4339 results about "Carboxymethyl cellulose" patented technology

The invention relates to the technical field of nano ceramic materials, and discloses a high-strength nano aluminum oxide ceramic product and a preparation process thereof.The preparation process comprises the following preparation steps that aluminum oxide powder, a composite binder, composite gel, a plasticizer and a solvent are mixed and subjected to ball milling, and composite slurry is obtained; placing the composite slurry in a mold, and performing mold pressing and drying to obtain a green body; and putting the green body into a high-temperature sintering furnace, carrying out high-temperature sintering, and cooling to room temperature to obtain the nano aluminum oxide ceramic product. Nano zirconium oxide and nano magnesium oxide are formed on the surfaces of the pretreated silicon carbide whiskers, and can form a solid solution with nano aluminum oxide in the sintering process to serve as a bridge of the silicon carbide whiskers and nano aluminum oxide particles, so that the binding force of the silicon carbide whiskers in a nano aluminum oxide ceramic matrix is remarkably enhanced; phosphoric acid and aluminum ammonium sulfate are firmly combined on the surfaces of nanometer aluminum oxide particles through carboxymethyl cellulose, and the situation that phosphoric acid and aluminum ammonium sulfate are not firmly combined with the nanometer aluminum oxide particles is avoided.

The invention discloses a bacillus subtilis microbial agent for promoting decay of corn straws and application of the bacillus subtilis microbial agent, the preservation date of bacillus subtilis K15 is May 21, 2024, the preservation unit is China General Microbiological Culture Collection Center (CGMCC), and the preservation number is CGMCC No.30716. The bacillus subtilis K15 has the advantages that the preservation number is CGMCC No.30716; the bacillus subtilis K15 is screened from soil in North China Plain, tests prove that the strain produces carboxymethyl cellulase, decomposition of corn straw can be effectively promoted, the decomposed straw provides a fertilizer source for wheat growth, growth of wheat plants and root systems is promoted, and the wheat yield is effectively increased. According to the invention, the function of the bacillus subtilis in straw decay promotion under the winter low-temperature condition in North China Plain is excavated, and a new strain resource is provided for a microbial fertilizer.

The invention provides sulfonated cellulose. The sulfonated cellulose is obtained by etherifying alkalized cellulose with water-soluble halogenated sulfonate. Compared with the prior art, the sulfonated cellulose provided by the invention contains sulfonic acid groups, hydroxyl groups and other groups, so that when the sulfonated cellulose is used in the drilling fluid, the filter loss of the drilling fluid can be effectively controlled, and meanwhile, the salt pollution resistance, especially the calcium ion pollution resistance, of the drilling fluid can be improved; in addition, sulfonic groups in the product are also beneficial to improving the thermal stability of the drilling fluid, and the application range is expanded. In a word, compared with carboxymethyl cellulose for drilling fluid, sulfonated cellulose provided by the invention has obvious temperature resistance and high-valence metal ion resistance.

The invention discloses an absorbable suture line for surgical suture and a preparation method thereof, and relates to the technical field of medical materials. The absorbable suture line for surgical suture is prepared from the following raw materials in parts by weight: 50 to 65 parts of polylactic acid, 15 to 20 parts of polyglycolic acid, 3 to 5 parts of sodium carboxymethyl cellulose, 3 to 8 parts of a toughening agent, 3 to 6 parts of an antibacterial agent, 0.3 to 0.8 part of a lubricating agent, 1 to 2 parts of sodium hyaluronate and 5 to 10 parts of polyvinyl alcohol. The toughening agent is obtained by reacting hydroxyethyl acrylate with ethylenediamine to generate a four-arm compound and then reacting with 6-caprolactone and DL-lactide. The absorbable suture line for surgical suture prepared by the invention has excellent tensile property and antibacterial property, and can meet the application requirements of clinical medical treatment.

The invention provides a thick electrode and a preparation method thereof, and a lithium battery, the thick electrode comprises a current collector and an active coating, the active coating comprises an active material, a conductive agent, a dispersant and a composite binder, the composite binder comprises a binder A and a binder B, the binder A comprises at least two of sodium carboxymethyl cellulose, a polyacrylic acid binder and an acrylonitrile multipolymer, and the binder B comprises at least one of polytetrafluoroethylene and butadiene styrene rubber. The thick electrode has the characteristics of stable structure, good conductivity and high ion transmission efficiency, and the cycling stability of the battery using the thick electrode can be improved.

The invention discloses an environment-friendly slow release fertilizer and a preparation method thereof, and belongs to the technical field of fertilizer mixture preparation. The preparation method comprises the following steps: mixing and stirring a mussel extract-polysaccharide-nitrogen fertilizer complex, an inorganic fertilizer and water according to a weight part ratio of (1-2): (5-7): (15-23), heating to 50-60 DEG C to form a dispersion solution, mixing and stirring the dispersion solution and a calcium salt according to a weight part ratio of 1: (0.005-0.01), cooling to 20-25 DEG C, and reacting for 20-24 hours to obtain a viscous mixture; and drying, dewatering and crushing the viscous mixture to obtain the environment-friendly slow-release fertilizer. According to the environment-friendly slow-release fertilizer, the mussel extract with a good adhesion effect and the carboxymethyl cellulose or the hyaluronic acid with biocompatibility are used as carriers, through the synergistic cooperation of an amide structure, an imine structure and metal coordination, wrapping of a nitrogen fertilizer and an inorganic fertilizer is achieved, and finally the environment-friendly slow-release fertilizer is obtained.

The invention relates to the technical field of microorganisms, in particular to bacillus velezensis F0b and an application of the bacillus velezensis F0b. The bacillus velezensis F0b is preserved in the Guangdong Microbial Culture Collection Center on April 26, 2024, the preservation date of the bacillus velezensis F0b is April 26, 2024, and the preservation number of the bacillus velezensis F0b is GDMCC (China General Microbiological Culture Collection Center): 64566. The bacillus velezensis has prevention and / or control effects on pyricularia oryzae, cabbage sclerotinia sclerotiorum, tomato fusarium wilt, banana fusarium wilt, rice leaf spot, peronophythora litchii, soybean carbon rot, colletotrichum capsici and corn leaf curvularia, and can be used for preparing broad-spectrum microbial source bactericides. The fermentation liquor of the bacillus velezensis can generate amylase, carboxymethyl cellulose and protease, and the fermentation liquor of the bacillus velezensis has prevention and / or control effects on vegetable pathogenic fungal diseases, namely cabbage sclerotiniose or pepper anthracnose.

The invention relates to the technical field of sole processing, in particular to a sole composite processing method, which comprises the following steps: according to the rigidity requirement of an arch support area, preparing high-density slurry in which silicon nitride ceramic powder accounts for 30-40%, forming # imgabs0 # crystal phase through microwave-assisted sintering, and controlling the porosity to be 10-20%; according to the energy rebound requirement of the forefoot buffer area, graphene oxide / carboxymethyl cellulose aerogel powder is added into the slurry until the concentration is 25%, and the porosity is increased to 40-60% by combining the honeycomb porous network design; a nano silicon dioxide reinforcing agent is introduced into a wear-resistant area of the heel to 15%, a diamond-like carbon coating is formed through plasma surface treatment, and the porosity is limited to be 5-15%. According to the invention, silane is encapsulated by adopting polyurea microcapsules, and is released only when the material is damaged, so that dynamic self-repairing is realized, the shoe sole is endowed with dynamic repairing capability, and the service life is prolonged.

The invention discloses an oral care desensitization paste and a preparation method thereof, and mainly relates to the technical field of dental medicines. The oral care desensitization cream is prepared from the following components: bioactive glass, strontium chloride, sodium chloride, silicon dioxide, sodium carboxymethyl cellulose, polyethylene glycol 400, a xanthan gum solution, sodium lauryl sulfate, sodium lauroyl sarcosinate, titanium dioxide, beta-glucan, saccharin sodium salt, sorbitol, methylparaben, propyl hydroxybenzoate, edible essence and water. Compared with the prior art, the oral care desensitization paste disclosed by the invention can be used for sealing dentinal tubules and treating hemodia; the traditional Chinese medicine composition can also be used for treating plaque gingivitis, relieving and reducing gingival bleeding and inhibiting and reducing dental plaque; and meanwhile, the condition of mistakenly swallowing and eating in the using process is reduced.

The invention discloses a lithium salt doped porous carbon coated graphite composite material for an energy storage battery and a preparation method thereof, the composite material has a core-shell structure, the core is graphite, and the shell is a lithium salt doped porous carbon complex. The preparation method comprises the following steps: uniformly mixing amino resin, a pore-forming agent and a heteroatom compound of the pore-forming agent, curing, activating to obtain porous carbon, adding the porous carbon into an inorganic lithium salt, uniformly mixing, and carrying out spray drying to obtain lithium salt doped porous carbon; the preparation method comprises the following steps: adding lithium salt doped porous carbon into a carboxymethyl cellulose lithium solution, uniformly dispersing, then adding into a graphite material, uniformly dispersing, spray-drying, and carbonizing to obtain the lithium salt doped porous carbon coated graphite composite material. According to the obtained material, the coating layer lithium salt is doped with porous carbon, so that the liquid absorption and retention capacity of the material is improved, the diffusion rate of lithium ions is increased, and the rate capability is improved; meanwhile, the expansion of the composite material in the charging and discharging process is reduced by utilizing the low expansion of the porous carbon, and the cycle performance is improved.

The invention relates to the field of batteries, and discloses electrode slurry, a preparation method thereof, an electrode plate, a battery and an electric device. The electrode slurry comprises an electrode active material, a conductive agent, a binder, a plasticizer and a solvent, the binder comprises CMC (Carboxymethyl Cellulose), SBR (Styrene Butadiene Rubber) and a water-based binder, the water-based binder is an acrylic copolymer binder, and the SBR is a styrene, butadiene and acrylonitrile copolymer binder. The CMC, the SBR and the specific water-based copolymer binder are combined and applied to the electrode slurry, through matching with other components such as an active material and the like, the processing performance of the electrode slurry can be remarkably improved, for example, smooth sieving of the slurry, improvement of binding power, reduction of pole piece rebound and the like can be achieved, and meanwhile compared with slurry adopting a commercial binder, the service life of the electrode slurry is prolonged, and the service life of the electrode slurry is prolonged. And the long cycle performance of the battery can be improved, and the requirement of a high-performance battery can be further met.

The invention relates to a preparation method of a high-hardness and high-sulfate-radical water quality scale inhibitor, and belongs to the technical field of water treatment.The preparation method comprises the steps that sodium carboxymethyl cellulose-sulfur quantum dots are prepared by using carboxymethyl cellulose as a stabilizer and then subjected to a copolymerization reaction with 2-acrylamido-2-methylpropanesulfonic acid and itaconic acid, and the high-hardness and high-sulfate-radical water quality scale inhibitor is obtained. The preparation method comprises the following steps: carrying out a reaction on sodium carboxymethyl cellulose and sulfur quantum dots to obtain modified sodium carboxymethyl cellulose-sulfur quantum dots, and carrying out a reaction on polysuccinimide, 4-amino phthalic acid and 2-aminoethanesulfonic acid to obtain a polyaspartic acid derivative; the modified sodium carboxymethyl cellulose-sulfur quantum dots and the polyaspartic acid derivative are mixed to serve as the scale inhibitor, the scale inhibition rate of the scale inhibitor is remarkably increased through the synergistic effect of the modified sodium carboxymethyl cellulose-sulfur quantum dots and the polyaspartic acid derivative, and meanwhile, due to the fact that a large number of new hydrogen bonds are generated between the modified sodium carboxymethyl cellulose-sulfur quantum dots and the polyaspartic acid derivative, the scale inhibition rate of the scale inhibitor is increased. The stability of a polymer structure is improved, so that the temperature resistance of the scale inhibitor is improved. The scale inhibitor is green and environment-friendly, and has excellent scale inhibition efficiency on high-hardness and high-sulfate-radical water.

The invention discloses injectable hydrogel for eye drug sustained release and a preparation method and application thereof.The method comprises the steps that a NaIO4 solution is dropwise added into a hyaluronic acid solution, after the reaction is conducted in a dark place at the room temperature, ethylene glycol is added for continuous reaction, and formylated hyaluronic acid is prepared; the preparation method comprises the following steps: adding adipic dihydrazide into a carboxymethyl cellulose solution, uniformly stirring at room temperature, adding 1-hydroxybenzotriazole and 1-ethyl-(3-dimethylaminopropyl) carbodiimide hydrochloride, and stirring to react, so as to prepare aminated carboxymethyl cellulose; and mixing the PBS solution of aminated carboxymethyl cellulose with the PBS solution of formylated hyaluronic acid, uniformly stirring, adding a to-be-carried drug and a FeCl3 solution, and carrying out a reaction to prepare the injectable hydrogel for sustained release of the eye drug. The hydrogel is convenient to use and high in gelation rate, effectively realizes controllable release of drugs, and has a wide application prospect in the field of biological medicines.

The invention discloses a method for realizing pure pore size regulation and control of a silicon carbide ceramic membrane, which comprises the following steps of: a) adding silicon carbide, sodium carboxymethyl cellulose and a dispersing agent into water, and uniformly ball-milling to obtain spraying slurry; and b) spraying the spraying slurry to the surface of a silicon carbide ceramic membrane to be regulated and controlled, naturally airing, carrying out vacuum drying at 75-85 DEG C for 2-5 hours, putting into a high-temperature furnace, carrying out vacuum sintering at 800-1200 DEG C for 1-3 hours, putting into a muffle furnace, and carrying out oxidation sintering at 700-900 DEG C for 25-45 minutes. According to the method, the pore size of the silicon carbide ceramic membrane can be subjected to pure regulation and control, operation is easy, cost is low, large-scale production is easy to achieve, the influence on the thickness of an original membrane is small, the membrane layer firmness is good, the filter flux of pure water is still high, and the application value of the silicon carbide ceramic membrane in water treatment is remarkably improved.

The invention relates to green low-carbon functional inorganic rock coating artistic effect paint and a preparation method thereof, and belongs to the technical field of paint. The waterborne epoxy resin emulsion is modified, the aminated calcium carbonate and the modified carboxymethyl cellulose are introduced, and multiple components act together, so that the adhesion level is effectively improved, and good salt fog resistance and aging resistance are obtained.

The present invention relates to a barrier paper comprising a paper substrate and a carboxymethyl cellulose coating layer formed on a surface of the paper substrate, in which the paper substrate is cellulose paper, and the carboxymethyl cellulose coating layer comprises 80 wt% to 100 wt% of carboxymethyl cellulose based on dry weight.

The invention provides a dump leaching method for improving the leaching rate of gold ore, and belongs to the technical field of mineral processing. The method comprises the following steps: firstly, separating minerals into oversize products and undersize products; mixing sodium carboxymethyl cellulose, bentonite and ferrous sulfate to obtain a mixture, and granulating the undersize product by using the mixture as a binder; and mixing the undersize product particles with the oversize product, and carrying out cyanide-free dump leaching. According to the method, through graded granulation and heap building, the problem that heap building permeability is poor due to the fact that the gold ore contains many clay minerals is solved. In the granulation stage, ferrous hydroxide colloid generated by hydrolysis of ferrous sulfate in the binder can assist ore particle agglomeration, and particle stability is enhanced; during subsequent cyanide-free dump leaching, ferrous sulfate can be used as an auxiliary reducing agent and a catalyst in a thiourea gold leaching system to promote oxidation and dissolution of gold; meanwhile, ferrous ions can adjust the oxidation-reduction potential of a system, so that the thiourea gold leaching reaction is in a more favorable potential interval, the oxidation efficiency of thiourea is improved, invalid decomposition of thiourea is reduced, and therefore the use amount of thiourea and the use amount of agents are reduced.

The invention discloses light self-repairing concrete and a preparation method thereof, and relates to the technical field of concrete. The method comprises the following steps: firstly, efficiently packaging a calcium nitrate solution in hollow glass beads by utilizing a negative pressure impregnation technology; then growing a porous zeolite crystal coating on the surface of the microbead in situ by adopting a sol-gel method to form a self-repairing filler with a core-shell-hole gradient structure; when the concrete cracks to cause the cracking of the microbeads, the Ca < 2 + > in the cavity is quickly released, and the Ca < 2 + > adsorbed in the zeolite layer is gradually dissociated along with water permeation, so that the new microcracks are continuously repaired. Then, uniformly coating the surface and pores of the carboxymethyl cellulose hydrogel network with polydopamine in an in-situ oxidative polymerization manner to form composite hydrogel with photo-thermal responsiveness; lighting and heating to trigger dynamic coordination bond dissociation; meanwhile, heat drives rapid directional crystallization of a repair product by promoting the ion diffusion rate, and a compact mineralization layer is formed. The concrete prepared by the invention has the effects of light weight and self-repairing.

The invention relates to the technical field of medical dressings, in particular to a perianal drug dressing of a multi-layer flow guide composite fabric and a preparation method and application of the perianal drug dressing of the multi-layer flow guide composite fabric. The perianal drug dressing is of a four-layer structure, a wet tissue adhesion layer is made of polydopamine modified chitosan / oxidized hyaluronic acid hydrogel, and wet-state adhesion is achieved; the drug sustained-release layer is used for dispersing mesoporous silica loaded with ciprofloxacin hydrochloride / defensin and chitosan microspheres loaded with epidermal growth factors / lonicera japonica into a polycaprolactone fiber membrane to achieve synergistic antibacterial and healing promotion; the directional flow guide layer is of a gradient wettability sandwich structure with a bionic micro-channel, and one-way rapid drainage can be achieved; the high-absorption outer layer is carboxymethyl cellulose / sodium polyacrylate composite sponge, liquid is locked efficiently, the wound surface is kept dry and comfortable, the clinical problem in perianal infection wound treatment can be effectively solved, and the treatment effect and the patient comfort are remarkably improved.

The invention belongs to the technical field of intelligent high polymer materials, and particularly relates to a preparation method of a quick temperature-sensitive response poly (N-isopropylacrylamide) (PNIPAM)-polyacrylamide (PAM) composite hydrogel. The method comprises the following steps: firstly, copolymerizing carboxymethyl cellulose and N-isopropylacrylamide to obtain a graft polymer, and then reacting the graft polymer with acrylamide to obtain the CMC-PNIPAM-PAM composite hydrogel. The preparation method is low in raw material price and simple and feasible in technological process; the prepared material is rapid in response to temperature change, and the hydrogel is rapidly and reversibly changed from transparent to opaque in the heating process. Besides, by changing the temperature condition in the hydrogel preparation process, the size stability of the hydrogel in the temperature response process can be changed, two kinds of hydrogel with large performance difference are obtained, potential application risks caused by performance failure and structure instability of a gel device in different application environments are avoided, and the application performance of the gel is further improved.

The invention discloses an ultraviolet barrier film as well as a preparation method and application thereof. The ultraviolet barrier film is prepared from the following raw materials in percentage by weight: 20-40% of polyvinyl alcohol; 20%-30% of sodium carboxymethyl cellulose; 5%-10% of carbon quantum dots; and 30%-45% of water chestnut starch. The preparation method of the ultraviolet barrier film comprises the following steps: 1) preparing a polyvinyl alcohol solution, a sodium carboxymethyl cellulose solution, a carbon quantum dot dispersion liquid and a water chestnut starch solution; 2) preparing gelatinized mixed slurry; and 3) carrying out film casting on the gelatinized mixed slurry, and drying to obtain the ultraviolet barrier film. The ultraviolet barrier film has the advantages of being excellent in ultraviolet barrier performance, good in moisture barrier performance, high in mechanical strength, high in transparency, environmentally friendly, degradable and the like, can be used as a packaging material, and is simple in preparation method, low in production cost and suitable for large-scale industrial production and application.

The invention relates to the technical field of ceramic materials, and provides a multilayer ceramic substrate and a preparation method thereof, the multilayer ceramic substrate comprises the following raw materials by weight: 100 parts of alumina, 2-3 parts of a flexibilizer, 3-6 parts of a sintering aid, 2-3 parts of a dispersant, 4-8 parts of a binder, 0.5-1 part of an aid, 4-6 parts of polyvinyl alcohol, and 30-35 parts of a solvent; the auxiliary agent is prepared from calcium carboxymethyl cellulose and calcium 2, 5-dihydroxybenzenesulfonate in a weight ratio of 1: (1-3). According to the technical scheme, the problem of poor bending strength of the ceramic substrate in the prior art is solved.

The invention discloses a preparation method of a colorimetric sensing array capable of intelligently detecting meat freshness, and belongs to the technical field of meat freshness intelligent detection systems. The preparation method of the colorimetric sensor array comprises the following steps: dissolving carboxymethyl cellulose in water to prepare an aqueous solution, then adding anthocyanin, then dividing the solution into N equal parts, taking 1 part as a blank, and respectively adding the rest N-1 parts into corresponding ionic liquids to form anthocyanin solutions with different color gamuts; the preparation method comprises the following steps: respectively casting in a culture dish, drying, uncovering a film, carrying out hydrophobic coating on the film by using a hydrophobic coating, drying, cutting into wafers with the same scale by using a puncher, and fixing in a pore plate to obtain the colorimetric sensor array. The colorimetric sensing array has the advantages of portability, visualization, no damage, stability, biodegradability, simplicity in preparation and operation, reusability and the like, can monitor and predict the freshness of meat in real time, and can solve the problems and defects of a traditional detection method.

The invention discloses a microporous breathable fabric as well as a preparation method and application thereof, and relates to the technical field of fabric treatment. The invention discloses a preparation method of a microporous breathable fabric, which comprises the following steps: coating the surface of a base cloth with a polyurethane coating agent, and drying to obtain the microporous breathable fabric, the polyurethane coating agent is prepared from the following raw materials in parts by weight: 100 parts of organic silicon modified polyurethane emulsion, 8 to 11 parts of N, N-dimethylacetamide, 2 to 2.5 parts of n-caprylic alcohol, 5 to 8 parts of a foam homogenizing agent and 1 to 3 parts of a thickening agent PTF; the organic silicon modified polyurethane emulsion is obtained by crosslinking polyurethane with carboxymethyl cellulose through silica sol; the polyurethane coating agent prepared by taking the organic silicon modified polyurethane emulsion as the base material is coated on the surface of the base cloth, so that the fabric has high waterproof performance and also has high air permeability and moisture permeability; the microporous breathable fabric prepared by the invention is applied to the field of outdoor sportswear, and comfortable wearing experience is provided.

The invention provides a slow-release antibacterial enhanced composite film for fruit and vegetable preservation and a preparation method thereof, and the preparation method comprises the following steps: performing sulfonation modification treatment on nano cellulose powder to obtain sulfonated nano cellulose; carrying out quaternization modification treatment on the sulfonated nano-crystalline cellulose to obtain quaternary ammonium sulfonated nano-crystalline cellulose; adding gelatin and sodium carboxymethyl cellulose into deionized water to obtain a wall material solution, and adding curcumin into the wall material solution to obtain a prepolymer solution; stirring and emulsifying the prepolymer solution at a high speed to obtain a prepolymer suspension; adding a chitosan solution into the prepolymer suspension to obtain a microcapsule solution, adding tannic acid into the microcapsule solution to obtain a microcapsule suspension, and performing spray drying to obtain double-layer microcapsule powder; the preparation method comprises the following steps: uniformly mixing polylactic acid, quaternary ammonium sulfonated nanocellulose, the double-layer microcapsule powder, a plasticizer, a lubricant and an antioxidant to obtain a mixed material, and sequentially carrying out melt extrusion, cooling, pelletizing and film blowing.

The invention discloses a preparation method of acrylic ink, which comprises the following steps: S1, mixing acrylic acid, waterborne acrylic resin, polyvinyl alcohol resin, alkyl glycoside and deionized water in a homogenizer, adding casein, and performing ultrasonic treatment in ultrasonic equipment to obtain acrylic mixed emulsion; s2, dispersing an acrylic acid mixed emulsion, carbon black, modified sodium alginate, a polycarbodiimide emulsion, polyether modified organic silicon and sodium carboxymethyl cellulose in a dispersion kettle to obtain a mixture; s3, grinding the mixture in a wet grinding machine; and S4, putting the ground mixture into a stirrer, adding triethanolamine, and mixing to obtain the finished ink. The water-based ink prepared by the invention has the advantages of strong adhesive force, good water resistance, high surface drying speed, good ink glossiness, difficulty in oxidation and decoloration, environmental protection, safety, simple production process and easiness in popularization.

The invention provides a biochar composite porous material for heavy metal contaminated soil remediation and a preparation method and application of the biochar composite porous material. The preparation method comprises the steps that biomass raw materials are subjected to high-temperature pyrolysis carbonization and then smashed, ground and sieved, and biochar powder is obtained; dispersing in a phosphoric acid solution to obtain a biochar solution, and filtering, washing and drying after a hydrothermal activation reaction to obtain activated biochar; dispersing in a chitosan solution, carrying out ultrasonic oscillation, filtering, washing and drying to obtain modified charcoal; mixing sodium bentonite, attapulgite and deionized water, uniformly mixing the modified charcoal, the functional slurry and a sodium carboxymethyl cellulose solution to obtain composite slurry, performing compression molding to obtain a green body, and then drying and calcining the green body. The biochar composite porous material prepared by the invention can simultaneously play multiple roles of physical adsorption, chemical chelation, ion exchange and the like in a heavy metal contaminated soil treatment process, so that efficient fixation of various heavy metal ions is realized.

The invention discloses an all-solid-state composite dry conductive agent and a preparation method thereof, and belongs to the technical field of batteries. The all-solid-state composite dry conductive agent is prepared by the following steps: uniformly mixing carbon nanotubes, high-dispersion carbon black and graphene to obtain a primary mixture; then preparing a uniformly dispersed glue solution from the composite dispersant and water; and then adding the primary mixture into the glue solution, uniformly mixing, sanding, homogenizing, drying and crushing to obtain the product, the high-dispersion carbon black is obtained by oxidizing carbon black to form active groups such as carboxyl and hydroxyl on the surface of the carbon black, halogenating acyl and then reacting with lithium 2, 5-diaminobenzene sulfonate. The preparation method comprises the following steps: grafting histidine ester into carboxymethyl cellulose by using propylene glycol diglycidyl ester as a cross-linking agent, then introducing allyl-1, 3-sultone, then copolymerizing with lithium 2-acrylamido-2-methylpropanesulfonate and 3-aminobenzoic acid allyl ester protected by fluorenylmethoxycarbonyl, and then deprotecting to obtain the composite dispersant.

The invention discloses a lithium battery negative electrode binder of modified carboxymethyl cellulose lithium, and belongs to the technical field of lithium ion batteries, and the modified carboxymethyl cellulose lithium is prepared by grafting carboxymethyl cellulose with an acrylic monomer and a sulfonic monomer, acidifying, lithiating, cross-linking with cystine, and carrying out surface modification with 2-(3, 4-dihydroxyphenyl) ethylamine. The preparation method comprises the following steps: grafting an acrylic monomer and a sulfonic monomer copolymerization long chain on a main chain of carboxymethyl cellulose, introducing additional carboxyl and sulfonic groups, and introducing cystine with a disulfide bond as a cross-linking agent and 2-(3, 4-dihydroxyphenyl) ethylamine with a catechol group as a tackifier to prepare modified carboxymethyl cellulose lithium; the lithium content of the obtained modified lithium carboxymethyl cellulose is higher than that of common lithium carboxymethyl cellulose, the adhesive property is enhanced, the toughness is improved, and the cycle performance is enhanced.

The invention discloses a modified sodium carboxymethyl cellulose-based binder, and belongs to the technical field of binders for lithium ion batteries. According to the modified sodium carboxymethyl cellulose-based binder, CMC-Na is used as a raw material, and a modifier is added, so that the modified sodium carboxymethyl cellulose-based binder is obtained; the modifier is any one of a mixture of PA (polyamide) and CaCl2 or PEI (polyetherimide). The specific capacity of the prepared C-PEI-10% pole piece is 2249.1 mAh g <-1 > after 100 cycles under the current density of 0.2 C, and a compact SEI layer can be formed on the electrode. The specific capacity of Si-coated C-PA-Ca < 2 + > is 1879.7 mAh g <-1 > after 300 cycles under the current density of 0.5 C, and the capacity retention ratio is 70.85%.