3results about How to "Overcoming associativity" patented technology

This invention discloses a piezoelectric self-renewing gradient ceramic catalytic membrane and its preparation method, belonging to the field of porous ceramic technology. The method includes the preparation of a porous piezoelectric ceramic substrate, LDH transition layer modification, and catalyst electrophoretic deposition. The catalyst electrophoretic deposition method involves dispersing the catalyst in a solvent, adjusting the suspension to make the catalyst particle surface positively charged, obtaining a catalyst suspension; using a ceramic substrate modified with a positively charged transition layer as the cathode and a graphite rod as the anode, immersing both electrodes in the catalyst suspension, controlling the distance between the two electrodes to 1.4-1.6 cm, connecting a constant voltage DC power supply of 20-40V, and depositing for 5-15 minutes. After deposition, the sample is removed and subjected to post-processing and polarization treatment to obtain the catalytic ceramic membrane product. This invention utilizes fluid pressure fluctuations to excite the piezoelectric effect, achieving in-situ mechanical exfoliation and self-renewal of catalytically activated and surface-deactivated catalysts, significantly improving catalytic efficiency and long-term stability.

The invention relates to a high-impact-resistance polyurethane elastomer containing a cyclodextrin metal organic framework structure and a preparation method of the high-impact-resistance polyurethane elastomer, and belongs to the technical field of elastomeric polymers. The invention provides a high-impact-resistance polyurethane elastomer containing a cyclodextrin metal organic framework structure, the high-impact-resistance polyurethane containing the cyclodextrin metal organic framework structure is novel polyurethane with high impact resistance, CD-MOF can be cross-linked with a macromolecular chain and form a regular and ordered structure with the macromolecular chain, microcrystals are formed, and the high-impact-resistance polyurethane elastomer containing the cyclodextrin metal organic framework structure is prepared. The mechanical property of the polyurethane is improved. When the polyurethane is subjected to external impact, microcrystals are damaged to absorb part of energy, so that the damage degree of molecular chains is weakened, and the impact resistance of the polyurethane is improved. The method is simple in step, an experimental formula can be changed according to production requirements, and industrial production can be carried out.

The application discloses a kind of composite tin paste for SEM chip and preparation method thereof, belong to composite tin paste technical field, including SnAgCu alloy spherical powder, spherical copper powder and soldering paste;Wherein, the particle size range of SnAgCu alloy spherical powder is 20~75 μm;The particle size range of the spherical copper powder is 1~60 μm;The mass percentage of the spherical copper powder in the total mass of alloy contained in the composite tin paste is 20%~70%;The soldering paste includes by mass percentage: rosin resin 40%~60%, organic acid activator 5%~15%, thixotropic agent 3%~8%, antioxidant 0.1%~5%, and the balance is organic solvent.The application adds the spherical copper powder with mass percentage 20%~70% and particle size range 1~60 μm in SnAgCu alloy spherical powder, substantially replaces expensive silver, significantly reduces the raw material cost of tin paste under the premise of guaranteeing or even improving welding performance, overcome the technical problems that the cost of existing SnAgCu tin paste is high due to high silver content.