Method and structure for improved insulation and filler materials

Patent metadata

Field	Value
Publication number	US-11280441-B2
Application number	US-201716758605-A
Country	US
Kind code	B2
Filing date	Dec 18, 2017
Priority date	Dec 18, 2017
Publication date	Mar 22, 2022
Grant date	Mar 22, 2022

Abstract

The disclosure provides for a method for preparing a vacuum insulated panel. The method comprises forming an internal cavity between a liner and a wrapper and preparing filler material to be disposed in the internal cavity. The filler material comprises a first part and a second part. Preparing the filler material comprises treating a surface of the first part, wherein the treating prepares the surface to receive a coating comprising a first charge. The preparing further comprises coating the surface of the first part with a chemical comprising a first charge. The coating forms a first surface charge on the surface of the first part. The method further comprises mixing the first part with the second part forming the filler material. The second part comprises a material having a second surface charge opposite the first surface charge.

First claim

What is claimed is:

1. A vacuum insulated panel comprising:
a liner and a wrapper connected together forming an internal space; and
a filler material disposed in the internal space, the filler material comprising a first part and a second part, wherein the first part is coated in a positively charged coating providing a positive surface charge and the second part comprises a negative surface charge, and wherein the first part and the second part are mixed forming a homogeneous mixture of the filler material, the homogeneous mixture disposed in the internal space.

2. The panel according to claim 1 , wherein air is evacuated from the internal space thereby compacting the filler material.

3. The panel according to claim 1 , wherein each of the first part and the second part comprise a porous filler material.

4. The panel according to claim 1 , wherein the first part is an inorganic material.

5. The panel according to claim 1 , wherein the positively charged coating comprises a silane.

6. The panel according to claim 1 , wherein the first part comprises glass bubbles.

7. The panel according to claim 6 , wherein the second part comprises a fumed silica.

8. The panel according to claim 7 , wherein the glass bubbles are hydrolyzed and coated with a 3-amino-propyltriethoxy silane providing the positive surface charge.

9. A vacuum insulated panel comprising:
a liner and a wrapper connected together forming an internal space; and
a filler material disposed in the internal space, the filler material comprising a plurality of glass spheres and a fumed silica, wherein the glass spheres are coated in a positively charged coating having a positive surface charge and the fumed silica comprises a negative surface charge, wherein the glass spheres and the fumed silica are mixed forming a homogeneous mixture disposed in the internal space, and wherein air in the internal space is evacuated compacting the filler material.

10. The panel according to claim 9 , wherein the positively charged coating comprises a silane material applied to the surface of the glass spheres.

11. The panel according to claim 10 , wherein the surface of the glass spheres is hydrolyzed in an acid bath providing for a bond between hydroxide and the silane material.

Assignees

• Whirlpool Co

Inventors

• Nigam Ashish
• Raskar Devidas B

Classifications

• F25D2201/14

  using subatmospheric pressure · CPC title

• F25D23/063

  formed by an assembly of panels · CPC title

• F25D23/062

  defining a cabinet · CPC title

• C04B2111/28

  Fire resistance, i.e. materials resistant to accidental fires or high temperatures · CPC title

• C04B2111/00612

  as one or more layers of a layered structure · CPC title