55results about How to "Response is smooth and safe" patented technology

The present invention relates to a double-phase stainless steel microstructure and sigma mesophase chromatic corrosive and a corrosion method, and is suitable for the detection of double-phase stainless steel. The corrosive comprises components of: 0.1-2g of potassium metabisulfite, 5-25ml of hydrochloric acid with mass percent concentration of 40%, 5-15ml of nitric acid with mass percent concentration of 68%, 5-15ml of hydrofluoric acid with mass percent concentration of 40% and 150-300 ml of deionized water. The invention has advantages of good corrosion effect, good display effect of structure of a corroded specimen, no pollution, stable corrosion reaction, and easy configuration.

The invention discloses a metallographical corrosive liquid and a preparation method thereof and a 2205 duplex stainless steel metallographical display method. The metallographical corrosive liquid is composed of potassium metabisulfite, hydrochloric acid and distilled water. The preparation method comprises the following steps: dissolving potassium metabisulfite with distilled water at the temperature of 50-60 DEG C, then adding hydrochloric acid and uniformly stirring, so that the metallographical corrosive liquid is prepared. The 2205 duplex stainless steel metallographical display method comprises the following steps: polishing, cleaning and drying a 2205 duplex stainless steel sample, so that a sample to be detected is obtained; corroding for 10-20 minutes by adopting the metallographical corrosive liquid until the metallographical surface of the sample turns black, so that a sample for observation is obtained, and observing by adopting a metallographical microscope. Compared with the prior art, the invention has the advantages and characteristics that the corrosive liquid is simple to prepare and pollution-free; the preparation method is simple and rapid, and black ferrite crystal particles and white austenite crystal particle tissue can be observed more obviously.

The invention belongs to the field of fluorine chemical synthesis and particularly relates to a fluorination method for end groups of perfluoropolyether acid. The perfluoropolyether acid and a fluorinating agent are taken as raw materials for synthesis in a gas-liquid contact reaction tube with fluorine gas passivated filler as a filling agent, and the filler adopts one or a mixture of carbon steel, stainless steel 304 and stainless steel 316. The perfluoropolyether acid or a solution thereof sprays downwards from the top of the gas-liquid contact reaction tube, a fluorinating agent gas makes sufficient contact with perfluoropolyether continuously from bottom to top through filler gaps in the gas-liquid contact reaction tube, maximized gas-liquid contact is realized, so that the utilization of the fluorinating agent is realized to the greatest extent, and fluorination of the perfluoropolyether is sufficient and complete. Besides, the perfluoropolyether is subjected to continuous fluorination, the problem of kettle-by-kettle fluorination in the prior art is solved, and the operation procedure is simplified. Few by-products are produced during fluorination of the perfluoropolyether, the operation is simple, continuous production can be realized, reactions are safe and stable, and the method is suitable for industrial mass production and application.

The invention discloses alkylol amine and a preparation method. Alkylol amine is one of preparation materials of a grinding aid for grinding cement. The chemical structure of alkylol amine is expressed as follows: N[C2H4O][C3H6O]2. Alkylol amine is prepared by performing a circular reaction of monoethanolamine and epoxypropane under the condition of vacuum, negative pressure and moderate temperature. Compared with the prior art, the technical scheme of alkylol amine and the preparation method provided by the invention has the remarkable advantages that alkylol amine obtained by the method is good in luster and high in purity, and the yield of cement can be improved by the cement grinding aid prepared by alkylol amine; and meanwhile, the preparation method is simple, the process is controllable, and the reaction is stable and safe.

The invention provides a corrosive agent and a corrosion method for a carbon steel and austenitic stainless steel composite material microscopic structure. According to the corrosive agent and the corrosion method, the safety is achieved, the operability is good, the erosion effect is good, the corroded sample tissue is good in display effect, the pollution is little, and the corrosion reaction isstable. The method comprises the steps that firstly, a first corrosive agent or a second corrosive agent is prepared, wherein the content of all components of the first corrosive agent comprises 0.1-0.2g of copper sulfate, 5-25 ml of nitric acid, 5-20 ml of absolute ethyl alcohol and 150-200 ml of deionized water, and the content of all components of the second corrosive agent comprises 0.2-0.5gof copper sulfate, 5-25ml of hydrochloric acid, 5-15 ml of hydrogen peroxide and 150-200 ml of deionized water; the sample is prepared into a sample to be tested; the sample to be tested is fully immersed in the first corrosive agent or the second corrosive agent to be corroded for 15-120 seconds to obtain a roughly corroded sample; the roughly corroded sample is washed, is cleaned with alcohol after being washed, and then is blown to be dried by cold air, and metallographic corrosion is completed.

The present invention relates to a double-phase stainless steel casting blank microstructure display chromatic corrosive and a corrosion method, and is suitable for the detection of double-phase stainless steel. The corrosive comprises components of: 1-8g of potassium metabisulfite, 10-25ml of hydrochloric acid with mass percent concentration of 40%, 5-5ml of nitric acid with mass percent concentration of 68% and 150-230ml of deionized water. The invention has advantages of reasonably designed formula, good corrosion effect, good display effect of structure of a corroded specimen, no pollution, stable corrosion reaction, and easy configuration.

The invention discloses a preparation method of chiral alpha-amino acid. Initial raw materials comprising aldehyde and N-acryl substituted glycine undergo Erlenmeyer-Plochl cyclization, hydrolysis or alcoholysis, asymmetric catalytic hydrogenation and acid hydrolysis to obtain the chiral alpha-amino acid compound. The method adopting the above synthesis route has the advantages of mild reaction conditions, simple technological operation, safe and stable production, realization of high yield, good chemical purity and good optical purity of the above obtained product, wide application range, and suitableness for industrial production.

The invention provides a high molecular weight unsaturated polyether macromonomer which is characterized in that the polyether macromonomer is at a liquid state at normal temperature, and the structural formula (I) thereof is expressed in the specification, wherein R<1> is same or different, and represents a hydrogen atom or alkyl with 1-20 carbon atoms; R<2> represents alkyl with 1-20 carbon atoms; R<3> represents alkyl or carbonyl with 1-10 carbon atoms; R<5> represents a hydrogen atom or alkyl with 1-20 carbon atoms; R<4>O is different, and represents oxyalkenyl with 2-18 carbon atoms; n represents the average addition mole number of the oxyalkenyl, and 5<=n<=300; and X, Y and Z are same or different, and represent -N, -O or H. By optimally designing the molecular structure, the high molecular weight unsaturated polyether macromonomer provided by the invention ensures the liquid state thereof at normal temperature while the molecular polymerization reaction activity is ensured. Besides, a preparation method of the high molecular weight unsaturated polyether macromonomer provided by the invention is simple, and the conditions are easy to control; and the product does not need slicing post-treatment, the production cost is low, and the economic benefits are increased.

The invention relates to a preparation method of halohydrocarbon-free alpha-cyanoacrylate, which comprises the following steps: mixing cyanoacetate and methyl carbonate in a reaction kettle, simultaneously mixing formaldehyde and a base catalyst in a charging hopper, then adding the mixture of the formaldehyde and the base catalyst to the reaction kettle at twice, performing a refluxing and condensation reaction at 78 DEG C under normal pressure, adding a dehydration solvent methyl carbonate to dehydrolyze after the condensation reaction is finished, adding an anionic polymerization inhibitor phosphorus pentoxide and a free radical polymerization inhibitor, and depolymerizing and distilling at 155-210 DEG C at a vacuum degree of 0.5-30 mmHg to obtain an alpha-cyanoacrylate coarse monomer; and rectifying the coarse monomer to obtain a high-purity alpha-cyanoacrylate refined monomer, wherein the yield of the alpha-cyanoacrylate refined monomer is more than 75%, and the purity of the alpha-cyanoacrylate refined monomer is 99%. The invention has the advantages of no pollution, energy conservation and high yield and high purity of the obtained product, and is stable in reaction, thereby being suitable for popularization and application.

The invention belongs to the field of fluorine chemical synthesis and particularly relates to application of a gas-liquid contact reaction device to fluorination of perfluoropolyether acid. The gas-liquid contact reaction device comprises a gas inlet cylinder for containing fluorinating agent gas, a reaction tube filled with filler, a liquid cylinder, a product collecting cylinder and a tail gas treatment device, wherein a liquid outlet connected with the product collecting cylinder and a gas inlet connected with the gas inlet cylinder are formed in the bottom of the reaction tube, a spray head is arranged at the top end of the reaction tube and is connected with the liquid cylinder through a liquid pump, a gas outlet connected with the tail gas treatment device is formed in the top of the reaction tube, and heating strips are arranged on the outer wall of the reaction tube. The gas-liquid contact reaction device is capable of fluorinating the perfluoropolyether acid by fluorine gas effectively.

A process for preparing high-hydroscopicity resin from polyurethane includes such steps as dissolving polyurethane in solvent mixture, using alkali solution to neutralize acrylic acid, mixing them together, adding disperser, trigger and cross-linking agent, and high-speed shearing while reaction in protective atmosphere.

The invention discloses a synthesis method and a use of monodispersed KMn8O16 nanospheres. The synthesis method of the monodispersed KMn8O16 nanospheres comprises the following steps of dissolving potassium permanganate, polyvinylpyrrolidone and carbonate in deionized water, adding soluble organic alcohol into the solution, carrying out mixing to obtain a uniform mixture, putting the mixture into a thermostatic bath, carrying out a thermostatic reaction process at a temperature of 50-120 DEG C for 1-24h to obtain brownish black precipitates, drying the brownish black precipitates, and calcining the dried brownish black precipitates in an argon atmosphere at a temperature of 300-600 DEG C for 2-20h to obtain the monodispersed KMn8O16 nanospheres. The monodispersed KMn8O16 nanospheres have structured morphology and uniform size adjustable in a range of 80-200nm. The monodispersed KMn8O16 nanospheres are prepared by a constant-temperature liquid phase reaction. The synthesis method is easy and simple and has a large yield. A performance test shows that the monodispersed KMn8O16 nanospheres have a large application prospect in the lithium ion battery energy storage field.

The invention relates to the technical field of materials for lithium batteries, in particular to a preparation method of lithium difluorophosphate and a byproduct treatment method. The method specifically comprises the following steps of: synthesizing LiPO2F2; crystallizing and purifying; filtering and drying a finished product; and carrying out by-product treatment to obtain high-added-value by-products. Through the reaction process, the inventor adopts a special catalyst and process, the reaction is safe and stable, the speed is high, intermediate materials and solvents are fully recycled and reused in the reaction process, the material consumption is low, and the method is environment-friendly; meanwhile, the product is easy to separate and purify, simple in process preparation and suitable for large-scale production.

The invention discloses a graded dendritic PtCu electro-catalyst and a preparation method thereof. The preparation method comprises the following steps: mixing oleylamine with oleic acid, heating, andcarrying out ultrasonic treatment, so as to obtain a colorless settled solution; maintaining the temperature, continuing to add ethanol, and carrying out ultrasonic treatment, so as to obtain a colorless settled solution; maintaining the temperature, continuing to add platinum acetylacetonate and copper acetylacetonate, and carrying out ultrasonic treatment, so as to obtain a light blue settled solution; and heating for reducing the light blue settled solution, so as to prepare graded dendritic PtCu. The method for preparing graded dendritic PtCu by virtue of an oil-phase solvent method is simple, stable and safe in reaction and high in repeatability. Meanwhile, by simply changing the parameters, the preparation of a PtCu nano-particle cube assembly and a PtCu nanometer concave-surface cube assembly can be realized. The method disclosed by the invention has a guiding significance to the preparation of other metal nanostructures.