6results about How to "Reduce surface activity" patented technology

This invention discloses a high specific surface area mesoporous tin oxide powder and its preparation method. The method includes: dissolving a tin source in a mixed solvent of alcohol and deionized water, adding a ketone complexing agent and a nonionic dispersant, and stirring to form a tin-based complex precursor solution; then transferring the solution to a hydrothermal reactor for hydrothermal aging treatment, causing the precursor solution to hydrolyze and condense, forming gel particles in situ; after solid-liquid separation, washing with alternating anhydrous ethanol and dilute ammonia water, and drying to obtain the precursor powder; finally, performing staged heating calcination under an air-nitrogen mixed atmosphere, first removing organic components at low temperature, and then completing the crystal phase transformation at high temperature to obtain rutile phase SnO2 powder. The powder has an average particle size of 8–15 nm and a specific surface area of ​​85–110 m² / g. 2 The powder has a pergola size of 3–6 nm and good dispersibility. This invention effectively suppresses grain agglomeration through complexation regulation, hydrothermal-sol-gel coupling, and gradient atmosphere calcination. The prepared powder is suitable for applications such as gas sensors, lithium-ion battery anodes, or transparent conductive films.

The invention provides polyether modified fluorine-containing polysiloxane. The polyether modified fluorine-containing polysiloxane comprises a structure as shown in a formula (I). Compared with the prior art, the polyether modified fluorine-containing polysiloxane prepared from the fluorine-containing polysiloxane is used as the organosilicon slipping agent, can float on the surface of a paint film as a coating additive, and has very low surface activity due to very low surface energy of fluorine atoms in long-chain fluorine-containing side group silicone oil; therefore, the effect of reducing the surface tension of the coating can be achieved. Meanwhile, due to the introduction of trifluoropropyl, the lubricating property of the silicone oil can be greatly improved, the friction coefficient of a coating film to a second surface can be reduced, and the coating film is prevented from being scratched, so that the continuous chemical coating operability of the coating is improved.

The application relates to an ultrathin device and a preparation method and application thereof. The ultrathin device is prepared by the following steps: a mixture containing raw material powder, a binder and a solvent is granulated by a spray drying method to obtain a first precursor, the raw material powder comprises metal material powder and / or ceramic material powder, the surface area average particle size of the raw material powder is 1-15 mu m, the mass ratio of the raw material powder to the binder is 100:(1-10), the surface area average particle size of the first precursor is 40-80 mu m, and the fluidity of the first precursor is lower than 30 s / 50 g; the first precursor is subjected to a forming treatment to obtain a second precursor, the second precursor has a preset shape; and the second precursor is subjected to a heat treatment to obtain the ultrathin device, and the thickness of the ultrathin device is less than or equal to 1 mm.

This application discloses a method for preserving the aroma and optimizing the bubbles in prickly pear sparkling wine using mannoprotein. During the secondary fermentation stage of the prickly pear sparkling wine, mannoprotein is added to the fermentation system at an amount of 200-600 mg / L. This application addresses the problems of monotonous aroma and poor bubble quality in existing prickly pear sparkling wines.

The application discloses an EPDM sealing material for electronic water pump shaft seals and a preparation method thereof, and belongs to the technical field of rubber sealing materials. Double-bond modified hexagonal boron nitride and trifluoropropyltrimethoxysilane composite nanospheres are used as auxiliary reinforcing phases. The double-bond modified hexagonal boron nitride is a layered ceramic material with the characteristic of easy sliding. The trifluoropropyltrimethoxysilane composite nanospheres have a hollow structure and play a role similar to that of a ball bearing in the rubber matrix. The two can synergistically reduce the friction between the rubber molecular chains, so that the rubber molecular chains can more freely slide and deform under stress, can absorb stress at high and low temperatures, have good temperature impact resistance, and can adapt to the working requirements of electronic water pump shaft seals in cold northern regions.

The utility model relates to the technical field of neodymium iron boron permanent magnet materials, in particular to a neodymium iron boron powder surface passivation device. The device comprises a gas inlet mechanism, a main body mechanism and an exhaust mechanism which are sequentially communicated, the gas inlet mechanism comprises a nitrogen storage tank, a compressed air storage tank, a mixer, a pressure meter, an oxygen meter, a gas flowmeter and a thermometer, the pressure meter, the oxygen meter, the gas flowmeter and the thermometer are sequentially communicated, and the main body mechanism comprises a sample reaction bottle and a transmission mechanism used for driving the sample reaction bottle to turn over. Nitrogen and dry air are mixed to serve as a passivation gas source, the oxidation reaction rate of neodymium iron boron powder is controlled by flexibly controlling the conditions of oxygen content, temperature, pressure, gas flow and the like in the passivation process, a compact oxidation film is formed on the surface of the neodymium iron boron powder through slow oxidation reaction, the surface activity of powder particles is reduced, and the passivation effect is improved. And the powder is prevented from spontaneous combustion / explosion in the powder testing process under the open condition.