Uncured articles with improved shelf-life
View Patent ↗Disclosed are formaldehyde-free, thermally-curable, alkaline, aqueous binder compositions. Also disclosed are compositions comprising formaldehyde-free, thermally-curable binder compositions, as described herein, applied to non-woven fibers. Uses of the disclosed binder compositions as binders for non-woven fibers are also disclosed.
1. A composition comprising an uncured binder disposed on mineral fibers, wherein the uncured binder consists of an aqueous mixture of (a) at least two reducing sugars comprising 1) at least one aldohexose sugar selected from the group consisting of dextrose, mannose, galactose, allose, altrose, talose, gulose, and idose; and 2) at least one ketohexose sugar selected from the group consisting of fructose, psicose, sorbose and tagatose, wherein the mixture has a lower crystallization point than a carbohydrate mixture consisting of dextrose; and (b) an acid precursor derivable from an inorganic salt selected from the group consisting of ammonium sulfate salts, ammonium phosphate salts, ammonium nitrate salts, ammonium carbonate salts and combinations thereof and/or (c) an ammonium salt of a polycarboxylic acid; optionally (d) a silicon-containing compound; and optionally (e) a corrosion inhibitor.
2. The composition of claim 1 , wherein the inorganic salt is selected from the group consisting of ammonium sulfate salts, ammonium phosphate salts, ammonium carbonate salts, and combinations thereof.
3. The composition of claim 1 , wherein the polycarboxylic acid is selected from the group consisting of unsaturated aliphatic polycarboxylic acids, saturated aliphatic polycarboxylic acids, aromatic polycarboxylic acids, unsaturated cyclic polycarboxylic acids, saturated cyclic polycarboxylic acids, and combinations thereof.
4. The composition of claim 1 , wherein the silicon-containing compound is selected from the group consisting of gamma-aminopropyltriethoxysilane, gamma-glycidoxypropyltrimethoxysilane, and mixtures thereof.
5. The composition of claim 1 , wherein the corrosion inhibitor is capable of decreasing the corrosivity of the composition.
6. The composition of claim 5 , wherein the corrosion inhibitor is selected from the group consisting of dedusting oil, monoammonium phosphate, sodium metasilicate pentahydrate, and melamine.
7. The composition of claim 1 , wherein the composition is a fiberglass insulation product.
8. The composition of claim 1 , wherein the mineral fibers comprise fibers selected from glass fibers and stone wool fibers.
9. The composition of claim 8 , wherein the mineral fibers comprise glass fibers.
10. The composition of claim 1 , wherein the mixture of at least two reducing sugars is provided as high fructose corn syrup (HFCS).
11. The composition of claim 1 , wherein the binder has a moisture content of 1.5-3%.
12. The composition of claim 1 , wherein the binder has a pH of 7.5-9.5.
13. The composition of claim 1 , wherein the mineral fibers comprise glass fibers at a compositional concentration of 80-99% by weight.
14. The composition of claim 1 , wherein the binder compriscs has 5-25% by dry weight of an acid precursor derivable from an inorganic salt selected from the group consisting of ammonium sulfate salts, ammonium phosphate salts, ammonium nitrate salts, ammonium carbonate salts and combinations thereof.
15. The composition of claim 1 , wherein the binder has 10-20% by dry weight of an acid precursor derivable from an inorganic salt selected from the group consisting of ammonium sulfate salts, ammonium phosphate salts, ammonium nitrate salts, ammonium carbonate salts and combinations thereof.
16. The composition of claim 1 , wherein the aqueous mixture is a viscous or tacky liquid.