Fiberglass non-woven catalyst
View Patent ↗The present invention relates to novel catalysts for use with a fiberglass non-woven binder. The catalyst can be a Lewis acid, an organic acid salt, a free-radical generator, or a mixture thereof. The catalyst provides stronger bonding, increased crosslinking density, reduced curing times, and reduced curing temperatures. Fiberglass mats made with polymer binder compositions containing the catalyst exhibit both flexibility and elasticity, allowing the mats to be compressed for storage, yet return to original thickness once the compressive forces are removed. Formaldehyde-free wood composites, such as plywood and fiberboard, may also be produced with polymer binder compositions containing the catalyst.
1. A non-woven binder composition comprising:
a water soluble polymeric binder synthesized from one or more acid monomers, the one or more acid monomers selected from the group consisting of one or more carboxylic acid monomers, one or more sulfonic acid monomers, one or more phosphonic acid monomers or mixtures thereof, wherein the one or more acid monomers comprise from 50 to 95 mole percent of the polymeric binder,
an active hydrogen cross-linker for crosslinking with the polymeric binder, and
from 1 to 25 percent by weight of a catalyst based on the weight of the binder,
wherein said catalyst is selected from the group consisting of a Lewis acid, an organic acid salt, a free radical generator, or a mixture thereof, and
wherein the binder composition is an aqueous composition.
2. The binder composition of claim 1 comprising from 1 to 10 percent by weight of the catalyst.
3. The binder composition of claim 1 wherein said catalyst is a Lewis acid.
4. The binder composition of claim 3 wherein said Lewis acid is selected from the group consisting of Al 2 (SO 4 ) 3 .H 2 O, MgCl 2 .6H 2 O, AlK(SO 4 ) 2 .10H 2 O, MgSO 4 , ZnSO 4 and combinations thereof.
5. The binder composition of claim 1 , wherein said acid monomer comprises acrylic acid, methacrylic acid, or a mixture thereof.
6. The binder of claim 1 wherein said polymeric binder and said active hydrogen cross-linker comprise a single copolymer comprising at least one acid monomer unit and at least one hydroxyl-, amine-, or amide-functional monomer unit.
7. The binder composition of claim 5 , wherein said copolymer contains acid monomer to hydroxyl-, amine-, or amide-functional monomer in a ratio of from 100:1 to 1:1.
8. The binder composition of claim 1 further comprising from 0 to 20 weight percent of one or more adjuvants selected from the group consisting of coupling agents, dyes, pigments, oils, fillers, thermal stabilizers, emulsifiers, curing agents, wetting agents, biocides, plasticizers, anti-foaming agents, waxes, flame-retarding agents, and lubricants.
9. The binder of claim 1 wherein said non-woven is fiberglass.
10. The binder composition of claim 1 , said active hydrogen cross-linker further comprising at least one hydroxyl-, amine-, or amide-functional monomer unit.
11. The binder composition of claim 10 wherein the mole ratio of acid-functional monomer to hydroxyl-, amine-, or amide-functional monomer is from 100:1 to 1:1.
12. The binder composition of claim 1 , said active hydrogen cross-linker further comprising a polyol having at least one hydroxyl-functional group.