High-whiteness, non-heat-treated hydrophobic precipitated silica

A technology of precipitated silica and hydrophobicity, which is applied in the direction of thin material treatment, dyed organic silicon compound treatment, silicon oxide, etc., can solve the problems of high price and high cost of silica, and achieve low thickening performance, good mechanical and optical properties, and good additive effect

Inactive Publication Date: 2003-03-26
DEGUSSA AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Another disadvantage of heat treatment at temperatures between 200 and 400°C is that the process is relatively costly and thus makes hydrophobic silica comparatively more expensive

Method used

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  • High-whiteness, non-heat-treated hydrophobic precipitated silica
  • High-whiteness, non-heat-treated hydrophobic precipitated silica

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0293]The base silica is dried via a spin-flash dryer and coated with a silicone oil (eg DOW CORNING(R) 200 FLUID 50 CS, carbon content about 33%, viscosity 50 mPas). The silica was then aged (at least 48 hours at room temperature) until the methanol wettability was at least 20%. The analytical data for the aged silica are presented in Table 1.1.

[0294] Analytical data for aged silica

water

％

5.2

pH value

6.1

Conductivity

μS

41

N 2 surface area

m 2 / g

84

CTAB surface area

m 2 / g

132

Tamping density

g / L

317

Alpine SR>180 microns

％

63

reflectivity

％

95.9

C content

％

4.12

Methanol wettability

％

＞20

[0295] The base silica was coated with silicone oil (dimethylpolysiloxane, 50 mPas, eg DOW CORNING(R) 200 FLUID 50 CS, carbon content about 33%) in a 1:1 mass ratio in a Gericke mixer. The powder thus obtained w...

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Abstract

To provide a hydrophobic precipitated silica which has a high whiteness and can be well blended in a compounded silicone rubber, and also to provide a method for production thereof and the use thereof.

Description

technical field [0001] The present invention relates to hydrophobic precipitated silicas which are prepared without heat treatment, have high whiteness and function well in silicone rubber formulations and exhibit high reinforcement in silicone vulcanizates. Background technique [0002] It is known, for example, from DE 30 85 905 to treat finely divided solids, metal oxides and silicates with organosilicon compounds, such as organopolysiloxanes. The heat treatment performed therein is carried out under a nitrogen inert atmosphere. Furthermore, hydrophobic silicates are known, for example, from DE 24 35 860 , DE 22 42 728 and DE 2513 608 . [0003] In these documents, hydrophilic silicates and precipitated silicas are hydrophobized by reacting the silicates and precipitated silicas with organosilicon compounds. As hydrophobic agents, for example, organohalosilanes and organopolysiloxane compounds are used. [0004] Processes for the preparation of hydrophobic silicas are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D19/04B01J2/30C01B33/18C08K9/06C08L83/04C08L101/00C09C1/28C09C1/30C09C3/12
CPCC01P2006/42C01P2006/82B01D19/0409C01P2006/12C01P2006/19C01P2006/40C01P2006/10Y10T428/2995C01P2006/80C09C1/3081B01J2/30C01B33/18C01P2006/60
Inventor M·索尔茨M·克姆普夫C·潘茨R·施莫尔
Owner DEGUSSA AG
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