55results about How to "Slow hydrolysis" patented technology

A process for preparing iron oxide red pigment from ferrous sulfate as the by-product of titanium oxide includes such steps as reducing iron scale at 50-70 deg.c, hydrolyzing for 6-10 hr, flocculating, deposition, refining heptahydrated ferrous sulfate, neutralizing with ammonia to generate crystal seeds, and neutralizing with ammonia while oxidizing with air to obtain target product. Its by-product, solution of ammonium sulfate, can be used for preparing composite fertilizer.

The invention relates to a method for synthesizing glycol ether ester. The method comprises the following steps that: glycol ether and fatty acid as raw materials are directly esterified and synthesized into glycol ether acetic ester at a temperature of between 80 and 180 DEG C in the presence of an acidic catalyst and an azeotropic dehydrating agent; and the acidic catalyst is paratoluenesulfonic acid or methanesulfonic acid, and dosage of the catalyst is 0.05 to 1 percent of total weight of reaction materials. The method is characterized in that the mol ratio of the fatty acid to the glycol ether is 1.0:0.8-1.5; and the azeotropic dehydrating agent is isobutyl acetate or 2-butanol acetate, and dosage of the azeotropic dehydrating agent is 5 to 30 percent of the total weight of the reaction materials. The method has the advantages that compared with butyl acetate, the azeotropic dehydrating agent used in the reaction has a lower boiling point and a lower azeotropic point, smaller solubility and lower hydrolysis speed, so that energy consumption during reacting and reclaiming the azeotropic dehydrating agent can be reduced, the reaction speed is improved, and water entrainment of a side product is reduced.

The invention discloses a titanium dioxide/graphene nanocomposite, and a normal-temperature preparation method and application thereof. According to the invention, a titanium source and graphite oxide are used as starting raw materials, an organic solvent is used as a reaction solvent, and the nanocomposite formed by compounding of titanium dioxide nanometer rods and graphene is obtained through normal temperature reduction and hydrolysis; and in the nanocomposite, graphene accounts for 1 to 30 wt%, with the rest being titanium dioxide. The preparation method provided by the invention has the advantages of simple process, easy preparation, mild reaction conditions, etc. In the prepared nanocomposite, titanium oxide is uniformly distributed on the surface of graphene, so the nanocomposite can be perfectly applied to the field of photocatalysis of photoelectric materials.

The invention belongs to the technical field of agriculture microbes, and provides a high-density fermentation culture medium for haemophilus parasuis and a preparation method for the same. The culture medium comprises the following components in weight/volume: 10-30 g/L of yeast powder, 1-10 g/L of soybean peptone, 1-10 g/L of maltose, 2-10 g/L of NaCl and 1-10 g/L of K2HPO4, the following components in volume ratio: 0.001-0.010% of NAD (nicotinamide adenine dinucleotide) and 2-10% of bovine serum, and the balance of water, wherein the pH is 7.0-7.4. The culture medium disclosed by the invention is beneficial to high-density fermentation for haemophilus parasuis, capable of obtaining a high bacterial quantity in a short time, low in cost, and capable of being used for large-scale production for vaccines.

The invention provides a method for preparing RuO2-SnO2 oxide completely composed of nanoscale rutile phase by using RuCl3, SnCl2 and SnCl4 as precursors. The ratio of RuO2:SnO2 in the titanium anode coating prepared by the invention is 1:4-4 : 1, the surface coating of the titanium substrate is entirely composed of nanoscale rutile phase RuO2-SnO2 oxide or solid solution, and its specific surface area exceeds 460m2·g-1; and the raw materials are easy to obtain and the method is simple.

The invention belongs to the field of biotechnology detection and relates to an antibody and magnetic bead directed coupling method. The method includes the following steps of: (1) magnetic bead pretreatment; (2) S-NHS treatment; (3) EDC treatment; and (4) antibody addition. With the method provided by the invention adopted, the directed coupling of antibodies and magnetic beads can be realized; the yield of effective antibodies is greatly improved; and the actual sensitivity and accuracy of detection are improved.

The invention provides glucamylase of which an amino acid sequence is SEQ ID NO:1. The invention discloses a glucamylase gene of gliocladium roseum for the first time. A shake flask fermentation experiment is carried out on recombinant bacteria, and the enzyme activity of a fermentation liquor can be up to 292U/ml. By adopting the glucamylase disclosed by the invention, an alpha-1,4-glucosidic bond can be efficiently decomposed from the non-reductive end of a carbohydrate chain, glucose can be hydrolyzed, and an alpha-1.6 glucoside bond also can be slowly hydrolyzed, and converted into the glucose, so as to be widely applied to the glucose industry.

The invention belongs to the technical field of electrode material preparation, and particularly relates to a preparation method of a nitrogen-doped antimony-carbon composite material and applicationof the nitrogen-doped antimony-carbon composite material in a sodium-ion battery electrode. Potassium antimony tartrate is used as an antimony source, dopamine hydrochloride is used as a nitrogen source and a carbon source, a precursor is obtained through a liquid-phase reaction at room temperature, and then the nitrogen-doped antimony-carbon composite material is obtained through centrifugation,washing, drying and carbonization treatment. In the reaction process, the hydrolysis speed of antimony in a solution can be effectively controlled by controlling the pH value of the reaction solution,and meanwhile dopamine is subjected to a slow polymerization reaction to form polydopamine which coats the surface of a hydrolysate. After the precursor obtained by adopting the method is subjected to carbonization treatment, the antimony-doped carbon composite material uniformly distributed inside can be formed, and the volume increase of the electrode material can be effectively relieved in thecharging and discharging process of the battery, so that the sodium ion battery keeps relatively high specific capacity. The method is simple and rapid, does not need complex equipment, is low in cost and is suitable for mass production.

The invention relates to fibrinolytic enzyme of trimeresurus albolabris venom, and the preparation method and the application thereof in pharmaceutical industry, and belongs to the biomedical field. Trimeresurus albolabris venom fibrinolytic enzyme is metal protease obtained in the venom of the domestic trimeresurus albolabris through separation and purification, has the activity of simultaneously degrading fibrinogen Aalpha chain and fibrinogen Bbeta chain, and is 66300 dalton under the reducing and non-reducing conditions of the apparent molecular weight on polyacrylamide gel electrophoresis. The preparation method comprises the following steps: firstly, pretreatment of trimeresurus albolabris venom; secondly, DEAE-Sephadex A-25 ion-exchange chromatography; thirdly, DEAE-Sephadex G-100 gel chromatography; fourthly, CM-Sephadex C-25 cation-exchange chromatography. The fibrinolytic enzyme of the trimeresurus albolabris venom has higher activity of simultaneously degrading fibrinogen Aalpha chain and fibrinogen Bbeta chain, and can be applied for curing thromboembolic disease.

The invention discloses a preparation method of a titanium dioxide/hollow microsphere composite filler. According to the method, a reversed-phase microemulsion system is adopted, an organic titanium source is slowly hydrolyzed on an oil/water interface through ultrasonic oscillation formed by small-frequency-band ultrasound, the surfaces of the hollow microspheres can be better coated with titanium dioxide crystal nucleuses due to the fact that the titanium dioxide crystal nucleuses are generated on a water phase layer; meanwhile, the reaction speed is controlled through two-step temperature rising, and the higher titanium dioxide film forming effect is achieved. According to the composite filler prepared by the method, the coating uniformity of titanium dioxide on the surfaces of the hollow microspheres is improved, so that the filler has obvious reflection performance and heat insulation and heat preservation effects.

The invention discloses a method for preparing an organic-inorganic hybrid film. The method comprises the following steps: 1, diluting alkoxysilane in anhydrous ethanol, gradually dropwise adding appropriate amounts of deionized water and a weak acid or a weak base to adjust the pH value for hydrolysis, heating the obtained solution to 40-70 DEG C while sufficiently stirring, performing intense stirring at a constant temperature for 8-16 h to fully hydrolyze the solution, and cooling the hydrolyzed solution to room temperature; 2, adding a small amount of an organic polymer to the obtained solsolution to change the viscosity of the sol, and adding an appropriate amount of a plasticizer to adjust the plasticity of the sol; 3, coating a multilayer support with the sol in a dip-coating manner for 10 s; and 4, carrying out constant-temperature and constant-humidity drying on the coated multilayer support at a temperature of 20-50 DEG C and a humidity of 30-90% for 6-72 h, slowly raising the temperature to 200-500 DEG C, and calcining the multilayer support under the protection of an inert gas for 2-6 h to prepare the organic-inorganic hybrid film.

The invention discloses a polyvinyl acetal foam material, a preparation method thereof and a cervical dilatation device. The preparation method comprises the following steps: (1) preparing polyvinyl acetal porous foam: mixing raw materials, and reacting the obtained mixture to obtain the polyvinyl acetal porous foam, wherein the raw materials consist of polyvinyl alcohol, water, a cross-linking agent, a pore-forming agent and an acidic catalyst; (2) cutting the foam; (3) drying the foam; and (4) carrying out compression molding. The polyvinyl acetal foam material has the advantages of smooth and defect-free macroscopic surface, high surface layer toughness, safety to use, good water absorption, high tensile strength and good resilience, and can be used as a cervix uteri expansion rod bodyfor the cervical dilatation device.

The invention belongs to the field of mineral-based composite materials, and particularly relates to a laminated composite material of anatase and montmorillonite obtained from the process of regulating montmorillonite micro layer recombination by means of an acid-base environment, and a preparation method thereof. Firstly, a titanium-containing precursor slurry with the pH value of 6-10 is dropped into an alkaline dispersion liquid of sodium-modified montmorillonite, then the pH value of the system is adjusted to be 3-6, a hydrothermal reaction is conducted at 120-220 DEG C so as to realize the crystallization of titanium oxide and the laminated and alternated assembly of montmorillonite microlayers and anatase, and the obtained composite has excellent catalytic and adsorption functions. The method has the advantages that the process is simple, raw materials are cheap, no organic additive or organic titanium source is used, calcination is not needed, the environmental cost is low, the cost performance of the product is high, large-scale industrial production can be realized, and the obtained product has broad application prospects in the fields like catalysis, adsorption and sewage treatment.

The invention discloses a surface chiseling protective coating for a hypersonic rocket sled slide rail and a preparation method thereof. The preparation method comprises the following steps: 1, pretreating the surface of a matrix; 2, preparing a PES/E51/polyamide system in proportion; and 3, directionally and uniformly spraying the powder onto a metal matrix by adopting a directional spraying technology. The bonding strength of the coating and a metal matrix is high, the impact resistance is good, and the chiseling phenomenon on the sliding rail can be effectively relieved.

The invention belongs to the field of polymer materials and particularly relates to a method for improving viscosity of PTFE (polytetrafluoroethylene) dispersed emulsion. The method includes the steps of dissolving ammonium salt in deionized water to obtain ammonium salt solution, and adding the ammonium salt solution into the PTFE dispersed emulsion. The ammonium salt is one or combination of any of ammonium chloride, ammonium carbonate, ammonium bisulfate, ammonium bicarbonate, ammonium sulfate, ammonium bisulfite and diammonium hydrogen phosphate. The ammonium salt added accounts for 0.01-0.50% of the weight of the PTFE dispersed emulsion. The method has the advantages that the PTFE dispersed emulsion is an emulsifier-concentrated product produced at normal temperature, the problem that the PTFE dispersed emulsion normally produced may have low viscosity is solved, the proper amount of ammonium salt is added to the dispersed emulsion before mixing, the ammonium salt and the PTFE dispersed emulsion are blended according to different ratios, and the PTFE dispersed emulsions of different viscosities are produced.

The invention provides a cobalt-doped gel and a preparation method thereof. The preparation method is achieved by a sol-gel method combined with a technical route containing an acid catalytic hydrolysis and a base catalytic hydrolysis to prepare a cobalt-doped sol. The method is as below: preparing the raw materials of tetraethoxysilane and tributyl borate under the conditions of 60-70 DEG C, pH value of 3-5, and deionized water in substoichiometry into a silicon-boron sol; meanwhile, preparing a salt solution of alkali metal, aluminum and cobalt; adding the salt solution into the silicon-boron sol by multiple times, and further hydrolyzing the borosilicate sol under basic conditions to obtain a homogeneous cobalt-doped sol; and sealing the cobalt-doped sol and allowing to stand at 80-120 DEG C for gelation, aging and drying. By changing the composition and content of raw materials, the method can obtain the cobalt-doped gel with controllable compressive strength and half-life insurance of the cobalt-doped hollow glass microspheres.

The invention discloses a silane coupling agent, a preparation method and application thereof. The chemical name of the silane coupling agent is vinyl ethoxy ethyl dilactate silane, and the preparation method includes: carrying out stirring reaction on vinyl trichlorosilane and ethanol in a molar ratio of 1:1.1-1.2 at 100DEG C-110DEG C for 2-3h to obtain an intermediate; reacting the intermediatewith ethyl lactate at 150-160DEG C for 4-6h to obtain a crude product, wherein the molar ratio of vinyl trichlorosilane to ethyl lactate is 1:2-4; heating the crude product to 90-110DEG C, also conducting vacuum pumping to a vacuum degree ranging from -0.09MPa to -0.095MPa, and keeping a constant temperature and constant pressure for 2-3h, reducing the pressure, then adding magnesium powder to neutralize the crude product to neutral, and performing rectification to obtain the vinyl ethoxy ethyl dilactate silane. According to the method, hydrochloric acid generated in the reaction process is adsorbed with ammonia water with a concentration of 10wt%, thus preventing environmental pollution; after being added into an acrylic emulsion, the silane coupling agent not only can the improve performance of a paint film, but also can improve the storage stability of the emulsion, and is pollution-free after decomposition.