36results about How to "Good pore size uniformity" patented technology

The invention discloses a production method of a nano cellulose composite polystyrene multipolymer cation exchange resin. The method comprises the following steps: preparing a water phase and an oil phase, preparing composite resin microspheres and synthesizing the ion exchange resin, wherein the resin microsphere framework is prepared by crosslinking styrene, methyl methacrylate and vinyltrimethoxysilane. The polystyrene multipolymer cation exchange resin has the advantages of favorable high-temperature resistance, favorable chemical resistance stability, wide applicability, high mechanical strength, favorable pore size uniformity and high ion exchange capacity, especially has favorable adsorbability for heavy metal pollutants, and is suitable for treatment of heavy metal wastewater.

The invention relates to a preparation method of a microporous foamed polypropylene reflecting film. The preparation method comprises steps as follows: a polypropylene sheet material is placed in a device with specific infiltrating temperature and infiltrating pressure of specific supercritical fluid, temperature preservation and pressure maintaining are performed for specific time, then temperature preservation and pressure maintaining are performed for specific time at higher saturation temperature and under higher supercritical fluid saturation pressure, pressure is released at a specific pressure release rate, a microporous foamed polypropylene material can be obtained, and the microporous foamed polypropylene reflecting film is obtained through splitting. The method is suitable for industrial production and can be used for preparing the microporous foamed polypropylene reflecting film efficiently.

The invention relates to a chemical mechanical polishing pad and a preparation method thereof. According to the chemical mechanical polishing pad, polyurethane resin slurry is used and smeared on a film forming base material coated with a release agent, and different hole structures are coagulated on the two sides of a coagulated film in two steps in a two-section coagulation mode. In the process of condensation and pore forming, the concentration and temperature of two sections of condensation liquid are controlled, so that pores of two different pore structures are formed in the same condensation film at the same time, the diameter of finger-shaped pores which account for at least 15% of the total thickness of the condensation film from the surface layer to the inside is not larger than 25 microns, and the finger-shaped pores formed in the second layer side are high in pore diameter uniformity, small in pore diameter and large in abradable thickness; the service life of the polishing pad is prolonged; the sponge-shaped holes are formed in the side of the first layer, the thickness of the sponge-shaped holes accounts for one third or more than one third of the total thickness of the condensation film, the followability of a to-be-polished object is good, flexible support is provided, and the surface planarization degree of the to-be-polished object is improved.

The invention discloses a method for treating a polluted water body by a synchronous nitrification and denitrification biological carrier coupling system. A construction method of the synchronous nitrification and denitrification biological carrier coupling system comprises the following steps: 1) preparing a degradable cellulose carrier and biochar; 2) constructing a biological membrane device; 3) arranging the degradable cellulose carrier, the biochar and a conventional carrier in the biological membrane device, and adding functional bacteria to form the synchronous nitrification and denitrification biological carrier coupling system. The synchronous nitrification and denitrification biological carrier coupling system can quickly enrich functional microorganisms in a water body which is mainly polluted by ammonia nitrogen and nitrate nitrogen by utilizing the strong adsorption performance of a degradable cellulose carrier slow-release carbon source and biological carbon, so that an efficient denitrification effect is achieved.

The invention relates to a method of preparing a polypropylene microcellular foaming material by means of supercritical fluid technology. The method comprises the following steps of: putting a polypropylene material in a device with a special infiltration temperature and an infiltration pressure of a special supercritical fluid; keeping the temperature and pressure for a special time; then keepingthe temperature and the pressure for a special time at a relatively high saturation temperature and a relatively high supercritical fluid saturation pressure; and relieving the pressure at a specialpressure-relieving rate to obtain the polypropylene microcellular foaming material. The method is the method which is suitable for industrial production and prepares the polypropylene microcellular foaming material efficiently.

The invention discloses a textile fabric formaldehyde remover and preparation and application thereof. The textile fabric formaldehyde remover is composed of, by weight part, 8-14 parts of nano modified rectorite, 2-5 parts of 1-vinyl imidazole, 1-4 parts of acetoguanamine, 0.2-0.7 part of amidinourea phosphate, 1.2-1.8 parts of antibacterial agent, 0.5-2 parts of aromatics, 0.1-0.4 part of surfactant, 3-8 parts of polyvinyl alcohol and distilled water as balance. The textile fabric formaldehyde remover, which is prepared through reasonable formula and processes, is high in specific surface area and self-cleanliness, and compared with traditional absorbent agent of activated carbon, improves the porosity by more than 55% and prolongs the service life by more than 3 times. Meanwhile, the textile fabric formaldehyde remover obtains excellent anti-static, anti-bacteria, antifungal, radiation-proof and fabric-softening effects and achieves a formaldehyde removing rate within 20 minutes up to 99.2%, thereby being efficient and rapid.

The embodiment of the invention provides a semiconductor device and a manufacturing method thereof. A sacrificial layer can be deposited on a substrate, the sacrificial layer is etched by using a Bosch process to form a capacitance hole, the side wall of the capacitance hole is in concave-convex alternate change in the longitudinal direction, and a bottom electrode layer, a dielectric layer and a top electrode layer are sequentially formed in the capacitance hole. Due to the fact that the Bosch technology can enable etching to be carried out in the depth direction, formation of the capacitor hole with the high depth-to-width ratio is facilitated, uniformity of the hole diameter of the capacitor hole is improved, the side wall can be protected in the etching process, the concave-convex alternate change characteristic on the side wall is naturally formed in the etching process, doping in the deposition technology is not needed, the deposition technology is simplified, the capacitor area is increased, and a high-performance memory device is obtained on the premise of simplifying the process.

The invention discloses a production method for polystyrene multi-component copolymerization ion exchange resin for treating phenolic wastewater. The method comprises the specific steps that a water phase and an oil phase are prepared, composite resin microspheres are prepared, and ion exchange resin is synthesized, wherein a resin microsphere framework is formed by cross-linking of styrene, methyl methacrylate and vinyl trimethoxy silane. The polystyrene multi-component copolymerization ion exchange resin has good high-temperature resistance and chemical-resistance stability, and is wide in application range, high in mechanical strength, good in aperture uniformity, high in ion exchange capacity, especially good in adsorption to phenolic pollutants and suitable for treating phenolic wastewater.

The invention relates to paper-based filter material base paper for replacing mask melt-blown cloth and a preparation method of the paper-based filter material base paper. The paper-based filter material base paper for replacing the mask melt-blown cloth is characterized in that the physical properties are as follows: the quantification is 20-40 g/m<2>, and the tensile strength is 2 KN/m-4 KN/m; the wet strength is 15%-30%; the bulk is 1.3 to 1.8 m<3>/g; the average pore diameter is 30 [mu]m to 55 [mu]m; the respiratory resistance ranges from 30 Pa to 170 Pa; the surface potential after electret is 300 V-600 V, and the particulate matter filtering efficiency is 50%-80%. Plant fibers and polylactic acid fibers are used as filter materials for replacing polypropylene melt-blown cloth for thefirst time, and an anion fiber coating containing the nanofibers is sprayed to solve the problems that after plant fibers and polylactic acid fibers form paper, gaps are large, and the filter efficiency is low.

The invention belongs to the technical field of inorganic membrane materials, and particularly relates to a ceramic flat sheet membrane for perishable garbage sewage treatment and a preparation method thereof. The invention provides the ceramic flat sheet membrane for perishable garbage sewage treatment. The ceramic flat sheet membrane comprises an aluminum oxide ceramic flat sheet membrane support body, a separation membrane layer and a polymer membrane layer, wherein the outer surface of the ceramic flat sheet membrane support body is coated with the separation membrane layer; the support body comprises aluminum oxide powder, a binding agent, a dispersing agent and a pore forming agent; the separation membrane layer comprises aluminum oxide powder, styrene oxide modified calcite powder, a binding agent, a dispersing agent and a pore forming agent; and the polymer film layer is perfluoropolyether carboxylic acid cross-linked dehydroabietylamine. The ceramic flat sheet membrane is good in surface hydrophilicity, high in water flux, high in mechanical strength, good in filtering performance, excellent in anti-pollution performance and long in service life.