554 results about "Cellulose methyl" patented technology

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 building material modification, in particular to an anti-freeze thawing-sulfate composite modifier and application thereof in a water-stable base layer. In road engineering, a water-stable base layer often faces the problems of freeze-thaw cycle and sulfate erosion damage. The key point of the technical scheme of the invention is as follows: on the basis of the mass of cement, a composite modifier is composed of the following components in percentage by mass: 2%-5% of sodium sulfate, 0.02%-0.05% of sodium gluconate, 0.4%-0.6% of polypropylene fiber, 0.1%-0.2% of steel fiber, 1%-3% of butadiene styrene rubber emulsion, 0.05%-0.5% of sodium carboxymethyl cellulose, 0.05%-0.1% of triethanolamine, 0.1%-0.5% of naphthalene water reducer, 0.005%-0.02% of air entraining agent, 8%-10% of silica fume and the like. The composite modifier is mainly used for the water-stabilized base, can effectively improve the freeze-thaw resistance and sulfate erosion resistance of the water-stabilized base, and prolongs the service life of a road.

The invention relates to the technical field of battery materials, and discloses a flame-retardant anti-shrinkage coating self-crosslinking lithium battery diaphragm and a forming process thereof, and the flame-retardant anti-shrinkage coating self-crosslinking lithium battery diaphragm is composed of a battery base membrane and coatings coated on the surfaces of the two sides of the base membrane; the battery base membrane is prepared from the following raw materials in parts by weight: 80 to 120 parts of polypropylene fiber, 5 to 10 parts of sodium dodecyl benzene sulfonate and 1 to 3 parts of polydimethylsiloxane; the coating is prepared from the following components in parts by weight: 10 to 20 parts of modified silicon dioxide coated aluminum oxide containing long-chain fatty acid, 80 to 150 parts of amino-terminated triethoxy silane modified polyurethane emulsion, 3 to 5 parts of defoaming agent polydimethylsiloxane and 2 to 4 parts of thickening agent sodium carboxymethyl cellulose. The thickness of the battery base film is 10-30 [mu] m, and the thickness of the coating is 3-8 [mu] m. The lithium battery diaphragm disclosed by the invention has relatively good flame-retardant and shrinkage-resistant performance, and meanwhile, the service life of a battery can be effectively prolonged.

The invention discloses a lignin-inorganic oxide composite binder, preparation thereof and application of the lignin-inorganic oxide composite binder in a hard carbon negative electrode. The preparation method comprises the following steps: firstly, carrying out quaternization modification on lignosulfonate to obtain quaternized lignosulfonate, and then utilizing the action of quaternary ammonium and sulfonate of the quaternized lignosulfonate, hydroxyl and inorganic oxyacid radicals of inorganic nano oxide and carboxyl and hydroxyl of sodium carboxymethyl cellulose to prepare the modified lignosulfonate. The lignin-inorganic oxide composite binder with the interpenetrating network structure is formed. According to the binder, sodium carboxymethyl cellulose serves as a hard phase to enhance the mechanical rigidity, quaternized lignosulfonate rich in flexible long chains serves as a soft phase to bear part of loads, and inorganic nano oxide rich in hydroxyl serves as a crosslinking point or physical filler to enhance the structural stability of the binder. Besides, a multi-network structure formed by hydrogen bond crosslinking not only endows the binder with an excellent ion transmission rate, but also helps to enhance the interfacial compatibility of the binder with an ester electrolyte, thereby significantly improving the rate capability and cycle performance of the hard carbon negative electrode.

The invention provides antibacterial carboxymethyl cellulose hemostatic gauze and a preparation method thereof.The preparation method comprises the steps that carboxymethyl cellulose gauze is soaked in a PBS buffer solution, N-hydroxysuccinimide and 1-ethyl-(3-dimethylaminopropyl) carbodiimide are added into the PBS buffer solution, and a soaking solution is obtained after uniform mixing; adding the graft modified alginate oligosaccharide into the soaking solution, mixing and stirring to generate grafting reaction, taking out the carboxymethyl cellulose gauze after the reaction is finished, washing and drying to obtain the antibacterial carboxymethyl cellulose hemostatic gauze. According to the preparation method disclosed by the invention, the catechol-grafted modified alginate oligosaccharide and partially carboxymethylated carboxymethyl cellulose gauze are subjected to amidation grafting compounding, so that the hemostatic gauze with excellent antibacterial and hemostatic properties is prepared.

The invention discloses a preparation method of salt-resistant sodium carboxymethyl cellulose, and relates to the technical field of petroleum fracturing materials. The preparation method comprises the following steps: reacting stearic acid with ethylenediamine to obtain a monosubstituted intermediate, reacting the monosubstituted intermediate with cocoyl chloride to obtain an intermediate 1, reacting the intermediate 1 with epoxypropane to obtain an intermediate 2, and reacting the intermediate 2 with paratoluensulfonyl chloride to obtain a hydrophobic intermediate; reacting a sodium carboxymethyl cellulose solution with the hydrophobic intermediate to obtain modified sodium carboxymethyl cellulose, and sulfonating the modified sodium carboxymethyl cellulose with sulfamic acid to obtain crude salt-tolerant sodium carboxymethyl cellulose; and reacting the crude product salt-resistant sodium carboxymethyl cellulose with borax to obtain the salt-resistant sodium carboxymethyl cellulose. The salt-resistant sodium carboxymethyl cellulose prepared by adopting a step-by-step synthesis strategy has excellent salt resistance, temperature resistance, shearing resistance and dissolution rate, and is suitable for thickening and sand carrying of high-temperature and high-salt oil and gas field fracturing fluid.

The invention relates to the technical field of biomedical materials, and provides a preparation method and application of cross-linked carboxymethyl cellulose. The preparation method comprises the following steps: S1, dissolving anhydrous calcium chloride in absolute ethyl alcohol, sterilizing and filtering to obtain a sterile calcium chloride solution; s2, adding the dehydrated and purified sodium carboxymethyl cellulose into a sterile calcium chloride solution, and stirring for reaction; s3, after the reaction is finished, suction filtration is performed, filter residues are collected and washed, residual calcium chloride is removed, then vacuum drying is performed, and cross-linked carboxymethyl cellulose is obtained. The cross-linked carboxymethyl cellulose and sodium carboxymethyl cellulose have high consistency in chemical activity, physiological and biochemical activity, biocompatibility and safety risk, but in physical performance, the cross-linked carboxymethyl cellulose is hydrogel fiber, is insoluble in water, can more remarkably maintain the volume of a filling part, and is longer in duration time, so that the cross-linked carboxymethyl cellulose is more stable in filling. And the effects of instant filling and long-acting filling of the microsphere-containing surface filling agent are realized.

The invention discloses a carboxymethyl cellulose-based water-retaining slow-release fertilizer and a preparation method thereof, and belongs to the technical field of fertilizers. The carboxymethyl cellulose-based water retention and slow release fertilizer is composed of an aqueous solution, carboxymethyl cellulose (CMC), soluble starch (St), a cross-linking agent and urea (urea). Wherein the carboxymethyl cellulose (CMC) accounts for 2-7.5 wt.% of the mass of the aqueous solution; the soluble starch (St) accounts for 0.5-7.5 wt.% of the mass of the aqueous solution; the dosage of the cross-linking agent is 0.1-9 wt.% of the total mass of the carboxymethyl cellulose (CMC) and the soluble starch (St); according to the present invention, the natural macromolecular carboxymethyl cellulose and the starch are adopted as the skeleton, the cross-linking agent is combined, and the urea is introduced as the nitrogen source, such that the water retention slow release fertilizer applied to the farmland is developed, the fertilizer utilization rate is improved, the water is saved, and the material has characteristics of safety, environmental protection, excellent performance, stable quality and the like.

The invention relates to the technical field of sodium carboxymethyl cellulose granulation, in particular to a sodium carboxymethyl cellulose cyclic crushing and dust removal device which is characterized in that a feeding barrel assembly, a spiral conveyor and a screening assembly are fixed on a rack; the screening assembly comprises a discharging outer barrel body, a discharging inner barrel body and a sorting assembly; the bottom end of a discharging port of the feeding barrel assembly is connected with a smashing pipe body. The smashing pipe body is sequentially provided with a crushing cavity, a convex ring, a lower cavity and a filtering cavity from top to bottom in the height direction. The valve element assembly is used for sealing the end face of the convex ring in the rotating state of the crushing cutter body. A plurality of filtering holes are uniformly distributed in the surface of the filtering cavity; a sealing box is sleeved outside the filtering cavity; and an air inlet pipe of the air purification device is communicated with the sealing box. The screening device has the beneficial effects that the screening efficiency and the screening precision are improved, and dust adhering to the surfaces of finished product granules is reduced through dust removal treatment before screening in the granulating process, so that the dissolving speed of sodium carboxymethyl cellulose is guaranteed.

The invention relates to the technical field of chemical equipment, in particular to an efficient reaction kettle for sodium carboxymethyl cellulose production, which comprises a kettle body, a stirring motor is mounted at the top of the kettle body, a stirring shaft rotationally connected into the kettle body is fixedly arranged on an output shaft of the stirring motor, stirring blades are fixedly arranged on the outer wall of the stirring shaft, and a stock bin is further mounted at the top of the kettle body. The bottom of the stock bin extends into the kettle body, and a linkage type discharging mechanism connected between the stirring shaft and the stock bin is mounted on the top surface in the kettle body; according to the efficient reaction kettle for sodium carboxymethyl cellulose production, auxiliary materials can be added into materials in multiple times, the reaction rate can be better controlled, too violent or non-uniform reaction is avoided, the stability of the reaction process is ensured, the reaction uniformity and the product quality are further improved, and the production efficiency is improved by adjusting the time interval of adding the auxiliary materials every time. And the characteristics of the final product, such as viscosity, solubility and the like, can be optimized, so that the final product better meets the requirements of specific application.

The invention discloses a novel lightening material synthesis process for oil well cement, and belongs to the technical field of oilfield chemistry. According to the novel lightweight material synthesis process for oil well cement, diatomite is pretreated and aminated to obtain modified diatomite, and then floating beads are subjected to surface modification and SiO2 aerogel wrapping to obtain modified floating beads; the preparation method comprises the following steps: mixing modified diatomite with modified floating beads to obtain a composite light material, finally, respectively dissolving methyl alkenyl polyoxyethylene ether, lauryl sodium sulfate, hydroxypropyl methyl cellulose and nano silicon dioxide in deionized water to prepare a premixed solution, adding the premixed solution into the composite light material, and stirring to uniformly disperse the premixed solution to obtain the composite light material. The novel lightening material for the oil well cement is obtained. When the density of the novel lightening material for the oil well cement is 1.4 g / cm < 3 >, the novel lightening material for the oil well cement still keeps relatively high compressive strength.

The invention belongs to the technical field of metal adsorption material preparation, and particularly relates to a preparation method of an attapulgite composite cellulose hydrogel material, which comprises the following steps: (1) uniformly dispersing acid modified attapulgite in water, then adding sodium alginate and polyvinyl alcohol, heating and stirring; (2) adding sodium carboxymethyl cellulose, and continuously stirring to obtain a mixed solution; and (3) injecting the mixed solution into a mold by using an injector, freeze-thawing, freeze-drying, immersing into a CaCl2 solution, cross-linking, washing for multiple times, and freeze-drying again to obtain the attapulgite composite cellulose hydrogel material. Sodium alginate, polyvinyl alcohol, sodium carboxymethyl cellulose and acid modified attapulgite in a proper proportion are matched with a multiple freeze drying method to construct a three-dimensional structure with multiple chemical adsorption, high specific surface area, long diffusion channel and abundant pores, so that the adsorption efficiency and the adsorption capacity of the composite material are improved, and various application requirements are met.

The invention relates to the technical field of concrete, in particular to an anti-scouring ecological concrete formula for slope protection. The concrete comprises the following raw materials: 420-480 kg of cement; the coarse aggregate is 840 kg to 960 kg; the fine aggregate is 460 kg to 540 kg; the weight of the biochar is 90 kg to 120 kg; 6 kg to 10 kg of sodium carboxymethyl cellulose; 4 kg to 5.6 kg of a water reducing agent; 170 kg to 200 kg of water; in the formula of the anti-scouring slope protection ecological concrete, the raw materials are used and prepared, so that the pore structure of the concrete is optimized by the biochar, the compactness is improved, and the anti-scouring performance is enhanced; the sodium carboxymethyl cellulose is combined with the biochar to form a protective film with viscosity and toughness, so that the impact force of water flow is effectively buffered, and the loss of the biochar and the abrasion of the surface of the concrete are reduced; meanwhile, the water reducing agent reduces the water consumption, the strength and durability of the concrete are improved, and the anti-scouring capacity is further enhanced; under long-term water flow scouring or rainstorm erosion, the concrete can effectively keep the structure stable, the surface abrasion and peeling risks are reduced, and the engineering maintenance cost and potential safety hazards are reduced.

The invention provides flexible carboxymethyl cellulose ether, a preparation method thereof and a battery negative electrode slurry binder, and belongs to the technical field of negative electrode slurry binders. The flexible carboxymethyl cellulose ether provided by the invention comprises carboxymethyl cellulose and a flexible chain segment grafted on a side chain of the carboxymethyl cellulose. The side chain of the flexible carboxymethyl cellulose ether provided by the invention is grafted with the flexible chain segment, the type of the compound of the flexible chain segment is specifically limited, and the introduction of the flexible chain segment not only enables the molecular chain of carboxymethyl cellulose to have certain flexibility, but also reduces the interaction between the molecular chains of carboxymethyl cellulose, so that the flexibility of the carboxymethyl cellulose ether is improved. The flexibility and the plasticity of the carboxymethyl cellulose are improved. Results of the embodiment show that when the flexible carboxymethyl cellulose ether provided by the invention is applied to the battery negative electrode slurry, the coating surface density is increased to 550g / m < 2 >, a pole piece is not cracked and is low in warping in the drying process, and thick coating of the negative electrode slurry can be effectively realized, so that the phenomenon of cracking of the pole piece in the later period is reduced.

The invention discloses a graphene oxide-chitosan-carboxymethyl cellulose composite aerogel and an application of the graphene oxide-chitosan-carboxymethyl cellulose composite aerogel in adsorption of amaranth. The preparation method comprises the following steps: mixing a carboxymethyl cellulose aqueous solution with a chitosan acetic acid solution, adding gallic acid, stirring until the gallic acid is completely dissolved, adding the graphene oxide dispersion liquid, and stirring until a system forms uniform and stable gel; the gel is firstly subjected to ultralow-temperature freezing and then subjected to freeze drying, and finally the graphene oxide-chitosan-carboxymethyl cellulose composite aerogel is obtained. The aerogel prepared by the method is environment-friendly and stable in pore structure, and is a composite aerogel material with high adsorption capacity and good regeneration performance on anionic dyes. The adsorption capacity of the aerogel to amaranth can reach 125 mg / g, the adsorption rate is still kept at 77% after the aerogel is recycled for 3 times, and the aerogel is suitable for efficient treatment of dye wastewater.

The invention provides a temperature-sensitive hydrogel additive, a preparation method thereof and a hydrogel fire extinguishing agent. The temperature-sensitive hydrogel fire extinguishing additive comprises the following raw materials: a temperature-sensitive substance, a thickening agent, a cross-linking monomer, an initiator and a cross-linking agent in a mass ratio of (0.3-1.7): (0.2-0.9): (2-10): (0.1-0.3): (0.01-0.05), the temperature-sensitive substance is methyl cellulose and / or carboxymethyl cellulose, the thickening agent is carboxymethyl chitosan and / or chitosan, and the cross-linking monomer is acrylic acid. The temperature-sensitive type hydrogel fire extinguishing agent additive for the lithium battery fire disasters solves the problems that an existing fire extinguishing agent is weak in cooling capacity, low in fire extinguishing efficiency, poor in adhesiveness, high in reburning rate, not environmentally friendly in material and the like when coping with the lithium battery fire disasters, and can rapidly release water to absorb heat and cool under the high-temperature condition; meanwhile, a compact closed film layer is formed on the surface of the battery to isolate oxygen from being in contact with electrolyte, so that reburning is effectively prevented.

The invention discloses a method for removing lead and zinc in underground water of a mining area by using carboxymethyl cellulose modified nano zero-valent iron, which is characterized in that the underground water of the lead-zinc mining area is treated by using the carboxymethyl cellulose modified nano zero-valent iron, and the carboxymethyl cellulose modified nano zero-valent iron comprises nano zero-valent iron particles, the surface of the modified nano zero-valent iron is modified with carboxymethyl cellulose, and the mass ratio of the carboxymethyl cellulose to the iron element in the modified nano zero-valent iron is 1: (5-6). According to the invention, the adopted carboxymethyl cellulose modified nano zero-valent iron has the advantages of large specific surface area, many active sites, good mobility, good dispersibility, strong anti-interference capability and the like, can quickly adsorb lead and zinc in the water body, and can stably fix lead and zinc in the carboxymethyl cellulose modified nano zero-valent iron for a long time; the method has the advantages of simple process, low cost, high treatment efficiency, good removal effect, capability of ensuring long-term stability of heavy metal ions and the like, and is particularly suitable for long-term repair and treatment of lead and zinc pollution in underground water in mining areas.

The invention provides a method for synthesizing carboxymethyl cellulose by a slurry method based on a novel etherifying agent and an application, the method comprises the following steps: adding crushed cellulose into a reaction container filled with an organic solvent, stirring, continuously introducing nitrogen into the reaction container, and when the temperature of the reaction container reaches 25-35 DEG C, stirring for 2-3 hours; slowly dropwise adding a sodium hydroxide aqueous solution into the reaction container, keeping the temperature for a period of time, rapidly raising the temperature of the reaction container to 55 DEG C, slowly adding a novel etherifying agent into the reaction container, controlling the temperature of the reaction container to be kept at 55-75 DEG C, placing the reaction container at 65 DEG C after dropwise adding, and keeping the temperature for a period of time; wherein the novel etherifying agent is low-carbon alcohol chloroacetate or chloroacetamide, an acidic material is added into a reaction container to adjust the pH value of a reaction system to 6.5-7.5, washing liquid is used for multiple times to obtain carboxymethyl cellulose, and the novel etherifying agent is adopted to solve the problems of a traditional etherifying agent. And the high-quality and high-substitution-degree carboxymethyl cellulose is prepared.

The utility model relates to the technical field of fine washing and filtering of sodium carboxymethyl cellulose, and discloses a fine washing and filtering device of sodium carboxymethyl cellulose, which is characterized in that a filter screen is fixedly connected to one side, far away from a pushing column, of a connecting frame, and filter holes I are formed in the filter screen; one side of the reciprocating lead screw penetrates through the connecting block and is fixedly connected to the output end of the driving motor, the other side of the reciprocating lead screw is fixedly connected with a second belt wheel, and the second belt wheel is connected with a belt in an engaged mode. According to the sodium carboxymethyl cellulose fine cleaning device, the air cylinder is arranged, so that the filter screen moves upwards, impurities fall off from the water surface in the cleaning pool, the impurities on the water surface can be collected and treated during fine cleaning of sodium carboxymethyl cellulose, the situation that sodium carboxymethyl cellulose is mixed with the impurities again, and the fine cleaning effect of sodium carboxymethyl cellulose is affected is avoided, and the cleaning effect of sodium carboxymethyl cellulose is improved. The fine washing effect of the sodium carboxymethyl cellulose can be effectively improved, so that the sodium carboxymethyl cellulose can be finely washed more cleanly.

The utility model discloses a sodium carboxymethyl cellulose drying processing device, which relates to the technical field of sodium carboxymethyl cellulose drying processing, and comprises a bottom frame, the upper surface of the bottom frame is fixedly connected with a panel, the upper surface of the panel is fixedly connected with a drying mechanism, and the drying mechanism comprises a first air blower. The bottom face of the first air blower is fixedly connected with the upper surface of the bottom frame, the input end of the first air blower fixedly communicates with an air filtering cover, the upper surface of the panel is fixedly connected with a heating bin, the right side face of the heating bin fixedly communicates with a rotating air pipe, the upper surface of the rotating air pipe fixedly communicates with a transmission, and the input end of the transmission is fixedly connected with a high-speed motor. The output end of the transmission penetrates through the rotary air pipe and is fixedly connected with a centrifugal spraying head, and the inner wall of the panel is fixedly connected with a drying tower. The sodium carboxymethyl cellulose drying processing device has the advantages of being small in size, compact in design and convenient to move, and the purpose of being convenient to use in small processing factories is achieved.

The invention relates to a preparation method of a high-conductivity lithium composite aqueous binder for a high-voltage positive electrode material, which comprises the following steps: adding carrageenan into deionized water, uniformly mixing, adding sodium carboxymethyl cellulose, and stirring and mixing at room temperature for 24 hours to prepare a carrageenan-sodium carboxymethyl cellulose solution; and adding a pyrrole monomer into the carrageenan-sodium carboxymethyl cellulose solution, stirring and mixing for 5 minutes at room temperature, adding an initiator, stirring overnight at room temperature, and polymerizing to obtain the high-conductivity lithium-conductivity composite aqueous composite binder. According to the binder prepared by the invention, the conductivity and lithium conduction performance of the binder are bidirectionally improved, multi-electron transfer of an active material is excited, and the lithium ion transport stability is improved, so that the first-circle coulombic efficiency and long cycle performance of an electrode are improved.

The invention provides a method for reducing pesticide residues of cowpeas, and belongs to the technical field of cowpea cultivation. The method comprises the steps of seed pretreatment, soil preparation and sowing, seedling stage management and flowering stage management. In the seedling stage management, when 4-5 true leaves exist in the cowpea seedling stage, a control agent is sprayed to cowpea plants, and the control agent is composed of deionized water and a pesticide slow-release agent; the preparation method of the pesticide slow-release agent comprises the following steps: spraying a modifier onto biochar, raising the temperature for reaction, filtering, washing and drying to obtain modified biochar; placing matrine and acetamiprid in an ethanol solution to obtain a medicament mixed solution; adding the modified charcoal into the pesticide mixed solution, uniformly stirring, heating to 33-37 DEG C, adding lysine and arginine, uniformly stirring, adding carboxymethyl cellulose, and drying to obtain the pesticide slow-release agent. By planting the cowpeas through the method, pesticide residues in the cowpeas can be reduced, the yield can be increased, and the content and taste of vitamin C are guaranteed.

The invention provides light non-sintered ceramsite and a preparation method thereof, the non-sintered ceramsite is of a core-shell structure, an inner core is expanded perlite, a shell takes granite stone powder and desulfurized gypsum as main raw materials, and an interface modifier is added into the non-sintered ceramsite; the interface modifier comprises the following components in percentage by mass: 3%-8% of a silane coupling agent, 10%-18% of a nano silicon dioxide dispersion liquid, 25%-35% of a polyvinyl alcohol aqueous solution, 1.5%-3% of sodium carboxymethyl cellulose and the balance of deionized water. An interface modifier is added into the unfired ceramsite which takes expanded perlite as an inner core and takes a solid waste mixture such as granite powder and desulfurized gypsum as a shell, and the interface modifier can improve the physical and chemical characteristics of the surface of the expanded perlite and also can promote hydration reaction and interface bonding of shell slurry through a multi-component synergistic effect; the mechanical property and the stability of the unfired ceramsite are obviously improved.

The invention discloses a lithium battery pack with excellent cycle performance and a preparation method thereof, and belongs to the technical field of lithium battery pack preparation. The preparation method of the lithium battery pack with excellent cycle performance comprises the following steps: step 1, preparing positive electrode slurry by taking polyvinylidene fluoride, N-methyl pyrrolidone, an organic active substance and a modified conductive agent as raw materials, and coating the surface AB of an aluminum current collector with the positive electrode slurry to obtain a positive plate; step 2, graphite, carboxymethyl cellulose and deionized water are used as raw materials to obtain negative electrode slurry, and the AB surface of a copper current collector is coated with the negative electrode slurry to obtain a negative plate; and 3, winding the diaphragm, the positive plate and the negative plate into a roll core, vertically inserting the roll core into the steel shell, drying, injecting electrolyte, welding to obtain lithium batteries, and then connecting the lithium batteries in series to obtain the lithium battery pack. The lithium battery pack prepared by the method has excellent energy density, cycling stability and rate capability.

The invention discloses a preparation method of an environment-friendly lithium battery fire extinguishing agent based on nanofiber gel, and relates to the technical field of fire extinguishing. When the environment-friendly lithium battery fire extinguishing agent is prepared, nano sodium carboxymethyl cellulose reacts with N-isopropylacrylamide and N, N-methylene bisacrylamide to prepare semi-interpenetrating network hydrogel; the semi-interpenetrating network hydrogel and calcium lactate are cross-linked, and nano sodium carboxymethyl cellulose hydrogel is prepared; and mixing and stirring the nano sodium carboxymethyl cellulose hydrogel, the modified silicon carbide and a flame retardant to prepare the environment-friendly lithium battery fire extinguishing agent. The prepared environment-friendly lithium battery fire extinguishing agent has good fire extinguishing performance.

The invention belongs to the technical field of chemical production, and particularly relates to a sodium carboxymethyl cellulose processing and feeding device which comprises a rack, a conveying belt is arranged on the rack, and a flow dividing assembly is further arranged on the rack; the shunting assembly comprises a second frame body fixedly connected to one side of the upper end of the rack, the upper side of the second frame body is transversely distributed at equal intervals and sleeved with a plurality of connecting rods, the connecting rod on the leftmost side is fixedly connected with the second frame body, the other connecting rods are slidably connected with the second frame body, and a first check block is rotationally arranged on one side of the lower end of each connecting rod; the first check block is connected with a second check block in an inserted and sliding mode. According to the material receiving device, a plurality of feeding channels matched with the material receiving openings in position and specification can be formed on the conveying belt according to the number of the receiving devices and the width of the material receiving openings through the flow dividing assembly, production materials can accurately fall into all the material receiving devices along the feeding channels, and the material receiving effect is guaranteed.

The invention provides a polyurethane polishing pad and a preparation method thereof, the polyurethane polishing pad comprises a polyurethane mixture, the polyurethane mixture comprises a polyurethane prepolymer, a curing agent and a heat dissipation filler; in the polyurethane mixture, the mass percent of the polyurethane prepolymer is 50%-90%, the mass percent of the curing agent is 10%-30%, and the mass percent of the modified filler is 1%-10%; the water-soluble polymer compound system comprises polyvinylpyrrolidone, carboxymethyl cellulose and polyethylene glycol, the water-soluble polymer compound system is characterized in that the polyvinylpyrrolidone and the carboxymethyl cellulose are grafted to form a grafted copolymer, the grafted copolymer is compounded with the polyethylene glycol, and the mass ratio of the polyvinylpyrrolidone to the carboxymethyl cellulose in the grafted copolymer is 10: (1-2). The heat dissipation filler is added into the polyurethane, so that an effective heat dissipation effect can be achieved, the polishing uniformity is prevented from being affected by overheating of the polishing pad and the wafer, and the surface temperature of the polished wafer is moderate.

The invention belongs to the technical field of preparation of modified cellulose carboxymethyl cellulose and nano-emulsion, and particularly relates to a preparation method of novel amphiphilic cellulose carboxymethyl cellulose palmitate, which comprises the following steps: S1, preparing palmitoleic acid from palm oil as a raw material, and further preparing palmitoleic acid into palmitoleic anhydride; and S2, reacting palmitoleic anhydride obtained in the step S1 with carboxymethyl cellulose, and purifying after the reaction is finished to obtain the carboxymethyl cellulose palmitate. According to the preparation method, ester bonds on palmitoleic acid anhydride and hydroxyl groups on carboxymethyl cellulose are replaced by utilizing the prepared novel palmitoleic acid anhydride derivative through ester exchange reaction, so that the amphipathic carboxymethyl cellulose palmitate is obtained. The novel amphiphilic cellulose carboxymethyl cellulose palmitate synthesized by the invention is green in reaction process and high in reaction activity of palmitic anhydride, and provides a basis for subsequent application in the aspect of self-assembly entrapment.

The invention discloses a sodium carboxymethyl cellulose-zeolite-chitosan copolymer, a preparation method, a coagulant and application, and belongs to the field of water treatment. CS, CMC-Na and a zeolite solution are directly added into treated water according to a certain sequence, the CS, CMC-Na and zeolite are subjected to an in-situ self-assembly process, the formed sodium carboxymethyl cellulose-zeolite-chitosan copolymer (CMC-Zeo-CS) has a net-shaped spongy structure, the turbidity removal efficiency of the structure is superior to that of CS, CMC-Na and a traditional coagulant (FeCl3 solution), and the water treatment effect is good. And the formed flower has good mechanical strength, and the coagulation precipitate is high in re-settling speed and good in settling effect after being disturbed and suspended by the outside.

The invention discloses lithium ion diaphragm coating slurry and a preparation method and application thereof.The lithium ion battery diaphragm comprises a base membrane and a coating on the base membrane, the coating comprises a dispersing agent, potassium carboxymethyl cellulose and side-chain modified polyvinylidene fluoride, and the method for preparing the side-chain modified polyvinylidene fluoride comprises the steps that vinylidene fluoride, hexafluoropropylene, (S)-4-pentene-1, 2, 4-triazole-1, 2, 4-triazole-1, 2, 4-triazole-1, 2, 4-triazole-1, 2, 4-triazole-1, 2, 4-triazole-1, 3-triazole-1, 3-triazole-1, 2-triazole-1, the preparation method comprises the following steps: uniformly mixing 1, 2-diol, (S)-3-(trifluoromethyl) adipyl dichloride, an initiator, an auxiliary agent and a solvent, and reacting for 9-12 hours in an inert gas atmosphere at 75-80 DEG C under a stirring condition to obtain a reaction solution; and carrying out spray drying on the reaction liquid to obtain the side chain modified polyvinylidene fluoride. The coating slurry provided by the invention can realize firm bonding between the diaphragm and a pole piece at room temperature, improves the stability and safety of a battery structure, and remarkably reduces the internal resistance of the battery diaphragm at the same time.