Process for producing and processing a paste-like SiO2 composition, and the use thereof

Patent metadata

Field	Value
Publication number	US-9533890-B2
Application number	US-201314383526-A
Country	US
Kind code	B2
Filing date	Mar 7, 2013
Priority date	Mar 9, 2012
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

The invention relates to a process for producing a paste-like SiO 2 composition using an SiO 2 slip which allows simple intermediate storage and transport conditions without the processability of the slip to give the paste-like SiO 2 composition being impaired thereby. According to the invention, it is for this purpose proposed that a homogeneous SiO 2 base slip be subjected to a drying step to form a dry SiO 2 composition and subsequently be processed further by means of a remoistening step to give the paste-like SiO 2 composition, where the remoistening step comprises the addition of liquid to the dry SiO 2 composition to form a paste-like kneadable SiO 2 composition having a solids content of more than 85% by weight. The invention further relates to the use of a paste-like SiO 2 composition as repair composition.

First claim

The invention claimed is:

1. A process for producing a paste-like SiO 2 composition, said process comprising:
providing a homogenized SiO 2 base slip with a solids content of SiO 2 particles in a range of 80% by wt. to 90% by wt.,
subjecting the SiO 2 base slip to a drying step so as to form a dry SiO 2 composition, and
remoistening the dry SiO 2 composition so as to yield the paste-like SiO 2 composition,
wherein the remoistening comprises adding liquid to the dry SiO 2 composition so as to form the paste-like SiO 2 composition, wherein the paste-like SiO 2 composition has a solids content of more than 85% by weight; and
wherein the remoistening comprises dripping or pouring liquid onto the dry SiO 2 composition and distributing the liquid in the dry SiO 2 composition by kneading.

2. The process according to claim 1 , wherein the SiO 2 base slip is an aqueous and/or alcoholic suspension.

3. The process according to claim 1 wherein the SiO 2 base slip has a solids content of 85% by wt. to 88% by wt.

4. The process according to claim 1 , wherein the SiO 2 base slip comprises a SiO 2 sol that is adjusted by adding SiO 2 particles to have a solids content in a range of 80% by wt. to 90% by wt.

5. The process according to claim 1 , wherein the SiO 2 base slip is homogenized in a vacuum kneader.

6. The process according to claim 1 , wherein the drying step comprises pouring the SiO 2 base slip, with the SiO 2 base slip having a drying rate in a range of 3% to 10% weight loss per minute.

7. The process according to claim 1 , wherein the drying step takes place at temperatures in a range of 20° C. to 120° C.

8. The process according to claim 1 , wherein the drying step is carried out at room temperature for at least 12 hours.

9. The process according claim 1 , wherein the dry SiO 2 composition is comminuted in an at least one comminuting step prior to the remoistening.

10. The process according to claim 1 , wherein the remoistening is carried out by adding liquid in the form of water or alcohol or a mixture of water and alcohol onto the dry SiO 2 composition.

11. The process according to claim 1 , wherein the kneading comprises manual kneading.

12. A process for repairing an article, said process comprising:
producing a paste-like SiO 2 composition according to the process according to claim 1 , and
applying the paste-like SiO2 composition to the article as a repair composition.

Assignees

• Heraeus Quarzglas

Inventors

• Weber Jürgen
• Traeger Norbert
• Scheich Gerrit
• Werdecker Waltraud
• Schenk Christian
• Peekhaus Joachim
• Meyer-Merget Kerstin
• Pankalla Sebastian

Classifications

• B05D2203/35

  Glass · CPC title

• C03C2205/00

  Compositions applicable for the manufacture of vitreous enamels or glazes · CPC title

• C01P2004/64

  Nanometer sized, i.e. from 1-100 nanometer · CPC title

• B05D5/005

  Repairing damaged coatings · CPC title

• C01B33/1417 Primary

  an aqueous dispersion being obtained · CPC title