76results about How to "The amount added is easy to control" patented technology

The invention relates to the technical field of rubber production, aiming to provide an improved nitrile rubber production process, which comprises polymerization, degassing and condensation. Raw materials including acrylonitrile, butadiene, desalinated and deoxidized water, condensed water and molecular weight regulators are fed into a polymerization position, convergence is carried out in a header pipe at the polymerization position, the converged mixture is pre-emulsified sequentially through a pipe pump and a pipe mixer, heat exchange is carried out through an ammonia-cooling heat exchanger for cooling, the cooled mixture, initiator emulsion and activator solution are sequentially fed into a plurality of reactors for polymerization to produce latex, the latex taken out of the reactorsand terminating defoamer solution are fed into a maturing reactor and are fully mixed when the rate of polymerization and conversion reaches 70 plus or minus 5 percent, and the mixture is then fed into a degassing tower to be degassed and into a condensation reactor for condensation. The problem of blockage of the heat exchanger can be avoided, the process is simple, the production process is stable and economical, the Mooney of rubber can be controlled easily, and the produced nitrile rubber has high quality.

The invention belongs to the technical field of the adhesive, and particularly relates to a preparation method of starch base paper packing adhesive, which comprises the steps of mixing, oxidizing and modifying, wherein the mixing step is: water, Urea hydrogen peroxide and starch are added into a reactor to be uniformly mixed, and the mass ratio of the water, the Urea hydrogen peroxide and the starch is: 10 to 16 parts of water, 1 to 4 parts of Urea hydrogen peroxide and 8 to 12 parts of starch; the oxidizing step is: the pH value is adjusted to 8 to 10, catalyst is added to be mixed for 20 to 40 minutes, and then the mixture is statically held for1 to 2 hours; and the modifying step is: modifier and filler are added to be uniformly mixed. The Urea hydrogen peroxide is used as the oxidant of the starch, so not only the production cost is low, the glue consumption quantity is less, but also the production process is free from utilizing defoamer and is free from peculiar smell, and the environmental protection can be realized.

The invention discloses a method for synthesizing tetrabasic lead sulfate by utilizing positive electrode waste lead plaster and application thereof. The method comprises the following steps of washing, filtering, separating, dehydrating, drying, sieving and purifying the positive electrode waste lead plaster, and then, carrying out chemical analysis on a treated mixture, thereby obtaining contents of various components of lead sulfate, lead oxide and free lead in the treated mixture according to chemical analysis, adding lead powder to carry out mixing, grinding and sieving, so that the molar ratio of the lead oxide to lead sulfate after hybrid reaction is (4-5):1; and preserving the heat and presintering the sieved mixture in a resistance furnace, and then heating up to sinter, cooling and drying to obtain the tetrabasic lead sulfate. The method can be used for a storage battery manufacturer to prepare according to convenient conditions of the manufacturer, is simple and easy to implement; the prepared tetrabasic lead sulfate can completely satisfy performance requirements while being applied to battery production, so that early capacity loss of a lead storage battery is restrained, various electrical performances of the battery and a cycle life of the storage battery are greatly improved and prolonged, respectively, thereby not only solving a treatment problem of lead-containing waste materials of the storage battery enterprises, but also lowering production cost of enterprises and changing waste into things of value.

The invention discloses a method for determining the chemical oxygen demand of high-chlorine waste water. The method comprises the following steps: (1) adding a potassium dichromate solution into a water sample put in a conical flask, and then uniformly mixing; (2) adding silver nitrate adopted as a chloride ion screening agent into the water sample put of the conical flask; after chloride ions and silver nitrate in the water sample completely form silver chloride precipitation, combining excessive silver nitrate with potassium dichromate to generate brick-red silver chromate precipitation, wherein when the brick-red precipitation appears in the conical flask, silver nitrate is not added; (3) adding 20mL15g/L of sulfuric acid-silver sulfate solution into the water sample of the conical flask, and then carrying out operation according to a standard potassium dichromate method to calculate the chemical oxygen demand value through a formula; (4) subtracting a modified value from the calculated chemical oxygen demand value to obtain the chemical oxygen demand value in the water sample. The method can prevent mercury sulfate from harming health of experimenters, prevents secondary pollution, is easy and convenient to operate, and can improve accuracy.

This invention relates to a type of midst-carbon and low-alloy steel which used for wheel of light super-speed railroad train. Account for weight it includes : 0.40-0.50%C 0.20-0.70%Si 0.50-0.80%Mn 0.20-0.30%Cr 0.015-0.035%Als S<=0.02% P<=0.02%,the rest is Fe and impurity element. The invention lowers the carbon inside steel, increases the Si, and adds trace quantity Al and Cr. Compared with the background technology, this invention has better property but lower cost.

The invention relates to a food raw material mixing device, which is used for mixing different solid materials. The mixing device comprises a material mixing bucket, a driven rotating disk, a transmission belt, a driving rotating disk, a bracket and a discharging gate, wherein a motor and a feeding device are fixed on the bracket; a driving revolving shaft is fixed in the middle of the driving rotating disk; and the driven revolving shaft is fixed in the middle of the driven rotating disk. The food raw material mixing device related to the invention is simple in structure, and is convenient to use. The adding quantity of materials to be mixed is easy to control, mixing dead corners are avoided, and the working efficiency is increased.

The invention belongs to the metal material field, and relates to an aluminum-boron-carbon-nitrogen master alloy for thinning magnesium and magnesium alloy and a preparation method thereof. The aluminum-boron-carbon-nitrogen master alloy is characterized by comprising the following elements in percentage by mass: 94.00 to 99.00 percent of aluminum, 0.10 to 4.00 percent of boron, 0.10 to 2.00 percent of carbon, and 0.01 to 0.50 percent of nitrogen. The preparation method for the aluminum-boron-carbon-nitrogen master alloy comprises the following steps of: melting pure aluminum in an intermediate frequency furnace and heating the aluminum melt to between 1,000 and 1,200 DEG C, then adding the preheated aluminum-boron and aluminum-carbon master alloy into the aluminum melt in turn while continuously blowing dried pure nitrogen into the aluminum melt, preserving the heat at the temperature of between 1,200 and 1,400 DEG C, stirring the mixture for 2 to 30 minutes, and casting the mixture to form ingots or wires. The prepared aluminum-boron-carbon-nitrogen master alloy has obvious grain thinning effect on the magnesium and the magnesium alloy.

The invention discloses anodizable Al-Mn series cast aluminum alloy and an anodizing process thereof. The alloy comprises, by weight, 2.0% of Mn, 0.7-1.2 % of Co, 0.2-0.4% of Sc, 0.1-0.3 % of Ti, andthe balance being Al. The alloy anodizing process comprises the following steps: cutting, grinding, degreasing, alkali washing, ash removing, cleaning and drying the alloy; and then soaking the obtained aluminum alloy sample in an electrolyte, carrying out anodizing treatment on the aluminum alloy in a direct-current constant-current mode, taking out the workpiece, cleaning the workpiece with deionized water, and drying the workpiece to obtain an anodic oxide film. The tensile strength of the alloy is greatly improved, and the film obtained after anodizing is thick, smooth in surface, uniformin color and attractive; moreover, the alloy has good corrosion resistance, and is suitable for manufacturing a protective shell of a 3C electronic product.

The invention discloses a vanadiferous magnesium intermediate alloy grain refiner and a preparation method and application thereof. The grain refiner comprises, by mass, 90-99% of magnesium and the balance vanadium compound which is composed of at least one of VC, VN, VC<x>N<1-x>, and in VC<x>N<1-x>, x is larger than 0 and less than 1. The invention further discloses the preparation method of the vanadiferous magnesium intermediate alloy grain refiner. According to the vanadiferous magnesium intermediate alloy grain refiner, the vanadium compound can be used as an effective heterogeneous nucleation core of magnesium alloy and prepared into magnesium intermediate alloy, the adding amount is easier to control, using is convenient, the yield is high, and limiting of the content of the magnesium alloy is avoided (the grain refiner can be added into both magnesium alloy containing Al and magnesium alloy free of Al); and after the grain refiner is added into the magnesium alloy, the grain of the magnesium alloy is effectively refined, magnesium and the magnesium alloy are strengthened, and the comprehensive mechanical property of the magnesium alloy is improved.

The invention relates to sodium silicate surface co-sintered light ceramsite and a preparation method thereof. The light ceramsite and the preparation method have the beneficial effects that by spraying a 5-25% sodium silicate solution step by step, during drying, sodium ions dissolved in water diffuse toward the surfaces along with the moisture and gather on the shells of surfaces of raw meal nodules, the sodium ions on the surface layers react with other matters in the sintering process to form fusible matters, thus playing a role of co-sintering agents, and the content of the sodium ions in the co-sintering agents below the surface layers of the raw meal nodules is very low; the ceramsite sintered at a surface layer sintering temperature has relatively low water absorption but the unsintered density of core regions below the surface layers is lower, so that the light ceramsite with low water absorption and low overall density is finally obtained; the problems that the ceramsite not only requires low water absorption and high strength but also requires light volume weight are solved; the preparation method of the sodium silicate surface co-sintered light ceramsite is simple in process and safe to operate, can be used for volume production and is low in cost.

The invention relates to a method for preparing polyvinyl butyral by utilizing organic sulfonic acid catalysis. A sulfonic acid catalyst with a long chain structure is chosen and added with inorganicsalt to promote the process of reaction, consequently, while the sufficient reaction of the materials is ensured, the efficiency is increased, on the other hand, the molecular structure is regulated on the microcosmic level, and thereby a novel low-viscosity product is obtained.

The invention belongs to the technical field of wrought aluminum alloys and discloses a high-thermal-conductivity and low-expansion wrought aluminum alloy and a preparation method thereof. The wrought aluminum alloy comprises the following components in percentage by mass: 1.5-2.5% of Fe, 1.0-2.0% of Ni, 0-0.5% of Yb, 0-0.5% of Mg and the balance of Al, wherein Yb and Mg are not 0 at the same time; the wrought aluminum alloy is obtained by performing mechanical vibration casting on a melt; or after mechanical vibration casting is completed, annealing treatment and rolling deformation treatment are carried out. The invention further discloses a preparation method of the wrought aluminum alloy. According to the high-thermal-conductivity and low-expansion wrought aluminum alloy and the preparation method thereof, Yb and/or Mg compound modification and vibration casting are used for improving the microstructure morphology of the alloy; and multi-target balance optimization of the heat-conducting property, the thermal expansion coefficient and the mechanical performance of the alloy is achieved. The wrought aluminum alloy has high thermal conductivity, low expansibility and high mechanical performance.

The invention relates to light ceramsite co-sintered on the surface by virtue of magnesium chloride and a preparation method of the light ceramsite. The preparation method of the light ceramsite co-sintered on the surface by virtue of magnesium chloride comprises the following steps: spraying a 5-25% magnesium chloride solution in steps, drying and sintering, wherein during drying, magnesium ions dissolved in water diffuse toward the surface along with moisture and are enriched on a shell of the surface of each raw nodule; and during sintering, reaction is carried out on the magnesium ions in the surface layer and other substances to form fusible substances, an effect of a sintering aid is realized, content of magnesium ions in the sintering aid below the surface layer of each raw nodule is very low, the ceramsite sintered on the surface layer at a sintering temperature is relatively low in water absorption rate while density of an unsintered core region below the surface layer is relatively low, and finally the light ceramsite with low water absorption rate and low overall density is obtained. The preparation method of the light ceramsite co-sintered on the surface by virtue of magnesium chloride has the advantages that the problems that the water absorption rate of the ceramsite is low, strength is high and volume weight is low are solved; meanwhile, a technology is simple, operation is safe, mass production can be realized, and cost is low.

The invention relates to a method for measuring the content of free magnesium oxide in steel slag, and particularly adopts an ammonium chloride-glycol-ethanol method to measure the content of the free magnesium oxide in the steel slag. A catalyst ammonium chloride is added into a glycol-ethanol solution to achieve the aim of rapidly extracting the content of the free magnesium oxide in the steel slag. The best adding amount of the ammonium chloride is determined; when the ratio of magnesium in a solution to be detected to the total substance amount of calcium and magnesium is less than 0.1, the more suitable ratio of the ammonium chloride to the total substance amount of the calcium and the magnesium is (12-25):1; and when the ratio of magnesium in the solution to be detected to the total substance amount of the calcium and the magnesium is more than 0.1, the more suitable ratio of the ammonium chloride to the total substance amount of the calcium and the magnesium is (18-30):1. The determination method has the advantages of simple determination process, short needed time, low cost, high accuracy and strong practical applicability.

The invention relates to light ceramsite co-sintered on the surface by virtue of sodium borate and a preparation method of the light ceramsite. The preparation method of the light ceramsite co-sintered on the surface by virtue of sodium borate comprises the following steps: spraying a 5-25% sodium borate solution in steps, drying and sintering, wherein during drying, sodium ions dissolved in water diffuse toward the surface along with moisture and are enriched on a shell of the surface of each raw nodule; and during sintering, reaction is carried out on the sodium ions in the surface layer and other substances to form fusible substances, an effect of a sintering aid is realized, content of sodium ions in the sintering aid below the surface layer of each raw nodule is low, the ceramsite sintered on the surface layer at a sintering temperature is relatively low in water absorption rate while density of an unsintered core region below the surface layer is relatively low, and finally the light ceramsite with low water absorption rate and low overall density is obtained. The preparation method of the light ceramsite co-sintered on the surface by virtue of sodium borate has the advantages that the problems that the water absorption rate of the ceramsite is low, strength is high and volume weight is low are solved; meanwhile, a technology is simple, operation is safe, mass production can be realized, and cost is low.

The invention discloses a magnesium and magnesium alloy grain refining method. The magnesium and magnesium alloy grain refining method comprises the following steps that an intermediate carrier containing a zirconium-based amorphous alloy is prepared, the long-strip-shaped zirconium-based amorphous alloy is shorn into small fragments, in addition, an alloy cutting machine is used for cutting a high-purity magnesium ingot into small magnesium alloy pieces, magnesium scraps generated during cutting are collected and cleaned through absolute ethyl alcohol after collection, the magnesium scraps are placed at the shade place to be dried in the shade, and by mass percent, 20%-40% of the zirconium-based amorphous alloy fragments and 60%-80% of magnesium cuttings are pressed and formed after beingsufficiently mixed; secondly, Mg or the Mg alloy is melted, the intermediate carrier containing the zirconium-based amorphous alloy is added, and stirring is conducted; and thirdly, after standing and heat preservation are conducted, furnace discharging and casting are conducted. Under the conditions that the grain refining method is low in cost, and the technology is simple, the advantages thatthe adding amount is easy to control, pollutant discharging is avoided, the grain refining efficiency is high, the grain refining effect is stable, and the treatment time is short are achieved.