142results about How to "Reduce electrostatic repulsion" patented technology

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 a collecting agent for phosphorite reverse flotation calcite, the collecting agent is composed of the components in following mass percent: 40-80% of fatty acid polyoxyethylene ester salt, 14-50% of alkyl polyoxyethylene ether phosphate monoester salt, 5-20% of fatty alcohol polyoxyethylene ether and 1-20% of span 20. The collecting agent is suitable for phosphorite reverse flotation calcite. Compared with the fatty acid collecting agent, the collecting agent has strong collecting capability and high selectivity; compared with the alpha-amido aryl phosphoric acid collecting agent, the price is low, the dosage is little, and the material is convenient. The collecting agent overcomes the defects of processing calcite in phosphorite by conventional flotation processing method that the collecting capability is poor, the recovery rate is low and the medicine cost is high. The collecting agent has obvious superiority on indicators in beneficiation and has new breakthrough.

The invention provides a non-aqueous solvent dyeing method of a washing-free reactive dye. The non-aqueous solvent dyeing method comprises the following steps: mixing pre-treated loose fibers, yarns, fabric or clothes with an reactive dye, a micro-molecular quaternary ammonium salt and a good solvent of the reactive dye, so as to form a mixing system; raising the temperature of the mixing system; adding a bad solvent of the reactive dye into the mixing system before raising the temperature or in a temperature rising process; keeping the heat after raising the temperature to a dyeing temperature, wherein the volume ratio of the good solvent of the reactive dye and the bad solvent of the reactive dye is 1 to (3-30), the ratio of the volume of the good solvent of the reactive dye to the mass of the loose fibers, the yarns, the fabric or the clothes is (0.8-10)mL to 1g, and the mass ratio of the micro-molecular quaternary ammonium salt to the reactive dye is (0.1-0.5) to 1; and then drying and putting into a color fixation solution and carrying out color fixation treatment, wherein the color fixation solution contains a 5-100g / L color fixation agent.

A microemulsion detergent for resource treatment of oil-containing solid waste, and a preparation method and an application thereof are provided. The microemulsion detergent comprises the components by the mass percentage: 1.2%-4.0% of fatty alcohol polyoxyethylene ether sulfate, 2.0%-4.0% of butyl lactate, 0.5%-1.0% of amyl propionate, 0.3%-0.9% of sodium chloride, and 91.1%-96% of water. The microemulsion detergent can be mixed with the oil-containing solid waste at room temperature, can complete repair treatment and can recycle oil resources with high efficiency; cheap and easily accessible NaCl is used as an electrolyte, other components have less amount, treatment operation is simple, three-phase separation is facilitated, and subsequent treatment of sludge is facilitated; and an intermediate liquid phase namely a microemulsion phase can also continue to be recycled, so that the cost is lower.

The present invention provides aqueous chemical mechanical planarization (CMP) polishing compositions have excellent heat aging and shelf stability in the form of concentrates comprising a mixture of a compound containing two quaternary ammonium groups, such as hexabutyl C1-C8 alkanediammonium dihydroxides or salts thereof, preferably N,N,N,N′,N′,N′-hexabutyl-1,4-butanediammonium dihydroxide (HBBAH), and aminosilane group containing silica particles in the amount of from 1 to 30 wt. % or, preferably, from 15 to 22 wt. %, as solids based on the total weight of the composition, the composition having a pH ranging from 3 to 5 or, preferably, from 3.5 to 4.5 wherein the composition is stable against visible precipitation or sedimentation at a 15 wt. % solids content after heat aging at a temperature of 45° C. for at least 6 days.

The invention relates to the technical field of an immunocolloid gold detection card, and discloses a detection card for detecting a benzodiazepine substance in health care products. The detection card includes a detection test strip, and the detection test strip is a colloidal-gold combination pad (2), a nitrocellulose membrane (3), and an absorbent pad (4) in order from a sample pad (1); the colloidal-gold combination pad (2) is a glass fiber gasket coated with a colloidal gold-labeled anti-benzodiazepine monoclonal antibody, the nitrocellulose membrane (3) is the nitrocellulose membrane provided with a detection line (5) and a quality control line (6), the detection line (5) is coated with a benzodiazepine-bovine serum albumin complex, and the quality control line (6) is coated with goat anti-mouse IgG. The invention also discloses a preparation method of the detection card for detecting the benzodiazepine substance in the health care products. The detection card can avoid the trouble of using complex identifiers or tracing buffer solutions, reduces sample differences, and improves sensitivity.

The invention provides a preparation method of nano zirconium oxide powder, comprising the following steps of: mixing inorganic zirconium salt, inorganic yttrium salt and water to obtain a mixed solution; dropwise adding the mixed solution into an ammonia water solution, and carrying out a precipitation reaction to obtain a precipitation solution; mixing the precipitation solution with an organicsolvent to obtain a precursor precipitation solution; filtering part of the precursor precipitation solution to obtain a precursor; mixing the precursor with the residual precursor precipitation solution, and filtering to obtain powder; and calcining the powder to obtain the nano zirconium oxide powder. By adding the organic solvent, the dielectric constant of the medium is effectively reduced, and the electrostatic repulsion between ions is reduced, so that the monodisperse spherical zirconium oxide powder is obtained; before calcination, the powder and the precursor precipitation solution are mixed, so that the particle surface defects and the surface activity are further reduced, the nano zirconium oxide powder with a low specific surface area is prepared, and the low specific surface area and high sintering activity of the zirconium oxide powder are realized.