Gypsum panels, methods, and systems

Patent metadata

Field	Value
Publication number	US-10427979-B2
Application number	US-201816047108-A
Country	US
Kind code	B2
Filing date	Jul 27, 2018
Priority date	Mar 5, 2018
Publication date	Oct 1, 2019
Grant date	Oct 1, 2019

Abstract

Gypsum panels and methods of making gypsum panels are provided. A method of making a gypsum panel includes combining gypsum stucco and a halide salt sequestration agent with water to form a gypsum slurry and setting the gypsum slurry to form at least a portion of a gypsum core, wherein the halide salt sequestration agent is present in an amount effective to sequester at least a portion of halide salt present in the gypsum stucco. A gypsum panel includes a gypsum core that comprises set gypsum and a halide salt sequestration agent, wherein the halide sequestration agent sequesters at least a portion of halide salt present in the gypsum core.

First claim

What is claimed is:

1. A method of making a gypsum panel, comprising:
combining gypsum stucco and a halide salt sequestration agent with water to form a gypsum slurry; and
setting the gypsum slurry to form at least a portion of a gypsum core,
wherein the halide salt sequestration agent is present in an amount effective to sequester at least 25 percent, by weight, of halide salt present in the gypsum stucco.

2. The method of claim 1 , wherein the halide salt sequestration agent comprises alumina or perlite.

3. The method of claim 1 , wherein the halide salt sequestration agent comprises activated alumina present in an amount of from about 0.01 to about 10 weight percent, by weight of the gypsum stucco.

4. The method of claim 3 , wherein the activated alumina has an average particle size of less than 1 mm.

5. The method of claim 1 , wherein the halide sequestration agent comprises perlite present in an amount in an amount of from about 0.01 to about 10 weight percent, by weight of the gypsum stucco.

6. The method of claim 5 , wherein the perlite is perlite ore having an average particle size smaller than 30 mesh.

7. The method of claim 5 , wherein the perlite is expanded perlite having an average particle size smaller than 16 mesh.

8. The method of claim 1 , further comprising heating the halide sequestration agent prior to combining the halide sequestration agent with the gypsum stucco, wherein the heating is effective to expand or activate at least a portion of the halide sequestration agent.

9. The method of claim 1 , further comprising associating a facer material with the gypsum slurry or the gypsum core.

10. The method of claim 9 , wherein:
the facer material comprises a paper facer material, and
the gypsum panel displays a paper facer to core humid bond strength of at least about 12 lbs/f.

11. The method of claim 1 , wherein the gypsum stucco comprises gypsum obtained from a natural source or from a flue gas desulfurization process.

12. A gypsum panel, comprising:
a gypsum core that comprises set gypsum and a halide salt sequestration agent;
wherein the halide sequestration agent is present in an amount effective to sequester at least 25 percent, by weight, of halide salt present in the gypsum core.

13. The gypsum panel of claim 12 , wherein the halide salt sequestration agent comprises alumina or perlite.

14. The gypsum panel of claim 12 , wherein the halide salt sequestration agent comprises activated alumina present in an amount of from about 0.01 to about 10 weight percent, by weight of the set gypsum.

15. The gypsum panel of claim 14 , wherein the activated alumina has an average particle size of less than 1 mm.

16. The gypsum panel of claim 12 , wherein the halide sequestration agent comprises perlite present in an amount in an amount of from about 0.01 to about 10 weight percent, by weight of the gypsum stucco.

17. The gypsum panel of claim 16 , wherein the perlite is perlite ore having an average particle size smaller than 30 mesh.

18. The gypsum panel of claim 16 , wherein the perlite is expanded perlite having an average particle size smaller than 16 mesh.

19. The gypsum panel of claim 12 , further comprising a facer material associated with the gypsum core.

20. The gypsum panel of claim 19 , wherein:
the facer material comprises a paper facer material, and
the gypsum panel displays a paper facer to core humid bond strength of at least about 12 lbs/f.

Assignees

• Georgia Pacific Gypsum Llc

Inventors

• Harrison Charles R
• Gilley Stuart Brandon

Classifications

• B32B13/08

  of paper or cardboard · CPC title

• C04B14/18

  Perlite · CPC title

• C04B2103/0078

  Sorbent materials · CPC title

• C04B14/303

  Alumina · CPC title

• C04B2111/0062

  Gypsum-paper board like materials · CPC title