THERMALLY INSULATING GLASS FOR OVENS AND PREPARATION METHOD THEREOF

Abstract

A thermally insulating glass for ovens includes a glass substrate, a thermally insulating layer and a protective layer. The glass substrate has an inner and outer surfaces, and the inner or/and outer surfaces are coated with the thermally insulating layer made of silver. The protective layer made of silicone oil is coated on the thermally insulating layer for protecting the thermally insulating layer from being oxidized. Silver can greatly enhance thermally insulating performance and reduce heat dissipation and energy consumption. Based on the high temperature resistance, protective properties and transparency of the silicone oil layer, the protective layer prevents the thermally insulating layer from being oxidized, and the work status can be observed. The process of preparing the thermally insulating glass is simple and the cost is low.

Claims

1. A thermally insulating glass for ovens, comprising: a glass substrate comprising an inner surface and an outer surface; a thermally insulating layer made of silver and provided on the inner surface or/and an outer surface; and a protective layer made of silicone oil and provided on the thermally insulating layer for preventing the thermally insulating layer from being oxidized.

2. The thermally insulating glass for ovens according to claim 1, wherein the silicone oil is methyl silicone oil or modified silicone oil.

3. The thermally insulating glass for ovens according to claim 2, wherein the modified silicone oil is any one selected from groups of alcoholic hydroxyl-modified silicone oil, alkyl-modified silicone oil, polyether-modified silicone oil, epoxy-modified polysiloxane and amino-modified silicone oil.

4. The thermally insulating glass for ovens according to claim 1, wherein the thickness of the protective layer is 20-50 m.

5. A method of preparing a thermally insulating glass for ovens, the method comprising: step a, providing a glass substrate comprising an inner surface and an outer surface; step b, coating a thermally insulating layer made of silver on the inner surface and/or the outer surface of the glass substrate; and step c, coating a protective layer made of silicone oil on the thermally insulating layer.

6. The method of preparing a thermally insulating glass for ovens according to claim 5, wherein the step b further comprises placing the glass substrate in a first vacuum chamber for magnetron sputter coating, with target material being silver; then coating the target material on the inner surface and/or the outer surface of the glass substrate to form the thermally insulating layer at 100 C.-250 C.

7. The method of preparing a thermally insulating glass for ovens according to claim 5, before the step c, further comprising cooling down gradually to a room temperature.

8. The method of preparing a thermally insulating glass for ovens according to claim 7, wherein the step c further comprises moving the glass substrate to a second vacuum chamber filled with an inert gas; then coating silicone oil on the thermally insulating layer to form the protective layer.

9. The method of preparing a thermally insulating glass for ovens according to claim 5, after the step c, further comprising depressurizing gradually the glass substrate to obtain the thermally insulating glass for ovens.

10. The method of preparing a thermally insulating glass for ovens according to claim 5, between the steps a and b, further comprising cleaning and drying the glass substrate.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings facilitate an understanding of the various embodiments of this invention. In such drawings:

[0021] FIG. 1 is a schematic view of a thermally insulating glass for ovens according to one embodiment of the present invention; and

[0022] FIG. 2 is a schematic view of a thermally insulating glass for ovens according to another embodiment of the present invention.

DETAILED DESCRIPTION OF ILLUSTRATED EMBODIMENTS

[0023] The present invention will be described with reference to the accompanying drawings, in which like reference numerals refer to similar elements.

[0024] In embodiment 1, as shown in FIG. 1, the thermally insulating glass for ovens 100 includes a glass substrate 10, a thermally insulating layer 20 and a protective layer 30. The glass substrate 10 has an inner surface and an outer surface, and the outer surface is coated with the thermally insulating layer 20 made of silver. The protective layer 30 made of methyl silicone oil is coated on the thermally insulating layer 20 for protecting the thermally insulating layer 20 from being oxidized. Thickness of the protective layer 30 is 20 m.

[0025] In embodiment 2, as shown in FIG. 1, the thermally insulating glass for ovens 100 includes a glass substrate 10, a thermally insulating layer 20 and a protective layer 30. The glass substrate 10 has an inner surface and an outer surface, and the inner surface is coated with the thermally insulating layer 20 made of silver. The protective layer 30 made of methyl silicone oil is coated on the thermally insulating layer 20 for protecting the thermally insulating layer 20 from being oxidized. Thickness of the protective layer 30 is 30 m. Since heat in the ovens diffuse from inside to outside, the thermally insulating layer 20 is disposed on the inner surface of the glass substrate 10, so as to effectively prevent heat from diffusing.

[0026] In embodiment 3, as shown in FIG. 1, the thermally insulating glass for ovens 100 includes a glass substrate 10, a thermally insulating layer 20 and a protective layer 30. The glass substrate 10 has an inner surface and an outer surface, and the outer surface is coated with the thermally insulating layer 20 made of silver. The protective layer 30 made of epoxy modified polysiloxane is coated on the thermally insulating layer 20 for protecting thermally insulating layer 20 from being oxidized. Thickness of the protective layer 30 is 20 m. As epoxy-modified polysiloxane is organosilicon materials polymerized by polymethylsiloxane and epoxyalkane with characteristics of polymethylsiloxane and epoxyalkane. Compared with the protective layer 30 formed by methyl silicone oil, the surface tension of the protective layer 30 formed by epoxy-modified polysiloxane is low, so the problems referring to embrittlement and cracking can be solved. Based on ageing-resistant performance of the protective layer 30 formed by epoxy-modified polysiloxane, service life of the protective layer 30 is longer.

[0027] In embodiment 4, as shown in FIG. 1, the thermally insulating glass for ovens 100 includes a glass substrate 10, a thermally insulating layer 20 and a protective layer 30. The glass substrate 10 has an inner surface and an outer surface, and the outer surface is coated with the thermally insulating layer 20 made of silver. The protective layer 30 made of alcoholic hydroxyl-modified silicone oil is coated on the thermally insulating layer 20 for protecting thermally insulating layer 20 from being oxidized. Thickness of the protective layer 30 is 20 m. Alcoholic hydroxyl-modified silicone oil is terminated with alcoholic hydroxyl group or has alcoholic hydroxyl group in the main chain, so alcoholic hydroxyl-modified silicone oil has reactivity. Crosslink will be generated when alcoholic hydroxyl-modified silicone oil suffering from heating, thereby enhancing tear strength, abrasion resistance and heat resistance properties of the protective layer 30 made of alcoholic hydroxyl-modified silicone oil. Such a protective layer can achieve higher density compared with the protective layer 30 made of other modified silicone oil and has wider applicability on anti-oxidation. For example, if a product is required to be heated to higher temperature, such a protective layer made of alcoholic hydroxyl-modified silicone oil is desirable to be coated thereon.

[0028] In embodiment 5, as shown in FIG. 2, the thermally insulating glass for ovens 100a includes a glass substrate 10, a thermally insulating layer 20 and a protective layer 30. The glass substrate 10 has an inner surface and an outer surface, and both outer and inner surface is coated with the thermally insulating layer 20 made of silver to strengthen thermally insulating performance of thermally insulating glass for ovens 100a. The protective layer 30 made of methyl silicone oil is coated on the thermally insulating layer 20 for protecting thermally insulating layer 20 from being oxidized. Thickness of the protective layer 30 is 50 m.

[0029] In embodiment 6, a exemplary detailed method of preparing the thermally insulating glass for ovens 100, but not limited to 100, the method includes the steps of:

[0030] step a, providing a glass substrate 10;

[0031] step b, placing the glass substrate 10 in a first vacuum chamber filled with an inert gas for magnetron sputter coating, with target material being silver; then coating silver on the outer surface of the glass substrate 10 to form the a thermally insulating layer 20 at 100 C.; the inert gas can be argon gas, but not limited to it;

[0032] step c, placing the glass substrate 10 in multiple vacuums chambers to be gradually cooled down after the thermally insulating layer 20 is coated; then moving the glass substrate 10 to a second vacuum chamber filled with an inert gas; coating silicone oil on the thermally insulating layer 20 to the protective layer 30 at room temperature; the inert gas can be argon gas, but not limited to it; and

[0033] step d, gradually depressurizing in multiple vacuum chambers after the protective layer 30 is coated; lowering pressure from 10.sup.3 Pa to 10.sup.2 Pa, then to 10.sup.1 Pa, but not limited to it.

[0034] In embodiment 7, before the step b, the glass substrate 10 is pretreated to increase binding force of the thermally insulating layer 20 and the glass substrate 10. Concretely, the glass substrate 10 is cleaned and dried before the step b.

[0035] In embodiment 8, the step b further includes placing the glass substrate 10 in a first vacuum chamber filled with an inert gas for magnetron sputter coating, then coating silver on the outer surface of the glass substrate 10 to form the thermally insulating layer 20 at 250 C. or 150 C. The inert gas can be argon gas, but not limited to it.

[0036] In comparative embodiment 1, temperature for preparing the thermally insulating layer 20 was directly reduced from 250 C. to room temperature. While in embodiment 8, temperature for preparing the thermally insulating layer was changed to 250 C. through multiple vacuum chambers and gradually lowered to room temperature. For example, the temperature is reduced from 250 C. to 200 C., then from 200 C. to 150 C., then from 150 C. to 100 C., then from 100 C. to 50 C. and finally to 50 C. Comparing the two embodiments, crack appears in the thermally insulating layer 20 treated by direct cooling, and its thermally insulating performance is poor. And the thermally insulating performance treated by gradual lowering temperature process is excellent.

[0037] While the invention has been described in connection with what are presently considered to be the most practical and preferred embodiments, it is to be understood that the invention is not to be limited to the disclosed embodiments, but on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention.