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A kind of preparation method of highly dispersible silicon dioxide

A silica, high dispersibility technology, applied in the treatment of dyed polymer organic compounds, fibrous fillers, etc., can solve the problem of tear strength, elongation at break, low tear strength, high abrasion and heat generation of rubber products , the original particle size of silica is large, etc., to achieve the effect of improving dispersibility, reducing wear and heat generation, and enhancing tear strength

Active Publication Date: 2016-05-18
QUECHEN SILICON CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the primary particle size of the white carbon black obtained by the above method is relatively large and the dispersibility with rubber mixing is poor, so that the abrasion and heat generation of rubber products are high, and the tear strength, elongation at break and tear of rubber products are high. low cracking strength

Method used

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  • A kind of preparation method of highly dispersible silicon dioxide
  • A kind of preparation method of highly dispersible silicon dioxide
  • A kind of preparation method of highly dispersible silicon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: the preparation of silica S1

[0026] 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 ; Among them, in solid sodium silicate, SiO 2 / Na 2 The weight ratio of O is 3.35;

[0027] 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;

[0028] 3) Synthesis: such as figure 1 As shown in S106, add an appropriate amount of water and dilute liquid sodium silicate (the added water The t...

Embodiment 2

[0034] Embodiment 2: the preparation of silica S2

[0035] 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 ; 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 water Th...

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 of high-dispersity silicon dioxide, which comprises the following steps that sulfuric acid and a sodium silicate solution react to generate silicon dioxide pulp; the silicon dioxide pulp is filtered; a filtered matter is obtained; the filtered matter is pulpified; silicon dioxide pulp liquid is obtained, wherein a macromolecular active agent is added to the silicon dioxide pulp liquid; and the silicon dioxide pulp liquid is dried. The particle size of silicon dioxide particles prepared by utilizing a production technology of silicon dioxide is appropriate; the dispersity of silicon dioxide is high when silicon dioxide is mixed with rubber; and when silicon dioxide serves as a reinforcing material, abrasion and heat generation of a rubber product can be reduced obviously, and the tensile strength at break, the elongation at break and the tearing strength of the rubber product can be improved significantly.

Description

technical field [0001] The invention relates to the technical field of chemical production, in particular to a method for preparing highly dispersible 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09C1/28C09C3/10
Inventor 王永庆阙伟东
Owner QUECHEN SILICON CHEM