38 results about "Poly(p-phenylene)" patented technology

The invention discloses an insulating material with corrosion resistance and a production process thereof, and relates to the technical field of insulating materials. The invention discloses an insulating material with corrosion resistance. The invention discloses a flame-retardant coating which is prepared from the following raw materials in parts by weight: 60 to 80 parts of bisphenol A epoxy resin, 20 to 30 parts of polyether-ether-ketone, 10 to 15 parts of nano aluminum nitride, 5 to 10 parts of boron fiber, 4 to 8 parts of molybdenum disulfide, 3 to 6 parts of poly (p-phenylene benzobisoxazole), 2 to 5 parts of vinyl trimethoxy silane, 20 to 30 parts of dimethyl sulfoxide, 8 to 12 parts of melamine cyanurate, 6 to 10 parts of magnesium aluminum hydroxide, 1 to 3 parts of Chimassorb 944 and 10 to 20 parts of modified polyvinyl alcohol. The coating is prepared from the following components in parts by weight: 20-30 parts of modified cellulose, 8-15 parts of modified cellulose, 3-7 parts of nano-zirconia, 5-10 parts of polysiloxane elastomer and 7-12 parts of fluorine-containing acrylate copolymer. The raw materials of the insulating material have a synergistic effect, and the prepared insulating material not only has conventional electrical insulation, but also has excellent heat resistance, corrosion resistance and the like, integrates hardness, flexibility, flame retardance and self-repairing performance, greatly expands the application range of the insulating material, and provides powerful support for industry development.

The invention discloses a battery diaphragm, a preparation method thereof and a secondary battery, and belongs to the technical field of batteries. The battery diaphragm comprises a base membrane and a heat-resistant layer stacked on the surface of at least one side of the base membrane, the heat-resistant fibers in the heat-resistant layer are selected from polyimide fibers, polyethylene glycol terephthalate fibers, polyamide-imide fibers, polyether-ether-ketone fibers, cellulose nanofibers, poly-p-phenylene terephthamide fibers, poly-m-phenylene isophthamide fibers, polyphenylene sulfide fibers and polyacrylonitrile fibers, and the heat-resistant fibers in the heat-resistant layer are selected from polyimide fibers, polyethylene glycol terephthalate fibers, polyamide-imide fibers, polyether-ether-ketone fibers, cellulose nanofibers, poly-p-phenylene terephthamide fibers, poly-m-phenylene isophthamide fibers, polyphenylene sulfide fibers and polyacrylonitrile fibers. The fiber is at least one of polyvinyl alcohol fiber and poly (p-phenylene benzobisoxazole) fiber; the thickness H1 of the heat-resistant layer and the thickness H2 of the base film satisfy 0.02 < = H2 / H1 < = 10; the porosity (X) of the base film and the porosity (Y) of the heat-resistant layer satisfy 20% < = X + Y < = 90% and 20% < = X < = 60%. The battery diaphragm can be baked at the temperature of 100 DEG C or above, and has relatively high puncture strength.

Provided is a speaker diaphragm that can uniformly increase rigidity throughout the entire area. A speaker diaphragm 1 of the present invention includes a base material having a resin matrix 2 with a thermoplastic resin as a main component and fibers 3 dispersed in the resin matrix 2, the fibers 3 being poly-p-phenylene benzobisoxazole fibers, the average length of the fibers 3 being 0.5 mm or more and 3.0 mm or less, and the content of the fibers in the base material being 3 mass% or more and 15 mass% or less.

The present invention relates to an aqueous sizing modified organic fiber and a preparation method thereof. The aqueous sizing modified organic fiber comprises a fiber body and a sizing layer autonomously adhered to the surface of the fiber body. The fiber body comprises aramid fiber, poly(p-phenylene benzobisoxazole) (PBO) fiber, polyester fiber and polyamide fiber. The thickness of the sizing layer is 3.0 - 5.33 nm, and the interfacial shear strength between the aqueous sizing modified aromatic organic fiber and epoxy resin is 54.4 - 65.22 MPa. Preparation method: Immerse the fiber body in a sizing agent, take it out, wash with water and dry it to form a sizing layer on the surface of the fiber body, thereby obtaining the aqueous sizing modified organic fiber. In the present invention, by controlling the pH value of the sizing agent, the thickness of the sizing layer on the fiber surface is controlled to be 3.0 - 5.33 nm, so that the sized modified organic fiber and epoxy resin have excellent interfacial bonding properties.

The invention relates to the technical field of friction materials, and discloses a stable-size and anti-adhesion friction material for an electromagnetic brake and a preparation method of the friction material. The friction material comprises the following raw materials: benzoxazine, bismaleimide, cyanate resin, butyronitrile rubber powder, zinc fibers, modified bamboo fibers, ceramic fibers, silicon carbide whiskers, calcium sulfate whiskers, modified poly (p-phenylene benzobisoxazole) pulp, calcined kaolin, precipitated barium sulfate, magnesium oxide and cashew nut shell oil modified phenolic resin coated amorphous silicon dioxide. The invention also discloses a preparation method of the modified layered magnesium phosphate. The friction material disclosed by the invention has excellent dimensional stability under damp and hot conditions and can avoid rusting of mating plates, so that adhesion and corrosion are avoided.

The present application relates to polyether ether ketone composite material technical field, disclose a kind of polyether ether ketone-based high temperature resistant composite material and its preparation method and application.Polyether ether ketone-based high temperature resistant composite material, raw material is by weight parts, including:polyether ether ketone 48~66 parts, modified polyarylate ether ketone 10~20 parts, composite filler 24~32 parts;The composite filler includes carbon fiber and poly-p-phenylene benzobisoxazole fiber.Preparation method: the formula amount of modified polyarylate ether ketone is dissolved in dipolar aprotic solvent, formula amount of carbon fiber is added and soaked, after removing solvent, get the sample of sizing;Formula amount of polyether ether ketone, prepared sizing sample and poly-p-phenylene benzobisoxazole fiber are mixed uniformly after heat pressing molding, obtain polyether ether ketone-based high temperature resistant composite material.The modified polyarylate ether ketone is applied to military, energy power, ship and submarine field.The polyether ether ketone-based high temperature resistant composite material provided by the present application improves the interfacial properties of polyether ether ketone and poly-p-phenylene benzobisoxazole fiber, polyether ether ketone and carbon fiber, thereby improving the tensile strength and bending strength of polyether ether ketone-based high temperature resistant composite material.

The present invention provides a secondary barrier for liquefied gas storage tank, characterized by comprising: a blocking layer containing (a) metal or (b) one or more polymers selected from the group consisting of polyethylene, polyethylene terephthalate, polyvinyl alcohol, ethylene-vinyl alcohol copolymer, and nylon; and a fiber layer laminated on both sides of the blocking layer, containing one or more fibers selected from the group consisting of glass fiber, polyethylene fiber, poly-p-phenylene benzobisoxazole fiber (PBO), aramid fiber, and carbon fiber, the fiber layer being fixed by an adhesive layer suitable for surface properties.

The application belongs to the field of polyester base cloth materials, and provides a high tensile strength polyester base cloth and a preparation method thereof, and constructs a modified polyester which can maintain excellent mechanical properties under high stress conditions. First, polyethylene glycol monomethyl ether is used to react with maleic anhydride to introduce flexible polyether chain segments and unsaturated double bond structures, and then free radical grafting of acrylic acid and ring-opening reaction of epichlorohydrin are used to introduce functional groups, so that the flexible chain segments have reactivity with polyester chains and other components, thereby enhancing the intermolecular compatibility and binding force in subsequent polymerization. In the preparation process of the polyester matrix, modified liquid crystal polyester and modified poly-p-phenylene benzobisoxazole are added to improve the tensile strength of the material through the rigid molecular chain structure thereof, and meanwhile, the flexible chain segments of the modified polyethylene glycol monomethyl ether and polytetrahydrofuran ether glycol effectively disperse internal stress, further improving the overall mechanical properties and structural stability of the material.

The invention relates to the technical field of air filtration, in particular to bio-based flame-retardant air filter paper and a preparation method thereof. The bio-based flame-retardant air filter paper comprises: base paper; the flame-retardant adhesive layer is compounded on the surface of the base paper; the base paper is prepared from raw materials including poly (p-phenylene benzobisoxazole) fibers, broadleaf wood fibers and coniferous wood fibers; the flame-retardant adhesive layer is prepared from a flame-retardant adhesive solution; the flame-retardant glue solution comprises styrene-butadiene latex, a flame retardant, carboxymethyl cellulose, a lubricant, potassium zirconium carbonate and water; the flame retardant is prepared from raw materials including a phytic acid solution and anhydrous calcium chloride. According to the flame-retardant adhesive layer provided by the invention, specific flame retardants phytic acid and anhydrous calcium chloride are adopted and matched with other specific components, so that good interaction can be realized, the flame retardance of the flame-retardant adhesive layer can be effectively improved, and the obtained filter paper is relatively large in dust holding capacity, relatively excellent in filtering performance and bursting resistance and relatively long in service life; no halogen hydride gas is generated during combustion, so that the environment-friendly effect is achieved.

The present invention discloses a lightweight and reboundable PKA thermal insulation aerogel and a preparation method thereof, belonging to the field of thermal insulation aerogels, which includes the following steps: The thermal insulation aerogel is composed of an aramid III nanofiber matrix with a hierarchical pore structure, a silane coupling agent (KH550), and a reinforcing filler. The reinforcing filler is prepared by freeze swelling of poly(p-phenylene benzobisoxazole) (PBO) fibers. Freeze swelling will promote the fibrillation of PBO fibers and provide favorable active sites to cooperate with KH550 to be uniformly dispersed into the aramid III nanofiber matrix. The coupling effect and the network structure formed by the mutual association and oligomerization after the hydrolysis of KH550 enhance the binding force between the matrix and the reinforcing phase, and construct an enhanced mechanical structure and pore structure for the thermal insulation aerogel. The present invention regulates the fiber size by the solvent method and optimizes the interfacial bonding, and combines the directional freezing technology to construct a porous structure, realizing the unity of light weight, reboundability, and high-efficiency thermal insulation. This aerogel is applicable to the thermal protection field under extreme environments.

The invention relates to the technical field of sodium batteries, in particular to a modified sodium vanadium phosphate positive electrode material and a preparation method and application thereof. The anion-doped sodium vanadium phosphate / carbon positive electrode material is constructed by introducing carbon and various anion-doped elements into the sodium vanadium phosphate positive electrode material, and the surface of the anion-doped sodium vanadium phosphate / carbon positive electrode material is further coated with poly-p-phenylene ethylene, so that a coating layer with a compact and stable structure is formed; the ionic conductivity, electronic conductivity and structural stability of the positive electrode material are enhanced, dissolution of vanadium metal in sodium vanadium phosphate and side reaction between the positive electrode and electrolyte can be inhibited, and the positive electrode material has excellent cycle performance and rate capability.

The invention relates to an intrinsic conductive solid aluminum electrolytic capacitor diaphragm and a preparation method thereof, and belongs to the technical field of aluminum electrolytic capacitors. The diaphragm is prepared from 50-80wt% of high-temperature-resistant fibrillated fibers, 10-30wt% of conductive fibers and 10-20wt% of adhesive fibers through a wet papermaking process. The high-temperature-resistant fibrillated fibers are selected from aramid fibers, polyacrylonitrile fibers or poly-p-phenylene benzobisoxazole (PBO) fibers, and are subjected to pulping treatment to form a micro-nano three-dimensional network skeleton, so that the diaphragm is endowed with excellent heat resistance and structural stability; the conductive fibers are selected from aluminum fibers, copper fibers, stainless steel fibers, carbon fibers, graphene modified fibers, polyacetylene fibers, polyaniline fibers, polypyrrole fibers and polythiophene fibers, a continuous conductive path is constructed, and the resistance of the diaphragm body is remarkably reduced; the bonding fibers are low-melting-point hot melting fibers, bonding nodes are formed through hot pressing, and the interlayer bonding force is enhanced. The diaphragm is suitable for solid-state capacitors in high-frequency and high-temperature scenes.

The present invention relates to a transmission belt comprising a compressed rubber layer. The compressed rubber layer comprises a crosslinked rubber composition, and the crosslinked rubber composition includes a rubber component and short fibers. The rubber component includes chloroprene rubber, and the short fibers include poly(para-phenylene benzobisoxazole)-based short fibers and aramid short fibers. The 4% bending modulus in a direction orthogonal to the orientation direction of the short fibers in the crosslinked rubber composition is 5 MPa or greater, and the 4% bending modulus in a direction parallel to the orientation direction of the short fibers in the crosslinked rubber composition is 2.5 MPa or less.

This invention discloses a method for preparing PBO-based multi-thermal-response sensing fibers and their application in high-temperature early warning. The preparation includes the following steps: S1, preparation of PNF dispersion; S2, preparation of PEDOT:PSS powder; S3, preparation of PEDOT:PSS@Te NWs; S4, preparation of Cs2NaInCl6:Mn 2+ Sb 3+ Preparation of crystals; S5, preparation of sensing fibers. This invention uses poly(p-phenylenebenzodioxazole) (PBO) fiber as the substrate and combines a thermoelectric and thermochromic dual-modal synergistic sensing mechanism, which has excellent flame retardancy, high mechanical strength, ultra-sensitive thermal response, and wide-range visual temperature detection performance.

The present invention provides an N-doped porous flexible carbon paper and its preparation method and application. The N-doped porous flexible carbon paper of the present invention is prepared from poly (p-phenylene benzobisoxazole) fibers, the carbon paper has a layered structure, the nitrogen content in the carbon paper is ≥5.4wt%, and the specific surface area of ​​the carbon paper is ≥450m 2 / g, an average pore size of 1μm to 3μm, and a tensile strength of ≥0.12MPa. The N-doped porous flexible carbon paper of the present invention has excellent flexibility, a high nitrogen content, a suitable specific surface area, and a layered fiber structure. It can be used as a cathode material for flexible zinc-air batteries, capable of fixing active catalysts and preventing charge and discharge termination in flexible zinc-air batteries.

This invention relates to the field of materials technology, and provides a composite insulating paper and its preparation method. The method includes: functionalizing BNNS with polydopamine (PDA) to obtain BNNS@PDA; preparing gallium-indium alloy (LM) using gallium and indium as raw materials; dispersing the gallium-indium alloy LM in polyvinyl alcohol (PVA) by electrospinning to obtain PVA@LM nanofibers; adding poly(p-phenylenebenzodioxazole) (PBO) fibers, BNNS@PDA, and PVA@LM nanofibers to deionized water and shearing to obtain a composite solution; spraying the composite solution onto a substrate to form a thin film; and immersing the thin film in a solution containing C8H... 10 After being immersed in an O8 solution, the material is removed and subjected to a curing and cross-linking reaction to obtain a cured cross-linked film. The cured cross-linked film is then cooled, rinsed, and dried to obtain rough paper. The rough paper is then hot-pressed to obtain composite insulating paper. Compared with existing insulating paper, the composite insulating paper provided by this invention has significantly improved thermal conductivity. The method provided by this invention is simple and low in cost.

The invention discloses a colored poly (p-phenylene benzobisoxazole) fiber and a preparation method and system thereof, and belongs to the field of preparation of high-performance fiber materials.A PBO initial polymer, a colored PBO initial polymer, a colored PBO prepolymer and a colored PBO polymer are prepared in stages through the deconstruction PBO polymerization process, and the colored PBO initial polymer, the colored PBO prepolymer and the colored PBO polymer are prepared on the basis of accurate temperature regulation and control and online viscosity monitoring technologies. According to the present invention, the optimal control of the material viscosity at each stage is achieved, the pigment is dispersed in the low-viscosity PBO primary polymer system, and the viscosity change at each stage in the polymerization process is cooperatively regulated so as to effectively prolong the mixing window period of the PBO polymer and the pigment, such that the efficient and uniform dispersion and the stable dyeing of the pigment are achieved.

The invention provides a high-temperature-resistant high-strength low-wear self-lubricating fabric liner composite material, a preparation method thereof and a friction pair. The high-temperature-resistant high-strength low-wear self-lubricating fabric liner composite material comprises a blended fabric and thermosetting resin serving as a binder, wherein the blended fabric is obtained by weaving lubricating fibers and reinforcing fibers, the lubricating fibers comprise polytetrafluoroethylene fibers, and the reinforcing fibers comprise poly (p-phenylene benzobisoxazole) fibers; the thermosetting resin comprises polyimide resin. According to the self-lubricating fabric liner composite material provided by the invention, high-modulus, high-strength and high-temperature-resistant poly (p-phenylene benzobisoxazole) fibers and polytetrafluoroethylene fibers with excellent lubricating performance are interwoven, and polyimide with outstanding mechanical properties, heat resistance and wear resistance is adopted as a binder. Under the synergistic effect of the three components, the obtained self-lubricating fabric liner material has excellent antifriction and wear-resisting properties and can be suitable for the working condition at the high temperature of 300 DEG C.

This utility model discloses a double-sheathed antistatic and tensile-resistant rail transit control cable. It relates to the field of cable technology and employs a control cable core and a tensile layer. The control cable core is configured with five groups, and a flame-retardant filling layer is provided on the outside of each core. A central tensile-resistant filling rope is provided in the center of the flame-retardant filling layer. This utility model increases the tensile strength of the entire control cable by providing a central tensile-resistant filling rope made of poly(p-phenylene benzodioxazole) fiber material. The flame-retardant filling layer made of glass fiber material, which has excellent high-temperature resistance and fire resistance, improves the flame-retardant effect of the control cable. The use of a first antistatic layer and a second antistatic layer, the first being made of polyvinyl chloride (PVC) and the second being made of conductive fiber material, significantly enhances the antistatic effect of the control cable.

The present invention provides a poly(p-phenylene benzobisoxazole) absorbing aerogel, its preparation method, and its application, belonging to the technical field of absorbing materials. The poly(p-phenylene benzobisoxazole) absorbing aerogel provided by the present invention has a closed-cell foam structure, comprising an aerogel matrix formed of poly(p-phenylene benzobisoxazole), carbon nanotubes dispersed within the aerogel matrix, a silane coupling agent grafted onto the aerogel matrix, and a nanoscale metal-based material supported on the aerogel matrix. The nanoscale metal-based material is a metal oxide, metal hydroxide, or alloy. The poly(p-phenylene benzobisoxazole) absorbing aerogel provided by the present invention has the advantages of being lightweight, broadband, and having high absorption.

A speaker diaphragm includes a substrate. The substrate includes a resin matrix and fibers. The resin matrix contains a thermoplastic resin as a main component. The fibers are dispersed in the resin matrix. The fibers are polyparaphenylenebenzobisoxazol fibers. An average length of the fibers is 0.5 mm or more and 3.0 mm or less.

The application provides a multilayer fiber reinforced composite material and a preparation method thereof. The multilayer fiber reinforced composite material is prepared by hot pressing and curing a prepreg stack, and the prepreg stack comprises: an alumina fiber plain cloth prepreg located at the center, and high-modulus poly-p-phenylene benzobisoxazole fiber unidirectional cloth prepregs, alumina fiber unidirectional cloth prepregs and high-strength glass fiber plain cloth prepregs symmetrically distributed on both sides of the alumina fiber plain cloth prepreg from inside to outside. The alumina fiber plain cloth prepreg, the high-modulus poly-p-phenylene benzobisoxazole fiber unidirectional cloth prepreg, the alumina fiber unidirectional cloth prepreg and the high-strength glass fiber plain cloth prepreg are all combined by corresponding fiber cloth and epoxy resin adhesive film through hot pressing. The multilayer fiber reinforced composite material is super-thin, has strong impact resistance and puncture resistance, and is environmentally friendly in process.

The invention discloses poly (p-phenylenebenzobisoxazole) (PBO) and para-aramid fiber composite meta-aramid paper and a preparation method thereof in the field of chemical papermaking, the composite meta-aramid paper takes meta-aramid fibers as a main body, and the para-aramid fibers and poly (p-phenylenebenzobisoxazole) fibers are added to form a ternary composite system; and two interface modification compounds, namely phosphorus and nitrogen containing flame-retardant epoxy functionalized cage type silsesquioxane and hyperbranched polyaryletherketone-benzoxazole, are innovatively introduced. The preparation process comprises the key steps of fiber pretreatment, slurry preparation, wet papermaking, hot-pressing compounding and the like. By accurately controlling fiber ratio, slurry concentration and hot pressing process parameters, advantage complementation and interface strengthening of the three high-performance fibers are realized. The obtained composite material has excellent mechanical strength, high temperature resistance, electrical insulation property and flame retardant property, keeps good flexibility and processability, and is suitable for the fields of high-end electrical insulation, aerospace, protective materials and the like.

Provided are a molded body, a composite material for producing the molded body, and a method for producing the composite material. The molded body is formed from a composition containing a resin and fibers (X) containing poly (p-phenylene benzobisoxazole), and the proportion of the fibers (X) is 50% by mass or more with respect to 100% by mass of the poly (p-phenylene benzobisoxazole) contained in the composition.

The present invention relates to the field of Joule heating technology, and in particular to a high thermal conductivity composite film, a preparation method thereof, and an application thereof. The preparation method provided by the present invention comprises the following steps: blending hydroxyl-modified poly(p-phenylene benzobisoxazole) fiber and polyetheretherketone fiber to obtain PBO-OH / PEEK fiber cloth; mixing a soluble polyetheretherketone solution, NH2-MWCNTs, and GnPs, and ultrasonicating to obtain a spraying liquid; using an electrostatic spraying method, spraying the spraying liquid on the upper and lower surfaces of the PBO-OH / PEEK fiber cloth, and hot pressing to obtain the high thermal conductivity composite film. The high thermal conductivity composite film prepared by the preparation method has excellent mechanical properties as well as excellent in-plane thermal conductivity, electrical conductivity, and electromagnetic shielding effect.

The invention discloses a police protective material and a preparation method thereof. The material is divided into a double-layer structure including a puncture-resistant surface layer and a composite energy-absorbing bottom layer in the impact direction. The puncture-resistant surface layer is composed of poly (p-phenylene benzobisoxazole) fibers, aramid fibers and UHMWPE fibers, the PBO fibers are densely woven in a hexagonal honeycomb shape, and the aramid fibers and the UHMWPE fibers are wound through a double-helix structure. The composite energy-absorbing bottom layer is formed by filling polyurethane foam into an aluminum alloy honeycomb framework subjected to micro-arc oxidation treatment and is bonded with the puncture-resistant surface layer in a hot-pressing mode through a copolyamide hot melt adhesive film, and the total thickness is only 10-15 mm. The preparation method comprises the steps of fiber double-helix winding, honeycomb weaving, micro-arc oxidation, polyurethane injection molding and the like. Through the synergistic effect of honeycomb rigid puncture resistance, spiral friction energy absorption and foam plastic deformation, the thickness of the material is reduced by 40% compared with that of a traditional product under the same protection capacity, and the material has the advantages of light weight and high protection performance and is suitable for police equipment such as body armor and the like.

The novel plastic functional wooden dummy comprises a wooden dummy body and a balance weight base, and the balance weight base is fixedly installed at the bottom of the wooden dummy body, is formed by welding steel plates and is filled with balance weights; the wood pile body further comprises a pile body core framework which is made of high-density polyethylene. The buffer layer covers the exterior of the pile body core framework and is made of a low-density polyethylene resin foaming body; the surface of the buffer layer is covered with the contact layer, the contact layer is formed by weaving poly (p-phenylene benzobisoxazole) fibers, and the surface of the contact layer is impregnated with a silicone rubber layer. Compared with a traditional wooden dummy, the novel plastic functional wooden dummy is 70% lighter than a traditional wooden dummy through a polymer dummy body core material, free of cracking hidden danger and durable, the framework, the base and the dummy hands are disassembled and assembled, quick disassembly within 3 minutes is achieved, 80% of the containing space is saved, finally, zero-pain beating is achieved through the polymer elastic layer buffering technology, and the novel plastic functional wooden dummy is suitable for multiple scenes.

The present invention discloses a concrete anti-corrosion admixture, as well as its preparation and use methods. The anti-corrosion admixture comprises the following components, by weight: 40-50 parts GHL powder, 45-55 parts poly(p-phenylene benzobisoxazole) fiber, 20-30 parts light-burned magnesium oxide, and 5-10 parts nanocellulose. The GHL powder includes polyacrylamide and modified tuff-limestone mineral powder. This admixture improves the concrete's anti-corrosion properties by enhancing its compactness and hydrophobicity, reducing the decomposition of calcium hydroxide, and thereby delaying calcium dissolution.

The invention provides a multi-layer composite structure, a preparation method, a battery cover and electronic equipment, the multi-layer composite structure is formed by a plurality of stacked fiber layers, each fiber layer is formed by dipping a fiber sheet in a pre-polymerized glue solution and then curing the fiber sheet, the fiber sheet in at least one fiber layer adopts poly (p-phenylene benzobisoxazole) fiber, and the fiber sheet in the at least one fiber layer is made of a poly (p-phenylene benzobisoxazole) fiber. The PBO fiber is prepared from the PBO fiber. Therefore, the multi-layer composite structure has higher strength and modulus, energy is absorbed and dispersed when the multi-layer composite structure is impacted, the reliability of the multi-layer composite structure is not influenced when the multi-layer composite structure is impacted on the basis of thinning and weight reduction, and the battery cover formed by the multi-layer composite structure has better anti-puncture performance.

The application discloses a kind of colored poly-p-phenylene benzobisoxazole fibers and its preparation method and system, belong to high-performance fiber material preparation field, by deconstructing PBO polymerization process, PBO primary polymer, colored PBO primary polymer, colored PBO prepolymer and colored PBO polymer are prepared in stages, and based on temperature precision control and online viscosity monitoring technology, the viscosity of each stage material is optimized and controlled, by dispersing pigment in low-viscosity PBO primary polymer system, and the viscosity change of each stage in polymerization process is synergistically controlled, effectively extend the mixing window period of PBO polymer and pigment, to realize the efficient uniform dispersion and stable dyeing of pigment.