10results about How to "Reduce migration rate" patented technology

The invention discloses a methane reforming catalyst capable of improving hydrothermal resistance as well as a preparation method and application of the methane reforming catalyst, and belongs to the technical field of catalyst preparation. According to the catalyst, a modified HAP-Ce composite carrier is prepared through coprecipitation, hydrothermal treatment and calcination, metal precursor salt serves as a modification component, Ni is impregnated and loaded, calcination is conducted, and then water vapor / nitrogen high-temperature hydrothermal treatment and hydrogen reduction are conducted to obtain the target catalyst. According to the catalyst, a heterogeneous metal oxide composite interface is constructed in situ, stable pinning of Ce species is achieved, and the Ni anchoring effect is enhanced, so that Ce migration and Ni sintering under the hydrothermal condition are inhibited, and high reaction activity, excellent carbon deposition resistance and good hydrothermal stability are shown; the preparation method has the advantages of controllable conditions and simple steps, and is easy for large-scale production and application.

This invention belongs to the field of engineered wood products manufacturing, specifically a method for preparing low-formaldehyde finger-jointed boards based on bio-based modified adhesives. The method includes preparing an adhesive composed of modified soybean protein, non-formaldehyde crosslinking agents, micro / nano cellulose, nano-silica, and epoxidized vegetable oil elastomers; pre-treating the wood and cutting the finger joints; applying a sealing liquid via atomization for end-face damping treatment; performing quantitative adhesive application and stepped butt joint molding; and employing a multi-stage hot-pressing process involving preheating penetration, high-temperature curing, and cooling and pressure holding. Through the above technical solution, this application can achieve the formation of a dense adhesive film at the finger joint interface, significantly improving bonding strength and stability while reducing formaldehyde release.

The invention is applicable to the technical field of electrochemical energy storage, and provides a mixed aqueous electrolyte containing long-chain fatty acid zinc salt and application thereof.The mixed aqueous electrolyte comprises a solvent and zinc salt, the solvent is a mixture of deionized water and a non-aqueous organic solvent, and the zinc salt comprises the long-chain fatty acid zinc salt and other zinc salt; the concentration of the long-chain fatty acid zinc salt is 0.5-2 mol / L, the concentration of the other zinc salt is 0-5 mol / L, and the structural formula of the long-chain fatty acid zinc salt is as follows: Zn (R-COO) 2; wherein R represents a hydrophobic long-carbon-chain organic group, and C is more than or equal to 6 and less than or equal to 30. Long-chain fatty acid zinc is introduced to serve as zinc salt to supplement the concentration of Zn < 2 + > and serve as an interface modifier due to the unique molecular structure (long hydrophobic carbon chain and hydrophilic carboxyl) of the long-chain fatty acid zinc.

The invention provides an oil leakage prevention structure and method based on dynamic sealing compensation, and the oil leakage prevention structure based on dynamic sealing compensation comprises a combination surface which adopts a composite sealing layer structure, and the composite sealing layer structure is provided with a base layer, a middle layer and a surface layer; and the intelligent bolt assembly is used for assembling the joint surface, the intelligent bolt assembly can monitor the pressure of the joint surface in real time and adjust the pre-tightening force through hydraulic pressure, and the problem of sealing of the lubricating oil pump of the aero-engine is solved.

The invention relates to the technical field of high polymer material auxiliaries, and discloses a low-VOC high-weather-resistance PCR-PP composite material and a preparation method thereof.The low-VOC high-weather-resistance PCR-PP composite material is prepared from, by weight, 5-15 parts of a main stable component containing a piperidine ring structure, 2-8 parts of aliphatic polyol with the hydroxyl value being 1600-1650 mgKOH / g, 10-30 parts of organic modified magnesium-aluminum hydrotalcite with the interlayer spacing larger than 2.6 nm, 5-15 parts of an auxiliary stable component containing a main stable component containing a main stable component containing a main stable component containing a main stable component containing a main stable component containing a main stable component containing a main stable component containing a main stable component containing a main stable Components are compounded through 110 deposition and 130 wetting, a hydrogen bond network coating layer with the thickness of 10-30 nm is formed in a 180-210 melting shear field, a physical pinning structure is constructed by means of intermolecular acting force among the components, diffusion activation energy of main stable components in a matrix is improved, migration loss is inhibited, and the bonding strength of the main stable components is improved. The alkaline active sites of the modified magnesium-aluminum hydrotalcite are used for in-situ neutralization of acidic oxidation intermediates generated by aging of regenerated polypropylene, so that an odor source is eliminated.

The invention discloses preparation and application of a hydrocarbon reforming hydrogen production catalyst for a direct reduction iron process. The catalyst contains 60-80% of a carrier, 10-15% of an active component I, 5-10% of an active component II, 1-5% of an anti-carbon additive, 3-10% of a structural additive and 1-3% of an electronic additive. The prepared catalyst has the advantages of high strength, high activity, carbon deposition resistance, excellent sintering resistance and high stability, the heat transfer function of the catalyst is improved due to the abundant pore structure, the surface temperature is reduced, and carbon deposition is reduced. The prepared catalyst is suitable for a CO2-supplementing reforming hydrogen production process of natural gas with a low water-carbon ratio in gas-based direct reduction iron, can be applied to an MIDREX process and a gas reduction process of an equal hydrogen-based shaft furnace, can be used under harsh conditions such as low-carbon hydrocarbon water vapor reforming and CO2 reforming hydrogen production, and is high in methane one-way conversion rate and CO2 one-way conversion rate.

The invention belongs to the technical field of semiconductors, and discloses a composite coating for a semiconductor device and a preparation method thereof.The preparation method comprises the following preparation steps that organic resin and a carburant are added into an alcohol solvent to be evenly mixed, and a resin solution is obtained; the method comprises the following steps: adding a tantalum source and a phase forming accelerant into an alcohol solvent, stirring and mixing to obtain a tantalum solution; the surface of the base body is coated with a resin solution and a tantalum solution, heating curing, carbonization and cooling are carried out, a composite coating containing glassy carbon and tantalum carbide is obtained, and the composite coating is of a single-layer structure or a double-layer structure; the single-layer structure is a composite single-layer coating containing glassy carbon and tantalum carbide; the double-layer structure is a double-layer coating structure comprising a glassy carbon layer and a glassy carbon and tantalum carbide composite layer from bottom to top from one side of the surface of the base body. The density of the composite coating prepared by the method can be effectively improved, so that the corrosion resistance of the composite coating in a plasma environment is improved.

The application relates to the technical field of concrete, and discloses a high-temperature-resistant and fire-resistant concrete and a preparation method thereof. The concrete is obtained by mixing dry materials, a hydroxyl-terminated polydimethylsiloxane pre-emulsion and an admixture aqueous solution; the admixture aqueous solution is obtained by mixing a polycarboxylic acid high-efficiency water reducing agent, a polyether modified organic silicon defoaming agent and water; the dry materials are obtained by mixing cement, fine aggregate and coarse aggregate; and the hydroxyl-terminated polydimethylsiloxane pre-emulsion is obtained by mixing a hydroxyl-terminated polydimethylsiloxane, a fatty alcohol polyoxyethylene ether and water. The application obtains good high-temperature-resistant and fire-resistant performance without sacrificing normal mechanical properties.

The application discloses a preparation method of heat-resistant resin and organic silver paste electronic paste, comprising the following steps: S1, preparation of heat-resistant modified carrier: mixing bismaleimide resin and phenolic epoxy resin, adding silane coupling agent, heating and stirring; then cooling, adding organic solvent and rheological additive, continuing to stir and vacuum defoaming to obtain the heat-resistant modified carrier, the heat-resistant resin system of bismaleimide and phenolic epoxy blending is adopted, the decomposition temperature is as high as 300 DEG C or above, the adhesion force decline rate of the silver layer to the substrate is less than 10% under long-term aging test at 200 DEG C, which is far superior to traditional epoxy silver paste.

The invention belongs to the technical field of composite material preparation, and particularly discloses a composite material and a preparation method and application thereof. The method comprises the following steps: preparing reed straw biochar BC; mgCl26H2O and AlCl3 are prepared into a metal salt solution, the metal salt solution and alkali liquor are dropwise added into a beaker at a constant speed at the same time, magnetic stirring is conducted, and suspension liquid is obtained; carrying out hydrothermal reaction, cooling to room temperature, discarding the supernatant, adding a DMF-absolute ethyl alcohol solution, and carrying out ultrasonic treatment, centrifugation, drying, grinding and sieving to obtain MgAl-LDH; the preparation method comprises the following steps: mixing BC and MgAl-LDH, adding deionized water, carrying out ultrasonic dispersion, carrying out a hydrothermal composite reaction, and after the reaction is finished, carrying out aging, centrifugation and drying to obtain the composite material. The composite material can realize directional adsorption and long-acting slow release of NO3 <->-N in farmland soil, improve the nitrogen fertilizer utilization rate and reduce nitrogen loss pollution.