10results about How to "Increase electropositivity" patented technology

The invention discloses a preparation method of a high-performance magnesium-lithium separation membrane. The preparation method comprises the following steps: forming a polyamide film; mixing small molecular quaternary ammonium salt and amine monomer to serve as a solution for secondary interfacial polymerization; performing secondary interfacial polymerization to form a positive charge separation layer; and finally, promoting the reaction through high-temperature curing to obtain the nanofiltration membrane. According to the invention, the quaternary ammonium group with strong positive charges is introduced into the membrane in an in-situ grafting manner, the positive electricity of the membrane is increased, meanwhile, a transmission pore channel with positive charges is constructed, the operation is simple, the effect is obvious, the separation capacity of the membrane is greatly improved, and the method has a wide large-scale application prospect.

The invention relates to the technical field of stainless steel pipe fittings, in particular to a high-performance anti-corrosion stainless steel pipe fitting and a preparation method thereof.The preparation method of the high-performance anti-corrosion stainless steel pipe fitting comprises the following steps that S1, mechanical polishing is conducted; s2, removing oil; s3, acid treatment is conducted, specifically, the stainless steel pipe fitting blank obtained after oil removal is soaked in an acid surfactant solution for 5-10 min, and the stainless steel pipe fitting blank is taken out, washed with water and dried; the solute in the acidic surfactant solution comprises acid and a cationic surfactant; s4, adsorption treatment is conducted, specifically, the stainless steel pipe obtained after acid treatment is soaked in an adsorption solution containing graphene oxide for 4-10 min, and the stainless steel pipe is taken out and dried; and S5, anti-corrosion coating treatment is conducted, specifically, anti-corrosion coating is sprayed to the surface of the stainless steel pipe fitting blank, drying is conducted, and the high-performance anti-corrosion stainless steel pipe fitting is obtained. The method has the advantage that the anti-corrosion performance of the organic anti-corrosion coating can be improved.

This invention discloses a nanoRNA delivery system and its application in the control of Sclerotinia sclerotinia disease, relating to the field of biotechnology. The preparation method of the nanoRNA delivery system includes the following steps: mixing chitosan, sucrose, and aspartic acid uniformly and then subjecting them to a hydrothermal reaction to obtain a quantum dot-chitosan degradation product complex; mixing the quantum dot-chitosan degradation product complex with double-stranded RNA to obtain the nanoRNA delivery system; the double-stranded RNA is used to silence Sclerotinia sclerotinia virulence-related transcription factor genes. The nanoRNA delivery system provided by this invention can effectively protect RNA and exhibits a very high inhibitory effect on Sclerotinia sclerotinia in plants, providing a novel technical solution for the green and precise control of Sclerotinia sclerotinia disease.

The invention discloses a mouse nerve growth factor nano drug-loaded material and a preparation method thereof in the technical field of nano drug-loaded materials, and aims to solve the problem of low blood-brain barrier penetration rate. PBCA is subjected to in-situ modification, a hyperbranched amino structure is introduced into a poly (n-butyl cyanoacrylate) molecule, and through introduction of amino, the drug-loaded nano drug-loaded material is prepared. The electropositivity of the nano drug-loaded particles can be increased, so that the capacity of the drug for penetrating through the blood brain barrier during transport can be improved through an adsorption mediation way.

The present invention discloses a polyester fiber production process without antimony metal catalysis, and relates to the technical field of organosilicon materials. The present invention discloses a polyester fiber production process without antimony metal catalysis, comprising the following steps: using terephthalic acid and ethylene glycol as raw materials for esterification reaction, continuously adding a titanium catalyst during the esterification reaction to obtain an esterification product; inputting the esterification product into a pre-polycondensation kettle for pre-polycondensation reaction to obtain an oligomer; inputting the oligomer into a polycondensation kettle for polycondensation reaction to obtain a polycondensate; after the polycondensate is spun and post-finished, a polyester fiber is obtained; the present application uses a self-made titanium catalyst to replace the traditional antimony catalyst, which not only accelerates the reaction process, but also leaves no antimony metal residue in the product. The titanium catalyst prepared in the present application gets rid of the defects of the traditional titanium catalyst that is easily hydrolyzed to form TiO2, causing the polyester product to turn yellow, and has low thermal stability.

The invention discloses a thermochromic polyamide 6 master batch, a thermochromic polyamide 6 fiber and a preparation method of the thermochromic polyamide 6 fiber. The polyamide 6 master batch is prepared from the following raw materials in parts by weight: 2-5 parts of a porous nano material, 25-35 parts of dye and 60-70 parts of bright polyamide 6 slices. The porous nano material has adsorption performance, and the main component of the porous nano material is {Ag [Ag14 (iPrS) 10]} 5 < + > of a three-dimensional frame structure; the dye is Congo red, has negative charges and has a particle size of 50 nm, and the thermochromic polyamide 6 master batch has a melt index of 44.34 g / 10 min, a relative viscosity of 2.4, a water content of 780 ppm, an amino-terminated group content of 30.17 mmol / kg and a carboxyl-terminated group content of 64.81 mmol / kg. The thermochromic polyamide 6 master batch is prepared by compounding the porous nano-material with adsorption performance, the dye and the polyamide 6, and adsorption-desorption of the dye in the nano-material is controlled by changing the temperature by virtue of the property that the porosity of the porous nano-material is reduced along with temperature rise; furthermore, the thermochromism effect is achieved, and the thermochromism has reversibility.

The application discloses a preparation method of a positively charged nanofiltration membrane based on a strong electrolyte monomer, the nanofiltration membrane and application, and relates to the technical field of membrane separation. The positively charged nanofiltration membrane for magnesium / lithium ion separation is obtained by taking a cationic strong electrolyte monomer as an aqueous monomer and performing an interfacial cross-linking reaction of the strong electrolyte monomer with trimesoyl chloride on the surface of an ultrafiltration membrane. The strong electrolyte monomer adopted in the application contains a positive charge group and a reactive amino / hydroxyl functional group at the same time, and the prepared positively charged nanofiltration membrane has a high flux and can effectively separate magnesium ions and lithium ions. The preparation method provided by the application is simple in process and easy to operate, provides a reference direction for preparing a high-performance positively charged magnesium-lithium separation nanofiltration membrane, and has a good application prospect.

The invention provides a silver / gold and silver core-shell quantum dot and a preparation method thereof, and belongs to the technical field of quantum dot luminescent materials.The method comprises the steps that at the temperature of 20-25 DEG C, a silver nitrate solution and a sodium hydroxide solution are added into a methyl thiouracil solution, magnetic stirring, centrifugal filtering and washing are sequentially conducted, then the mixture is dispersed into the methyl thiouracil solution, and a silver / gold and silver core-shell quantum dot is obtained; a silver nanosphere inner layer core solution is obtained; at the temperature of 20-25 DEG C, a silver nitrate solution, a sodium hydroxide solution and a chloroauric acid solution are added into the silver nanosphere inner layer core solution and then magnetically stirred, and a silver / gold and silver core-shell quantum dot solution is obtained; and continuously introducing air into the silver / gold and silver core-shell quantum dot solution to obtain the silver / gold and silver core-shell quantum dots. The silver / gold and silver core-shell quantum dot disclosed by the invention has the excellent performances of stable structure, high temperature resistance, high surface plasmon fluorescence enhancement, sensitive and rapid heavy metal detection and the like, and has important reference significance on construction of a high-performance luminescent material.

The invention relates to a method for synthesizing methyl 1, 6-hexamethylene dicarbamate under the catalysis of bismuth metal salt. The method comprises the following steps: adding 1, 6-hexamethylenediamine, dimethyl carbonate and a catalyst into a reactor, and carrying out stirring reaction for 6-9 hours at 60-100 DEG C and normal pressure to obtain 1, 6-hexamethylene dicarbamate; the catalyst is metal salt bismuth acetate or supported bismuth acetate. The catalyst is simple in preparation process and can be recycled for multiple times, the cost loss is reduced, and the product yield is improved.

The invention discloses a supramolecular organic polymer and application thereof in adsorption of anionic pollutants, and belongs to the technical field of wastewater adsorption materials. The supramolecular organic polymer is prepared from brominated pillar [5] arene and polyethyleneimine in different molar ratios. The supramolecular organic polymer prepared by the method provided by the invention has very many amino groups, so that the supramolecular organic polymer shows very high electropositivity in water, simultaneously has a large number of adsorption sites, and has a better adsorption effect on anion pollutants, especially iodide ions, azo dyes and the like.