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Dry method for surface treatment

A dry and versatile technology, applied in the field of processing solids, can solve the problems of limited solubility, less glass corrosion, and low safety

Inactive Publication Date: 2012-05-16
AGC GLASS EUROPE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Unfortunately, there are limitations to the solution suggested by the state of the art
On the other hand, the use of etching solutions is limited to the solubility of alkali compounds in aqueous solutions of lower alcohols, resulting in less intensive glass corrosion
Furthermore, the use of lower alcohols entails serious safety concerns (low flash point, explosion, fire, inventory) for application in industrial production lines

Method used

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  • Dry method for surface treatment
  • Dry method for surface treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0047] NaOH powder (obtained by pulverization of NaOH pellets) was applied to a 2 mm thick float glass sample at room temperature, followed by placing the sample in a preheated oven at a temperature of approximately 400-440° C. ( Opening the oven allows for less precise temperature control). After 5 minutes, the hot glass sample with molten NaOH on top was removed from the oven and left to cool slowly to room temperature with crystallization of the reaction product crust. Afterwards, the skin was removed from the glass samples by water. The resulting float glass samples showed a clearly textured surface with a hazy appearance and the following roughness parameters: Rz = 8.3 μm, RSm = 266.5 μm, Ra = 1.6 μm (Ra is the peak value and Roughness average of the valley distance. RSm is the arithmetic mean of the width of the roughness distribution elements within the length of the sample. Rz is the roughness average of the five highest peaks and five lowest valleys measured in a sec...

Embodiment 2

[0049] NaOH powder (obtained by powdering NaOH pellets) was applied to float glass samples of 2 mm thickness at room temperature, and the samples were then placed in a preheated oven at a temperature of approximately 400-440° C. for 15 minutes ( Opening the oven allows for less precise temperature control). After 15 minutes, the hot glass sample with molten NaOH on top was removed from the oven and left to cool slowly to room temperature with crystallization of the reaction product crust. Afterwards, the skin was removed from the glass samples by water. The resulting float glass samples showed a clearly textured surface with a hazy appearance and the following roughness parameters: Rz = 9.8 μm, RSm = 539.3 μm, Ra = 2.2 μm. Comparing these with the samples above clearly shows that the reaction time plays an important role and can be used to adjust the desired textured surface.

Embodiment 3

[0051] NaOH pellets were applied to float glass samples of 2mm thickness at room temperature, and the samples were then placed in a preheated oven at a temperature of approximately 455°C (opening the oven for less precise temperature control) for 15 minutes. After 15 minutes, the hot glass sample with molten NaOH on top was removed from the oven and left to cool slowly to room temperature with crystallization of the reaction product crust. Afterwards, the skin was removed from the glass samples by water. The resulting float glass samples exhibited a clearly textured surface with a hazy appearance.

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Abstract

The present invention discloses a method for treating at least a portion of at least one surface of a glass article which comprises the following steps, whatever their order: dry application of at least one high-pH solid material on said portion; heating of said glass article to a temperature at least equal to the melting temperature of the said high-pH solid.

Description

technical field [0001] The present invention relates to methods of treating solid objects, particularly glass objects, to produce textured, eg matte, opaque or frosted appearances on their surfaces. Background technique [0002] Etched matting of glass (especially glass panels) is usually performed by treating the glass surface with hydrofluoric acid vapor or an etching liquid containing hydrofluoric acid (HF). Unfortunately, due to the high toxicity of HF, the treatment of glass surfaces can be a dangerous and messy operation. [0003] Efforts to avoid the use of hydrofluoric acid have progressed. For example, document GB1299531 discloses a method using an alkaline solution in a mixture of lower alcohol and water. R.F. Bartholomew, Journal of the Electrochemical Society, Vol. 112, N° 11, pp. 1120-1123, 1965, discloses glass erosion due to the formation of a frost pattern with baths of molten hydroxides. [0004] Unfortunately, there are limitations to this solution sugge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C15/00
CPCC03C15/00
Inventor R·皮埃特斯F·斯加索
Owner AGC GLASS EUROPE SA
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