39results about How to "Uniform reaction rate" patented technology

The invention relates to the field of powder coatings, in particular to a polyester resin for a mixed thermal transfer powder coating and a preparation method thereof. The polyester resin for the mixed thermal transfer powder coating comprises the following components and contents: 1 mole percent of acids, 1.05-1.20 mole percent of alcohols, 10-15wt% of trimellitic anhydride and 0.1-1.0wt% of recomposed onium salts, wherein the alcohols accounting for the total alcohol mol percent comprise 10-90 mol% of neopentyl glycol, 0-45 mol% of dimethyl-1,3-propanediol, 0-20 mol% of ethanediol, 10-25 mol% of diethylene glycol; and the acids accounting for the total acid mol percent comprise 80-100 mol% of terephthalic acid, 0-10 mol% of m-phthalic acid and 0-10 mol% of mol% of adipic acid. The functionality of the polyester resin is regulated according to the amount of the branched components of the trimellitic anhydride, thus the obtained cured film has better surface appearance, low temperature (160 DEG C) curing is realized, the curing percent of film coating at low temperature is high, the curing film has fine solvent resistance and the transfer-printed transfer printing film is clear, vivid and easy to tear.

The invention provides a method for preparing a naphthalene series water reducer. The method comprises the following steps: sulfonation: carrying out a sulfonation reaction of naphthalene and concentrated sulfuric acid; hydrolysis: adding water into the sulfonation reaction product for hydrolysis, and hydrolyzing a by-product in the sulfonation reaction; condensation: adding poly formaldehyde and water into the hydrolysis reaction product for condensation; and neutralization: adjusting pH of the condensation reaction product to be 6-8, and drying to obtain the naphthalene series water reducer. The preparation method has the advantages of simple and stable production process and easily controlled parameters, and the prepared naphthalene series water reducer product has stable performance and good quality.

The invention discloses an alloy quantum dot core with uniform internal and external components and a preparation method thereof, wherein the method comprises the steps: stirring and mixing evenly at least two pre-prepared cationic precursor solutions, heating to a predetermined temperature, injecting at least one prepared anionic precursor solution, carrying out a nucleation reaction, continuing to inject the cationic precursor solutions or the anionic precursor solution or simultaneously inject the cationic precursor solutions and the anionic precursor solution at a gradually changed speed in the nucleation reaction process, making the reaction rate of all the components in the nucleation reaction process remained relatively stable and making the nucleation stoichiometric ratio relatively consistent, and thus obtaining the alloy quantum dot core with uniform internal and external components. By the method, the problems that an alloy quantum dot core has non-uniform internal and external components, low luminous efficiency and unstable wavelength and fluorescence intensity can be effectively solved, and the method provided by the invention has the advantages of simple operation, easy control, high repeatability and the like.

A fuel cell having a distributed fuel feed in which the heat generation profile can be better controlled. Fuel channel stack and system efficiency improvements are achieved.

The invention relates to a solar cell surface processing technology, in particular to an alkaline solution wet etching technique of the surface structure of a solar cell. The technology comprises the following two operation processes of thinning and making herbs into wool. The concrete operation steps of the process of making herbs into wool are as follows: deionized water is added in a water tank of a cleaning device and a heating power supply is turned on; well weighed alkaline solids are poured according to the stipulated solution proportion and stirred evenly; slow release agent isopropyl alcohol is added and stirred evenly after the temperature is increased to the specified temperature; a well thinned silicon wafer is added for reaction. Compared with the existing method, the method can greatly improve the labor production efficiency, reduce the environmental pollution and increase the controllability of production operation.

The invention discloses a preparation method of a polyaniline-polyacrylate compound, and relates to the technical field of polyaniline synthesis. The preparation method comprises the following steps: firstly, enabling part of active solvent to be reacted with part of mixed monomers and initiator, then, heating the reacted mixed system, next, dropwise adding the other part of mixed monomers, initiator and active solvent, and carrying out preserved heat reaction until the reaction is ended; cooling the system generated through the reaction to 0-20 DEG C, adding aniline, uniformly stirring, then, dropwise adding an oxidative initiator solution, and then, reacting at normal temperature until the reaction is ended. Polyaniline and polyacrylate resin in the polyaniline-polyacrylate compound disclosed by the invention are formed into a molecular compound to be added into an anticorrosive coating, so that not only is the uniform dispersion of polyaniline in the coating realized, but also polyacrylate resin in the compound can be used for promoting the compatibility of the polyaniline and film forming materials in an anticorrosive coating, so that the long-acting corrosion resistance and environment friendliness of polyaniline in a heavy anticorrosive coating can be realized.

The invention discloses a preparing method of rare earth iron-boron-based anisotropy magnetic powder and the prepared magnetic powder. The method comprises the steps that rare earth iron-boron alloy particles are subjected to HDDR processing, the rare earth iron-boron alloy particles obtained after HDDR processing is subjected to HDDR processing again, and accordingly the high-coercivity rare earth iron-boron-based anisotropy magnetic powder is obtained. The coercivity of the rare earth iron-boron-based anisotropy magnetic powder can be greatly improved, magnetic powder cost cannot be increased, and the residual magnetism and the maximum magnetic energy product of the magnetic powder cannot be lowered greatly.

The invention provides an additive for silicon wafer alkali liquor texturing, and belongs to the technical field of photovoltaics. The mass percent of each component is as follows: 0.5%-15% of a buffer component, 0.5%-10% of a dispersing component, 0.1%-8% of a suede adjusting component A, 0.01%-5% of a suede adjusting component B and the balance of water. The obtained texturing additive can be applied to diamond wire cutting single crystal alkali liquor texturing and can also be applied to diamond wire polycrystal alkali liquor rough texturing. Compared with traditional alcohol added components, the additive has the advantages of no toxicity, no volatilization, uniform reaction rate, no piebaldness and excellent foam control effect. The staying and separating time of bubbles on the surface of the silicon wafer can be controlled by adjusting the proportion of the suede adjusting components A and B, and the alkali suede making effect is enhanced. After the single crystal is applied, the silicon wafer has high photoelectric conversion rate. After the polycrystal is applied, the conversion efficiency can be improved by combining the existing black silicic acid texturing technology.

The invention belongs to the technical field of emulsion polymerization, and relates to a preparation method of carboxylic butadiene-acrylonitrile latex. A seed emulsion polymerization technology is adopted, and the preparation method comprises the steps of vacuumizing a polymerization kettle, adding deionized water, an emulsifier 1, an emulsifier 2, a seed emulsion and an initiator, carrying out gradient heating at the temperature of 25-60 DEG C, starting to dropwise add a mixture solution of acrylonitrile, butadiene, a carboxylic acid monomer and a molecular weight regulator for free radical emulsion polymerization for 6-9 hours, heating to 75 DEG C, keeping the temperature for 2 hours, cooling, adjusting the pH value of a reaction product to 6-8 by using an alkaline substance, and filtering to obtain carboxylic butadiene-acrylonitrile latex. Compared with the prior art, the carboxylic butadiene-acrylonitrile latex provided by the invention has excellent stability. The carboxylic butadiene-acrylonitrile latex is good in flowability, and is suitable for dipping gloves, medical examination gloves, thin (unlined) gloves and the like. The gradient heating process is adopted, the reaction condition is mild, the monomer is dropwise added, the temperature runaway phenomenon and the condensation product generation are effectively controlled, and the process is easy to control.

The invention relates to a low-water-absorption good-appearance flame-retarding polyamide composition and a preparation method thereof. The polyamide composition is prepared from, by weight, 45-65 parts of MXD6 and 35-55 parts of PA66 (the sum of weight parts of the MXD6 and PA66 is 100 parts), 15-45 parts of polyamide functional master batch, 20-70 parts of glass fibers, 5-15 parts of a flame retardant, 2-10 parts of a synergist, and 0.5-3 parts of a processing aid; wherein the polyamide functional master batch is composed of, by weight, 25-55 parts of PA66, 30-60 parts of polyketone, 10-30 parts of organic silicon, 2-6 parts of a nano-oxide, 1-5 parts of polyethylene glycol, 0.06-0.3 parts of toluene diisocynate, and 0.01-0.06 parts of dicumyl peroxide. The polyamide composition has excellent flame-retarding effect and mechanical performance, is low in water absorption, is free of floating fibers on the surface, is low in warping and is anti-scraping.

The present invention is aimed to realize, in a fuel cell with an oxygen electrode (a catalytic electrode), both catalytic function and immobilization of the catalyst nanoparticles when the catalyst nanoparticles are very small nanoparticles in the size of 1-3 nm.

Oxygen electrode used in the fuel cell according to the present invention is an oxygen electrode comprising a plurality of carbon particles, a carbon thin-film, and surface nanostructure, wherein the carbon particles are bonded to one another with the carbon thin-film 2, the surface nanostructure is formed on the surface of the carbon thin-film, the surface nanostructure comprises catalyst nanoparticles made of platinum (Pt) and carbon nanoparticles, diameter of each of the carbon particles is 30 nm or more and 100 nm or less, diameter of the catalyst nanoparticle is 1.7 nm or more and 3.1 nm or less, and diameter of the carbon nanoparticle is 1.0 nm or more and 11.2 nm or less. According to this combination of these elements, the catalyst nanoparticles are confined within three-dimensional structure to be formed by the carbon nanoparticles and are immobilized without losing space which allows any reactant to be accessed to the surface of the catalyst nanoparticles.

The invention discloses calcium carbide powder molding equipment. The calcium carbide powder molding equipment comprises a taper hopper, wherein two extrusion dies which are driven by power equipment to rotate in opposite directions and are extruded mutually are arranged below the taper hopper; an outlet in the lower end of the taper hopper directly faces the extruded parts of the two extrusion dies; a plurality of concave dies are arranged on the outer surfaces of the two extrusion dies; the two extrusion dies are both mounted in a protection casing provided with an inner cavity filled with nitrogen. The calcium carbide powder molding equipment can be used for safely preparing calcium carbide balls or calcium carbide blocks and inhibits flying of calcium carbide powder dust, the prepared calcium carbide balls or calcium carbide blocks are put into an acetylene production kettle for recycling, the reaction rate is uniform, the amount of gas evolution is high, and the economic benefit is increased.

The invention provides a redox flow cell, a redox flow cell stack and a redox flow cell system, wherein the redox flow cell comprises flow frames (1), collector plates (2), an ion exchange membrane and electrodes (3); each flow frame (1) is provided with a middle passage, a liquid inlet (11) and a liquid outlet (12), and the liquid inlet (11) and the liquid outlet (12) communicate with the middle passage; the collector plates (2) are arranged in the middle passages of the flow frames (1); the ion exchange membrane is arranged between the collector plates (2), and electrolyte-containing cavities are defined by the ion exchange membrane and the collector plates (2); and the electrodes (3) are arranged in the cavities, and are so arranged that the specific surface areas are gradually enlarged along the flowing direction of electrolyte from the liquid inlets (11) to the liquid outlets (12). The invention effectively solves the problem that the reaction rate and the reaction-produced heat at each part of the electrode are ununiform because the concentration of the reaction substances in the electrolyte is gradually decreased as reaction goes on, consequently, polarization is effectively reduced in the processes of charge and discharge, the charge-discharge performance of the cell is enhanced, and the service life of the cell is prolonged.

The invention relates to an aqueous high-modulus inorganic zinc-rich coating added with a catalyst and a preparation method thereof. The coating is prepared by mixing a lithium silicate solution, water, aluminum-modified silica sol, tetraethylammonium hydroxide, dodecyl glycol amide, a silane coupling agent, a silicone-acrylate emulsion and low-lead zinc powder. According to the aqueous high-modulus inorganic zinc-rich coating added with the catalyst, the tetraethylammonium hydroxide catalyst is added into the coating and is used for catalyzing reaction between the lithium silicate solution and the aluminum-modified silica sol, so that the uniformity of the colloid particles after reaction is improved.

The invention discloses calcium carbide powder forming equipment and a process for machining calcium carbide powder into calcium carbide balls or blocks. The equipment comprises a taper hopper. A pair of extrusion dies is disposed below the taper hopper. The extrusion dies are driven by power equipment to rotate along opposite directions and extrude each other. The lower-end outlet of the taper hopper faces directly to the extruding part of the two extrusion dies. A plurality of female dies are disposed on the outer surface of each extrusion die. The two extrusion dies are mounted in the cavity, filled with nitrogen, of a protective shell. Collected calcium carbide powder and mixed materials are mixed and then fed into the taper hopper, and the calcium carbide powder mixture enters the extrusion dies and is extruded by the female dies of the two extrusion dies to form the calcium carbide balls or blocks. By the calcium carbide powder forming equipment, the calcium carbide balls or blocks can be manufactured safely, calcium carbide powder dust flying is inhibited, the manufactured calcium carbide balls or blocks can be reused in acetylene generating kettles, even reaction speed and high gas generating quantity, and economical benefits are increased.

The invention belongs to the technical field of labels, and particularly discloses a water-based emulsion for a beer label and a preparation method thereof. The water-based emulsion is prepared from the following components in parts by weight: a phase A of 80-150 parts of acrylic resin and 250-350 parts of deionized water, a phase B of 1-10 parts of a reactive emulsifier and 3-5 parts of deionizedwater, a phase C of 0.5-1.5 parts of an initiator and 1-15 parts of deionized water, a phase D of 10-25 parts of a compound composed of diacetone acrylamide and adipic acid dihydrazide and 5-15 partsof deionized water, a phase E of 250-400 parts of mixed reactants and a phase E1 of 20-40 parts of mixed reactants, wherein the mass ratio of the diacetone acrylamide to the adipic acid dihydrazide is 2-3:1. The water-based emulsion belongs to the self-crosslinking type and has excellent alkali resistance, adhesive force and bottle sticking glue resistant performance, the problems that in the prior art, a beer label coating is poor in alkali resistance, poor in bottle sticking glue resistance and poor in water resistance, the wet adhesive force is poor, and an original coating is low in viscosity and difficult to clean can be solved, the water-based emulsion can be better recycled and is more environmentally friendly, and the pollution to the environment is reduced.

The invention provides a nickel-free hole sealing agent for improving the compactness of an aluminum alloy anode oxide film. The nickel-free hole sealing agent is prepared from, by weight, 8-8.5 parts of magnesium acetate, 19-20 parts of triethanolamine, 3-3.2 parts of ammonium acetate, a proper amount of deionized water, 0.2-0.4 part of zirconium oxychloride, 1.1-1.2 parts of lithium stannate, 0.3-0.4 part of vitamin E, 0.4-0.5 part of titanyl sulfate, 0.4-0.5 part of lithium silicate, 2.6-2.8 parts of lauryl fluorine heptyl propyl trimethoxysilane, 1-1.2 parts of tetrabutyl titanate, 45-48 parts of ethyl alcohol, 8.6-9 parts of ammonium hydroxide and 0.3-0.4 part of fluorine-containing surfactant. Due to the fact that zirconium oxychloride, lithium stannate, vitamin E and titanyl sulfate are adopted, the nickel-free hole sealing agent can permeate to the bottom of a gap, the reaction rate is even, the compactness of the oxide film can be greatly improved, and corrosion resistance is greatly improved.