. The fiber-reinforced resin composition contains an acid-modified elastomer and a maleic anhydride-modified polypropylene.SELECTED DRAWING: Figure 1