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Surface-modified silicas

A surface modification, silicon dioxide technology, applied in the direction of silicon dioxide, silicon oxide, nanotechnology for materials and surface science, etc., can solve the problem of light transmittance without quality

Active Publication Date: 2011-09-14
EVONIK OPERATIONS GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] A disadvantage of these known LSR silicone rubber compositions is that they do not have the required qualities in terms of light transmission

Method used

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  • Surface-modified silicas
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Experimental program
Comparison scheme
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Embodiment

[0179] The preparation of the embodiment of the invention

[0180] Charge 2.5kg of fumed silica in the mixer 300, which has the characteristic data stated in the description, and under vigorous mixing, the silica is first sprayed with 0.125 kg of potassium chloride aqueous solution (containing 1.58 g of KCl), followed by 0.45 kg of hexamethyldi Silazane spray. After the spraying had ended, mixing was continued for 15 minutes and then heat treated at 25° C. for 5 hours and then at 140° C. for 2 hours.

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Abstract

The invention relates to surface-modified fumed silica, particularlly relates to surface-modified fumed silica prepared by subjecting a fumed silica to surface modification in the presence of potassiuThe invention relates to surface-modified fumed silica, particularlly relates to surface-modified fumed silica prepared by subjecting a fumed silica to surface modification in the presence of potassium compounds, having the data: BET surface area, m<2> / g: 25 - 400; Average primary particle size, nm: 5 - 50; pH: 3 - 10; Carbon content, % by weight: 0.1 - 10; Potassium content calculated as potassium compounds, having the data: BET surface area, m<2> / g: 25 - 400; Average primary particle size, nm: 5 - 50; pH: 3 - 10; Carbon content, % by weight: 0.1 - 10; Potassium content calculated as potassium oxide), % by weight: 0.000001 - 40; It can be used in LSR silicone rubber compositions as a filler.m oxide), % by weight: 0.000001 - 40; It can be used in LSR silicone rubber compositions as a filler.

Description

technical field [0001] The present invention relates to surface-modified silicas, a process for their preparation and their use as fillers in silicone rubber compositions. Background technique [0002] The preparation of LSR silicone rubbers comprising potassium-doped fumed silica fillers by aerosolization is known (WO 2004 / 033564 A1). [0003] A disadvantage of these known LSR silicone rubber compositions is that they do not have the required qualities with regard to light transmission. [0004] It was therefore an object of the present invention to develop a filler for silicone rubber compositions so as to prevent these disadvantages. Contents of the invention [0005] The present invention provides surface-modified fumed silica characterized by the following characteristic physicochemical data: [0006] BET surface area, m2 / g: 25-400 [0007] Average primary particle size, nanometers: 5-50 [0008] pH: 3-10 [0009] Carbon content, % by weight: 0.1-10 [0010] Pot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/18C08K9/02C09C1/30C09C1/68
CPCC01P2006/12C09C1/3081C01P2004/64C01P2006/22C01P2006/40C01P2004/62C08L83/04B82Y30/00Y10T428/2982C08L2666/54
Inventor J·迈尔M·肖尔茨
Owner EVONIK OPERATIONS GMBH