The invention discloses a preparation method of friction type silicon dioxide. The preparation method comprises the following steps of: preparation of a first tank of materials: adding sodium sulfate solution into a reaction tank, heating, and then adding hexadecyl trimethyl ammonium bromide, then adding sodium silicate solution and sulfuric acid, controlling PH value, and after addition of the sodium silicate solution, adding the sulfuric acid till the final PH value is 4.4-5.0; preparation of a second tank of materials: adding sodium sulfate solution into another reaction tank, heating, and then adding hexadecyl trimethyl ammonium bromide, then adding sodium silicate solution and sulfuric acid, controlling PH value, and after addition of the sodium silicate solution, adding the sulfuric acid till the final PH value is 4.4-5.0; while stirring, adding a half of the material of the first tank into the material of the second tank, stirring, carrying out pressing filtration, washing and crushing on the formed silicon dioxide to prepare the friction type silicon dioxide. In the silicon dioxide, the RDA (Relative Dentine Attrition) value is 120-140, the PCR (Pellicular Cleaning Ratio) value is 100-130, and the PCR/RDA is equal to 0.80-1. The friction type silicon dioxide has the advantages of low wear, high cleanness and good thickening property.

Preparation method of friction type silicon dioxide

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 belongs to the technical field of silicon dioxide, and particularly relates to friction type silicon dioxide with low refractive index and high transparency as well as a preparation method and application thereof. The preparation method comprises the following step: S1, adding a sodium sulfate solution into a reaction tank, heating the solution to 80-95 DEG C, dropwise adding a sodium silicate solution and a sulfuric acid solution while stirring, controlling the dropwise adding speed of the sodium silicate solution to be 13-15m3/h, controlling the dropwise adding speed of the sulfuric acid solution to ensure that the pH value of a reaction process is 3.0-4.5, and continuously stirring the mixture for 10-15min after dropwise adding is finished; and S2, carrying out filter pressing, washing, spray drying and airflow crushing on the formed silicon dioxide to prepare the friction type silicon dioxide with low refractive index and high transparency. The preparation method provided by the invention is simple, the process is stable, the production cost is low, the pollution is less, the prepared silicon dioxide has high transparency under the condition of low refractive index, and is applied to a transparent toothpaste formula, so that the water consumption can be increased, the consumption of a wetting agent can be reduced, and the production cost of toothpaste is greatly reduced.

Friction type silicon dioxide with low refractive index and high transparency as well as preparation method and application thereof

The invention belongs to the technical field of silicon dioxide, and particularly relates to low-specific-surface-area high-dispersity thickening-type silicon dioxide and a preparation method thereofThe method comprises the following steps: S1, adding a sodium sulfate solution and a sodium silicate solution to a reaction tank, to obtain a mixed solution, heating and keeping a reaction temperature to be 50-60 DEG C, in a stirring process, dropwise adding a sulfuric acid solution until a pH value is 6-7, and ageing; S2, continuously adding water to the reaction tank, heating and keeping a reaction temperature to be 85-95 DEG C, adding the sodium silicate solution and the sulfuric acid solution and performing a parallel flow reaction, and controlling a pH value in a reaction process to be 6-7; S3, after adding the sodium silicate solution, performing subsection ageing, and adding sulfuric acid until the pH value is 40-50, ageing, and preparing slurry; and S4, press-filtering, washing,and spray-drying the slurry, crushing by an air-current mill, and preparing the thickening-type silicon dioxide The thickening-type silicon dioxide has the characteristics of high dispersibility, low specific surface area, high viscosity and high transparency, and has good application prospect

Low-specific-surface-area high-dispersity thickening-type silicon dioxide and preparation method therefor

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 for toothpaste and relates to abrasive silicon dioxide for low-abrasion high-cleaning-power toothpaste and a preparation method thereof. The preparation method comprises: S1, liquefying solid sodium silicate; S2, mixing dilute sulfuric acid and silicon dioxide powder, adding sodium silicate solution under stirring until pH is 2-3, and stirring to obtain acidic silicon sol; S3, injecting the sodium silicate solution and sodium chloride solution, stirring, heating, adding sulfuric acid until pH is 10-11, and adding the acidic silicon sol; S4, adding both the sodium silicate solution and sulfuric acid, keeping pH to be 9.0-9.5, after the sodium silicate solution is completely added, continuing to add sulfuric acid until pH is 2-3, ageing, press-filtering, washing, and drying and crushing to obtain the abrasive silicon dioxide for low-abrasion high-cleaning-power toothpaste; RDA value of the abrasive silicon dioxide is 120-140, PCR value is 120-140, PCR/RDA is 0.86-1, and the abrasive silicon dioxide has low abrasion and high cleaning powder.

Abrasive silicon dioxide for low-abrasion high-cleaning-power toothpaste and preparation method thereof

The invention belongs to the technical field of silica and relates to a preparation method of low defoaming silica. The preparation method comprises S1, adding a sodium sulfate solution into a reactor, stirring the solution, adding a complex surfactant into the solution, and uniformly stirring and heating the solution, S2, adding a sodium silicate solution into the solution, after 0.5min, adding a sulfuric acid solution into the mixed solution, adjusting a sulfuric acid addition rate to control pH to 9.0-9.5 in the reaction process, and then adding a sulfuric acid solution into the mixed solution until terminal pH of 4.0-5.0, S3, continuously stirring the solution at the temperature, carrying out filter pressing on the formed silica, and carrying out washing, drying and crushing to obtain the low defoaming silica. The preparation method has the advantages of simple process, stable process, low production cost and less pollution. The low defoaming silica has low defoaming ability, has good compatibility with a toothpaste foaming agent and effectively enhances washing foam feeling of the toothpaste.

Preparation method of low defoaming silica

The invention belongs to the technical field of silicon dioxide for toothpaste, and relates to a preparation method of silicon dioxide for transparent tooth cleaning toothpaste.The preparation method comprises the steps that 1, a sodium carbonate solution is prepared and added into a sodium silicate solution to obtain a mixed solution; 2, a sodium sulfate solution is added into a reaction kettle, the sodium silicate solution and a sulfuric acid solution are simultaneously and dropwise added while stirring under heating is performed, the process pH is kept to be 7.5-9.5, the end point pH is controlled to be 6.0-7.0, and stirring is performed; 3, water is added, the mixed solution and the sulfuric acid solution are simultaneously and dropwise added while stirring under heating is performed, the process pH is kept to be 5.5-7.5, the reaction end point pH is controlled to be 6.0-7.0, and stirring, filter pressing, washing, drying and crushing are performed to obtain the silicon dioxide.According to silicon dioxide, the copper loss value is 12-15 mg, the light transmittance reaches up to 98%, the oil absorption value is 130-160 ml/100 g, the water absorption capacity is 26-32 ml/20 g, and silicon dioxide is suitable for the transparent tooth cleaning toothpaste.

Preparation method of silicon dioxide for transparent tooth cleaning toothpaste

The invention belongs to the technical field of silicon dioxide, in particular to a preparation method of silicon dioxide of toothpaste with low viscosity and high oil absorption value. The preparation method comprises S1, a sodium silicate solution is allocated; S2, water and the sodium silicate solution are added into a reaction kettle and heated to the temperature of 75-80 DEG C, sulphuric acidis added dropwise while stirring is conducted until the pH value is 9-10, and the addition of the sulphuric acid is ceased; S3, the temperature is increased, the sodium silicate solution and the sulphuric acid are added dropwise simultaneously while stirring is conducted, the pH value during the process is maintained at 9-10, the sulphuric acid is continuously added until the pH value is 3.5-4.0after the dropwise adding of the sodium silicate solution is completed, sulphuric acid addition is ceased, and ageing, pressing filtering and washing are conducted to obtain initial products; S4, theinitial products are placed into a pulp beating tank, glycerol is added, beating is conducted after soaking, and pulverizing is conducted by using an airflow pulverizer after spraying drying is conducted to obtain the silicon dioxide of the toothpaste with low viscosity and high oil absorption value. The method is simple, the process is stable, the production cost is low, prepared silicon dioxidepowder is low in viscosity and high in oil absorption value, and the problem of the post growth of toothpaste viscosity can be better solved after the silicon dioxide is applied to the toothpaste.

Li Lifeng

Papers

Abrasive silicon dioxide for low-abrasion high-cleaning-power toothpaste and preparation method thereof

Preparation method of low defoaming silica

Preparation method of silicon dioxide for transparent tooth cleaning toothpaste

High-adsorption high-dispersion silica and preparation method thereof

Preparation method of silicon dioxide of toothpaste with low viscosity and high oil absorption value