46results about How to "Many active groups" patented technology

The invention relates to an inorganic-modified chitosan composite type polymeric flocculant. The inorganic-modified chitosan composite type polymeric flocculant is characterized in that a method for preparing the composite type polymeric flocculant comprises the following steps of: taking polyacrylamide-modified chitosan as a raw material and methacryloyloxyethyl trimethyl ammonium chloride, maleic acid and ceric ammonium nitrate as initiators, synthesizing a modified chitosan copolymer under a faintly acidic condition and blending the modified chitosan copolymer with polymerized ferric chloride and polymerized aluminium chloride to obtain the inorganic-modified chitosan composite type polymeric flocculant. According to the steps, the mass ratio of modified starch to the chitosan is (1-2): 1, the reaction temperature is 50-60 DEG C, the reaction time is 2-3 hours, and the use amount of the initiators accounts for 0.02 part of the total mass of the system. The inorganic-modified chitosan composite type polymeric flocculant prepared by using the method has the characteristics of high efficiency, low cost and low secondary pollution to environment; and aiming at different sludges, compared with a conventional flocculant, the inorganic-modified chitosan composite type polymeric flocculant disclosed by the invention has the advantages that the wastewater decoloring rate and the wastewater deturbidity rate can reach more than 99 percent under the condition of low use amount.

A process for preparing high-capacity microreticular agarose gel medium includes such steps as dispersing the granular calcium carbonate as hole-forming agent in the aqueous solution of agarose to obtain suspension, adding it to salad oil, adding emulsifier Span80, emulsifying while stirring, quick cooling for sphericizing, adding epoxy chloropropane, cross linking, reducing with sodium borohydride, and using diluted hydrochloric acid to remove granular calcium carbonate.

The invention relates to a soilless culture medium and particularly relates to a soilless culture medium for vegetables. A preparation method of the soilless culture medium is characterized by comprising the following steps: uniformly mixing solid materials to obtain a solid medium; spraying a nutrient solution to the solid medium and uniformly mixing to obtain materials, placing the materials at 15-30 DEG C for 13-15 days, and naturally fermenting to obtain the soilless culture medium, wherein the solid materials comprise the following components in parts by weight: 2-3 parts of thoroughly decomposed furfural residues, 2-3 parts of thoroughly decomposed corn stalks, 0.5-1 part of perlite, 1-2 parts of vermiculite, 2-3 parts of furnace clinker, and a ratio of the nutrition solution to the substrate is (1-2) to 50. According to the soilless culture medium of the vegetables disclosed by the invention, the raw materials and the method are unique, the yield of the vegetables can be increased, the amount of pesticides can be reduced, the resource cyclic utilization is realized, and the production cost is lowered.

The invention relates to a preparation method of biomass carbon adsorption material, and belongs to the technical field of environment-friendly materials. According to the invention, plant straws aresubjected to a trace of gasification treatment, part of structures of cellulose, lignin and the like in the plant straws can be removed in the gasification treatment process, so that the straw is enabled to be fluffy and the surface of the straw is enabled to have abundant active groups, meanwhile, ammonium hydrogen carbonate is added to form pores and expande porosity, and then mixed with sodiumsilicate which is used for supplying silicon source, so that sodium silicate is loaded in the straw pores, mesoporous nano-silica is formed through action of effect to fill the pores in the straws soas to improve adsorption capacity and adsorption effects of the straws, then mixed with oleic acid, oleic acid is adsorbed in the straws through adsorption of the straws so as to improve the adsorption property of biomass carbon to heavy metal ions, therefore the problems of poor removal efficiency and low adsorption capacity of the biomass carbon adsorption material to the heavy metal ions at present are effectively solved.

The invention relates to an inorganic and modified chitosan composite polymer flocculant. The inorganic and modified chitosan composite polymer flocculant is characterized in that chitosan which is modified through polyacrylamide serves as the raw material, methacryloyloxyethyl trimethyl ammonium chloride, maleic acid and ceric ammonium nitrate serve as initiating agents, modified chitosan copolymer is synthesized under the weakly acidic condition, and the modified chitosan copolymer, polymerization ferric chloride and aluminum polychlorid are mixed together to prepare the composite polymer flocculant. In the preparation steps, the mass ratio of modified starch to the chitosan is 1-2 to 1, the reaction temperature ranges from 50 DEG C to 60 DEG C, the reaction time ranges from 2 h to 3 h, and the dosage of the initiating agents accounts for 0.02 part of the total mass of the whole system. The inorganic and modified chitosan composite polymer flocculant prepared through the method has the advantages of being efficient, low in cost and small in secondary pollution to the environment; according to sewage with different types, compared with a conventional flocculant, by means of the inorganic and modified chitosan composite polymer flocculant, the sewage decolourization ratio and the removal rate of turbidity can reach above 99 percent under the condition that the use amount of the flocculant is less.

The invention discloses a preparation method of a leaf vegetable nano leaf fertilizer. According to the method, raw materials are smashed and decomposed into nano-scale materials through high-temperature stirring, electron beam irradiation and ultrasonic treatment based on lignin containing a net structure and active radicals in papermaking black liquid, and the adsorptive property of the lignin is increased, so that a phosphate fertilizer, a nitrogen fertilizer, a potash fertilizer, imino disuccinate chelated microelements, two conditioners such as rapin and biochemical fulvic acid and nanometer titania are adhered and bonded together to prepare the leaf vegetable nano leaf fertilizer. The preparation technology is simple, low in cost and high in controllability, the prepared leaf vegetable nano leaf fertilizer is scientific in proportioning of the raw materials and high in total nutrient content, the product is mixed with water, the mixture is sprayed and applied onto leaves of leaf vegetables, so that on one hand, nutrients of the leaf fertilizer can be fixed on the leaves, drifting, leaching loss and evaporation of the fertilizer are reduced, on the other hand, nutrient absorption and movement inside the leaves of the leaf vegetable fertilizer can be promoted, and the absorption and utilization rate is high.

The invention relates to a method of extracting biochemical fulvic acid from papermaking black liquid through biological fermentation. The method includes the steps that papermaking black liquid is fermented through microorganism, lignin, hemicellulose and other macromolecular substances in the papermaking black liquid are biologically degraded, the macromolecular substances are decomposed into micromolecular active substances, the content of active groups is increased, and biological activity is improved. Compared with papermaking black liquid which is not subjected to biological fermentation, the extraction rate of biochemical fulvic acid is increased by 10-25%. The problem of treating wastewater of a paper mill is solved, capital for treating the wastewater is saved for a papermaking enterprise, production cost is reduced, and the environment is protected. The papermaking black liquid is used in a resource mode for producing high-quality biochemical fulvic acid which has a good stimulating effect on plants, and the method plays an important role in guiding agricultural production and has wide application prospects.

The invention discloses a preparation method of water-soluble rare earth luminous nanocrystallines with functionalized surfaces, and belongs to the technical field of preparation of inorganic nanomaterials. The preparation method includes utilizing a pot of water to realize thermal reaction; and modifying water-soluble biopolymers to surfaces of rare earth particles during forming of crystal nucleus of rare earth materials so as to obtain water-soluble rare earth nanomaterials. The preparation method is low-cost, easy and convenient, environment-friendly and universal and is applicable to direct surface functionalization of rare earth inorganic materials in different shapes and different particle sizes. The rare earth nanocrystallines prepared by the method are uniform in size, high in crystallinity and fluorescence intensity and good in dispersibility, can be stably preserved in water for five months at least, have rich active groups on the surfaces and have good biocompatibility and a good coupling property, and accordingly are significant in applications of biofluorescence imaging, medical diagnosis and the like.

The invention discloses a making method of new-typed natural organic macromolecular flocculant, which comprises the following steps: adopting corn starch as main raw material and cerium sulfate as initiator; using the copolymer of ammonium chloride and acetic anhydride with weight rate at 2: 1-1: 2 as cation monomer modifier to react under 10-45 deg.c for 20-50min; setting the weight rate of corn starch and cation monomer at 10:1-1:1; setting the starch alkalizing temperature at 35-55 deg.c for 50-60 min; making the grafting modifying temperature at 30-60 deg.c for 60-120min.

The invention provides a construction method for a natural bipolar biomass gel artificial muscle device. Theconstruction method is characterized by comprising the following three steps of: firstly, carrying out biological crosslinking reaction on natural a high-molecular polymer sodium alginate and carboxylated chitosan to obtain a biomass gel electricactive film with excellent biocompatibility and bipolar electric actuation behavior; secondly, by utilizing a hydrogen bond synergistic effect between sodium alginate and MXene surface functional groups, preparing a non-metal electrode membrane solution through direct water-bath blending, wherein the non-metal electrode membrane solution is high in conductivity, resistant to bending, safe and non-toxic after being formed into a membrane; and finally, sequentially and alternately laminating and constructing the electricactive film and the electrode film solution to form an artificial muscle device with a multi-layer hamburger-like structure, wherein an internal interface synthesis layer of the artificial muscle device is good in adhesion; the response deformation degree, the reversible actuation property and the movement range are increased; and very excellent electric-chemical-mechanical properties are shown. The construction method has the advantages of being scientific, reasonable, easy and convenient to operate, environmentally friendly, high in applicability and good in effect.

Provided are hydrogel microspheres for adsorbing heavy metal arsenic and a preparation method thereof. The hydrogel microspheres comprise the composition by the mass percentage: 2-10% of sodium alginate, 1-12% of an attapulgite monomer, and the balance water. The preparation method comprises the steps: (a) adding sodium alginate to deionized water or a theophylline aqueous solution, and mechanically stirring at room temperature, to form a sodium alginate solution; (b) adding the attapulgite monomer to deionized water or a theophylline aqueous solution, carrying out ultrasonic dispersion, and then removing a solid precipitate in a dispersion body by centrifugation, to obtain an attapulgite monomer suspension solution; (c) mixing the sodium alginate solution and the attapulgite monomer suspension solution according to the ratio of 1:9-10:1 and stirring evenly, to prepare an attapulgite-sodium alginate mixed solution; and (d) dropwise adding the attapulgite-sodium alginate mixed solutioninto a divalent metal ion crosslinking agent, to obtain ionic crosslinked gel particles, rinsing the ionic crosslinking gel particles by distilled water, and carrying out vacuum drying to obtain an attapulgite-sodium alginate modified polymer, namely the hydrogel microspheres.

The invention discloses a method for promoting a biofilm culturing effect by modifying the surface of polyurethane. According to the method, polyurethane is used as a template material in a layer-by-layer self-assembly process; iron and manganese ions cover the surface of the material through pretreatment of an iron-manganese salt solution, so that the surface of the material has certain surface positive charges; and plasma grafting modification is carried out to generate a large number of active free radicals on the surface of the material, covalent reaction with sodium alginate is carried out, finally, a layer-by-layer self-assembly process is realized under the driving of electrostatic force between a polyanion compound sodium alginate and a polycation compound chitosan, and therefore,a stable layered composite structure is formed on the surface of the material. By chemically modifying the surface of polyurethane, the obtained plasma modified iron and manganese ion-sodium alginate-chitosan layer-by-layer self-assembly material is good in biocompatibility, high in chemical stability, safe, non-toxic, simple to operate, low in cost and easy to obtain. By using the method, the microorganism immobilization efficiency can be effectively improved.

The invention discloses a chitosan / bacterial cellulose composite aerogel adsorbent and a preparation method and application thereof. The method comprises the following steps: 1, desugaring bacterial cellulose hydrogel, crushing to obtain slurry, diluting with water, uniformly stirring to obtain a bacterial cellulose aqueous solution, sequentially adding organic acid containing multiple carboxylicacid structures and chitosan, carrying out a cross-linking reaction process, dropwise adding the mixed sol into a sodium hydroxide solution for curing, carrying out solvent exchange on gel balls by using a tert-butyl alcohol solution, and carrying out freeze drying to obtain the chitosan / bacterial cellulose composite aerogel adsorbent. The chitosan / bacterial cellulose composite aerogel adsorbent prepared by the invention comprises millimeter-scale spheres, has an interpenetrating network microstructure, a high specific surface area and rich active groups, and has a higher adsorption capacity for Cu<2+> in water and is easier to separate compared with single bacterial cellulose and chitosan, in addition, the raw materials for preparing the composite adsorbent are eco-friendly and non-toxic,the cost is low, the synthesis method is simple, and the actual application is facilitated.

The invention relates to the field of water treatment and discloses a preparation method of a nickel metal-organic framework material for adsorbing water-borne pollutants. The method comprises mixingnickel hydroxide and hexafluorosilicic acid aqueous solution for stirred reaction to obtain a green mixture; suction-filtering the green mixture to obtain green nickel hexafluorosilicate aqueous solution, and performing recrystallization to obtain green nickel hexafluorosilicate crystal; mixing the methanol solution of the nickel hexafluorosilicate crystal with the methanol solution of 2-mercaptopyrazine, heating the mixture for self-assembling reaction, and then cooling down to room temperature to obtain a yellow sample; suction-filtering the yellow sample to obtain the sulfhydrylated metal-organic framework material. According to the preparation method of the nickel metal-organic framework material for adsorbing the water-borne pollutants, by performing sulfydryl modification on a metal-organic framework, the advantages of various components can be given full play to, collaboration on properties can be achieved, and the prepared nickel metal-organic framework material for adsorbing the water-borne pollutants has the advantages of being numerous in active group sites, good in absorptive property, simple in preparation and the like and is a heavy metal adsorbing material with a good development prospect.

The invention belongs to the technical field of heavy metal and organic pollutant wastewater treatment, and provides a preparation method of multifunctional biochar with heavy metal adsorption and organic matter degradation functions and an application thereof. The preparation method comprises the following steps: pyrolyzing a raw material solution of biomass powder, a catalytic metal source, HPMCand acid in an oxygen-containing atmosphere at the temperature of 100-280 DEG C to obtain the multifunctional charcoal. According to the method according to the invention, the method comprises the following steps: carbonizing a raw material aqueous solution containing biomass powder, HPMC, a catalytic metal source and an acid in an oxygen-containing atmosphere (hydrothermal carbonization under non-closed and oxygen-free conditions) in advance; according to the preparation method, the carbonized product which has a three-dimensional structure and relatively large granularity and is modified with rich active groups beneficial to heavy metal adsorption on the surface can be prepared, and catalytic metal ions can be bonded in situ through the active groups and HPMC and are loaded in a formedactivated carbon network. According to the technical scheme, the biochar with multiple functions of heavy metal adsorption and organic pollutant catalysis can be prepared.

The invention discloses water-soluble oxidized chitosan and a finishing method of the water-soluble oxidized chitosan on a fabric. The water-soluble oxidized chitosan is prepared by the following steps: dissolving chitosan in a 1-carboxymethyl-3-methylimidazolium hydrogen sulfate aqueous solution, oxidizing C2 and C3 sites of the chitosan by sodium periodate under microwave radiation to generate aldehyde groups, and then oxidizing primary hydroxyl at C6 site of the dialdehyde chitosan in an ionic liquid by concentrated nitric acid-concentrated phosphoric acid to generate carboxyl. The water-soluble oxidized chitosan can be used for modifying fabrics. Compared with a traditional chemical cross-linking agent modified fabric, the method has the advantages that the grafting efficiency of the oxidized chitosan is high, the enzyme treatment condition is mild, the reaction process is simple, the fabric is crease-resistant, antibacterial, efficient and lasting, the fabric is comfortable to wear, and the requirements of people on lasting functional ecological textiles are met.

A preparation method of an aluminum-oxidized starch complex tanning agent comprises steps of: first mixing starch and water, adding concentrated nitric acid and a catalyst, and stirring for reaction, washing reaction products with ethanol or acetone to obtain the oxidized starch; and evenly mixing the oxidized starch and aluminum ions, oscillating, steaming out excessive water by a rotary evaporimeter, and drying the obtained product. The method of the invention can effectively improve the tanning property of the aluminium tanning agent, maintain original advantages of the aluminum tanning agent and greatly mitigate the phenomenon of detanning. The method of the present invention employs nitrate as an oxidant to oxidize hydroxyl groups to generate oxidized starch with high degree of carboxylic substitution, and utilizes a principle of acid degradation to reduce the relative molecular mass of the oxidized starch, so as to obtain aluminum-containing macromolecular tanning agent with good permeability, high absorption rate and excellent tanning property. The obtained leather tanning agent has good tanning and filling performances, and is suitable for main tanning and retanning; after the main tanning, a pickled skin has a shrinkage temperature raised to 90 DEG C, gains pure white leather body and obvious thickness increase; and after retanning, a product has good elasticity, bright color, gloss, and soft and full handle.

The invention relates to a pre-gelatinized starch-chitosan grafted copolymer flocculating agent and a preparation method thereof. The flocculating agent and the preparation method are characterized in that a modified starch / chitosan copolymer flocculating agent is synthesized under the conditions that pre-gelatinized starch and chitosan are utilized as raw materials, ceric ammonium nitrate is used as an initiator, and the pH (Potential of Hydrogen) is 9, wherein the mass ratio of modified starch to chitosan is (2-5): 1; the reaction temperature is 30 to 60 DEG C; the reaction lasts for 8 hours; and the initiator used accounts for 0.1 to 1% based on the total mass of the system. The pre-gelatinized starch-chitosan grafted copolymer flocculating agent prepared by the method has the characteristics of being high in effect, low in cost, able to remove heavy metal ions, and environment-friendly; and compared with the conventional flocculating agent, the pre-gelatinized starch-chitosan grafted copolymer flocculating agent enables the removal rate of heavy metals in different wastewater to reach 90% with less dose.

The invention discloses a preparation method of an inorganic-organic composite polymer water treatment defluorination flocculant, which is characterized by comprising the following steps of (1) stirring a sodium silicate solution at a constant temperature to obtain a colorless transparent solution, then adding diluted hydrochloric acid for acidification, and stirring to obtain a solution A, (2) dissolving aluminum chloride hexahydrate and ferric chloride hexahydrate in distilled water, adding the solution A while stirring, then adding sodium carbonate, and stirring to obtain a solution B, (3) dissolving modified chitosan, poly dimethyl diallyl ammonium chloride and sodium hydrogen sulfite in distilled water, adjusting the pH value with diluted hydrochloric acid, and stirring to obtain a solution C, and (4) adding the solution B into the solution C, and stirring for reaction to prepare the defluorination flocculant solution. When the flocculant disclosed by the invention is used for treating the fluorine-containing wastewater, the fluorine content in the effluent can reach the class III first-grade discharge standard of national Environmental Quality Standard for Surface Water (GB3838-2002), the fluorine removal rate is high, the fluorine removal effect is obvious, and deep treatment of the fluorine-containing wastewater can be realized.

The invention relates to a cyclamen soilless culture substrate and a preparation method thereof. The soilless culture substrate is composed of the following raw materials (by weight): 15-20 parts of landscaping waste, 10-15 parts of municipal domestic sludge, 10-15 parts of spent mushroom substrate, 8-12 parts of wormcast, 3-6 parts of vermiculite, 2-5 parts of fine river sand, 1-3 parts of fishbone dust, 0.05-0.1 part of carbendazim (800-fold) and 0.5-0.8 part of trace elements. The soilless culture substrate prepared by the method fully meets requirements on mineral nutrition, moisture, gas and other environmental conditions and contains biochemical humic acid. The rich active groups are capable of regulating physiological metabolism of crops and promoting growth and development of crops. Waste of nutrients is reduced, and plants grow more vigorously and ornamental value is higher.

The invention discloses an environment-friendly cementing agent for road use. The environment-friendly cementing agent comprises the following components in parts by weight: 20-60 parts of waste plastic, 10-30 parts of rubber oil, 5-8 parts of waste butadiene styrene rubber powder, 2-8 parts of modified starch, 2-10 parts of lignin, 5-15 parts of inorganic filler and 1-5 parts of coupling agent. The invention also discloses a preparation method of the environment-friendly cementing agent for road use. The environment-friendly cementing agent for road use is good in high-temperature stability, has excellent low-temperature crack resistance and high cementing capability, has no production of excessive waste gas, waste water and solid wastes in a preparation process and is high in construction capability; in addition, the environment-friendly cementing agent for road use has the effect of turning wastes into valuables by taking the waste plastic and waste rubber as raw materials, so that not only are resources saved, but also the processing cost is also reduced.

The invention discloses a method for applying waste water of viscous oil after treated to low-pressure steam boilers. The method mainly comprises the following steps: A, floating oil operation is carried out on the waste water of the viscous oil, and then the waste water of the viscous oil enters an electric floating device so as to further remove the oil; B, the outlet water after added with water purifier passes through a mixer, and then enters an electric catalytic oxidation floating device to carry out electric floating operation; C, the outlet water of the electric catalytic oxidation floating device passes through a filter device to be filtered; and D, the filtered waste water enters an ion-exchange tower to be softened, and then the softened waste water is applied to the low-pressure steam boilers. The treated waste water can replace the clear water to be applied to the low-pressure steam boilers, so that clean water which is in increasing shortage can be saved, and the problems that the waste water of the viscous oil cannot be discharged and the environment is polluted can be solved.

The invention relates to a method for hydrolyzing thick mash of agricultural and forest biomass raw material to produce glycose. The method is characterized in that fiber biomass is used as the raw material, and a normal-pressure instantaneous glycerin organic phase boiling pretreatment method is adopted, so that while more than 90% of cellulose in raw material is maintained, more than 70% of lignin and less than 20% of cellulose can be selectively removed; a large amount of glycerol glycoside is produced in the collected glycerin treatment liquid, but the furfural type fermenting inhibiting matter is basically not produced, and the glycerin can be directly recycled for 7 to 11 times; when the crude cellulose of glycerin has 10 to 40% of matrix concentration and 2 to 15FPU.g<-1> matrix enzyme carrying amount, the 72hr enzymatic hydrolysis ratio can reach 70% or more. The method for hydrolyzing the thick mash of the agricultural and forest biomass raw material to produce the glycose has the characteristics that the simplicity and economy are realized, the efficiency is high, the environment-friendly effect is realized, and the simultaneous commercialized application prospect of biodiesel and cellulosic ethanol is realized.

The invention relates to ternary polymerization polymeric flocculant and a preparation method thereof. The preparation method is characterized in that lignin, ethylene glycol and humic acid are used as raw materials and are initiated to polymerize by using an initiating agent under certain reaction conditions, so that the lignin-ethylene glycol-humic acid ternary polymerization polymeric flocculant is prepared. The prepared lignin-ethylene glycol-humic acid ternary polymerization polymeric flocculant is brownish black viscous liquid, non-toxic and environmental friendly, contains numerous active groups and has a good flocculation effect on various electroplating wastewater, dye wastewater, municipal sewage, coking wastewater, montmorillonoid suspension liquid and the like.

The invention provides a secondary battery, at least one of a positive pole piece, a negative pole piece and an electrolyte of the secondary battery comprises an additive with small molecular weight and short molecular chain segment, and the additive can be fully mixed with an active substance, a conductive agent and a binder in the positive pole piece and the negative pole piece. And the additive can be in full contact with each component in the positive electrode and the negative electrode and is immersed into internal pores of the pole piece. In addition, the additive has good compatibility with electrolyte components in the electrolyte, and can be easily dissolved in the electrolyte within the addition amount of the additive. The additive can form a film on the surfaces of positive and negative active substances, can effectively improve the composition of a solid electrolyte film on the surfaces of the positive and negative active substances, improves the content of polymer components in a solid interface film, improves the conduction of electrons and lithium ions in positive and negative pole pieces of the battery, and enhances the dynamics of lithium ions in the pole pieces. The internal resistance of the battery in the cycle process is prevented from increasing and the cycle life is prolonged.

The invention provides a functional material prepared from copper flotation tailings and a preparation technology of the functional material to solve the problems that the resource utilization degreeof copper flotation tailings is very low and stacking disposal can damage ecological environment and threaten production safety. The technology comprises key processes as follows: (1) performing particle size screening on the copper flotation tailings to remove coarse-grained tailings; (2) performing surface activation on fine-grained tailings obtained after particle size screening; (3) performinglanthanide series loading on the fine-grained tailings obtained after surface activation treatment. The prepared functional material has good adsorption removal capacity for phosphate in water, can be applied to phosphorus removal purification of natural water and different kinds of wastewater and has greater actual application prospects and commercial development value. The harmless treatment and resource utilization of the copper flotation tailings are realized through preparation of the functional material, waste is changed into wealth, and the basic strategy of waste resource regenerationand development of circle economy is conformed.

The invention relates to the technical field of saline-alkaline soil improvement, in particular to an efficient water quality improver applicable to saline-alkaline soil mariculture; the improver is composed of, according to parts by weight, 50-150 parts of desulfurization gypsum, 20-60 parts of biodegradation enzyme composition, and 80-120 parts of natural and synthetic copolymer mixed improver. The improver of the invention enables clean culture and harmless mission for the industry of mariculture and is practically significant to the protecting and supervising marine environments and human food safety.

The invention discloses a preparation method of digital printing ink based on boron nitride nanosheet modification. The method comprises the following steps: firstly, preparing boron nitride nanosheets by a solvent stripping method, then performing surface activation on the boron nitride nanosheets by using a hydrochloric acid solution and a hydrogen peroxide solution to obtain activated boron nitride nanosheets, and finally modifying by using a silane coupling agent to obtain modified boron nitride nanosheets; uniformly mixing an aqueous vegetable dye and deionized water by stirring, then adding a viscosity regulator, a bactericide and a pH regulator, uniformly mixing by stirring, continuing adding the modified boron nitride nanosheets, finally adding a wetting agent, mixing by stirring,then heating to 60-70 DEG C, mixing by stirring for 1-2h, then cooling to a room temperature, continuing stirring for 1-2h, and filtering by using a polypropylene membrane with the thickness of 0.25-1micron to obtain the digital printing ink. By the method, the operation is simple, the obtained digital printing ink is good in stability, excellent in high temperature resistance, non-toxic and environment-friendly.