Wood Composite Process Enhancement
Disclosed is a method of preparing a lignocellulosic composite; the method comprising the steps of combining one or more dry protein sources as powders and one or more lignocellulosic materials; subsequently combining with the protein and lignocellulosic combination, a liquid mixture comprising a curative for the protein source, forming the resulting mixture into a composite structure and then curing the composite structure.
1 . A method of preparing a lignocellulosic composite comprising the steps of combining one or more protein source(s) in powder form with one or more dry lignocellulosic materials to form a mixture; subsequently combining one or more curative(s) to the mixture forming a lignocellulosic composition; forming the resulting lignocellulosic composition into a composite structure; and curing the composite structure.
2 . The method of claim 1 , wherein the protein source comprises soy flour.
3 . The method of claim 2 , wherein the soy flour has a dispersability index greater than 50.
4 . The method of claim 1 , wherein the curative comprises formaldehyde based resin, isocyanate based resin; and/or polyamidoamine-epichlorohydrin resin.
5 . The method of claim 1 , wherein the curative is greater than 1 percent of the lignocellulosic composition on a dry weight basis.
6 . The method of claim 1 , wherein the lignocellulosic composition further comprises a formaldehyde scavenger.
7 . The method of claim 6 , wherein the formaldehyde scavenger is urea.
8 . The method of claim 1 , wherein the composite structure is particleboard or medium density fiber board.
9 . The method of claim 8 , wherein the particleboard is composed of multiple layers formed with a formaldehyde and lignocellulosic mixture and/or an isocyanate and lignocellulosic mixture or composition.
10 . The method of claim 1 , wherein the moisture level of the composite structure just prior to curing is less than 8% on dry lignocellulosic weight basis.
11 . The method of claim 1 , wherein the curative is substantially free of a formaldehyde based or formaldehyde generating compound.
12 . The method of claim 1 , further comprising separately combining one or more additives to the protein source; dry lignocellulosic material; lignocellulosic mixture; lignocellulosic composition and/or combinations thereof.
13 . The method of claim 1 , wherein the composite structure is cured by heat.
14 . The method of claim 1 , wherein the protein source contains urease and the composite structure contains urea resulting in an increase of pH after addition of the urea and before curing of the composite structure.
15 . The method of claim 1 , wherein the overall protein level of the lignocellulosic composition on a dry lignocellulosic weight basis is from about 0.5 to about 15%.
16 . The method of claim 15 , wherein the overall protein level of the lignocellulosic composition on a dry lignocellulosic weight basis is from about 1 to 5%.
17 . The method of claim 1 , wherein an electrostatic charge is applied to the powdered protein source.
18 . The method of claim 1 , wherein an electrostatic charge is applied to the dry lignocellulosic material.
19 . A method of preparing a lignocellulosic composite comprising the steps of simultaneously combining one or more protein source(s) in powder form; one or more dry lignocellulosic materials; and one or more curative(s) thereby forming a lignocellulosic composition; forming the resulting lignocellulosic composition into a composite structure; and curing the composite structure.
20 . A method of preparing a lignocellulosic composite comprising the steps of combining one or more protein source(s) in powder form with one or more dry lignocellulosic materials to form a mixture; combining one or more additive(s) to the mixture, wherein at least one of the additive(s) is a curative and the one or more additive(s) can be combined simultaneously with the protein source and lignocellulosic material mixture or subsequent to combining the protein source and lignocellulosic material thereby forming a lignocellulosic composition; forming the lignocellulosic composition into a composite structure; and curing the composite structure.