51results about How to "Increase Zeta Potential" patented technology

The invention provides an electrochemical and anaerobic membrane combined biological sewage treatment plant and a treatment method thereof. The electrochemical and anaerobic membrane combined biological sewage treatment plant comprises a reaction tank in which a sacrificial anode electrode, a non-sacrificial anode electrode and a membrane module cathode are disposed. The electrochemical and anaerobic membrane combined biological sewage treatment plant further comprises a power supply device. A positive electrode of the power supply device is electrically and independently connected to the sacrificial anode electrode and the non-sacrificial anode electrode, respectively, and a negative electrode of the power supply device is electrically connected to the membrane module cathode. According to the present invention, electrochemistry and an anaerobic membrane bioreactor are combined, and pre-removal of pollutants, increase of sludge size and neutralization of sludge surface charges are achieved through electroflocculation; pollutants are electrostatically repelled by means of an electric field, and the morphology of a filter cake layer is improved by a hydrogen evolution reaction, achieving in-situ electrical cleaning of the membrane surface; the activity of microorganisms is stimulated by the electric filed so as to increase the metabolic rate of the microorganisms and promoting amethane yield. Moreover, pH decrease caused by metabolic acid production by microorganisms is mitigated by metal ions from electroflocculation.

This invention discloses a kind of aqueous dispersion of the nano pigment and its preparation method. The said method is fixing the hydrophobic colorant fully dissolved in polymer monomers into the nano microballoons of the cross linking polymers at the molecule-separate and colorant-aggregative-phase state by using the modified polyreaction in fine latex to obtain the seeds of prepolymerization, then constructing a modified and protective cross linking encloser of the polymer by the enveloping polyreaction, and finally making the nano pigment grains stably disperse in the water medium dissolved with the surface activating agent at a low concentration. The invented aqueous dispersion of the nano pigment is suitable for aqueous ink-jet color marking ink in high performance and color-screened distemper pieces used for making liquid crystal display devices. It can also be applied in pigmentation of the coatings, pigment materials of the high-end cosmetics and so on.

The invention relates to a method for prolonging the service life of an A-plane sapphire window polishing fluid. The method comprises the following processes: 1), during chemical and mechanical polishing of an A-plane sapphire, taking the A-plane sapphire window polishing fluid, and measuring the potential by using a Zeta potential analyzer to monitor the change condition of the Zeta potential ofthe A-plane sapphire window polishing fluid; 2), when the absolute value of the Zeta potential of the A-plane sapphire window polishing fluid is monitored to be not higher than 18 mv, directly addinga non-ionic surfactant into the A-plane sapphire window polishing fluid in use, when the absolute value of the Zeta potential of the A-plane sapphire window polishing fluid is not lower than 25.0 mv,stopping adding, then monitoring the Zeta potential once every 0.5-1.5 hours, and repeating the process, wherein the non-ionic surfactant is one or a mixture of several of fatty acid methyl ester ethoxylate, dodecyl polyethylene glycol carboxylate and fatty alcohol polyoxyethylene ether which can increase the Zeta potential of the polishing fluid and do not adversely react with the polishing fluidafter addition.

The invention discloses a method for preparing porous silicon nitride ceramics with high strength and high porosity. 3 N 4 Add sintering aid and dispersant aqueous solution to the raw material powder in sequence, adjust the pH and then add defoamer to prepare water-based slurry. By optimizing the order of adding each substance, each substance can maximize its role; On the other hand, ball milling the water-based slurry can improve the fluidity of the slurry. The pore-forming agent is selected from soluble starch, polymethyl methacrylate (PMMA) and stearic acid, which are all spherical in microscopic shape. At the same time, the spherical pore-forming agent can improve the fluidity of the slurry; in addition, slip casting can also break through the limitations of traditional compression molding on the mold, and meet the shape complexity and diversity of porous ceramic parts.

The invention provides PGE1 (prostaglandin E1) freeze-dried microemulsion composition. The composition is prepared from PGE1, a non-ionic emulsifier, chondroitin sulfate, anionic phospholipid and a freeze-drying protective agent, and raw materials and components comprise, in percentage by mass, 0.001%-0.04% of PGE1, 1%-55% of the non-ionic emulsifier, 0.1%-20% of anionic phospholipid, 0.6%-28% of an oil phase and 5%-98% of the freeze-drying protective agent. The encapsulation efficiency and the stability of the composition are significantly improved, reduction of free drug concentration is facilitated, vascular irritation of a preparation is reduced, and the composition is safer and more stable.

The invention relates to a method for prolonging the service life of a C-direction sapphire substrate polishing solution. The method specifically comprises the following steps: 1) in the process thatC-direction sapphire is subjected to chemical mechanical polishing, measuring potential by using a Zeta potential analyzer with a C-direction sapphire substrate polishing solution, and monitoring Zetapotential variation situations of the C-direction sapphire substrate polishing solution; 2) when monitoring that the Zeta potential of the C-direction sapphire substrate polishing solution is not greater than 20mv, directly adding a nonionic surfactant into the C-direction sapphire substrate polishing solution which is used at the moment, when a Zeta potential absolute value of the C-direction sapphire substrate polishing solution is not less than 30.0mv, stopping adding the nonionic surfactant, monitoring the Zeta potential every other 0.5-1.5 hours, and repeating the process, wherein the nonionic surfactant is one or a mixture of more of lauryl sodium sulfate, isomerism decanol polyoxyethylene ether and nonyl phenol polyoxyethylene ether. By adopting the method, the service life of thepolishing solution is remarkably prolonged for more than 12 hours, and the use cost of the polishing solution is reduced by 30% or greater.

The invention belongs to the technical field of polyurethane material, and discloses a heat-resistant high-solid-content waterborne polyurethane emulsion, and a preparation method and applications thereof. The preparation method comprises following steps: a polymer polyol is reacted with polyisocyanate so as to obtain a polyurethane performed polymer with -NCO terminal groups; a small molecular chain extender and a sulfonyl calixarene hydrophilic chain extender are added in the presence of an organic solvent, and reaction is carried out so as to obtain a polyurethane performed polymer solution; the polyurethane performed polymer solution is subjected to neutralization and emulsification, the organic solvent is removed so as to obtain the heat-resistant high-solid-content waterborne polyurethane emulsion. According to the preparation method, the sulfonyl calixarene compound is taken as a hydrophilic chain extender, so that the heat resistance and the solid content of the obtained heat-resistant high-solid-content waterborne polyurethane emulsion, and the heat-resistant high-solid-content waterborne polyurethane emulsion can be applied in fields such as coating, adhesive, or printing ink.