Method for modifying ultra-fine silicon dioxide

An ultra-fine silica, modified technology, applied in the treatment of dyed low molecular organic compounds, fibrous fillers, etc., can solve the problems of small particle size, large specific surface area, and decreased mechanical properties of materials

Inactive Publication Date: 2007-12-12
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the small particle size and large specific surface area of ​​ultrafine silica, there are a large number of unsaturated residual bonds and hydroxyl groups in different bonding states on the surface, so it is easy to g

Method used

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  • Method for modifying ultra-fine silicon dioxide

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Experimental program
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Effect test

Embodiment 1

[0011] (1) Prepare 14% water glass solution in a three-necked flask, place it in a water bath at a constant temperature of 85°C, start to add 1mol / L sulfuric acid solution at 85°C dropwise with a dropping funnel, and add it at a rate of about 4-5mL / min, Stir vigorously, and measure the change of pH value of the reaction solution with wide pH value test paper. When the pH value reaches 8-9, stop adding dilute sulfuric acid dropwise, stir and age for about 2 hours, and the aging temperature is 85°C;

[0012] (2) Filtrate the resulting sol while it is hot, and repeatedly wash it several times with deionized water, and wash it with 5% BaCl 2 The solution identifies whether there are sulfate ions in the washed water, and after washing, filter to obtain orthosilicate gel;

[0013] (3) Stir the filtered and washed ortho silicic acid gel with an appropriate amount of n-butanol evenly, then transfer the mixture to a 500mL three-necked flask, heat for azeotropic distillation, and after ...

Embodiment 2

[0016] (1) Prepare 14% water glass solution in a three-necked flask, place it in a water bath at a constant temperature of 85°C, start to add 1mol / L sulfuric acid solution at 85°C dropwise with a dropping funnel, and add it at a rate of about 4-5mL / min, Stir vigorously, and measure the change of pH value of the reaction solution with wide pH value test paper. When the pH value reaches 8-9, stop adding dilute sulfuric acid dropwise, stir and age for about 2 hours, and the aging temperature is 85°C;

[0017] (2) Filtrate the resulting sol while it is hot, and repeatedly wash it several times with deionized water, and wash it with 5% BaCl 2 The solution identifies whether there are sulfate ions in the washed water, and after washing, filter to obtain orthosilicate gel;

[0018] (3) Stir the filtered and washed ortho silicic acid gel with an appropriate amount of n-butanol evenly, then transfer the mixture to a 500mL three-necked flask, heat for azeotropic distillation, and after ...

Embodiment 3

[0022] (1) Prepare 14% water glass solution in a three-necked flask, place it in a water bath at a constant temperature of 85°C, start to add 1mol / L sulfuric acid solution at 85°C dropwise with a dropping funnel, and add it at a rate of about 4-5mL / min, Stir vigorously, and measure the change of pH value of the reaction solution with wide pH value test paper. When the pH value reaches 8-9, stop adding dilute sulfuric acid dropwise, stir and age for about 2 hours, and the aging temperature is 85°C;

[0023] (2) Filtrate the resulting sol while it is hot, and repeatedly wash it several times with deionized water, and wash it with 5% BaCl 2 The solution identifies whether there are sulfate ions in the washed water, and after washing, filter to obtain orthosilicate gel;

[0024] (3) Stir the orthosilicic acid gel after filtering and washing with an appropriate amount of n-butanol, then transfer the mixture to a 500mL three-necked flask, add 5% stearic acid, heat and carry out azeo...

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Abstract

The invention discloses a new method for modifying ultra- fine silicon dioxde. It takes sodium silicate and sulfate as raw material, employs deposition method to prepare original silicic acid gel, then treats it with azeotropic distillation, modifies it with geoceric acid and dimethyldichlorosilane under special process, and prepares powder material with different chemical and physical properties by making use of distingulishing feature of good disperse condition of silicon dioxide particle in azeotropic solution, which is favoable for particle packing. The invention is characterized by simple method, good disperse performance of prepared powder material, low consumption of modifying agent and suitability for large- scale production.

Description

technical field [0001] The invention relates to a functionalized preparation method for inorganic fillers, in particular to a surface modification method for silica powder. technical background [0002] Ultrafine silica, as a kind of inorganic filler, because of its high purity, low density, high specific surface area, good dispersion, surface silanol groups and active silane bonds can form hydrogen bonds of varying strengths, optical properties It has excellent mechanical properties and is widely used in catalyst carriers, polymer composite materials, electronic packaging materials, precision ceramic materials, rubber, paper, plastics, glass fiber reinforced plastics, binders, high-grade fillers, sealants, coatings, optical fibers, precision casting, etc. products in many industries. [0003] As an inorganic filler, silica can generally toughen and reinforce a single matrix material, improve the aging resistance and corrosion resistance of the product, and can mostly reduc...

Claims

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Application Information

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IPC IPC(8): C09C1/28C09C3/08
Inventor 金鑫段蔚波
Owner BEIJING UNIV OF CHEM TECH
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