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Preparation method for silicon dioxide

A technology of silicon dioxide and sodium silicate solution, applied in the direction of silicon oxide, etc., can solve the problems of poor mixing dispersibility of silicon dioxide and rubber, and achieve the effect of good dispersibility, enhanced tear strength and suitable size

Active Publication Date: 2013-12-25
QUECHEN SILICON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problem of poor mixing dispersibility of silica and rubber in the prior art, the present invention provides a method for preparing silica, the method comprising:

Method used

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  • Preparation method for silicon dioxide
  • Preparation method for silicon dioxide
  • Preparation method for silicon dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Embodiment 1: the preparation of silica S1

[0024] 1) Dissolving: as in figure 1 As shown in S102, solid sodium silicate (Anhui Quecheng Silicon Chemical Co., Ltd.: solid-2 type) and water are added to the dissolving static autoclave at a mass ratio of 2:1, and water vapor with a pressure of 0.4Mpa is introduced. Fully dissolve for 1.5 hours, filter out the precipitate with a filter press to obtain a transparent and impurity-free concentrated liquid sodium silicate, and its density (20°C) is 1.1g / cm 3 ;

[0025] Among them, in solid sodium silicate, SiO 2 / Na 2 The weight ratio of O is 3.35;

[0026] 2) Adjustment: such as figure 1 As shown in S104, water is added to the concentrated liquid sodium silicate obtained in step 1) to adjust the Na 2 O nSiO 2 The concentration to 2.20mol / l obtains dilute liquid sodium silicate;

[0027] 3) Synthesis: such as figure 1As shown in S106, add an appropriate amount of water and dilute liquid sodium silicate (the added wat...

Embodiment 2

[0033] Embodiment 2: the preparation of silica S2

[0034] 1) Dissolving: as in figure 2 As shown in S202, solid sodium silicate (Anhui Quecheng Silicon Chemical Co., Ltd.: solid-2 type) and water are added to the dissolving static autoclave at a mass ratio of 2:1, and water vapor with a pressure of 0.4Mpa is introduced. Fully dissolve for 2.0 hours, filter out the precipitate with a filter press to obtain a transparent and impurity-free concentrated liquid sodium silicate, and its density (20°C) is 1.3g / cm 3 ;

[0035] Among them, in solid sodium silicate, SiO 2 / Na 2 The weight ratio of O is 3.40;

[0036] 2) Adjustment: such as figure 2 As shown in S204, water is added to the concentrated liquid sodium silicate obtained in step 1) to adjust the Na 2 O nSiO 2 The concentration to 2.35mol / l obtains dilute liquid sodium silicate;

[0037] 3) Synthesis: such as figure 2 As shown in S206, add an appropriate amount of water and dilute liquid sodium silicate (the added...

Embodiment 3

[0043] Embodiment 3: the preparation of silica S3

[0044] 1) Dissolving: as in image 3 As shown in S302, solid sodium silicate (Anhui Quecheng Silicon Chemical Co., Ltd.: solid-2 type) and water are added to the dissolving static autoclave at a mass ratio of 2:1, and water vapor with a pressure of 0.4Mpa is introduced. Fully dissolve for 2.2 hours, filter out the precipitate with a filter press to obtain a transparent and impurity-free concentrated liquid sodium silicate, and its density (20°C) is 1.2g / cm 3 ;

[0045] Among them, in solid sodium silicate, SiO 2 / Na 2 The weight ratio of O is 3.34;

[0046] 2) Adjustment: such as image 3 As shown in S304, water is added to the thick liquid sodium silicate obtained in step 1) to adjust the Na 2 O nSiO 2 The concentration to 2.37mol / l obtains dilute liquid sodium silicate;

[0047] 3) Synthesis: such as image 3 As shown in S306, add an appropriate amount of water and dilute liquid sodium silicate (the added water Th...

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Abstract

The invention provides a preparation method for silicon dioxide. The method comprises the following steps: allowing a sodium silicate solution and sulphuric acid to react to obtain silicon dioxide slurry; filtering the silicon dioxide slurry to obtain filtered matters; pulpifying the filtered matters to obtain silicon dioxide seriflux with the viscosity below 1000 cp; drying the silicon dioxide seriflux. The silicon dioxide prepared by the manufacturing technology of the silicon dioxide provided by the invention has suitable particle size, and high dispersity while milling with rubber; when the silicon dioxide is used as a reinforced material, the abrasion and the heat-generation of a rubber product can be obviously lowered, and the breaking strength, the elongation at break, and the tearing strength of the rubber product can be obviously strengthened.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for preparing silicon dioxide. Background technique [0002] Hydrated silica is commonly known as white carbon black, and its molecular formula is SiO 2 ·nH 2 O, the appearance is powdery, microbead, granular, and silica is a widely used material for rubber reinforcement. Generally speaking, the reinforcing effect of silica (except for ultrafine and surface treatment) is not as good as that of carbon Black is good, so it is a semi-reinforcing filling material. Therefore, the percentage of replacing carbon black should be determined according to the application occasion. Precipitated silica is used in rubber products such as inner and outer tires of automobiles, dump trucks, trucks, tractors, forklifts, bicycles, etc., industrial belts, hoses, gaskets, rubber sheets, threshing rubber rollers for grain processing, and rubber shoes. Silica is more or less us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/113
Inventor 王永庆阙伟东
Owner QUECHEN SILICON CHEM