7results about How to "Increase electrostatic repulsion" patented technology

This invention relates to an MPL composite adjuvant and its preparation method, belonging to the field of vaccine adjuvant technology. The composite adjuvant comprises neutral phospholipids, anionic phospholipids, cholesterol, monophospholipid A, QS-21, and surface-modified lipids. The preparation method includes: dissolving the lipid components in an organic solvent to form a mixed solution, evaporating the solvent to form a lipid film, adding buffer solution for hydration to form a liposome suspension, sonicating to obtain small monolayer liposomes, and then mixing with a QS-21 micelle solution. This invention significantly improves the stability of the adjuvant by introducing surface-modified lipids, exhibiting small particle size, uniform distribution, high negative zeta potential, good stability in serum environments, and the ability to induce high-level antibody immune responses, making it suitable for vaccine development.

The present application belongs to the technical field of preparation of multi-curved surface silicon carbide, and discloses a preparation method of reaction sintering multi-curved surface silicon carbide whole plate, comprising: mixing 100 parts of alpha-SiC powder, 15-20 parts of composite carbon source, 1-2 parts of silicon carbide fiber, 2.3-3.8 parts of dispersing agent, 8-12 parts of water-soluble phenolic resin, 2-4 parts of additive and 42-46 parts of water according to weight parts, pre-dispersing, ball-milling, spray granulating, pressing into multi-curved surface green body; the green body is stacked with graphite support parts and filled with graded silicon particles, and is subjected to step-by-step degreasing and step-by-step reaction sintering under vacuum argon, and then is cooled after temperature control to obtain the product. Through the synergistic effect of formula control of composite carbon source, specific ternary additive and fine sintering process, the technical problem of sintering cracking and cracking of multi-curved surface whole plate is eliminated, and the product density, bending strength and fracture toughness are effectively improved.

This invention belongs to the field of high-efficiency concrete water-reducing agents, specifically relating to a composite polycarboxylate anti-mud water-reducing agent, its preparation method, and its application. The composite polycarboxylate anti-mud water-reducing agent comprises the following raw materials: 30-40 parts by weight of anti-mud polycarboxylate water-reducing agent and 1-3 parts by weight of anti-mud sacrificial agent. The anti-mud polycarboxylate water-reducing agent is polymerized from methyl allyl polyoxyethylene ether and unsaturated carboxylic acid under the initiator and chain transfer agent. The anti-mud sacrificial agent is obtained by adding 4-5 parts by weight of hydrogen peroxide to 20-30 parts by weight of papermaking black liquor. The anti-mud sacrificial agent effectively resists the interference of soil on the polycarboxylate water-reducing agent and is simple to prepare, environmentally friendly, and pollution-free. The composite polycarboxylate anti-mud water-reducing agent prepared by this invention has good anti-mud properties, exhibits good dispersibility in mud-containing concrete, and also has good slump retention properties.

The present application relates to the technical field of metal powder material preparation, and particularly relates to a porous silver powder, a preparation method and application, by introducing a carbonate foaming agent into raw materials, the carbonate foaming agent can react with nitric acid generated in a liquid phase reduction process of silver nitrate and a reducing agent to generate carbon dioxide bubbles, and the carbon dioxide bubbles play an inducing role in a silver microcrystal formation process, so that the generated silver powder has a rich pore structure and a high specific surface area. Compared with the porous silver powder in the prior art, the porous silver powder has a higher specific surface area and sintering activity, by controlling the addition amount of the foaming agent, the pore structure, the specific surface area and the sintering activity of the silver powder can be accurately controlled, and the control method is simple, and the problems of low pore structure and high cost in the preparation of the porous silver powder in the prior art are solved.

The invention relates to the technical field of concrete admixture preparation, and particularly discloses a cement concrete admixture and a preparation method and application thereof.According to the cement concrete admixture, through multi-synergistic copolymerization of a polyether macromonomer, acrylic acid, modified cellulose and sodium allysulfonate in a specific proportion, the cement concrete admixture is prepared; the comprehensive performance of the concrete is improved. Methylallyl alcohol polyoxyethylene ether and acrylic acid construct a main framework of the admixture, so that the steric hindrance and the initial dispersion force of a foundation are guaranteed; by sulfonating cellulose and introducing a negatively charged sulfonic acid group, the flocculation structure among cement particles can be broken, and the initial water-reducing rate and the flowing speed are remarkably improved; and by introducing a carbon-carbon double bond, the modified cellulose can be introduced into a polycarboxylic acid macromolecular chain through a copolymerization reaction, and a rigid cellulose skeleton and a flexible polyether side chain jointly construct a three-dimensional space network structure, so that the steric hindrance effect of the admixture is jointly improved.

The invention belongs to the technical field of lithium iron phosphate batteries, and particularly relates to a lithium iron phosphate precursor slurry additive and carbon-coated lithium iron phosphate. The main component polycondensate A is rich in amino groups, hydroxyl groups, benzene rings and other functional groups capable of forming strong intermolecular force with lithium iron phosphate, and can be adsorbed on the surfaces of lithium iron phosphate particles during slurry grinding, at the moment, polyether side chains rich in the polycondensate A form a hydrated protective layer, flocculent precipitation between two lithium iron phosphate particles is prevented, and the lithium iron phosphate particles are prevented from being separated from each other. Therefore, uniform particle size distribution of the lithium iron phosphate is ensured, and the viscosity of the slurry is greatly reduced; the compound component ether amine polymer B can also be strongly adsorbed on the surface of the lithium iron phosphate to assist the main component polycondensate A in reducing the viscosity of the slurry; meanwhile, the compound C is an organic salt, so that the electrostatic repulsion on the surface of the lithium iron phosphate can be enhanced, and outstanding effects on reducing the viscosity of the slurry and shortening the grinding time are achieved.

This invention belongs to the field of paint removers and discloses a high-penetration modified water-based paint remover and its preparation method. The paint remover includes the following raw materials: deionized water, benzyl alcohol, formic acid, composite penetrant, sodium dodecylbenzenesulfonate, modified nano-Fe3O4, modified microporous starch, thickener, corrosion inhibitor, and defoamer. The modified nano-Fe3O4 is prepared by first preparing nano-Fe3O4, then forming a dense SiO2 shell on the Fe3O4 surface through tetraethyl orthosilicate hydrolysis, followed by surface treatment with a silane coupling agent, and finally grafting polyaspartic acid. The modified microporous starch is prepared by first preparing microporous starch using an enzymatic hydrolysis method, then loading molten microcrystalline wax and synergistic agents through a vacuum impregnation method, and finally cooling and solidifying. This invention, through the synergistic effect of the benzyl alcohol and formic acid main solvent system with modified nano-Fe3O4 and modified microporous starch, ensures efficient paint removal while providing good protection for the metal substrate.