2804 results about "Aramid" patented technology

The invention provides a low-voltage cable, and relates to the technical field of cables, the low-voltage cable comprises a conductor layer, a support layer, a shielding layer and a sheath layer, the conductor layer is composed of multiple strands of fractal stranded conductors, and each fractal stranded conductor comprises an inner-layer superfine silver-plated copper wire, a middle-layer copper-clad aluminum wire and an outer-layer nickel-plated copper alloy wire; the supporting layer wraps the conductor layer and comprises an inner supporting layer, a dynamic framework layer and an outer restraint layer, the inner supporting layer is an obliquely wound aramid fiber woven belt, the dynamic framework layer is formed by alternately arranging shape memory polymers and carbon fiber composite belts, and the outer restraint layer is a spirally wound silica gel-glass fiber composite rope. The shielding layer comprises a tinned copper wire woven mesh; the sheath layer is a thermoplastic polyurethane matrix, a microcapsule self-repairing agent is dispersed in the thermoplastic polyurethane matrix, a microcapsule comprises a siloxane prepolymer, and the thermoplastic polyurethane matrix further comprises graphene nanosheets. Through collaborative design of the fractal stranded conductor layer, the dynamic skeleton support layer, the shielding layer and the self-repairing sheath, comprehensive improvement of cable performance is realized.

The invention belongs to the technical field of gel materials, and particularly relates to aerogel powder for polyolefin modification and a preparation method and application thereof. The preparation method of the aerogel powder comprises the following steps: (1) preparing aramid nanofiber dispersion liquid; (2) preparing a polypyrrole coated aramid nanofiber dispersion liquid; (3) mixing polyamide acid and the polypyrrole coated aramid nanofiber dispersion liquid, and then carrying out partial imidization and solvent exchange to prepare hydrogel; and (4) carrying out freeze drying, thermal imidization and crushing to obtain the aerogel powder for polyolefin modification. The aerogel powder is a porous solid material formed by forming one-dimensional composite fibers from aramid nanofibers and polypyrrole and combining the one-dimensional composite fibers with polyimide resin. The aerogel powder and polyolefin resin are compounded to obtain the polyolefin resin composite material with high strength and antistatic property, and the polyolefin resin composite material can be widely applied to the fields of pipes, plates, grouting equipment parts, grouting bags and the like.

The invention belongs to the technical field of fiber materials, and particularly relates to a modified aramid nanofiber as well as a preparation method and application thereof. The preparation method comprises the following steps: (1) preparing an aramid nanofiber dispersion liquid; (2) modifying the aramid nanofiber by using POSS; and (3) carrying out in-situ polymerization on polypyrrole on the surface of the aramid nanofiber. POSS (polyhedral oligomeric silsesquioxane) has a relatively large volume exclusion effect, the template effect of long-chain alkyl quaternary ammonium salt can be influenced by scattered adhesion of POSS on the surface of aramid nanofiber, uneven polymerization of pyrrole monomers is caused, and formation of a rough structure on the surface of the fiber is facilitated. According to the invention, the polypyrrole-coated aramid nanofiber with a coarse structure is used as a polyolefin modified material, so that the problem of low interfacial force existing in a common filler is solved, and the polyolefin resin composite material with high strength and antistatic property is obtained and can be widely applied to the fields of pipes, plates, grouting equipment parts, grouting bags and the like.

The invention provides a high-strength, light and supercritical foaming fabric and a preparation method thereof, complete fibers used by the fabric comprise core layer fibers and a skin layer material, the outer side of the core layer fibers is uniformly coated with the skin layer material, and the skin layer material can be foamed; the core layer fiber is at least one of aramid fiber, polyarylate fiber, polyimide fiber, ultra-high molecular weight polyethylene fiber, polyester fiber and polyamide fiber; and the skin layer is made of thermoplastic elastomer resin. The preparation method comprises the following steps: uniformly coating the outer side of the core layer fiber with the skin layer material, and then carrying out supercritical foaming on the skin layer material. According to the invention, the contradictory technical requirements of the fabric for shoes on strength, light weight, comfort and the like are solved in a simple mode; the body strength of the fiber for the shoes can be kept, and the characteristics of light weight and air permeability of the foaming fabric are also achieved; the difficulty of direct foaming of the fabric / fiber for shoes is reduced, and the vamp fabric and the shoe article which are uniform in foaming, breathable, light in weight, high in strength and soft can be obtained.

The invention relates to the technical field of friction materials, and particularly discloses an electromagnetic brake friction material prepared from granules and a preparation process of the electromagnetic brake friction material in order to solve the problem that an existing electromagnetic brake friction plate is difficult to prepare or insufficient in performance. The reinforcing material comprises plasma modified aramid pulp, coupling modified composite mineral fibers, SiO2 coated tetrapod-like zinc oxide whiskers and carbon fiber-aluminum silicon whiskers; the filler comprises modified needle-like wollastonite and organic modified precipitated barium sulfate; the adhesive comprises boron-silicon synergistic modified phenolic resin and modified carboxy nitrile rubber. The raw materials are improved, and granules are prepared by adopting a mixing and crushing process, so that the content of an adhesive can be greatly reduced, meanwhile, the die filling efficiency can be improved, the die thickness and the high-temperature heat fading of the friction material can be reduced, a cold press molding process can be omitted, and the qualification rate of finished friction materials can be improved.

The invention belongs to the technical field of personal protection equipment, and particularly relates to a lightweight cut-resistant four-dimensional structure fabric based on high-performance composite fibers and a preparation method of the lightweight cut-resistant four-dimensional structure fabric. The structure is based on a high-performance composite fiber material and a nano silicon carbide embedding technology of high-performance polyethylene fibers, the hardness bottleneck of a single material is broken through, and multi-fiber compatibility is improved through cooperation of polyurethane fiber surface activation and polyurethane fiber anti-melting modification. The gradient twist core sheath yarn is a high-performance composite yarn, and the strength and the flexibility are balanced. In the aspect of the oversleeve fabric structure, a three-dimensional protection system comprising a honeycomb structure, a silica gel liner and a skin-friendly inner layer is adopted, so that the integration of multiple functions of hydrophobicity, fusion resistance and buffering of a light-weight cut-resistant material is realized. Under the EN 388 standard, 5-level cutting prevention can be achieved, a single high-performance polyethylene fiber cutting prevention oversleeve can only reach 3-4 levels, the weight of the composite fiber material is reduced by 40% compared with that of a full aramid fiber oversleeve, the thickness is reduced by 25%, and the composite fiber material can be suitable for complex scenes such as petroleum and electric power.

The invention relates to the technical field of cables, and discloses an anti-torsional fatigue and corrosion-resistant wind power cable and a manufacturing process thereof, the anti-torsional fatigue and corrosion-resistant wind power cable comprises a three-phase cable core main body, a dynamic compensation anti-torsion layer, a multifunctional corrosion-resistant barrier layer and an outer sheath, the three-phase cable core main body comprises a stranded conductor, a filling inner layer and an insulating layer; the dynamic compensation anti-torsion layer comprises an incongruous spiral supporting layer and a shape memory alloy compensation layer, and the incongruous spiral supporting layer comprises aramid fiber bundles and a nickel-cobalt alloy wire woven mesh; the multifunctional anti-corrosion barrier layer is arranged on the outer side of the dynamic compensation anti-torsion layer and sequentially comprises an anti-corrosion barrier bottom layer, an anti-corrosion barrier middle layer and an anti-corrosion barrier bottom layer surface layer from inside to outside. Through the gradient composite structure design, the problem of failure of a traditional wind power cable under long-term dynamic load and severe environment is effectively solved, and the torsional fatigue resistance, the corrosion resistance and the environmental adaptability are remarkably improved.

The invention discloses a sacrificial layer prepreg for a composite material and a preparation method of the sacrificial layer prepreg, and belongs to the field of composite material forming. The preparation method comprises the following steps: mixing an inorganic filler with resin, and performing film forming treatment to obtain a resin adhesive film; coating the resin adhesive film on the surface of a fiber to obtain a sacrificial layer prepreg; after the sacrificial layer prepreg is prepared, the sacrificial layer prepreg, the wave-absorbing prepreg and the structural prepreg are sequentially laid on the surface of a tool according to the tool thickening requirement, co-curing treatment and demolding treatment are carried out according to the curing process of the structural prepreg, and the composite material with the surface coated with the sacrificial layer prepreg is prepared. According to the sacrificial layer prepreg for the composite material, the aramid fiber with excellent flexibility is adopted as a carrier, direct manual stripping can be achieved, the actual laying layer number can be adjusted according to the tool thickness requirement, and compared with a traditional numerical control cutting method, the stripping efficiency is higher, and thickness control is more accurate.

The invention relates to the technical field of aromatic polyamide high polymers, in particular to a modified poly-p-phenylene terephthamide fiber with high elongation at break and a preparation method of the modified poly-p-phenylene terephthamide fiber. According to the invention, a small amount of 3, 4-difluorobenzene is introduced According to the preparation method, the third monomer containing 4, 4 '-diaminodiphenyl ether and the fourth monomer containing a diaminophenoxy functional group are added, and the molar ratio of the third monomer and the fourth monomer in the total amount of the diamine monomer is controlled, so that the rigid molecular chain structure of the conventional para-aramid fiber is destroyed to a certain extent, the breaking strength of the fiber is maintained, the elongation at break of the polymer fiber is enhanced, and the service life of the polymer fiber is prolonged. The prepared modified poly-p-phenylene terephthamide can still adopt a dry-jet wet spinning process, the cost of a new production line of a factory is saved, the fiber with stable elongation at break index is obtained by optimizing process conditions and parameters, and the elongation at break of the prepared fiber is 3.6% or above.

The invention discloses a high-strength corrosion-resistant aramid composite material and a preparation process thereof, and relates to the technical field of aramid composite materials, the high-strength corrosion-resistant aramid composite material comprises the following components by mass: 60-80 parts of ethylene propylene diene monomer, 20-40 parts of hydrogenated nitrile rubber, 10-15 parts of polytetrafluoroethylene, 18-30 parts of a filler, 10-15 parts of aramid fiber, 5-8 parts of a plasticizer, and 3-6 parts of a vulcanizing agent. The EPDM rubber, the hydrogenated nitrile rubber and the polytetrafluoroethylene are compounded, and the aramid fibers and the filler are added, so that the composite material with good mechanical property and corrosion resistance is obtained; by modifying the ethylene propylene diene monomer and the aramid fiber, the compatibility among the materials is improved, and the comprehensive performance of the composite material is further improved.

The invention discloses an aramid fiber coated polyolefin battery diaphragm and a preparation method and application thereof, the aramid fiber coated polyolefin battery diaphragm can be used for manufacturing a lithium ion battery, and the aramid fiber coated polyolefin battery diaphragm is prepared by the following method: (1) treating a polyolefin base membrane by using a strong oxidant to obtain a modified base membrane; (2) dissolving aramid resin in a solvent to obtain an aramid coating solution; and (3) coating the surface of the modified base membrane with the aramid fiber coating liquid, and then curing. According to the invention, the interface bonding strength of the base membrane and the aramid fiber coating is obviously enhanced, so that the aramid fiber coating can give full play to high heat resistance, on the basis of ensuring the tensile strength of the diaphragm, the overall thermal shrinkage rate of the diaphragm is reduced, the risk of high-temperature short circuit is effectively inhibited, and the composite diaphragm with high porosity, strong mechanical property, high uniformity and no surface defect is formed; the method is suitable for high-energy-density lithium ion batteries, and the safety and high-temperature working condition stability of the batteries are remarkably improved.

The invention relates to the technical field of medical supplies, and discloses an anti-puncture medical packaging film and a preparation method thereof. Comprising the following raw materials in parts by weight: an ethylene copolymer, modified aramid fibers, a reinforcing agent, an auxiliary agent, an antioxidant and an antistatic agent. The preparation method of the anti-puncture medical packaging film comprises the following steps: raw material blending, tape casting, film blank drying, stretching and shaping, and rolling. According to the technology, the modified aramid fibers are fully dispersed in the packaging film with the ethylene copolymer as the matrix, so that the puncture resistance of the packaging film is greatly improved, sharp objects are effectively prevented from penetrating through the packaging film, medical products are better protected, the damage risk of the products in the transportation and storage process is reduced, meanwhile, through modification, the service life of the packaging film is prolonged, and the service life of the packaging film is prolonged. The antibacterial performance is improved, and the medical material is more suitable for protection application of medical equipment.

The invention relates to the technical field of knitted fabrics, in particular to a high-strength wear-resistant anti-snagging functional dry knitted fabric for exercise training and a production process thereof, and the production process comprises the following steps: weighing the following raw materials in parts by weight: 30-40 parts of polyester fibers, 20-30 parts of aramid fibers, 5-10 parts of jade fibers and 5-10 parts of polyamide fibers; polyester fibers, aramid fibers, jade fibers and polyamide fibers are subjected to relaxation treatment and then subjected to a drawing procedure, and the mixed roving is obtained. According to the knitted fabric for exercise training, polyester fibers, aramid fibers, jade fibers and polyamide fibers are blended and blended to prepare mixed roving, meanwhile, the mixed roving is infiltrated and improved through infiltrating liquid, finally, the mixed roving is matched with modified polyester filaments to be subjected to circular knitting improvement, and the obtained knitted fabric has the advantages of being excellent in wear resistance, mechanical strength performance and snagging performance, good in elasticity and good in elasticity. And the knitted fabric has remarkable moisture absorption, dryness and dryness and washing resistance, and the comprehensive coordination of the product is excellent.

The invention discloses an ultralight high-impact-resistance photovoltaic module based on a 3D reticular reinforced structure and a preparation method thereof. The problem of contradiction between light weight and impact resistance of a traditional module is solved through a three-layer collaborative innovative design. According to the gradient enhanced front plate of the photovoltaic module, the PC layers and the ETFE layers are alternately laminated, and the 3D spiral gradient glass fiber net is embedded in the gradient enhanced front plate, so that the gradient dispersion of impact stress is realized, and the impact resistance of the edge is improved; the aramid fiber reinforced adhesive film layer wraps the battery piece, absorbs impact energy and inhibits crack propagation; the bionic honeycomb backboard is composed of a Nomex honeycomb core and a carbon fiber surface layer, and unloading is achieved through a honeycomb structure. Compared with an existing photovoltaic module, the ultralight high-impact-resistance photovoltaic module has higher light transmittance and more excellent impact resistance, the hygrothermal aging light transmittance is only reduced by 0.23%, and the ultralight high-impact-resistance photovoltaic module has ultrahigh impact resistance under the ultralight condition that the surface density is smaller than or equal to 4 kg / m.

The invention relates to the technical field of reverse osmosis membrane supports, in particular to a polyester non-woven fabric and a preparation method and application thereof.The preparation method comprises the steps that S1, polyester main body fibers and polyester adhesive fibers are used as raw materials to prepare high-quantitation original cloth M0 and low-quantitation original cloth H0; carrying out hot pressing pretreatment on the H0 to obtain a product H0 '; s2, overlapping and hot-pressing M0 and H0 'to obtain a composite non-woven fabric M1H1; s3, the M1H1 is impregnated with a functional solution, and the functional solution contains para-aramid nanofibers and nano calcium carbonate modified by hexadecyl trimethyl ammonium bromide; and then carrying out cold pressing on the composite non-woven fabric impregnated with the functional solution to obtain the nano-material modified composite non-woven fabric. And S4, carrying out secondary hot pressing treatment to obtain the polyester non-woven fabric. The polyester non-woven fabric can effectively avoid the problems of excessive curling, excessive permeation of a polysulfone solution and the like during curing after being coated with polysulfone, and is more beneficial to application in a reverse osmosis membrane.

The invention provides a core material for a vacuum insulation panel, the vacuum insulation panel and a preparation method and application of the vacuum insulation panel. The core material for the vacuum insulation panel comprises aramid fibers and a binding material, and the aramid fibers comprise at least one of poly (m-phenylene isophthalamide) fibers, poly (p-phenylene terephthalamide) fibers and heterocyclic aramid fibers; the length of the aramid fiber ranges from 1 mm to 10 mm. The vacuum insulation panel comprises a core material for the vacuum insulation panel and a barrier film material, and the barrier film material wraps the core material for the vacuum insulation panel. In the process of preparing the vacuum insulated panel and the process of cutting and producing the core material for the vacuum insulated panel, dust and fine fibers are not generated, and environmental pollution and health risks are avoided.

The invention discloses a fireproof cloak with an aerogel composite multi-layer structure, and belongs to the technical field of fireproof cloaks. Comprising an outer layer, a middle layer and an inner layer, wherein the outer layer is made of carbon fiber cloth; the middle layer is made of modified aerogel; and the inner layer is made of breathable flame-retardant cloth. According to the prepared cloak, the outer layer is the carbon fiber cloth, the carbon fiber structure is stable, middle-layer aerogel can be protected, external mechanical damage can be borne, the mass is light, and the wearing burden is reduced; the middle layer of the prepared cloak is the modified aerogel, so that the cloak is endowed with excellent heat insulation property and fire resistance; the inner layer of the prepared cloak is the aramid staple fiber needle-punched cloth, so that the cloak has the fireproof performance and also has certain wearing comfort; in conclusion, through the three-layer composite design of the carbon fiber outer layer, the modified aerogel middle layer and the aramid fiber inner layer, the composite material has the advantages of being ultra-light, high in fireproof performance and high in comfort and has important application value in the technical field of fireproof cloaks.

The present invention relates to the technical field of aromatic polyamide fiber spinning aids, and specifically relates to a light aging resistant sizing agent for aramid fibers, an anti-ultraviolet aramid fiber and a preparation method thereof. The light aging resistant sizing agent includes a spinning sizing agent, an anti-ultraviolet aging agent and a coupling agent; the anti-ultraviolet aging agent includes inorganic nanoparticles and organic ultraviolet stabilizers. The preparation method of the anti-ultraviolet aramid fiber is as follows: perform an oiling operation on the para-aramid fiber, and then perform heating to achieve thermal crosslinking to obtain the anti-ultraviolet aramid fiber. By adding inorganic nanoparticles and organic ultraviolet stabilizers to the spinning sizing agent and fixing them on the fiber surface through a thermal crosslinking reaction, the present invention forms an anti-ultraviolet aging protection layer that can exert an ultraviolet protection effect, which can well solve the problems of poor anti-ultraviolet performance of para-aramid fibers and accelerated oxidation and degradation of polymer chains under ultraviolet light, and can also meet the requirements for fiber properties such as stretching and wear resistance in subsequent processes.

A neck guard configured to protect a wearer's neck and throat from injury is provided. It comprises a continuous, slash-resistant tube defining inside and outside surfaces, and spaced apart top and bottom edges. The tube is sized to fit over the wearer's head for positioning around the neck, and the top edge is contoured to follow the shape of the wearer's jaw and skull. A plurality of means for securing the tube along both the top and bottom edges to other devices are provided as well to prevent the tube from drooping or otherwise moving out of place while being worn. The tube may be made from a seamless, knitted material using high-strength textile fibers such as aramid, para-aramid, polyethylene, ultra-high-molecular-weight polyethylene, or nylon, and it may also be blended with other rugged yet elastic materials. The neck guard can include foam padding attached to the tube for additional protection.

The invention discloses a preparation method of tread rubber, and belongs to the field of rubber processing. The preparation method comprises the following steps: pretreating aramid pulp, a coupling agent and a lubricant, and then adding the pretreated aramid pulp, the coupling agent and the lubricant into natural rubber to prepare aramid pulp master batch particles; the obtained aramid pulp master batch particles are added into raw materials for preparing tread rubber, and the prepared rubber material has excellent mechanical properties, wear resistance and low rolling resistance. According to the method, the dispersity and interface combination of the aramid pulp in the rubber are remarkably optimized, the comprehensive improvement of the mechanical property, the wear resistance and the rolling resistance of the tread rubber is realized, and the tread rubber has outstanding industrial application value.

A non-woven battery separator and processes for forming the non-woven battery separator includes a fiber blend including cellulose fibers, microfibrillated fibers, and optionally polyester and / or aramid fibers. Also disclosed are batteries including the non-woven battery separator. During fabrication, the non-woven battery separator can be effectively dried at temperatures between 120°C and 180°C, which results in the fibers absorbing water when in use. Some battery electrolytes such as lithium hexafluorophosphate react with water to form hydrogen fluoride (HF), which can be corrosive and shorten battery lifecycles and affect performance. Absorbing water from the electrolyte increases the battery life cycle by reducing HF generation.

The present invention belongs to the technical field of composite material processing, and relates to a hole making tool for aramid fiber-reinforced plastic and a design method thereof. The drill bit has a step reversed point angle structure, which can reduce a trust force during drilling and effectively cut off a high toughness aramid fiber, thus to improve the hole making quality of an AFRP-related component. It is proved that the new tool can significantly improve the hole making quality of an AFRP component, improve the service life and safety degree, and greatly reduce the processing cost. Therefore, the present invention has a broad application prospect in the fields of aerospace, military industries and civil application.

The invention relates to the technical field of aramid fibers, in particular to a heterocyclic aramid fiber and a preparation method thereof.The preparation method comprises the steps that S1, p-phenylenediamine, benzimidazole diamine and terephthaloyl chloride are subjected to a polymerization reaction in an amide solvent, and a polymer stock solution is obtained; s2, the polymer stock solution is subjected to spinning through a spinning nozzle, coagulating bath forming, drafting bath, alkali washing, water bath, drying, hot drafting, oiling and winding into a barrel, and the heterocyclic aramid fiber is obtained. In the step S1, the polymerization reaction temperature is-10 DEG C to 0 DEG C. According to the heterocyclic aramid fiber prepared by the preparation method, the problems of broken filaments, doubled filaments, sticky filaments, broken filaments and the like are obviously improved, the mechanical property is improved, the irregularity is reduced, and the product quality is excellent. The tensile strength of the heterocyclic aramid fiber is 30 to 37 cN / dtex, the elongation at break of the heterocyclic aramid fiber is 3.0 to 4.0 percent, and the elastic modulus of the heterocyclic aramid fiber is 950 to 1150 cN / dtex.

The invention discloses a bulletproof composite material and a preparation method thereof, and relates to the technical field of bulletproof composite materials. The bulletproof composite material is formed by compounding aramid fibers and a resin matrix, wherein the resin matrix comprises the following raw materials in parts by weight: 60-70 parts of epoxy resin, 5-8 parts of a modified toughening agent, 4-5 parts of a curing agent, 1-2 parts of a heat stabilizer, 1-2 parts of an inorganic filler, 0.5-1 part of a coupling agent and 2-5 parts of a wetting agent; the preparation method comprises the following steps: reacting cyanuric chloride with 4-hydroxyphenylboronic acid to generate an intermediate 1; reacting the intermediate 1 with 3-amino-1, 2-epoxypropane to generate an intermediate 2; reacting the intermediate 2 with cystamine to generate an intermediate 3, and reacting the intermediate 3 with dopamine to generate the modified toughening agent. The bulletproof composite material prepared by the invention has good ballistic protection performance, multiple impact resistance and self-repairing performance.

A preparation method of an emulsion type aramid fiber sizing agent belongs to the technical field of fiber surface treatment, and the specific scheme is as follows: preparing aromatic polyamide from corresponding diamine and acyl chloride, then reacting with epoxy resin to prepare modified epoxy resin, and preparing the emulsion type aramid fiber sizing agent under the action of a compound emulsifier. The preparation method disclosed by the invention is simple and relatively low in cost, better interface bonding can be formed between the aramid fiber and the epoxy resin after sizing by the sizing agent, and particularly, the interlayer shear strength of the aramid fiber / epoxy resin composite material is relatively well improved; the preparation method has important significance in improving the use performance and stability of the aramid fiber composite material and expanding the application of the aramid fiber.

The invention discloses a halogen-free flame-retardant benzoxazine-epoxy / aramid fiber composite material and a preparation method thereof, and belongs to the technical field of polymer composite materials. The composite material is obtained by heating and curing main chain type phosphorus-containing benzoxazine, epoxy resin and aramid fiber according to the mass fraction ratio of (1%-50%): (40%-70%): (30%-70%); the main chain type phosphorus-containing benzoxazine is prepared by carrying out Mannich condensation reaction on phosphorus-containing diamine, bisphenol and paraformaldehyde according to the molar ratio of 1: 1: (4.1-4.4). According to the prepared composite material, main chain type phosphorus-containing benzoxazine modified epoxy resin serves as a matrix, the matrix and aramid fibers are subjected to heating curing to prepare the composite material, benzoxazine is crosslinked with the aramid fibers and the epoxy resin when subjected to ring opening polymerization, the interface bonding performance between the aramid fibers and the epoxy resin can be remarkably improved, and the composite material can be used for preparing the aramid fibers and the epoxy resin. The mechanical property of the composite material can be effectively improved; meanwhile, benzoxazine contains phosphorus, so that the flame retardant property of the composite material can be improved, and the application field of the aramid fiber composite material is expanded.

The invention relates to the technical field of overhead conductors, and provides a corrosion-resistant overhead insulated conductor and a preparation method thereof. The corrosion-resistant overhead insulated wire sequentially comprises a conductor, an insulating layer and a sheath layer from inside to outside, and raw materials of the sheath layer comprise nitrile rubber, ethylene propylene diene monomer, a compatilizer, an activating agent, an anti-aging agent, filler, a softening agent, a plasticizer, a vulcanizing agent, an accelerant and a reinforcing agent; the preparation method of the reinforcing agent comprises the following steps: A1, cleaning aramid pulp, adding the aramid pulp into a calcium chloride solution, stirring, cleaning and drying to obtain pretreated aramid pulp; a2, mixing the pretreated aramid pulp and phenolic resin to obtain the reinforcing agent. According to the technical scheme, the problem of poor tensile strength of the sheath layer of the corrosion-resistant overhead insulated wire in the prior art is solved.

The invention relates to a fiber composite material, and discloses a preparation method of a para-aramid and natural rubber high interface performance composite material, which comprises the following four steps: preparing a chloroform solution of natural rubber, preparing a nano para-aramid-natural rubber composite mixing material, preparing impregnated para-aramid, and mixing and vulcanizing. According to the preparation method, the para-aramid is effectively connected with the matrix through the'bridge 'effect of the para-aramid nanophase by a method for constructing the para-aramid nanophase in the matrix material, so that the interfacial acting force of the para-aramid is enhanced, and the high performance of the para-aramid in the composite material is fully exerted; the problems of poor interfacial compatibility with a base material, low binding force and the like caused by smooth surface and chemical inertness of the para-aramid at present are effectively solved, and the para-aramid nanophase can also remarkably improve the strength and toughness of the base material.

The invention discloses a high-strength wear-resistant yarn and a manufacturing method thereof, and belongs to the field of spinning, the manufacturing process sequentially comprises the steps of opening, carding, drawing, roving and spinning, the raw materials used for opening comprise 70 wt% of aramid fiber and 30 wt% of cotton; in the spinning procedure, single yarns are twisted firstly, then two single yarns are plied to obtain plied yarns, the twist degree of the single yarns is 900-950 twists / m, the two single yarns have the same twist direction, and the single yarns and the plied yarns have opposite twist directions; and carrying out heat setting treatment on the plied yarn to obtain the high-strength wear-resistant yarn. Aramid fibers and cotton fibers in a specific proportion are selected as spinning raw materials, single yarns with specific twist are made and then reversely twisted to form plied yarns, finally, internal stress of the yarns is eliminated through heat setting treatment, the twist is stabilized, creep deformation in use is reduced, and the prepared yarns can be used in the industrial field, daily supplies, outdoor equipment and other products needing high wear resistance and have wide application prospects. The fabric is comfortable and soft, and the durability is improved.

The invention relates to the technical field of rubber materials, in particular to a high-strength and low-dielectric-loss epoxy resin composite material and a preparation method thereof. The epoxy resin composite material is prepared from the following raw materials in parts by weight: 100 parts of modified epoxy resin, 12 to 18 parts of cyanate ester resin, 40 to 50 parts of aramid fiber, 10 to 15 parts of filler, 15 to 25 parts of flexibilizer, 1 to 6 parts of first curing agent and 1 to 2 parts of accelerant. The epoxy resin composite material with high strength and low dielectric loss has the advantages of high strength, good impact resistance, high breakdown strength, low dielectric constant and low dielectric loss. The requirements of high-voltage power transmission equipment insulation parts, high-frequency circuit substrates, spacecraft lightweight structural members and the like on the fields with strict requirements on mechanical strength and dielectric properties can be met; and the preparation method is simple and controllable, the production cost is relatively low, and large-scale production can be realized.