30results about How to "Control reaction rate" patented technology

The invention belongs to the technical field of high polymer materials, and particularly relates to a preparation method of active end group polyarylether sulfone. The preparation method of the active end group polyarylether sulfone comprises the following steps: mixing a dihalogenated aromatic sulfone monomer, an alkaline reagent and an aprotic polar solvent, adding an aromatic dihydroxyl monomer in batches for polymerization reaction, and desalting to obtain a polyarylether sulfone system; the temperature of the polymerization reaction is 120 to 240 DEG C; the number of times of adding the aromatic dihydroxyl monomer to carry out the polymerization reaction is more than three; and mixing the polyarylether sulfone system with an end-capping reagent, and carrying out an end-capping reaction to obtain the polyarylether sulfone. According to the preparation method of the polyarylether sulfone provided by the invention, through fine synthesis of step-by-step polymerization, reaction temperature control, effective control of reaction rate and inhibition of hydrolysis rate of raw materials, the obtained polyarylether sulfone is high in purity, proper in active end group content and good in solution color and luster, and has a better toughening effect when being combined with epoxy resin.

The invention discloses a micro-channel jet reactor. The micro-channel jet reactor comprises a sample introduction unit, a main mixing unit and a reaction unit which are sequentially communicated, the main mixing unit comprises a first inner pipe and a first outer pipe arranged outside the first inner pipe in a sleeving manner; a first annular space is formed between the first inner pipe and the first outer pipe; the sample introduction unit is communicated with the first inner pipe; a second sample inlet is formed in the first annular space, and a plurality of through holes are formed in the first inner pipe; the reaction unit comprises a second inner pipe and a second outer pipe arranged outside the second inner pipe in a sleeving manner; a second annular space is formed between the second inner pipe and the second outer pipe; the first inner pipe is communicated with the second inner pipe; during use, condensate is arranged in the second annular space. The reactor can effectively improve the mixing uniformity degree of reaction liquid, meanwhile, the reaction temperature is controlled, and the reaction rate and selectivity are ensured.

The invention relates to the technical field of isocyanate reaction, and discloses a reaction device for preparing o-tolyl isocyanate and a reaction method thereof.The reaction device comprises a reaction box, a cleaning and stirring mechanism is arranged in the reaction box and used for stirring and cleaning crystals adsorbed on the inner wall, an intermittent conveying mechanism is arranged on one side of the cleaning and stirring mechanism, and the intermittent conveying mechanism is arranged on the other side of the cleaning and stirring mechanism. The phosgene intermittent conveying device is provided with a clean stirring mechanism for intermittently conveying phosgene, the clean stirring mechanism is provided with a pressing discharging mechanism for pushing isocyanate to be rapidly discharged, it is guaranteed that reactants are evenly distributed in the whole reaction mixture through stirring, the local concentration is prevented from being too high or too low, and therefore the overall reaction efficiency and the product quality are improved; according to the reaction device, crystals can be shoveled down from the wall surface during stirring, the service life of the reaction device is prolonged, meanwhile, communication of the exhaust pipe is intermittently cut off, a communication hole in one side of the intermittent rotary table is communicated with the exhaust pipe, and the concentration of reactants in a reaction mixture can be adjusted by intermittently cutting off conveying of phosgene, so that the reaction rate is controlled.

The invention relates to the technical field of chemical equipment, in particular to an efficient reaction kettle for sodium carboxymethyl cellulose production, which comprises a kettle body, a stirring motor is mounted at the top of the kettle body, a stirring shaft rotationally connected into the kettle body is fixedly arranged on an output shaft of the stirring motor, stirring blades are fixedly arranged on the outer wall of the stirring shaft, and a stock bin is further mounted at the top of the kettle body. The bottom of the stock bin extends into the kettle body, and a linkage type discharging mechanism connected between the stirring shaft and the stock bin is mounted on the top surface in the kettle body; according to the efficient reaction kettle for sodium carboxymethyl cellulose production, auxiliary materials can be added into materials in multiple times, the reaction rate can be better controlled, too violent or non-uniform reaction is avoided, the stability of the reaction process is ensured, the reaction uniformity and the product quality are further improved, and the production efficiency is improved by adjusting the time interval of adding the auxiliary materials every time. And the characteristics of the final product, such as viscosity, solubility and the like, can be optimized, so that the final product better meets the requirements of specific application.

The invention discloses a catalyst for hydrogen deoxidation and purification as well as a preparation method and application thereof. The catalyst comprises SiC modified by hydrophobic functional groups as a carrier and an active component Pd loaded on the carrier, the catalyst adopts SiC as a carrier, has the advantages of good heat and electricity conductivity, high temperature resistance, acid and alkali corrosion resistance and the like, and can well disperse and stabilize an active component Pd loaded on the surface. The SiC surface has hydrogen overflow and oxygen overflow phenomena, and can be used as an active surface for hydrogen-oxygen reaction. The unique physicochemical property of SiC can prevent the overheating phenomenon in the catalytic deoxidation process, the reaction rate is effectively controlled, the metal utilization rate is improved, and the use cost is reduced. In addition, SiC is resistant to acid and alkali corrosion, so that after the catalyst is inactivated, metal components can be dissolved through acid and collected for further utilization; siC can be directly recycled and reused, and the cost of the whole service cycle is low. The catalyst takes hydrophobic functional group modified SiC as a carrier, has extremely strong hydrophobicity, can solve the problem of rapid discharge of water formed by hydroxide, and avoids catalyst deactivation.

The invention relates to the technical field of stirring kettles, in particular to a stirring kettle for producing amino acid water-soluble fertilizer, which comprises a stirring kettle body, a fixed cover is fixedly connected to the stirring kettle body, a connecting pipe is fixedly connected to the bottom end of the fixed cover, and a rotating frame is rotatably connected in the fixed cover. The stirring kettle comprises a rotating frame, a plurality of storage covers are fixedly connected to the rotating frame, stirring mechanisms are rotatably connected to the interiors of the storage covers, flushing mechanisms are rotatably connected to the interiors of the storage covers, water guide driving bases are fixedly connected to the outer walls of one sides of the storage covers, and water guide frames are arranged on the storage covers in a sliding fit mode. By arranging various types of stirrers in the fixed cover, according to different material characteristics and process requirements, the stirring mode is flexibly adjusted, different stirring effects are achieved, the mixing uniformity of materials is improved, the mass transfer rate of the materials is improved, the reaction rate is controlled and the like, and it is ensured that fertilizers are mixed uniformly, the quality is stable, and the production process is efficient.

The invention discloses a high-mechanical-property orthokeratology lens material copolymer and a preparation method thereof, and relates to the technical field of high polymer materials. The used raw materials comprise a fluorosilicone material, a hydrophilic monomer, an initiator and a cross-linking agent; the method comprises the following steps: mixing a monomer and an initiator according to a preset ratio, degassing, and carrying out two-stage heating polymerization reaction in a mold. After the polymerization reaction is finished, the copolymer in the mold is taken out, and the required orthokeratology lens material copolymer with the high mechanical property can be obtained through cleaning and drying treatment. The process is simple in reaction step and short in reaction time, the reaction rate can be controlled, and the production cost of the orthokeratology lens is reduced. The copolymer has high oxygen permeability and excellent optical performance, and meanwhile, compared with common like products, the copolymer shows good mechanical performance. The composition is especially suitable for preparing myopia lenses, orthokeratology lenses (OK lenses) or rigid breathable contact lenses (RGP lenses), can provide excellent visual effects and wearing comfort, and reduces irritation to eyes.

The invention belongs to the technical field of organic synthesis, and provides a preparation method of diphenyl disulfide, which comprises the following steps: A, in a dry atmosphere filled with inert gas, mixing halogenated benzene and magnesium powder, reacting to generate a Grignard reagent, and cooling to 0-15 DEG C; and B, dissolving disulfur dichloride in a solvent, dropwise adding the solution into the Grignard reagent obtained in the step A, carrying out a stirring reaction at 0-15 DEG C, carrying out a quenching reaction by using a saturated ammonium chloride aqueous solution, and carrying out extraction, drying and concentration on an organic phase to obtain diphenyl disulfide. The method adopts a one-pot method for direct synthesis, and is green and environment-friendly, and high in yield and purity.

The invention discloses a low-free-formaldehyde sodium glutamate-based gypsum retarder as well as a preparation method and application thereof, and belongs to the technical field of building material admixtures. The preparation method comprises the following steps: by taking sodium glutamate and formaldehyde as raw materials, carrying out an addition reaction at low temperature under a weakly alkaline condition regulated by calcium hydroxide to generate an intermediate; and then heating under an acidic condition to carry out dehydration polycondensation, and neutralizing by negative pressure and lime milk to prepare the sodium glutamate-formaldehyde condensation compound. The invention also discloses a retarder composition containing the condensate and a phosphate / zinc sulfate mixture. According to the invention, the content of free formaldehyde (1t; 300 mg / kg) is obviously reduced through improvement; the problem that the strength of gypsum is reduced due to a traditional retarder is solved by using the chelation of calcium ions and zinc sulfate.

The invention belongs to the technical field of isotope recovery and separation, and discloses a method for recovering high-abundance C13 carbon dioxide from C13 urea based on acidic constant-temperature hydrolysis. According to the method, the hydrolysis rate of the C13 urea is maintained by selecting proper dilute sulfuric acid concentration, sulfate radicals and urea are prevented from forming an adduct by controlling the dilute sulfuric acid concentration, the release efficiency of the 13CO2 is increased, the reaction rate is controlled, and side reaction is avoided. The invention further provides a set of reaction device for recycling 13CO2 through acidic constant-temperature hydrolysis of C13 urea under reduced pressure, the gas-liquid phase contact area and residence time are remarkably increased by arranging the rectifying column, visual water removal and low temperature are realized through the water removal column and the condenser pipe, the problems of external CO2 pollution, high impurity air content and relatively high water content are solved, and the method is suitable for industrial production. And high abundance recovery of the 13CO2 is ensured.

The invention discloses a petrochemical nitrile-containing wastewater treatment device, and relates to the technical field of wastewater treatment.The petrochemical nitrile-containing wastewater treatment device comprises a treatment frame, a servo motor is fixedly installed below the treatment frame, a transmission shaft is fixedly installed at the output end of the servo motor, and the transmission shaft rotationally penetrates through the bottom of the treatment frame; the petrochemical nitrile-containing wastewater treatment device further comprises a feeding device, and the feeding device comprises a temporary storage box, a feeding pipe, a discharging pipe, a bearing rod, a fluted disc, a pressing plate, a conveying pipe, a stirring rod, a fixing rod, a cover plate, a tooth block and a discharging pipe. According to the reaction device, the reactants are uniformly fed in each height interval of the treatment frame, so that the reaction rate is controlled, and meanwhile, the reaction is carried out in a controllable range by quantitatively and repeatedly discharging the reactants, so that the stability and high efficiency of the reaction are ensured.

The utility model belongs to the technical field of reaction kettles, and particularly relates to a chemical reaction kettle convenient for feeding, which comprises a tank body, a motor box is fixedly connected to the top end of the tank body, a blanking groove is fixedly connected to the right side wall of the motor box, and a first motor and two second motors positioned on the lower side of the first motor are fixedly arranged in the motor box. The driving end of the first motor extends rightwards into the discharging groove to be fixedly connected with a material turning roller, the driving end of the second motor extends rightwards into the discharging groove to be fixedly connected with rolling rollers, the two rolling rollers are arranged close to each other, and the material turning roller is located over the two rolling rollers. The reaction kettle has the advantages that large-particle solid materials can be ground into small-particle or powdery materials, the contact area between reactants is increased, the reaction completion efficiency is improved, the reaction rate is increased, intermittent feeding is achieved, the volume of the materials fed every time is controlled, and the reaction kettle is suitable for large-scale production. And the discharge port is prevented from being blocked due to accumulation caused by incomplete reaction in the tank before the materials are fed next time.

The invention relates to a polyacrylate emulsion as well as a preparation method and application thereof. The polyacrylate emulsion comprises the following components: an acrylate polymer, an emulsifier and a solvent, wherein reaction monomers of the acrylate polymer comprise functional monomers and basic monomers, the functional monomers comprise alkyl acrylate, organic fluorine monomers and organic silicon monomers, and the basic monomers comprise soft monomers and hard monomers. The fabric finished by the polyacrylate emulsion provided by the invention has excellent waterproof and oil-proof performance while keeping air permeability and softness.

The utility model discloses a C9 hydrogenated petroleum resin two-stage hydrogenation reaction system, particularly relates to the technical field of petroleum resin, and comprises a two-stage hydrogenation reactor, a first-stage catalyst bed layer, a second-stage catalyst bed layer and a third-stage catalyst bed layer are arranged in the two-stage hydrogenation reactor, the top end of the second-stage hydrogenation reactor is connected with a first-stage hydrogenation product feeding pipeline, the top end of the second-stage hydrogenation reactor is also connected with a new hydrogen pipeline, the new hydrogen pipeline is connected with a circulating hydrogen pipeline, and the new hydrogen pipeline and the circulating hydrogen pipeline are connected and converged and then are divided into four paths; the bottom of the second-stage hydrogenation reactor is connected with a second-stage hydrogenation product pipeline, and the second-stage hydrogenation product pipeline is connected with a solvent oil injection pipeline. According to the utility model, hydrogen is recycled, so that the addition amount of new hydrogen is reduced, and a first-stage hydrogenation reaction product cooler is saved, thereby reducing the one-time investment cost and the later operation cost of the system.

The utility model discloses a device for preventing a galvanized reaction tank pipeline from being blocked. The device comprises a tank body, a cover plate, a liquid outlet, a liquid inlet, a high-position overflow port, an emptying port, a ball valve and a hanging basket, the cover plate is movably connected to the top face of the tank body, the liquid outlet is connected to the middle of one side face of the tank body, the liquid inlet and the emptying port are connected to the bottoms of the opposite side faces of the two sides of the liquid outlet respectively, the high-position overflow port is connected to the top of the side face, where the emptying port is located, of the tank body, and the ball valve is connected to a pipeline connecting the liquid inlet and the emptying port. The hanging basket is movably connected to the inner side of the tank body; compared with the prior art, the hanging basket bearing the zinc plate is placed in the tank body for producing the zinc sulfate solution through the hoisting mechanism, the generated zinc sulfate solution is conveyed into the alloy liquid tank, zinc plating is carried out on the steel wire through electrolysis, and the electrolyzed sulfuric acid solution returns to the tank body from the liquid inlet; the solution in the tank body is not easy to splash out, the reaction condition of the zinc plate is convenient to observe, impurities and the like left by the reaction are deposited on the hanging basket, the cleaning is convenient, and the liquid inlet is not easy to block.

According to the curable organopolysiloxane composition, synthesis raw materials are easy to obtain, the cost is low, organopolysiloxane resin with trace methoxyl groups and hydroxyl groups is synthesized at low temperature by adopting a large amount of water, the organopolysiloxane resin with different molecular weights is matched with methyl phenyl silicone oil with certain flexibility, and the curable organopolysiloxane composition is prepared. And through interaction of a hydrosilylation reaction catalyst, an inhibitor and a tackifier, the curable organopolysiloxane composition has excellent aging resistance, moisture resistance and cold and hot impact resistance on an organic resin substrate. The invention also provides a preparation method of the curable organopolysiloxane composition.

This invention provides an apparatus for preparing isocyanates, comprising: a heater; a reaction vessel disposed within the heater, the reaction vessel including at least a first opening, a second opening, and a third opening, each opening connecting the inside and outside of the reaction vessel; a gas input pipeline connected to the first opening; a condenser connected to the second opening; a receiving bottle connected to the end of the condenser away from the second opening; a distillation column connected to the third opening; a condenser with its inlet connected to the end of the distillation column away from the third opening and its outlet returning to the distillation column; a vacuum pump including at least a first inlet and a second inlet, the first inlet connected to the condenser and the second inlet connected to the condenser; and a gas output pipeline connected to the outlet of the vacuum pump. The preparation apparatus provided by this invention can solve the problems of low product yield, high purification difficulty, high reaction energy consumption, and high production cost.

The invention belongs to the technical field of gold plating, and particularly relates to a preparation process of potassium aurous cyanide, which comprises the following steps: analyzing whether the temperature change is synchronous with the gold element consumption rate change or not by monitoring the temperature change and the gold element consumption rate change in different time intervals and different areas in a period; the method is beneficial for analyzing influence factors of gold element consumption rate change to obtain whether the gold element consumption rate change is related to temperature change or not, is beneficial for avoiding gold element consumption rate abnormity caused by reaction temperature change, and avoids waste of raw materials and increase of energy consumption by regulating and controlling the influence factors and controlling the reaction rate. Untoward effects such as the utilization rate of raw materials are reduced, loss is reduced, and the economic effect of production is improved; the occurrence of side reaction is favorably reduced, and the purity of the potassium aurous cyanide is improved.

The invention discloses a preparation method of nano-copper with high sintering property, nano-copper powder with uniform particle size and excellent sintering property is prepared by adopting a chemical synthesis method, and copper powder with different sizes can be prepared by adjusting the molar ratio of copper salt to a reducing agent and the reaction temperature under the action of a complexing agent. The prepared catalyst has the characteristics of no hard agglomeration, high purity, relatively high specific surface area and relatively high surface activity, meanwhile, excellent high sinterability is maintained, and the preparation method is simple and easy for large-scale application.

The invention discloses a hydrogen production device and method based on aluminum-water reaction. The hydrogen production device comprises a reaction container, a water inlet pipe, a hydrogen outlet pipe, a bearing assembly, an aluminum alloy bar, a blow-off pipe, a monitoring assembly and a controller. The bearing assembly is fixedly arranged in the reaction container, and the multiple aluminum alloy bars are located in the bearing assembly; the water inlet pipe, the blow-off pipe and the hydrogen outlet pipe are respectively communicated with the reaction container; all the aluminum alloy bars in the reaction container are always located below the liquid level; the aluminum alloy bar reacts with water to generate hydrogen and reaction heat; the monitoring assembly is used for acquiring pressure data, temperature data and liquid level data in the reaction container in real time and transmitting the data to the controller; the controller can control the on-off of the water inlet pipe according to temperature data and control the on-off of the blow-off pipe according to liquid level data, and reaction heat is taken out through the discharge of inlet water and a reaction solution, so that the temperature and the liquid level in the reaction container are dynamically stable; and the controller can control the on-off of the hydrogen outlet pipe according to the pressure data, so that the discharge of hydrogen is controlled, and the pressure in the reaction container is dynamically stable. The reaction rate of hydrogen can be controlled, large-scale preparation of hydrogen is achieved, stable supply of hydrogen is guaranteed, the structure is compact, and practicability is high.

The utility model discloses a fluorination furnace convenient to loading relates to fluorination reaction technical field, including furnace body and feed inlet, the feed inlet is located one end at the top of furnace body, is equipped with the conveying cylinder on the furnace body, the conveying cylinder top is equipped with first motor, first motor output is equipped with spiral conveying rod, spiral conveying rod rotatory connection is in the conveying cylinder inside, the conveying cylinder lower part one end is equipped with the feed frame, the conveying cylinder upper part one end is equipped with the discharge frame, and the discharge frame is located above the feed inlet. The utility model adds solid reactant in the conveying cylinder inside, then rotates spiral conveying rod, reaches the effect convenient for adding solid reactant to the inside of furnace body, can more accurately control the adding time and rate of reactant, to maximum limit improves the reaction efficiency and selectivity, not only can simplify the operation process, reduces the operation difficulty, can improve work efficiency.

The utility model relates to the technical field of sodium acetate production, in particular to a sodium acetate solution production device which comprises a reaction tank, an acetic acid storage tank and an alkali liquor storage tank. An acetic acid solution is added into the acetic acid storage tank, a mixed solution of sodium carbonate and sodium bicarbonate is added into the alkali liquor storage tank, and the acetic acid storage tank and the alkali liquor storage tank are respectively connected with the reaction tank; an acid liquid conveying pipe is arranged at the bottom of the acetic acid storage tank, extends into the reaction tank and is connected with the liquid distribution plate; a first-stage alkali liquor conveying pipe is arranged at the bottom of the alkali liquor storage tank and connected with a second-stage alkali liquor conveying pipe, an alkali liquor conveying pump is mounted on the second-stage alkali liquor conveying pipe, the second-stage alkali liquor conveying pipe extends into the reaction tank and is connected with a spraying head, a circulating pipe is arranged at the bottom of the reaction tank, and the spraying head is connected with the circulating pipe. And the circulating pump is connected with the secondary alkali liquor conveying pipe. According to the utility model, the reaction at normal temperature is realized in an upper-layer reaction and reaction liquid circulation mode, so that the production cost is reduced.

The present invention discloses an alloy quantum dot core and a synthesis method thereof, and relates to the technical field of quantum dot materials. The synthesis method of the alloy quantum dot core comprises reacting a mixed solution containing two cationic precursors with an anionic precursor at a crystal cluster generation temperature to obtain a first mixture; mixing the first mixture and a non-eutectic solvent and heating the mixture to a quantum dot generation temperature for reaction. The inventor creatively forms a crystal cluster first and then reacts to form quantum dots, so that the reaction rate can be better controlled, and the size of the quantum dots obtained is relatively uniform. The color purity, fluorescence quantum rate and stability of the quantum dots prepared by the synthesis method provided in the embodiment of the present invention are relatively ideal.

The embodiment of the present application provides a flocculant production device and a production process thereof, and relates to the technical field of flocculant production. The flocculant production device includes: a mixing mechanism, a feeding ratio adjustment mechanism, the feeding ratio adjustment mechanism is located in the middle of the mixing mechanism, a blocking stirring mechanism, the blocking stirring mechanism is located in the middle of the mixing mechanism and the feeding ratio adjustment mechanism, the blocking stirring mechanism is driven to rotate so that the raw materials in the mixing mechanism and the feeding ratio adjustment mechanism are stirred at a uniform speed, and a feeding temporary storage mechanism, the feeding temporary storage mechanism is located at the upper end of the mixing mechanism, and the blocking stirring mechanism is stationary when the raw materials are not stirred. The device can change the capacity of the corresponding temporary storage tank according to the actual weight of the acrylamide monomer solution, so as to realize automatic adjustment of the addition capacity of the corresponding proportion of additives, without the need to weigh the acrylamide monomer solution separately, saving operation time and manpower.

The invention discloses a petrochemical wastewater treatment device containing nitrile, and relates to the technical field of wastewater treatment. The petrochemical wastewater treatment device containing nitrile comprises a treatment frame, a servo motor is fixedly installed below the treatment frame, a transmission shaft is fixedly installed at the output end of the servo motor, and the transmission shaft rotates and penetrates the bottom of the treatment frame. The device also comprises a feeding device, which comprises a temporary storage box, a feeding pipe, a discharging pipe, a receiving rod, a toothed disc, a pressing plate, a feeding pipe, a stirring rod, a fixing rod, a cover plate, a tooth block and a discharge pipe. The petrochemical wastewater treatment device containing nitrile enables the pressing plate to move up and down to discharge reactants through the feeding pipe and the discharge pipe, and evenly puts them in various height intervals of the treatment frame to achieve control of the reaction rate. At the same time, through quantitative multiple discharge of the reactants, the reaction is carried out within a controllable range, and the stability and high efficiency of the reaction are guaranteed.

The application provides a preparation method of nano silver powder with single particle dispersion. The method aims at solving the problems of easy agglomeration, high impurity and high cost of nano silver powder in the prior art. The method comprises the following steps: preparing an oxidizing agent solution containing a high molecular carboxylic acid or a salt thereof, a reducing agent solution, and a bottom solution containing a dispersant and a silver ion release regulator respectively; adjusting the pH of the bottom solution, and adding the oxidizing agent and the reducing agent solutions at the same flow rate to react; then, the target product is obtained through flocculant sedimentation purification, cleaning, drying and air grinding. The method controls the release of silver ions and the reaction rate through the synergistic effect of the high molecular carboxylic acid or the salt thereof, the silver ion release regulator and the like, and realizes the single particle dispersion of the nano silver powder without a large amount of dispersant, and is suitable for the fields of electronic information, biomedicine and the like.

The application discloses a method for regulating material reaction rate to improve finished product rate of aluminum-tantalum intermediate alloy, and relates to the technical field of intermediate alloy materials. The specific steps comprise the following steps: mixing large-granularity tantalum pentoxide, aluminum particles and potassium chlorate to obtain first-grade material; mixing medium-granularity tantalum pentoxide, aluminum particles and potassium chlorate to obtain second-grade material; mixing small-granularity tantalum pentoxide, aluminum particles and potassium chlorate to obtain third-grade material; sequentially adding the third-grade material, the second-grade material and the first-grade material into a reaction crucible, and insulating the materials by using porous aluminum foil, then performing aluminothermic reaction, and then performing gradient cooling to obtain aluminum-tantalum alloy without loose material. The reaction rate of the materials in the crucible gradually increases from top to bottom, the problems of poor slag-ingot separation and insufficient feeding caused by long formation of alloy liquid at the end of solidification and slow backflow are solved, the formation time of the alloy liquid in the later period is shortened, the backflow feeding is accelerated, the loose and stratification defects of the aluminum-tantalum alloy ingot are reduced, and the finished product rate is improved by more than 6%.

The utility model relates to the technical field of emulsifying machines, and discloses a vacuum homogenizing emulsifying machine which comprises a base, two supporting rods are rotatably connected to the interior of the left side of the base, a hollow block is fixedly connected to the bottom end of the left side of a block body, a tank cover is fixedly connected to the bottom of the hollow block, and a first motor is fixedly connected to the inner wall of the top end of the block body; the driving end of the first motor is fixedly connected with a disc threaded rod, the bottom end of the disc threaded rod is fixedly connected with a disc body, the outer wall of the disc body is fixedly connected with a plurality of stirring rods, the outer wall of the top of the disc threaded rod is fixedly connected with a first stud gear, and the inner wall of the top end of a hollow block is rotationally connected with a lifting assembly. According to the reaction kettle disclosed by the utility model, uniform stirring is realized, and sufficient contact between reactants can be ensured by improving uniform stirring, so that the reaction rate is controlled and the reaction efficiency is improved. And the heat generated in the reaction process can be uniformly dispersed, so that the local temperature is prevented from being too high.

The present application discloses a UV light-curable ink and a method for using the same in manufacturing a flexible printed circuit board. Specifically, the method comprises the following steps: preparing an ink mixture; applying the ink to the flexible printed circuit board, and then sequentially drying, pre-baking, exposing, and developing the ink; and UV curing the treated flexible printed circuit board, first using ultraviolet light and visible light alternately. The method described in the present invention can solve the problem of incomplete curing in thicker coatings. The product of the present invention has good flexibility and stability in complex processing, and is particularly suitable for applications requiring thicker coatings.

The invention discloses an inorganic water-based permeable crystallization type waterproof agent and preparation and use methods thereof, and belongs to the field of waterproof materials for concrete, the inorganic water-based permeable crystallization type waterproof agent is at least prepared from the following raw materials by mass: 55.2%-75.1% of lithium silicate, 2.0%-3.6% of sodium hydroxide, 0.8%-1.6% of potassium hydroxide, 0.8%-1.6% of a reaction accelerator, and the balance of water. The anti-cracking coating is prepared from the following components in percentage by weight: 0.1 to 0.15 percent of surfactant, 0.3 to 0.6 percent of film-forming agent, 0.4 to 0.8 percent of anti-cracking fiber and the balance of deionized water. Lithium silicate with small lithium ion radius is mixed with sodium hydroxide, potassium hydroxide and other assistants, the mixture can chemically react with calcium hydroxide in a concrete structure to generate C-S-H gel, and the branch-tendril-shaped C-S-H gel is mutually lapped to form a spatial net structure, so that the compactness of the concrete can be increased, an integral waterproof material is formed, and the waterproof performance of the concrete is improved. Therefore, the mechanical strength of a concrete structure can be improved, and the service life of concrete is prolonged.