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The invention discloses a glycosyl transferase mutant for synthesizing rebaudioside M and a synthesis method of rebaudioside M, and belongs to the technical field of gene engineering. The glycosyl transferase mutant for synthesizing the rebaudioside M is a glycosyl transferase UGT76G4 mutant and / or a glycosyl transferase UGT91C1 mutant, and the glycosyl transferase mutant is a glycosyl transferase UGT76G4 mutant. The glycosyl transferase UGT76G4 mutant is obtained by mutation of an amino acid sequence as shown in SEQ ID NO: 1: 85th amino acid is mutated into R from L, and 90th amino acid is mutated into G from I; the glycosyltransferase UGT91C1 mutant is obtained by mutating an amino acid sequence shown in SEQ ID NO: 3 as follows: the 204th amino acid is mutated into A from L, the 208th amino acid is mutated into A from F, and the 380th amino acid is mutated into D from G. The mutant can realize efficient catalytic synthesis of rebaudioside M, and the yield of rebaudioside M synthesized by an enzymic method is improved.

The invention relates to the technical field of chemical degradation of waste polyester, and discloses a titanium-silicon compound catalyst, a preparation method thereof and a method for depolymerizing polyethylene glycol terephthalate. The preparation method of the titanium-silicon compound catalyst comprises the following steps: (1) preparing a titanium compound, an orthosilicate compound and a solvent, and reacting with an organic acid solution to obtain a solution; and (2) carrying out post-treatment on the solution to obtain the titanium-silicon compound catalyst. The catalyst has the characteristics of high PET depolymerization rate, low polymerization degree in a depolymerization product, high purity of a depolymerization product bis (2-hydroxyethyl) terephthalate (BHET) and low titanium residue in a target product in a PET degradation reaction. The BHET obtained by the method disclosed by the invention can be directly used for preparing PET polyester products or other high-added-value products, and closed-loop cyclic utilization of PET is realized.

The invention discloses an adsorption coupling contact precipitation defluorination system and a defluorination method, and the method comprises the following steps: feeding fluorine-containing mine water into a defluorination reaction tank, and carrying out adsorption defluorination on the fluorine-containing mine water through a defluorination filter material layer to obtain first defluorination mine water; feeding the calcium agent and the phosphorus agent according to the formula ratio into a fluorine removal reaction tank, removing fluorine through a catalytic reaction to obtain second fluorine-removed mine water, and then feeding the obtained second fluorine-removed mine water into a clean water tank; when the head loss of the second defluorination mine water exceeds a threshold value, feeding backwashing water and backwashing air into a defluorination reaction tank, and backwashing a filter material in a defluorination filter material layer; feeding the regenerated liquid into a defluorination reaction tank, soaking a defluorination filter material layer for 10-12 hours, and then discharging generated waste liquid into a lime reaction tank. According to the method disclosed by the invention, through adsorption, contact precipitation and regeneration, the carbon-based apatite adsorbed with fluorine ions in the defluorination reaction tank is used as a seed crystal for subsequent contact precipitation, so that the service time of a filter material in a defluorination filter material layer is effectively prolonged, and the regeneration frequency of the filter material is reduced.

The present invention discloses a method for preparing a lithium battery high energy density and fast charging graphite negative electrode material, comprising the following steps: mixing, briquetting, and graphitization. The modified graphene is evenly distributed in the graphite phase, and the two have good contact performance, which greatly enhances the conductivity of the graphite material and its coating layer. The amount of conductive agent added can be reduced in the manufacturing process, so that more active substances can be placed in a limited battery space, increasing the energy density of the battery; secondly, catalytic graphitization can increase the capacity of graphite to more than 360 mAh / g, further improving the energy density of the battery; the synergistic effect brought about by graphene modification and catalyst pore formation improves the fast charging performance, and graphene forms a rich conductive network between graphite and granulated coating layers, reducing system impedance and battery polarization, improving conductivity, and enhancing the rate characteristics of the battery. The catalyst volatilization will leave abundant pores, providing a convenient path for the diffusion of lithium ions, and improving the fast charging performance.

The invention relates to the technical field of chemical degradation of waste polyester, and discloses a titanium-rare earth compound catalyst which comprises a titanium-containing compound and a rare earth catalyst, wherein the titanium-containing compound is selected from at least one of dihydric alcohol modified alkyl titanate, alkyl titanate, dihydric alcohol titanium, titanium phosphate and organic-inorganic hybrid titanium; wherein the rare earth catalyst is selected from acetylacetone rare earth catalysts. The titanium-rare earth compound catalyst has the characteristics of high PET depolymerization rate, low polymerization degree in a depolymerization product, small catalyst dosage, high catalyst selectivity and high yield and purity of a depolymerization product bis (2-hydroxyethyl) terephthalate (BHET) in a degradation reaction of polyethylene glycol terephthalate (PET). The BHET obtained by the method disclosed by the invention can be directly used for preparing PET polyester products or other high-added-value products, and closed-loop cyclic utilization of PET is realized.

The invention discloses a negative electrode slurry cracking reduction method, which specifically comprises the following steps: S1, negative electrode slurry formula improvement: on the basis of original raw materials of negative electrode slurry: graphite, a conductive agent, a thickening agent, a binder and deionized water, adding a specific additive-N-methyl pyrrolidone accounting for 0.5% of the total weight of the raw materials; the invention relates to the technical field of battery manufacturing. According to the method for reducing the cracking of the negative electrode slurry, coating cracking is remarkably reduced: by adding NMP in a specific proportion, the problem of coating cracking of the negative electrode slurry is effectively improved, and the yield and quality of a negative electrode plate are improved; the cracking-free negative plate can maintain better structure and performance stability, and is beneficial to improving the overall performance and prolonging the service life of the lithium ion battery; the rejection rate and the rework rate caused by cracking are reduced, and the production cost and resource waste are reduced; nMP is used as a common solvent and is widely applied to the battery manufacturing industry.

The invention discloses a method for preparing an animal adipose tissue simulant by using soybean protein and application of the animal adipose tissue simulant, and belongs to the technical field of deep processing of vegetable protein. Soybean protein is used as a raw material, the soybean protein and polysaccharide are compounded and heated to form thermal induction gel, then microgel particles are obtained through mechanical shearing and crushing, and recombinant soybean protein emulsion gel, namely the animal adipose tissue simulant, is prepared through vegetable oil emulsification and glutamine transaminase covalent cross-linking. The fat-reducing sausage is used as a substitute of pig back fat and is applied to development of fat-reducing sausages. The animal adipose tissue simulant prepared by the invention has texture and melting characteristics similar to those of animal pig back fat. The invention provides the preparation method of the plant-based fat simulant, which meets the requirements of environmental protection and health and sustainable production, not only meets the requirements of texture and melting characteristics of solid fat, but also provides technical support for high-value application of soybean protein in the field of plant meat foods.

The invention relates to structural health monitoring intelligent concrete for airports and a preparation method thereof, and the method comprises the following steps: adding a polycarboxylic acid water reducing agent into water, and mixing to obtain a water reducing agent solution; adding carboxylated multi-walled carbon nanotubes, silica fume and fly ash into the water reducing agent solution, and mixing to obtain a carbon nanotube suspension; performing ultrasonic treatment on the carbon nanotube suspension to obtain a carbon nanotube dispersion liquid; and adding the carbon nanotube dispersion liquid into the dry material mixture, and mixing to obtain the structural health monitoring intelligent concrete for the airport. Compared with the prior art, the conductivity of the concrete can be effectively improved, so that the concrete has the function of monitoring structural health.

The invention relates to the technical field of lithium battery diaphragms, and discloses a water-soluble gel electrolyte, a preparation method thereof, water-based slurry and application. The preparation method of the water-soluble gel electrolyte comprises the following steps: in the presence of an initiator, carrying out first polymerization reaction on methyl methacrylate and N-isopropylacrylamide to obtain an intermediate I; carrying out second polymerization reaction on the polymer solution A and the polymer solution B to obtain an intermediate I; the polymer solution A contains an intermediate I with the concentration of 8-12wt%; the polymer solution B contains neopentyl glycol diglycidyl ether with the concentration of 0.5 to 1.2 weight percent; and carrying out heating treatment on the intermediate I to obtain the water-soluble gel electrolyte. When the water-soluble gel electrolyte is applied to the battery diaphragm, the addition amount of the electrolyte can be reduced during electrolyte injection in a battery cell, and the cost is effectively reduced; battery leakage is reduced, and the safety performance of the battery cell is improved; and the internal resistance can be reduced, and the cycle performance of the battery cell can be improved.

The invention discloses an ink-friendly BOPP (Biaxially-oriented Polypropylene) film as well as a preparation method and application thereof, and relates to the field of organic materials. The BOPP film comprises polypropylene A, white master batch and foaming master batch; the white master batch comprises polypropylene B, nuclear titanium dioxide, PE wax, a dispersing agent and a blue pigment. In the white master batch, the nuclear titanium dioxide is used for replacing titanium dioxide, so that the flowability of the master batch can be improved, the filter pressing value can be reduced, the pressure in front of a filter screen is small, the current load is low, the continuous film breaking time is delayed in the preparation process of the BOPP film, and the production smoothness is improved; the core titanium dioxide is not easy to agglomerate in a polypropylene system, so that the core titanium dioxide is uniformly dispersed, and due to the irregular structure that small balls coat large balls specific to the core titanium dioxide particles, porous gaps are formed in the BOPP film, the porosity is improved, the film density is obviously reduced, the addition amount of foaming master batches can be reduced, and the prepared BOPP film is high in surface roughness, high in ink adhesion and good in mechanical property. And the BOPP film is excellent in performance.

The invention belongs to the field of high polymer materials, and discloses a surface flame-retardant compatibilization glass fiber reinforced PPE / PS alloy material and a preparation method thereof, the alloy material comprises the following raw materials by weight: 10-84.98% of bulk flame-retardant MPPE resin; 5-35% of polystyrene resin; 10 to 40% of flame-retardant glass fiber; 0.01 to 10% of a flame retardant; 0.01 to 2% of a synergistic flame retardant; and 0-3% of other auxiliary agents. The prepared PPE / PS alloy material has excellent mechanical properties, processability and flame retardance, and can be used in the fields of household appliances, electric appliances, automobiles, optical fiber parts and the like.

The invention discloses a natural vegetable oil composition as well as a preparation method and application thereof. The natural vegetable oil composition comprises sunflower seed oil, simmondsia chinensis seed oil, grape seed oil and camellia seed oil. The feeding mass ratio of the sunflower seed oil to the simmondsia chinensis seed oil to the grape seed oil to the camellia seed oil is 1: (0.5-1.5): (0.5-1.5): (0.5-1.5); the components are uniformly mixed during preparation, practice shows that the combination of the four natural plant-derived oils has an excellent moisturizing effect and a skin repairing effect and has a remarkably better and more balanced effect compared with a single or partial combination of the four natural plant-derived oils, and particularly, the remarkable moisturizing and skin repairing effects can be obtained only by a small addition amount; the composition is beneficial to addition and use in cosmetics, does not need to adopt excessive emulsifiers for additional emulsification and dispersion, is beneficial to reduction of irritation brought by the emulsifiers, and is good in use experience.

The invention relates to the technical field of electric power engineering materials, in particular to a polypropylene-based semiconductive shielding material, a preparation method thereof and a cable. The polypropylene-based semiconductive shielding material provided by the invention is prepared from the following components in parts by weight: 34 to 63 parts of polypropylene resin, 7 to 28 parts of ethylene-propylene copolymer elastomer and 20 to 30 parts of conductive carbon black, wherein the crystallinity of the polypropylene resin is 30%-35%, and the melting point of the polypropylene resin is 155-160 DEG C; the mass percent of vinyl in the ethylene-propylene copolymer elastomer is 14%-18%; the carbon black oil absorption value of the conductive carbon black is 145 mL / 100 g to 150 mL / 100 g. In the polypropylene-based semi-conductive shielding material provided by the invention, the polypropylene resin and the ethylene-propylene copolymer elastomer have excellent compatibility, so that the use of the elastomer can be effectively reduced, and the polypropylene-based semi-conductive shielding material has the advantages of relatively low cost and excellent mechanical strength and electrical performance.

The invention discloses a method for preparing cellobiose and comprehensively utilizing a by-product of cellobiose. The method is characterized by specifically comprising the following steps: (1) dilution, (2) enzymolysis, (3) flocculation and carbon explosion, (4) decoloration, (5) continuous ion exchange, (6) evaporation and concentration, (7) simulated moving bed chromatographic separation, (8) concentration, (9) finished product preparation and (10) raffinate utilization. The method effectively solves the problems of low preparation purity and high production cost of cellobiose.

The invention provides an RNA polymerase variant and application thereof, and relates to the technical field of biology. Wild type T7 RNA polymerase is modified to obtain the T7 RNA polymerase variant, the enzyme specific activity of the T7 RNA polymerase variant is remarkably improved compared with that of the wild type T7 RNA polymerase, the addition amount of the polymerase in the in-vitro transcription reaction process can be reduced, and the cost is saved; in addition, the mutant also effectively reduces the generation of incomplete fragment impurities, and the mRNA integrity is significantly improved to 99%. The invention further provides a method for preparing RNA through in-vitro transcription.

The invention relates to the field of transparent flame-retardant modification of polycarbonate, in particular to a sulfonated polyborosiloxane flame retardant for transparent flame-retardant polycarbonate and a preparation method of the sulfonated polyborosiloxane flame retardant. The preparation method comprises the following steps: adding octamethylcyclotetrasiloxane, tetraethyl silicate, boric acid and a sulfonate compound into an organic solvent, adjusting the pH value to 2-5, and reacting to obtain the sulfonated polyborosiloxane flame retardant. The sulfonated polyborosiloxane provided by the invention is simple in preparation process and safe in process, and does not involve the use of halogen compounds. The sulfonated polyborosiloxane prepared by the method has the characteristics of good thermal stability, high carbon residue, self-extinguishing property and the like, and has an excellent effect of expanding to form carbon.

The invention discloses printing wastewater circulation separation treatment equipment which comprises a fixed water tank, a transmission plate and a discharge pipe, a separation box is installed at the top end of the fixed water tank, an aerostatic press is installed on one side of the bottom of the separation box, the transmission plate is movably clamped in the separation box and located over the aerostatic press, and a positioning plate is installed at one end of the transmission plate; the positioning plate is made of a plastic material, a plurality of rectangular grooves are formed in the positioning plate, separation frames are installed in the rectangular grooves and used for separating suspended solid impurities, and the discharging pipe is installed at the bottom end of the fixed water tank, is in a bent shape and is connected with an external conveying pipe; compared with the prior art, after separation is completed, internal sewage can be rapidly discharged, whether the sewage reaches a reasonable standard or not can be determined according to the amount of precipitates and dirt adsorbed on the interception sheet before a large amount of sewage is discharged for 10-30 seconds, and simple detection can be carried out.

The invention discloses a production method of nano-silicon composite fireproof glass, which comprises the following steps: compounding amino nano-silicon dioxide with a modified zinc-aluminum flame retardant to prepare a coated silicon-based filler, and compounding the coated silicon-based filler with nickel-titanium bimetal MOF to obtain a composite silicon-based flame-retardant filler; the preparation method comprises the following steps: mixing a mixed solution of silica sol, water-soluble silicone oil, a composite silicon-based flame-retardant filler, potassium hydroxide and sodium hydroxide with ethylene glycol, filling laminated glass with the mixed solution, and sealing and curing to obtain the nano-silicon composite fireproof glass. The nano-silicon composite fireproof glass has high light transmittance and high fire resistance, the zinc-aluminum flame retardant and the nickel-titanium bimetal MOF which have flame retardance are compounded on the nano-silicon dioxide to obtain a composite silicon-based flame-retardant filler, and the zinc-aluminum flame retardant and the nickel-titanium bimetal MOF generate a synergistic effect through compounding of a multi-layer core-shell structure, so that the flame-retardant performance of the nano-silicon composite fireproof glass is improved, and the flame-retardant performance of the nano-silicon composite fireproof glass is improved. The flame-retardant and fire-resistant performance of the composite silicon-based flame-retardant filler is improved, and the influence of the flame retardant on the light transmission of the nano-silicon composite fireproof glass is reduced.

The invention relates to the field of material technology, and discloses a low-density high-flame-retardant EPDM rubber composite material and a preparation method thereof. The invention can greatly improve the flame retardant performance of the EPDM rubber composite material by preparing a synergistic flame retardant with a special structure and cooperating with an inorganic flame retardant. The invention also solves the problem that the vulcanization speed of the EPDM rubber-plastic foaming is difficult to match with the foaming speed by controlling the type and amount of the vulcanizing agent. The prepared composite material has a low foaming density and fine pores.

The invention relates to the field of antistatic PVC (polyvinyl chloride) materials, in particular to a preparation method, a product and application of an antistatic pre-dispersion for a PVC film. The antistatic pre-dispersion for the PVC film is prepared by preparing an antistatic agent from an aminated ionic liquid-CNT compound and carboxylated Mxene, and mixing the antistatic agent with a plasticizer, an auxiliary dispersant and a hyperbranched flow improver. PVC resin and the like can be further combined to prepare a coating, and the coating and base cloth are prepared into a PVC film structure material to serve as an antistatic PVC material. The antistatic pre-dispersion prepared by the invention has good dispersibility in PVC resin, is slightly influenced by environmental temperature / humidity, and has a lasting antistatic effect. Meanwhile, the PVC film structure material prepared by using the antistatic pre-dispersion disclosed by the invention is good in wear resistance, not easy to migrate, stable in performance and relatively long in service life.

The invention provides a phase-change composite aerogel material for photothermal conversion and high-density heat storage. The phase-change composite aerogel material takes MXene / CNTs modified aerogel as a three-dimensional porous continuous supporting framework and takes a phase-change material as a filling material; wherein the phase change composite aerogel material is prepared from the following components in percentage by mass: 3.0 to 4.4 percent of MXene / CNTs modified aerogel and 95.6 to 97.0 percent of a phase change material according to 100 percent of mass percent. The invention also provides a preparation method of the phase change composite aerogel material. The MXenes / CNTs modified aerogel composite phase change material prepared by the preparation method disclosed by the invention is in a micron level, MXenes and CNTs are attached to the surface and the interior of the MXenes / CNTs modified aerogel composite phase change material, and the MXenes / CNTs modified aerogel composite phase change material is large in heat transfer area, good in heat transfer performance and mechanical performance and wide in application range; the preparation method is simple, and the reaction time and reaction conditions are easy to control. The invention also provides application of the phase-change composite aerogel material in solar photothermal conversion and heat storage materials.

The invention discloses an intrinsic flame-retardant antioxidant cross-linked polyolefin composite material and a preparation method thereof. The composite material is prepared from the following raw materials in parts by mass: 34-80 parts of polyolefin, 10-40 parts of flame-retardant unit side group grafted polyethylene, 16-28 parts of a halogen-free flame retardant and 1-2.5 parts of a cross-linking agent. According to the intrinsic flame-retardant antioxidant cross-linked polyolefin composite material, the flame-retardant unit side group grafted polyethylene is hydrolyzed and grafted with different flame-retardant structural units through polyethylene vinyl acetate, so that not only can the physical properties of polyolefin be improved, but also the flame-retardant property and the flame-retardant level of polyolefin can be improved. Besides, the intrinsic flame-retardant antioxidant cross-linked polyolefin composite material provided by the invention still has excellent anti-aging performance under the condition that no antioxidant is added, can achieve excellent flame-retardant and anti-aging effects when being used for preparing materials such as cables and rubber, and can be applied to the fields of buildings, traffic, chemical engineering, machinery, communication, energy and the like.

The invention provides primary amino modified solution polymerized styrene-butadiene rubber and a preparation method thereof. The preparation method comprises the following steps: in a polymerization system, initiating polymerization of a butadiene monomer and a styrene monomer by taking n-butyllithium as an initiator and tetrahydrofuran as a polymerization activator to obtain a styrene butadiene rubber active chain; adding a diisocyanate compound into the polymerization system to terminate polymerization, and introducing an isocyanate group to the end part of a styrene butadiene rubber active chain to obtain a styrene butadiene rubber solution; and adding a terminator into the styrene-butadiene rubber solution, stirring, separating out precipitate, and drying to obtain the primary amino modified solution polymerized styrene-butadiene rubber. The primary amino modified solution polymerized styrene-butadiene rubber is prepared by the preparation method, has high polarity and strong binding force with silicon dioxide filler, promotes generation of a more stable filler-polymer network with a more perfect structure, and remarkably improves the dynamic performance of a rubber material.

The invention discloses a room-temperature-cured high-strength high-thermal-conductivity and high-electric-conductivity silver adhesive which is characterized by comprising the following components in parts by weight: 100 parts of hydroxyl-terminated polydimethylsiloxane, 2-6 parts of carbon nanotubes, 200-450 parts of conductive particles, 1-5 parts of a silane coupling agent, 5-12 parts of a cross-linking agent and 0.5-5 parts of a catalyst. The invention further discloses a preparation method of the room-temperature-curing high-strength high-thermal-conductivity and high-electric-conductivity silver adhesive. The room-temperature-cured high-strength high-thermal-conductivity and high-electrical-conductivity silver adhesive has the advantages of short curing time, low volume resistivity, high bonding strength and good electrical conductivity. The product is tested after being placed in an outdoor environment for 12 months for a long time, the volume resistivity and the bonding strength of the conductive silver adhesive disclosed by the invention are hardly influenced, and the conductive silver adhesive shows excellent weather resistance; the product has high stability and can be used for a long time.

The invention provides a preparation method of a composite soft capsule shell containing plant starch, and belongs to the technical field of soft capsules. The composite soft capsule shell is prepared from the following components in percentage by mass: 15 to 30 percent of gelatin, 5 to 20 percent of modified plant starch, 1 to 15 percent of composite plant gum, 1 to 10 percent of dopamine grafted pulullan, 10 to 30 percent of plasticizer and 25 to 45 percent of solvent; compared with the existing soft capsule skin, the soft capsule skin prepared by the invention has better mechanical strength and toughness, overcomes the problem of disintegration and delayed release caused by a capsule shell crosslinking aging reaction, is beneficial to the preservation of the soft capsule and reduces the storage cost.

The invention relates to the technical field of flame-retardant materials, in particular to a vanillin-derived nitrogen-phosphorus synergistic flame retardant as well as a preparation method and application thereof. The preparation method comprises the following steps: carrying out aldehyde-amine condensation reaction on vanillin and p-phenylenediamine to generate a Schiff base intermediate with a characteristic group-C = N-; and carrying out addition reaction on the intermediate and reactive hydrogen connected with a phosphorus atom on 9, 10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, so as to obtain the vanillin-derived nitrogen-phosphorus synergistic flame retardant. The flame retardant obviously improves the flame retardant grade of the high polymer material under the condition of lower addition amount, does not release toxic and harmful gases in the combustion process, and meets the requirements of greenness and environmental protection. The flame retardant has good compatibility with high polymer materials such as thermoplastic polyurethane and the like. The preparation method of the flame retardant is controllable in reaction process, large-scale production is easy to realize, an innovative and feasible solution is provided for flame retardance of high polymer materials, and the flame retardant is expected to be widely applied to the fields of electronics, automobiles, buildings and the like.

The invention belongs to the technical field of amino acid production, and discloses a method for reducing the content of potassium ions in a culture medium, which comprises the following steps: dividing a fermentation culture medium for producing glutamic acid by microorganisms into a fermentation culture medium A and a fermentation culture medium B, and maintaining the content of potassium ions in the fermentation culture medium A to be 50% or less of that in the fermentation culture medium B. By optimizing the addition amount of potassium ions in the non-fermentation stage, the glutamic acid production rate is increased, and the fermentation period is shortened.

The invention belongs to the field of personal care, and particularly relates to a glycoside derivative flexible liposome and a preparation method and application thereof, the glycoside derivative flexible liposome comprises a main shell material, a humectant, a wrapped raw material, an auxiliary shell material, a preservative and a solvent; the main shell material is phosphatidylcholine, and the auxiliary shell material is polyquaternium-51; the preservative is any one or more of 1, 2-hexanediol, p-hydroxyacetophenone, methylparaben, phenoxyethanol and caprylyl glycol; the moisturizing agent is butanediol; the wrapped raw material is hydroxypropyl tetrahydrofurantriol; the solvent is deionized water. According to the invention, the permeability and penetration depth of the glassine and the concentration of the glassine at a target position are improved by utilizing a flexible liposome wrapping technology, the bioavailability of the glassine is improved, and the addition amount is reduced under the condition of realizing the same tightening and anti-wrinkle effects, so that the cost is reduced.

The invention belongs to the technical field of superfine powder preparation and lithium battery materials, and particularly relates to monoclinic-phase zirconium oxide nano powder as well as a preparation method and application thereof. The preparation method comprises the following steps: adding zirconium oxychloride octahydrate into water for dissolving to obtain a zirconium oxychloride aqueous solution, then putting the zirconium oxychloride aqueous solution into a hydrothermal reaction kettle, heating to 140-160 DEG C for hydrothermal reaction, cooling to room temperature after the reaction is completed, and standing for precipitation; then adding ammonia water to carry out ammonolysis reaction, standing and aging, completely precipitating residual zirconium ions, separating the precipitate, washing and drying to obtain a zirconium hydroxide precursor; and finally, carrying out heat preservation calcination treatment at 850-950 DEG C in an air environment to obtain the monoclinic phase zirconium oxide nano powder. The preparation method is simple in preparation process, and toxic and harmful substances are not introduced. The obtained nano ZrO2 powder has the advantages of accurate chemical composition, small powder particle size and low Cl <-> content, and meets the specification requirements of lithium battery positive electrode material additives.

The invention belongs to the technical field of polymer composite materials, and particularly relates to a PC / ABS composite material with high heat resistance and flame retardance as well as a preparation method and application of the PC / ABS composite material. The PC / ABS composite material is prepared from the following components in percentage by mass: 80 to 95 parts of polycarbonate resin, 5 to 20 parts of acrylonitrile-butadiene-styrene copolymer resin, 4 to 16 parts of a phosphorus flame retardant, 0.1 to 0.5 part of a sulfonate flame retardant, 2 to 8 parts of a compatilizer and 0.1 to 1 part of an antioxidant. According to the invention, sulfonate is compounded to synergistically generate BDP flame-retardant PC / ABS, so that the heat resistance of the material is remarkably improved, and the material shows excellent performance in the PC / ABS material. The heat stability and the mechanical performance of the material are remarkably improved through the optimized component proportion, and the material is suitable for application occasions with high flame retardance, low smoke and low toxicity, especially for products exposed outdoors for a long time such as new energy automobile charging piles.