266results about How to "The reaction conditions are mild and controllable" patented technology

The invention discloses a high temperature resistant modified starch filtration reducing agent and a preparation method thereof. The modified starch filtration reducing agent and the preparation method comprise that: with starch, a phenolic compound, alkenyl amide and alkenyl sulfonic acid as raw materials, an oil phase solution as a continuous phase and a nonionic surfactant as an emulsifying agent, and under catalytic actions of a reduction substrate and a hydrogen acceptor substrate, a starch graft copolymer is generated through a reaction. The filtration reducing agent provided by the invention is resistant to temperature of up to 175 DEG C, and simultaneously also has good salt and calcium resistance capabilities; and the preparation method is simple and easy to implement, and has mild and controllable reaction conditions, high grafting efficiency, fast reaction speed and low cost.

The invention relates to a method for preparing a sulfonated carbon solid acid catalyst, which uses a sulfonic aromatic compound to replace sulfuric acid. The method uses glucide as a raw material and an aromatic compound with sulfonic group as a sulfonating reagent to generate the carbon solid acid catalyst in one step through solvent heat treatment at a temperature of between 150 and 200 DEG C. The method has the advantages that the prepared solid acid has controllable surface acid content and good stability; the glucide as the raw material has rich resource and low price; the reaction condition is mild, and the preparation process is simple; and concentrated sulfuric acid or fuming sulfuric acid are not adopted as the sulfonating reagent, so equipment can be corroded less. The solid acid can be used as the catalyst of hydrolyzation of cellulose, alkylation reaction, biodiesel preparation and other reactions. Compared with the prior sulfuric acid catalyst, the catalyst has the advantages of non corrosion, easy separation, reusage and non production of waste acid or sewage, and has better advantages in the application field with special requirement, such as fine chemistry industry and pharmaceutical synthesis.

The invention relates to a method for preparing nano boron powder. B203, Mg and KBH4 are taken as reaction materials, and mixed at the protection of argon at the temperature of 700-850 DEG C to trigger the self-propagating reaction; and the obtained reaction rough product is separated and purified to obtain the nano boron powder. The method of the invention has the following beneficial effects: (1) reactivity diluent KBH4 is added in a B203/Mg system on the basis of synthesizing boron powder by traditional magnesiothermic reduction and by virtue of endothermic reaction, so as to control heat effect of the reaction system, realize energy conserving effect and control self-propagating reaction temperature, thus restraining side reaction and by-product impurities, effectively improving the purity of the product and acquiring amorphous boron powder with higher purity; (2) reaction product particles are avoided from sintering and agglomerating due to the generation of H2O and H2; realizing to refine and control boron powder granularity to prepare the nano boron powder; and (3) the method of the invention has moderate and controllable reaction conditions, simple process and reduced energy consumption, and is suitable for industrial production.

The invention discloses a breathable and waterproof multi-response fabric sensor. The sensor comprises a flexible elastic fabric base body, an interface layer, a functional layer and a protective layer from inside to outside, wherein the interface layer is a polydopamine layer, the functional layer is an MXene network, the protective layer is polydimethylsiloxane. In the invention, the elastic fabric is subjected to polydopamine interface modification, then the elastic fabric is subjected to dipping modification by using an MXene dispersion liquid, and finally hydrophobic treatment is performed by using the polydimethylsiloxane to obtain the MXene-based fabric sensor. The sensor disclosed by the invention is breathable and waterproof, and can show corresponding resistance response under different external strains and temperatures; the preparation method is simple, large-scale production can be achieved, and the multi-response fabric sensing device has excellent sensing performance andgood environmental stability and is of great significance in the field of intelligent wearable clothes.

The invention discloses a preparation method of an alpha-MnO2 catalyst for catalyzing oxidation of volatile organic compounds, relates to the preparation method of the alpha-MnO2 catalyst, and aims tosolve the problems that an existing manganese oxide catalyst is low in reaction activity and poor in stability and water resistance. The preparation method comprises the following steps: preparing apotassium permanganate solution and an ethylene glycol solution with the pH value of 7.0-12.0, mixing, reacting under water bath and stirring conditions, adding ethylene glycol, reacting under water bath and stirring conditions to obtain a turbid liquid, and sequentially filtering, washing, drying and calcining. According to the method, the alpha-MnO2 catalyst is obtained by taking the ethylene glycol as a reducing agent and potassium permanganate as a manganese source for the first time under the condition of room temperature or relatively low temperature, and compared with a traditional high-temperature hydrothermal method and a reflux method, the catalyst disclosed by the invention has the advantages of high activity, high stability and water resistance. The method is suitable for preparing the alpha-MnO2 catalyst.

The invention provides a hydrophilic modification method of PVA to polyester fiber, which belongs to the high-molecular technical field. The method comprises the following steps: pretreating the polyester fiber by a sodium hydroxide solution with 3-10% of mass fraction for 1 hour, wherein the solid liquid ratio is 1: 50, flushing and drying the polyester fiber, then placing the polyester fiber in a reaction container filled with a PVA solution with 0.2-0.3% of mass fraction, then adding acetate, methanol and sulfuric acid according to volume ratio of 3: 2: 1 in the reaction container, wherein the volume fraction of acetate, methanol and sulfuric acid are 10% respectively, adding GA with 25% of mass fraction in the reaction container, wherein the mol ratio of GA to PVA is 1: 4, performing mechanical stirring and reacting for 1-2 hours under the temperature of 50-70 DEG C, washing by water after the reaction is completed, and drying. Through representation and determination, the surface of the modified polyester fiber uniformly contains PVA, the contact angle is less than 10-50 DEG, hydrophilcity of the polyester fiber is greatly improved, the effect is stable, and the polyester fiber can be widely used in the fields of regeneration resource papermaking, clothes, decoration and industry and agriculture.

The invention provides a hydrophilic modification method for a polyester fiber by using sodium alginate, which belongs to the technical field of high polymer. The method comprises the following steps: stirring and pretreating the polyester fiber by using a sodium hydroxide solution with a mass fraction of 3 to 10% in a reaction container at a temperature of 70 to 90 DEG C for 1 h, wherein a solid-liquid ratio is 1: 50, then carrying out flushing with water after completion of a reaction and carrying out drying; and preparing a sodium alginate solution with a mass fraction of 1 to 4%, standing the sodium alginate solution at a temperature of 4 DEG C for 1 h, allowing sodium alginate to expand after sufficient water absorption, placing the sodium alginate solution in the reaction container, adding the dried polyester fiber into the reaction container, carrying out mechanical stirring at normal temperature for 1 to 2 h, adding a calcium chloride solution with a mass fraction of 2% during stirring and after completion of a reaction, successively carrying out flushing with water and then drying at 70 DEG C for 1 h. According to determination results, the contact angle of the modified polyester fiber is less than 10 to 60 DEG, hydrophilicity of the polyester fiber and products thereof are greatly improved, and the modified polyester fiber can be extensively applied to fields like papermaking with renewable resources, clothes, decoration, the industry and the agriculture.

The invention relates to a CT contrast agent with gold nanoparticles wrapped with zwitter-ion modified dendrimer and a preparation method and application of the CT contrast agent. The surface of the dendrimer is modified with the zwitter-ion carboxybetaine acrylic amide (CBAA), and the gold nanoparticles are wrapped with the dendrimer, wherein the dendrimer is fifth-generation polyimide dendrimer G5.NH2. The preparation method comprises the steps that the CBAA and the fifth-generation polyimide are stirred and reacted at the room temperature to obtain CBAA-G5.NH2, an HAuCl4 solution is added, NaBH4 is added for reduction, triethylamine and acetic anhydride are added finally, and then the CT contrast agent is obtained. Compared with a traditional contrast agent modified by mPEG, the consuming quantity of in-vitro macrophages is low, protein adsorption in the protein adsorption resistance experiment is low, the in-vivo rat blood circulation time is longer, liver gathering in the mouse CT experiment is low, the renal metabolism is slower, and the CT contrast agent can also be used for rat blood pool radiography and rabbit lymphonodus VT imaging.

The invention provides an acidic texturing solution for texturing of a polycrystalline silicon chip and a using method thereof. The acidic texturing solution is characterized in that: when the acidic texturing solution is used for surface texturing of the polycrystalline silicon chip for a solar cell, excellent texturing effect can be achieved. The technical problems of environmental pollution of the texturing solution and textured surface non-uniformity caused by instable states of the texturing solution and the process conditions in the prior art are solved.

The invention discloses dicyclohexylmethylmethane-4,4'-diisocyanate prepolymer used for paint curing agent and preparation method thereof, the prepolymer is mainly prepared from (A) 20-50 mass parts of dicyclohexylmethylmethane-4,4'-diisocyanate; (B) 5-60 mass parts of polyalcohol composition; (C) 30-300 mass parts of organic solvent with boiling point less than 200 DEG C; and selective (D) 0.01-1 mass part of organic metal catalyst; and the prepolymer is used for curing agent for alkyd resin paint and has better weathering resistance, yellowing resistance, chemicals resistance and water resistance.

The invention relates to the technical field of drug synthesis, in particular to a sugammadex sodium impurity and a preparing method thereof. A chemical structural formula of the impurity is shown ina formula I. The preparing method comprises the following steps that 1, sugammadex sodium is put in an aqueous solution, and after a reaction is carried out for a period of time at a certain temperature in the presence of an oxidizing agent, oxidation is conducted to generate a compound with the formula I, wherein the compound is a mixture of a compound II and a compound III; 2, the obtained mixture of the compound II and the compound III is subjected to preparative separation to obtain the single compound II and the single compound III. The preparing method has the advantages that operation is convenient, the reaction condition is mild and controllable, the stability of a reaction is high, and a reaction product is high in yield and purity; moreover, the compound with the formula I can provide an impurity reference substance which meets the requirement for quality control over the sugammadex sodium.

The invention belongs to the field of chemical synthesis, and relates to a method for preparing a compound zolpidem. The invention provides an effective new method for preparing zolpidem by a trimaceral serially reaction. The method for preparing the zolpidem provided by the invention has the advantages that the reaction step is short, the condition is moderate, atom economy and environmentally friendly are achieved, the yield is high, the cost is low, industrialized production is applicable, and the defects in the prior art that the synthetic route is long and the cost is high are overcome.

The invention discloses a catalyst for synthesis of amino-terminated polyether. The catalyst is load type, the carrier material has a porous structure, metal Ni and Co are taken as the main active components of the catalytic material, and any two of Cr, Fe and Mo are mixed in any proportion to serve as the assistant active component. The invention discloses a preparation method of the catalyst and application of the catalyst to synthesis of amino-terminated polyether. The catalyst provided by the invention is used for synthesis of amino-terminated polyether, and also has high conversion rate and high primary amine selectivity that are both greater than or equal to 99.0%. By using the catalyst provided by the invention, the reaction cost is lowered, and the catalyst has good catalytic effect in a batch kettle and a fixed bed reactor, and can meet different process requirements. By adding the catalyst, the reaction can be milder and more controllable, the temperature is lower than or equal to 230DEG C, the pressure is less than or equal to 10MPa, and the risk of the operation process is reduced.

The invention discloses a near-infrared silver-indium-selenium quantum dot and a preparation method thereof. The preparation method comprises the following steps: (1) dissolving cupric chloride or silver acetate, indium acetate, sodium hydrogen selenide and 3-mercaptopropionic acid according to the molar ratio of 1:1-5:10-20:34-36, so as to obtain a mixed solution, wherein the concentration of cupric chloride or silver acetate is 0.7-0.9 mmol/L; and (2) adjusting the pH value of the mixed solution obtained in the step (1) to 8-9, then heating the mixed solution at 93-98 DEG C for reaction for 55-65 min, and cooling to room temperature, so as to obtain the near-infrared silver-indium-selenium quantum dot. The prepared quantum dot has the advantages of being nontoxic, simple in method, mild and controllable in reaction conditions, short in reaction time, good in reappearance and the like. The prepared quantum dot is widely applicable to cell and tissue imaging as a fluorescent marker, and also is applicable to in vivo imaging research.

The invention discloses an electrochemical preparation method of a BiOBr/Bi12SiO20 composite film photocatalyst and application of the BiOBr/Bi12SiO20 composite film photocatalyst, belonging to the fields of in-situ preparation of Bi-based composite materials, solar photocatalyst immobilization technology and artificial photosynthesis. The problems that existing synthesis methods are high in energy consumption and have difficulty in separation of powder catalysts from reaction systems can be solved. According to the invention, a BiOBr/Bi12SiO20 immobilized composite film is through one-step electrochemical synthesis at room temperature with a Bi plate, NaBr and Na2SiO3.9H2O as raw materials, water/EG as a solvent, nitric acid or a sodium hydroxide solution as an agent for adjusting a pH value and a Ti plate as a negative pole. The preparation method has the advantages of usage of cheap and easily available raw materials, no need for high temperature and high pressure, mild and controllable reaction conditions, easy operation, environment-friendly process, and no generation of harmful byproducts.

The invention belongs to the field of pharmaceutical preparations, and in particular relates to an in-situ temperature-sensitive gel drug delivery system for combined chemotherapy and immune therapy. The delivery system consists of drug carrier peptide dendrimers (G4‑arg), antineoplastic drugs and thermosensitive gel matrix material PLGA‑PEG‑PLGA, and the antineoplastic drugs are entrapped in the cavity of peptide dendrimers to form The drug-loaded peptide dendrimers wrap the drug-loaded peptide dendrimers in a temperature-sensitive gel matrix through the swelling process to form an in-situ drug delivery system that is an injectable sol at room temperature and turns into a gel at body temperature. The in situ delivery system of the present invention can form a gel near the tumor, slowly release the drug-loaded peptide dendrimer molecules to act on the tumor tissue, and the peptide dendrimer molecules act on the macrophages in the tumor tissue to generate NO , together with anti-tumor drugs to act on tumors, forming a chemotherapy-immune combination therapy to inhibit the development of tumors.