31results about How to "Inhibition of water absorption" patented technology

The purpose of the present invention is to provide: a carbonaceous material for negative electrodes of nonaqueous electrolyte secondary batteries, which uses a plant-derived organic material as a starting material, and from which alkali metals such as potassium element and alkaline earth metals such as calcium element are sufficiently removed by decalcification, so that the carbonaceous material has high purity and excellent discharge capacity and efficiency; a novel production method which is capable of efficiently mass-producing the carbonaceous material; and a lithium ion secondary battery which uses the carbonaceous material. The above-mentioned purpose can be achieved by a carbonaceous material for negative electrodes of nonaqueous electrolyte secondary batteries, which is obtained by carbonizing a plant-derived organic material, and which has an atomic ratio of hydrogen atoms to carbon atoms (H / C) as determined by elemental analysis of 0.1 or less, an average particle diameter (Dv50) of 2-50 mum, an average interplanar spacing of the (002) plane as determined by a powder X-ray diffraction method of 0.365-0.400 nm, a potassium element content of 0.5% by mass or less and a calcium element content of 0.02% by mass or less.

In a collapsible mold and a method of manufacturing the same, the collapsible mold has extremely low moisture-absorption properties, does not change in surface properties thereof due to absorption of moisture and swelling, and is storable for a long time without absorbing moisture and swelling. Specifically, the method manufactures a collapsible mold containing at least any of calcium oxide and magnesium oxide. The method includes a step of bringing the collapsible mold into contact with carbon dioxide immediately after a step of burning the collapsible mold or a step of casting the collapsible mold.

Provided are: a cellulose fiber-dispersed polyolefin resin composite material obtained by dispersing cellulose fibers in a polyolefin resin which contains a polypropylene resin, wherein the proportionof cellulose fibers constitutes 1-70 parts by mass, inclusive, of the 100 parts by mass which is the total mass of the polyolefin resin and the cellulose fibers, and the water absorption rate satisfies the subsequent formula; a pellet and molded article which use the composite material; and a method for producing the composite material. Formula: (water absorption rate)<(cellulose effective mass ratio)2*0.01

The invention relates to the field of building construction, in particular to a waterproof building exterior wall thermal insulation structure and a construction method thereof, comprising an exterior wall body, the surface of the exterior wall body is sequentially provided with a leveling layer, a first bonding layer, thermal insulation layer, second adhesive layer, waterproof layer and protective layer. The invention solves the problem that in the prior art, due to the compressibility and high water absorption rate of rock wool, after it is prepared into a thermal insulation layer structure, the tensile strength is weak and it is easy to absorb a large amount of water to increase the weight of the thermal insulation layer, thereby causing thermal insulation The layer is separated from the wall, and the thermal insulation effect becomes poor.

The invention provides a desulfurized gypsum composition and a preparation method, a gypsum-based interior wall putty and application thereof, and relates to the technical field of architectural coatings. The desulfurized gypsum composition comprises the following components in terms of mass fraction: hemi-aqueous phase desulfurized gypsum 90 %-95%, anhydrous phase desulfurization gypsum 0.5%-3%, dihydrate phase desulfurization gypsum 0.5%-2%, and the balance is impurities. The desulfurized gypsum composition provided by the present invention is synergized with the hemi-aqueous phase desulfurized gypsum, the anhydrous phase desulfurized gypsum and the di-aqueous phase desulfurized gypsum in a specific mass ratio, which effectively improves the traditional gypsum material, which has strong water absorption and is easily deformed by moisture, causing gypsum to be deformed easily. The technical problem that the base interior wall putty cannot be used in a high humidity environment, when it encounters water, it can also effectively inhibit water absorption, reduce solubility, and improve water and moisture resistance, thereby effectively expanding the application range of gypsum materials.

The invention provides a method for manufacturing an environment-friendly household building material board by using yellow top chrysanthemum straws and birch shavings, and relates to the field of household building materials; the method comprises the following steps: (1) treating yellow top chrysanthemum straws with sodium hydroxide solution, taking out, draining, soaking in water vapor of 180-200 DEG C in acetic acid solution, pressurizing to 5-8 MPa, keeping the temperature and the pressure for 3 minutes, and then carrying out pressure relief blasting to obtain the yellow top chrysanthemumpowder body; (2) soaking the birch shavings in hydrogen peroxide solution at room temperature, and treating the birch shavings with steam at 160-180 DEG C for 5-20min to obtain birch fiber; (3) preparing an adhesive; (4) adding the yellow top chrysanthemum powder body and the birch fiber into a proper amount of deionized water to prepare paste, adding the paste into a mould, prepressing for 10-15sunder 1.5MPa to obtain prepressing plates, uniformly coating a layer of the adhesive between the two prepressing plates, prepressing for 10-20s under 2-5MPa, uniformly raising the temperature and pressurizing to 150-160 DEG C within 100s, 10-15MPa hot pressing for 200-250s, cooling to obtain a plate blank, finishing, curing and cutting to obtain a finished product. The method has the advantages of excellent performance, is green and environmentally friendly, and can be widely used in the market.

The invention discloses a surface-coated ternary positive electrode material and a preparation method thereof, belonging to the technical field of lithium ion battery positive electrode materials. The present invention includes molecular formula is LiNi x co 1‑x‑y mn y o 2 particles, the LiNi x co 1‑x‑y mn y o 2 The particle surface is covered with Li 2 MTiO 4 Nanoparticles, wherein M is at least one metal element in Ni, Co, and Mn. The present invention LiNi x co 1‑x‑y mn y o 2 The basic crystal phase structure of the battery is not destroyed, but a new phase of nanoparticles is coated on the surface to form surface protection, increase the interface stability between the surface of the positive electrode material and the electrolyte, and further improve the cycle retention rate of the material. Enhanced electrochemical performance. The surface alkalinity of the cathode material of the invention is reduced, the water absorption is suppressed, and the processing performance is improved.

The invention discloses a method for modifying a lithium titanate negative electrode material of a lithium ion battery. A titanium dioxide film is obtained by placing a pure titanium sheet in an acidic solution for immersion and calcining. The titanium dioxide film is immersed in a lithium source sol, and the preparation method is obtained after precalcination. Lithium titanate precursor thin film, with the lithium titanate precursor thin film as the substrate, the coating layer of ytterbium silicate is prepared on the surface of the substrate by plasma spraying-physical vapor deposition technology, and the lithium titanate thin film coated with ytterbium silicate is obtained after calcining Negative material. The lithium titanate thin film negative electrode material coated with ytterbium silicate obtained after the modification of the present invention can not only suppress the growth of lithium titanate particles, but also suppress the water absorption of the material, and can effectively maintain lithium titanate in the process of repeated charging and discharging. The structure is stable, and the rate, cycle and chemical stability of lithium titanate are improved.

The invention provides a manufacturing method of a semiconductor planarization layer. The manufacturing method comprises the following steps: a coating, baking and drying step, that is, a photoresist for forming a planarization layer is coated on a lower layer film and then the baking treatment and drying treatment are performed; an exposure and development step, that is, the exposure treatment and the development treatment are performed on the planarization layer after the coating, baking and drying step; the manufacturing method is characterized in that the coating, baking and drying step is carried out in at least twice according to the required coating thickness of the planarization layer to be manufactured; the exposure and development step is carried out for at least once. The manufacturing method can improve the taper angle of the planarization layer, reduce the undercut phenomenon of the planarization layer, and prevent the breakage of an upper layer film of the planarization layer, so as to improve the reliability of products.

A method for preparing a lithium titanate anode material coated with a composite is disclosed. The lithium titanate anode material is coated with the composite that is Zn2Te3O8.xTiTe3O8 (with the x being 0-1). The method includes preparing a pure-phase lithium titanate precursor by adopting a sol-gel process, subjecting the precursor and a Zn2Te3O8.xTiTe3O8 mixture in a certain ratio to solid-phase grinding, and performing calcination in an air atmosphere to obtain the lithium titanate anode material coated with the composite that is the Zn2Te3O8.xTiTe3O8. In the anode material, the lithium titanate is evenly coated with the Zn2Te3O8.xTiTe3O8, and therefore growth of lithium titanate particles is inhibited, the pH value of the anode material is reduced, and a Zn2Te3O8.xTiTe3O8 surface coating is good in chemical stability, structure stability of the lithium titanate is effectively maintained in repeated charging and discharging processes, and the rate and cyclic performance of the lithium titanate are increased. In addition, a whole preparing process is simple and easy to test. The method has a wide application prospect.

The invention discloses a preparation method of hydroxyapatite-coated lithium titanate. The method comprises the following steps: respectively preparing a lithium source solution of a certain concentration and a titanium source solution of a certain concentration; adding the lithium source solution and the titanium source solution to sol with a certain ratio of hydroxyapatite, and carrying out water bath and magnetic stirring to form gel; drying the gel to prepare a precursor; and grinding, crushing and calcining the precursor to obtain a hydroxyapatite-coated lithium titanate anode material. According to the preparation method of the hydroxyapatite-coated lithium titanate, the hydroxyapatite can effectively coat the surface of the lithium titanate, inhibits growth of particles, and shows relatively high electrochemical activity. The pH value of the material can be lowered; and the hygroscopic property of the material is inhibited. According to the preparation method, the required raw materials are low in price; the operation is simple and feasible; and the prepared lithium titanate anode material has excellent electrochemical properties.

The invention discloses a doped lithium nickel manganate material having the chemical composition of LiMn<1.5-x>Ni<0.5-x>Y<2x>O<4>. The invention discloses a modified lithium nickel manganate positiveelectrode material. The invention also discloses a preparation method the doped lithium nickel manganate material and a preparation of the modified lithium nickel manganate positive electrode material. A sol-gel method is adopted to prepare the doped lithium nickel manganate material with uniform grain diameter; the surface of the doped lithium nickel manganate material is uniformly coated with Li<2>SnO<3> to obtain the modified lithium nickel manganate positive electrode material which has high structural stability, cycle performance and thermal stability; and the preparation methods are simple in operation.