Composite wood board
In a stack of composite wood boards, the wood boards comprise wood particles and an organic binder.
1. A composite wood board having dimensions of at least 11.8 inches×11.8 inches (30 cm×30 cm) comprising wood particles and an organic binder, wherein the organic binder is substantially formaldehyde free and is selected from the group consisting of:
a binder based on a reducing sugar,
a binder based on an aldehyde containing sugar,
a binder which includes at least one reaction product of a carbohydrate reactant and an amine reactant,
a binder which includes at least one reaction product of a reducing sugar and an amine reactant,
a binder which includes at least one reaction product of a carbohydrate reactant and a polycarboxylic acid ammonium salt reactant, and
a binder which includes at least one reaction product from a Maillard reaction;
where the composite wood board has one or more of the following characteristics:
a modulus of elasticity (MOE) of at least 1800 N/mm 2 ,
a bending strength (MOR) of at least 14 N/mm 2 ,
an internal bond strength (IB) of at least 0.28 N/mm 2 ,
a thickness swelling after 24 hours in water at 20° C. of less than or equal to 12%,
a water absorption after 24 hours in water at 20° C. of less than or equal to 40%.
2. The composite wood board of claim 1 , wherein the composite wood board is formaldehyde free.
3. The composite wood board of claim 1 , wherein the composite wood board has a modulus of elasticity (MOE) of at least about 1800 N/mm 2 .
4. The composite wood board of claim 3 , wherein the modulus of elasticity (MOE) is at least about 2500 N/mm 2 .
5. The composite wood board of claim 1 , wherein the composite wood board has a bending strength (MOR) of at least about 14 N/mm 2 .
6. The composite wood board of claim 5 , wherein the bending strength (MOR) is at least about 18 N/mm 2 .
7. The composite wood board of claim 1 , wherein the composite wood board has an internal bond strength (IB) of at least 0.28 N/mm 2 .
8. The composite wood board of claim 7 , wherein the internal bond strength (IB) is at least 0.4 N/mm 2 .
9. The composite wood board of claim 1 , wherein the composite wood board swells less than or equal to about 12%, as measured by a change in thickness, after 24 hours in water at 20° C.
10. The composite wood board of claim 9 , wherein the composite wood board has a water absorption after 24 hours in water at 20° C. of less than or equal to about 40%.
11. The composite wood board of claim 1 , wherein the composite wood board is a wood particleboard.
12. The composite wood board of claim 1 , wherein the composite wood board is an orientated strandboard.
13. The composite wood board of claim 1 , wherein the composite wood board is a medium density fiberboard.
14. The composite wood board of claim 1 , wherein the organic binder comprises from about 8 to about 18% by weight (weight of dry resin to weight of dry wood particles) of the composite wood board.
15. The composite wood board of claim 1 , wherein the organic binder comprises a product of a reaction including a reducing sugar.
16. The composite wood board of claim 15 , wherein the organic binder comprises at least one Maillard reaction product.
17. The composite wood board of claim 1 , wherein the organic binder comprises a product of a reaction of citric acid, ammonia and dextrose.
18. The composite wood board of claim 1 , wherein the composite wood board further comprises a wax.
19. The composite wood board of claim 18 , wherein the wax comprises from about 0.1 to about 2% by weight of the composite wood board.
20. The composite wood board of claim 1 , wherein the organic binder is a bioresin.