525 results about "Cellulose methyl" patented technology

The invention discloses carboxymethyl cellulose of wheat straw. The wheat straw is crushed and subjected to pretreatment with dilute alkali, bleaching and alkalization, and then reacts with chloroacetic acid before being etherified so as to obtain the carboxymethyl cellulose of the wheat straw; and the carboxymethyl cellulose of the wheat straw is subjected to graft copolymerization together with acrylic acid to obtain a carboxymethyl cellulose-based polymer adsorbent. The adsorbent is applied to the treatment of wastewater containing heavy metal ions, has high adsorbability and large adsorption capacity and ensures high metal ion removal rate. After treatment, the adsorbent has high stability and can completely meet the requirements of heavy-metal wastewater treatment; and the treated wastewater is clear and transparent without odor and can meet the national emission standard. The invention has the advantage that the resources of raw materials are wide, the cost is low, the use of waste is realized, and secondary pollution caused by burning of the wheat straw is avoided, thus being conducive to environmental protection.

The present invention discloses an efficient ferrous sulfide / biological carbon composite material and a preparation method thereof, and applications of the ferrous sulfide / biological carbon composite material in repair of heavy metal pollution water bodies. According to the present invention, biological carbon is adopted as a carrier, a ferrous sulfate solution and the biological carbon are mixed, sodium carboxymethyl cellulose is added as a stabilizer and a dispersant, a sodium sulfide solution is added to the system in a dropwise manner under the nitrogen protection, and vigorous stirring is performed to make the generated ferrous sulfide nanoparticles uniformly grow on the surface of the biological carbon, such that the disadvantage that the ferrous sulfide nanoparticles are easily agglomerated is substantially improved so as to increase the effective contact area between the ferrous sulfide nanoparticles and the pollutant, and the adsorption ability and the oxidation reduction ability of the ferrous sulfide and the biological carbon are integrally combined so as to improve the pollutant removal ability; the preparation method has advantages of simple and rapid process, low production cost, environmental protection and no secondary pollution; and the efficient ferrous sulfide / biological carbon composite material can strongly repair the Cr(VI) polluted water body, can effectively reduce the biological toxicity of the Cr(VI) on wheat seeds, and has wide application prospects in the fields of repair of organic pollution and inorganic pollution in environments.

The invention provides dialdehyde carboxymethyl cellulose-collagen frozen gel and a preparation method thereof. The method comprises the following steps of: first uniformly mixing 1 to 3 mass percent of the aqueous solution of collagen and 0.01 to 1 mass percent of the aqueous solution of dialdehyde carboxymethyl cellulose; then injecting the mixed solution into a mold and storing the mixed solution in a low-temperature reactor at the temperature of -40 to 0 DEG C for 1 to 7 days; and finally, taking the obtained product out and slowly unfreezing the obtained product to obtain the dialdehyde carboxymethyl cellulose-collagen frozen gel. The dialdehyde carboxymethyl cellulose-collagen freezing gel prepared by the method is improved in mechanical property, thermal stability and enzymatic degradation resistance at the same time of maintaining the biological activity of collagen gel per se, has the advantages of porosity, hydrophilicity, water absorbing and preserving property, good market application prospect and the like, and is widely used in biomedical fields, such as biologic scaffolds, cell culture, drug delivery, tissue engineering, wound and burning treatment and the like.

The invention discloses an MXene / silver nanowire composite electromagnetic shielding film. The composite electromagnetic shielding film is prepared from MXene, silver nanowires and a binder, wherein the mass ratio of the MXene to the silver nanowire is 0.05-20, and the mass dosage of the binder is 0.001-10% of the total mass dosage of the MXene and the silver nanowire; the binder is one or a mixture of more of sodium alginate, polyvinyl alcohol, polyvinylpyrrolidone, chitosan, hydroxypropyl methyl cellulose, carboxymethyl cellulose and sodium carboxymethyl cellulose. The MXene / silver nanowirecomposite electromagnetic shielding film is prepared by the following method which comprises the steps: fully mixing a silver nanowire solution with the binder to obtain a mixed solution 1, and fullymixing the mixed solution 1 with an MXene solution to obtain a mixed solution 2; and performing suction filtration on the mixed solution 2 to form a film, thereby obtaining the MXene / silver nanowire composite electromagnetic shielding film. The obtained composite electromagnetic shielding film has excellent electromagnetic shielding performance; the method is simple and easy to implement and low in cost, and batch production can be achieved.

The invention discloses a copper and lead separating cyanide-chrome-free beneficiation method for low-grade multi-metal sulfide ore. The beneficiation method is performed according to the following steps that (1) raw ore after ore grinding and grading enters the step of copper and lead bulk flotation to obtain copper and lead bulk concentrate and bulk flotation tailings, beneficiation reagents including 25# black powder and tetrabutyl ammonium black powder are adopted as collecting agents for copper and lead ore, and sodium sulfite and zinc sulfate are adopted as inhibitors of zinc ore; (2) copper and lead separating flotation is performed on the copper and lead bulk concentrate to obtain qualified copper concentrate and lead concentrate, in the copper and lead separating flotation process, activated carbon is adopted for reagent removal, and an inhibitor combined by sodium sulfite, sodium carboxymethyl cellulose and sodium humate serves as the inhibitor of lead sulfide ore. The beneficiation method has the following advantages of being low in price and production and application cost, it is unnecessary to perform special treatment on ore pulp, the process is easy to control, and technological and economic indexes are stable. The great defect that a dichromate titration method, a cyanide method and a less-cyanide-chrome technology can cause pollution to the environment is overcome, and the usage amount of beneficiation new water is greatly reduced.

The invention discloses a continuous production method of carboxymethylcellulose lithium for lithium batteries in order to solve the problems that a lithium ion battery adhesion agent pollutes the environment, is single in function and high in price. The production method includes the steps that sodium carboxymethyl cellulose is prepared, and the carboxymethylcellulose lithium is obtained after the sodium carboxymethyl cellulose is acidized, alkalinized and purified. The prepared carboxymethylcellulose lithium breaks the pattern that autonomous mass production of carboxymethylcellulose lithium cannot be achieved domestically, according to the current condition of domestic production, on the basis that the performance of the carboxymethylcellulose lithium is guaranteed, continuous and large-batch production of the carboxymethylcellulose lithium can be achieved, and production cost is greatly reduced. A series of product performance testing preparation parameters are summarized in the method, and the parameters are quality control indexes of carboxymethylcellulose lithium and can also provide a reference for establishing standards of industrialized carboxymethylcellulose lithium in future.

The invention discloses concrete taking industrial waste residues as an admixture and a preparation method thereof. The concrete taking industrial waste residues as an admixture is prepared from the following raw materials in parts by weight: 265-285 parts of cement, 360-400 parts of river sand, 940-970 parts of stones, 160-200 parts of water, 45-55 parts of fly ash, 45-70 parts of slag powder, 380-410 parts of artificial sand, 8-10 parts of an additive and 100-185 parts of modified phosphorus slag powder. The modified phosphorus slag powder comprises the following components: phosphorus slag,a grinding aid, stearic acid, a water reducing agent, water, water glass, aluminum potassium sulfate, sodium sulfate, polyacrylamide, carboxymethyl cellulose, coal gangue and gypsum. The concrete taking industrial waste residues as an admixture has the advantages that the setting time is short, the early strength is high, nitric oxide in automobile exhaust can be adsorbed and degraded, industrialsolid waste is utilized, environmental protection is facilitated, and waste is turned into wealth.

The invention discloses a low-cost denitration catalyst and a preparation process thereof. The catalyst comprises the following components: nanometer TiO2 powder, montmorillonite, ammonium metatungstate, ammonium metavanadate, chopped glass fiber, broad-leaf forest wood pulp fiber, carboxymethyl cellulose, polyoxyethylene and stearic acid. The preparation process of the low-cost denitration catalyst comprises the steps: dissolving the ammonium metavanadate by taking an aqueous solution of monoethanolamine as a solvent, dissolving the ammonium metatungstate into water under normal temperature, and continuously stirring the solution for 1h for later use; and sufficiently kneading the raw material of the catalyst to obtain a plastic pug, placing the plastic pug into a sealed plastic bag to store for a plurality of hours to age, forming the pug into a honeycomb-shaped catalyst blank, entering a dried honeycomb body into a mesh band type tunnel kiln for roasting, cutting a final roasted product according to the required length, assembling the product into a module box body, and externally packaging the product. The low-cost denitration catalyst is low in cost and capable of effectively improving the denitration performance, enhancing the mechanical strength of the product and improving the wear resistance.

The invention provides a high temperature far infrared insulation energy-saving coating material and its preparing process, wherein the coating material comprises zircon sand, aluminium oxide, porcelain clay, rare-earth oxide, boron nitride, silicasol, phosphoric acid, soluble glass, cellulose methyl or cellulose glycolate. The preparing process consists of batching, immersing, agitating, mixing, filtering and loading.

A micro-suspension self-selection water shutoff and profile control agent. A layer self-selection water shutoff and profile control agent applied to oil deposit with middle and high water content can carry out self-selection water shutoff and profile control in a layer of complex oil deposit with middle and high water content, a lateral well and a secondary big pore channel. The water shutoff and profile control agent comprises 5-50% of asphalt, 1-5% of olefin, 0.5-1.0% of octadearyl dimethyl ammonium chloride, 0.1-0.15% of carboxymethyl cellulose sodium, 5-15% of stable control agent sodium hydroxide aqueous solution and the balance of water. The preparation method comprises step of processing the raw materials into stable micro fluid suspension with a particle size of 1 mum-1mm through machinery crushing and grinding by a colloid mill. The invention has the following beneficial effects: the water shutoff and profile control agent can be applied to layer self-selection water shutoff and profile control of oil deposit with high water content; a main agent asphalt can be dissolved in light oil completely but not in water; plastic colloid can be precipitated; and blocking of different strength can be realized through reasonable selection and assembly of softening points of the main agent.

The invention belongs to the field of microbial fermentation, and relates to a method for modifying bacterial cellulose in the fermentation process. The method comprises the following steps of: activating strains for fermentation production of the bacterial cellulose and preparing seed liquid; adding the seed liquid into a fermentation medium added with hydroxypropylmethylcellulose and carboxymethyl cellulose sodium, and standing for fermentation; and collecting a bacterial cellulose film generated on the surface of the medium, performing alkali washing, and drying until the water content is less than 5 percent. The method is simple and practicable; aftertreatment is not needed, the net structure of the bacterial cellulose can be changed directly in the bacterial cellulose fermentation process, and the hydrogen bond action in molecules and between molecules is reduced; moreover, used reagents are low in cost, and special equipment is not needed; and the prepared bacterial cellulose product has high rehydration and the application range of the bacterial cellulose product is widened.

The invention provides a method for producing potassium carboxymethylcellulose by a kneading method, which comprises the following steps of: alkalizing cellulose by high-concentration potassium hydroxide liquid and industrial potassium hydroxide solid to generate alkali cellulose; after the generated alkali cellulose is subjected to carboxymethylation of chloroacetic acid, adding the potassium hydroxide liquid and the industrial potassium hydroxide solid again to carry out secondary alkalization; then adding chloroacetic acid to carry out secondary carboxymethylation treatment; and washing, neutralizing, centrifuging, drying and grinding to obtain the potassium carboxymethylcellulose product. The product not only has good dissolubility, but also has simple production process, short reaction period, low equipment investment and low raw material consumption.

Disclosed is a paint to be sprayed to the clear water concrete base layers of exterior wall of buildings or city elevated highways, which is prepared from white cement 45%, fine quartz flour 42%, talcum powder 6%, dispersible latex powder 6%, cellulose methyl 0.2%, water reducing agent 0.4%, super fine silicon powder 3.3%, defoaming agent 0.4% and pigment 2.7%.

The invention discloses a preparation method of high-salt resistance high-viscosity sodium carboxymethylcellulose. The method takes refined cotton as a cellulose raw material and comprises the steps of alkalization of cellulose and etherification of alkali cellulose, and is characterized in that the average degree of polymerization of the refined cotton is 3,000-3,300. The method disclosed by the invention takes the tailor-made refined cotton with high degree of polymerization as a cellulose raw material, adopts proper temperature control and adds nitrogen in alkalization reaction; and through the effective means of reasonable design of technological formula and technological time and the like, the viscosity of the product reaches over 6,000 mpa.s in 1% aqueous solution, the salinity-viscosity ratio is greater than or equal to 0.90, and the substitution ratio is greater than or equal to 0.90 according to the measurement by a Brookfield LVDV-I+ type viscometer. Through the preparation method disclosed by the invention, the prepared high-salt resistance high-viscosity sodium carboxymethylcellulose can substitute for guar gum, and is applied to a high-pressure hydrofracturing method for extracting oil gas from oil shale. The high-salt resistance high-viscosity sodium carboxymethylcellulose can be used for improving the viscosity of a proppant and can be pressed into a shale gap to expand the crack for the extraction of petroleum and natural gas. The high-salt resistance high-viscosity sodium carboxymethylcellulose is also favorable for reducing the friction force, and the energy consumed for extraction can be reduced.

The invention relates to an oral medicinal formulation of moxifloxacin and its preparation method, which comprises Moxifloxacin or its salt and / or its hydrate, and at least one film forming material for preparing intermediate particles of the preparation selected from hydroxy propyl methyl cellulose, hydroxy ethyl methyl cellulose, cellulose methyl, hydroxy propyl cellulose, hydroxy ethyl cellulose, sodium carboxymethyl cellulose, polyacrylic resins, polyethylene glycol, polyvinyl pyrrolidon-vinyl acetate copolymer, polyvinyl alcohol-polyethylene glycol grafted copolymer, carbopol, gelatine, poloxamer and polyvinyl pyrrolidon. The invention also discloses the process for preparing the pharmaceutical preparation.

The present invention discloses a strength-improvable blended regenerated cotton yarn which is characterized being prepared from the following raw material by weight: 30-33 parts of waste cotton fabrics, 15-17 parts of cotton yarn leftover material, 2-3 parts of glycerin, 8-10 parts of copper ammonia fibre, 3-4 parts of starch, 3-5 parts of nano-silica, 39-44 parts of polypropylene, 3-5 parts of nano-zinc oxide, 12-14 parts of liquid paraffin, 9-10 parts of nano-titanium dioxide, 1.5-parts of carboxymethyl cellulose, 1-2 parts of glyceryl stearate, and proper amount of water; the starch, the nano-silica and other components are used for prepare processing slurry to process waste cotton fabric renewable fiber, the strength and sunscreen resistance of the fiber are improved, then the waste cotton fabric renewable fiber is mixed with the copper ammonia fiber, and strength and hand feel of the fiber are improved by cotton carding; the strength-improvable blended regenerated cotton yarn is prepared by addition of the nano-titanium dioxide and the nano-zinc oxide-modified polypropylene staple fiber for blending, the strength of the cotton fiber is improved, and the strength-improvable blended regenerated cotton yarn has the characteristics of easy staining and grinding resistance.

The invention relates to a gypsum base swelling perlite heat-insulating mortar dry powder, wherein each unit of the thermal insulating mortar dried powder comprises the following raw material as the components: expanded perlite 0.9-1.1m3, beta CaSO4*1 / 2H2O 145-165kg, common silicate cement 18-22kg, grade I coal ash and / or grade II coal ash and / or high calcium ash 45-65kg, polypropylene fiber 0.4-1kg, 80-100 mesh heavy calcium powder and / or calcium carbonate powder 1.3-1.7kg, cellulose methyl and / or methylcellulose propylene glycol ether 1.5-2.5kg, gypsum retarder 3.0-5.0kg and sodium dodecyl silicate 0.008-0.013kg.

The invention discloses a chitosan-sodium carboxymethyl cellulose layer-by-layer self-assembly probiotics microcapsule and preparation thereof. The chitosan-sodium carboxymethyl cellulose layer-by-layer self-assembly probiotics microcapsule comprises a wall material and a core material wrapped by the wall material. The core material is mainly a mixture formed by probiotics sludge and trehalose, and the wall material is mainly a multilayer structure formed by self-assembling chitosan and sodium carboxymethyl cellulose layer by layer. According to the invention, the detailed structure (particularly the material and the structure adopted by the capsule wall) of the probiotics microcapsule is improved, the whole process of a preparation method is correspondingly designed, the capsule wall formed by polyelectrolyte layer-by-layer self-assembly of chitosan and sodium carboxymethyl cellulose components is utilized, and the obtained chitosan-sodium carboxymethyl cellulose layer-by-layer self-assembly probiotics microcapsule is resistant to acids, resistant to bile salts and resistant to digestive enzymes, improves the stability of probiotics, and can enhance the intestinal planting effectof the probiotics.

The invention discloses a composite water-soluble temporary plugging agent for oilfield steering fracturing construction, wherein the composite water-soluble temporary plugging agent comprises the following raw materials by weight: 32.1-53.6 parts of a coating material, 17.9-29.8 parts of temporary plugging particles and 16.7-50.0 parts of temporary plugging fibers, wherein the coating material isselected from sodium polyacrylate, sodium carboxymethyl cellulose, bone glue and gelatin, the temporary plugging particles are selected from sea salt particles, potassium chloride particles, calciumcarbonate particles and calcium chloride particles, and the temporary plugging fibers are selected from polyvinyl alcohol fibers, polyester fibers, asbestos fibers and cotton fibers. According to theinvention, the composite water-soluble temporary plugging agent is suitable for plugging cracks with millimeter-scale crack widths, can resist a temperature of 120-140 DEG C, has a plugging pressure gradient peak value of more than 30 MPa / m, and can be completely dissolved into a clear liquid with a viscosity close to the viscosity of water within 2 h at 140 DEG C; and the composite water-solubletemporary plugging agent has characteristics of large plugging pressure gradient, short plugging removal time, no damage to stratum and the like.

The invention discloses a preparation method of an adhesive for improving cycling stability of a silicon electrode of a lithium battery, which comprises the following steps that acrylic acid, deionized water, graphene coated cobalt molybdate reticulate nanosheets, carboxymethyl cellulose and a photoinitiator are uniformly mixed and then are directly ultraviolet light cross-linked through an in-situ polymerization method, so that the adhesive containing a polyacrylic acid grafted carboxymethyl cellulose copolymer is obtained. According to the preparation method disclosed by the invention, the graphene coated cobalt molybdate reticulate nanosheets are added into the adhesive, and the network structure of the material is utilized, so that the nano silicon particles can be effectively prevented from moving in the circulation process, the electrode structure is kept stable, and the cycling stability of the electrode is facilitated.

The invention provides a preparation method of an antibacterial and hydrophobic biodegradable membrane. The preparation method comprises the following steps: 1) weighing a certain amount of modified chitosan powder and sodium carboxymethyl cellulose powder; adding a certain amount of de-ionized water into the powder respectively; swelling at constant temperature and stirring uniformly; placing for 24h at a room temperature, so as to finally obtain a modified chitosan solution and a sodium carboxymethyl cellulose solution; 2) mixing the two prepared solutions at a certain mass ratio and mixing under a certain condition to prepared a uniform water solution; pouring the mixed solution into a mold and putting the mold into an air blowing drying box; drying to obtain a modified chitosan / sodium carboxymethyl cellulose composite membrane. Compared with the prior art, the preparation method of the antibacterial and hydrophobic biodegradable membrane, provided by the invention, is simple to operate and has no corrosion to equipment; the composite membrane prepared by the invention has good biodegradability, sterilization and bacterium-inhibition performances and hydrophobic property; meanwhile, the tensile strength and the elongation at break are remarkably increased.

The invention relates to a dense colloid used in fire hazard treatment in coal layer, wherein it is formed by water, skeleton, and densifier; the skeleton is one of cola ash, loess, sand or stone powder; the densifier is one or several of carboxymethyl cellulose, cellulose ethyl ether, carboxymethyl hydroxyethyl cellulose, cellulose methyl, carboxyethyl cellulose, hydroxypropyl cellulose methyl, butyl cellulose, glycol cellulose, and hydroxypropyl cellulose; when using, mixing the water, densifier, and skeleton to be poured into fire area. The inventive colloid has strong water kept ability, and better adhesive with the coal, to effectively pack high-temperature coal, and improve the fire extinction effect; and the water and skeleton are not easily separated, to prolong the cooperation between them, reduce the evaporate speed of said product in high temperature to avoid explode water gas.

The invention relates to a composite binder for a lithium battery and an application of the composite binder. The composite binder for the lithium battery consists of a flexible binder polytetrafluoroethylene and a rigid binder, wherein the rigid binder is selected from at least one kind of polyacrylate, acrylonitrile multipolymer, carboxymethylcellulose and sodium carboxymethylcellulose; and the mass ratio of the flexible binder polytetrafluoroethylene to the rigid binder is (6-16) to (1-4). By adoption of the compounding of the "flexible" binder PTFE and the "rigid" binder, the complementary property characteristics of the two kinds of binders are utilized, so that the tendency of pulse capability decline at the discharging tail end of a lithium-manganese dioxide battery is relieved; and meanwhile, organic functional groups of the polyacrylate, the acrylonitrile multipolymer, natural cellulose modified materials and the like can be coordinated with Mn atoms, so that reaction sites on the surface of the positive electrode manganese dioxide can be reduced, generation of side reaction caused by manganese dioxide catalysis can be lowered, the internal stability of the lithium-manganese dioxide battery system is improved, and the storage life of a lithium-manganese battery is prolonged.

The invention discloses a harmless and biodegradable soy protein isolate / hyaluronic acid / sodium carboxymethyl cellulose composite film and a preparation method thereof. The soy protein isolate / hyaluronic acid / sodium carboxymethyl cellulose composite film is prepared by a solution blending method, and soy protein isolate is dissolved and modified in water, mixed with a hyaluronic acid solution, and then added with carboxymethyl cellulose sodium and a plasticizer glycerin; and the mixture is stirred uniformly at room temperature to form the film by slobbering, and then the film is dried and balanced in a hygrostat. The composite film is closely arranged due to the hydrogen bonds and other forces between substrate molecules, and has good properties. The preparation method provided by the invention is simple, the cost is low, and the obtained soy protein isolate / hyaluronic acid / sodium carboxymethyl cellulose composite film has good mechanical properties and water resistance, and has better application prospects in packaging.

The invention discloses a method for preparing a catalyst Cu-UiO-66 for preparing methanol from a synthesis gas, wherein Cu(NO3)2.3H2O, trimesic acid, sodium carboxymethyl cellulose, ammonium chloride, 2-amino terephthalic acid, zirconium tetrachloride and terephthalaldehyde are taken as the main raw materials, Schiff base organic modified UiO-66 is taken as a seed crystal, a hydrolysate of the sodium carboxymethyl cellulose and the trimesic acid are induced under the condition of ultrasonic treatment to have a coordination reaction with Cu<2+>, the crystallization time is greatly shortened, and the metal organic catalyst is rapidly prepared. The prepared organic modified metal catalyst Cu-UiO-66 has the advantages of high selectivity and fast kinetic equilibrium, and no secondary pollution in the technical process, and the catalyst is higher in stability and catalytic activity in the reaction for preparing methanol from synthesis gas.

The invention discloses a recovery treatment method for wastewater generated in production of carboxymethyl cellulose. The method includes steps that wastewater generated in production of carboxymethyl cellulose after adjustment by PH (potential of hydrogen), preliminary filtering and decontamination flows into an ultrafilter, a reverse osmosis device and an evaporator sequentially to be condensed, crystallized and centrifugally separated to obtain rough sodium chloride which is treated to obtain industrial solid sodium chloride, mother liquor is separated to be continuously condensed, and industrial glycolic acid is obtained after the mother liquor is treated. High-salted difficultly-degraded organic wastewater generated in production of carboxymethyl cellulose is treated by the recoverytreatment method, recovery treatment which can turn harm into good and turn waste into wealth is realized, and prominent economic, social and environmental benefits are achieved. In addition, the recovery treatment method is simple in operation, low in energy consumption, low in treatment cost, free of environment pollution, low in operation management difficulty, stable in operational effect, high in resource utilization efficiency of treatment of wastewater generated in production of carboxymethyl cellulose and effective.

The invention relates to a free liquid controlling agent for oil well cement slurry, a preparation method, and applications thereof, and relates to the field of well cementation of oil / gas well. The free liquid controlling agent comprises blended suspension, which is composed of the following components in parts by weight: 100 parts of water, 10 to 30 parts of nano attapulgite, 20 to 40 parts of nano silica, 0.1 to 1 part of dispersant, which is at least one of polycarboxylic acid dispersant, silane polymerized dispersant, and polysulfonic acid dispersant, and 0.5 to 1 part of slurry stabilizing agent, which is at least one of hydroxyethyl cellulose, sodium carboxymethyl cellulose, xanthan gum, scleroglucan, and welan gum. The provided free liquid controlling agent can effectively eliminate or reduce free liquid in oil well cement slurry, and can be used to prepare free-liquid-free cement slurry.

The invention relates to a preparation method of calcium hydroxide with high dispersity and high specific surface area. Quicklime is used as a raw material, natural nanocellulose with rich oxygen-containing groups is added in the digestion reaction process to serve as a template and a surfactant sodium carboxymethyl cellulose is added in the digestion reaction process, high-speed shearing and sufficient mixing are performed, nucleation and growth of calcium hydroxide are achieved based on the ultrasonic action, and calcium hydroxide with high specific surface area is obtained through washing,centrifuging, drying and grinding. According to the method, natural nanocellulose is used as a template to realize controllable synthesis of calcium hydroxide with high specific surface area, the surfactant sodium carboxymethyl cellulose is added in the process to synergistically improve the dispersibility and stability of calcium hydroxide, and the application range of calcium hydroxide is greatly widened on the basis of improving the performance of calcium hydroxide.

The invention discloses a method for preparing a carboxymethylcellulose sodium composite-filled polyamide nanofiltration membrane. The method comprises the steps: preparing a carboxymethylcellulose sodium composite by an ionic crosslinking method, adding the carboxymethylcellulose sodium composite into an aqueous phase monomer solution for synthesis of a polyamide membrane, and preparing the carboxymethylcellulose sodium composite-filled polyamide nanofiltration membrane by an interfacial polymerization method. With utilization of good hydrophilicity, charge performance and a unique nano pore structure of the composite, the water permeation flux of the membrane is greatly improved while the high selectivity of the polyamide membrane on an inorganic salt is kept. Under an operating pressure of 0.6 MPa, the nanofiltration membrane has the water flux of 50-65 L.m<-2>.h<-1>, has quite high interception rate on divalent ions and the highest reaching 97%, and has the interception rate on monovalent ions of generally less than 25%. Therefore, the prepared carboxymethylcellulose sodium composite-filled polyamide nanofiltration membrane has high separation selectivity and water permeation flux, and has the advantages of simple and feasible membrane preparation method, low cost, and good industrialized application prospects.