Preparation method of white carbon black with high structure and high oil absorption value
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A technology of high oil absorption and white carbon black, applied in the direction of silica, silicon oxide, fibrous fillers, etc., can solve the problem that the oil absorption value is difficult to meet the performance requirements
Inactive Publication Date: 2021-12-31
FUJIAN ZHENGSHENG INORGANIC MATERIAL
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Problems solved by technology
The oil absorption value of precipitated white carbon black prepared by the existing precipitation method is difficult to meet the performance requirements. Therefore, the existing process needs to be improved
Method used
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Embodiment 1
[0018] 1. Sodium silicate for preparation reaction: the modulus is 3.4, and the concentration is 1.015mol / L; acid for preparation reaction: sulfuric acid with mass ratio concentration of 30%.
[0019] 2. In a 50L glass reactor with stirring, add 15L water and 6L sodium silicate solution with a concentration of 1.015mol / L, add sodium dodecylbenzenesulfonate according to 0.1% of the mass of sodium silicate, start stirring and heating To 75°C, add sulfuric acid dropwise to the reactor until it becomes a gel, stop adding acid, complete the primary reaction, form a gel within 30 minutes, and continue stirring for 20 minutes.
[0020] 3. Keep the temperature at 75°C, add sulfuric acid for primary reaction and stir until a uniform suspension, the reaction time is 20 minutes, and stop adding acid after adjusting the pH to 4.5, add 3 -Glycidyl etheroxypropyltrimethoxysilane, aged for 30 minutes; stirred and kept at a constant temperature of 75°C, continued to add sodium silicate soluti...
Embodiment 2
[0025] 1. Sodium silicate for preparation reaction: the modulus is 3.4, and the concentration is 1.015mol / L; acid for preparation reaction: sulfuric acid with mass ratio concentration of 45%.
[0026] 2. In a 50L stirred glass reactor, add 15L water and 6L sodium silicate solution with a concentration of 1.015mol / L, add sodium dodecylbenzenesulfonate (SDBS) according to 0.1% of the mass of sodium silicate, Start stirring and heat to 75°C, then add sulfuric acid dropwise to the reaction kettle until it becomes a gel, stop adding acid, complete the primary reaction, form a gel within 25 minutes, and continue stirring for 20 minutes.
[0027] 3. Keep the temperature at 75°C, add sulfuric acid for primary reaction and stir until a uniform suspension, the reaction time is 20 minutes, and stop adding acid after adjusting the pH to 4.5, add 3 -Glycidyl etheroxypropyltrimethoxysilane, aged for 30 minutes; stirred and kept at a constant temperature of 75°C, continued to add sodium sili...
Embodiment 3
[0032] The difference from Example 1 is that the reaction process temperature is set at 85° C., and other conditions are the same as in Example 1.
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Abstract
The invention discloses a preparation method of white carbon black with a high structure and a high oil absorption value. The preparation method comprises the following steps: preparing a sodium silicate solution with the modulus of 3.3-3.5 and the concentration of 0.5-1.230 mol/L and sulfuric acid with the mass ratio concentration of 30-60%; the preparation method comprises the following steps: adding water and a sodium silicate solution into a reaction kettle according to a volume ratio of 100: (30-50), adding sodium dodecyl benzene sulfonate, adding sulfuric acid, reacting to form gel, stopping adding acid, and stirring; continuously adding acid to carry out primary reaction, adjusting the pH value to 3.5-5.0, adding a 3-glycidyl ether oxypropyl trimethoxy silane coupling agent to age, stirring at a constant temperature, and dropwise adding sodium silicate to enable the pH value of the suspension to reach 8.0-10.5; stirring while adding a sodium silicate solution and sulfuric acid to carry out secondary reaction, controlling the pH value to be 8.0-10.5, stopping adding sodium silicate after 40-60 minutes, continuously adding sulfuric acid to completely react, uniformly stirring, adjusting the pH value to be 4.0-5.5, and continuously aging; adding a coupling agent, and continuing aging to obtain a suspension; and carrying out washing, solid-liquid separation, pulping and spray drying to obtain a white carbon black product with a high structure and a high oil absorption value. The white carbon black product prepared by the method has the characteristics of high structure and high oil absorption value.
Description
technical field [0001] The invention relates to the technical field of white carbon black preparation methods, in particular to a preparation method of white carbon black with high structure and high oil absorption value. Background technique [0002] Precipitated silica, also known as precipitated hydrated silica, has a molecular formula of SiO 2 ·nH 2 O, is one of the chemically synthesized amorphous silicic acid products, the appearance is white powder, the main component is silicon dioxide, they are insoluble in water and acid, and become aggregated fine particles after absorbing water; they can dissolve in hydrogen when heated Sodium oxide and hydrofluoric acid, stable to other chemicals; high temperature resistant, non-combustible and good electrical insulation. Due to its special surface structure and unique physical and chemical properties, precipitated silica has been widely used in industrial fields such as rubber, coatings, feed and catalyst carriers including s...
Claims
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Application Information
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