Method for preparing hydrophobic white carbon black

Abstract

The invention discloses a method for preparing hydrophobic white carbon black. The method comprises the following steps: 1, preparing macromolecular modifier emulsion, namely adding an emulsifying agent, and dispersing a macromolecular modifier in deionized water so as to prepare the macromolecular modifier emulsion; and 2, preparing the hydrophobic white carbon black, namely adding white carbon black into deionized water so as to prepare a white carbon black suspension with the concentration of 5-45%, mixing the macromolecular modifier emulsion prepared in step 1 with the white carbon black suspension according to a ratio of (1:1)-(1:6), adding alkali to regulate the pH value to be 7-12, heating to be 30-90 DEG C, drying and grinding to prepare the hydrophobic white carbon black, wherein the reaction time is controlled between 1-5 hours. The prepared hydrophobic white carbon black has good hydrophobicity, the defoaming performance of a high-silicone emulsion defoaming agent which is subsequently produced can be effectively improved, and the time and the cost for producing the defoaming agent are greatly reduced.

Description

technical field [0001] The invention relates to a preparation method, in particular to a preparation method of hydrophobic white carbon black. Background technique [0002] White carbon black is the general term for white powdery X-ray amorphous silicic acid and silicate products, mainly referring to precipitated silica, fumed silica, ultrafine silica gel and aerogel, including powdered Synthesis of aluminum silicate and calcium silicate, etc. [0003] Now the production of silicone emulsion defoamers will use hydrophilic silica as the main active ingredient. However, in the production process, it generally needs to react with silicone for a long time, which makes the production time of the defoamer very long and consumes a lot of energy. By treating the surface of silica with a hydrophobic agent, a highly hydrophobic silica can be obtained, which can greatly reduce the time for making a silicon emulsion defoamer, and has better performance than the defoamer produced by cl...

AI Technical Summary

Problems solved by technology

[0004] The traditional silica surface modification mainly uses some low-molecular-weight modifiers, so the hydrophobicity of the modified silica is not very high, and there is basically no improvement in the performance of the defoamer, so there is no Very suitable as a raw material for defoamers

[0005] In addition, in the article "Preparation of New Hydrophobic Precipitated Silica" published in "Inorganic Salt Industry", Volume 37, No. 2 in February 2005, dimethyl polycyclosiloxane was used as the preparation of hydrophobic precipitated silica. Modifier of silicon (i.e. hydrophobic silica), however, although dimethyl polycyclosiloxane is a type of polysiloxane, the ring of dimethyl polycyclosiloxane will not be very large, It contains at most 5 silicon elements, so the molecular weight is not very large, all are around several hundred. Although the molecular weight of this size is higher than that of the low molecular weight modifier used in the tradition, it still cannot meet the requirements of improving the hydrophobicity of silica. Require