Viscosity modified formaldehyde-free binder compositions

Patent metadata

Field	Value
Publication number	US-10815593-B2
Application number	US-201213675414-A
Country	US
Kind code	B2
Filing date	Nov 13, 2012
Priority date	Nov 13, 2012
Publication date	Oct 27, 2020
Grant date	Oct 27, 2020

Abstract

Viscosity-modified carbohydrate binder compositions are described. The binder compositions may include a carbohydrate, a nitrogen-containing compound, and a thickening agent. The binder compositions may have a Brookfield viscosity of 7 to 50 centipoise at 20° C. The thickening agents may include modified celluloses such as hydroxyethyl cellulose (HEC) and carboxymethyl cellulose (CMC), and polysaccharides such as xanthan gum, guar gum, and starches.

First claim

What is claimed is:

1. A carbohydrate binder composition comprising a reducing sugar, a nitrogen-containing compound, and a thickening agent, wherein:
the nitrogen-containing compound is a reaction product of urea (H 2 N—CO—NH 2 ) and glyoxal,
the binder composition has a Brookfield viscosity of 7 to 50 centipoise at 20° C. as measured with a Brookfield viscometer using spindle 18 at 60 rpm,
the binder composition is formaldehyde-free and forms a polymerization product, and
the thickening agent has a concentration of 0.03 wt. % to 0.3 wt. % of the binder composition.

2. The carbohydrate binder composition of claim 1 , wherein the reducing sugar is chosen from dextrose, fructose, allose, galactose, xylose, ribose, maltose, cellobiose, and lactose.

3. The carbohydrate binder composition of claim 1 , wherein the reaction product comprises 4,5-dihydroxyimidazolidin-2-one.

4. The carbohydrate binder composition of claim 1 , wherein the binder composition further comprises a reaction product of an organic anhydride and an alkanol amine.

5. The carbohydrate binder composition of claim 1 , wherein the thickening agent comprises a modified cellulose.

6. The carbohydrate binder composition of claim 5 , wherein the modified cellulose is chosen from carboxymethyl cellulose (CMC), and hydroxyethyl cellulose (HEC).

7. The carbohydrate binder composition of claim 1 , wherein the thickening agent comprises a polysaccharide.

8. The carbohydrate binder composition of claim 7 , wherein the polysaccharide is chosen from xanthan gum, guar gum, and starch.

9. The carbohydrate binder composition of claim 1 , wherein the thickening agent comprises acrylic acid.

10. The carbohydrate binder composition of claim 1 , wherein:
the reducing sugar comprises dextrose;
the nitrogen-containing compound is 4,5-dihydroxyimidazolidin-2-one; and
the thickening agent comprises hydroxyethyl cellulose, wherein the hydroxyethyl cellulose has a concentration of 0.05 wt. % to 0.3 wt. % of the binder composition.

11. The carbohydrate binder composition of claim 1 , wherein:
the reducing sugar comprises dextrose;
the nitrogen-containing compound is 4,5-dihydroxyimidazolidin-2-one; and
the thickening agent comprises xanthan gum, wherein the xanthan gum has a concentration of 0.03 wt. % to 0.2 wt. % of the binder composition.

12. A blended carbohydrate binder composition comprising a reducing sugar, a nitrogen-containing compound, and a second binder composition, wherein:
the nitrogen-containing compound is a reaction product of urea (H 2 N—CO—NH 2 ) and glyoxal,
the blended carbohydrate binder composition has a Brookfield viscosity of 7 to 50 centipoise at 20° C. as measured with a Brookfield viscometer using spindle 18 at 60 rpm,
the second binder composition is formaldehyde-free and forms a polymerization product, and
the blended carbohydrate binder composition comprises a thickening agent at a concentration from 0.03 wt. % to 0.3 wt. % of the blended carbohydrate binder composition.

13. The blended carbohydrate binder composition of claim 12 , wherein the second binder composition is selected from the group consisting of a latex binder composition and a solution polymer binder composition.

14. The carbohydrate binder composition of claim 1 , wherein the binder composition is an aqueous solution.

15. The blended carbohydrate binder composition of claim 12 , wherein the second binder composition is a solution polymer binder composition.

16. The carbohydrate binder composition of claim 1 , wherein the molar ratio of the nitrogen-containing compound to the reducing sugar is in a range from 1:4 to 1:10.

Assignees

• Johns Manville

Inventors

• Guo Zhihua
• Lester Uranchimeg
• Asrar Jawed
• Shooshtari Kiarash Alavi
• Zhang Mingfu

Classifications

• D04H1/4242 Primary

  Carbon fibres · CPC title

• C09J101/28

  Alkyl ethers · CPC title

• D21H17/20

  Macromolecular organic compounds · CPC title

• D21H13/40

  vitreous, e.g. mineral wool, glass fibres · CPC title

• D04H1/4218

  Glass fibres · CPC title