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Pyrogenically produced silicon dioxide

A silicon dioxide, pyrolysis technology, applied in the direction of silicon dioxide, silicon oxide, inorganic chemistry, etc.

Inactive Publication Date: 2009-02-04
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] A disadvantage of known fumed silicas is that they contain unwanted hydrophobic silica moieties

Method used

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  • Pyrogenically produced silicon dioxide
  • Pyrogenically produced silicon dioxide
  • Pyrogenically produced silicon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 13～16

[0236] Experiments for determining the surface properties of silicone vulcanizates in a rapid mixer, the formula is as follows:

[0237] 62％

Polymer E 50

31.0g

25％

Oil M 1000

12.5g

1％

carbon black

0.5g

15s

2500min -1

4％

crosslinking agent

2.0g

15s

2500min -1

8％

silica

4.0g

2×30s

500min -1

1 drop

Dibutyltin dilaurate

2×60s 2500min -1

[0238] Into a polyethylene beaker with a screw-on lid was added 31 g (62%) of α,ω-hydroxydimethylsiloxypolydimethylsiloxane (E 50, GE Bayer Silicones). Then 12.5 g (25%) of α,ω-trimethylsiloxypolydimethylsiloxane (M1000, GE Bayer Silicones) were added. After adding 0.5 g (1%) of carbon black (Printex 3, Degussa AG), the mixture was mixed in a speed mixer at 2500 rpm for 15 seconds.

[0239] Then 2.0 g (4%) of ethyltriacetoxysilane (AC 3034, G...

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PUM

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Abstract

Fumed silica having a BET surface area of 200+-15 m2 / g, a grindometer value of less than 30 mum and a median value by PCS of 65 to 85 nm is prepared by grinding a fumed silica having a surface area of 200+-25 m2 / g, and silicone rubber containing this silica.

Description

technical field [0001] The present invention relates to fumed silica, a process for its preparation and its use. Background technique [0002] Fumed silica (pyrogenically prepared silica) from Ullmanns dertechnischen Chemie, Vol. 21, p. 464 (1982). [0003] For example, it can be prepared by burning a vaporizable silicon compound such as silicon tetrachloride in a mixture of hydrogen and oxygen. [0004] Commonly and widely used is comminution to form coarse powder (50-500 μm), fine powder (5-50 μm) and finer (less than 5 μm) material. To carry out all shredding tasks, it is necessary to provide and operate a wide variety of technical and industrial equipment, all of which are specific to the particular task. Ullmanns Dertechnischen Chemie 3rd Edition Vol. 1 pp. 616-638 provides a good review of comminution problems and different machines. For fumed silica, the average primary particle diameter (5-50 nm) is significantly lower than that which can be obtained by mechan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18C08K3/36
CPCY10T428/268C01P2006/12C01P2004/64B82Y30/00C08K3/36C01B33/12Y10T428/2982C01B33/183C01P2004/52
Inventor J·迈克M·肖尔茨M·罗施尼亚
Owner EVONIK DEGUSSA GMBH