33results about How to "Solve easy hydrolysis" patented technology

The invention discloses a method for preparing gradient niobium-tungsten-tantalum-doped cobaltosic oxide and belongs to the technical field of lithium ion batteries. The method comprises the followingstep: by taking a cobalt solution of a certain solution as a cobalt source, a sodium hydroxide solution as a precipitant, an ammonia water solution as a complexing agent, a hydrogen peroxide solutionas an oxidant, and a niobium-tungsten-tantalum chloride absolute ethyl alcohol solution as a doping solution, putting the doping solution into a reaction kettle to be subjected to reactions in a dispersion liquid addition mode in a reaction process, thereby obtaining a gradient niobium-tungsten-tantalum-doped cobaltosic oxide product. By adopting the method that the niobium-tungsten-tantalum chloride is dissolved into absolute ethyl alcohol to be used as the doping agent solution, the problems that the niobium-tungsten-tantalum chloride is liable to hydrolyze can be well solved, and uniform gradient distribution of niobium-tungsten-tantalum elements in a prepared product can be ensured. The doped cobaltosic oxide product prepared by using the method disclosed by the invention has a dopingamount of 0.5-1.0%, has doping elements in uniform gradient distribution, has laser granularity of 5-8mu m, a tap density greater than or equal to 2.5g / cm<3>, a specific surface area of 1.0-3.0m<2> / g, and has a blocky or sphere-like morphology.

The invention discloses a method for extracting persimmon leaf flavone with content of more than or equal to 85 to 98 percent from a persimmon leaf. The method comprises the following steps of: grinding the persimmon leaf; performing microwave extraction for 1 to 5 times by using water in an amount which is 2 to 10 times that of the persimmon leaf, wherein the pH value of the water is 10 to 14, extraction at each time lasts for 10 to 60 minutes and the extraction temperature is between 30 and 60 DEG C; combining extracting solution and adjusting the pH value to be 5 to 7; adding a flocculation clarifying agent; stirring, standing and filtering; performing ultrafiltration membrane purification and reverse osmosis (RO) membrane dehydration on the filtrate; adjusting the pH value of concentrated solution to be 4 to 5; extracting the obtained concentrated solution by using ethyl acetate for 2 to 6 times; concentrating the extraction liquid; and drying to prepare the persimmon leaf flavones. By the method, the process is simple; the production cost is low; the extraction time is short; environmental pollution is small; and the flavonoids content of the extract is high and can reach 85 to 98 percent.

The invention discloses a method for preparing 1-butene through selective hydrogenation of C4 raffinate by adopting a silver carbonized Raney copper catalyst. The method comprises: in the presence of hydrogen, at a reaction inlet temperature of 30°C to 60°C and a reaction pressure of 0.6 to 3.5MPa, in a fixed-bed reactor, the liquid-phase C4 fraction is contacted with a silver carbonized Raney copper catalyst for hydrogenation reaction to prepare 1‑Butene. The non-noble metal catalyst used in the invention can effectively reduce the cost of the catalyst; the activated silver-carbonized Raney copper alloy particles have highly dispersed copper particles, the utilization rate of active components is high, the hydrogenation activity is high, and the operating space velocity is high.

The application discloses a shrink oil cathodic electrophoretic coating and a preparation method thereof. Add isocyanate and methyl isobutyl ketone into a reaction vessel, pass nitrogen gas, stir and heat at the same time; Terminal polydimethylsiloxane, heat after the dropwise addition, and then cool down after the first reaction; continue to drop ethylene glycol butyl ether into the reaction vessel, heat, and wait for the second reaction to finish , cool down for later use; add epoxy resin to another reaction vessel, add the prepared above-mentioned materials into this reaction vessel, stir, heat, then add acetic acid to neutralize the resin; stop heating, add pure water, and disperse evenly Finished product is prepared. The oil shrinkage electrophoretic paint of the present invention has excellent multiple continuous oil shrinkage effects and hardness, and has the advantages of good original paint stability, easy application, and the like.

The invention discloses synthesis and application of a solid acid catalyst and particularly relates to a solid acid catalyst for preparation of sodium isophthalate diethylene glycol 5-sulfonate via direct esterification and preparation and application of the solid acid catalyst; the solid acid catalyst comprises an inorganic lamellar structure material and an intercalation element; the inorganic lamellar structure material may be one or any of montmorillonite, mica, purified bentonite, kaolin, graphite, hydrotalcite and a tetravalent metallic insoluble salt; and the intercalation element may be one or any of Ti, O, H and C. The solid acid catalyst has high catalytic activity in the production of sodium isophthalate diethylene glycol 5-sulfonate from 5-sulfoisophthalic acid monosodium salt and diethylene glycol via direct esterification, the catalyst is easy to separate from the product after reaction, and the catalyst is reusable after being activated.

The present invention relates to the field of polyimide, in particular to a preparation method of polyimide resin, comprising the following steps: S1, after dissolving the first batch of polydiamine in a solvent under an inert gas atmosphere, heat the polyimide at 30°C and In the following low temperature environment, add 105‑110% of the first batch of polyvalent diamine molar total polyvalent dianhydride to polymerize first to form a resin solution, and control the viscosity of the resin solution at 50000‑70000cps; Gradually raise the temperature inside, add the second batch of polydiamines in batches, first more and then less gradually, until the viscosity of the resin solution is 180000-200000cps; S3, add fluorine-containing end-capping agent and mix evenly, and obtain polyimide after high-vacuum defoaming Resin solution, the polyimide coating formed has strong thermal stability, and the thermal expansion coefficient is close to that of the base film.

The invention discloses a preparation method of niobium, tungsten and tantalum-doped cobalt trioxide and belongs to the technical field of lithium ion batteries. The preparation method is characterized in that the synthetic reaction is performed by taking a certain concentration of cobalt solution as a cobalt source, a sodium hydroxide solution as a precipitating agent, an ammonia aqueous solutionas a complexing agent, a hydrazine hydrate solution as a reducing agent and a niobium, tungsten and tantalum chloride anhydrous alcohol solution as a doping agent; in the reaction process, the niobium, tungsten and tantalum chloride anhydrous alcohol solution is added in a reaction kettle in a dispersive liquid adding manner to participate in the reaction; after the end of the synthetic reaction,a synthetic product is oxidized into hydroxyl cobalt oxide by utilizing a hydrogen peroxide solution under the condition of a certain pH value, and then a mixture is washed, dried and calcined to obtain a niobium, tungsten and tantalum-doped cobalt trioxide product with uniformly-distributed doped elements; the production efficiency is high. The niobium, tungsten and tantalum-doped cobalt trioxide product prepared by the preparation method disclosed by the invention has a doping amount of 0.5-1 percent, has the uniformly-distributed doped elements, has a laser particle size of 15-20 mum, a tap density of more than or equal to 2.5 g / cm<3> and a specific surface area of 1.0-3.0 m<2> / g and has a massive or nearly-spherical appearance.

The invention belongs to the field of synthetic resins, in particular to a water-based acrylic resin and its application. The water-based acrylic resin provided by the present invention is prepared according to the following method: a) under the presence of an initiator, the comonomer is polymerized in an organic solvent to obtain a reaction solution; the comonomer includes acrylic acid, methyl methacrylate, Methacrylic acid, hydroxyethyl acrylate, butyl methacrylate and glycidyl tert-carbonate; b) the reaction solution is neutralized and then mixed with water to obtain a water-based acrylic resin. The present invention successfully solves the problem that the water-based acrylic resin is easily hydrolyzed under alkaline conditions by adopting various monomers to chemically modify the water-based acrylic resin; and the modified water-based acrylic resin also has good anti-ultraviolet performance. After it is formulated into a paint, the aging degradation of the paint film under ultraviolet irradiation can be significantly delayed.

The invention discloses a method for preparing lithium niobate nanometer powder at low temperature by using a citric acid gel method, which relates to a preparation method of lithium niobate. The present invention is carried out according to the following steps: a, Nb 2 o 5 Dissolve in HF, then add excess ammonium oxalate solution to it, after mixing well, add ammonia water dropwise to the solution to form white Nb(OH) 5 Precipitate, the precipitate is aged, filtered and washed, dissolved in citric acid aqueous solution to form a light yellow Nb-citric acid solution; b, lithium carbonate is added to the Nb-citric acid solution, stirred to fully dissolve ; c, adding excess citric acid solution to the solution; d, then adding ethylene glycol to the above solution, stirring evenly to form a lithium niobate precursor solution; e, heating the solution to obtain a viscous gel Solid; f, finally calcining the gel to obtain nanometer LiNbO 3 Powder. The invention has the advantages of low cost, little environmental pollution and simple process.

The invention belongs to the technical field of medicines, and specifically relates to prasugrel hydrobromide tablets and a preparation method thereof. The tablets and the preparation method are characterized in that: raw materials are pretreated or not pretreated before the preparation of the tablets, such that the raw materials contain a certain amount of an organic solvent; other auxiliary materials are added to the raw materials; and the materials are pressed into tablets, such that the prasugrel hydrobromide tablets are prepared. With the prasugrel hydrobromide tablets provided by the invention, the medicine stability is substantially improved, the dissolution rate and the bioavailability are good, and the adverse reaction of the medicine is reduced.

The invention provides a method for net forming of aluminum nitride ceramics, which comprises the following steps: S1, weighing 95 wt% of aluminum nitride powder, 5 wt% of yttrium oxide powder and sorbitol glycidyl ether according to the proportion, and then adding a non-water-based organic solvent according to the proportion of 40-60% of the volume content; s2, fully mixing and ball-milling the materials to form non-water-based ceramic slurry; s3, tetraethylenepentamine is added, ball milling is carried out again, then defoaming is carried out, ceramic slurry is obtained, the ratio of sorbitol glycidyl ether to tetraethylenepentamine is (3-5): 1, and the total adding amount of sorbitol glycidyl ether and tetraethylenepentamine is 1-5 wt% of the weight of the ceramic powder; s4, injecting the ceramic slurry into a mold, and then demolding and drying to obtain a blank body; s5, degreasing the blank at high temperature; and S6, performing high-temperature sintering on the degreased blank.

The invention discloses oil-shrinking cathodic electrophoretic coating and a preparation method thereof. The preparation method comprises the following steps: adding isocyanate and methyl isobutyl ketone into a reaction container, inflating nitrogen, and stirring while heating; dropwise adding active H-containing terminated polydimethylsiloxane into the reaction container, heating after the completion of dropwise addition, and then cooling after the completion of a first reaction; continuing to dropwise add ethylene glycol butyl ether into the reaction container, heating, and then cooling foruse after the completion of a second reaction; adding epoxy resin into another reaction container, adding the prepared material into the reaction container, stirring, heating, and then adding acetic acid to neutralize resin; and stopping heating, adding purified water, and dispersing uniformly to obtain a finished product. The oil-shrinking electrophoretic coating has an excellent multiple and lasting oil-shrinking effect and hardness, and has the advantages of good original paint stability, easy application and the like.

The invention discloses a method for synthesizing terpineolene 4,8-epoxide. The method uses terpineolene, a downstream product of turpentine, as a raw material, mixes it evenly with a solvent, a catalyst and a catalyst auxiliary agent, and then mixes it with A solution containing oxidant hydrogen peroxide is reacted to synthesize terpinolene 4,8-epoxide. The oxidation selectivity of the catalytic oxidation system adopted in the present invention is high, the catalyst is easy to recycle, the reagents used are environmentally friendly, the process is safe, and it is suitable for industrialized production. Under the optimal conditions of the experiment of the present invention, the conversion rate of terpinolene can reach more than 95%, and the product selectivity is more than 85%.

The invention relates to the field of organic borate compounds, in particular to a preparation method of borate with polymerizable double bonds. The preparation method is characterized by comprising the following steps: 1, subjecting boric acid and triethanolamine to an esterification reaction in an organic solvent I by using a solvent method to generate triethanolamine borate; and 2, dissolving the triethanolamine borate synthesized in the step 1 in an organic solvent II, and carrying out an acylation reaction on the triethanolamine borate and butadiene diacid to obtain the borate with the polymerizable double bonds. Compared with the prior art, the method has the advantages that through design of a molecular structure, triethanolamine borate is further subjected to the acylation reactionin the solvent on the basis of generation of triethanolamine borate; two elements including a boron element and a nitrogen element and active groups such as carboxyl groups, unsaturated double bondsand amide bonds are introduced into the same molecule so as to achieve good coupling agent application performance, so the problem that the borate is easily hydrolyzed is solved; and the borate is allowed to have good compatibility with polymers due to the containing of amino groups and the double bonds.

This invention relates to a preparation method of boron modified phenol-formaldehyde resin used for imitation silk. The steps: mix formaldehyde and carbolic acid, whip uniformity, add oxalic acid for regurgitation, stand ing, heating-up underlayer solution to 110 - 120 deg under 8 to 12.6 kpa pressure, take reaction for 1 to 1.5 hours, then use absolute ethyl alcohol of 3 to 4 times quality for dissolution, wet distillation, then add borate, carry out wet distillation, take out lower resin and use absolute ethyl alcohol to dissolve, then use ultrasonic to disperse uniformity, finally at 20 to 25.3 KPa vacuum degree and 100 to 200 deg.C for 23 to 25 hours, gin waterproof boron modified phenol-formaldehyde resin used for imitation silk. This invention introduce a given mass of boron in bakelite, at the same time solve the problem of boron modified phenol-formaldehyde resin easily dissolve in water.

The invention discloses fully-degradable polylactic acid fiber melt-blowing nonwoven and a preparation method thereof. The nonwoven is characterized in that polylactic acid slices are spinned at a melting temperature; and fiber filaments stretched by hot air is formed by self-adhesion and hot rolling, wherein, the even fineness of the nonwoven fiber filaments is 0.52-5mu m, the surface density is5-50g / m2, the thickness is 0.1-0.9mm, the ratio of longitudinal strength to transverse strength is 0.9-1.2, and the filtering efficiency to bacteria is above 95%. The filtering efficiency of the melt-blowing nonwoven product of the invention to bacteria reaches up to 95% which is far higher than that of the existing similar products. The invention solves the problem of low and uneven longitudinalstrength and transverse strength of the existing melt-blowing nonwoven. The invention lowers the melt-blowing die head temperature to 180-185 DEG C and brings optimal spinning effect. The technology of the invention is easy to operate and control, has favorable technical stability and can carry out industrial production.