The invention belongs to the technical field of silica, and particularly relates to a preparation method of a silica with high specific surface area and high oil absorption. The preparation method of the silica with high surface area and high oil absorption provided by the invention uses sulfuric acid and sodium silicate as reaction raw materials, uses a sodium sulfate solution as reaction base liquid, and comprises the following steps of firstly adding the sodium sulfate solution, heating, then adding a sulfuric acid solution, then adding a sodium silicate solution, reacting at a condition of a specific pH value, filtering and washing to remove salt, drying, crushing and screening to obtain the silica. The preparation method of the silica with high specific surface area and high oil absorption, provided by the invention, has the advantages of simple and easy-to-control reaction, short production period, low cost and suitability for large-scale production; meanwhile, the silica prepared by the preparation method of the invention has the advantages of high specific surface area and high oil absorption, has a relatively high load for a surfactant, fully meets the requirements of application of the silica in concentrated detergents, and is a relatively ideal concentrated detergent additive.

Preparation method of silica with high specific surface area and high oil absorption

The invention discloses a production method of silicon dioxide for a PE accumulator diaphragm. The method comprises the following steps: mixing sodium silicate solution with 19-25% of mass percentage and a nonionic surfactant; adding an inorganic acid into the mixed liquid, and raising the temperature to 45-70 DEG C after generating gel, continuously adding the inorganic acid to regulate the pH value of the mixed liquid to be 3-5, and then adding an alkali, regulating the pH value of the mixed liquid to be 8-10; enabling the mixed liquid of which the pH value is 8-10 to be reacted for 60-120 min in 85-95 DEG C of the temperature, and then adding the inorganic acid to regulate the pH value to be 3-4, and aging for 30-60 min to obtain slurry; washing the slurry, and adding an anionic surfactant to obtain the silicon dioxide. The prepared product has large specific surface area, large pore volume and small aperture. The surface tension of the prepared silicon dioxide is small. The method is suitable for preparing the accumulator PE diaphragm.

Production method of silicon dioxide for PE accumulator diaphragm

The invention belongs to the technical field of silica preparation, and particularly relates to silica with high fluidity and high oil absorption value for washing powder and a preparation method thereof. The preparation method of silica comprises the following steps: S1, adding water into a reaction kettle, adding a sulfuric acid solution under stirring, performing heating, dropwise adding a sodium silicate solution until a pH value is 3.5-4.5, then simultaneously dropwise adding the sodium silicate solution and the sulfuric acid solution to carry out a cocurrent neutralization reaction, controlling a pH value to be 3.0-5.0, simultaneously stopping addition of the sulfuric acid solution when drop addition of the sodium silicate solution is completed, and further performing stirring; S2, continuously adding the sodium silicate solution, stopping drop addition of the sodium silicate solution when a pH value is 7.0-8.0, and performing maturing; and S3, performing pressure filtration andwashing on the formed silica, and performing spray drying treatment to obtain the silica. The silica has uniform particle size distribution, large specific surface area, high oil absorption value andhigh fluidity, and has good application prospects in washing powder.

Silica with high fluidity and high oil absorption value for washing powder and preparation method thereof

The invention belongs to the technical field of silicon dioxide preparation, and particularly relates to silicon dioxide slurry for wet toothpaste and a preparation method thereof. The preparation method comprises the following steps: S1, adding polyvinylpyrrolidone into a sulfuric acid solution to obtain a mixed solution; S2, injecting water glass into a reaction tank, carrying out heating, thenadding sodium stearate and soluble starch, dropwise adding the mixed solution until a pH value is 8.0-9.0, stopping adding acid, and carrying out stirring until initial particles appear; S3, adding asodium sulfate solution, carrying out heating, and dropwise adding water glass and a sulfuric acid solution at the same time for a reaction; and S4, after the sodium silicate is completely added, dropwise adding a sulfuric acid solution until a final pH value is reached, adding a formic acid solution, carrying out aging, and then carrying out filter pressing, washing and pulping to obtain the silicon dioxide slurry. When the silicon dioxide slurry is applied to toothpaste, the addition amount of water can be reduced, the manufacturing cost of the toothpaste can be saved, the toothpaste can beendowed with good friction cleaning performance, the viscosity increase of the toothpaste can be effectively inhibited, and the silicon dioxide slurry has good application prospects.

Silicon dioxide slurry for wet toothpaste and preparation method thereof

The invention belongs to the technical field of precipitated silica and specifically relates to a low-density colored silica particle with a porous structure and a preparation method of the low-density colored silica particle. The preparation method comprises the steps: S1, dropwise adding a water glass solution into a sulfuric acid solution to prepare an acidic silica sol solution; S2, filling areaction tank with the sulfuric acid solution and hydroxyethyl cellulose, then, simultaneously and dropwise adding the acidic silica sol solution and the water glass solution, ending the operation ofdropwise adding the acidic silica sol solution, then, further and dropwise adding the water glass solution until the pH value reaches 3-4, adding a pigment, then, dropwise adding the water glass solution to reach an end-point pH value, and carrying out stirring until a gel is separated from a system; S3, adding ethanol and glycerol into the gel, and carrying out stirring; and S4, carrying out pressure filtering, drying, smashing, washing and drying on the gel to prepare the colored silica particle. The silica particle is good in suspension property, adsorption property and mild grinding property, suitable for application to household chemicals such as body wash, cleaning milk and toothpaste and good in application prospect.

Low-density colored silica particle with porous structure and preparation method of low-density colored silica particle

The invention provides a preparation method for high-adsorbability silicon dioxide. The preparation method comprises the following steps: S1) injecting 8-12m of water into a reaction tank, raisingtemperature to 65-75 DEG C, and evenly stirring at a revolving speed of 25-35Hz; S2) simultaneously adding high modulus water glass solution and sulfuric acid solution for neutralization reaction, andstirring for 15-30min after the high modulus water glass solution and the sulfuric acid solution finish being added; S3) simultaneously adding low modulus water glass solution and the sulfuric acid solution for neutralization reaction into an original reaction material, controlling the pH (Potential of Hydrogen) of a reaction process to be 5-7, 25-35Hz, and stopping reaction after the low moduluswater glass solution finish reacting; S4) ageing for 0.5-1.5h, then, carrying out filter pressing and washing to remove sulfate, drying and smashing to obtain the high-adsorbability silicon dioxide.The silicon dioxide wet cake prepared with the method is characterized in that moisture content is 85%, a specific surface area is 700m /g, and an oil adsorption value is 355ml/100g.

Preparation method for high-adsorbability silicon dioxide

The invention belongs to the technical field of precipitated silica and particularly relates to high-adsorption high-dispersion silica and a preparation method thereof. The preparation method comprises: 1, adding a Carbomer resin into a sodium sulfate solution and stirring the solution to obtain a mixed solution, 2, adding the mixed solution into a reactor, adding a sodium silicate solution into the mixed solution under stirring, heating the solution to 80-90 DEG C, adding sulfuric acid into the solution, stopping acid addition when the pH value is 8.0-9.0, and carrying out aging, 3, adding asodium silicate solution and sulfuric acid into the aged material together, controlling pH in 8.0-9.0, then adding sulfuric acid into the solution after all the sodium silicate is used, stopping acidfeeding when the pH value is 3.5-4.0, and carrying out stirring to obtain silica slurry, and 4, press-filtering the silica slurry and carrying out washing and spray-drying to obtain silica particles with the sizes of 18-25 microns. The silica particles are small and uniform, have high adsorption and high dispersion characteristics, can be used as washing assistants, can be directly used in a detergent and has good anti-caking and flowing aid effects.

High-adsorption high-dispersion silica and preparation method thereof

The invention belongs to the technical field of silicon dioxide, and particularly relates to stably-colored silicon dioxide particles and a preparation method thereof The preparation method comprisesthe following steps: injecting sulfuric acid into a reaction kettle, then adding hydroxyl silicone oil, stirring and activating; adding water glass into the reaction kettle for reaction, adding pigments when the pH of a system is 3-4, stopping addition of the water glass when the pH of the system is 6-7, and continuing stirring until the material system is converted into gel; performing pressurefiltration on the formed silicon dioxide gel, washing, drying and crushing to obtain silicon dioxide particles; adding the silicon dioxide particles into the reaction kettle, adding allyl alcohol polyoxyalkyl ether and chloroplatinic acid-isopropanol, heating for reaction, separating solid particles from a solution after the reaction to obtain colored silicon dioxide particles The preparation method is simple, and stable in technology; by the preparation method, various types of pigments can be effectively enwrapped, and the prepared colored silicon dioxide particles are very stably colored and are free of phenomena of color change, color fading or color bleeding in practical application

Stably-colored silicon dioxide particles and preparation method thereof

The invention belongs to the technical field of silicon dioxide and particularly relates to a method for preparing silicon dioxide for a PE (Polyethylene) partition plate. The method for preparing the silicon dioxide for the PE partition plate comprises the steps: (1) adding a sodium silicate solution and a sodium sulfate solution into a reactor, carrying out uniform stirring, and then, adding polyethylene glycol into the reactor, so as to obtain a mixture solution; (2) heating the mixture solution to the temperature of 70 DEG C to 85 DEG C, dropwise adding a sulfuric acid solution into the mixture solution with stirring, stopping acid adding when the pH is 7.0, and carrying out stirring; and (3) continuing to add the sulfuric acid solution into the mixture solution until the end pH is 3.5 to 4.5, carrying out stirring, carrying out aging, carrying out filter pressing, carrying out washing, controlling the salt content to be lower than 1.5%, then, carrying out spray drying, and carrying out disc-type crushing, thereby preparing the silicon dioxide for the PE partition plate. The method is easy and feasible, the volume of gel in a preparation process can be effectively reduced, and the prepared silicon dioxide is high in oil absorption number and moderate in specific surface area, thereby being applicable to the preparation of the PE partition plate.

Method for preparing silicon dioxide for PE (Polyethylene) partition plate

The invention belongs to the technical field of silica for toothpastes, and particularly relates to silica with low particle size and high dispersion and high transparency for toothpastes and a preparation method thereof. The preparation method comprises the following steps: S1, adding polyethylene glycol to a sodium silicate solution, stirring and dispersing the solution uniformly to obtain a sodium silicate mixed solution; S2, adding a sodium sulfate solution into a reaction tank, starting stirring, and performing heating; S3 under stirring, simultaneously dropwise adding the sodium silicatemixed solution and a sulfuric acid solution, controlling a pH value to 8.5-9.5, controlling a temperature, continuously dropwise adding the sulfuric acid solution after addition of the sodium silicate mixed solution is completed, stopping addition of the sulfuric acid solution when pH is 4.0-5.0 to obtain silica; and S4, performing pressure filtration, washing and spray-drying to obtain silica for toothpastes. The method is simple in process, the prepared silica has small particle size, good dispersion and high light transmittance, and good application in toothpastes is satisfied.

Ren Zhenxue

Papers

Preparation method for high-adsorbability silicon dioxide

High-adsorption high-dispersion silica and preparation method thereof

Stably-colored silicon dioxide particles and preparation method thereof

Method for preparing silicon dioxide for PE (Polyethylene) partition plate

Silica with low particle size and high dispersion and high transparency for toothpastes and preparation method thereof