Method for producing modified white carbon black

Abstract

The invention discloses a method for producing modified white carbon black. The method comprises the following steps of: A, adding water glass, water and a dispersing agent according to a proportion, stirring and heating; B, simultaneously dropwise adding concentrated sulfuric acid and 20 to 30-baume degree water glass into reaction equipment and determining that equivalent concentration of excessive Na2O of the water glass in reaction solution is 0.03 to 0.3; C, adding an activating agent and a modifying agent for reaction to generate modified hydrated silicon dioxide with amorphous structure; D, adding an acid to regulate the reaction solution; E, cooling, aging, filtering, washing, homogenizing and pulping; and F, drying and collecting with cyclone. In the method, the white carbon black is precipitated and prepared by using one-step process of dilute water glass and concentrated sulfuric acid, so that the production flow is simplified, the utilization rate of the equipment is improved, synchronous organic implementation of liquid-phase preparation technology and modification technology of the white carbon black is realized, and the dispersibility of project products and rubber reinforcement are improved; and by controlling the reaction process by the Na2O measuring method instead of a pH method, the control accuracy in the reaction process is improved, and stable and reliable product quality is guaranteed.

Description

technical field [0001] The invention relates to a production method of modified white carbon black. Background technique [0002] Silica is a new type of fine chemical product in modern industry. With the advancement of science and technology, its performance has been continuously recognized and its use has been continuously expanded. [0003] The production methods of white carbon black include physical method and chemical method. In order to obtain amorphous white carbon black with good activity and high reinforcement, chemical method is required. Chemical methods are divided into dry pyrolysis and wet precipitation. Dry pyrolysis is divided into gas phase method and arc method; wet precipitation method is divided into sulfuric acid, hydrochloric acid, nitric acid and carbon dioxide precipitation method. At present, the production of white carbon black mainly adopts two production processes: gas phase method and sulfuric acid and hydrochloric acid precipitation method. ...

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Problems solved by technology

[0008] One is that the product has high gel content, large specific surface area, poor dispersion, and very unstable quality. This method uses the pH value of the reaction solution to control the amount of sulfuric acid added, and we have found through experiments that due to the influence of temperature on the pH meter and the deposition of silica rubber on the electrode, etc., the accuracy of pH decreases, and it cannot truly reflect the changes in the alkalinity of the reaction environment between 0.02 and 0.1mol / L, and the process of silica aggregation is greatly affected by pH Large, which eventually leads to serious differences in the structure of silica, which is the main reason for the fluctuation of product performance caused by traditional processes;

[0009] Second, acid dilution and batching equipment and two sets of reactors are required. There are too many control links in the production process, the production cycle is long, and the production capacity is relatively low.

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