61 results about "Sodium chloroacetate" patented technology

The invention provides a preparation method and application of low-bath-ratio and high-viscosity hydroxypropyl carboxymethyl composite starch ether, and relates to the technical field of starch deep processing. The method comprises the following steps: S1, premixing corn starch with a compound base catalyst and magnesium stearate, and spraying an ethanol water solution for alkalization; s2, adding epoxypropane to carry out first-stage etherification, and then adding sodium chloroacetate to carry out second-stage etherification; and S3, after the reaction is finished, performing vacuum drying, crushing and sieving to obtain the high-viscosity hydroxypropyl carboxymethyl composite starch ether. Wherein the composite alkali catalyst comprises sodium hydroxide, sodium carbonate and calcium oxide. The starch ether obtained by the method has the advantages of high substitution degree, high viscosity, low solvent consumption and low energy consumption, and overcomes the defects of the traditional semi-dry method.

The invention relates to the technical field of biological medicine, and discloses a culture medium for human metapneumovirus and application, the culture medium comprises the following components by mass: 850-920 parts of a basic culture medium; the metabolism reprogramming module is prepared from the following components in parts by weight: 0.05 to 0.15 part of 5-methyltetrahydrofolic acid, 0.3 to 0.7 part of N-acetyl-D-mannosamine and 1.0 to 3.0 parts of sodium dichloroacetate; the immune regulation and control module is prepared from 0.005 to 0.015 part of an RIG-I / MAVS pathway inhibitor; the receptor induction module is prepared from 0.5 to 1.5 parts of all-trans retinoic acid; the redox balance module is prepared from the following components in parts by weight: 0.1 to 0.5 part of pegylated superoxide dismutase and 0.002 to 0.008 part of sodium selenite. According to the method, the proportion of infectious virus particles can be remarkably increased, the generation of defective particles is reduced, meanwhile, the production cycle of host cells is prolonged, large-scale continuous culture is supported, and a high-quality and high-efficiency solution is provided for industrial production of gene therapy vectors and virus vaccines.

The invention discloses an efficient wetting and agglomeration composite dust suppression material and a preparation method and application thereof.The preparation method includes the following steps that 1, water, artemisia seed gum and ethyl alcohol are added into a container and stirred to be uniform, then a NaOH solution is dropwise added, alkalization is conducted for 30 min to 1 h, and a mixed solution I is obtained; (2) adding sodium chloroacetate and epoxypropane into the mixed solution I, heating to react until the reaction is complete, cooling the mixed solution to room temperature, and dropwise adding hydrochloric acid while stirring to neutralize until the pH is neutral, so as to obtain a mixed solution II; and (3) adding polyacrylamide into the mixed solution II, heating to react until the reaction is complete, and adding a surfactant to obtain a dust suppressant solution. The dust suppressant has efficient wetting and coagulation effects, the anti-interference capability of a consolidation layer is improved, water evaporation is effectively slowed down, and the action time of the dust suppressant is prolonged.

The invention relates to the technical field of chemical engineering, and discloses a hydrogen peroxide stabilizer and a preparation method thereof.The stabilizer is obtained in the mode that alpha-chlorinated acrylic acid and functional monomers are subjected to free radical polymerization and then hydrolyzed; the functional monomer is obtained by firstly carrying out ammonolysis reaction on diethylenetriamine and allyl glycidyl ether to obtain an intermediate, then mixing the intermediate with sodium chloroacetate and carrying out reaction under an alkaline condition, and by introducing the functional monomer containing the carboxylic acid group, the stability of hydrogen peroxide is improved; and invalid decomposition caused by metal ion catalysis is reduced.

The invention discloses a high-barrier anti-permeation packaging bag and a processing method thereof, and relates to the technical field of packaging bag preparation. Comprising the following raw materials in parts by mass: 150 to 200 parts of deionized water, 50 to 70 parts of polyvinyl alcohol, 3 to 5 parts of modified montmorillonite, 7.5 to 10.5 parts of carboxylated cellulose nanofiber, 3 to 8 parts of zinc-doped mesoporous silica, 3 to 5 parts of a synergist, 5 to 10 parts of glycerol and 0.25 to 0.35 part of glutaraldehyde. By introducing the synergist prepared from sodium chloroacetate, triethylamine, calcium chloride dehydrate and the like, the water vapor and oxygen barrier capacity and the antibacterial capacity of the packaging bag can be effectively improved; and due to the introduction of the modified montmorillonite, the carboxylated cellulose nanofiber, the zinc-doped mesoporous silica and other components, the water vapor and oxygen barrier ability and the antibacterial ability of the packaging bag are further improved. Therefore, the method has a wider application prospect.

The invention discloses an etherified-esterified composite starch emulsifier and a preparation method thereof. The etherification-esterification composite starch emulsifier is prepared by the following steps: adding an alkalizer accounting for 10-30% of the mass of a starch dry basis into starch, uniformly mixing, and placing in a drying oven at 30-50 DEG C for 0.5-2 hours to obtain a mixture; adding sodium chloroacetate into the mixture, uniformly mixing, and standing for 0.5-3 hours; adding fatty acid, uniformly mixing, and standing for 12-48 hours to obtain a reaction material; loading the reaction material into a ball milling tank of a stirring ball mill, adding a ball milling medium with the diameter of 4-8mm, stirring and reacting at 35-65 DEG C for 10-120 minutes, and separating the ball milling medium after the reaction is finished to obtain a reaction product; and soaking the reaction product with 70-95% ethanol to obtain the product. The etherification substitution degree of the etherification-esterification composite starch emulsifier reaches 0.3495 or above, the substitution degree can reach 0.00865 or above, the reaction efficiency reaches 32%, the emulsifying property reaches 92% or above, the emulsifying stability reaches 85% or above, and the emulsifying property is excellent.

The present application relates to a kind of preparation method of trifluoromethyl pyrazole compound, belong to the technical field of organic synthesis.The specific method is: (1) trifluoroacetyl ethyl acetate is first with hydrazine hydrate cyclization reaction and generates compound of formula III;(2) under the catalysis of base, compound of formula III is reacted with difluoromethylation reagent and generates compound of formula II;(3) compound of formula II is reacted with methylating agent and obtains compound of formula I;The difluoromethylation reagent is difluoro-monochloromethane or sodium difluoro-monochloroacetate;The methylating agent is chloromethane, bromomethane, iodomethane, dimethyl sulfate or dimethyl carbonate.The present application is prepared by changing reaction route, and the higher-priced raw material methylhydrazine is replaced, and isomer impurity is no longer generated in the product prepared.Not only raw material cost is reduced, but also the purity of product is improved.

The present invention relates to the technical field of surfactant preparation, and discloses a fatty alcohol polyoxyethylene ether carboxylate and a preparation method thereof, the fatty alcohol polyoxyethylene ether carboxylate comprises the following raw materials: AOE-9, a sodium hydroxide saturated solution and sodium chloroacetate, the molar ratio of AOE-9 to sodium hydroxide to sodium chloroacetate is 1-2: 0.5-1.5: 1-2, and the molar ratio of AOE-9 to sodium hydroxide to sodium chloroacetate is 1-2: 0.5-1.5: 1-2. The sodium hydroxide needs to be prepared into a sodium hydroxide saturated solution, and the saturation concentration of the sodium hydroxide saturated solution is 52%. According to the invention, through reasonable material ratio and accurate reaction condition control, the reaction process has high self-cleaning property, from raw material feeding to product generation, the steps are closely linked, the reaction is sufficient, the generated impurities are less, and in the reaction process, the reaction yield is high through nitrogen protection, accurate temperature control and reasonable feeding mode. Therefore, the structure of the product is relatively single and stable, and the quality problem caused by impurities or unstable structures is not easy to generate in the reaction process.

The invention discloses a dust suppression material based on calcium slow-release crosslinking. The dust suppression material comprises 2-6 parts of xylan, 9-85 parts of sodium chloroacetate, 0.12-0.85 part of calcium chloride, 0.6-1 part of citric acid, 1-2 parts of ethyl lactate, 24-56 parts of a basifier, 1-9 parts of a wetting agent and 1500-3000 parts of distilled water. Xylan is modified through carboxymethylation reaction, a calcium slow-release system is constructed to control the release rate of Ca < 2 + >, slowly released Ca < 2 + > is wrapped by carboxyl of adjacent xylan chains to form local crosslinking points, Ca < 2 + > serves as a molecular bridge, and linear molecular chains are connected into a stable three-dimensional network; the prepared dust suppression material has high wetting and permeability, high bonding strength, high water-retaining property, high environmental durability and a long-acting dust suppression effect.

The present application relates to a method for preparing a modified starch bio-based slurry, and a product and the use thereof. The preparation method comprises the following steps: mixing starch, a bio-based emulsifier, an alkaline solution and sodium chloroacetate, then reacting the resulting mixture to obtain a reactant, adjusting the pH of the reactant to 5-8, and then filtering and washing same to obtain the modified starch bio-based slurry, wherein the bio-based emulsifier is cardanol polyoxyethylene ether. The hydroxyl on starch in the present application is activated under the catalytic action of an alkali and then reacts with an etherifying agent, such that a carboxymethyl group is introduced to a starch molecular chain; in addition, a specific bio-based emulsifier is added during the process, which can facilitate better penetration of the alkali and sodium chloroacetate inside the starch and improve the reaction efficiency, thereby enhancing the stability of the reaction product and the performance of a slurry film.

The present invention provides a method for preparing a quaternary ammonium salt of methenamine, which can be quickly prepared and accurately detected under relatively mild preparation conditions. The method includes a preparation method and a detection method. Preparation steps: (1) adding methenamine and sodium chloroacetate (or other halogenated organic carboxylic acid metal salt) to a reaction solvent, stirring to mix them evenly, and maintaining a certain temperature for reaction; (2) after the reaction is completed, separating the solid and the liquid, and drying the solid to obtain the quaternary ammonium salt of methenamine. Detection steps: (3) grinding the prepared quaternary ammonium salt of methenamine into fine particles, dissolving it in water to prepare a solution; (4) using high performance liquid chromatography to detect the product solution and analyze the purity. According to the embodiment, the yield of the prepared quaternary ammonium salt of methenamine is not less than 90%, and the purity is as high as 97%.

The invention relates to a temperature-sensitive-pH dual-response environment-friendly color fixing agent for hemp as well as a preparation method and application of the color fixing agent. The color fixing agent is prepared from the following raw materials: chitosan, N-isopropylacrylamide, a sodium hydroxide solution, ammonium persulfate, 2, 3-epoxypropyltrimethylammonium chloride, sodium chloroacetate, a dispersing agent and pure water. Chitosan is used as a base material, carboxymethyl, N-isopropylacrylamide chain segments and cationic quaternary ammonium salt groups are sequentially introduced through graft polymerization and chemical modification, a dispersing agent is compounded, and the color fixing agent is prepared and has the temperature and pH dual response characteristics, specifically, when the temperature is higher than the low critical solution temperature, the temperature-sensitive chain segments shrink, and dye is physically coated; under the acidic condition, the cationic group and the anionic dye generate electrostatic adsorption, the two mechanisms have a synergistic effect, the color fixing agent is applied to bast fiber to remarkably improve the color fixing effect, the raw materials of the color fixing agent are environment-friendly, and the preparation process is simple.

The invention belongs to the technical field of oil exploitation, and particularly relates to an oil-displacing agent for improving recovery efficiency and a preparation method of the oil-displacing agent. The preparation method comprises the following steps: (1) sequentially adding 2-[(tri (hydroxymethyl) methyl) amino]-1-sodium ethanesulfonate, DMF (Dimethyl Formamide) and bromoalkane into a first reactor, carrying out a heat preservation reaction, and maintaining the pH value of a mixed solution to be 8-9 by using a sodium hydroxide solution during the reaction; carrying out reduced pressure distillation on the reaction liquid until the reaction liquid is dry to obtain a viscous solid, transferring the viscous solid into a high-pressure reaction kettle by using toluene, adding a catalyst, purging the reaction kettle by using nitrogen, vacuumizing, introducing epoxypropane, and heating for reaction; and after the reaction is finished, transferring the mixed solution into a second reactor, adding 1 mol / L of DMF solution of sodium chloroacetate, heating and refluxing, and carrying out reduced pressure distillation on the mixed solution to obtain the product oil-displacing agent. The oil-displacing agent disclosed by the invention has the advantages of low interfacial tension and good emulsification and viscosity reduction effects.

The invention discloses a multi-effect fluid ion regulating agent and a preparation method thereof. The structural formula of the multi-effect fluid ion regulation and control agent is as shown in formula I, R is linear alkyl or naphthenic base, and the number of carbon atoms is 2-8; m represents the number of substituted acetic acid on amido and is 1-3; and n represents the number of amino groups and is 1-2. An amine compound and sodium chloroacetate are subjected to a substitution reaction to prepare a multi-effect fluid ion regulation and control agent; according to the processing technology provided by the invention, the yield of the ion regulation and control agent can reach 80% or above; the maximum binding rate of the multi-effect fluid ion regulation and control agent to divalent ions such as Ca < 2 + > and Mg < 2 + > is 85%, and the particle size of coalescence particles is controllable between 800 nm and 2400 nm; the one-dose multi-effect fluid ion regulation and control agent provided by the invention has the effect of improving the crude oil recovery rate, and the recovery rate can be improved by 12.5%. # imgabs0 #

The invention provides a foaming agent with anti-corrosion and anti-scaling functions for oil and gas exploitation and a preparation method of the foaming agent, and relates to the technical field of material science and engineering. The preparation method comprises the following steps: mixing isophorone diisocyanate, polycaprolactone diol, castor oil, 2, 2-dimethylolbutyric acid, dibutyltin dilaurate and methyl methacrylate to obtain a first mixture; adding hydroxyethyl acrylate into the first mixture to obtain a second mixture; adding a predetermined solution into the second mixture to obtain a third mixture; dropwise adding a potassium persulfate aqueous solution into the third mixture to obtain a polyurethane acrylate composite emulsion; mixing the polyurethane acrylate composite emulsion with isopropyl alcohol to obtain a fourth mixture; and mixing the fourth mixture, amide tertiary amine, sodium chloroacetate, a scale inhibitor and a condensation point regulator to obtain the foaming agent for oil and gas exploitation. The foaming agent for oil and gas exploitation has the anti-corrosion and anti-scaling functions.

The invention relates to the technical field of label paper, in particular to high-viscosity self-adhesive label paper and a preparation method thereof. The adhesive layer of the label paper is constructed by the following steps: performing sodium chloroacetate carboxymethylation and itaconic acid aza-Michael addition dual modification on branched polyethyleneimine, grafting dopamine to introduce a catechol functional group and form a coordination node with ferric iron, and compounding with a polyvinyl alcohol-borate dynamic reversible network to obtain the label paper. And finally, carrying out electrostatic compounding with poly (diallyldimethylammonium chloride) at an isoelectric point. According to the design, the adhesive layer has high peel strength and aging resistance in a dry state, can be quickly softened after meeting water and can be completely removed in an interface debonding manner, so that the residual adhesive rate and the substrate damage risk are remarkably reduced, and the problem that high adhesion and removability are difficult to consider at the same time is solved.

The invention belongs to the technical field of fine chemical engineering, and particularly relates to a preparation method of tetrasodium glutamate diacetate. The preparation method comprises the following steps: (1) dissolving sodium glutamate with deionized water, and then adding a sodium hydroxide solution for neutralization to obtain a disodium glutamate solution; (2) dissolving chloroacetic acid with deionized water, and adding a sodium hydroxide solution for neutralization to obtain a sodium chloroacetate solution; and (3) mixing the disodium glutamate solution obtained in the step (1) with the sodium chloroacetate solution obtained in the step (2), carrying out a condensation reaction under gradient temperature and alkaline conditions, after the condensation reaction is completed, continuing heating to carry out a hydrolysis reaction, and after the reaction is completed, carrying out vacuum concentration, filtering and desalting to obtain the tetrasodium glutamate diacetate solution. Through gradient control of temperature and alkaline reaction conditions, the synthesis efficiency of the tetrasodium glutamate diacetate can be remarkably improved, and the product quality can be improved.

The invention discloses a cross-linked covalent bond coupled carboxymethyl plant fiber as well as a preparation method and application thereof, and belongs to the technical field of plant fiber modified materials. The preparation method of the fiber comprises the following steps: carrying out alkalization treatment on plant fiber to obtain an alkalized material; preparing an alkaline ethanol solution and an ethanol solution of sodium chloroacetate; uniformly mixing a cross-linking agent, an alkaline ethanol solution, an ethanol solution of sodium chloroacetate and the alkalized material, heating to react, and washing the obtained material to obtain the cross-linked covalent bond coupled carboxymethyl plant fiber. According to the preparation method provided by the invention, under the condition of guaranteeing the carboxymethyl content, the water solubility of the fiber is reduced, and the obtained product has very good cation exchange capacity; meanwhile, the crosslinked covalent bonds reconstruct the aggregation state structure of the cellulose fibers, so that the defect of moisture absorption deformation of the fibers is overcome, and the water filtering performance of the non-woven filtering material is effectively improved. The technical means promotes construction of petroleum-based ion exchange fiber green substitutes.

The invention discloses a preparation method of a GLOD modified HGO-COOH / TOCNF nano channel membrane, and belongs to the technical field of membrane science. The preparation method comprises the following steps: preparing a graphene oxide aqueous dispersion, adding inorganic alkali and sodium chloroacetate for reaction, and neutralizing with diluted hydrochloric acid to obtain carboxylated graphene oxide; preparing a carboxylated graphene oxide suspension, and etching through an etching agent to obtain carboxylated porous graphene oxide; preparing a TOCNF aqueous dispersion, and mixing the TOCNF aqueous dispersion with the carboxylated porous graphene oxide aqueous dispersion to obtain an HGO-COOH / TOCNF mixed solution; adding EDC, NHSS and GLOD into the mixed solution for reaction to obtain dispersion liquid; the GLOD-modified HGO-COOH / TOCNF nano-channel membrane is prepared by the steps of preparing a GLOD-modified HGO-COOH / TOCNF nano-channel membrane, performing suction filtration on the dispersion liquid to obtain the GLOD-modified HGO-COOH / TOCNF nano-channel membrane, providing abundant transmission paths for ion transmission by virtue of the porous characteristic of the membrane structure, and

The invention discloses a lauryl betaine preparation method, which comprises: 1, preparing sodium monochloroacetate: adding 30-40 g of monochloroacetic acid into a three-neck flask provided with a thermometer and a stirrer, adding a proper amount of water to dissolve, uniformly stirring, slowly adding 240-280 g of a 20% alkaline solution into the monochloroacetic acid solution, stirring while controlling the pH value to be 6.5-7.0, and carrying out a reaction for 2-3 h to obtain sodium monochloroacetate; the reaction temperature is controlled below 60 DEG C until the neutralization is complete; 2, 60-75 g of dodecyl dimethyl tertiary amine is added into the sodium monochloroacetate solution to ensure complete dissolution, the temperature of a reaction system is controlled to range from 60 DEG C to 85 DEG C to react for 5-12 h in an oil bath provided with a temperature controller, 50 ml of 80% ethanol solution is added, and full stirring is conducted; 3, after the reaction is completed, the solution is naturally cooled to the room temperature. Filtering, washing and drying to obtain lauryl betaine, and distilling to obtain purified lauryl betaine. By coordinating the specific reaction conditions and process in the preparation process, the content of active substances in lauryl betaine is high, and the appearance reaches the standard.

The present invention relates to the technical field of petroleum engineering and chemical processing equipment, and particularly relates to a surfactant preparation system suitable for clean fracturing fluid; it includes a reaction kettle, which is used to add tertiary amine and chloroacetic acid solution for mixing reaction; and the mixture of tertiary amine and chloroacetic acid solution in the reaction kettle is added into a distillation column through a delivery pump for distillation and stratification. In the present invention, first, the tertiary amine and chloroacetic acid solution are mixed, stirred vigorously, and heated to the reflux temperature for distillation to form an emulsion; the emulsion has a certain stability, that is, it will not immediately stratify even if the stirring is stopped; then sodium hydroxide solution is slowly added to the emulsion to react with the emulsion in situ to generate sodium chloroacetate, which undergoes a quaternization reaction with the tertiary amine, capable of inhibiting the hydrolysis of sodium chloroacetate and improving the final yield of the surfactant; and as the reaction proceeds, the generated betaine also acts as an emulsifier, and no organic solvent needs to be added during the preparation process.

The invention relates to the technical field of organic synthesis, in particular to a process for synthesizing sodium sarcosinate by using micro-channel continuous flow, which comprises the following specific steps: S1, pretreating raw materials, preparing 30-50wt% of sodium chloroacetate aqueous solution, and filtering; drying the methylamine gas, and storing under a stable pressure; preparing 32wt%-48wt% of a sodium hydroxide aqueous solution; s2, continuous mixing and pre-reaction: pumping the sodium chloroacetate aqueous solution and the methylamine gas into a micro-channel mixer according to a molar ratio of 1: (1.25-1.6), and controlling the temperature to be 20-30 DEG C and the retention time to be 1-3 minutes to obtain a pre-reaction solution; s3, main reaction; s4, neutralizing and removing impurities; s5, concentration and crystallization; and S6, separation and drying: carrying out solid-liquid separation on the crystal suspension, and then carrying out vacuum drying to obtain a sodium sarcosinate finished product. According to the invention, a micro-channel continuous flow process is adopted, continuous operation of the whole process of sodium sarcosinate synthesis is realized, batch feeding and discharging are not needed, and the occupied area of equipment and the investment cost are greatly reduced.

The invention belongs to the field of water-absorbent resin materials, and particularly relates to multifunctional water-absorbent resin based on traditional Chinese medicine residue components, a preparation method and application. The preparation method comprises the following steps: S1, cleaning, drying and crushing traditional Chinese medicine residues, and sieving to obtain traditional Chinese medicine residue powder; s2, soaking the traditional Chinese medicine residue powder by using a NaOH solution; heating in a water bath, adding a NaOH solution with the concentration of 15%, stirring and mixing, and carrying out alkalization reaction to obtain an alkalized solution; s3, heating the alkalized solution, then rapidly dropwise adding a sodium chloroacetate aqueous solution, carrying out etherification reaction to obtain an etherified solution, drying the etherified solution, and extracting fiber wood components in the medicine residues; s4, mixing the fiber wood component, an acrylic monomer, a cross-linking agent and an initiator, and carrying out polymerization reaction to generate super absorbent resin with a hydrophilic group; s5, extracting aroma components from the traditional Chinese medicine residues to prepare essential oil for later use; and S6, compounding the essential oil and the super absorbent resin to prepare the multifunctional water-absorbent resin based on the traditional Chinese medicine residue components.

The invention belongs to the field of pharmaceutical chemicals, and discloses a preparation method of an anti-HIV (Human Immunodeficiency Virus) drug intermediate, which comprises the following steps: by taking L-phenylalanine as a raw material, synthesizing (3S)-3-(t-butyloxycarboryl) amino-1-chloro-4-phenyl-2-butanone through the steps of amino protection reaction, chloroacetate Claisen condensation reaction and the like. Cheap sodium chloroacetate is adopted as a key reagent for homogeneity of methyl ester, compared with a traditional preparation process, the method has the advantages of being simple in process operation, low in safety risk, small in three-waste emission, low in production cost, high in total yield and the like, used raw materials and intermediate products are low in toxicity, low in price and easy to obtain, industrial production is easier to achieve, and the production efficiency is improved.

The invention discloses an end-capped polyether ester defoaming agent with low surface tension and a preparation method thereof, and relates to the technical field of defoaming agents. The low-surface tension terminated polyether ester defoaming agent is prepared from the following raw materials in parts by weight: 60 to 70 parts of polyether ester, 3 to 5 parts of an emulsifier, 2 to 3 parts of silicon dioxide, 1 to 3 parts of a dispersing agent and 5 to 10 parts of deionized water. The emulsifier reacts with oleyl alcohol through N-dodecyl succinic anhydride to generate an ester compound; generating an epoxy compound from the ester compound under the action of formic acid and H2O2; reacting the epoxy compound with N-dodecyl methylamine to generate a tertiary amine compound; and reacting the tertiary amine compound with sodium chloroacetate to generate the surfactant. The low-surface tension end-capped polyether ester defoaming agent prepared by the preparation method disclosed by the invention has relatively low surface tension and good defoaming performance and stability performance.

The invention discloses high-substitution-degree carboxymethyl cellulose and digital printing paste based on the carboxymethyl cellulose, and belongs to the technical field of cellulose ether. The preparation method of the high-substitution-degree carboxymethyl cellulose comprises the following steps: a, mixing the refined cotton with the banana peel cellulose; b, adding a sodium hydroxide solution and an ethanol-isopropanol mixed solvent into the reaction kettle, uniformly mixing, and adding the cellulose mixture for alkalization; then adding sodium chloroacetate and chloroacetic acid, and carrying out etherification reaction; adding a sodium hydroxide solution, heating and continuing etherification; and after the reaction, cooling to room temperature, neutralizing to be neutral with acid, and carrying out suction filtration, washing and drying to obtain the high-substitution-degree carboxymethyl cellulose. According to the method, the high-substitution-degree carboxymethyl cellulose is prepared by improving the method and is used as a raw material to prepare the digital printing paste, and the digital printing paste has the characteristics of high paste removal rate, high printing definition, high color yield, high base paste stability and the like, and is more suitable for acidic digital printing.

The invention relates to the technical field of high polymer materials, in particular to a flame-retardant anti-aging composite material and a preparation method thereof. Comprising the following components in parts by weight: 60-80 parts of nylon resin, 15-25 parts of filler, 5-18 parts of a halogen-free flame retardant, 3-7 parts of a solubilizer, 2.1-3.5 parts of a lubricant, 0.6-1.2 parts of an antioxidant, 0.5-2.4 parts of a light stabilizer and 1-3 parts of a plasticizer, the halogen-free flame retardant is an alkali lignin-based nitrogen-phosphorus flame retardant, the alkali lignin-based nitrogen-phosphorus flame retardant is prepared by performing carboxymethylation modification on industrial alkali lignin through sodium chloroacetate to prepare water-soluble carboxymethyl alkali lignin, and taking glyoxal, urea and melamine as raw materials to synthesize melamine urea-formaldehyde resin. And then compounding the carboxymethyl alkali lignin, melamine urea-formaldehyde resin and diammonium hydrogen phosphate to prepare the water-retaining agent. The material has the advantages of high mechanical strength, good balance between rigidity and toughness, and excellent high-temperature performance and chemical resistance.

The application discloses a cationic modified rosin anion rosin size with charge reversal stability and a preparation method and application thereof, and belongs to the technical field of anion rosin size. The rosin size is composed of the following raw materials in parts by mass: rosin 100-200 parts; epichlorohydrin 30-90 parts; trimethylamine 3-7 parts; tetrabutylammonium bromide 0.5-1 part; anion starch emulsifier 5-8 parts, sodium dioctyl sulfosuccinate 5-8 parts; defoaming agent 0.5-2 parts; and water 100-240 parts; wherein the anion starch emulsifier is prepared by reacting cassava starch and sodium chloroacetate under alkaline conditions. The modified rosin liquid and the anion emulsifier are emulsified by using a high-temperature normal-pressure phase inversion method to prepare the cationic modified rosin anion rosin size based on the charge reversal stability, and the cationic modified rosin anion rosin size has the characteristics of no chloropropanol, no organic chlorine and good stability, and can realize acid to neutral sizing.

This application provides a method for preparing and applying a low-bath-ratio, high-viscosity hydroxypropyl carboxymethyl composite starch ether, relating to the field of starch deep processing technology. The method includes: S1, premixing corn starch with a composite alkali catalyst and magnesium stearate, and spraying the mixture into an ethanol-water solution for alkalization; S2, adding propylene oxide for a first-stage etherification, followed by adding sodium chloroacetate for a second-stage etherification; S3, after the reaction, vacuum drying, pulverizing, and sieving to obtain the high-viscosity hydroxypropyl carboxymethyl composite starch ether; wherein the composite alkali catalyst comprises sodium hydroxide, sodium carbonate, and calcium oxide. The starch ether obtained by this method has a high degree of substitution, high viscosity, low solvent consumption, and reduced energy consumption, overcoming the shortcomings of traditional semi-dry methods.