Engineered wood adhesives and engineered wood product therefrom
AssigneeCargill, Incorporated
InventorsMassimo Bregola, Thomas Luchsinger
Life of this patent
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Abstract
An aqueous adhesive composition and a process for preparing such compositions are disclosed. The composition comprises macromolecular complex comprising (A) a first component comprising (i) a framework element and (ii) a polyphenol, and (B) second component comprising a polypeptide, oligopeptide, amino acid, or polyamine. The 5 framework element comprises (a) a polypeptide, oligopeptide, amino acid, or polyamine, (b) a polysaccharide, oligosaccharide, or monosaccharide, or a saccharide conjugate, or (c) a lignin, a lignan or a lignin conjugate. The polyphenol comprises a tannin, a tannic acid, a flavonoid, or a poly-resorcinol. An adhesive precursor composition comprising the first component is also disclosed.
Claims39
A multi-layer engineered wood product, comprising:
- a first face layer;
- a second face layer;
- and
- a core layer disposed between the first face layer and the second face layer;
- wherein the first face layer and the second face layer independently comprise:
- a plurality of wood particles;
- and
- a reaction product of a binder reaction mixture dispersed preferably homogenously distributed, about the plurality of wood particles, the binder reaction mixture being present in a range of from 5 parts to 20 parts per 100 parts of a dry weight of the plurality of wood particles, a moisture content of the binder reaction mixture and the plurality of wood particles being in a range of 5 wt % to 20 wt % and comprising:
- an aqueous portion comprising a crosslinker in a range of from 20 wt % to 60 wt % based on the dry weight of the binder reaction mixture;
- and
- a polypeptide-containing component that is present in a range of from 40 wt % to 80 wt % based on the dry weight of the binder reaction mixture, the polypeptide-containing component comprising a milled rapeseed flour, milled sunflower flour, or a mixture thereof;
- and
- the core layer comprises a urea-formaldehyde based binder, a pre-polymerized methylene diphenyl diisocyanate based binder, a polyamidoamine-epichlorohydrin resin, a melamine-urea-formaldehyde based binder, or a mixture thereof.
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A method of making a multi-layer engineered wood product, the method comprising:
- (a) combining a first plurality of wood particles with a polypeptide-containing component comprising a rapeseed flour, sunflower flour, or a mixture thereof to produce a first mixture;
- (b) combining the first mixture produced at (a) with an aqueous formulation comprising a crosslinker to obtain a second mixture;
- (c) combining a second plurality of wood particles with a urea-formaldehyde based binder, a pre-polymerized methylene diphenyl diisocyanate based binder, a polyamidoamine-epichlorohydrin resin, a melamine-urea-formaldehyde based binder, or a mixture thereof to form a third mixture;
- (d) combining a third plurality of wood particles with a polypeptide-containing component comprising a rapeseed flour, sunflower flour, or a mixture thereof to produce a fourth mixture;
- (e) combining the fourth mixture produced at (d) with an aqueous portion comprising a crosslinker to obtain a fifth mixture;
- (f) stacking the second mixture, third mixture, and fifth mixture to form a multi-layer engineered wood precursor;
- and
- (g) curing the multi-layer engineered wood precursor, to form the multi-layer engineered wood product.
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Dependencies are inferred from the claim text.