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Preparation method of calcium silicate powder with low pH value, high oil absorption value and large specific surface area

A technology of calcium silicate powder and specific surface area, which is applied in the direction of silicate, alkaline earth metal silicate, etc., can solve the problems of high pH value and limited application, and achieve simple operation, improved mechanical properties, and increased oil absorption value Effect

Active Publication Date: 2016-07-06
HENAN WANGWU NANO TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During this process, due to the formation of calcium silicate in a strong alkaline solution, the surface of the powder contains more hydroxide ions and the pH value is as high as 13-14. Such a high pH greatly limits its application in rubber, plastic, paper, etc. applications in fields such as

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  • Preparation method of calcium silicate powder with low pH value, high oil absorption value and large specific surface area

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Embodiment 1

[0026] A preparation method of calcium silicate powder with low pH value, high oil absorption value and specific surface area, comprising the steps of:

[0027] (1) Synthesis of calcium silicate:

[0028] ① Disperse 16g of calcium hydroxide powder in 100g of water, shear and emulsify in a high-shear emulsifier at 25°C and 2000 rpm for 30 minutes to form a calcium hydroxide suspension, and set aside;

[0029] ②Dissolve 45.4g of sodium silicate in 200g of water (modulus 2.4), raise the temperature to 70°C, add dropwise the calcium hydroxide suspension obtained in ①, and complete the dropwise addition in 20 minutes; raise the temperature to 80°C, under the condition of 2000 rpm Shear emulsification reaction for 1 hour to obtain calcium silicate slurry;

[0030] (2) Suction filtration: suction filtration of calcium silicate slurry to obtain a filter cake, and the filtrate is recovered for the preparation of sodium silicate;

[0031] (3) Shear emulsification to form a slurry: add...

Embodiment 2

[0035] A preparation method of calcium silicate powder with low pH value, high oil absorption value and specific surface area, comprising the steps of:

[0036] (1) Synthesis of aluminum-containing calcium silicate:

[0037] ① Disperse 16g of calcium hydroxide powder in 100g of water, and shear and emulsify in a high-shear emulsifier for 30 minutes at 25°C and 2000 rpm to form a calcium hydroxide suspension for later use;

[0038] ②Dissolve 0.7g of aluminum sulfate octadecahydrate in 50g of water to form an aluminum sulfate solution;

[0039] ③Dissolve 45.4g of sodium silicate in 200g of water (modulus 2.4), raise the temperature to 70°C, add dropwise the aluminum sulfate solution in ②, and finish adding dropwise in 5 minutes, then add dropwise the calcium hydroxide suspension in ①, for 20 minutes The dropwise addition is completed; the temperature is raised to 80°C, and the shear emulsification reaction is carried out at 2000 rpm for 1 hour to obtain calcium silicate slurry;...

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Abstract

The invention relates to a preparation method of calcium silicate powder with low pH value, high oil absorption value and large specific surface area. The preparation method comprises the following steps: (1) adding water into calcium hydroxide and performing shearing emulsification to obtain a calcium hydroxide suspension; (2) dropwise adding the calcium hydroxide suspension into a sodium silicate solution or an aluminum compound-containing sodium silicate solution to generate calcium silicate slurry; (3) performing suction filtration of the calcium silicate slurry, adding water into the obtained filter cake and performing shearing emulsification to obtain dealkalized calcium silicate slurry; and (4) dropwise adding acid silicic acid solution into the dealkalized calcium silicate slurry to form a calcium silicate suspension with pH value of 9-11; and washing and drying to obtain calcium silicate powder with low pH value. The powder has the characteristics of low pH value, high brightness, high oil absorption value, large specific surface area and the like and can be used as filler of the base materials such as rubber, plastic and paper so as to improve the mechanical properties of the base materials.

Description

technical field [0001] The invention belongs to the technical field of preparation of new materials, and in particular relates to a method for preparing calcium silicate powder with low pH value, high oil absorption value and specific surface area. Background technique [0002] Calcium silicate usually consists of quicklime, milk of lime, calcium chloride, etc. as the calcium source, and sodium silicate, silicon dioxide, quartz sand, and diatomaceous earth as the silicon source, using hydrothermal method, sol-gel method, and precipitation method Prepared. During this process, due to the formation of calcium silicate in a strong alkaline solution, the surface of the powder contains more hydroxide ions and the pH value is as high as 13-14. Such a high pH greatly limits its application in rubber, plastic, paper, etc. applications in other fields. [0003] How to reduce the pH value of calcium silicate powder has become an urgent problem to be solved. Chinese invention patent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/24
CPCC01B33/24C01P2006/12C01P2006/19
Inventor 张治军蔡天聪李小红
Owner HENAN WANGWU NANO TECH
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