1994 results about "Acrylonitrile" patented technology

The invention provides a novel acrylonitrile catalyst and a preparation method thereof. The novel acrylonitrile catalyst is prepared from the following raw materials: mixed salt, an active component, silica sol, a rare earth precursor, a carrier and a cosolvent, by introducing the cosolvent and optimizing the carrier structure, the dispersity of the rare earth precursor is improved, the production process is optimized, the doping efficiency of the rare earth precursor is remarkably improved, the activity, selectivity and stability of the novel acrylonitrile catalyst are improved, generation of by-products CO, CO2, acrolein and acrylic acid during acrylonitrile production can be reduced, and industrial efficient preparation is achieved.

The invention relates to the technical field of organic synthesis, and discloses a preparation method of bromo-pyrrole nitrile. The method comprises the following steps: (1) mixing p-chlorophenylglycine, acetonitrile, trifluoroacetic acid and a catalyst, then dropwise adding acyl chloride and carrying out acylation reaction, and after the reaction is completed, purging with an inert gas; (2) under the inert gas, mixing the mixture obtained in the step (1) with inorganic salt, then dropwise adding 2-chloroacrylonitrile, carrying out cyclization reaction, and separating a liquid phase from the obtained mixture; and (3) under the inert gas, mixing the liquid phase obtained in the step (2), hydrobromic acid and hydrogen peroxide, carrying out a bromination reaction, then extracting with acetonitrile to obtain an acetonitrile layer, then removing the acetonitrile, and then carrying out cooling crystallization to obtain the bromo-pyrrolenitrile. According to the technical scheme, the reaction yield is high, different solvents do not need to be frequently replaced, and the solvents can be recycled.

The invention discloses a lithium battery polymer solid electrolyte membrane capable of rapidly polymerizing at room temperature as well as a preparation method and application thereof, and belongs to the field of polymer electrolyte. The preparation method of the lithium battery polymer solid electrolyte membrane provided by the invention comprises the following steps: uniformly mixing polyethylene glycol methyl ether methacrylate and acrylonitrile according to a preset proportion to obtain a blended solution; sequentially adding lithium bis (trifluoromethanesulfonimide), divinylbenzene and benzoin diethyl ether into the blended solution, and uniformly mixing to obtain a precursor solution; and coating the precursor solution, and carrying out ultraviolet curing to obtain the lithium battery polymer solid electrolyte membrane. According to the lithium battery polymer solid electrolyte membrane provided by the invention, the voltage withstanding characteristic and the high ion conduction performance of the polymer electrolyte can be simultaneously improved, and the lithium battery polymer solid electrolyte membrane has a great gain on battery circulation and stability.

The invention relates to a flexible aqueous binder for a lithium battery negative electrode and a preparation method thereof. The preparation method comprises the following steps: firstly, preparing a flexible polyurethane prepolymer containing vinyl by taking hydroxyl-terminated polybutadiene, isocyanate and hydroxyl acrylate as main raw materials; vinyl-containing compounds such as water-soluble acrylic acid (salt) or acrylamide, oil-soluble acrylic ester or acrylonitrile and the like are used as monomers and are combined with a flexible polyurethane prepolymer to prepare the negative water-based binder with flexible cross-linking points through free radical polymerization. The aqueous binder prepared by the technical method provided by the invention can realize point-to-point and point-to-line bonding modes with a pole piece active substance on a microstructure, so that the bonding strength of the active layer material and a copper foil is improved on the premise of not influencing the electrolyte resistance of the binder; and the flexibility of the negative pole piece and the subsequent processing stability are obviously improved.

The invention provides a high-temperature thermal expansion microsphere with rapid foaming response and a preparation method of the high-temperature thermal expansion microsphere. The high-temperature thermal expansion microsphere comprises an olefinic unsaturated monomer, the olefinic unsaturated monomers comprise the following components in percentage by weight: 40 to 60 percent of acrylonitrile monomers, 10 to 20 percent of acrylic acid monomers, 10 to 20 percent of acrylamide monomers and 5 to 30 percent of cage type polysilsesquioxane monomers containing double-bond monofunctional groups; the double-bond monofunctional polyhedral oligomeric silsesquioxane monomer is used for participating in polymerization to form a microsphere shell. The foaming response speed of the microspheres can be remarkably improved, and the microspheres have high foam breaking temperature and high expansion performance.

The invention discloses a flame-retardant ABS (Acrylonitrile Butadiene Styrene) composition as well as a preparation method and application thereof, and relates to the technical field of high polymer materials. The flame-retardant ABS composition provided by the invention comprises the following components in parts by mass: 50-80 parts of ABS resin; 8 to 12 parts of styrene-acrylonitrile copolymer; 3 to 5 parts of styrene-acrylonitrile-maleic anhydride terpolymer; 2 to 6 parts of a fluorine-containing maleimide copolymer; 5 to 15 parts of graphite nanosheet modified high rubber powder; 12 to 18 parts of brominated flame retardant; 3-7 parts of a phosphorus-based flame retardant; 0.1-1 part of a processing aid; the phosphorus-based flame retardant is prepared from the following components in parts by mass: 80 to 95 parts of diethyl phosphinate; 0.3 to 3 parts of ethyl butyl phosphinate; 0.1 to 2 parts of ethyl phosphonate; and 5 to 20 parts of melamine polyphosphate. The flame-retardant ABS composition prepared by the invention is good in flame retardant property, good in welding strength and low in cost.

The invention relates to the technical field of polyvinyl chloride, and discloses a preparation process of a high-strength and high-thermal-stability PVC (polyvinyl chloride) material for a decorative film, which comprises the following steps: mixing polyvinyl chloride, acrylonitrile-butadiene-styrene copolymer, cyano polyesteramide, a stabilizer, a plasticizer, an antioxidant and the like, extruding in a twin-screw extruder, and granulating, the PVC material with high strength and high thermal stability is obtained. The cyano polyesteramide can improve the compatibility between ABS and PVC, so that the material has better mechanical properties, the polyesteramide has a hyperbranched molecular chain structure and plays a certain role in toughening, the compatibility between ABS and PVC is better, the vicat softening temperature of the material is increased, the thermal stability of the material is enhanced, and when the cyano polyesteramide is applied to materials such as decorative films, the material has better mechanical properties. Decorative films and the like can have good heat resistance and are not prone to aging and yellowing.

The utility model discloses a system for recycling and treating waste liquid in the carbon fiber industry. The system comprises a spinning dilute solvent pretreatment unit and a receipt solution pre-separation unit, the spinning dilute solvent pretreatment unit comprises at least one stage of dehydrating tower; the receipt solution pre-separation unit comprises a pretreatment tower TVII; the tower top of the pretreatment tower TVII leads to an acrylonitrile refining tower TVIII; the tower kettle of the last stage of dehydration tower and the tower kettle of the pretreatment tower TVII are both led to a core residue removal device, the discharge port of the core residue removal device is led to a deep dehydration tower TV, and the tower kettle of the deep dehydration tower TV is led to a DMSO refining tower TVI. According to the utility model, the carbon fiber receipt solution and the spinning dilute solvent are combined to obtain ultra-high-purity acrylonitrile, DMSO and process water, and the ultra-high-purity acrylonitrile, DMSO and process water can be returned to carbon fiber production for use.

The invention discloses a polyacrylonitrile carbon fiber and a preparation method thereof, and the method comprises the following steps: (1) copolymerizing acrylonitrile and acrylamidine to obtain a polymer spinning solution; (2) sequentially carrying out spinning, solidification forming, first-stage drafting, washing, oiling, drying, second-stage drafting and heat setting on the polymer spinning solution to obtain a polyacrylonitrile precursor; and (3) sequentially carrying out pre-oxidation and carbonization treatment on the polyacrylonitrile precursor to obtain the polyacrylonitrile carbon fiber. Therefore, by adopting the method, the radial structure difference of the nascent fiber can be effectively controlled, the radial structure of the obtained nascent fiber is more homogeneous, and the radially homogeneous polyacrylonitrile precursor is obtained, so that the prepared carbon fiber is more excellent in performance or larger in diameter, and meanwhile, an ammonification process link is omitted.

The present disclosure relates to a fluoride-free binder material for a positive electrode, and a preparation method therefor and the use thereof. Provided are a fluoride-free binder material for a positive electrode and a preparation method therefor. A copolymer of acrylonitrile and an acrylate is used as a main body structure, an ionic monomer is introduced, and a polyfunctional olefin monomer is introduced during polymerization to increase the branching degree of a polymer, thereby preparing a highly-branched acrylonitrile polymer modified via copolymerization, which polymer is used as a fluorine-free binder material for a positive electrode. The modified binder can provide more sites for contact between active materials and between a current collector and the active materials so as to further enhance the bonding ability, thereby increasing the overall cohesive force and improving the adhesion to the current collector; and the binder can effectively inhibit the fracture and delamination of an electrode sheet during processing, ensures the compactness of a positive electrode material even in the case of a low use amount, and retains structural integrity and cycling stability during cycling.

The invention discloses a multi-hydrogen bond enhanced fluorine-containing core-shell water-based binder as well as a preparation method and application thereof, and relates to the technical field of lithium ion silicon-based negative electrode binders. The preparation method comprises the following steps: dissolving methyl methacrylate, acrylonitrile and an emulsifier in water, carrying out a polymerization reaction to obtain a rigid core emulsion, adding acrylic acid long-chain ester, a fluorine-containing monomer and acrylamide, carrying out a mixing reaction to obtain a core-shell structure emulsion, mixing the core-shell structure emulsion with a sodium alginate solution, adding nano SiO2, and carrying out a polymerization reaction to obtain the high-temperature-resistant water-based acrylic emulsion. And after the reaction is finished, obtaining the multi-hydrogen bond enhanced fluorine-containing core-shell water-based adhesive. Through core-shell structure design and introduction of a multiple hydrogen bond network, the problem of bonding caused by volume expansion of the silicon negative electrode material in the charging and discharging process is successfully solved, the cycle life and stability of the battery are remarkably prolonged, meanwhile, the environment-friendly characteristic and the process simplicity are considered, and the preparation method is simple and convenient. And an efficient and sustainable development solution is provided for the field of lithium ion batteries.

The invention provides a preparation method of high-performance polyacrylonitrile pre-oxidized fibers, and belongs to the technical field of preparation of carbon filaments from polyacrylonitrile. The preparation method comprises the following steps: adding hydroxylated carbon nanotubes into deionized water, performing ultrasonic dispersion, adding a modifier and a catalyst, continuing ultrasonic dispersion, heating to 80-90 DEG C, performing constant-temperature reaction, fully washing with water, and drying to obtain modified carbon nanotubes; dispersing the modified carbon nanotube in an N, N '-dimethylformamide solution, adding an acrylonitrile monomer, hydroxyethyl acrylate and an initiator, copolymerizing to form a carbon nanotube / acrylonitrile copolymer, and spinning to obtain a carbon nanotube / acrylonitrile copolymer fiber; the carbon nano tube / acrylonitrile copolymer fiber is placed in a microwave treatment device, and a plurality of microwave generators are arranged in the microwave treatment device and are used for carrying out segmented pre-oxidation on the carbon nano tube / acrylonitrile copolymer fiber. The problems that an existing polyacrylonitrile fiber pre-oxidation technology is high in energy consumption and low in strength, poor in flame retardance and the like due to the difference between internal and external pre-oxidation effects can be solved.

The invention relates to the technical field of cables, and provides a long-life cable for nuclear power, which sequentially comprises a conductor, an insulating layer, a shielding layer and a sheath layer from inside to outside, the sheath layer comprises the following components in parts by weight: 60-70 parts of high-density polyethylene, 12-22 parts of carboxy nitrile rubber, 4-8 parts of a styrene-acrylonitrile copolymer, 0.5-8 parts of a copper metal organic complex, 8-15 parts of palygorskite powder, 2-5 parts of zinc oxide, 0.5-1.3 parts of an antioxidant, 1-3 parts of a plasticizer and 0.2-0.5 part of a vulcanizing agent; the copper metal organic complex comprises copper trifluoromethanesulfonate and copper acetylacetonate in a weight ratio of (1-3): 1. According to the technical scheme, the problem of poor aging resistance of the sheath layer of the nuclear power cable in the prior art is solved.

The invention belongs to the field of intelligent wearing, and discloses a multifunctional wearable composite fiber membrane and a preparation method and application thereof. The multifunctional wearable composite fiber membrane is of a sandwich structure, the upper layer is a fullerene hybridized phosphorene modified polyacrylonitrile membrane, the lower layer is a polyurethane membrane, and the middle layer is a silver nanowire layer. The preparation method comprises the following steps: firstly, preparing fullerene hybridized phosphorene nanosheets, dispersing the fullerene hybridized phosphorene nanosheets into a solvent to obtain fullerene hybridized phosphorene dispersion liquid, adding the fullerene hybridized phosphorene dispersion liquid into a polyacrylonitrile solution, stirring to obtain a fullerene hybridized phosphorene / polyacrylonitrile spinning solution, and carrying out electrostatic spinning to obtain the fullerene hybridized phosphorene modified polyacrylonitrile fiber membrane. And then rolling or spraying a silver nanowire layer, covering one side of the silver nanowire layer with a polyurethane fiber membrane, drying and pressing to obtain the composite material. The composite fiber membrane prepared by the invention has good mechanical properties, air permeability, one-way moisture conduction performance, antibacterial performance, heat dissipation performance, electromagnetic shielding performance and flame retardant performance, and has a wide application prospect in the field of flexible wearable intelligent equipment.

The invention relates to the field of building waterproof materials, and discloses a composition for a modified asphalt coating material, the modified asphalt coating material, a preparation method and application of the modified asphalt coating material, an energy-saving waterproof coiled material and application of the energy-saving waterproof coiled material. The composition contains a main agent and an auxiliary agent, wherein the main agent comprises matrix asphalt, epoxidized soybean oil, star-shaped SBS, a thermoplastic polyurethane elastomer, butadiene styrene rubber, hydrogenated butadiene-acrylonitrile rubber and a first component; on the basis of the total weight of the composition, the content of the matrix asphalt is 40-55 wt%, the content of the epoxidized soybean oil is 5-10 wt%, the content of the star-shaped SBS is 3-5 wt%, the content of the thermoplastic polyurethane elastomer is 1-8 wt%, the content of the styrene butadiene rubber is 1-5 wt%, the content of the hydrogenated butadiene-acrylonitrile rubber is 5-10 wt%, and the content of the plasticizer is 1-5 wt%. And the content of the first component is 1-2wt%. The modified asphalt waterproof coiled material provided by the invention has the advantages of strong adhesion, good stretchability and weather resistance and the like.

The present invention provides an organic phosphonic acid betaine and a preparation method thereof, specifically an ammonium phosphonic acid betaine containing a glycidyl group. The organic phosphonic acid betaine can be used as a functional monomer for free radical grafting modification of the surface of a polymer material such as polyolefin, or can be mixed with acrylate, acrylonitrile or other olefin monomers for copolymerization to prepare an amphoteric ionomer. The organic phosphonic acid betaine can also be used for ring-opening grafting modification of polymer materials such as starch, cellulose, polyurethane, and polyamide containing amino or hydroxyl groups in their structures. At the same time, the phosphonic acid betaine imparts functional effects such as zwitterionization, hydrophilicity, antibacterial properties, and antifouling properties to the obtained polymer material. The organic phosphonic acid betaine also has high chemical stability in acidic and alkaline water environments.

The invention discloses a preparation process of cutting-resistant and puncture-proof protective gloves, and belongs to the technical field of preparation methods of protective gloves. According to the technology, the four steps of pretreatment, composite coating material dipping, dipping of different butadiene-acrylonitrile rubber latexes and partitioned vulcanization treatment are adopted, balance of protection performance and wearing comfort is achieved through combination of technology optimization and material innovation, the cutting resistance of the prepared protective gloves reaches the grade E of the GB24541-2022 standard, the puncture resistance and the tear resistance both reach the grade 4, and the service life of the protective gloves is prolonged. And the composite material is good in air permeability and excellent in durability, is particularly suitable for high-risk operation scenes such as military, security and metal processing, and has remarkable technical progress and industrialization value.

The invention relates to the technical field of macromolecules, in particular to a ceramic flame-retardant PC / ABS alloy material and a preparation method thereof. Comprising the following raw materials in parts by weight: 55-65 parts of polycarbonate, 30-40 parts of an acrylonitrile-butadiene-styrene copolymer, 0.1-1 part of a compatilizer, 0.1-1 part of a flexibilizer, 1-10 parts of ceramic powder, 3-8 parts of an inorganic composite nano filler, 1-10 parts of a flame retardant, 0.1-1 part of a silane coupling agent and 0.1-0.5 part of an antioxidant. The preparation method of the ceramic flame-retardant composite material mainly comprises the following steps: drying the raw materials, uniformly mixing the raw materials, processing and extruding, and carrying out injection molding, and by adopting the synergistic effect of the ceramic powder and the flame retardant, the PC / ABS alloy material is endowed with excellent flame retardance while good mechanical properties of the PC / ABS alloy material are ensured.

The invention relates to the technical field of power cables, and provides a marine power cable which comprises a conductor, an insulating layer, an armor layer and a sheath layer are sequentially arranged on the outer side of the conductor, and the sheath layer is prepared from, by weight, 40-50 parts of polyethylene, 35-45 parts of methyl vinyl silicone rubber, 30-40 parts of nitrile rubber, 8-10 parts of plasticizer, 40-60 parts of filler, 1-2 parts of antioxidant and 1-3 parts of vulcanizing agent; the nitrile rubber is composed of nitrile rubber A, nitrile rubber B and nitrile rubber C, and the nitrile rubber A, nitrile rubber B and nitrile rubber C have different molecular structures; the nitrile rubber A is obtained by polymerizing butadiene and acrylonitrile; the nitrile rubber B is obtained by catalytic hydrogenation of nitrile rubber; and the nitrile rubber C is obtained by ternary polymerization of butadiene, acrylonitrile and organic acid. According to the technical scheme, the problem of poor corrosion resistance of the marine power cable in the prior art is solved.

The invention relates to a sealing structure of a flexible waterproof FFC wire harness and a forming process, and belongs to the technical field of automobile electronic wire harness manufacturing, the sealing structure comprises an FFC wire, a connector shell, a sealing ring and a blanking cap, the sealing ring is made of a fluororubber and hydrogenated butadiene-acrylonitrile rubber composite modified material, the connector shell is made of a glass fiber reinforced PP or PA66 material, and the blanking cap is made of a glass fiber reinforced PP or PA66 material. Under the cooperation of a vulcanizing agent system and an anti-aging agent system, double-material injection molding is adopted for integral forming, and double sealing is achieved through interference fit of the blanking cap and the sealing ring. The waterproof grade of the FFC wire harness reaches IP67, the weight is reduced, the size is reduced, the production efficiency is improved, and the FFC wire harness can be widely applied to wet area scenes such as automobile door lines, ceilings and seats, has the cost advantage and the environmental protection benefit, and has remarkable industrial application value.

The invention discloses a polyacrylonitrile pre-oxidation method and application thereof and a preparation method of polyacrylonitrile-based high-modulus carbon fiber, the polyacrylonitrile pre-oxidation method comprises the following steps: pre-oxidizing polyacrylonitrile in at least three temperature zones in sequence in an air atmosphere, the first three temperature zones are controlled according to the sequence of pretreatment: the temperature of the first temperature zone is controlled to be 180-230 DEG C, the temperature of the second temperature zone is controlled to be 210-260 DEG C, and the temperature of the third temperature zone is controlled to be 250-300 DEG C. According to the method, the cyclization degree of the fiber in the pre-oxidation stage is used as a structure control index, and the pre-oxidation fiber with a perfect structure is prepared through regulation and control design of key parameters such as the pre-oxidation temperature, the drafting rate and the retention time, so that the high-model carbon fiber is prepared.

The invention relates to a dry-jet wet-spinning ultra-high-performance polyacrylonitrile-based carbon fiber and a preparation method thereof, and belongs to the technical field of carbon fibers. A preparation method of dry-jet wet-spinning ultra-high-performance polyacrylonitrile-based carbon fiber comprises the following steps: S1, mixing acrylonitrile, a comonomer, a chain transfer agent, an initiator and a solvent, carrying out polymerization reaction through a solvent dropwise addition method, and preparing a spinning solution; wherein the comonomers comprise a first comonomer, a second comonomer and a third comonomer; s2, the spinning solution is subjected to solidification, water washing, water drawing, oiling, drying and steam drawing, and precursor fibers are obtained; s3, the precursor fiber is sequentially subjected to pre-oxidation, low-temperature carbonization, high-temperature carbonization, graphitization, surface treatment, sizing and drying, and the ultra-high-performance polyacrylonitrile-based carbon fiber is prepared. Wherein the pre-oxidation adopts four-stage pre-oxidation treatment. The strength and modulus of the carbon fiber can be effectively and synergistically optimized, and the carbon fiber with high strength and high modulus is prepared.

The invention belongs to the technical field of polyurethane, and particularly relates to multi-element synergistic flame-retardant polymer polyol and a preparation method thereof. The flame-retardant polyether polyol is prepared from phosphorus-halogen mixed flame-retardant basic polyether polyol, a halogen-containing flame-retardant vinyl unsaturated monomer, a silicon-containing flame-retardant vinyl unsaturated monomer, a nitrogen-containing modified polyether dispersant, styrene, acrylonitrile, an initiator and a chain transfer agent through reaction. The halogen-containing monomer introduced into the POP polymerization monomer directly participates in free polymerization, and cooperates with the flame-retardant elements in the basic polyether, so that the content of the flame-retardant elements in the POP can be effectively increased, and the flame retardance is improved. A vinyl silicon structure is added in a POP polymeric monomer, and a silicon element is introduced into a molecular chain, so that the flame retardance is improved, the hydrophobicity of POP can be improved, and the viscosity of the composite material is reduced. The macromolecular nitrogen-containing dispersing agent forms a nitrogen-phosphorus-bromine ternary synergistic flame-retardant system by adopting a DMC catalytic process and a polyurethane synthesis technology, so that the flame retardance of POP is further improved.

Described herein is a porous article comprising: a nonwoven composite comprising oxidized polyacrylonitrile staple fibers and silica aerogel; wherein a coating is disposed on at least a portion of a surface of the nonwoven composite, wherein the coating is derived from an aminoalkoxy silane and wherein the porous article has a surface area of at least 1 m2 / g. Such porous articles may be used to sorb components of interest such as carbon dioxide.

The invention relates to the technical field of concrete, and particularly discloses geopolymer concrete and a preparation method thereof. The geopolymer concrete is prepared from the following raw materials in parts by weight: 60 to 80 parts of mineral powder, 30 to 40 parts of fly ash, 20 to 25 parts of silica fume, 45 to 55 parts of alkali activator, 150 to 180 parts of aggregate, 1.95 to 2.25 parts of toughening fiber and 40 to 50 parts of water, the toughening fiber is composite toughening agent modified polyvinyl alcohol / polyacrylonitrile composite fiber, and the length of the toughening fiber is 6 to 10 mm; in addition, the preparation method disclosed by the invention has the advantage of improving the brittleness of the geopolymer concrete.

The invention provides a nano plugging agent for shale drilling and a preparation method and application thereof, the nano plugging agent for shale drilling comprises the following preparation raw materials: silane coupling agent modified nano silicon dioxide, a polymeric monomer, an emulsifier and an initiator; the polymeric monomer is one or a combination of at least two of styrene, sodium p-styrenesulfonate, acrylic acid, acrylonitrile or methyl methacrylate. The nano plugging agent for shale drilling can effectively improve the plugging rate, has the characteristics of good dispersity and stability, difficulty in breaking, strong adaptability to the sizes and shapes of pores and cracks and the like, meets the plugging requirements of shale nano-scale cracks, efficiently reduces pressure transmission and filtrate invasion, and prevents well wall instability.

The invention relates to the technical field of polycarbonate ASA materials, and discloses an ASA composite material, a preparation method and application of the ASA composite material in an electric vehicle charging pile shell. Polycarbonate, ASA acrylonitrile-styrene-acrylate copolymer, poly (acrylonitrile-acrylate benzyl carbonate), an antioxidant and a processing aid are mixed and subjected to melt extrusion; the ASA composite material is obtained. Poly (acrylonitrile-acrylate benzyl carbonate) contains a carbonate group which is the same as that of polycarbonate, the polycarbonate and the poly (acrylonitrile-acrylate benzyl carbonate) have good compatibility, and contain polyacrylonitrile and polyacrylate block molecular chains, and the side chain contains a benzene ring structure which is similar to the structure of an ASA acrylonitrile-styrene-acrylate copolymer, so that the effect of compatibilizing the polycarbonate and the ASA is achieved; therefore, the material has higher impact strength, tensile strength and elongation at break.

The invention discloses a high-strength antibacterial polypropylene composite material and a preparation method thereof. The composite material comprises the following components in parts by weight: 100 parts of polypropylene, 15-25 parts of glass fiber, 1-8 parts of a compatilizer, 3-6 parts of unsaturated polyester, 1-5 parts of a stabilizer, 0.1-0.5 part of an initiator, 0.1-0.3 part of a metal ion antibacterial agent and 0.2-1.5 parts of an antioxidant, the stabilizer is selected from at least one of methyl methacrylate, acrylonitrile and divinyl benzene; the melting processing temperature of the polypropylene material is 160-175 DEG C. According to the invention, a micro-crosslinking structure is formed in the glass fiber reinforced polypropylene, so that the anisotropic shrinkage difference of the glass fiber reinforced polypropylene is effectively reduced, and the appearance quality defects caused by anisotropic characteristics of anisotropic shrinkage of the current glass fiber reinforced polypropylene material are reduced.

The application relates to a method for determining pre-oxidation process parameters of polyacrylonitrile-based carbon fibers, and belongs to the technical field of carbon fibers. The method for determining pre-oxidation process parameters of polyacrylonitrile-based carbon fibers comprises first-stage pre-oxidation, the first-stage pre-oxidation temperature is determined based on DSC of the original fiber, and the first-stage pre-oxidation time is determined based on a cyclization index of the fiber at the first-stage pre-oxidation temperature. More reasonable pre-oxidation parameters can be determined, and polyacrylonitrile-based carbon fibers with high strength and high modulus can be prepared.

The invention relates to the technical field of water-based binders, in particular to a preparation method of a high-flexibility positive electrode water-based binder and a product of the high-flexibility positive electrode water-based binder, and the preparation method at least comprises the following steps: dissolving acrylamide in deionized water, and sequentially adding carboxylic acid monomers, acrylonitrile and acrylate monomers to obtain a mixture A; heating the mixture A to 50-60 DEG C under the protection of inert gas, dropwise adding an initiator, filtering, and washing to obtain a solid precipitate; and adding a sodium hydroxide aqueous solution into the solid precipitate to obtain the high-flexibility positive aqueous binder. A polymerization precipitation process is adopted, the solid content of the mixture A is controlled to be 45-60 wt%, the reaction temperature is controlled to be 50-60 DEG C, and the synthesized water-based adhesive has good flexibility and peel strength while maintaining the viscosity of 5000-20000 mPa.s.