Surface-modified non-metal/metal oxides coated with silicon dioxide

A surface modification, silicon dioxide technology, applied in the treatment of dyed organosilicon compounds, nanotechnology for materials and surface science, titanium compounds, etc., can solve difficult particle addition, low surface functionality intergrowth, limitations Stability and other issues

Inactive Publication Date: 2007-02-14
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, a disadvantage of this approach is that these coated metal oxide particles exhibit low surface functionality and a high degree of intergrowth of the particles, which makes it more difficult to incorporate these particles

Method used

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  • Surface-modified non-metal/metal oxides coated with silicon dioxide
  • Surface-modified non-metal/metal oxides coated with silicon dioxide
  • Surface-modified non-metal/metal oxides coated with silicon dioxide

Examples

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Example Embodiment

[0160] In the preparation method of the oxide particles used according to the present invention, a base dissolved in water is added to the dispersion under stirring, and the dispersion includes 1-80% by weight of metal oxide, at least one X n Si(OR) 4-n Type compound and water; where X n Si(OR) 4-n The molar ratio of / metal oxide is between 0.1-25 and depends on the film thickness of the silica shell; the reaction product is separated; rinsing is optionally performed; and drying is performed.

[0161] As X n Si(OR) 4-n Type compounds are preferably used as follows: X = halogen or H, R = H or a linear or branched alkyl group with 1-8 carbon atoms, n = 0-4, and if n = 4, R is not equal to H . Particularly preferred is tetraalkoxysilane and / or its oligomer.

[0162] The reaction product can be separated by filtration or centrifugation. It can be washed with water, an organic solvent, or a mixture of water and organic solvent, and water is preferred in the present invention.

[0163] ...

Example Embodiment

[0194] Example 1:

[0195] 100 g of titanium dioxide (P25, available from Degussa) prepared by flame hydrolysis pyrolysis was dispersed in one liter of water. 100 ml of tetraethoxysilane was added to the solution. The mixture was stirred for 15 minutes, and then 30 ml of ammonia was added. After stirring for 2-4 hours at 25°C, the product was filtered and dried.

Example Embodiment

[0196] Example 2:

[0197] 100 g of titanium dioxide (P25, available from Degussa) prepared by flame hydrolysis pyrolysis was dispersed in one liter of water. 200 ml of tetraethoxysilane was added to the solution. The mixture was stirred for 15 minutes, and then 30 ml of ammonia was added. After stirring for 2-4 hours at 25°C, the product was filtered and dried.

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Abstract

The present invention provides surface-modified silica-coated metal oxide particles having low structure and prepared by adding, with stirring, a base dissolved in water to a dispersion comprising Metal oxide, at least one XnSi(OR) 4-n type compound and water; separation; optionally rinsing with water; drying; and surface modification of the reaction product. The surface-modified silica-coated metal oxide particles can be used in sunscreen and CMP applications.

Description

technical field [0001] The present invention relates to surface-modified silica-coated non-metal / metal oxides, their preparation and their use. Background technique [0002] Metal oxides, such as titanium dioxide or zinc oxide, are widely used in sunscreens. Their action is essentially based on reflecting, scattering and absorbing harmful UV radiation and depends mainly on the primary particle size of the metal oxides. [0003] Metal oxides, such as titanium dioxide or zinc oxide, exhibit photocatalytic activity. [0004] A known method of reducing photocatalytic activity is the preparation of silica-coated metal oxide particles, which can be used as a component of sunscreens. [0005] However, a disadvantage of this approach is that these coated metal oxide particles exhibit low surface functionality and a high degree of intergrowth of the particles, which makes it more difficult to incorporate these particles into cosmetic formulations , their stabi...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/06C09K3/14C01G9/00C01G23/00C01G25/00C01G49/00A61K8/11A61K8/25A61K8/29A61Q17/04C09C1/04C09C1/40C09C3/12
CPCC09C1/3684A61K8/25A61K8/29C01P2006/14C09C1/40C01P2004/64C01P2006/12C09C1/3661A61Q17/04C09C3/063C09C1/043A61K2800/412B82Y30/00Y10T428/2993C01P2006/19C09C3/12A61K8/11A61K8/02
Inventor 于尔根·迈尔斯特芬·哈森察尔凯·舒马赫
Owner EVONIK DEGUSSA GMBH
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