140results about How to "Low hydroxyl content" patented technology

The invention discloses electrolyte for a lithium titanate battery. The electrolyte comprises a solvent, a solute and an additive, wherein the additive contains cyclic phosphate with the structural formula (1), (2), (3) or (4), R represents for a hydrocarbyl group of C1 to C6, a ketone group of C2 to C6, an ether group of C2 to C6 or a halogen element, and R' represents for a saturated hydrocarbyl group of the C2 to te C6 or unsaturated hydrocarbyl group of the C2 to the C6. In addition, the invention also discloses a lithium titanate battery.

The invention relates to a preparation method for fluorine-containing low-refractivity Yb<3+>-doped quartz glass. The method comprises the steps: starting from a solution, preparing evenly doped silicon oxide powder by using a sol-gel method; and carrying out decarbonization and dehydroxylation treatment on the powder, and finally sintering into glass. By applying the method, F<-> can be effectively introduced, and the rare earth-doped quartz glass with high uniformity, low hydroxyl content and the refractivity almost identical to that of the pure quartz glass can be obtained. The method can be applied to preparation of a high-brightness large-mode-field quartz optical fiber mandril.

The invention discloses a preparation method of a Yb3+ doped silica fiber preform mandrel. The preparation method comprises the steps that silicon oxide powder doped with rare earth and co-doping agent Al, P and the like is prepared; decarbonization, dehydroxylation and ball-milling treatment are carried out; high-temperature purification is carried out; the purified powder biscuit is smelted at a high temperature to form glass, and the glass is prepared into the mandrel. The Yb3+ doped silica fiber preform mandrel with the diameter range of 3-18 mm and the length range of 50-300 mm can be prepared, the doping evenness of the mandrel is quite good, and the refractive index fluctuation of the mandrel delta n is smaller than 2*10<-4>. Correspondingly, the mandrel and a pure silica glass sleeving bar are adopted, the preform is prepared through a pipe-bar method, after optical fiber is formed through drawing, the refractive index evenness delta n of the optical fiber exceeds the detection limit of an instrument, and the back bottom loss of the optical fiber at the 1200 nm position is lowered from 0.5-1 dB to 0.05 dB/m and reaches the loss level of MCVD technology.

The invention provides a preparation method for phenolic resin, which comprises the following steps: carrying out reaction on phenol, formaldehyde and organic compound containing amino and organic phosphorus compound under the condition of a basic catalyst to obtain the phenolic resin, wherein the organic phosphorus compound contains phosphorous and oxygen double bond, phosphorous and oxygen bond or hydroxyl. In the invention, the organic compound containing amino and the organic phosphorus compound are taken as modifiers to modify the phenolic resin; and nitrogenous groups and phosphoric groups are directly introduced in the structure of the phenolic resin and have the synergism inflaming retarding function so as to obtain the phenolic resin with excellent fire resistance. At the same time, the organic compound containing amino and the organic phosphorus compound enable the hydroxy content of the phenolic resin to be reduced and enable the hygroscopicity resistance of the phenolic resin to be improved.

The invention relates to paper-tube adhesive and a preparation method thereof, which belongs to the technical field of adhesive. The paper-tube adhesive is prepared by mixing emulsion, oxidized lignin, potassium persulfate, ethylene glycol, kaolin powder, aluminum phosphate and water, heating, stirring to facilitate the reaction, cooling to room temperature, continuously stirring, and loading. The emulsion is prepared by heating and mixing water and polyvinyl alcohol, then cooling, adding emulsifier, plasticizer, defoaming agent and the like, continuously adding an initiator, heating, and stirring to facilitate the reaction; and the oxidized lignin is prepared by filtering papermaking black solution, heating and stirring filtrate and a sulfuric acid solution to facilitate the reaction, filtering, mixing filter residues and a sodium hydroxide solution, adding sodium periodate and methyltrioxorhenium, stirring to facilitate the reaction, finally standing, filtering and washing. The paper-tube adhesive is good in water resistance and capable of meeting the production requirement.

The invention discloses an organosilicon composite material and a preparation method thereof. The composite material is prepared from alkylene-containing polysiloxane, hydrogen-containing polysiloxane, epoxide group polysiloxane, a heat-conduction filling material, a hydrosilation catalyst, a reaction inhibitor and the like through mixing and curing. The prepared organosilicon composite material has the characteristics of low content of volatile compounds, resistance to high and low temperature, high heat conduction, light weight, high strength, good cementability, electrical insulating properties, etc., can meet development demands of functional assemblies for large power, microminiaturization, lightweight and high reliability, and is applicable as a badly-needed high-performance heat-conducting insulating material in military fields like aviation, spaceflight and weapons and in fields related to people's livelihood, e.g., an LED illumination system and an electronic circuit integration system.

The invention is a method for producing a low-hydroxyl quartz glass tube, characterized in that it selects 60-220 mesh high-purity quartz powder containing SiO2 >=99.90%, and impurities less than 30ppm, and dopes colorizing agent in 0.1-1.0% of the weight of the high-purity quartz powder, where the colorizing agent selects at least one of the copper nitrate, magnesia and cerium oxide, mixed uniformly and dried; it adds the processed raw materials into a continuous melting quartz furnace and melts them, opens the gas outlet at the furnace mouth and discharges gas impurities, feeding the melted raw materials into a drawer for making tube drawing forming and draws them into wine quartz glass tubes; feeds the wine quartz glass tubes into a de-hydroxylation furnace for de- hydroxylation and obtaining the finished products-red quartz glass tubes. The hydroxyl content of the red quartz glass tubes is generally lower than 1ppm and the products have good quality, and can be applied to special industries; and the process of the invention can implement continuous quartz glass tube production, having high productivity.

The invention relates to a method for producing low water peak fiber by improved chemical gas phase deposition (MCVD) method, wherein the single-mode optical fiber has an attenuation coefficient <0.320 dB/km at the position of 1310nm, the monohydric peak attenuation coefficient is less than 0.310dB/km.

The invention relates to a low hydroxyl content white carbon black and a preparation method of the low hydroxyl content white carbon black. The preparation method comprises the following steps: 1) preparing a reaction base solution with the pH of 7.0-10.5 at the temperature of 65-99 DEG C; 2) adding concentrated sulfuric acid and a sodium silicate solution to conduct a precipitation reaction, wherein the temperature of the precipitation reaction and the temperature of the reaction base solution are the same, keeping the pH of a system to 7.0-10.5 constant; 3) regulating the pH and post-processing to obtain the white carbon black. The white carbon black is low in hydroxyl content, the density of hydroxyl is less than 3/nm<2>, the white carbon black is excellent in dispersity, the white carbon black is taken as a reinforcing agent to prepare a rubber, the excellent reinforcing effect is shown, the vulcanizing rate is increased, the vulcanizing time of the rubber material is shortened, and the processing performances and the mechanical property of a rubber compound are improved.

The invention relates to an adhesive used for a high-heat resistance leadless low-dielectric copper-clad plate and a preparation method thereof. The adhesive comprises the following components in parts by weight: 15-70 parts of low dielectric epoxy resin, 15-40 parts of modified polymerized acid anhydride, 5-40 parts of a cyanate esters curing agent, 2-40 parts of an active esters curing agent, 10-50 parts of a bromine-containing fire retardant, 0.05-1.000 parts of silane, 0.001-0.1 parts of a metals curing accelerator, 0.001-0.1 parts of an amines promoter, 0.005-0.1 parts of an imidazoles promoter, 10-60 parts of an inorganic filling material, and 1-8 parts of a flexibilizer. Compared with the prior art, the copper-clad plate has the advantages of high heat resistance, low water absorption, low dielectric loss and excellent resistance to heat and humidity.

The invention relates to a method for preparing ordered media-hole molecular screen with high hydro-thermal stability, which belongs to the technical field of inorganic chemistry and catalysis chemistry. And the processing contains preparing template agent and raw powder and removing template agent. During the template agent preparation, the mixture of small molecular quaternary ammonium salt and the carbon and hydrogen surface active agent is used as the template agent and the template agent solution is adjusted to PH<1 with HCl. During the raw powder preparation process, silica source is added in the template agent solution, stirred to produce sol and hydro-thermal crystallization for 24-120 hours at the temperature 100-220 degree which can be carried out in two steps. And during the template agent removal process, the raw powder is calcined in 400-700 degree. The invention uses the small molecular quaternary ammonium salt instead of F/C surface active agent as the mixed template agent, which avoids the toxicity of F-contained surface active agent and produces ordered media-hole molecular screen. The product has good hydro-thermal stability because the silica-contained substances in the skeleton of the product are highly condensed.

The invention relates to a preparation method of an organosilicone product, more specifically to a preparation method of dimethicone with low hydroxyl content and application thereof. The method comprises the following steps: adding methylsiloxane, hexamethylsiloxane and an acid catalyst into a reaction kettle, stirring and heating to 70-75 DEG C under vacuum condition to carry out a reaction; standing for layering after the reaction, and releasing the reacted acid catalyst from the bottom valve of the reaction kettle; adding 15% of a sodium carbonate aqueous solution into the reaction kettle and stirring, and adjusting pH to 7-8 to obtain a neutral upper-layer oil crude product; standing and removing water, removing low-boiling-point substances from the oil crude product, cooling and filtering so as to obtain dimethicone. The dimethicone prepared by the above method has high conversion rate and low hydroxyl content. The product quality is stable, and production efficiency is high.

The invention relates to the field of anticorrosive coatings, in particular to a solvent-free epoxy heavy-duty anticorrosive coating and a preparation method thereof. The solvent-free epoxy heavy-dutyanticorrosive coating comprises a component A and a component B; the component A comprises 100 parts of a solvent-free epoxy resin, 8-16 parts of a active diluent, 70-115 parts of a pigment and filler, 1.5-2.6 parts of a coupling agent, 1.5-2.6 parts of a dispersing agent, and 0.8-1.3 parts of a thixotropic agent; and the component B is a curing agent, and the mass ratio of the component B to theliquid epoxy resin in the component A is (1.5:1)-(3.5:1). The solid content of the heavy-duty anticorrosive coating is 98% or more, and the coating is an environment-friendly coating; the coating contains only a very small amount of a volatile organic solvent, so that only a small amount of shrinkage cavities and pinholes are formed after the coating is cured, and the compactness of the coating effectively increases the barrier properties and permeability resistance of an anticorrosive coating layer.

The invention relates to a preparation method of a quartz product, and especially relates to a preparation method of a low-hydroxyl large-diameter large-length quartz piece. According to the invention, the piece is prepared with a plasma vertical solid-phase external deposition method. One or a plurality of plasma torches can be configured. During a smelting process, the plasma torch is maintained unmoved, or is subjected to translational motions up and down on a vertical axis. The smelting temperature which is quartz piece surface temperature is 1800-2500 DEG C. Quartz sand is delivered in from a blanking pipe at a plasma torch upper port or by plasma device central airflow. A central base pipe or base rod is fixed on a glass machine tool, and simultaneously rotates when performing translational movements up or down on the vertical axis. Along with the relative movements of the plasma flame and the central base pipe or base rod, the quartz sand is deposed and molten layer by layer, such that a hollow quartz blank piece or a solid quartz blank piece is formed. With the plasma vertical solid-phase external deposition novel method, the prepared quartz piece has the characteristics high purity, low hydroxyl content, high softening point, high strength, high temperature resistance, and uniform diameter.

The invention provides a modified precipitated silicon dioxide and a preparation method for the modified precipitated silicon dioxide and relates to the technical field of silicon dioxide preparation.The preparation method for the modified precipitated silicon dioxide comprises the following steps: adding a cationic surface active agent into a sodium silicate solution and rising temperature, thereby acquiring a solution A; adding sodium sulfate into the solution A for precipitation reaction; using a sulfuric acid solution for regulating pH in the reaction process; ageing after the ending of reaction, thereby acquiring the modified precipitated silicon dioxide. According to the invention, the cationic surface active agent is added into the sodium silicate solution, positive charges are carried by the cationic surface active agent after dissolving in water, and then negative charges on the precipitated silicon dioxide surface interact with the positive charges on the surface of the cationic surface active agent, so that a cladding modification effect can be achieved, the stability and dispersity of the precipitated silicon dioxide grains can be promoted and the compatibility of themodified precipitated silicon dioxide and the rubber matrix can be obviously promoted.

The invention discloses modified lignin, a preparation method thereof and application of the modified lignin in a rubber composite material. Lignin and alkynyl compounds react in an organic solvent to obtain a reaction solution containing the modified lignin. The modified lignin has the following advantages: (1) the structure of the alkynylation reagent contains an acyl chloride functional group, and the acyl chloride functional group is easily subjected to esterification reaction with an alcoholic hydroxyl group and a phenolic hydroxyl group in lignin molecules to generate the modified lignin grafted with an unsaturated alkynyl functional group; (2) through alkynylation modification, the content of hydroxyl in lignin molecules is reduced, the molecular polarity is reduced, the self-aggregation tendency of lignin caused by hydrogen bonds is inhibited, lignin powder with relatively low particle size is obtained through grinding, the compatibility and affinity of lignin and non-polar natural rubber are improved, and the dispersion of the lignin in a natural rubber matrix is promoted.

The invention provides special two-component water-based paint for buses. The special two-component water-based paint comprises a two-component water-based epoxy primer, two-component water-based intermediate paint and two-component water-based finishing paint. While maintaining the original physical and chemical properties without reducing, compared with traditional solvent-based bus paint, the use of organic solvents can be significantly decreased, and VOC is lowered; compared with existing water-based bus paint on the market, the flash drying time can be shortened, the production pace is speeded up, and the more efficient coating efficiency can be obtained.