54results about How to "Clear molecular structure" patented technology

The invention relates to a three-arm efficient water reducing agent and a preparation method thereof, and belongs to the technical field of building concrete additives. The efficient water reducing agent is prepared through the step that an AB-type double-block copolymer of a three-arm structure is obtained through step-by-step polymerization by adopting three atom transferring radical polymerization reaction steps. The water reducing agent has the advantages of being controllable in chemical structure and molecular weight, narrow in molecular weight distribution and simple in process, is high in water reducing rate and good in slump retaining property, can obviously improve the concrete flowability and is low in sensitivity degree to mud. Compared with a traditional comb-shaped polycarboxylic water reducing agent, the problems that the polycarboxylic water reducing agent is sensitive to the mud in concrete, and the performance is reduced due to existence of the mud can be solved to a certain degree, and the three-arm efficient water reducing agent is especially suitable for the concrete with the high mud content.

The invention discloses a novel polysaccharide antibacterial mouthwash and a preparation method thereof. The novel polysaccharide antibacterial mouthwash comprises the active ingredients of carboxymethyl chitosan and propolis and further comprises a Chinese herbal medicine concentrate, sodium alginate, oleum menthae, a pH modifier, ethanol and purified water. The preparation method comprises the following steps: quantitatively adding carboxymethyl chitosan and a propolis and ethanol solution, and heating for dissolution; after the solution is cooled down, adding the Chinese herbal medicine concentrate, sodium alginate, oleum menthae and the pH modifier, supplementing purified water to obtain the total amount, and obtaining the novel polysaccharide antibacterial mouthwash after measuring the pH value. The novel polysaccharide antibacterial mouthwash has the effects of cleaning the oral cavity and resisting bacteria to protect teeth, meanwhile, reduces the allergy risk caused by propolis, has a very unique Chinese herbal medicine fragrance, is added with no synthetic essences, is safer and more healthy, is simple in preparation method, low in cost, lasting and effective in antibacterial effect, free from toxic and side effects on a human body and comfortable in taste.

The invention discloses an anti-senile beauty-nourishing traditional Chinese medicine composition, which is prepared from the following components in parts by weight: 1 to 30 parts of rhizoma dioscoreae, 1 to 30 parts of common bletilla tuber, 1 to 30 parts of radix angelicae, 1 to 30 parts of fructus rubi, 1 to 30 parts of black wolfberry fruit, 1 to 30 parts of white poria cocos and 1 to 30 parts of black mulberry fruit. The traditional Chinese medicine composition provided by the invention is reasonable in compatibility, by combining many years of clinical application, and taking the advantage of homology of medicine and food, the composition meets national standard and sanitary requirement, and is healthy, safe and harmless to human bodies.

The invention discloses a dipyridine iron complex, and a preparation method and applications thereof, and belongs to the field of isoprene catalytic polymerization. The preparation method is capable of solving technical problems in the prior art that in conventional polyisoprene synthesis process, the adopted catalyst is high in cost, and micro structure controllable adjusting capacity is poor. The dipyridine iron complex is prepared through reaction of an ethanol solution of dipyridine with an ethanol solution of a ferrous salt or a ferric salt. The dipyridine iron complex is taken as a main catalyst in polyisoprene polymerization, the activity is high, the molecular weight of obtained polymers is high, and molecular weight distribution range is narrow. The preparation method can be used in polyisoprene industrialized production.

The invention relates to the technical field of genetic engineering, in particular to a jujube glutathione peroxidase gene. The nucleotide sequence and amino acid sequence of the gene are shown by SEQ ID NO:1 and SEQ ID NO:2 in the sequence table. In the invention, a plant expression vector is constructed, a transgenic arabidopsis plant is obtained, and the salt tolerance and drought tolerance ofthe plant are evaluated to prove that the stress resistance of the plant is improved by transferring the gene into the plant as a target gene, thereby being of great practical significance to the plant variety improvement; and further study on the stress resistance mechanism of the plant with good resistance is conducive to making clear the molecular structure, expression, function and control ofthe adversity related gene, provides certain experiment data and lays theoretical foundation for further sufficiently using the good-resistance genes to improve the stress resistance of the plant, ishelpful to understanding the effect of GPXs in the signal transduction of plant active oxygen, and promotes understanding of people about the active oxygen serving as a signal molecular.

The invention discloses a metallic tin-containing double-decker polyhedral oligomeric silsesquioxane, and a preparation method and an application thereof. The metallic tin-containing double-decker polyhedral oligomeric silsesquioxane contains bimetallic tin, and has a structural formula represented by formula (I). The preparation method is carried out in a protective atmosphere, and comprises thefollowing steps: hydroxyl group-containing double-decker polyhedral oligomeric silsesquioxane and a metallic tin organic compound are dispersed in a solvent, then an additive is added, a reaction is performed, and post-treatment is finally performed to obtain the metallic tin-containing double-decker polyhedral oligomeric silsesquioxane. The metallic tin-containing double-decker polyhedral oligomeric silsesquioxane can be used as a catalyst for coordination ring-opening polymerization, and is especially used as a catalyst for the polymerization of polylactic acid. The metallic tin-containing double-decker polyhedral oligomeric silsesquioxane can obtain a narrow molecular weight distribution polymer when used as a coordination ring-opening polymerization catalyst, and they can be stored fora long time without affecting the catalytic performance.

The invention belongs to the technical field of preparation of alkaline earth metal modified silicon tungsten oxygen cluster catalyst materials, and in particular relates to a preparation method and application of a binuclear barium-silicon tungsten oxygen cluster catalyst. The catalyst can realize selective oxidation reaction of benzyl alcohol compounds, the conversion rate is as high as 93.6%, and the selectivity is as high as 96.5%.

The invention discloses a preparation method of a tetramer nickel substituted silicon tungsten oxygen cluster catalyst. The method comprises the following steps: placing K8[gamma-SiW10O36].12H2O, nickel chloride and water into a beaker and reacting, and then filtering and slowly volatilizing the filtrate, thereby acquiring a crystal of the tetramer nickel substituted silicon tungsten oxygen cluster catalyst. The method has the characteristics of high reaction speed, simple reaction process, high-purity product, simple post-processing, and the like. In the selective oxidization of sulfur ether, the conversion rate is as high as 93.4% and the selectivity is as high as 99.3%.

The invention aims to solve the problems of lower activity, large catalyst dosage and the like of a polyoxometalate cluster catalyst in a selective oxidation process of diphenyl sulfide with hydrogen peroxide as an oxidizing agent, and provides a preparation method for synthesizing novel N-N-allyl imidazole functionalized molybdenum oxygen cluster catalyst which is expected to have better catalysis in selective oxidation of diphenyl sulfide.

The invention relates to a pyridine imine ferrous acetylacetonate complex, a preparation method thereof and a method for catalyzing conjugated diene polymerization by using the pyridine imine ferrousacetylacetonate complex. The invention belongs to the field of conjugated diene catalytic polymerization. The invention aims to solve the technical problems of poor solubility of the existing iron-based catalyst in the reaction system and low molecular weight of the polymer catalyzed and polymerized by the iron-based catalyst. The pyridine imine ferrous acetylacetonate complex disclosed by the invention is prepared by reacting a dichloromethane solution of pyridine imine with ferrous acetylacetonate; the pyridine imine ferrous acetylacetonate complex serves as a main catalyst in conjugated diene polymerization, the catalyst is good in solubility in a reaction system and high in activity, the obtained polymer is high in molecular weight and narrow in molecular weight distribution, and the method can be used for industrial production of poly conjugated diene.

The invention discloses a preparation method of a three-arm block polycarboxylic acid water reducing agent. The preparation method comprises that triol, an alkali, CS2 and benzyl bromide in a molar ratio of 1: 3-4: 2-5: 2-7 undergo a reaction to produce a three-arm chain transfer agent, under the action of the three-arm chain transfer agent and an initiator, isoamyl alcohol polyoxyethylene ether and acrylic acid undergo an RAFT polymerization reaction to produce a three-arm block compolymer, and the compolymer is treated to form the three-arm block polycarboxylic acid water reducing agent. Thewater reducing agent has a controllable chemical structure, controllable molecular weight, narrow molecular weight distribution, simple processes, a high water-reducing rate and good moisture retention effects, can obviously improve concrete fluidity, has low sensitivity to mud, can meet higher construction requirements and has broad application prospects.

The invention discloses a novel use of acetate-containing small molecules as peroxidases acting as catalysts. It is disclosed herein for the first time that acetate-containing small molecules have peroxidase activity. The acetate-containing small molecules have clear molecular structure, are easy to obtain and insensitive to heat, have good stability and low price and are easy to commercially develop. The invention also successfully constructs a novel method of detecting hydrogen peroxide based on the novel use and successfully applies the novel method in test papers to detect hydrogen peroxide, glucose, uric acid, cholesterol and the like. The peroxidase activity based on the small molecules is applicable to the fields of food, environment and sanitation and the like, and the small molecules have a promising application prospect.

The invention discloses a preparation method of a heptanuclear manganese-substituted silicon tungsten oxide catalyst and application thereof. The preparation method comprises the following steps: placing sodium tungstate, water, manganese salt, sodium silicate and potassium chloride in a reaction kettle, adjusting the pH, carrying out a reaction, cooling to room temperature after the reaction, andfiltering to obtain black crystals. When the catalyst is applied to the process of synthesizing TBiTD by an oxygen method, the high yield is as high as 86%, a reaction process is simple, the obtainedproduct is high in purity, and post-treatment is simple.

The invention relates to the technical field of metal corrosion and protection, and discloses a copper corrosion inhibitor and a preparation method thereof. The copper corrosion inhibitor is Mannich base obtained through a heating reflux reaction of ethanolamine, formaldehyde and benzotriazole according to a certain proportion, is a mixed corrosion inhibitor with an anode as the main component, isremarkable in corrosion inhibition effect, and has safe and environment-friendly effects.