42results about How to "Reduce the synthesis reaction temperature" patented technology

The invention relates to a method for preparing a SnIn4S photocatalyst through a low-temperature coprecipitation method. The method is characterized by comprising the following steps: using soluble tin salt as a tin source, soluble indium salt as an indium source, thiourea or thioacetamide as a sulfur source, and methanol, ethanol, propanol and glycol as solvents, performing condensing refluxing at 60-90 DEG C, stirring at a constant speed, and reacting for 3-7 hours; cooling to room temperature, performing suction filtration on a sample, rinsing with deionized water and ethanol for three times, drying the obtained sample for 6-24 hours at 80-120 DEG C to obtain the SnIn4S photocatalyst with relatively higher activity. The SnIn4S photocatalyst can effectively degrade methyl orange, rhodamine B and other organic pollutants in visible light and reduce some heavy metal ions; the method has the significant advantages of simpleness, easiness, low reaction temperature, low energy consumption, short response time and high yield; the product of SnIn4S has very high photocatalytic performance.

The method includes steps: according to proportion, mixing material of manganese source, material of doped elements and material of lithium source; carrying out preliminary treatments for the said materials; after wet mixing, synthesizing material of positive pole under 350 deg.C - 500 deg.C low temperature; carrying out crystallizing qualified treatment in 700 deg.C -900 deg.C high temperature for short time so as to obtain material of positive pole of lithium ion battery in pure phase and high crystal quality. Reserving strongpoint of solid phase method, accepting merit of liquid phase and overcoming shortcoming of pure solid phase method, the invention possesses features of cheap materials, fine electrochemical performances, simple equipment, non toxic matter produced.

The invention relates to a method for producing nano-sized vanadium carbide powder, belonging to the technical field of preparing ceramic powder. The method comprises the following processes: (1) mixing a vanadium source, a carbon source and an auxiliary into a solution according to a certain proportion; (2) heating the solution, so that the solution is volatilized, concentrated and decomposed to obtain precursor powder containing the vanadium source and the carbon source; and (3) reacting the precursor powder for 1-5 hours at the temperature of 700-1300 DEG C under certain atmosphere. The method is simple in technology, low in cost, and easy to industrialize, and the obtained vanadium carbide powder has a particle size of less than 50nm, and good dispersity.

The invention provides pyridazine-group-containing diamine monomer and a preparation method and application thereof and belongs to the technical field of organic synthesis. The preparation method includes: adopting a nucleophilic substitution method to enable a dihydroxyl compound containing flexible group or asymmetric structure or bulky side group to react with chlorine-containing nitro pyridazine to obtain a dinitro intermediate containing a pyridazine structure, and reducing the dinitro intermediate to obtain diamine monomer containing a pyridazine structure; enabling the diamine monomer to react with dianhydride, and performing thermal imidization to obtain a high-performance heterocyclic polyimide film. The high-performance heterocyclic polyimide film maintains excellent thermal performance and mechanical performance that polyimide has originally, has solubility and photopermeability improved remarkably and has wide application prospect.

The invention relates to a method for preparing a high heat-resistant polybutene-1 composite pipe material for transporting high-temperature fluids, which belongs to the technical field of polymer materials, and specifically includes adding cellulose powder into a sulfuric acid solution, stirring vigorously for 5-10 minutes, After stirring, filter with suction and wash with water until neutral; then dissolve the solid powder of bis[4-(1,1-dimethylethylbenzoyl-oxygen)]aluminum hydroxide in the organic Add the above solution to the obtained solid, raise the temperature of the mixture to 100°C-130°C, stir and react for 4-8 hours, after the reaction, filter the white powder in the solution, wash it with water, and dry it. That is, the special additive for polybutene-1 is obtained; finally, the polybutene-1 resin and the special additive for polybutene-1 are uniformly mixed in a high-speed mixer, and are formed through extrusion, granulation, injection molding and other steps to obtain High heat-resistant polybutene-1 composite pipe material; the polybutene-1 composite pipe material prepared by the invention can form a stable crystal form and has a heat distortion temperature as high as 136°C.

The invention discloses a synthetic method of perylene red 620 as perylene red dye. The method is characterized by comprising the following steps: 1,6,7,12-tetrachloro-3,4,9,10-perylenetetracarboxylicdianhydride is taken as a raw material and subjected to a reaction with 2,6-diisopropylanilineby catalysis of a catalyst under protection of inert gas, and the intermediate N,N'-bis(2,6-diisopropyl)phenyl-1,6,7,12-tetrachloro-3,4,9,10-perylenetetracarboxylic diimide is obtained; the intermediate is subjected to a reaction with phenol, and a crude perylene red 620 product is obtained; the crude product is washed and subjected to other processing, and perylene red 620 with higher purity is obtained. After introduction of the catalyst, synthetic reaction temperature of the intermediate is reduced, and reaction time is shortened by 2 / 3; the original column chromatographic process is replaced with a cooling, standing and suction filtration method, and accordingly, purity of the intermediate isimproved; the method has the characteristics of safe and reasonable process, simple processing steps, high yield, low cost, high product purity and the like.

The invention relates to a method for preparing a special auxiliary agent for improving the mechanical properties of polybutene-1 at the initial stage of molding and the application of the special auxiliary agent, which belongs to the technical field of polymer materials, and specifically comprises the preparation of aryl phosphate hydroxyaluminum salt solid powder Put it in an organic solvent according to a certain proportion, stir and dissolve at 100°C-130°C until it is completely dissolved, and obtain mixture A; add bacterial cellulose powder to mixture A to obtain mixture B; Acid anhydride, stirred for 4-10 hours; after the reaction, the reacted substance was suction-filtered, then washed repeatedly with methanol at 50-60°C, and the obtained white powder was dried to obtain polybutene-1 Special auxiliary agent, the special auxiliary agent prepared by the present invention is mixed with polybutene-1, which can make the mechanical properties of polybutene-1 reach the mechanical properties of crystal form I at the initial stage of molding, meet the use requirements, and then reduce production costs.

The invention discloses a preparation method of a resorcinol formaldehyde resin for an alkylphenol modified rubber adhesive, which comprises the following steps: a) adding alkylphenol and polyformaldehyde into an organic solvent, and stirring uniformly at 40-70 DEG C; b) dropwisely adding an alkali solution, and keeping the temperature for 1-4 hours; c) heating the product obtained in the step b) to 80-100 DEG C, keeping the temperature for 2-4 hours, and cooling to 90 DEG C below; d) adding oxalic acid into the product obtained in the step c), stirring, adding resorcinol, heating to 100-150 DEG C, and reacting under reflux for 2-5 hours; and e) removing the organic solvent from the product obtained in the step b), and starting granulation when the softening point of the product is 99-109 DEG C to obtain the granular resorcinol formaldehyde resin. The method uses polyformaldehyde instead of the formalin, and has the advantages of simple material feeding and lower risk.

The invention relates to a method for preparing pure phase oxide at low temperature, belonging to the material preparation technical field. The inventive method referrs the chemical formual of AB<x>M<1-x>O3, (x=0.50-1.0), to dissolve the nitrates of cerium, zirconium, titanium or gallium into water, and slowly add the carbonate, oxalate, nitrate, acetate, basic hydroxide, hydroxide or oxide of calcium, barium, strontium, lead or lanthanide metal element into the solution to be dissolved completely, heats and mixes precursor solution in water bath or oil bath at 50-100DEG C, until the solution changes to gel, and reacts the gel at 1000DEG C for 2-10h, to obtain oxide materials of pure phase and high crystallinity. The method for preparing pure phase oxide at low temperature has simple process, easy operation, low cost, high product purity and easily accessible industrial production.

The invention discloses a preparation method of a resorcinol formaldehyde resin for a modified rubber adhesive, which comprises the following steps: a) adding p-alkylphenol and polyformaldehyde into an organic solvent, and stirring uniformly at 40-70 DEG C; b) dropwisely adding an alkali solution, and keeping the temperature for 1-4 hours; c) heating the product obtained in the step b) to 80-100 DEG C, keeping the temperature for 2-4 hours, and cooling to 90 DEG C below; d) adding an acidity regulator into the product obtained in the step c), stirring, adding resorcinol, heating to 100-150 DEG C, and reacting under reflux for 2-5 hours; and e) removing the organic solvent from the product obtained in the step b), and starting granulation when the softening point of the product is 99-109 DEG C to obtain the granular resorcinol formaldehyde resin. The method uses polyformaldehyde instead of the formalin, and has the advantages of simple material feeding and lower risk.

The invention relates to a production method of a graphite / iron carbide / iron nanocomposite and belongs to the technical field of magnetic nanopowder production. The production method includes the processes: (1) dissolving ferric nitrate, adjuvants and a water-soluble carbon source in distilled water according to a proper proportion; (2) heating and stirring, and reacting solution after volatilization and concentration so as to obtain precursor powder containing iron and carbon; (3) reacting the precursor powder at the temperature of 700-1100 DEG C under a certain atmosphere for 0.5-2 hours. Graphite / iron carbide, graphite / iron or graphite / iron carbide / iron can be obtained respectively by regulating process parameters. The production method is simple in process, low in cost and easy for industrial production, and the obtained graphite / iron carbide / iron nanocomposite with the size less than 50nm is good in dispersibility and high in saturation magnetization.