Preparation method of high-dispersion hydrated silicon dioxide for silicone rubber

A hydrated silica, high dispersion technology, applied in silica, silica, chemical instruments and methods, etc., can solve the problems of slow powder consumption, high energy consumption, large dust, etc. Reduce gel generation and reduce particle agglomeration effect
CN114873597APending Publication Date: 2022-08-09FUJIAN YUANXIANG CHEM
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
FUJIAN YUANXIANG CHEM
Publication Date
2022-08-09

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Abstract

The invention relates to the technical field of high-dispersion hydrated silicon dioxide for silicone rubber, in particular to a preparation method of high-dispersion hydrated silicon dioxide for silicone rubber. The method effectively prevents particle agglomeration and greatly reduces the content of hydroxyl groups on the surface, and adopts a high-speed stirring mode to effectively solve the phenomenon of local over-concentration of the reaction material and greatly reduce the generation of gel. And through a step-by-step acidification technology, particles are distributed more uniformly. A dispersing modifier with specific components and proportion is added in the pulping process, so that particle agglomeration in the drying process is effectively reduced. Through the technical means, compared with the existing hydrated silicon dioxide product for the silicon rubber, the indexes of the product disclosed by the invention are effectively reduced in DET / CTAB, surface hydroxyl content, ignition loss, DBP absorption value, particle size distribution width and the like, and the dispersity of the product in the silicon rubber is greatly improved.
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Description

technical field

[0001] The invention relates to the technical field of high-dispersion hydrated silica for silicone rubber, in particular to a method for preparing high-dispersion hydrated silica for silicone rubber. Background technique

[0002] Silicone rubber has the characteristics of excellent high / low temperature resistance, weather resistance, hydrophobicity, electrical insulation and physiological inertia. In recent years, with the rapid development of the silicone industry, the demand for hydrated silica as a reinforcing agent has continued to expand.

[0003] Hydrated silica, commonly known as precipitated silica, contains a large number of hydroxyl groups on the surface and is highly hydrophilic. Due to its large surface area, hydrated silica tends to aggregate secondary, and it is easy to absorb moisture in the air, resulting in strong hydrogen bond association between hydroxyl groups, which further improves the cohesion between particles. In the process of syn...

Claims

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