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Method for preparing a synthetic talc composition from a kerolite composition

A composition, serpentine technology, applied in the direction of silicon compounds, chemical instruments and methods, nanotechnology for materials and surface science, etc., can solve problems such as inability to obtain satisfactory quality crystallinity and thermally stable talc compositions

Inactive Publication Date: 2009-08-26
LUZENAC EURO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] Thus, the hydrothermal synthesis described in the 1989 publication by Decarreau et al. does not yield talc compositions of satisfactory quality, especially with regard to crystallinity and thermal stability

Method used

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  • Method for preparing a synthetic talc composition from a kerolite composition
  • Method for preparing a synthetic talc composition from a kerolite composition
  • Method for preparing a synthetic talc composition from a kerolite composition

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Embodiment Construction

[0057] A / -Synthetic Scheme of Synthetic Talc Composition

[0058] According to the present invention, the preparation of the synthetic talc composition comprises anhydrous thermal treatment of the cerolite composition. The anhydrous heat treatment is carried out at low pressure, less than 5 bar (for example at atmospheric pressure), and at a temperature greater than 300°C.

[0059] Although the focus of the present invention is essentially on this anhydrous heat treatment step, the preferred method of preparing the silicometallic gel and the preferred method of processing the gel to obtain the cerolite composition will also be described below. The anhydrous heat treatment according to the invention enables the conversion of cerolite to perfectly crystalline and thermally stable talc. Depending on the characteristics of the starting cerolite and the method used to prepare the cerolite, the particle size of the talc can be determined and adjusted.

[0060] 1 / - Preparation of s...

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Abstract

The invention relates to a method for preparing a synthetic talc composition. According to said method, a kerolite composition is subjected to an anhydrous thermal treatment carried out at a pressure lower than 5 bar, from over a few hours up to over a few days, at a treatment temperature higher than 300 DEG C. The invention also relates to a synthetic talc composition prepared in this way, the synthetic talc particules of the composition being exclusively of chemical formula - (Si4)Mg3O10(OH)2 - and identifiable, during X-ray diffraction, by the presence of a characteristic diffraction peak located at a distance of between 9.40-9.68 AA and corresponding to a plane (001). Said synthetic talc particles also have a thermally stable crystalline structure of stacked laminae, which is very similar to that of a natural talc and has a particle size smaller than approximately ten micrometres.

Description

technical field [0001] The present invention relates to a method for preparing a synthetic talc composition comprising 4 Mg 3 o 10 (OH) 2 thermally stable talc particles. Depending on the specific parameters applied during the performance of the method, the particle size of the synthetic talc particles can vary from a few tens of nanometers to about ten microns, and have a substantially unimodal and monodisperse distribution. Background technique [0002] Natural talc is a mineral - formula Si 4 Mg 3 o 10 (OH) 2 hydrated magnesium silicate, which is arranged in the form of a large number of flakes. [0003] Talc is used in many industrial sectors: for example, thermoplastics, elastomers, paper, paints, finishes, textiles, metallurgy, pharmaceuticals, cosmetics, phytosanitary products, fertilizers, etc., basically in particulate form, in these applications , talc can be used both as an inert filler (for chemical stability, e.g. for diluting active substances, expensi...

Claims

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Application Information

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IPC IPC(8): C01B33/22C01B33/38
CPCC01P2002/82C01P2002/72C01B33/405C01P2004/64C01B33/22C01P2004/62B82Y30/00C09C1/28Y10T428/2982
Inventor F·马丁J·费雷C·莱布尔S·珀蒂O·格罗比J-P·博尼诺D·阿瑟盖A·德卡里奥E·费拉热
Owner LUZENAC EURO
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