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Method for producing zirconia colloids

A technology of zirconia and zirconium oxychloride, applied in zirconia, chemical instruments and methods, colloidal chemistry, etc., can solve problems such as unfavorable economy

Active Publication Date: 2015-11-25
ESSILOR INT CIE GEN DOPTIQUE +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

This step is of course disadvantageous for the economics of the method used to make the hard coat

Method used

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  • Method for producing zirconia colloids
  • Method for producing zirconia colloids
  • Method for producing zirconia colloids

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Embodiment Construction

[0015] As mentioned above, the present invention is directed to a method for producing a colloidal suspension of zirconia particles comprising the following successive steps:

[0016] a) subjecting a mixture of zirconium oxychloride and alkali metal halide in an aqueous solvent to a hydrothermal treatment at a temperature above 150° C. in order to obtain a suspension in the form of a two-phase mixture comprising a A seed slurry and a supernatant, and

[0017] b) Desalting the suspension without first peptizing it to form a colloidal suspension of zirconia.

[0018] In the first step of the method, zirconium oxychloride is used as a zirconium precursor. As shown in the examples below, experiments have shown that this precursor results in better dispersed zirconia than when other sources of zirconium, such as zirconium nitrate, are used. Zirconium oxychloride is blended with a mineralizer, an alkali metal halide. The choice of this mineralizer is also critical, as experiments...

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Abstract

The present invention pertains to a method for producing a colloidal suspension of zirconia particles, comprising the following successive steps: a) subjecting a mixture of zirconium oxychloride and an alkali metal halide in an aqueous solvent to hydrothermal treatment at a temperature above 150° C., so as to obtain a suspension in the form of a two-phase mixture comprising a slurry and a supernatant, b) without first peptizing it, desalting said suspension so as to form a colloidal suspension of zirconia.

Description

field of invention [0001] The present invention relates to a process for producing a colloidal suspension of zirconia particles intended to be included in a coating composition for the manufacture of optical articles such as ophthalmic lenses. Background of the invention [0002] It is well known in the field of eyepieces to use inorganic colloids in scratch-resistant and / or abrasion-resistant coatings (also referred to as "hard coatings") for improving the surface properties of organic glasses and / or modifying their refractive index. These colloids are also used in anti-reflective coatings and in impact-resistant primers. [0003] Zirconia, or zirconium dioxide, is one of these known colloids because it offers a number of useful mechanical and physical properties, including high fracture toughness, mechanical strength and hardness, low thermal conductivity, high refractive index and Transparency in the visible and infrared spectral region. However, it may be difficult to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G25/02B01J13/00C09C1/00
CPCB01J13/0047C01G25/02C01P2002/60C01P2002/72C01P2002/82C01P2002/85
Inventor 施利毅S·珀盖X·潘乔特Y·勒克莱尔袁帅王竹仪赵尹赵健
Owner ESSILOR INT CIE GEN DOPTIQUE
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