Anti-sagging gypsum product and a method to manufacture

Patent metadata

Field	Value
Publication number	US-10793472-B2
Application number	US-201214379730-A
Country	US
Kind code	B2
Filing date	Dec 3, 2012
Priority date	Dec 3, 2012
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

The present invention provides a composition, a gypsum board and their preparation method and the use of ascorbic acid as an anti-sagging additive in a gypsum board. Said gypsum board comprises set gypsum prepared from the composition; while said composition comprises hemi-hydrate gypsum, water and a compound comprising

group and no carboxylate groups. The set gypsum prepared from the said composition shows better anti-sagging or deformation resisting property. The gypsum board of the present invention is hardly distorted and has stronger stability even in the condition of high humidity, thus improve the quality of the gypsum board to meet the demands of the customer.

First claim

What is claimed is:

1. A gypsum board composition, comprising:
gypsum, starch, and an anti-deformation additive,
wherein the anti-deformation additive is selected from L-Ascorbyl 6-palmitate, L-Ascorbyl stearate, Benzene-1,2,3-triol, or any combination thereof, and
wherein a mass percentage of the anti-deformation additive ranges from 0.1% to 5% of the mass of the gypsum.

2. The composition according to claim 1 , wherein the anti-deformation additive is Benzene-1,2,3-triol.

3. The composition according to claim 1 , wherein the anti-deformation additive is L-Ascorbyl 6-palmitate or L-Ascorbyl stearate.

4. A method for forming a composition, comprising:
mixing gypsum powder, starch, and an anti-deformation additive with water to create a mixture; and
stirring the mixture,
wherein the anti-deformation additive is selected from L-Ascorbyl 6-palmitate, L-Ascorbyl stearate, or any combination thereof, and
wherein a mass percentage of the anti-deformation additive ranges from 0.1% to 5% of the mass of the gypsum.

5. A gypsum board, comprising:
gypsum, starch, dispersant, accelerator, an anti-deformation additive, and a foaming agent,
wherein the anti-deformation additive is selected from ascorbic acid, L-Ascorbyl 6-palmitate, L-Ascorbyl stearate, Benzene-1,2,3-triol, or any combination thereof, and
wherein a mass percentage of the anti-deformation additive ranges from 0.1% to 5% of the mass of the gypsum.

6. The gypsum board according to claim 5 , wherein the anti-deformation additive is Benzene-1,2,3-triol.

7. The gypsum board according to claim 5 , wherein the board is wrapped by a liner.

8. The gypsum board according to claim 7 , wherein the liner is selected from a paper sheet, a non-woven mat comprising of polymeric and/or glass fibers, or the like.

9. A method for forming a gypsum board, comprising:
mixing gypsum, water, starch, an accelerator, a dispersant, an anti-deformation additive, and a foaming agent, to create a mixture;
wherein the anti-deformation additive is selected from ascorbic acid, L-Ascorbyl 6-palmitate, L-Ascorbyl stearate, Benzene-1,2,3-triol, or any combination thereof, and wherein a mass percentage of the anti-deformation additive ranges from 0.1% to 5% of the mass of the gypsum;
stirring the mixture to form a slurry;
disposing the slurry between two liners to form a sandwich structure;
forming a first board based on the sandwich structure;
cutting the first board into a plurality of second boards with desired lengths after a hardening process;
drying the plurality of second boards to evaporate excess water.

10. The method according to claim 9 , wherein the anti-deformation additive is Benzene-1,2,3-triol.

11. A method of reducing deformation in a gypsum product comprising adding at least one compound selected from ascorbic acid, L-Ascorbyl 6-palmitate, L-Ascorbyl stearate, Benzene-1,2,3-triol, or any combination thereof as an anti-deformation additive in the gypsum product, and wherein a mass percentage of the anti-deformation additive ranges from 0.1% to 5% of the mass of the gypsum.

12. A gypsum board, comprising:
gypsum, starch, dispersant, accelerator, and an anti-deformation additive,
wherein the anti-deformation additive is selected from ascorbic acid, L-Ascorbyl 6-palmitate, L-Ascorbyl stearate, Benzene-1,2,3-triol, or any combination thereof, and
wherein a mass percentage of the anti-deformation additive ranges from 0.1% to 5% of the mass of the gypsum.

13. The gypsum board according to claim 12 , wherein the anti-deformation additive is Benzene-1,2,3-triol.

14. The gypsum board according to claim 12 , wherein the board is wrapped by a liner.

15. The gypsum board according to claim 14 , wherein the liner is selected from a paper sheet, a non-woven mat comprising of polymeric and/or glass fibers, or the like.

16. A method for forming a gypsum board, comprising:
mixing gypsum, water, starch, an accelerator, a dispersant, and an anti-deformation additive, to create a mixture;
wherein the anti-deformation additive is selected from ascorbic acid, L-Ascorbyl 6-palmitate, L-Ascorbyl stearate, Benzene-1,2,3-triol, or any combination thereof, and wherein a mass percentage of the anti-deformation additive ranges from 0.1% to 5% of the mass of the gypsum;
stirring the mixture to form a slurry;
disposing the slurry between two liners to form a sandwich structure;
forming a first board based on the sandwich structure;
cutting the first board into a plurality of second boards with desired lengths after a hardening process;
drying the plurality of second boards to evaporate excess water.

17. The method according to claim 16 , wherein the anti-deformation additive is Benzene-1,2,3-triol.

Assignees

• Gao Xiaotong
• Li Huifen
• Song Hao
• Zhang Ke
• Saint Gobain Placo

Inventors

• Gao Xiaotong
• Li Huifen
• Song Hao
• Zhang Ke

Classifications

• C04B28/14 Primary

  containing calcium sulfate cements {(gypsum-paper plates E04C)} · CPC title

• Y10T442/60

  Nonwoven fabric [i.e., nonwoven strand or fiber material] · CPC title

• C04B2111/00094

  Sag-resistant materials · CPC title

• B28B17/0036

  Cutting means, e.g. water jets · CPC title

• C04B2111/0062

  Gypsum-paper board like materials · CPC title