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Preparation method for hydrophobic precipitated silicone dioxide with high whiteness and superlow hydroscopicity

A technology of precipitated silica and hydrophobicity, which is applied in the treatment of silica, silicon oxide, dyed organic silicon compounds, etc., to achieve the effects of inhibiting hardening, reducing moisture content, and inhibiting post-hardening phenomena

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

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Problems solved by technology

[0012] Another disadvantage of the prior art method is that a low carbon content of less than 3.1% results in a strong thickening effect of the hydrophobic silica in silicone rubber articles

Method used

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  • Preparation method for hydrophobic precipitated silicone dioxide with high whiteness and superlow hydroscopicity
  • Preparation method for hydrophobic precipitated silicone dioxide with high whiteness and superlow hydroscopicity

Examples

Experimental program
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Embodiment 1

[0297] The raw silica was dried and coated with a silicone oil (eg, DOW CORNING(R) 200 FLUID 50 CS, a methyl-terminated silicone oil with a carbon content of about 33% and a viscosity of 50 mPas) using a spin-flash dryer. The silica was then conditioned (aged for at least 48 hours at room temperature) until it had at least 20% methanol wettability. The analytical data for the modulated silica are shown in Table 1.1.

[0298] Analytical Data for Modulated Silica

water

％

5.2

pH

6.1

Conductivity

μS

41

N 2 surface area

m 2 / g

84

CTAB surface area

m 2 / g

132

Bulk density

g / l

317

Alpine SR>180μm

％

63

Diffuse reflectance

％

95.9

C content

％

4.12

Methanol wettability

％

＞20

[0299] This is followed by heat treatment in a fluidized bed at different oxygen contents. Experimental parameters are shown in Table...

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Abstract

A hydrophobic precipitated silica is prepared by a process comprising: a) preparing a mixture of an organopolysiloxane derivative and a precipitated silica; b) conditioning the mixture obtained at a temperature ranging from 10 to 150 DEG C for a period ranging from 0.5 to 72 h, and c) conducting oxidative heat treatment under fluid conditions at a temperature more than 300 DEG C with an oxidizing gas. Said liquid condition is preferred set among the suspending bed, moving bed, fluidized bed and / or turbulent bed.

Description

technical field [0001] The present invention relates to a process for the preparation of hydrophobic precipitated silicas having extremely low water absorption, high whiteness and at the same time high reinforcement for silicone vulcanizates in silicone rubber articles Has a low thickening effect. Background technique [0002] The treatment of finely divided solids, metal oxides and silicates with organosilicon compounds such as organopolysiloxanes is known, for example from DE 30 85 905 . The heat treatment process involved is carried out under an inert atmosphere of nitrogen. In addition, hydrophobic silicates are known, for example from DE 24 35 860, DE 22 42 728 and DE 25 13 608. [0003] In these documents, hydrophilic silicates and precipitated silicas are hydrophobized by their reaction with organosilicon compounds. Examples of hydrophobizing agents used include organohalosilane or organopolysiloxane compounds. [0004] DE 26 28 975 and DE 27 29 244 describe the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/18C08K3/36C08L83/04C09C1/30
CPCC01P2006/12C09C1/3081C01P2006/82C01P2006/90C01P2006/10C01P2006/40C01P2006/19C01P2006/60C01B33/18C01P2006/11C09C1/3045C01P2006/80
Inventor K·梅尔H·奥布拉登R·施托菲尔斯C·潘茨R·施莫尔
Owner DEGUSSA AG
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