66 results about "Methylated cellulose" patented technology

The invention provides high-intensity high-hydroscopicity medical dressing containing carboxymethyl cellulose and a preparation method thereof. The method comprises the following specific steps: preparing carboxymethyl cellulose non-woven fabric through two steps of alkali added aqueous medium process; combining the obtained carboxymethyl cellulose non-woven fabric with a non-woven fabric to form a unit through needling, so as to prepare the high-intensity high-water absorbability medical dressing containing carboxymethyl cellulose. The dressing has the advantages that the substituted ratio of the prepared carboxymethyl cellulose non-woven fabric is controlled among 0.1-.05, and the substitution is uniform; the space physical adsorption property of the carboxymethyl cellulose non-woven fabric is kept, and meanwhile, the chemical adsorption performance is improved; the obtained carboxymethyl cellulose non-woven fabric and the non-woven fabric are compounded to a unit, which improves the dryness strength of the dressing prepared by the invention, beautifies the appearance, and improves the hand feeling. Besides, the method is simple and convenient in preparation technology and lower in cost.

The invention relates to a silicon-base cathode material for a lithium ion battery and a preparation method of the silicon-base cathode material. The preparation method of the silicon-base cathode material comprises the steps that 1) nano silicon powder and hydrochloric acid are mixed, stirred at a room temperature, and then subjected to suction filtration to obtain surface-treated nano silicon powder; 2) a Tris solution is prepared; a dopamine monomer is added to the obtained Tris solution under a nitrogen supply condition; and sufficient stirring is performed to obtain a dopamine solution; and 3) the surface-treated nano silicon powder and the dopamine solution are mixed and sufficiently stirred under a vacuum condition; and then a polymerization reaction is performed in atmosphere to obtain the silicon-base cathode material. According to the method, the nano silicon powder is treated with concentrated hydrochloric acid, a silica oxidation layer is introduced on the surface of the nano silicon powder, and the mechanical strength of the oxidation layer is high, so that a buffer effect is exerted on expansion of the silicon powder. In addition, the silicon powder coating more complete polydopamine is obtained after hydrochloric acid treatment, and CMC (carboxy methylated cellulose) serving as a binding agent and the silicon-base cathode material are used cooperatively, so that the obtained lithium ion battery has better cycle efficiency and initial efficiency.

The invention discloses a method for high-efficiency floatation and separation of molybdenum and nickel and recovery of molybdenum and nickel from high carbon nickel-molybdenum ore to obtain molybdenum concentrate and nickel-molybdenum bulk concentrate. The method comprises the following steps of: selecting raw ore; grinding the ore; performing floatation to remove carbon; performing floatation of molybdenum preferably; and performing nickel-molybdenum bulk floatation, wherein in the step of performing carbon removal floatation, an ore dressing reagent of methyl isobutyl carbinol (MIBC) is used as a carbon substance foaming agent and collector, and water glass and lime are used as a dispersing agent and an ore pulp regulator; in the step of performing floatation of molybdenum preferably, emulsified kerosene is used as a collector for molybdenum mineral, terpenic oil is used as a foaming agent, carboxy methylated cellulose (CMC) is used as an inhibitor for carbonic matters and gangue, and Na2SO3 and lime are used as an inhibitor for nickel mineral and pentlandite; and in the step of performing nickel-molybdenum bulk floatation, ore dressing reagents of butyl xanthate and diethyldithiocarbamate are used as a collector for nickel-molybdenum mineral, terpenic oil is used as a foaming agent, CuSO4 is used to activate the nickel mineral, and sulfuric acid is used as a regulator to regulate the pH value of the ore pulp so as to induce the floatation of the nickel and the molybdenum. In the method, the metallic mineral separating effect is good, the recovery rates of metals are high, and the process flow is easy to control and has high repeatability.

The invention discloses coated copy paper, which comprises a base paper layer and a coating applying to the surface of the base paper layer. The coating is formed by applying a coating material; the coating material is prepared from the following components in parts by weight: adhesives: 1-30 parts of carboxylic butadiene-styrene latex, 1-30 parts of modified starch, 1-30 parts of CMC (Carboxy Methylated Cellulose) and 1-30 parts of PVA (Poly Vinyl Alcohol); a brightener: 0.1-5 parts of sodium hexasulfonate; ink absorbers: 2-25 parts of ultrafine silicon dioxide, 2-25 parts of hollow microspheres and 2-25 parts of titanium dioxide; fillers: 20-60 parts of CaCO3 and 20-60 parts of kaoline; and auxiliaries: 0.1-5 parts of a cationic color fixing agent and 0.1-5 parts of a nonionic color fixing agent. The coated copy paper has the beneficial effects that a production process is simple and the production cost can be reduced, and the key technology is that the ink absorbers are applied as the core of the coating of the coated copy paper and other auxiliaries (various color fixing agents) are the special feature of the coating, and the ink absorbers and the auxiliaries play a decisive and key role in the implementation effect of the coated copy paper.

The invention belongs to the technical field of paper making and relates to a black paper-making coating and a method for producing a black paperboard by utilizing the black paper-making coating. The black paper-making coating is formed by mixing the following components in parts by weight: 10-15 parts of black pigment, 4-5 parts of CMC (Carboxy Methylated Cellulose), 300-450 parts of calcium carbonate, 70-100 parts of kaolin, 15-18 parts of urea, 3-9 parts of hydrophobic agent, 3-10 parts of sodium hydroxide, 3-8 parts of dispersing agent, 3-10 parts of lubricating agent, 1 part of antifoaming agent, 50-240 parts of latex and a proper amount of water. The invention also provides a method for producing the black paperboard by utilizing the black paper-making coating. The black paperboard prepared by the method has the advantages of smooth surface, no stretching or shrinkage and no deformation, favorable printing characteristic, and the like.

The invention relates to a method for preparing coated nano zero valent iron by a rheological phase reaction method, and a prepared product thereof. The method comprises the following steps: adding carboxy methylated cellulose (CMC) liquid medium at the concentration of 0.06g / ml into chemical pure ferrous sulfate and boracic acid which serve as main raw materials in a solid-to-liquid ratio of 1 to 2, performing rheological phase reaction for two hours, washing the product by using absolute ethanol, and distilling and separating to obtain the powdery nano zero valent iron. The preparation method is simple, and is easy to control, and environment-friendly, the steps of ball-milling, sintering and the like are saved, and the product has high environment friendliness, does not cause secondary pollution and can be widely applied to environment treatment and repairing.

The invention relates to the field of genetic engineering, in particular to a method for improving the enzyme activity of cellulose of trichoderma reesei. The method includes a step of expressing exogenous beta-glucosidase genes NfBgl3A in the trichoderma reesei. The method has the advantages that heterogenous beta-glucosidase is expressed in the trichoderma reesei, so that transformants for obviously improving the enzyme activity of the cellulose can be obtained; the enzyme activity of filter paper with the cellulose reaches 0.18 U / ml after the transformants are cultivated in MM-Avicel for 6 days and is improved by 3.7 times as compared with original strains; the enzyme activity of CMC (carboxy methylated cellulose) reaches 0.40 U / ml and is improved by 2.9 times as compared with the original strains.

The present invention provides a method for production of cellulose ethers in a high solids process substantially without use of organic solvents as reaction and / or washing medium. In the method of the invention the first alkalization step is carried out by using high solids content cellulose pulp and solid sodium hydroxide. This is followed by an etherification step where the solids content is preferably further increased and the use of solid etherification reactant is preferred. As no organic solvents are used as reaction media the invented method enables production of cellulose ethers directly from never dried pulp with significant savings in energy and investment costs. The method is especially suitable for the production of carboxymethyl cellulose sodium salt (CMC) with low degree of substitution (DS < 0.3). The use of the resulting none or low water soluble carboxymethylated cellulosic fibres is suitable for example for producing microfibrillated cellulose.

The invention discloses nutritional meal replacement powder with the effect of reducing weight and fat, and a preparation method thereof. The preparation method comprises the following steps of: preparing gelatin and CMC (carboxy methylated cellulose) into enveloped capsaicine by utilizing complex coacervation method, and uniformly and sufficiently mixing the enveloped capsaicine with L-carnitine, resistant starch, konjac flour, soybean peptide and hericium erinaceus polysaccharide in a weight ratio. According to the meal replacement powder, the enveloped capsaicine and the L-carnitine are compounded, the effect of metabolizing fat of the L-carnitine is reinforced by utilizing the characteristics of promoting fat metabolism and controlling appetite of the enveloped capsaicine, the weight reducing function of the L-carnitine can be given a full play, and weight can be reduced more effectively. Furthermore, the body nutrition intake can be strengthened, and digestive health can be protected, the meal replacement powder is compounded of a plurality of food components which can be used for reducing food intake, promoting body fat metabolism and excretion, and replenishing nutrients required by the body and has a good taste. The meal replacement powder has an excellent effect on obesity, overweight and body shaping. Compared with a product with single weight reducing effect or Western medicines with side effects, the meal replacement powder has remarkable advantages, is a novel weight reducing product, and has an bright market application prospect.

The invention relates to a diaphragm containing a non-solid-state electrode for a chemical power supply system. The diaphragm is characterized by being an intermolecular force type ion exchange membrane, which comprises two basic components including a matrix and molecules with ion exchange activity, wherein the two components are bonded by means of intermolecular force, the component of the matrix of the membrane is selected from organic polymer compounds, preferably one or some of PMMA (Polymethyl Methacrylate), PP (Propene Polymer), PE (Poly Ethylene), PVDF (Polyvinylidene Fluoride), PTFE (Polytetrafluoroethylene), PVA (Polyvinyl Acetate), PVC (Polyvinyl Chloride), PAN (Polyacrylonitrile), PEO (Polyoxyethylene Oxide), CMC (Carboxy Methylated Cellulose), starch and polyacrylic acid, and the ion exchange active molecules are selected from micromolecular organic or inorganic acids, alkaline metal and alkali or salt of alkaline-earth metal. The diaphragm only allows alkaline metal ions, alkaline-earth metal ions or hydrogen ions and the like to pass through and doe not allow transition metal ions to pass through. The diaphragm is low in manufacturing cost and easy for industrialization realization, and has potential application values in the fields of flow batteries, air batteries and fuel batteries.

The invention relates to a preparation method of a novel high-sensitivity formaldehyde gas sensor. The preparation method is characterized by comprising the steps of assembling carboxy methylated cellulose (CMC), PDDA, a quantum dot and a bovine serum albumin (BSA) on a glass slide by using a layer by layer self-assembly technology to form a quantum point multilayer film formaldehyde sensor, and carrying out quantitative detection on formaldehyde by using fluorescence change before and after contacting the formaldehyde. An experiment comprises the following steps of 1. preparing a NaHTe precursor to obtain a light red NaHTe liquid; 2. preparing a quantum point wrapped by L-cysteine; 3. preprocessing a quantum point multilayer film carrier quartz plate; and 4. assembling a quantum point multiple film, and carrying out layer by layer self assembling on the PDDA and the quantum point through an electrostatic interaction to obtain the formaldehyde gas sensor. The formaldehyde gas sensor for detecting the formaldehyde is simple in preparation process, excellent in detection effect, easy to actually popularize and apply, low in cost, free of pollution to the environment, and convenient to recycle.

A body shaped wound dressing wherein the dressing is a knitted or woven garment comprising a cellulosic yarn, which garment has been carboxymethylated at least in parts of its wound contacting surface.

The invention discloses a plant polysaccharide medicinal enteric hard-shell capsule. The capsule mainly consists of the following components in percentage by weight: 10-14% of sodium alginate, 1-3% of carboxy methylated cellulose and 1-1.5% of polyethylene glycol PEG-400 in terms of the sodium alginate. Furthermore, the invention discloses a preparation method of the plant polysaccharide medicinal enteric hard-shell capsule. The hollow capsule disclosed by the invention is prepared from plant polysaccharide edible sodium alginate, and the enteric capsule is more stable in performance compared to a gelatin capsule, good in toughness, thin and elastic in film, difficultly becomes broken and difficultly becomes mildewed; the capsule is not dissolved in the stomach within 2 hours and is completely dissolved in the small intestine after half an hour, so as to avoid irritation of some medicines to the stomach or to avoid influence on a medicine efficacy; specifically, the enteric capsule is more suitable for medicines for treating intestinal diseases and for resisting tumors. The enteric capsule disclosed by the invention is simple and reasonable in composition, good in safety performance and easy to manufacture.

The invention relates to half-cooked tapioca pearls and a preparation method thereof, and belongs to the technical field of food processing. The half-cooked tapioca pearls are prepared from the following raw materials: cassava starch, ethyl maltol, caramel pigment, Aspartame, carboxy methylated cellulose (CMC) and water. Compared with the prior art, the half-cooked tapioca pearls have the advantages of 1) convenience, 2) high safety, and 3) chewable performance.

The invention provides carboxymethyl wood flour with high degree of substitution, which consists of the following raw materials by weight: 1 portion of wood flour, 10 to 30 portions of isopropanol, 1.0 to 2.0 portions of sodium hydroxide solution with the concentration of 30 percent, 1.0 to 2.0 portions of chloroacetic acid; the raw materials are etherified, washed with ethanol, pressed and filtered, dried and pulverized, thus getting yellow wood flour rich in carboxymethylated cellulose and hemicellulose with the degree of substitution ranging from 1.0 to 2.2. The carboxymethyl wood flour with high degree of substitution is prepared through the three steps of basification of wood flour, etherealization and preparing the finished carboxymethyl wood flour, which is widely applied in the fields of petroleum, coating, daily use chemicals, foodstuff, textile, papermaking, building materials and so on. Wood flour is used as the main raw material; the hydroxyl groups of the cellulose and hemicellulose in wood flour are comprehensively used; lignin and lignin-polysaccharide complex structure is as cross-linking agents; the timber utilization rate is high; the cost is low; and the carboxymethyl wood flour does not pollute the environment. The degree of substitution of the prepared carboxymethyl wood flour is high, and the carboxymethyl wood flour is insoluble in water.

The invention discloses a making method for rice bran beverage, which successively comprises the following steps: removing impurities from the rice bran; carrying out thermal treatment to remove phytic acid; carrying out biological enzyme hydrolysis and enzyme inactivation; separating clear liquid and emulsion; blending, sterilizing and filling liquid; during enzymolysis, selecting one or more of protease, amylase and tannase; during blending, blending the clear liquid with white granulated sugar, protein sugar, sodium cyclamate, malic acid and citric acid; blending the emulsion; and mixing with the white granulated sugar, the protein sugar, the sodium cyclamate, the malic acid, the citric acid, CMC (Carboxy Methylated Cellulose) and xanthan gum. The obtained beverage has two states of clear liquid and emulsion which both effectively maintain rich nutrition substances, such as protein, fat, bran, vitamins and the like. Meanwhile, the beverage has the fresh rice flavor, is sweet mixed with sour and has excellent taste and has excellent taste.

The invention discloses a paste additive for a lost foam casting coating and a preparation method. The paste additive comprises the following components in parts by weight: suspending agent, 16 to 20 parts of sodium tripolyphosphate, 12 to 16 parts of dextrin, 11 to 15 parts of CMC (carboxy methylated cellulose) powder, 9 to 13 parts of waste paper fiber, 6 to 9 parts of polyvinyl alcohol, 3 to 5 parts of fatty alcohol ether sodium sulfate, 6 to 8 parts of polyoxyethylene polyoxypropylene pentaerythritol ether, and 220 to 300 parts of water, wherein the suspending agent is prepared by compounding 55 to 60 parts of rectorite, 36 to 41 parts of sodium-based bentonite, and 27 to 32 parts of sepiolite. The paste additive has the advantages that the paste additive and fire-refractory aggregate can be mixed at one time, and be stirred, so as to prepare the lost foam casting coating for casting alloys, and the paste additive is suitable for manufacturing at various production sites of lost foam coatings for casting enterprises. The lost foam coating prepared by the additive has the characteristics of good suspending property and smearing property, high coating strength, and the like.

The invention discloses a red date and jasmine tea compound beverage. The beverage is characterized in that a production method of the beverage comprises the steps as follows: the best extraction condition of red date juice is that extraction is conducted at 70-90 DEG C for 50-70 min and the water adding amount is 10-14 times the mass of dates. The best formula of the red date and jasmine tea compound beverage is as follows: 40%-60% by volume of red date juice, 40%-60% by volume of jasmine tea soup, 0.05%-0.15% by mass of critic acid and 5%-9% by mass of sucrose are evenly mixed, 0.07%-0.09% by mass of CMC 9carboxy methylated cellulose), 0.08%-0.12% by mass of xanthan gum and 0.10%-0.14% by mass of sodium alginate are added, the produced red date and jasmine tea compound beverage is orange red in color, fine in taste, palatable in sweetness and pure in flavor.

The invention discloses a method for improving properties of a starch-base edible packaging film by adding hydrophilic colloid. The starch-base edible film is prepared through the steps of uniformly mixing starch with hydrophilic colloid, then pasting, defoaming, forming a film and stripping the film; the method for improving the properties of the starch-base edible packaging film by adding the hydrophilic colloid comprises the steps of mixing starch with carboxy methylated cellulose (CMC) so as to form a starch-CMC compound, then lowering the viscosity, uniformly mixing with the hydrophilic colloid, defoaming, forming a film and stripping the film. The starch film prepared by common natural starch has good flexibility, is difficult to break and has wide application range; the method disclosed by the invention is simple and easy to operate and can completely substitute for the method for preparing the starch film by amylase.

The invention provides a colored pencil lead and a preparation method thereof. The colored pencil lead comprises components in parts by mass as follows: 62-73 parts of sodium thiosulfate, 13-20 parts of a color developing agent, 7-15 parts of CMC (carboxy methylated cellulose) and 0-8 parts of kaolin, wherein the color developing agent consists of sodium carbonate and an acid-base indicator. The preparation method of the colored pencil lead includes steps of weighing the raw materials in proportion, mixing sodium carbonate and the acid-base indicator, adding absolute ethyl alcohol dropwise and mixing to a heavy paste, then pouring molten sodium thiosulfate in and stirring evenly, adding CMC and kaolin, stirring evenly, pouring into a die, drying, and taking out. The provided colored pencil lead can fade both when the lead meets water and when the lead is placed in the air for a long time, is easy to wash when adhering to hands or clothes, is non-residual, non-toxic and harmless, and is suitable for occasions where long-stem storage is not needed, such as temporary marking, calligraphy and painting exercise, and the like.

The invention relates to a manufacturing method in a production technique of paint for casting, in particular to a production technique of sand-type water based paint for casting, wherein the sand-type water based paint belongs to a casting accessory. The production technique comprises the following steps of: adding water, tributyl phosphate and CMC (carboxy methylated cellulose) in a dissolving pot firstly, stirring uniformly, dissolving the materials completely; filtering insoluble materials by a filter screen; adding water, sodium benzoate, a sodium base bentonite suspending agent, acetic acid and reducing glue in a stirring kettle, starting up electric stirring; slowly adding white corundum, sodium lignin sulfonate and water in the stirring kettle, stirring for 15-20min; adding water on the basis of the dilution situation, wherein the baum degree of the paint is higher than 95 after being stirred uniformly; transferring the paint prepared by the steps in a colloid mill, continuously milling for 2h, discharging and packaging into barrels to obtain the paint. The invention provides the novel production technique of the sand-type water based paint for casting, which has the following characteristics of environment friendliness, high coating strength and excellent painting property.

The invention discloses a formula of a positive active material for a lead-acid power battery. The formula is characterized in that sodium peroxide, lead tetraoxide and CMC (Carboxy Methylated Cellulose) are added. The invention also discloses a preparation method of the positive active material. The preparation method comprises the steps of: firstly, mixing and stirring lead powder, lead tetraoxide powder and sodium peroxide powder for 3-5min, then adding the CMC, stirring for 5-8min, adding deionized water, stirring for 8-10min, finally adding sulfuric acid with the specific gravity of 1.05g / cm<3>, stirring for 10-15min, coating a positive plate, and drying the coated positive plate for 4-6h in a drying room with the temperature of 60 DEG C and then performing assembly and battery formation processes.

The invention discloses a preparation method for a lost foam casting coating. The lost foam casting coating comprises a common coating, carboxy methylated cellulose (CMC), white latex, quartz powder, lithium-based bentonite, an active agent and water. The preparation method comprises the following steps that S1, an appropriate amount of water is added to the common coating, and the mixture is put in a coating bucket to be stirred through a mixer for 40-90 min; S2, a Baume meter is used for measuring the proportion of the coating; S3, the CMC is soaked 24 hours in advance; S4, the white latex, the soaked CMC and an appropriate amount of water are poured into the coating bucket to be stirred evenly through a high-speed mixer; S5, the quartz powder is slowly added into the coating bucket, and the mixture is stirred evenly through the high-speed mixer; and S6, the lithium-based bentonite is added into the coating bucket, and the mixture is stirred through the high-speed mixer for 40-60 min. Compared with other coatings, according to the preparation method, the preparation process steps are simplified, the strength of the coating is effectively improved, and the defects such as scrap inclusions, slag inclusions and sand adhesion of a casting due to the fact that in the molten iron casting process, a coating layer of a foam model is liable to fall off to generate coating scraps are overcome.

The invention discloses a high-resistance starch rice milk beverage and a preparation method thereof; the high-resistance starch rice milk beverage comprises the following raw materials: high-resistance starch appropriate sugar rice, skim milk powder, sugar cane, CMC (Carboxy Methylated Cellulose), sodium alginate and sodium citrate. The preparation method comprises the steps of impurity removal, roasting, dipping and defibrination, pasting, enzymatic decomposition, mixing, homogenization and degassing, filling, sterilization and cooling. The high-resistance starch rice milk beverage and the preparation method thereof have the following characteristics: the high-resistance starch appropriate sugar rice is used as the raw material to develop a double-protein beverage with higher content of resistant starch and rich nutrition; after diabetics drink the beverage, the blood glucose can be smoothened, and the symptom of quickly increasing the blood glucose after taking food is improved; the traditional preparation method is improved to solve such problems as low utilization rate of the raw materials, weak flavor, layering and easiness in precipitation in the production process of the rice milk beverage; the high-resistance starch rice milk beverage has mellow rice flavor, properly coordinated milk flavor, pure sweet taste, exquisite and mellow taste and full scorch aroma of baked rice.

The invention provides a polyurethane foam dressing. A preparation method of the polyurethane foam dressing comprises the following steps of taking 100 grams of polyether polyol, 8-10 grams of diethylene glycol, 0.7-1.0 grams of imidazole catalyst, 1-2 grams of silicone oil stabilizer, 3-5 grams of borax and 2-3 grams of water; taking 10-15 grams of self-made CMC (carboxy methylated cellulose) with meshes of 1500 or 10-15 grams of self-made calcium alginate; uniformly mixing the components; and placing the mixture in a mold; and heating to 50+ / -2 DEG C and then foaming for 3-4 hours to obtain medical sponge of which the foam density is 35kg per m(3). The polyurethane foam dressing has the advantages that liquid sucking amount can be increased by 30-50%, slough of a wound can be cleaned, moisture of the wound can be high, a warm therapy method of the wound can be formed, and wound healing is accelerated. Compared with the original PU (poly urethane) sponge, the polyurethane foam dressing has a healing promoting function.

The invention relates to a preparation technology for craft paper in the field of paper making and paint for coating craft paper. The paint for coating craft paper comprises the following components of: kaolin, ground limestone, sodium polyacrylate, nano silica, basalt fibre, CMC (carboxy methylated cellulose), oxidized starch, styrene butadiene latex, an antifoaming agent, a water-proofing agent, antiseptics, a brightening agent, a lubricating agent, a water-resistant agent and appropriate amount of water, wherein the pH value of the paint is regulated to be 6.0-6.6, the solid content is 61-67%, and the paint is configured to coat raw paper. The paint-coated craft paper prepared by the preparation technology for the craft paper has higher smoothness, glossiness and strength and has better illumination resistance and radiation resistance, and the printability is better.

The invention discloses a paper box binding agent which is characterized by comprising the following components in parts by weight: 80-100 parts of an adhesive, 3-5 parts of a catalyst, 1-3 parts of carboxy methylated cellulose (CMC), 5-10 parts of sodium carbonate, 5-10 parts of bentonite and 60-80 parts of deionized water; the invention further discloses the preparation method of the paper box binding agent. According to the paper box binding agent and the preparation method thereof, provided by the invention, the formula of the paper box binding agent is optimized, a reasonable content range is determined, therefore the finally prepared paper box binding agent is endowed with the advantages of high stability, high cohesive strength, high peel strength and adhesive power endurance, and besides, the preparation method is simple and easy to operate, improves the production efficiency and expands the application range of products.

A body shaped wound dressing wherein the dressing is a knitted or woven garment comprising a cellulosic yarn, which garment has been carboxymethylated at least in parts of its wound contacting surface.

The invention discloses a carboxymethylated cellulose nanofibril and a preparation method thereof. According to the carboxymethylated cellulose nanofibril and the preparation method thereof, carboxylation modification pre-treatment is adopted before nanocrystallization treatment, meanwhile, the technological conditions and parameters in the preparation process are optimized, and therefore the energy consumption is reduced, meanwhile, the yield of the carboxymethylated cellulose nanofibril is increased, and the quality of the carboxymethylated cellulose nanofibril is improved. Compared with a traditional inorganic acid hydrolysis method, the preparation method has the advantages that no residual acid exists in a preparation system, so that the pollution of the acid to the environment can beavoided, and dialysis can be carried out without lots of water; compared with a mechanical preparation method without chemical pretreatment, the preparation method has the advantages that the preparation conditions are mild, the operation is simple, the cost is low, and the pollution is small; and the method has a wide industrial application prospect.