39 results about "Sodium gluconate" patented technology

This invention relates to the field of semiconductor cleaning technology and discloses a cleaning agent for semiconductor silicon wafers and its preparation method. This cleaning agent aims to solve the problem that traditional strong alkaline or phosphate-based wet electronic chemical cleaning agents easily corrode the silicon wafer surface, damage the crystal lattice, and thus affect electrical performance. This cleaning agent utilizes a multi-component synergistic effect: a surfactant system composed of alkyl glycosides and sophorolipids enhances particle wetting and stripping; lipase and silicon-pharmacoprotein precisely catalyze the removal of specific contaminants; sodium gluconate complexes metal ions; gelatin-polyacrylamide copolymer disperses contaminants to prevent secondary contamination; glycerol and trehalose maintain enzyme activity; and ultrapure water ensures the system meets the electronic-grade purity standards for wet electronic chemicals. Overall, it avoids strong alkaline corrosion, maintains the integrity of the silicon wafer lattice, and improves particle removal efficiency, meeting the high standards required for wet electronic chemical-based silicon wafer cleaning agents in advanced processes.

The application discloses a kind of corrosion and scale inhibitor sulfur removal agent and preparation method thereof, belong to sulfur removal agent technical field, by weight parts including following components: hydroxyl alkyl amine modified triazine compound 30~60 parts, polyaspartic acid scale inhibitor 10~25 parts, sodium gluconate 5~15 parts, ethylenediamine tetramethylene phosphonic acid sodium 3~10 parts, organic phosphonic acid corrosion inhibitor 2~8 parts and water 20~40 parts;The hydroxyl alkyl amine modified triazine compound is prepared by triazine sulfur removal agent and N-methyl diethanolamine or diethanolamine under 50~80 ℃ for 2~4 hours, wherein the molar ratio of triazine sulfur removal agent and hydroxyl alkyl amine is 1:0.3~0.8.The application is prepared by using hydroxyl alkyl amine modified triazine compound as core sulfur removal component, triazine sulfur removal agent and N-methyl diethanolamine or diethanolamine are reacted under specific temperature and time, which greatly improves the capture activity and reaction rate of hydrogen sulfide, and improves water solubility and dispersibility, realizes efficient sulfur removal.

The present disclosure relates to the technical field of concrete additive, and particularly relates to a concrete retarding water reducing agent and a preparation method and application thereof; the concrete retarding water reducing agent comprises a compound A, a component B, a component C and a solvent D; wherein the structural formula of the compound A comprises a polyphosphate chain segment and a polyether chain segment; the polyphosphate chain segment and the polyether chain segment are connected through a residue of a cyclic acid anhydride; the component B comprises the following: sodium lignosulfonate, sodium dodecyl sulfate, sodium gluconate and at least one organic acid; the component C comprises at least two of the following: borax, calcium silicate, fiber, magnesium sulfate and calcium chloride; and the solvent D is a mixture of water and an organic solvent. The present disclosure provides a novel concrete-based additive which can simultaneously play a good retarding and water reducing role.

This invention discloses a pretreatment solution for the etching process of aluminum foil for aluminum electrolytic capacitors based on synergistic complexation and its application method. The treatment solution contains sodium hydroxide, zinc oxide, a complexing agent, and a surfactant, and zinc chloride and potassium hydroxide can be added as needed. The complexing agent is at least one of sodium gluconate, sodium citrate, or disodium EDTA, and the surfactant is at least one of sodium dodecylbenzenesulfonate and sodium dodecyl sulfate. This invention inhibits the formation of Zn(OH)₂ precipitate through the synergistic chelation effect between the complexing agent and metal ions, enhances the surface activity of the aluminum foil, and improves the oxide film removal rate and the uniformity of corrosion porosity. In application, the aluminum foil is immersed in the treatment solution at 40-70℃ for 30-180 seconds with a stirring speed of 50-200 rpm. This invention is phosphorus-free and environmentally friendly, with high solution stability, and can increase the specific capacitance of the etched aluminum foil by more than 17.3%. It is suitable for the production of aluminum foil for high-voltage, high-specific-capacitance aluminum electrolytic capacitors and has high industrialization value.

Disclosed herein are aqueous oral care compositions and methods of making such compositions. One aspect of the aqueous oral care composition comprises sodium bicarbonate, glycerin, sodium gluconate, erythritol, magnesium chloride, zinc citrate, potassium citrate, water, and a plurality of extracts. Additional aspects include methods for making an aqueous oral care composition.

This invention relates to the field of water treatment chemicals, and discloses a hydroxyl-based coagulant aid, its preparation method, and its application. The coagulant aid is composed of solid polyaluminum chloride, polyvinyl alcohol, urea, an aqueous solution of alkyl glycosides, sodium gluconate, sodium tetraborate decahydrate, triethanolamine, deionized water, and glacial acetic acid for pH adjustment. This invention reduces the system viscosity through urea, and, combined with the spatial isolation of alkyl glycosides and the coordination chelation of sodium gluconate, inhibits the salting-out and phase separation of polyvinyl alcohol induced by high concentrations of polyaluminum chloride. The system utilizes sodium tetraborate decahydrate to construct a pH-regulated delayed cross-linking mechanism, maintaining liquid-phase homogeneity under slightly acidic conditions. When introduced into neutral or weakly alkaline water, the agent can undergo in-situ cross-linking with the water to form a network structure, which, in conjunction with inorganic aluminum salts, achieves the netting and sedimentation of suspended particles. This invention balances long-term storage stability in high-salt systems with highly efficient turbidity removal performance.

This invention discloses a color-difference-free, uniformly luminescent concrete and its preparation method. Addressing the problems of easy hydrolysis and sedimentation of luminescent powder in alkaline cement, and the significant reduction in luminescence efficiency due to physical coating, the invention uses white silicate cement, refined quartz sand, uncoated rare-earth-doped strontium aluminate luminescent powder, and rutile titanium dioxide as the base mixed raw materials. During preparation, a multi-component liquid phase containing sodium polyacrylate, sodium gluconate, sodium aluminate, strontium nitrate, polyvinyl alcohol, and sodium tetraborate is added to the slurry in a stepwise manner and stirred. This invention utilizes the interfacial adsorption and local common ion effect of sodium polyacrylate to construct a thermodynamically balanced microenvironment around the luminescent powder, preventing hydrolysis. Simultaneously, the cross-linking of polyvinyl alcohol and sodium tetraborate forms an in-situ transient rheological network to prevent luminescent powder sedimentation. As cement hydration proceeds, the gel automatically disintegrates, and titanium dioxide approaches the luminescent interface, generating light scattering to eliminate color difference. High-brightness, uniform luminescence in concrete can be achieved without physical coating.

The application discloses a kind of ultra-high temperature aerobic fermentation composite microbial inoculum for treating organic solid waste, belonging to solid waste biological treatment technical field.The composite microbial inoculum is compounded by functional microbial inoculum group and auxiliary group, the functional microbial inoculum group includes thermophilic side spore mold agent, thermophilic bacillus agent, high-temperature actinomycete agent, fecal alkali-producing bacteria agent, the auxiliary group is composed of modified diatomite, coated fungus bran carbon, oyster shell calcined powder, kitchen waste pretreatment powder, sodium lignosulfonate and sodium gluconate.The composite microbial inoculum is adapted to municipal sludge, livestock and poultry manure, open-air strip-pile type fermentation of kitchen waste mixed solid waste, can be quickly heated to 80 DEG C or more, ultra-high temperature duration is greater than or equal to 7.8 days, roundworm egg inactivation rate is greater than or equal to 99.9%, comprehensive antibiotic degradation rate is greater than or equal to 90.2%, heavy metal comprehensive passivation rate is greater than or equal to 85.5%, effectively control odor emission, can be applied to municipal sludge, livestock and poultry manure, open-air strip-pile type fermentation of kitchen waste mixed solid waste, and has good industrial application value.

This invention relates to the field of printed circuit board surface treatment technology, specifically to a highly stable chemical copper plating solution, comprising at least: 8-12 g / L copper salt, 9-13 g / L reducing agent, 25-32 g / L main complexing agent, 16-22 g / L auxiliary complexing agent, 0.2-0.35 g / L main stabilizer, 0.12-0.2 g / L auxiliary stabilizer, 0.1-0.18 g / L surfactant, and pH... The copper plating solution comprises: a regulator (18-25 g / L), a buffer (3-6 g / L), a corrosion inhibitor (0.08-0.15 g / L), and a flocculant (0.15-0.3 g / L). The main complexing agent is one or a mixture of ethylenediaminetetraacetic acid tetrasodium, ethylenediaminetetraacetic acid disodium, or sodium hypotriacetate. The auxiliary complexing agent is sodium gluconate. The main stabilizer is one or a mixture of 4,4'-bipyridine, 2-methylimidazole, or benzimidazole. The auxiliary stabilizer is one or a mixture of two of mercaptoethanol or 5-methylbenzotriazole. The copper plating solution provided by this invention ensures excellent copper plating performance while also having a long service life, effectively reducing maintenance frequency and copper plating costs.

The application discloses a rare earth compound flocculant and a preparation method and application thereof, and comprises a rare earth compound of gluconic acid, a rare earth compound of pyrithione and water, wherein the content of the rare earth compound of gluconic acid is 5-15 wt%, the rare earth compound of gluconic acid is prepared by reacting sodium gluconate and a first rare earth chloride salt in water; the content of the rare earth compound of pyrithione is 0.4-0.6 wt%, and the rare earth compound of pyrithione is prepared by reacting sodium pyrithione and a second rare earth chloride salt in water. The rare earth ions in the application have positive electricity, show extremely strong coordination ability and high coordination number. Meanwhile, the surface of Phaeodactylum tricornutum is negatively charged; therefore, when the rare earth ions contact with the Phaeodactylum tricornutum, the two can rapidly interact in electricity, cause the Phaeodactylum tricornutum to rapidly aggregate and form a mass, and then gradually precipitate.

This invention relates to the field of surfactants, and more particularly to an environmentally friendly, phosphorus-free, silicon-free metal surface degreasing agent and its preparation method. By weight, it comprises: 20-25 parts sodium carbonate, 15-22 parts sodium bicarbonate, 16-18 parts sodium citrate, 10-12 parts sodium gluconate, 6-8 parts tetrasodium diacetate of glutamate, 6-8 parts lipase, 3-6 parts fatty alcohol polyoxyethylene ether, 0.1-2 parts short-chain fluorocarbon polyether, and 9-12 parts isomeric tridecyl alcohol ethoxylate. This invention employs a compounding of multiple surfactants and adds lipase, reducing raw material costs, improving cleaning effect, and reducing cleaning time.

The application discloses a calcium sulfate scale remover for strong magnetic machine medium box and a preparation method and a use method thereof, and belongs to the technical field of water treatment. In order to realize efficient, rapid and low-corrosive removal of calcium sulfate scale in the strong magnetic machine medium box, the application provides a calcium sulfate scale remover for strong magnetic machine medium box, which is a liquid medicament, and 100ml of the medicament contains the following components: 18-22g of sodium hydroxide, 4-6g of disodium ethylenediaminetetraacetate, 0.8-1.2g of sodium gluconate, 0.2-0.4ml of lauryl alcohol ether phosphate, and the rest is water; and the use method comprises the following steps: submerging the strong magnetic machine medium box in the remover, cleaning the strong magnetic machine medium box by using a high-pressure water gun after soaking at normal temperature, and completing scale removal. The application adopts a composite formula, the components are complementary to each other, a cleaning chain of 'penetration-damage-dissolution-dispersion' is formed, the scale layer is disintegrated from inside to outside, excellent scale removal effect is achieved efficiently and rapidly at normal temperature, and low corrosion is ensured.

The application discloses a water treatment agent special for water machines, air conditioners and ground heating circulating water, and a preparation method and application thereof. The water treatment agent is composed of the following components in parts by weight: polyepoxysuccinic acid 25-35 parts, hydrolyzed polymaleic anhydride 15-25 parts, phosphonocarboxylic acid copolymer 10-20 parts, sodium gluconate 8-12 parts, acetic acid ester starch 3-6 parts, zinc salt 1-3 parts and deionized water 15-38 parts. The ternary compound system of "sodium gluconate+methyl benzotriazole+organic zinc salt" solves the problem of galvanic corrosion of copper and iron dissimilar metals in the system. Meanwhile, the synergistic dispersion effect of polyepoxysuccinic acid and phosphonocarboxylic acid copolymer exhibits super strong scale inhibition capacity under high-hardness water quality, and the total phosphorus content is lower than 2.5%. The application has the characteristics of environmental protection, low phosphorus, excellent corrosion and scale inhibition performance and balanced protection for double metals, and is especially suitable for heat pump units and ground heating closed circulating systems.

This invention discloses a Shun'an Zhongda stomach-protecting seasoning product, belonging to the field of food seasoning technology. This product uses one or more food-grade, chlorine-free organic sodium compounds selected from sodium lactate, sodium citrate, sodium malate, sodium gluconate, and sodium hexametaphosphate as its core salty component. It is compounded using conventional food processing techniques to produce edible forms such as liquid, powder, granules, paste, colloid, and tablets. This product eliminates the traditional sodium chloride component, is free of chloride ion irritation, and is mild and safe to consume. It is specifically designed to meet the daily seasoning needs of people with excessive stomach acid or sensitive stomachs. Furthermore, its preparation process is simple, its form is flexible, and its application scenarios are wide-ranging, giving it significant market potential.

This invention relates to the field of corrosion and scale inhibitors, specifically to a method for preparing a highly efficient and environmentally friendly corrosion and scale inhibitor. The invention utilizes polyepoxysuccinic acid, sodium D-gluconate, benzotriazole, polycaprolactam-urea copolymer, zinc sulfate heptahydrate, and thiourea to formulate a highly efficient and environmentally friendly corrosion and scale inhibitor. Polyepoxysuccinic acid is an environmentally friendly green corrosion and scale inhibitor because the oxygen atoms in its polar groups contain unpaired electrons, which can act as adsorption centers in solution, thus inhibiting corrosion. Furthermore, polyepoxysuccinic acid is also a chelating agent, capable of chelating calcium ions in water, thereby inhibiting scale formation. When thiourea is combined with other agents, it can exert a synergistic effect, making the adsorption layer on the metal surface more compact and increasing the corrosion inhibition performance of the formulation. The highly efficient and environmentally friendly corrosion and scale inhibitor prepared by this invention is phosphorus-free, non-toxic, highly efficient, and environmentally friendly, possessing significant economic and utilization value.

This invention discloses a high-efficiency cement retarder and its preparation method. The retarder is composed of the following raw materials in the indicated weight percentages: sodium gluconate 20-35%, AA / AMPS copolymer 10-20%, triethanolamine 1-3%, sodium carbonate 1-3%, sodium tetraborate 1-3%, sodium lignosulfonate 0-5%, sodium carboxymethyl cellulose 0.1-0.5%, and water 30.5-66.9%. By combining sodium gluconate with the AA / AMPS copolymer, the initial and final setting times of concrete are significantly delayed, allowing the concrete to maintain its plasticity for a longer period. Triethanolamine and sodium carbonate can improve the early and later strength of cement, compensating for the loss of early strength caused by retarding. The combined use of AA / AMPS copolymer, sodium lignosulfonate, and borax significantly expands the temperature application range, allowing the retarder to maintain its retarding effect under different ambient temperatures. Furthermore, sodium gluconate and sodium lignosulfonate, as low-cost raw materials, significantly reduce production costs while maintaining the retarding effect of the retarder, solving the problem of high production costs in existing retarder production.

The application discloses artistic plastic cement composite additives and application thereof, and relates to the technical field of composite cement. The artistic plastic cement composite additives are prepared from the following raw materials in percentage by weight: a retarding agent 0.5-2%, a water-retaining thickening agent 2-6%, a fiber reinforcing agent 1-4%, mineral pigments 70-85%, a thixotropic lubricant 3-7% and functional additives 5-10%. The retarding agent is at least one of tartaric acid, citric acid, sodium gluconate or a lignin sulfonate; the water-retaining thickening agent is selected from hydroxypropyl methylcellulose or methylcellulose; and the fiber reinforcing agent is at least one of polypropylene fiber, glass fiber and lignin fiber. The artistic plastic cement composite additives and application thereof have the advantages that, through the synergy of the retarding agent, the water-retaining thickening agent, the fiber reinforcing agent and the thixotropic lubricant, the artistic plastic cement composite additives have superior comprehensive performance in artistic plastic cement, and the strength and construction performance are taken into account.

The application discloses modified limestone powder and a preparation method and application thereof, and belongs to the technical field of building materials. The application provides a preparation method of modified limestone powder, and the preparation method comprises the following steps: mixing and grinding limestone raw materials and grinding aids. The grinding aids comprise sodium pyrophosphate, sodium gluconate, sodium citrate, an alcohol amine compound and water. According to the preparation method, the particle size of the obtained modified limestone powder can be effectively reduced, the sphericity of the modified limestone powder can be improved, and the content of free calcium ions in the modified limestone powder can be reduced. The application further provides the modified limestone powder prepared by the above preparation method and application of the obtained modified limestone powder.

The application provides a non-acid composite active plug removing agent and a preparation method thereof, and belongs to the technical field of plug removing agents.The non-acid composite active plug removing agent comprises the following raw materials: ethylene-vinyl acetate copolymer, a solvent, a mutual solvent, an organic sulfonate, diethylene triamine pentaacetic acid, sodium gluconate, a pH regulator, benzotriazole, hydroxyethyl ethylenediamine triacetic acid and methanol.The non-acid composite active plug removing agent is composed of an organic sulfonate, various active agents and a penetrating agent and the like.Through the penetration and dispersion of molecules, various types of plugging materials in the rock gap throat are dispersed, the pore throat is increased, and an effective seepage channel is formed.The non-acid composite active plug removing agent prepared by the application does not corrode and damage metal pipes and the dense rock body, is not acid-sensitive, does not cause flowback pollution, has a long plug removing and dredging distance, has a good and long-lasting effect, and is a new method for deep plug removing.

This invention discloses a composite component and preparation method of an anti-segregation pumping agent for manufactured sand concrete, specifically relating to the field of anti-segregation pumping agent technology. The composite component of the anti-segregation pumping agent for manufactured sand concrete is prepared by [method / process]. This invention is obtained by mixing and stirring a mixture of methyl allyl polyoxyethylene ether, comonomer mixture, ammonium persulfate initiator solution, mercaptoacetic acid chain transfer agent solution, sodium gluconate, aminotrimethylene phosphonic acid, sodium citrate, low-foaming and foam-stabilizing components, composite anti-segregation components, modified synergistic components, and slump-preserving microcapsules prepared with a modified water-reducing agent and a composite retarder. This invention improves the cohesive strength of cement paste and the interfacial bonding force of aggregates through the construction of an organic-inorganic composite gradient shear rheological network and an interface coupling reinforcement method, inhibiting aggregate sedimentation and bleeding stratification, and improving the segregation inhibition effect.

This invention discloses a method for preparing refined molybdic acid by alkaline leaching and acid precipitation of low-grade molybdenum oxide, belonging to the technical field of hydrometallurgy and comprehensive resource utilization. The method includes: mixing low-grade molybdenum oxide raw material with an alkaline leachate containing a specific composite alkaline leaching stabilizer (sodium gluconate, sodium hexametaphosphate, sodium polyaspartate, and sodium sulfide), and performing alkaline leaching at pH=11.0±0.2 and 80-85℃ to achieve efficient dissolution and preliminary purification of molybdenum; the resulting crude solution is then subjected to high-temperature, high-pH stripping to remove ammonia, thus removing NH4+. + The concentration was reduced to ≤50 mg / L; the purified solution was subjected to high-temperature acid precipitation at 85-95℃ using a mixture of concentrated nitric acid and concentrated hydrochloric acid, with the final pH controlled at 0.5±0.1, to obtain wet molybdic acid solid. After washing and drying, refined molybdic acid product was obtained. This invention effectively solves the problems of high impurities in low-grade raw materials, large molybdenum loss, and low product purity by synergistically combining stabilizer complexation-precipitation in the alkaline leaching stage with high-temperature enhancement and precise acid control in the acid precipitation stage. The total molybdenum recovery rate is high, the product purity and physical properties are good, and the process is stable and efficient.

This invention belongs to the field of agricultural fertilizer technology, specifically relating to an enzyme-stabilized glutathione water-soluble fertilizer and its preparation method. It comprises a functional microcapsule component and an NPK water-soluble salt system; the functional microcapsule component consists of a microcapsule core and a microcapsule wall material. This invention utilizes a glutathione reductase combined with a coenzyme regeneration system to directionally convert glutathione in the raw material into a reduced state; impurities are removed through enzyme inactivation, ultrafiltration, and fine filtration to suppress side reactions; under a weakly acidic environment, sodium gluconate and buffer salts are used to regulate the ionic environment, enabling zinc and manganese ions to form reversible coordination complexes with glutathione, possessing both storage protection and release utilization properties; sodium alginate-calcium gel combined with chitosan secondary encapsulation constructs a physical barrier, enhancing salt tolerance and shock resistance; low-temperature drying and low-shear granulation ensure the integrity of the microcapsules, resulting in a final product that combines storage stability and application dispersibility, achieving a synergistic effect of glutathione with zinc and manganese.

This application relates to formulations in powder form comprising sodium isethionate, aloe vera leaves, colloidal oatmeal, coconut milk or coconut oil, powdered jojoba vegetable oil, powdered copaiba resin oil, acacia senegal gum, soy lecithin, powdered lemongrass essential oil, powdered rosemary oleoresin, sodium gluconate, maize starch and arrowroot powder for use as soap and / or shampoo, gently cleansing the skin and scalp whilst protecting the skin barrier. The selected natural active ingredients are capable of reducing inflammation, soothing, treating and revitalising sensitive, reactive skin prone to conditions and inflammation, as well as maintaining the health of normal skin and hair. The focus is on protection and hydration in a formula packed with natural antioxidants, and the final formulation is suitable for all skin and hair / scalp types, from normal, dry or oily to reactive and sensitive skin affected by psoriasis, atopic dermatitis and / or erythema.

Cement with a high content of recycled aggregate powder is disclosed, belonging to the field of construction materials. The cement includes the following components in parts by mass: 30—40 parts of sulfoaluminate cement, 60—70 parts of recycled aggregate, 0.3—0.5 part of sodium gluconate, and 0.4—0.7 part of super—plasticizer. According to the present invention, by grinding recycled fine aggregate and recycled micro powder into recycled aggregate powder, a component CaC03 in the recycled aggregate powder is used to react with the sulfoaluminate cement to form different types of hydrated calcium carboaluminate, and a synergistic effect of other substances in the recycled aggregate powder is played, so that a high content of recycled aggregate powder and the sulfoaluminate cement form main bodies of the novel cement, and a novel hydration product system dominated by limestone, ettringite and hydrated calcium carboaluminate is formed, which is green cement.

The application relates to the technical field of snow-melting agents, and particularly discloses a biodegradable snow-melting agent and a preparation method thereof. The biodegradable snow-melting agent comprises the following raw materials in parts by weight: a freezing point depressant 30-50 parts, sodium gluconate 3-8 parts, a bio-based fatty alcohol polyoxyethylene ether 1-3 parts, a composite emulsifying thickener 0.6-2.5 parts, a low-temperature anti-freezing enhancer 2-5 parts, and water 50-60 parts. The composite emulsifying thickener comprises a locust bean gum and a sucrose ester in a weight ratio of 1:(4-10). The application helps to improve the low-temperature stability of the biodegradable snow-melting agent.

This application relates to the field of wastewater treatment reagents, and more particularly to an environmentally friendly wastewater treatment reagent and its preparation method. By weight, the raw materials of the environmentally friendly wastewater treatment reagent include: modified chitin: 25 to 40 parts, quaternary ammonium salt modified cellulose: 15 to 25 parts, coconut shell activated carbon: 10 to 25 parts, fatty alcohol polyoxyethylene ether: 3 to 5 parts, carboxymethyl cellulose: 5 to 10 parts, and sodium gluconate: 2 to 8 parts. This environmentally friendly wastewater treatment reagent, through a technical route of "natural polymer raw material substitution, synergistic integration of multifunctional components, process simplification and dosage optimization, and modularization," combines the structural advantages of natural polymers with the synergistic effects of multifunctional components. While ensuring treatment effectiveness, it achieves a composite treatment capability of wastewater treatment with no metal residue, partial biodegradability, and bactericidal function.

To provide a main material that can maintain excellent fluidity when made into a slurry, even in low-temperature environments such as winter. [Solution] A main material for use in a two-component hydraulic composition for 3D printers is provided, wherein the main material comprises a binder, a water-reducing agent, a retarder, and fine aggregate, the binder comprises cement and silica fume, the retarder comprises sodium gluconate and sodium L-tartrate, the content of the retarder is 0.5 parts by mass or more per 100 parts by mass of the binder, and the mass ratio α of the content of sodium L-tartrate to the content of sodium gluconate is 1.0 or more.

The application provides a zinc-nickel alloy whitening agent and a preparation method and application thereof. The whitening agent comprises a fatty amine polyoxyethylene ether, sodium xylene sulfonate, sodium gluconate, sodium sulfite, sodium citrate and water. The whitening agent can significantly improve the whiteness and brightness of an alkaline zinc-nickel alloy coating, and makes the coating present a uniform and delicate bright white color, thereby meeting the appearance requirements of high-end products. The components of the whitening agent have a synergistic effect, and the whitening agent has good chemical stability and is not prone to decomposition in the electroplating process, thereby being capable of maintaining a stable whitening effect for a long time and prolonging the service life of the electroplating solution. The whitening agent does not have a negative impact on key performances such as corrosion resistance and bonding force of the coating. The whitening agent does not contain harmful heavy metals and non-biodegradable organic pollutants, has few by-products in the use process, is pollution-free to the environment, and meets the development trend of green environmental protection. The preparation process of the whitening agent is simple and easy for industrial production.

This invention relates to the field of agricultural biotechnology, specifically to a method and strain for constructing an engineered strain of *Hookworm Copper-Gropping Bacteria* capable of producing methylmalic acid using both organic and inorganic carbon sources. This application involves knocking out the restriction endonuclease encoding gene of the type I restriction modification system in the genome of wild-type *Hookworm Copper-Gropping Bacteria* H16. 、 Promoters adapted for methylmalate synthase expression in *Hypoxonometra* were screened, and methylmalate synthases with high catalytic activity in *Hypoxonometra* were obtained, capable of effectively catalyzing methylmalate synthesis in *Hypoxonometra*. A methylmalate transporter protein that promotes methylmalate excretion was also screened, as well as a gene encoding the *Hypoxonometra* endogenous pyruvate dehydrogenase complex subunit that promotes methylmalate synthesis when sodium gluconate is used as a carbon source.

This invention provides a naphthalene sulfonate-modified coal-water slurry dispersion stabilizer, its preparation method, and its application. By weight, the raw materials include: 22-38 parts of rosin polyether-modified naphthalene sulfonate condensate, 1.5-3.5 parts of borate ester dynamically cross-linked cellulose microgel, 0.8-2.0 parts of auxiliary stabilizer, 5-10 parts of polycarboxylate-based water-reducing agent, 8-15 parts of sulfonated lignin, 0.8-2.5 parts of isomeric tridecyl alcohol polyoxyethylene ether, 5-10 parts of antifreeze and humectant, 2.5-5 parts of sodium gluconate, 0.4-1.0 parts of tris(hydroxymethyl)aminomethane-hydrochloric acid buffer pair, 0.15-0.6 parts of polyether-modified polysiloxane, and 30-50 parts of deionized water. The synergistic effect of the components in this invention allows the prepared coal-water slurry dispersion stabilizer to effectively regulate the rheological and stability properties of coal-water slurry, adapting to the performance requirements of coal-water slurry in biomass dense molding fuel processing.