34results about How to "Key length" patented technology

The invention belongs to the technical field of material preparation and in particular relates to a preparation method of a WC-Co-cBN composite material. The preparation method of the WC-Co-cBN composite material comprises the following steps: firstly weighing WC, metal Co powder and cBN raw material in proportion, uniformly mixing, mixing by carrying out ball milling, drying the mixed raw materials in a drying oven at the temperature of 50-200 DEG C, then sieving with a sieve of 100-300 meshes, putting the dried raw materials into a mould, then placing the mould into a hot-pressing sintering furnace, heating the sintering furnace to 1200-1400 DEG C at a speed of 30-50 DEG C/min, insulating for 5-30 minutes, and maintaining pressure to be 20-50MPa, so that the WC-Co-cBN composite material is obtained. The preparation method of the WC-Co-cBN composite material has the advantages that the hot-pressing method is adopted, the sintering temperature is low, sintering time is short, and no phase transformation of cBN can be guaranteed while the WC-Co-cBN composite material has high shrinkage percentage and high volume density; meanwhile, hot pressing energy consumption is low, cost is low, operation is easy, and safety coefficient is high.

The invention discloses an oil-proof packaging paper and belongs to the field of paper products. The oil-proof packaging paper is prepared by mixing paper pulp, surfactant and complex oil-proof components at a speed of 400-500 r/min for 40-60 minutes and then standing to obtain a mixed solution, mixing coalescing agent, plasticizer and compound additives into the mixed solution to obtain a pulp solution, melt-extruding the pulp solution at 150-200 and then cooling down to obtain a packaging paper base, and then feeding the packaging paper base into a packaging paper production line. The oil-proof packaging paper solves the problems that existing oil-proof packaging paper are non-significant in oil-proof effects and prone to producing toxic substance when applied to high-temperature food.

The invention discloses a silicone rubber material with high corrosion resistance and a preparation method thereof, belonging to the field of rubber materials. According to the invention, modified silicone rubber and a thermoplastic polyurethane elastomer are added into an open mill for open milling; then a hydrolysis inhibitor and white carbon black are sequentially added for mixing and blanking; a rubber material is placed at room temperature, and then secondary mixing is performed; and the mixed rubber material is placed in a vulcanizing machine to complete vulcanization so as to obtain the high-corrosion-resistance silicone rubber material. According to the preparation method, the hydrophobic property and the stability of silicone rubber are improved by preparing the modified silicone rubber, and the hydrolysis inhibitor is prepared and is subjected to a ring-opening addition reaction with carboxyl groups, hydroxyl groups, amino groups and the like containing protons generated in the hydrolysis process of thermoplastic polyurethane elastomer, so the hydrolysis of the thermoplastic polyurethane elastomer is inhibited; and under the synergistic effect of the modified silicone rubber and the hydrolysis inhibitor, the silicone rubber-polyurethane composite material has excellent mechanical properties and excellent corrosion resistance.

The invention discloses an asymmetric dual-core cyclometalated platinum (II) complex with a D-A-A configuration pi conjugated system and an application thereof. In the metalated platinum (II) complex, pyrene(triphenylamine and the like)-pyridine-pyridine (D-A-A configuration) is used as a main ligand, 2,2,6,6-tetramethyl-3,5-heptadione is used as an auxiliary ligand, a dual-core coordination mode is adopted, and the middle A unit provides two coordination points; the metalated platinum (II) complex improves the external quantum efficiency by the means of enhancing the molecular rigid structure and molecular spin-orbit coupling effect, providing more triplet-state energy levels and improving the external quantum efficiency and the like, and has obvious advantages when used as a near-infrared organic electroluminescent materials; and the prepared near-infrared organic electroluminescent devices show remarkable photoelectric conversion efficiency.

The invention relates to the technical field of powder coatings, in particular to polyester resin for a powder coating with corrosion resistance, weather resistance and high storage performance, the powder coating and a coating. The polyester resin is prepared from, by weight, 90-125 parts of terephthalic acid, 22-30 parts of fluorine-containing dicarboxylic acid, 46-60 parts of isophthalic acid, 50-70 parts of neopentyl glycol, 10-14 parts of ethylene glycol, 18-24 parts of fluorine-containing dihydric alcohol; through reasonable matching of the components, the glass transition temperature of the polyester resin is improved, and the polyester resin has excellent corrosion resistance and weather resistance.

The invention provides a preparation method of a low-temperature-resistant anti-freezing agent for fruit trees and belongs to the field of plant anti-freezing agents. The anti-freezing agent is obtained by adding an aqueous solution to an oil solution and then performing emulsification under the action of an external magnetic field. The aqueous solution comprises a polysaccharide immobilized Fe3O4magnetic fluid, and a preparation method of the Fe3O4 magnetic fluid comprises the steps as follows: mixing a sodium hydroxide solution and a surfactant, introducing N2 for protection, increasing thetemperature to 45-60 DEG C, slowly adding a mixed salt solution of ferric chloride and ferrous sulfate and stirring the mixture for a reaction; washing an obtained product with deionized water to beneutral, performing centrifugal sedimentation, vacuum drying and grinding, and storing the anti-freezing agent for later use. The anti-freezing agent is safe, environmentally friendly, long in life and long in effective acting time, has remarkable benefits for cold resistance and freezing prevention of fruit trees and can promote growth of fruit trees and enhance immunity of fruit trees.

The invention discloses a rubber seal with good aging resistance, relates to the technical field of rubber seals, and is made of the following components: rubber base material, silicone oil, filler, crosslinking agent, lubricant, vulcanizing agent and plasticizer , carbon black, functional auxiliary agent; the functional auxiliary agent prepared by the present invention not only has a certain vulcanization accelerator function to the rubber seal system, but also can absorb the small molecule by-products generated in the vulcanization process of styrene-butadiene rubber. Its own specific functional groups participate in the anti-aging effect of styrene-butadiene rubber, which can improve the cross-linked structure of styrene-butadiene rubber to a greater extent and improve its mechanical properties; at the same time, it can improve the tensile strength and tear strength of rubber seals to a certain extent .

The invention discloses a preparation method of a nickel cobalt lithium manganate ternary positive electrode material, which comprises the following steps: preparing an aluminum-containing nickel cobalt manganese precursor, adding a compound of an element W and a compound of an element Ir, and sintering to obtain the nickel cobalt manganese positive electrode material containing aluminum, tungsten and iridium. By doping Al in the precursor synthesis process and doping W and Ir in the sintering process, the three doping elements are uniformly distributed in the material, the synergistic effect of the three doping elements enables positive electrode material particles to have higher hardness, and the higher particle hardness not only improves the compaction density of a positive electrode piece, but also improves the conductivity of the positive electrode piece. And the formation of microcracks in the particles in the circulation process can be effectively inhibited, so that the circulation performance of the material is improved. In addition, the process is simple, the production process is easy to control, and the method is suitable for large-scale production.

The invention discloses an anticorrosive acid and alkali resistant acrylic coating and a preparation method thereof. The acrylic coating is prepared from the following raw materials in parts by mass: 70 to 80 parts of butanol, 50 to 60 parts of butyl acetate, 20 to 30 parts of butyl acrylate, 20 to 30 parts of acrylic acid, 20 to 30 parts of hydroxyethyl acrylate, 20 to 30 parts of methyl methacrylate, 0.1 to 0.3 part of azodiisobutyronitrile, 0 to 14 parts of hexafluorobutyl methacrylate, 10 to 12 parts of epoxy resin, 10-12 parts by mass of a cross-linking agent and 0.1-0.4 part by mass of a catalyst. The acrylic coating is excellent in corrosion resistance, acid resistance and alkali resistance, simple and convenient in process, non-toxic and harmless, and excellent in economic value.

The invention relates to the technical field of slurry pumps, and discloses an integrated slurry pump and a manufacturing mold thereof. The integrated slurry pump comprises a volute and a pump shell, the pump shell is integrally formed and comprises a pump body, the diameter of one side of the pump body shrinks in the axis direction to form a suction inlet, and a connecting opening is formed in the other side of the pump body; and the volute can be embedded into the pump shell through the connecting opening, a sealed cavity is formed between the volute and the pump shell, and the sealed cavity is filled with a resin silicon carbide sand layer. The slurry pump has the following advantages and effects that the pump shell is integrally formed, splicing of two pump shells is not needed, the sealing performance is good, the volute can be embedded into the pump shell from the connecting opening in the pump shell, then the gap between the pump shell and the volute is filled with the resin silicon carbide sand layer, the volute and the pump shell are bonded, and the integrated slurry pump can be obtained.

The invention relates to a preparation method of self-cleaning fabrics, and belongs to the technical field of textile materials. According to the preparation method, titanium is used as a target material, a titanium dioxide film is sputtered on the surface of the base fabric as a substrate, polyvinylidene fluoride is used as a raw material, a nanofiber membrane is prepared by electrostatic spinning, and the nanofiber membrane is compounded on the surface of the substrate through hot pressing, so that the self-cleaning fabrics are prepared. According to a magnetron sputtering method, nano TiO2particles are deposited on the surfaces of the fabrics by utilizing an electromagnetic technique in a vacuum environment so as to form a nano TiO2 film, and the photocatalytic self-cleaning performance is given to the fabrics; anatase types generally react with H2O or OH- ions adsorbed to the surfaces so as to form hydroxyl radical with a strong oxidizing property; and electrons react with oxygenmolecules adsorbed to the surfaces, the oxygen molecules can participate in the reduction reaction and are used as the other source of surface hydroxyl groups, and all kinds of organic matter can be oxidized into micromolecules such as CO2 and H2O, so that the purpose of keeping the materials clean is achieved.

The invention relates to the technical field of chemical reaction photocatalysts, and discloses an Ag-C co-doped TiO2-perchloric acid pyranium salt photocatalyst and a preparation method thereof. TheAg-C co-doped TiO2-perchloric acid pyranium salt photocatalyst is prepared from the following formula materials: a benzaldehyde compound, a phenylacetaldehyde compound, phosphorus oxychloride and Ag-Cco-doped TiO2. According to the Ag-C co-doped TiO2-perchloric acid pyranium salt photocatalyst and the preparation method thereof, when perchloric acid pyranium salt absorbs solar energy, electrons can be absorbed to form an excited state, and high oxidation performance is achieved; C atoms replace O atoms in an interstitial void of TiO2 in the calcination process, a Ti-C bond and C-O bond with higher bond energy and shorter bond length can be formed, the growth of TiO2 grains can be inhibited to a certain extent, the TiO2 is enabled to have a larger specific surface area and active site, Ag+easily captures the electrons in a reaction system, and the negative charge generated is used in the reduction quenching process of the -perchloric acid pyranium salt biological catalysis process, the excited state of the perchloric acid pyranium salt can absorb the charge and reduce to a ground state, and the catalyst cycle process is achieved.

The invention discloses a stain-resistant and easy-to-clean yarn and a production process thereof, and relates to the technical field of textile yarns. An emulsifier and deionized water are used for shearing at a high speed, then glycidyl methacrylate, hydroxyethyl methacrylate, an anti-wrinkle monomer and a stain-resistant monomer are added for continuous shearing, emulsifying is performed to form a pre-emulsion, and an initiator is added into the pre-emulsion, so that the glycidyl methacrylate, the hydroxyethyl methacrylate, the anti-wrinkle monomer and the stain-resistant monomer are polymerized to form a polymer; after the polymer treats yarn, isocyanate is cross-linked with hydroxyl and amino on fiber to form a network-shaped polymer, so that the wrinkle resistance and the fuzzing and pilling performance of the yarn are improved, and the situation that dust is accumulated and difficultly cleaned is avoided; and a modifier is endowed with excellent hydrophobic and waterproof performance through a large number of existing C-F bonds, so that the yarn is prevented from being polluted by stains such as water, oil and dust, and the stain-resistant and self-cleaning effects of the yarn are greatly improved.

The invention belongs to the technical field of functional crystal materials, and particularly relates to a mid-infrared anti-radiation Er, Re: LuYSGG laser crystal and a preparation method and application thereof. The chemical formula of the laser crystal is Er3xRe3yLu3zY3 (1-x-y-z) Sc2Ga3O12, Re < 3 + > is a rare earth ion different from Er < 3 + >, Lu < 3 + >, Y < 3 + >, Sc < 3 + > and Ga < 3 + >, Er < 3 + >, Re < 3 + > and Lu < 3 + > all replace Y < 3 + > at the central position of a dodecahedron, partial substitution of Lu < 3 + > can improve the radiation resistance of the crystal, and a LuYSGG crystal grown by adopting a melt method is used as a laser host material of an active ion Er < 3 + > and can provide a proper crystal field for Er < 3 + >; the co-doped Re < 3 + > can realize a de-activation effect on an active ion Er < 3 + > so that the service life of a lower laser energy level 4I13/2 of the Er < 3 + > is effectively reduced, meanwhile, the service life of an upper laser energy level 4I11/2 is not obviously changed, thereby being beneficial to reducing a laser threshold value and improving laser efficiency.

The invention relates to a high-strength aluminum-plastic composite template and a preparation method thereof, and belongs to the technical field of building construction tools. The composite formwork comprises an aluminum angle bead and an aluminum support fixedly connected with the aluminum angle bead, the aluminum angle bead protects the tip of a modified PA plate, slurry leakage caused by knocking damage from the tip when the formwork is assembled and disassembled is avoided, the aluminum support has a bearing effect on the whole modified PA plate, a supporting ring in the middle provides a supporting site, stress is evenly dispersed, the situation that the formwork is pressed against and cracked by a supporting piece is avoided, and the service life of the modified PA plate is prolonged. A modified PA plate is poured on the inner side of the aluminum bracket; the modified PA plate is formed by polymerizing diacid containing benzene rings and diamine, a main chain contains a large number of benzene rings and has high rigidity, fluorine-containing groups are introduced into diacid polymerization monomers through hexafluoroisopropanol, fluorine atoms of side chains are spirally distributed along the main chain after polymerization, the main chain is tightly shielded, water absorption is reduced, and the service life of the modified PA plate is prolonged. The tolerance performance is improved, and the water absorption rate of the modified PA plate is about 0.2% through tests.