Method for preparing super fine hydrophobic silicon dioxide

A silicon dioxide, hydrophobic technology, applied in the direction of silicon oxide, etc., can solve the problems of long preparation time, less particle agglomeration, difficult to control and so on

Inactive Publication Date: 2006-04-12
TAIYUAN UNIV OF TECH
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  • Abstract
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Problems solved by technology

[0004] For example: the gas phase method uses silicon halide as the raw material to produce silicon tetrachloride by hydrolysis in an oxyhydrogen flame. It hydrolyzes silicon dioxide gas at a high temperature of 1200°C and then condenses it. The gas phase method has a small concentration of substances and produces The particle aggregation is less, the preparation and roasting temperature is high, the energy consumption in the production process is large, the cost is high, and the pollution is large
[0005] For example: the precipitation method uses basic silicate as the raw material and uses water or organic solvent as the reaction medium. The precipitation method also has various forms: preparing silica with high dispersion performance in organic solvent, acidifying agent and silicate Reaction, precipitation, separation, drying to prepare silica,

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  • Method for preparing super fine hydrophobic silicon dioxide
  • Method for preparing super fine hydrophobic silicon dioxide
  • Method for preparing super fine hydrophobic silicon dioxide

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Embodiment approach

[0100] The present invention will be further described below in conjunction with accompanying drawing:

[0101] figure 1 As shown, the production of ultrafine hydrophobic silica powder must be carried out strictly according to the process flow chart, and each production parameter must be strictly controlled and operated in sequence.

[0102] The chemical materials required for the preparation of tetraethyl orthosilicate, absolute ethanol, deionized water, ammonium chloride, ammonia water, hydrochloric acid, ethylene glycol, and γ-aminopropyltriethoxysilane must be strictly selected. And the purity control is carried out, no impurities can intervene, and by-products are prevented from being generated.

[0103] The required chemical substances must be strictly controlled according to the proportioning and weighing, and must not exceed the maximum and minimum ranges.

[0104] The sol-gel is carried out continuously, and the acidity and alkalinity of the pH value has a great inf...

Embodiment 1

[0122] All production equipment is in ready working condition;

[0123] Select and weigh 5ml of tetraethyl orthosilicate, 50ml of absolute ethanol, 50ml of deionized water, 0.5ml of ammonium chloride, 0.20ml of ammonia water, 0.3ml of hydrochloric acid, 50ml of ethylene glycol, and γ-aminopropyl 0.5 ml of triethoxysilane;

[0124] Sol, put 5 milliliters of the chemical substance ethyl orthosilicate in a three-necked flask, add 50 milliliters of absolute ethanol, after 5 minutes, drop in 50 milliliters of deionized water, stir evenly, and make it clear;

[0125] Adjust pH value: heating temperature 60℃±1℃

[0126] Add 0.5 ml of ammonium chloride and 0.3 ml of hydrochloric acid, stir vigorously for 3 minutes ± 0.3 minutes, keep warm at constant temperature for 12 minutes ± 1 minute, pH value = 3-4, slightly acidic;

[0127] Add 0.20 ml of ammonia water, stir vigorously with a stirrer for 15 minutes, pH=8-9, slightly alkaline;

[0128] Gel, forming a wet gel product;

[0129]...

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Abstract

A process for preparing the superfine hydrophobic SiO2 includes such steps as proportionally mixing ethyl n-silicate, ammonium chloride, de-ionized water, absolute alcohol, hydrochloric acid, ammonia water, gamma-aminopropyltriethoxy silane and ethanediol, preparing sol, preparing gel, baking, grinding, sieving, calcining, cooling, hydrophobic modifying, reaction, filter, baking and examining.

Description

Technical field: [0001] The invention relates to a method for preparing ultrafine hydrophobic silicon dioxide, which belongs to the technical field of methods for preparing inorganic compounds of non-metallic composite materials. Background technique: [0002] Inorganic compound silica is an inorganic additive with excellent performance and wide application. It is commonly known as white carbon black. Thermal, wear-resistant and welding properties, are widely used in rubber, plastics, coatings, adhesives, sealants, optical fiber materials, polymer materials, modern medicine, bioengineering, optics and other fields. [0003] At present, there are many methods for preparing modified silica, such as gas phase method, precipitation method, gravity sedimentation method, etc., and the modified form is modified by adding thiol silane coupling agent, such as 3-thiol Methoxypropyl silane method, adding titanate method, dry method, wet method, heat treatment method, chemical treatmen...

Claims

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Application Information

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IPC IPC(8): C01B33/113
Inventor 许并社解小玲郭睿劼贾虎生刘旭光
Owner TAIYUAN UNIV OF TECH
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