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

Pending Publication Date: 2022-08-09
FUJIAN YUANXIANG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the ultra-fine product has fine particles and light bulk specific gravity, which leads to increased packaging, storage and transportation costs. At the same time, there is a lot of dust in the process of ultra-fine processing and customer use, and the powder is slow to eat during rubber mixing. It needs to be added multiple times and mixed. Long time (basically more than 5h), this method takes a long time for rubber mixing, high energy consumption and low efficiency
Based on the above reasons, its application in high-demand silicone rubber is limited

Method used

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

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preparation example Construction

[0032] The present invention relates to a kind of preparation method of high-dispersion hydrated silica for silicone rubber, comprising the following steps:

[0033] Step 1: Preparation of reaction materials, including:

[0034] The silane coupling agent is hydrolyzed by adding the hydrolyzed solution previously compounded by water and polyol to obtain silane hydrolyzed solution C; the silane coupling agent is selected from one or two compounds of HMDS or KH550. The polyol is n-butanol or glycerol; the mass ratio of the silane coupling agent, water and polyol is 1:4-6:2;

[0035] Take low-iron solid water glass (iron content ≤ 120ppm) and purified process water (conductivity ≤ 100μs / cm) into the autoclave successively in a certain proportion, pass 0.7MPa steam to dissolve, and maintain the pressure for 2-2.5h. Then put it into the storage tank for more than 24 hours, and filter it with a plate and frame filter press; after the sodium silicate and purified process water obtain...

Embodiment 1

[0043] A preparation method of highly dispersed hydrated silica for silicone rubber, comprising the following steps:

[0044] Step 1: Preparation of reaction materials, including:

[0045] 10.5kg of HMDS was added to 50kg of 10% glycerol solution, and hydrolyzed at room temperature for 20min under stirring to obtain silane hydrolyzed solution C;

[0046] Take 7t low iron solid water glass (iron content≤120ppm) and 14m 3 Purified process water (conductivity≤100μs / cm) was added to the autoclave successively, 0.7MPa steam was introduced for dissolution, and the pressure was maintained for 2.5h. Then put it into the storage tank for more than 24 hours, and filter it with a plate and frame filter press; after the sodium silicate and purified process water obtained after filtration are evenly mixed according to a mass ratio of 1:0.4, they are filtered by a plate and frame filter press and a bag filter. After filtration, it is pumped into the storage tank, and silane hydrolyzed sol...

Embodiment 2

[0054] A preparation method of highly dispersed hydrated silica for silicone rubber, comprising the following steps:

[0055] Step 1: Preparation of reaction materials, including:

[0056] 10.5kg of HMDS was added to 50kg of 10% glycerol solution, and hydrolyzed at room temperature for 20min under stirring to obtain silane hydrolyzed solution C;

[0057] Take 7t low iron solid water glass (iron content≤120ppm) and 14m 3 Purified process water (conductivity ≤ 50μs / cm) was added to the autoclave successively, 0.7MPa steam was introduced for dissolution, and the pressure was maintained for 2.5h. Then put it into the storage tank for more than 24 hours, and filter it with a plate and frame filter press; after the sodium silicate and purified process water obtained after filtration are evenly mixed according to a mass ratio of 1:0.4, they are filtered by a plate and frame filter press and a bag filter. After filtration, it is pumped into the storage tank, and silane hydrolyzed so...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/193C01B33/18C08K9/06C08K3/36C08L83/04
CPCC01B33/193C01B33/18C08K9/06C08K3/36C01P2006/12C01P2006/19C01P2004/52C01P2004/61C01P2006/90C08L83/04
Inventor 谭玉泉王承辉王芳可
Owner FUJIAN YUANXIANG CHEM
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