6 results about "Reducing capacity" patented technology

The application relates to the technical field of organic synthesis, and discloses an organic sulfinate salt composition, a preparation method and application thereof and the composition. The preparation method comprises the following steps: contacting a monovalent organic sulfinate salt shown in formula I with a divalent metal salt or a salt of a metal with a valence higher than two under the condition that a poor solvent exists; the organic sulfinate salt prepared by the method has high yield and high purity, almost no sulfinate salt by-product is generated, the method has the advantages of simple operation, safe and easily-obtained reaction raw materials, rapid reaction, no need of recrystallization, the target product can be obtained through filtration after the reaction, less solvent is used, the cost is low, etc., the composition has the beneficial effects that the composition is more stable than a corresponding sodium salt, the sulfur odor is reduced, the composition has strong reducing capacity, etc.

The application belongs to the field of organic polymer synthesis and its application, and particularly relates to a low-valence manganese catalyst and its preparation and application in perfluoropolyether modified siloxane. The valence of manganese in the low-valence manganese catalyst is -1, and compared with zero-valence or +1 and +3 valence manganese, the reduction ability is stronger, the catalytic activity is higher, and the catalytic efficiency of the manganese catalyst is further improved. The fingerprint-resistant adhesive prepared by using the perfluoropolyether modified siloxane has excellent characteristics of hydrophobic and oleophobic, high transparency and good friction resistance. The preparation method is simple in operation, simple in process and convenient for industrial production. Meanwhile, the raw materials are cheap and easy to obtain, and the cost is low, so the application is conducive to popularization and application in production practice.

The present application provides a long-life low-friction grease composition and a preparation method thereof. The grease composition comprises the following raw materials by weight: 20-35 parts of high-alkaline calcium sulfonate, 50-65 parts of base oil, 2-6 parts of diisocyanate, 1-5 parts of p-toluidine, 0.5-2 parts of urea, 1-4 parts of conversion agent, 1-2 parts of calcium carbonate, 1-2 parts of calcium hydroxide, 1-4 parts of small-molecule acid, 3-5 parts of fatty acid, 0.5-2 parts of solid friction-reducing agent, 0.5-3 parts of antioxidant, 0.5-2 parts of surfactant, and 0.5-2 parts of passivator. The grease composition has excellent friction-reducing capacity and extreme pressure performance, and has a long service life.

The invention provides a method for preparing a supported nano noble metal by introducing a closed borane cluster into an MXene matrix, and belongs to the technical field of nano noble metal materials. A closed borane cluster is introduced into an MXene matrix to prepare a supported nano noble metal, the closed borane cluster (a weak reducing agent) with weak reducing capacity is pre-arranged on the surface of MXene in a solvent removal in-situ nucleation growth mode, then noble metal salt is introduced, in-situ reduction of the noble metal salt on the surface of MXene can be achieved, the noble metal salt is attached to the surface of MXene, and the supported nano noble metal is prepared. Controllable reduction of precious metal ions is achieved, and then the structure of the material is stabilized through high-temperature annealing treatment, so that the load type nanometer precious metal material with the small size and the high dispersity is obtained.

The invention provides a morphology-controllable method for preparing silver-coated copper powder. The morphology-controllable method comprises the following steps: S1, dispersing copper powder in water to obtain a copper powder suspension; s2, a plurality of parts of silver nitrate are dissolved in water, different complexing agents are added, and a plurality of parts of different silver complexing solutions are obtained; s3, respectively dissolving different reducing agents in water to obtain a plurality of parts of different reducing agent solutions; s4, in a stirring state, simultaneously dropwise adding a first silver complexing solution and a first reducing agent solution into the copper powder turbid liquid, then simultaneously dropwise adding a second silver complexing solution and a second reducing agent solution, sequentially and continuously dropwise adding until an Nth silver complexing solution and an Nth reducing agent solution are completely dropwise added, and continuously stirring and reacting; and S5, carrying out solid-liquid separation, and cleaning and drying the solid to obtain the silver-coated copper powder. According to the method, the silver deposition rate is regulated and controlled by matching complexing agents and reducing agents with different complexing capacities and reducing capacities, so that the silver-coated copper powder with different morphologies such as rough surfaces or smooth and compact surfaces can be controllably prepared.

The invention discloses a green modification preparation method of AX with high viscosity and antioxidant activity, which comprises the following steps: adding EDC and NHS into an AX solution for esterification reaction, then adding cysteine for grafting, dialyzing and freeze-drying to obtain modified AX. According to the invention, Cys is successfully grafted to carboxyl of a side chain of AX through amidation reaction, so that thiolation modification of AX is successfully completed. Only 15.71%-18.75% of sulfydryl in the TAX subjected to thiolation modification is oxidized to generate a disulfide bond, and the biological activity of the sulfydryl is well reserved. Sulfydryl introduced through thiolation modification endows TAX with excellent oxidation resistance and adhesion property, and compared with TAX before modification, DPPH (1, 1-diphenyl-2-picrylhydrazyl) and ABTS (2, 2 '-azinobis (2, 3-azinobis (3, 4-azinobis (3, 4-azinobis (3, 4-azinobis (3, 4-azinobis (3,