Gypsum panels, systems, and methods

Patent metadata

Field	Value
Publication number	US-11608637-B2
Application number	US-202016851723-A
Country	US
Kind code	B2
Filing date	Apr 17, 2020
Priority date	Feb 3, 2015
Publication date	Mar 21, 2023
Grant date	Mar 21, 2023

Abstract

Gypsum panels and methods for their manufacture are provided herein. The gypsum panels include a gypsum core having a first surface and a second opposed surface and a first fiberglass mat associated with the first surface of the gypsum core, such that gypsum from the gypsum core penetrates at least a portion of the first fiberglass mat.

First claim

What is claimed is:

1. A method of making a gypsum panel, comprising:
depositing an aqueous polymeric or inorganic binder onto a first surface of a first fiberglass mat, the binder comprising a wetting agent in an amount effective to reduce a wet surface tension of the binder to below 65 dyne/cm;
depositing a gypsum slurry onto the first surface of the first fiberglass mat unto which the binder has been deposited, such that the gypsum slurry penetrates from 5 percent to 20 percent of a thickness of the first fiberglass mat; and
allowing the gypsum slurry to set to form a gypsum core.

2. The method of claim 1 , wherein the binder comprises the wetting agent in an amount effective to bring the wet surface tension of the binder to from about 30 dyne/cm to about 60 dyne/cm.

3. The method of claim 1 , wherein the wetting agent comprises a surfactant having, at standard atmospheric pressure, a boiling point equal to or less than 200° C.

4. The method of claim 3 , wherein the surfactant is present in the coating in an amount of about 0.01 percent to about 0.5 percent, by weight.

5. The method of claim 1 , wherein the binder comprises a latex binder.

6. The method of claim 1 , wherein the binder comprises at least one of styrene-butadiene-rubber (SBR), styrene-butadiene-styrene (SBS), ethylene-vinyl-chloride (EVCl), poly-vinylidene-chloride (PVdCl) and poly(vinylidene) copolymers, modified poly-vinyl-chloride (PVC), poly-vinyl-alcohol (PVOH), ethylene-vinyl-acetate (EVA), poly-vinyl-acetate (PVA) and
polymers and copolymers containing units of acrylic acid, methacrylic acid, their esters and derivatives thereof (acrylic-type polymers).

7. The method of claim 1 , wherein the binder is deposited onto the first surface of the first fiberglass mat in an amount of from about 0.00044 lb/ft 2 to about 0.011 lb/ft 2 , on a dry basis.

8. The method of claim 1 , further comprising applying a continuous barrier coating to a second surface of the first fiberglass mat opposite the gypsum core, the continuous barrier coating penetrating a portion of the first fiberglass mat, to define a remaining portion of the first fiberglass mat, wherein gypsum from the gypsum core penetrates the remaining portion of the first fiberglass mat such that voids in the first fiberglass mat are substantially eliminated.

9. The method of claim 1 , wherein the depositing the binder comprises at least one of spraying, curtain coating, rolling, or brushing a coating comprising the binder onto the first surface of the first fiberglass mat.

10. The method of claim 1 , comprising vacuuming excess binder from the first fiberglass mat after depositing the binder thereon.

11. The method of claim 1 , comprising curing the binder prior to depositing the gypsum slurry onto the first surface of the first fiberglass mat.

12. The method of claim 1 , comprising mechanically vibrating at least the first fiberglass mat having the first gypsum slurry deposited thereon to effect penetration of the gypsum slurry into the remaining fibrous portion of the first fiberglass mat.

Assignees

• Georgia Pacific Gypsum Llc

Inventors

• Teng Yi-Hsien Harry
• Tricker Andrew W
• Thomas Vincent B
• Bradford Rochelle
• Sanders Christopher J

Classifications

• C03C25/1025

  to obtain fibres used for reinforcing cement-based products · CPC title

• E04C2/043

  of plaster (E04C2/049 takes precedence) · CPC title

• C04B28/145

  Calcium sulfate hemi-hydrate with a specific crystal form · CPC title

• C03C25/00

  Surface treatment of fibres or filaments made from glass, minerals or slags · CPC title

• E04C2/06 Primary

  reinforced · CPC title