7 results about "Sodium thiocyanate" patented technology

The present application belongs to the technical field of adsorbents, and relates to a kind of for adsorbing and settling palladium amidoxime polyacrylonitrile-based microspheres and preparation method thereof.The present application utilizes chitosan quaternary ammonium salt (Q-CS), polyacrylonitrile (PAN) and sodium thiocyanate-containing amidoxime polyacrylonitrile (PAO / NaSCN) to obtain palladium adsorption performance stable amidoxime polyacrylonitrile microspheres;Among them, amidoxime and functional groups such as hydroxyl, amino and the like in chitosan can play the role of palladium adsorption, thiocyanate in sodium thiocyanate plays the role of settlement, and polyacrylonitrile enhances the mechanical strength of microspheres.The microspheres can adsorb and settle nearly 76% of palladium ions in solution within 5min at room temperature, reach adsorption and settlement equilibrium after 600min, and the adsorption capacity can reach 242mg / g when adsorption and settlement reach saturation.

This invention relates to the field of oilfield chemical technology, and discloses a low-molecular-weight, high-viscosity ternary polymer flooding agent, its preparation process, and its application. The low-molecular-weight, high-viscosity ternary polymer flooding agent comprises the following raw materials by weight: simulated formation water: 986.2-995.9 g; sodium thiocyanate: 0.2-1.2 g; partially hydrolyzed polyacrylamide: 1.0-3.0 g; dodecyl hydroxypropyl sulfobetaine: 2.0-6.0 g; sodium salicylate: 0.9-3.6 g. The simulated formation water is prepared from deionized water, sodium chloride, calcium chloride, and magnesium chloride. Sodium thiocyanate is added to the simulated formation water to obtain a basic conditioning fluid; partially hydrolyzed polyacrylamide is added to obtain a polymer-based fluid; dodecyl hydroxypropyl sulfobetaine is added to obtain a mixed solution; and sodium salicylate is added to induce a rheological property transformation. This invention constructs a double interpenetrating network structure, solving the problems of insufficient viscosity enhancement and poor plugging.

The application provides a combination catalyst and application thereof, and belongs to the technical field of fine chemical industry.The combination catalyst is composed of a phase transfer catalyst, an antioxidant and a buffer agent; the phase transfer catalyst is a crown ether phase transfer catalyst; the antioxidant is one or more of dilauryl thiodipropionate, dioctadecyl thiodipropionate, triphenyl phosphite and pentaerythritol diphosphite; and the buffer agent is one or more of potassium carbonate, sodium hydroxide and sodium bicarbonate.The combination catalyst has high activity, and when used in the reaction of synthesizing sodium thiocyanate and chloropropyl triethoxysilane, the combination catalyst has mild conditions, small dosage, easy control, simple operation, short reaction time, high yield, few by-products, reduced production cost, and improved product yield and quality.

This invention discloses a nanocomposite phase change antifreeze water-reducing agent and its preparation method, comprising water and the following components in parts by weight: 5-8 parts polycarboxylate superplasticizer mother liquor, 6-10 parts ethylene glycol, 8-10 parts calcium formate, 2-4 parts sodium nitrite, 5-8 parts methanol, 2-5 parts sodium metasilicate, 1-2 parts sodium thiocyanate, 0.3-0.6 parts air-entraining agent, 6-8 parts modified nano titanium dioxide, and 8-10 parts ternary phase change material. This nanocomposite phase change antifreeze water-reducing agent is a composite functional admixture that introduces nanomaterials and phase change materials into traditional antifreeze water-reducing agents. It not only prevents concrete from freezing at low temperatures but also regulates the internal temperature changes of concrete through "phase change" characteristics, thereby improving the durability of concrete under freeze-thaw cycles.

This invention relates to a method for preparing 2-nitro-5-cyanothiobenzoic acid, comprising: (1) dissolving 5-amino-2-nitrobenzoic acid and an acid in a first reaction solvent, water, adding a nitrosating agent dropwise to the reaction system, reacting at a temperature of -20 to 20°C for 1 to 12 h, to obtain intermediate 3-carboxy-4-nitrobenzene diazonate M; the first reaction solvent is one or a mixture of water, acetonitrile, and ethanol; (2) reacting the intermediate 3-carboxy-4-nitrobenzene diazonate M obtained in step (1) with a thiocyanating agent and a catalyst in a second reaction solvent to undergo a nucleophilic substitution reaction, reacting at a temperature of -20 to 30°C for 1 to 24 h, to obtain 2-nitro-5-cyanothiobenzoic acid; the thiocyanating agent is selected from one or a mixture of cuprous thiocyanate, sodium thiocyanate, or potassium thiocyanate; the second reaction solvent is one or a mixture of water, acetonitrile, and ethanol. The raw materials of this invention are readily available, the cost is controllable, the reaction is mild, it is green and environmentally friendly, and it has high selectivity and high yield.

This invention discloses the application of sodium thiocyanate in the preparation of a kit for coagulation assays. The kit detects coagulation parameters based on coagulation methods, chromogenic substrate methods, or immunoturbidimetric assays. These coagulation parameters include prothrombin time, activated partial thromboplastin time, thrombin time, fibrinogen, fibrin(ogen) degradation products, D-dimer, antithrombin III, and anti-Xa. By adding sodium thiocyanate to the coagulation assay kit, this invention optimizes the clinical relevance of the assay kit by adjusting reaction time (coagulation method), improving the linear range (chromogenic substrate method), and enhancing the differentiation between low and high values ​​(immunoturbidimetric assay), thereby improving the accuracy of the test.

The application relates to a light emitting diode, in particular to a quantum dot light emitting diode, a preparation method and a light emitting device, which provides a prefabricated quantum dot solution, the prefabricated quantum dot solution comprises quantum dot main materials and long-chain ligands, the prefabricated quantum dot solution is mixed with an ethanol solution of sodium thiocyanate, and stirring is carried out at 70 DEG C-100 DEG C for 20 min-60 min, post-treatment is carried out, and a ligand quantum dot solution is formed; the ligand quantum dot solution is spin-coated on a hole transport layer, and first annealing treatment is carried out, so that a preliminary quantum dot layer is formed; an ethanol solution of zinc iodide is spin-coated on the preliminary quantum dot layer, is placed, is rinsed, and second annealing treatment is carried out, so that a quantum dot light emitting layer is formed; and an electron transport layer and a cathode are sequentially formed on the quantum dot light emitting layer. Through the method of liquid-solid ligand exchange and passivation of quantum dots, the light emitting efficiency and brightness of the device are effectively improved, and the stability of the device is improved.