170results about How to "Reduce the rate of hydrolysis" patented technology

The invention belongs to the field of advanced nano-sized porous materials and techniques, in particular relates to an ordered mesoporous metal oxide material with ultra-large aperture and a preparation method thereof. According to the invention, a block copolymer with ultrahigh-molecular-weight hydrophobic segments is used as a template agent for the mesoporous material, and based on the principle of ligand-assisted self-assembly, the microphase separation of the ultrahigh-molecular-weight hydrophobic segments from hydrophilic phases occurs during the solvent evaporation process, to form an ordered mesoscopic structure. A variety of materials are used for synthesizing the mesoporous material, such as titanium dioxide, aluminum oxide and zinc oxide. The synthesized mesoporous material retains the order of mesopores and has an extremely large aperture not less than 20 nm. The invention provides an effective and convenient method for synthesizing ultra-large aperture mesoporous materials. The material and the synthesis method of the material have wide application prospect in various fields. The method is simple, has easily-available raw materials, and is suitable for large-scale production.

The invention discloses a sludge dephosphorizing and denitrifying biological disposing method, which comprises the following parts: adsorbing pool, sedimenting pool, regenerating pool, selecting pool, dephosphorizing pool, nitrated pool, denitrifying pool and hydrolytic acidifying pool, wherein the effluent enters in the adsorbing pool firstly to blend with reflux sludge in the selecting pool; the blending liquid is drained from adsorbing pool to sedimenting pool to separate mud from water; the supernatant enters into nitrated pool to denitrify in the denitrifying pool to drain; the sediment part of sludge is proceeded anaerobic hydrolysis in the hydrolytic acidifying pool; the supernatant is inputted into dephosphorizing pool to proceed chemical dephosphorizing; the other part of sediment pool refluxes sludge into selecting pool under anaerobic environment; the composite liquid from selecting pool is input in the regenerating pool; the other part supernatant from dephosphorizing pool is input in the denitrifying pool to accelerate denitrifying action.

A process for in-situ preparing UV-resistant polyester by use of TiO2 nanoparticles includes such steps as synthesizing the hydrolysis speed controllable glycol salt of Ti, organic stabilizing it, dispersing it in diol, and polymerizing (or copolymerizing) with polyester and other monomers. Its advantage is high UV shielding effect.

The invention relates to an improved production method for salicylhydroxamic acid. The method is characterized in that a metered hydroxylamine solution is added into a reaction vessel; the PH value of a reaction system is adjusted around 12.0 by a strong alkali solution; the reaction system is heated to a temperature of between 33 and 38 DEG C, added with an emulsifier and dripped with a stock solution of menthyl salicylate and a strong alkali solution; the PH of the reaction system is always stabilized around 12.0; after solid in the solution is dissolved, the solution is kept at the temperature and performs arrest reaction; subsequently, the PH is adjusted to be between 4.0 and 5.0 by using acid; and the solution is aged at the temperature of between 20 and 30 DEG C and filtered to obtain salicylhydroxamic acid solid. As the method reduces the using level of hydroxylamine, alkali and the acid in the process of acidification simultaneously, the method improves the yield of the salicylhydroxamic acid and effectively reduces the discharge amount of methanol, thereby reducing environmental pollution.

The present invention relates to a kind of water dispersible sulfonated polyester polyol and its preparation process. It is prepared through the ester exchange reaction between dimethyl isophthalate-5-sulfonate and diol to obtain sulfonated diol, and further esterifying dewatering reaction to obtain water dispersible sulfonated polyester polyol. Owing to the homogeneous block distribution of hydrophilic sulfonated groups in main polyester chain, the product has high dispersion in water, may find its wide application in water soluble environment protecting products and may be used directly in water soluble polyurethane paint, adhesive, etc.

The invention discloses a special rice fertilizer with both soil improvement and fertilizer efficiency functions for coastal saline soil and a preparation method and application of the special rice fertilizer. The special rice fertilizer comprises the following components in parts by mass: 35-40 parts of humic acid, 15-20 parts of fulvic acid, 20-25 parts of a composite fertilizer, 15-20 parts of a silicon calcium fertilizer, 1-1.5 parts of a urease inhibitor and 1-1.5 parts of a nitrification inhibitor. According to the invention, the application method combines soil culture, root system activation, crop nourishment and fertilizer efficiency improvement, so the rice fertilizer is low in cost, stable in effect, applicable to mechanical operation, not only applicable to coastal intertidal zones, but also applicable to rice planting in saline-alkali soil in north China or even northwest inland.

A process for in-situ preparing UV-resistant polyester by use of TiO2 nanoparticles includes such steps as synthesizing the hydrolysis speed controllable glycol salt of Ti, organic stabilizing it, dispersing it in diol, and polymerizing (or copolymerizing) with polyester and other monomers. Its advantage is high UV shielding effect.

The invention discloses an air purifying photocatalyst. Anatase type titanium dioxide acts as a base body of the catalyst, and sulfur and lanthanum act as doped components, wherein the mole ratio of sulfur to lanthanum to titanium dioxide is (0.1-2) to (0.001-0.015) to 1, and the catalyst exists in a form of powder. The preparation process of the catalyst comprises the following steps of feeding the titanium source, the sulfur source and the lanthanum source according to a certain ratio, adding a dispersing agent and an inhibitor, hydrolyzing at the temperature of 10-80 DEG C with the pH of 2-7 so as to generate gel, drying at constant temperature in a drying oven, putting into a muffle furnace, firing and the like. The prepared anatase type sulfur and lanthanum codoped nano titanium dioxide powder is uniform in particle size, is controllable in particle size, is good in dispersibility, has a good catalytic degradation and purification effect on harmful gases, such as formaldehyde in an air environment, and meanwhile has a good antibacterial property.

The invention relates to the field of medical chemistry, in particular to a preparation method of narrow-distribution medium-molecular-weight hydroxyethyl starch. The method comprises the following steps of: dispersing wax corn starch with purified water, and hydrolyzing with an inorganic acid; performing gradient temperature change control and controlling the hydrolyzing degree by using dynamic viscosity; and performing hydroxyethylation, carbon removing filtration, ultrafiltration and spray drying on a hydrolysate to obtain a narrow-distribution medium-molecular-weight hydroxyethyl starch raw material. According to the method, the weight average molecular weight of the medium-molecular-weight hydroxyethyl starch is controlled more accurately, and the molecular weight distribution is more concentrated.

A process for preparing NiO nanoparticles in the form of tetragonal crystal by sol-gel method includes dissolving polyethanediol in deionized water, adding less ammonia water to regulate pH=7.5-8, dissolving nickel acetate in absolute alcohol, slowly adding the solution to said aqueous solution of polyethanediol, high-speed stirring, holding temp at 70 deg.c for 4 hr while stirring to obtain sol, filtering, drying and calcining at 500 deg.C for 2 hr.

The invention belongs to the technical fileds of metal organic framework materials and ion liquid, and discloses a method for enhancing the stability of a metal organic framework material by ion liquid. The method comprises the following steps of (a) selecting ion liquid to be used as a modifying agent of the metal organic framework material to be treated; dissolving the ion liquid into an organicsolvent; performing primary stirring so that the materials are uniformly dissolved to form a precursor solution; (b) adding the metal organic framework material to be treated into the precursor solution; performing secondary stirring so that the precursor solution and the metal organic framework material to be treated realize the sufficient contact, so that the modified metal organic framework material is obtained; after drying, obtaining the required organic framework material. The method has the advantages that the operation is simple; the applicability is high; the method is applicable tothe combination of various metal organic framework materials and ion liquid; the water stability enhancing effect is obvious; an effective path is provided for the application of the metal organic framework material in a humid environment.

The invention discloses a preparation method for plant oil-based polyurethane coated fertilizer having improved water resistance. The preparation method comprises the following steps that step 1, modification treatment is performed on plant oil polyalcohol, wherein by weight, 0.2%-5% of hydrolysis stabilizer is added into the plant oil polyalcohol and stirred at high temperature, so that modified plant oil polyalcohol is obtained; step 2, The polyurethane coated urea slow-release fertilizer is prepared, wherein large-particle urea is taken by weighing, the temperature is raised to 78-80 DEG C and is maintained, the modified plant oil polyalcohol prepared in the step 1 and lubricant are fully mixed and fused through a coating method, afterwards, the mixture and liquid isocyanate resin are quickly mixed, the surfaces of urea particles are evenly coated with the mixture, the urea particles and the coating liquid are fully mixed in a revolving drum, the coating liquid is gradually subjected to crosslinking solidification, and finally the polyurethane coated urea slow-release fertilizer is formed. Water resistance testing is performed on the prepared plant oil-based polyurethane coated urea, and a good result is obtained.

The invention discloses a method of isophthalonitrile dehydration and hydrogenation, which comprises the following steps: stripping moisture in the fixed bed with molecular dewatering screen under room temperature ; setting the air speed of dehydration at 2-5h-1; proceeding hydrogenation under the function of activator; proceeding hydrogenation in two series tubular reactor. This invention decreases the generating speed of polycondensation and dewatering speed of middle product of hydrogenation, which can prolong durability of activator.

The invention provides a preparation method for m-xylylenediamine. In the method, the m-xylylenediamine is converted into isophthalonitrile through ammoxidation; the obtained isophthalonitrile is extracted by using N-alkylpyrazole; after carboxylic acid is removed from extracted isophthalonitrile solution through resin, the isophthalonitrile solution enters a hydrogenation reactor for performing ahydrogenation reaction, to obtain a m-xylylenediamine reaction solution; and finally, the m-xylylenediamine with a high purity (99.9%) is obtained by rectifying and separating. The method has the characteristics of simple reaction flow, low energy consumption, simple operation, high m-xylylenediamine yield, high m-xylylenediamine purity and the like.

The invention discloses an ultrafine coated cadmium selenide sulfide ceramic pigment preparation method, which comprises: (1) dissolving a cadmium salt and a surfactant into water to obtain a solutionA, dissolving sodium sulfide and selenium into water to obtain an alkaline solution, adding the solution A into the alkaline solution in a dropwise manner to obtain a cadmium selenide sulfide precursor, and carrying out a hydrothermal reaction to obtain dispersed cadmium selenide sulfide; 2) adding a water glass solution into an acid solution, and controlling the pH value to obtain a silicic acidsolution; 3) adding the dispersed cadmium selenide sulfide into a zirconium oxychloride dispersion liquid, adding the silicic acid solution, adjusting the concentrations of the silicon ions and the zirconium ions, adjusting the pH value, and heating to obtain a gel; and 4) drying the gel, uniformly mixing the dried gel and a mineralizing agent, and calcining to obtain the ultrafine coated cadmiumselenide sulfide ceramic pigment. According to the invention, the particle size D100 of the pigment prepared by the method is less than 1.3 [mu]m, and the method has good condition controllability and good reproducibility, and is suitable for large-scale production.

The invention relates to a compound nitrogen fertilizer which is granular and is made from the following raw materials: calculated on the basis of total weight of raw materials of the compound nitrogen fertilizer, 30-40% of urea, 50-58% of ammonium chloride, 2.5-3.0% of diluted sulfuric acid and 0.8- 1.0% of synthetic ammonia. The inventive compound nitrogen fertilizer can efficiently increase the utilization rate of nitrogen element, prolong the period of fertilizer effect, increase crop yield, reduce the agricultural pollution of nitrogen fertilizer, and protect the environment.

The invention relates to a preparation method of a low temperature liquid phase precipitation process bismuth oxyiodide visible light photocatalyst. Organic acid assisted regulation and low temperature liquid phase precipitation process are employed to prepare the bismuth oxyiodide photocatalyst, the coordinating complexation of organic acid and bismuth ions is utilized to reduce the hydrolysis rate of bismuth ions and regulate the growth rate, structure and morphology of bismuth oxyiodide crystal nucleus, and white light LED is adopted as the simulated visible light source for photocatalyticdegradation of the dye solution. The preparation method of the bismuth oxyiodide photocatalyst provided by the invention has the characteristics of simple and feasible operation, no need for adding ofmacromolecule or surfactant, reaction under low temperature or room temperature condition, low energy consumption and short reaction time. After 80-100min irradiation by white light LED, the photocatalytic degradation of the bismuth oxyiodide photocatalyst on a dye solution almost achieves equilibrium, and after 100min irradiation by white light LED, the photocatalytic dye degradation efficiencyof the bismuth oxyiodide photocatalyst on 10mg / L and 50mg / L dye solutions respectively reach 75-96% and 35-46%, and after five cycles of utilization, the photocatalytic dye degradation rate of the bismuth oxyiodide photocatalyst is 70-85% of the first photocatalytic dye degradation rate, therefore the bismuth oxyiodide photocatalyst can be widely applied in visible light photocatalytic degradation, dye wastewater pollution treatment and other fields.

The invention relates to a preparation method for a novel negative electrode material of a lithium ion battery, belongs to the technical field of a lithium ion battery material, and aims to provide a preparation method for a novel nanometer SnO<2> / C composite negative electrode material of the lithium ion battery. The preparation method for the novel negative electrode material of the lithium ion battery comprises the steps of dissolving a tin source into a mixed acetone water system, stirring until the tin source is fully dissolved, then adding urea and polyvinylpyrrolidone, stirring for 2-5h, then adding expanded graphite, next, moving the solution to a hydrothermal reaction kettle, and performing hydrothermal synthesis at a temperature of 90-130 DEG C for 2-10h, naturally cooling the reaction kettle to the room temperature, and performing suction filtration, washing and drying on the obtained product, and baking under an inert atmosphere at a temperature of 600 DEG C for 3h to obtain the nanometer SnO<2> / C composite negative electrode material of the lithium ion battery.

The invention discloses a preparation method of lithium-ion battery negative electrode molybdenum disulfide and the application thereof. The preparation method comprises the following steps: mixing sodium molybdate dehydrate, thiourea, water and diethylene glycol to carry out a hydrothermal reaction, separating the product after the hydrothermal reaction, performing calcination treatment on the separated solids in argon-hydrogen mixed gas, and finally cooling to a room temperature, so as to obtain the lithium-ion battery negative electrode material molybdenum disulfide. According to the preparation method disclosed by the invention, the hydrolysis rate of the thiourea is reduced by adding the diethylene glycol, so that the aim of controlling the reaction rate of sodium molybdate is achieved. Two-dimensional molybdenum disulfide nanosheets are assembled into a three-dimensional layered flower structure, so that the specific advantages of the molybdenum disulfide can be preserved, the condition that the molybdenum disulfide is irreversibly overlapped can be avoided, and a larger contact area is provided.

The invention relates to kaoline alkaline static bleaching technology. The technology comprises: evenly mixing classified kaoline ore slurry and rongalite, standing the mixture for a while, adding a regulator into the mixture, controlling the ore slurry pH value to between 3 and 5, and evenly stirring the mixture to obtain the product. The technology has the advantages of simple operation, easy realization in production and obvious effect, can be widely used in kaoline processing enterprises and has great popularization value and application prospect.

The invention discloses a method for preparing bendamustine hydrochloride freeze-dried preparation. In the method, the bendamustine hydrochloride is dissolved in medicinal ethanol first and then mixed with water-containing solution, and the mixture is stored at low temperature, so long-time contact between the bendamustine hydrochloride and water is prevented, and the hydrolyzation speed of the bendamustine hydrochloride is reduced because of the low-temperature storage. Moreover, for improving the situation that stable freeze-dried preparation with high re-dissolubility and beautiful appearance cannot be obtained by using organic solvent ethanol in the prior art, the inventor, through deep study, finds that the stable freeze-dried preparation with high re-dissolubility and beautiful appearance can be realized by using the safe medicinal ethanol. The bendamustine hydrochloride freeze-dried preparation prepared by the method has the advantages of low impurity content, low organic solvent residue content, high stability, beautiful appearance, high re-dissolubility and applicability to clinical application and industrial production.

The invention relates to a preparation method for a hollow titanium dioxide / polyacrylate composite film with an insulation performance. A template method for preparing hollow titanium dioxide needs to be finished by two steps, and the process is complex. The preparation method disclosed by the invention comprises the following steps: dispersing polystyrene microspheres in absolute ethyl alcohol and ultrasonically treating to form mixed solution A; adding butyl titanate in absolute ethyl alcohol to form mixed solution B; dripping the mixed solution B and ammonia water into the mixed solution A; heating and stirring in a water bath to obtain a white turbid liquid, carrying out a centrifugal treatment, washing and drying to obtain hollow titanium dioxide particles, ultrasonically dispersing the hollow titanium dioxide particles in distilled water, and mixing and stirring with a polyacrylate emulsion to obtain a composite emulsion; then taking the composite emulsion in a polytetrafluoroethylene plate and carrying out film formation to obtain the hollow titanium dioxide / polyacrylate composite film. The preparation method disclosed by the invention realizes one-step synthesis for hollow titanium dioxide with a regular structure, and overcomes the defect of a complex process; moreover, the hydrolysis speed of butyl titanate is reduced through the ammonia water, the uniform coating of titanium dioxide is realized, and hollow titanium dioxide with the regular structure is formed.

A biodegradable resin composition comprising at least one biodegradable organic polymeric compound, a flame retardant additive containing a phosphorous compound, and a hydrolysis inhibitor capable of inhibiting the hydrolysis of at least one organic polymeric compound. As an aliphatic polyester resin, use is made of polylactic acid, polycaprolactone, polyhydroxybutyric acid, polyhydroxyvaleric acid, polyethylene succinate, polybutylene succinate, polybutylene adipate, polymalic acid, microbially synthesized polyester or a copolymer containing at least one of these. As a polysaccharide, use is made of cellulose, starch, chitin, chitosan, dextran, a derivative of any of these or a copolymer containing at least one of these.

The invention discloses a COS and CS.2. hydrolyst and its application in the field of desulfurizing agent and its application which charges ammonium salt onª†-Al.2.O.3. to prepare the catalysis.

The invention relates to a preparation method of an adsorbent containing SnO2 / Sb2O5. According to the method, SbCl3 with a stable chemical property and low toxicity is taken as a Sb source, sodium thiosulfate pentahydrate, namely SnCl4, is utilized as a Sn source, and a SnO2 / Sb2O5 binary composite oxide is prepared. The preparation method comprises the following steps of oxidizing Sb<3+> as Sb(V) in a non-water system taking alcohol as a solvent by adopting the combination of H2O2 oxidation and ultraviolet irradiation, further carrying out hydrolytic precipitation on Sb(V) and Sb<4+> by utilizing a small amount of water introduced by utilizing H2O2 solution as a reactant, and forming a binary SnO2 / Sb2O5 composite oxide. The method provided by the invention has the advantages that the hydrolyzing speed of Sb<3+> is slow, the generation of the Sb2O3 is effectively controlled, the Sn / Sb2O5 binary composite oxide with the Sb<3+> oxygenation efficiency being 100% is obtained, the adsorbent can remove the radioactive isotope Co ions and a complex thereof and stable isotope Co ions and a complex thereof, and the adsorptive property of the SnO2 / Sb2O5 binary composite oxide and pure Sb2O5 obtained by the introduction of Sb is improved by 200 times.

The invention provides alkyl polyoxyether with a structure as shown in a formula (I) or formula (II) which is described in the specification. The invention also provides a preparation method for the alkyl polyoxyether, a polycarboxylate superplasticizer prepared with the alkyl polyoxyether as a polymerization monomer and a preparation method for the polycarboxylate superplasticizer. The alkyl polyoxyether provided by the invention contains a phenyl ring which exerts great steric hindrance effect in a polymer molecule in preparation of the polycarboxylate superplasticizer, so the prepared polycarboxylate superplasticizer is endowed with better slump loss resistance. The polycarboxylate superplasticizer provided by the invention uses the alkyl polyoxyether as the monomer, has the both advantages of high water-reducing rate and high slump loss resistance, and is convenient to use and obviously reduced in the doping rate in concrete; so cost for production and construction is reduced, requirements of environmental protection are better met, and immense economic and social benefits can be produced.

The invention discloses an environment-friendly high-temperature-resistant hybrid organic silicon resin with a zirconium-doped main chain. The organic silicon resin is characterized in that the structural formula of the organic silicon resin is as follows: (R2SiO2 / 2) x (RSiO3 / 2) y (ZrO4 / 2) z (S) k, in the formula, R2SiO2 / 2, RSiO3 / 2 and ZrO4 / 2 respectively represent D unit siloxane, T unit siloxaneand an organic zirconium source; x, y, z and k respectively represent the number of structural units of R2SiO2 / 2, RSiO3 / 2, ZrO4 / 2 and S; R independently represents a methyl group or a phenyl group; Sis selected from one of siloxane groups, -Si (OH) 3, -RSi (OH) 2, -R2Si (OH), -R2SiOR, -RSiOR2 and-SiOR3, and ZO4 / 2 is selected from an organic zirconium source. By adopting a novel modified copolymerization mode, the resin material has better high temperature resistance than existing silicon resin material, and can be used as matrix resin for preparing a composite material and a high-temperature-resistant adhesive.

The invention provides a preparation method and application of a graphene / lithium titanate composite material. The preparation method comprises the following steps: preparing a titanium source dispersion liquid from tetrabutyl titanate, graphene, P123 and tert-butyl alcohol, and preparing a lithium source solution from lithium acetate dihydrate, deionized water and tert-butyl alcohol; transferring the titanium source dispersion liquid to a microwave reactor and heating the titanium source dispersion liquid till reflux, adding the lithium source solution to react for a certain time, cooling the reactant, removing a solvent and then drying the product, thus obtaining a graphene-based lithium titanate precursor; placing the obtained graphene-based lithium titanate precursor in a tube furnace to be calcined at a certain temperature for a certain time under the protection of an inert gas, thus obtaining the graphene / lithium titanate composite material. The obtained active material, acetylene black and PVDF (polyvinylidene fluoride) are mixed uniformly to coat an aluminium foil to prepare an electrode slice of a button cell, finally a half cell is assembled in a glove box, charge and discharge performances are tested, the half cell is made from the active material and the performances are detected. Through detection, the capacity of graphene / lithium titanate under the condition of 1C rate is still 140mAh / g, can still keep more than 99% of capacity after circulation for 1000 times, and has excellent performances.

This invention involves a kind of stannic oxide microballoon with controllable crystallite dimension and its preparation method and application. This stannic oxide microballoon is composed of stannic oxide microcrystal with fine crystallinity through self-assembly. The grain size of stannic oxide microcrystal is adjustable within range of 5-30nm. The diameter of stannic oxide microballoon is 200-400nm and its specific surface area >40m2 / g; During preparation, add concentrated hydrochloric acid and tin source into the mixed solution of normal propyl alcohol and water in order, forming the transparent homogeneous solution; Conduct solvothermal reaction; After the reaction ends, take out the sediment, wash and separate it. Being compared with the current technology, this invention has simple and easy process route, which does not need surface active agent. And the multilevel structure Sno2 microballoon with equally distributed dimension can be gotten through one-step method, which is composed of stannic oxide microcrystal through self-assembly. Also, the dimension of Sno2 microcrystal can be adjusted and controlled through adjusting the alcohol / water proportion in the reaction system. The microballoon has features of high specific area and submicron level dimension, which has wide application prospect in areas of solar cell, lithium ion battery and photocatalysis.