245results about How to "Increase electrostatic repulsion" patented technology

The invention discloses an aqueous grinding fluid applied to super precision grinding of hard and brittle materials and an application method thereof. The grinding liquid contains chelant 0.1-5, a pH value regulator 5-15, a suspending agent 0.2-5, a dispersion stabilizer 0.5-10, a lubricant 5-20, an antirusting agent 0.5-5, fungicide 0-2, a defoamer 0-2 and deionized water compensating the balance of total amount of 100 parts. Under an alkali condition, the aqueous grinding fluid applied to super precision grinding of hard and brittle materials is beneficial for grinding materials with various sizes, has good suspension property and dispersion stability; when the aqueous grinding fluid is used for super precision grinding of various different hard and brittle materials, especially high-hardness materials, scratches, etching pits and other defects are not produced easily; and the grinding speed is high, the subsequent cleaning is convenient; and the aqueous grinding fluid has excellent lubricating property and antirusting property when in matched use with the grinding materials, and the mixing liquid is uniform in color and has no sediment in 48 h. When the aqueous grinding fluid is used for grinding a wafer on a grinding machine, the ground wafer is subjected to water-added ultrasonic washing, and the wafer has good surface smooth finish, no scales, etching pits and other defects, and the surface roughness can be within 2 microns.

The invention discloses a formaldehyde-free soybean powder adhesive. The formaldehyde-free soybean powder adhesive is prepared from the following components in parts by weight: 100 parts of water, 20 to 70 parts of soybean powder, 0.1 to 10 parts of a modifier, 20 to 120 parts of a crosslinking agent, 0.05 to 5 parts of a regulator and 0.1 to 3 parts of a reducing agent. The formaldehyde-free soybean powder adhesive is good in bonding performance and water resistance, low in production cost, long in storage period, and convenient to transport and use. A preparation method of the formaldehyde-free soybean powder adhesive is simple in preparation, good in controllability, easy to operate and realize industrial production and low in production cost, so that the formaldehyde-free soybean powder adhesive has good economic benefit, is favorable for popularization and application, and has wide application prospects.

The invention discloses a monolithic cellular catalyst for SCR smoke denitration, which adopts TiO2 powder as a substrate. The catalyst is added with active ingredients and additive at the same time. The active ingredients comprise TiO2, WO3, MoO3, V2O5, ZrO2 and MnO2. The additive comprises water reducer, binder, pore-forming agent, extrusion assistant and glass fiber. The invention further discloses a preparation technology for the monolithic cellular catalyst for SCR smoke denitration, comprising the following steps: dry mixing, kneading and pugging to obtain a mud section with good plasticity and a compact structure; extruding to obtain the blank of the monolithic cellular catalyst; drying and baking to obtain the monolithic cellular catalyst for SCR smoke denitration. The invention has simple preparation technology, greatly reduces the water quantity during the kneading process through adding the water reducer which is adopted as one active ingredient, reduces the maintaining conditions of the catalyst after being formed, and improves the strength, abrasion resistance and yield for forming the catalyst.

The invention discloses a carbon nano-tube / carbon multilevel pore spherical composite and a preparation method thereof. The preparation method comprises the following steps: firstly, pretreating a carbon nano-tube; adding the pretreated carbon nano-tube and a small amount of adhesive into deionized water to obtain a carbon nano-tube suspension; adding the carbon nano-tube suspension in a low-temperature liquid medium dropwise, rapidly solidifying to obtain a composite ice ball, rapidly transferring the composite ice ball into a freeze drier, and vacuum drying to obtain a carbon nano-tube initial composite globule; carrying out carbonization and strengthening on the carbon nano-tube initial composite globule to obtain a carbon nano-tube / carbon composite globule; and further carrying out activation on the carbon nano-tube / carbon composite globule to obtain the carbon nano-tube / carbon multilevel pore spherical composite. The carbon nano-tube / carbon multilevel pore spherical composite is provided with mesopores and micropores and is also provided with a macropore which penetrates through the surface and the spherical center and is high in specific surface area, large in pore volume and good in adsorption property.

The invention belongs to the technical field of lithium ion batteries, and particularly relates to an inorganic and organic composite multihole diaphragm. The diaphragm comprises a multihole diaphragm base material and an active coating layer attached to at least one surface of the multihole diaphragm base material, wherein the active coating layer comprises inorganic particles, vinylidene fluoride and hexafluoropropylene copolymer, cellulose based polymer with the molecular weight of 100,000 to 1,000,000 and at least one of polyacrylic acid and polyacrylate. Compared with the prior art, the diaphragm keeps relatively high air permeability and lithium ion transmission capacity; the active coating layer and the multihole diaphragm base material are well bonded; and the overheating contraction performance and the puncture strength of a diaphragm base can be improved remarkably. Furthermore, the invention also discloses a preparation method for the diaphragm and a lithium ion battery with the diaphragm.

The present invention is directed to peptide amphiphile compounds, compositions and methods of use, wherein nanofiber bundling or epitope aggregation is inhibited. In certain embodiments, the peptide amphiphiles of the present invention have increased solubility and reduced nanofiber bundling. The molecules may be used in pharmaceutical applications, for example for in vivo administration to human patients, by increasing biological activity of the compositions toward neurite outgrowth and nerve regeneration.

The invention discloses a synthetic method for maleic polycarboxylic water reducer. The method is characterized in that: maleic anhydride (MA) and polyethylene glycol (PEG) / methoxy polyethylene glycol (MPEG) are used as the raw materials to synthesize polyethylene glycol maleate monoester (PEG-MA) / methoxy polyethylene glycol maleate monoester (MPEG-MA); and PEG-MA / MPEG-MA, AA / AANa and methoxy polyethylene glycol metacrylic acid ester (MPEG-MAA) are used as the raw materials to synthesize a maleic polycarboxylic water reducer containing carboxyl and a polyoxyethylene (PEO) side chain structure. According to the invention, the molecular structure of the polycarboxylic water reducer introduces carboxyl and PEO with a long side chain, which enables electrostatic repulsion among cement particles to be increased, dispersibility, i.e. retentivity of dispersion of cement to be improved, and steric hindrance among cement particles is realized, thereby realizing low slump loss. Simultaneously, the preparation method provided in the invention has the advantages of a simple process, mild reaction and wide sources of cheap raw materials.

The invention discloses a preparation method of an ester type viscosity reduction type polycarboxylate superplasticizer. The method comprises the following steps: (1) preparing an esterified monomer; (2) conducting the copolymerization reaction; (3) conducting the neutralization reaction. According to the technical scheme of the preparation method, methyl methacrylate and dimethylaminoethanol, remaining after the preparation of the esterified monomer, are subjected to ester exchange in the same condition of preparing the esterified monomer so as to obtain dimethylaminoethyl methacrylate as a functional monomer. Therefore, the preparation method is cost-saving and simple in operation. In addition, the functional monomer is directly introduced into the copolymerization reaction to react with other cationic monomers. During the polymerization process, anions, cations and tertiary amine groups are attached to polycarboxylic acid molecular chains, so that the surface adsorbability of cement particles can be improved. The electrostatic repulsion effect between cement particles is improved. Not only the ester type viscosity reduction type polycarboxylate superplasticizer is good in anti-sludge effect for sand and gravel materials high in cement content, but also the ester type viscosity reduction type polycarboxylate superplasticizer is good in dispersibility and viscosity-reducing effect.

The invention relates to a cleaning agent and more particularly relates to a metal cleaning agent and a preparation method thereof. By adoption of the preparation method, the problem of longer preparation time needed by the existing cleaning agent. The metal cleaning agent is prepared from the following components in parts by weight: 10-18 parts of washing assistant, 4-15 parts of surface active agent, 0.2-0.8 part of solubilizing agent, 1-1.5 parts of corrosion inhibitor, 0.2-0.5 part of antirust agent, 1-2 parts of complexing agent, 0.2-0.8 part of preservative, 0.5-1.5 parts of antistatic agent and 0.5-1 part of organic silicon defoamer, and also comprises water for dissolving the components. The metal cleaning agent and the preparation method has the beneficial effects that the neededpreparation time is short, and the prepared cleaning agent has the advantages of strong cleaning effect and fast cleaning speed.

The invention provides a preparation method and application of a pH sensitive type magnetic demulsifier with surface charges and hydrophilic-hydrophobic properties controlled. Based on magnetic Fe3O4 nanoparticles, through surface modification with silicon dioxide and a grafting copolymerization reaction, surface active monomers and pH sensitive monomer copolymer chains are introduced on the surfaces of the nanoparticles, and the surface grafting structure and the pH value are further adjusted to control the surface charges and hydrophilic-hydrophobic properties of the magnetic nanoparticles. The reduction of the pH value can enhance the hydrophobic property of the magnetic nanoparticles and reduce negative charge repulsive interaction between the demulsifier and oil droplets so that the demulsifier can be absorbed onto the surfaces of the emulsified oil droplets and quickly isolate the emulsified oil droplets under the action of an external magnetic field. Recycling of the magnetic nanoparticles can be achieved, and the demulsifier is be unlikely to be affected by pollution of negative-ion surface active materials in emulsified oil wastewater. According to the magnetic demulsifier, the preparation method is simple, the recycling process is convenient and efficient, the recycling performance is excellent, and therefore the magnetic demulsifier has very board application prospects in the fields of emulsified oil wastewater treatment and oil-water separation.

The invention discloses an anthracycline liposome injection, including the injection and a frozen powder injection and a preparation process of the injection. The frozen liposome consists of the anthracycline or an anthracycline hydrochloride, compound neutral phospholipids, surfactant, negative-charge phospholipids, buffers, PH regulators and freezing protection agent. The preparation process includes the following steps: preparation of a hollow liposome, a homogenized liposome, an anthracycline lopsome and an anthracycline lopsome suspension; adding the freezing protection agent; constant volume; sterilization; sub-package; freezing and drying; storage, etc. The liposome injection can be preserved for 12 months under the room temperature with better stability. And the encapsulation rate can be above 95 percent and a granule diameter is between 30 and 300mm. The side effect is low and the technique is simple, thus being convenient for industrial production.

The invention discloses a preparation method of an ether viscosity reduction type polycarboxylate superplasticizer, which comprises the following steps: (1) copolymerization reaction; and (2) neutralization reaction. According to the preparation method disclosed by the invention, amide groups are connected to superplasticizer molecules, and then a polycarboxylate molecular chain has anion and cation groups, so that adsorbability on the surfaces of cement particles can be increased, the electrostatic repulsion effect between the cement particles can be increased, and a better viscosity reduction effect on concrete is achieved. Moreover, the amide groups are hydrolyzed under alkaline conditions so as to release potential carboxyl groups again, thereby being favorable for improving the dispersibility and slump retentivity of the superplasticizer and realizing high adaptability to cement of different varieties.

The invention provides a preparation method of a polycarboxylic acid water reducing agent containing a phosphate group. The preparation method comprises the following steps: firstly, preparing a terminal alkenyl unsaturated phosphonic acid monomer; secondly, mixing acrylic acid, the unsaturated phosphonic acid monomer, a chain transferring agent and de-ionized water to prepare a mixed monomer solution; by taking an alkenyl polyoxyethylene ether macro-monomer solution as a base material, dropwise adding an initiator water solution and the mixed monomer solution respectively under a room-temperature polymerization condition; uniformly stirring, dropwise adding and reacting; and finally neutralizing with a sodium hydroxide solution to obtain the polycarboxylic acid water reducing agent. According to the water reducing agent, the terminal alkenyl unsaturated phosphonic acid monomer is introduced into a structure and primary adsorption is facilitated; the initial dispersity is improved, and hydration and agglomeration of cement are delayed; the slump retaining property is effectively improved and the sensitivity to concrete is reduced; and the stress resistance and adaptability on different aggregate are enhanced.

The invention discloses a slow-release polycarboxylate superplasticizer and a preparation method thereof. The preparation method comprises specific steps as follows: firstly, small unsaturated carboxylic acid monomers and diphenylphosphinyl chloride are subjected to a partial reaction, and small unsaturated monomers containing phosphate ester groups are obtained; then 2-phenylethylamine and phosphate ester groups are added to a reaction system and subjected to a reaction, and small unsaturated monomers containing amide groups are obtained; the small unsaturated monomers containing the amide groups are subjected to an oxidation-reduction free radical polymerization reaction with unsaturated polyether macromonomers under the action of an initiating agent, a reducing agent and a chain transfer agent, and a copolymerization product is obtained; pH value is adjusted to 6-7 after the reaction, water is added, and the polycarboxylate superplasticizer is obtained. The amide groups containing benzene rings are introduced to side chains of the prepared polycarboxylate superplasticizer, so that the dispersibility of the polycarboxylate superplasticizer for cement is improved, the polycarboxylate superplasticizer has good slump retaining performance on the premise of water reduction, and besides, the yield of the polycarboxylate superplasticizer containing the amide groups can reach 94% or higher.

The invention provides an anionic-nonionic complex gasified coal water slurry additive. The additive is prepared by mixing the following components in part by mass uniformly: 21 to 41 parts of anionic dispersant lignosulfonate, 20.5 to 47.4 parts of anionic dispersant naphthalene sulfonate formaldehyde condensate, 5.3 to 10.3 parts of nonionic dispersant oxirane and poxypropane segmented copolymer, 21 to 25.6 parts of hole plugging agent, and 2.6 to 5.3 parts of acid-base regulator, wherein a composition of the anionic dispersant lignosulfonate, the naphthalene sulfonate formaldehyde condensate, and the nonionic dispersant oxirane and poxypropane segmented copolymer has unique synergistic property, so the synergistic effect of learn strong points to offset weakness can be played.

The invention discloses an artificial lawn adhesive composition with excellent performance. The adhesive composition comprises, by mass, 50-100 parts of aqueous latex, 20-30 parts of phenolic resin, 6-30 parts of a filler, 6-9 parts of aqueous PUR dispersion, 10-15 parts of a color paste, 1-3 parts of a cross-linking agent, 0.1-2 parts of a coupling agent, 0.1-0.5 parts of a mildew inhibitor, 0.1-0.3 parts of an antioxidant, 0.2-0.4 parts of an ultraviolet absorbent, 0.1-0.2 parts of an antifoaming agent, 0.5-1 part of a dispersant, 5-15 parts of a thickener and 2-5 parts of zinc oxide. The adhesive composition has the advantages of uniform particle size, stable properties, good weatherability, good waterproof property, strong ageing resistance, simple and easy preparation method, and low cost.

The invention discloses a method for manufacturing nanofiber transparent paper from straw, belonging to the field of papermaking. According to the invention, with adoption of oxidized fiber of a 1,3-dihydroxyacetone oxidization system, the electrostatic repulsive force among nano-cellulose is enhanced, so that the cellulose can be separated from cell walls completely, and the transparent paper has higher transparency and excellent mechanical strength. Sodium hypochlorite can be used as an oxidizing agent, has a bleaching function due to strong oxidizing property, and can react with little lignin left in original fiber to remove the lignin so as to improve light transmission. The raw materials are readily available, and the transparent paper is biologically degradable and cheap.

The invention discloses an ester-ether mixed structure mud-resistant polycarboxylate superplasticizer and a preparation method thereof. The superplasticizer is prepared from the following components in parts by weight: 180-220 parts of a polyether macromonomer, 140-180 parts of an esterification macromonomer, 30-40 parts of an unsaturated acid, 1-5 parts of an anionic monomer, 2-4 parts of an oxidant, 0.5-2.5 parts of tartaric acid, 0.5-1.5 parts of a chain transferring agent, 400-500 parts of deionized water and 140-160 parts of 32% sodium hydroxide. The ester-ether mixed structure mud-resistant polycarboxylate superplasticizer has the advantages of being low in admixture amount, high in water reduction rate and good in mud resistance, and even in case of a relatively high mud content ofaggregate, a relatively high water reduction rate can be maintained for the superplasticizer. Meanwhile, the superplasticizer is simple in process, can be prepared under a normal-temperature condition, and is easy in reaction condition control, low in energy consumption and free of pollution.

The invention relates to a magnetic iron-oxide nanoparticle covering method using silicon dioxide and belongs to the technical field of nano material preparation. The magnetic iron-oxide nanoparticle covering method using the silicon dioxide mainly comprises preparing water-soluble magnetic iron-oxide nanoparticles through a known method; adding appropriate surface modifier into water base dispersion liquid to form into stable water base dispersion liquid; adding simple substance metal silica powder into the water base dispersion liquid, heating and stirring, enabling the silica powder to hydrolyze under catalysis of alkaline substance to generate into silicon dioxide to be deposited on surfaces of the magnetic iron-oxide nanoparticles and obtaining the silicon dioxide covered magnetic iron-oxide nanoparticles. The magnetic iron-oxide nanoparticle covering method using the silicon dioxide has the advantages of being simple in preparation technology, green and environmental friendly, easily available in material and low win cost and achieving large-scale industrialized production due to the fact that organic solvent and surface active agent are not required in the preparation process and the covering reaction is performed in water solution; enabling obtained products to be strong in morphology controllability, high in purity degree and particularly suitable for biomedical application; being widely applied to silicon dioxide covering of other nanocrystallines such as quantum dots and precious metal nano particles.

The invention belongs to the technical field of concrete, and provides a high-slump-loss-resistant synergist, which is prepared from 40 to 60 parts of slump maintainers, 6 to 30 parts of thickening agents, 8.5 to 25 parts of polyhydroxyl retarders, 12 to 50 parts of excitants, 9 to 38 parts of sodium acetate or sodium silicate and 10 to 100 parts of hydramine or simethicone, wherein the slump maintainers are prepared from 300 to 450 parts of polyether, 20 to 45 parts of unsaturated acid, 30 to 80 parts of acrylic ester, 1.1 to 3.8 parts of chain transferring agents and 0.5 to 1.5 parts of reducing agents. A preparation method comprises the following steps of adding polyether into water; performing heating dissolution; then, dripping a material A and a material B; performing reaction for one hour to obtain the slump maintainers; adding water into thickening agents for dissolution; sequentially adding the polyhydroxyl retarders, the excitants, sodium acetate or sodium silicate; after thedissolution, adding hydramine or simethicone; adding the slump maintainers; performing uniform mixing to obtain the high-slump-loss-resistant synergist applied to concrete preparation. By using the technical scheme, the high-slump-loss-resistant synergist solves the problem of fast concrete slump loss in the prior art; meanwhile, the intensity is improved.

The invention relates to a preparation method of a carboxyl silicon modified acrylic resin emulsion, and the preparation method comprises the following steps of: mixing vinyl carboxyl silicone oil with a reactive alkenyl monomer and a functional monomer to prepare an oil-phase component, and then emulsifying by using an anionic / nonionic surface-active agent water solution to prepare a pre-emulsion; and then carrying out water-phase emulsion copolymerization on the pre-emulsion under the action of the anionic / nonionic surface-active agent water solution and an initiating agent, then depressurizing, eliminating low boiling, deodorizing, and regulating pH to 6.0-7.0 to prepare the carboxyl silicon modified acrylic resin emulsion. The carboxyl silicon modified acrylic resin emulsion prepared through the method disclosed by the invention has good centrifugalization stability and storage stability, is less in possibility of generating the phenomena of emulsion breaking and oil floating, is used for preparing a resin coating and can improve the phenomena of hot sticking and cold shortness of acrylic resin and endue certain hydrophobic and flexible functions to the resin coating.

The invention discloses pemetrexed disodium liposome injection which is mainly made of pemetrexed disodium and a preparation method thereof, distearoyl phosphatidyl glycerol, dipalmitoyl phosphatidyl choline, PEG600, cholesterol and mannitol. The liposome injection has the advantages that the particle size of liposome is small, the liposome is uniformly distributed, the encapsulation efficiency is high, the leakage rate is low, the stability is good, the solubility of the pemetrexed disodium and the quality of injection products are improved, the toxic and side effect is reduced, and the curative effect is improved.

The invention relates to a preparation method for a lipophilic nanometer powder SiO2. The procedure of the preparation method comprises: (1) the nanometer powder SiO2 is acted as an initial raw material, an activated surface treatment is applied with a hydrogen peroxide solution; (2) the surface of the nanometer powder SiO2 is modified and processed in an aqueous and oil phase mixed liquid with a Gamma -(methacryloyldoxy) propyltrimethoxysilane modifying agent, a dispersion liquid of the lipophilic nanometer powder SiO2 is produced; (3) the lipophilic nanometer powder SiO2 is made after the processing of liquid separating, distilling, and drying. The lipophilic nanometer powder SiO2 has the advantages of simple process, easy industrial production, and good compatibility of the lipophilic nanometer powder SiO2 with the organic solvent and even dispersion.

The invention relates to stable and high-performance proton exchange membrane fuel cell catalyst slurry and a preparation method thereof. The preparation method comprises the steps of: firstly, preparing a first mixed solution and a second mixed solution of water and isopropanol, mixing and dispersing the first mixed solution and a Nafion solution, obtaining a Nafion mixed solution, mixing and dispensing the second mixed solution and a catalyst, and obtaining catalyst slurry; and finally, mixing the Nafion mixed solution with the catalyst slurry, and carrying out ultrasonic dispersion to obtain the proton exchange membrane fuel cell catalyst slurry. Compared with the prior art, the stable and high-performance proton exchange membrane fuel cell catalyst slurry and the preparation method thereof have the advantages that the electrostatic repulsion in the slurry can be increased, so that the slurry is more stable, meanwhile, the ionomer can be more uniformly dispersed on the catalytic layer, the number of reachable protons is increased, and the performance of the fuel cell is improved. In addition, the method is simple to operate and suitable for large-scale preparation of the slurry.

The invention relates to a wet gradient honeycomb structure fiber membrane for medical and health protection and a preparation method thereof. The preparation method comprises the steps that firstly,electrostatic spinning is carried out on a first spinning solution composed of a hydrophilic polymer, a nanoscale metal organic framework, a first cross-linking agent and a first solvent, and an insulating material subjected to charge elimination treatment is taken as a receiving base material to obtain a first membrane; a second spinning solution composed of an intermediate polymer, a second cross-linking agent and a second solvent is then subjected to electrostatic spinning, and the first membrane is taken as a receiving base material to obtain a second membrane; and a third spinning solution composed of a hydrophobic polymer, a third cross-linking agent and a third solvent is subjected to electrostatic spinning, the second membrane is taken as a receiving base material to obtain a thirdmembrane, the composite fiber membrane is obtained, and finally, the composite fiber membrane is subjected to heat treatment to obtain the wet gradient honeycomb structure fiber membrane for medicaland health protection. The finally prepared membrane has a three-layer composite structure, the microstructure is in a three-dimensional honeycomb communication channel structure, and the single-direction moisture conductivity and the reverse barrier liquid penetration performance are excellent.

A process for preparing the wheat gluten protein with high emulsifying performance includes such steps as using acid solution to prepare the suspension of wheat gluten protein, heating to 60-90 deg.C, stirring, cooling to 30-55 deg.C, regulating pH value, phosphorylation reaction, regulating pH value, neutralizing by acid, washing, dewatering and drying.

The invention discloses a preparation method of an ether ester copolymerization type polycarboxylic acid water reducing agent for improving a rheological behavior. The water reducing agent is preparedthrough a copolymerization reaction of a first mixture, unsaturated polyether with the molecular weight of 4000-6000, unsaturated acid, a compound A, an initiator, a molecular weight regulator and deionized water, wherein the first mixture is prepared through an ester exchange reaction of methoxypolyethylene glycol with the molecular weight of 1000-4000, alkylphenol polyoxyethylene ether, unsaturated carboxylic ester and a polymerization inhibitor. According to the invention, a benzene ring and an imide structure are introduced, and the introduction of the benzene ring structure can effectively improve the adsorption efficiency and the thickness of an adsorption layer of polymer molecules on the surface of cement particles, so that the space stability effect of the water reducing agent ismore obvious; by means of introducing the imide structure, the adsorbability on the surface of the cement particles, the electrostatic repulsion effect among the cement particles, and the stability and the fluidity of the cement paste can be improved.

The invention discloses a polishing pad cleaning solution and a use method thereof, and belongs to the field of silicon wafer polishing pad cleaning technology. The cleaning solution comprises a polyoxyethylene ether non-ionic surface active agent, a cleaning addition agent, a blocking prevention agent, a solubilizing agent, a wetting agent and a PH (potential of hydrogen) conditioning agent, and the pH value of the cleaning solution ranges from 8.0 to 10.0. In a circularly polishing process, after the polishing, the polishing pad cleaning solution is diluted for 20-40 times, and then a polishing pad is scrubbed with a flow rate of 5L / min (maximum flow) for 1 min. With the adoption of the cleaning solution and the cleaning method, residual fouling and ion residues accumulated on the polishing pad in the circularly polishing process can be effectively removed, so that the moisture retention of the polishing pad can be increased, and the service life of the polishing pad is prolonged. The cleaning solution can be recycled, the price and the cost are low, and the cleaning solution has the advantages of simple processing, controllability and the like when used in cleaning.

The invention discloses a high-molecular-weight lignin pesticide dispersant with high carboxyl group content and a preparing method thereof. The preparing method includes the steps that after lignin and catechol are mixed evenly, concentrated sulfuric acid is added, and after reactions, the product is cooled to the room temperature, purified and dried to obtain phenolated lignin; the phenolated lignin and alkenyl succinic anhydride are placed in a reactor, and organic solvent and a sodium hydroxide solid are added and stirred; the temperature is raised to 80 DEG C-95 DEG C to conduct reactions, and carboxylation lignin is obtained after filtering, washing and drying; the carboxylation lignin is added into water to form a water solution under the stirring condition, the pH value is adjusted to 10-12, epoxy chloropropane is added to conduct a polycondensation reaction, and the pH value of a reaction solution is adjusted to 6-7 to obtain the lignin pesticide dispersant. The weight-average molecular weight of the obtained dispersant is larger than 15000, and the carboxyl group content is 3.2-4.0 mmol / g. The high-molecular-weight lignin pesticide dispersant is suitable for various kinds of pesticide wettable powder and water dispersible granules and has excellent dispersibility, stability, wettability and heat storing performance.