30results about How to "Good particle size dispersion" patented technology

The invention discloses a preparation process of spindle-shaped nano calcium carbonate. High-activity quicklime and carbon dioxide are used as raw materials, and a two-stage carbonization tower is used as reaction equipment for reaction preparation; and the two-stage carbonization tower is formed by serially connecting a primary carbonization tower with a secondary carbonization tower, the effective reaction volume ratio of the primary carbonization tower to the secondary carbonization tower is 1: 4, and the effective reaction volume ratio of the feeding amount of carbon dioxide in every carbonization tower per hour to the carbonization tower is 3-5 L / min: 0.8 L. The spindle-shaped nano calcium carbonate prepared by the method has the advantages of good particle dispersity, uniform size, draw ratio being 200: 40 nm, regular shape, high purity, good dispersion effect and the like. Moreover, the carbonization reaction time of the provided preparation process is greatly shortened, the production efficiency is high, meanwhile, the utilization rate of the reaction equipment is increased, and thus, the preparation process is suitable for being popularized and used in industrial production.

The invention discloses a preparation process of nano calcium carbonate. High-activity quicklime and high purity carbon dioxide are adopted as the raw materials, and a three-stage carbonization tower is taken as the reaction equipment to carry out reaction for preparation of nano calcium carbonate. The high-activity quicklime has an activity degree of 360-380; the purity of the high purity carbon dioxide is greater than or equal to 99%; and the three-stage carbonization tower is formed by series connection of a first stage carbonization tower, a second stage carbonization tower and a third stage carbonization tower of different capacities in order, the effective reaction volume ratio of the first stage carbonization tower, the second stage carbonization tower and the third stage carbonization tower is 1:4:16, and the introduction amount per hour of the high purity carbon dioxide in each carbonization tower and the effective reaction volume of the carbonization tower are in a ratio of 2-3:0.08. The nano calcium carbonate prepared by the method provided by the invention has the advantages of good particle size dispersion and uniform size distribution in the range of 20-30nm, regular morphology and high purity, etc. Also, the preparation process provided by the invention greatly shortens the carbonization reaction time, has high production efficiency, also improves the utilization of the reaction equipment, and is suitable for popularization and application in industrial production.

The invention provides a method for preparing high-viscosity silicone rubber emulsion, which comprises slowly adding high-viscosity silicone rubber into low-viscosity silicone oil and mixing evenly under stirring conditions, adding emulsifiers and emulsification aids in batches, Emulsify water, then slowly add water to finally obtain the finished silicone raw rubber emulsion, wherein the emulsifying aid is polyether modified silicone oil. The emulsion preparation method of the present invention can effectively emulsify and disperse 20 million cp ultra-high viscosity silicon raw rubber. The obtained emulsion is uniformly dispersed, has a small particle size, and has excellent stability. It can maintain good stability without demulsification and delamination. The silicon raw rubber emulsion prepared by the present invention is used as a smoothing agent or a softener, and after the fabric is treated, the hand feeling of the fabric is greatly improved, and no toxic organic solvent or other substances that may cause damage to the skin are used, so there is no potential safety hazard , is a green, healthy and non-toxic fabric smoothing agent.

The invention discloses a method for preparing a modified magnesium hydroxide flame retardant. The method comprises the following steps: preparing a compound emulsifier; dissolving sodium lauryl sulfate and triethanolamine in water to prepare a transparent solution, adding the compound emulsifier and an auxiliary emulsifier in oxidized polyethlene wax, adding the transparent solution after the oxidized polyethlene wax is melted, and agitating to obtain an emulsion; adding an ammonia water solution into the emulsion to obtain an organic modified emulsion; adding an anionic surfactant water solution into magnesium hydroxide, and agitating to obtain powder; drying to obtain magnesium hydroxide powder; adding the organic modified emulsion into the magnesium hydroxide powder, adding a dispersant, cooling to a room temperature, and obtaining magnesium hydroxide modified by the organic emulsion. The modified magnesium hydroxide flame retardant has great dispersibility and great compatibility with organic substances, can be uniformly dispersed in a base material, and cannot cause agglomeration. After the modified magnesium hydroxide flame retardant is added to an organic material, the mechanical property losses of the material can be effectively reduced. The method has the advantages of simple preparing technology, easiness in operation, strong controllability and simple equipment. As no pollution is caused in the whole technical process, energy-saving and environment-friendly requirements are met.

The invention belongs to the technical field of metal organic framework materials, and relates to a method for preparing a ternary composite material by using zeolitic imidazolate frameworks as a template, in particular to a method for synthesizing a ZIF-8-based ternary composite ZnO / ZnCo2O4 / NiO by a solvothermal process and application of the method. The method disclosed by the invention comprises: dispersing per 290 mg of ZIF-8 polyhedron in 30-90 mL of ethanol containing 0.6-1.4 mmol of nickel nitrate, 0.6-1.4 mmol of cobalt nitrate and 421 mg of hexamethylenetetramine, stirring and mixinguniformly, transferring to a reaction kettle, heating at 100 DEG C to 120 DEG C for 2-4 h, cooling to room temperature, collecting by centrifugation and drying at 60 DEG C to 80 DEG C for 12-24 h to obtain a precursor, and annealing the precursor in the air at 300-350 DEG C by rate of 2 DEG C.min<-1> for 2-3 h, so the ternary composite ZnO / ZnCo2O4 / NiO is obtained. The prepared ZIF-8-based ternarycomposite ZnO / ZnCo2O4 / NiO has uniform particle distribution and good particle size dispersion, and has excellent electrochemical performance and good cycling stability when being used as an electrodematerial of a supercapacitor. The method has the advantages of simple process, low preparation cost and less pollution, and is suitable for industrial production.

The invention relates to the field of preparation methods for inorganic functional materials, in particular to a salt-assisted ultrasonic pyrolysis method for preparing M-phase dioxide with a simple synthesis process and a short process, which can efficiently prepare monodisperse, high-purity nanometer vanadium dioxide powders The method for vanadium nano-powder includes the following steps: a. Preparing a precursor solution: dissolving auxiliary salt and tetravalent vanadium salt in deionized water, configuring into a precursor solution of vanadium source, and ultrasonically dispersing; b. preparing M Phase vanadium dioxide nano-powder: put the precursor solution prepared in step a in an ultrasonic atomizer and atomize to generate droplets, which are carried by the carrier gas through a vertical tube furnace and through a high-voltage electrostatic collector Collect, then put the collected powder in deionized water, carry out ultrasonic treatment and filtration, and obtain M-phase vanadium dioxide nano-powder after vacuum drying. The invention is especially suitable for the preparation process for preparing M-phase vanadium dioxide nano-powder.

The invention provides a method for preparing ternary lithium ceramic microspheres by freeze molding, which is characterized in that: mixing the reactant raw materials of ternary lithium ceramic microspheres or ceramic powder with a polymer binder and a solvent, and mixing them in a ball mill Mix evenly to form a suspension slurry, and perform defoaming treatment. The slurry after defoaming treatment is transferred to the microsphere forming device, and the slurry is dropped into the low-temperature cooling medium through the microsphere forming device. During the movement of the droplets, microspheres are formed due to the surface tension, and the microspheres enter the low-temperature cooling medium. The spherical shape can be maintained by rapid cooling, and the ceramic microsphere precursor is formed by low-temperature vacuum drying in a freeze dryer. The microsphere green body undergoes multi-step program-controlled temperature-controlled heat treatment of calcination, calcination and sintering, and finally forms ternary lithium ceramic microspheres. Ceramic microspheres have good sphericity, controllable particle size, good particle size dispersion, high apparent density, high phase purity, and high breaking strength. The preparation method of the invention has the characteristics of simple process and low cost, and is easy to expand to large-scale production.

The invention discloses a technology for preparing spherical nanometer calcium carbonate. The nanometer calcium carbonate is prepared from highly active quicklime and a carbon dioxide gas with the purity being 50% by using a normal-pressure jacketed glass reactor as a reaction device; the activity of the highly active quicklime is 340-360; the carbon dioxide gas with the purity being 50% is prepared through mixing a carbon dioxide gas with the purity being 99% with air; and a continuous carbonization process is adopted, that is the preparation of the nanometer calcium carbonate is continuouslycompleted in the same reaction device. The introduction rate of the mixed gas is 3 L / min, and a ratio of the introduction amount of the carbon dioxide mixed gas every minute to the amount of a slurryin the glass reactor is 3:0.8. The spherical nanometer calcium carbonate prepared through the method has the advantages of good particle dispersion, uniform particle size in 50-80 nm, structured morphology and high purity; and the preparation technology has the advantages of great shortening of the carbonization reaction time, high production efficiency, increase of the utilization rate of the reaction device, and suitableness for being promoted and applied in industrial production.

The invention belongs to the field of nano materials, and discloses a method for preparing nano bismuth oxide by using a liquid phase precipitation method in the presence of lignosulfonate serving as a surfactant. According to the technical scheme of the method, lignosulfonate is used as a surfactant and bismuth nitrate and sodium hydroxide are used as raw materials; the concentration of sodium lignosulfonate is adjusted to 2.5-7.5 g / L, and then nano bismuth oxide is prepared by using a liquid phase precipitation method. In the process of precipitation, the addition of different amounts of surfactants can achieve a steric hindrance effect, so that the direct contact between particles is reduced, the surface tension is lowered, and the surface energy is reduced, thereby lowering the aggregation degree of a dispersion system, caused by the action of a hydrogen bond or VDW (Van der Waals' force), keeping the dispersion system stable realtively, and effectively controlling the size and morphology of nanoparticles. The method for preparing nano bismuth oxide by using a liquid phase precipitation method disclosed by the invention is low in cost and simple to operate, and prepared products are uniform in particle distribution, high in particle properties, good in particle size dispersity and good in morphology; therefore the method can be easily industrialized.

The invention provides a solvothermal method for preparing nano-grade ferroferric oxide. According to the invention, lignosulfonate is adopted as a surfactant, and nano-grade ferroferric oxide is prepared with the solvothermal method. The ferroferric oxide has controllable particle size. The applied lignosulfonate is a waste produced from a paper-making process, such that cost is saved, and the environment is protected.

The invention discloses a surface modification method of ZnS powder. The surface modification method comprises the following steps: stirring oxidized polyethylene powder, deionized water, an emulsifier and other reagents at the normal temperature, heating the mixture and sealing, pressurizing and stirring, keeping pressurization, naturally cooling, adjusting the air pressure to be 0.1-0.5 MPa, stirring the solution until the temperature of the solution is the room temperature, adjusting the pressure to be standard atmospheric pressure, filtering the emulsion, adding ammonia water in the obtained emulsion, adjusting the pH value to be 8.0-9.0, adding the organic modified emulsion in the ZnS powder, stirring the solution, and standing; drying the modified ZnS powder, and naturally cooling the ZnS powder to obtain the surface modified ZnS powder. The modified ZnS powder can be dispersed in a base material well, is high in compatibility, has good antimicrobial, mildew-proof and algae-removing effects in the internal and external wall coating, can be used as a white pigment in the coating and plastics to enhance whiteness, and is high in cohesiveness to bind other inorganic materials; the process is simple, the operation is easy, the preparation process is free of pollution, and the energy-saving and environment-friendly requirements can be met.