Wood composites bonded with soy protein-modified urea-formaldehyde resin adhesive binder
An adhesive binder composition containing a urea-formaldehyde resin modified with a modified soy protein, and the use of the binder for preparing wood composites, especially particleboard.
1 . A wood composite bonded with an adhesive binder composition comprising a urea-formaldehyde resin and a modified soy protein selected from the group consisting of soy protein modified with saturated and unsaturated alkali metal C 8 -C 22 sulfate and sulfonate salts, soy protein modified with compounds having the formula R 2 NC(═X)NR 2 , and blends thereof, said protein provided in an amount of 1 percent to 50 percent by weight of adhesive solids.
2 . The wood composite of claim 1 made using a wood source selected from wood flakes, wood fibers, wood particles, wood wafers, wood strips, wood strands, and wood veneer.
3 . The wood composite of claim 2 wherein the adhesive binder composition has a formaldehyde to urea mole ratio in the range of about 0.6:1 to about 1.6:1.
4 . The wood composite of claim 1 wherein said protein is provided in an amount of about 5 to about 40 percent by weight of adhesive solids.
5 . The wood composite of claim 2 wherein the urea-formaldehyde resin is synthesized at a formaldehyde to urea mole ratio in the range of 1.5:1 to 3.2:1.
6 . The composite of claim 2 wherein the modified soy protein is soy protein modified with saturated and unsaturated alkali metal C 8 -C 22 sulfate and sulfonate salts.
7 . The composite of claim 2 wherein the modified soy protein is soy protein modified with compounds having the formula R 2 NC(═X)NR 2 .
8 . A process for making a wood composite comprising applying an adhesive binder composition to a wood material, the adhesive binder composition comprising a urea-formaldehyde resin and a modified soy protein selected from the group consisting of soy protein modified with saturated and unsaturated alkali metal C 8 -C 22 sulfate and sulfonate salts, soy protein modified with compounds having the formula R 2 NC(═X)NR 2 , and blends thereof, said protein provided in an amount of 1 to 50 percent by weight of adhesive solids, consolidating said wood material and curing said urea-formaldehyde resin.
9 . The process of claim 8 wherein the resin and the protein are separately added during application to the wood material.
10 . The process of claim 8 wherein the wood material is selected from wood flakes, wood fibers, wood particles, wood wafers, wood strips, wood strands, and wood veneer.
11 . The process of claim 10 wherein the adhesive binder composition has a formaldehyde to urea mole ratio in the range of about 0.6:1 to about 1.6:1.
12 . The process of claim 8 , wherein the modified soy protein and the urea-formaldehyde resin are blended together with the wood material before the coated wood material is consolidated.
13 . The process of claim 12 wherein said protein is provided in an amount of about 5 percent to about 40 percent by weight of adhesive solids.
14 . The process of claim 10 wherein the urea-formaldehyde resin is synthesized at a formaldehyde to urea mole ratio in the range of 1.5:1 to 3.2:1.
15 . An adhesive binder composition comprising a urea-formaldehyde resin and a modified soy protein selected from the group consisting of soy protein modified with saturated and unsaturated alkali metal C 8 -C 22 sulfate and sulfonate salts, soy protein modified with compounds having the formula R 2 NC(═X)NR 2 , and blends thereof, said protein provided in an amount of 1 to 50 percent by weight of adhesive solids, consolidating said wood material and curing said urea-formaldehyde resin.
16 . The binder composition of claim 15 having a formaldehyde to urea mole ratio in the range of about 0.6:1 to about 1.6:1.
17 . The binder composition of claim 15 wherein said protein is provided in an amount of about 5 percent to about 40 percent by weight of adhesive solids.
18 . The binder composition of claim 15 wherein the urea-formaldehyde resin is synthesized at a formaldehyde to urea mole ratio in the range of 1.5:1 to 3.2:1.
19 . The binder composition of claim 15 wherein the modified soy protein is soy protein modified with saturated and unsaturated alkali metal C 8 -C 22 sulfate and sulfonate salts.
20 . The binder composition of claim 15 wherein the modified soy protein is soy protein modified with compounds having the formula R 2 NC(═X)NR 2 .