Engineered wood adhesives and engineered wood products made therefrom

Abstract

According to various aspects of the present disclosure, a multi-layer engineered wood product may include a first surface layer, a second surface layer, and a core layer disposed between the first surface layer and the second surface layer. At least one of the first surface layer, the second surface layer, and the core layer includes a plurality of wood components and a reaction product of a binder reaction mixture dispersed about the plurality of wood components. The mixture of wood components and binder reaction mixture has a moisture content in the range of 9% to 20% by weight.

Description

[Technical field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims the benefit of PCT Patent Application No. PCT / US2021 / 034906, filed May 28, 2021, which is incorporated by reference in its entirety. [Background technology]

[0002] The most commonly used wood adhesives are phenol-formaldehyde resin (PF) and urea-formaldehyde resin (UF). There are at least two concerns with PF and UF resins. First, volatile organic compounds (VOCs) are generated during the manufacture and use of lignocellulosic composites. Growing concerns about the effects of emitted VOCs, especially formaldehyde, on human health have prompted the need for more environmentally acceptable adhesives. Second, PF and UF resins are made from petrochemicals (e.g., petroleum-derived products or natural gas-derived products). Petroleum reserves are naturally limited. The wood composite industry would greatly benefit from the development of formaldehyde-free adhesives made from renewable natural resources. Summary of the Invention

[0003] According to various aspects of the present disclosure, the multi-layer engineered wood product may include a first surface layer, a second surface layer, and a core layer disposed between the first surface layer and the second surface layer. At least one of the first surface layer, the second surface layer, and the core layer includes a plurality of wood components and a reaction product of a binder reaction mixture dispersed around the plurality of wood components. The binder reactant is added in a range of 3 parts to 25 parts per 100 parts dry weight of the plurality of wood components. The mixture of the wood components and the binder reaction mixture has a moisture content in a range of 9% to 20% by weight. The binder reaction mixture includes an aqueous portion including a polyol component added in a range of 5% to 65% by weight or 5% to 50% by weight based on the dry weight of the binder reaction mixture. The polyol component includes glycerol, oligomers of glycerol, optionally a monosaccharide, optionally sucrose, sorbitol, or mixtures thereof. The binder reaction mixture further comprises a polypeptide-containing component added in the range of 20% to 85% by weight based on the dry weight of the binder reaction mixture. The polypeptide-containing component comprises a vegetable protein. The binder reaction mixture further comprises a base in the range of 0.5% to 15% by weight based on the dry weight of the binder reaction mixture. Optionally, the binder reaction mixture comprises a tackifier in the range of 0.001% to 1.5% by weight of the binder reaction mixture. Optionally, the binder reaction mixture comprises sodium sulfite, sodium bisulfite, sodium metabisulfite, or mixtures thereof in the range of 0.5% to 10% by weight based on the dry weight of the binder reaction mixture. Optionally, the binder reaction mixture comprises borax in the range of 1% to 15% by weight based on the dry weight of the binder reaction mixture.

[0004] According to a further aspect of the present disclosure, a method of making a multi-layer engineered wood product includes (a) mixing a polyol component, water, a base, optionally a tackifier, optionally sodium sulfite, sodium bisulfite, sodium metabisulfite, or mixtures thereof, and optionally borax to form a first mixture. The polyol component includes glycerol, an oligomer of glycerol, optionally a monosaccharide, optionally sucrose, sorbitol, or mixtures thereof. The method further includes (b) mixing the first mixture produced in (a) with a plurality of wood components to form a second mixture, or mixing the first mixture produced in (a) with a polypeptide-containing component comprising a plant protein to form a third mixture. The method further includes (c) mixing the second mixture produced in (b) with a polypeptide-containing component comprising a plant protein to form a fourth mixture, or mixing the third mixture produced in (b) with a plurality of wood components to form a fifth mixture to form a first engineered wood precursor. The method further includes (d) repeating (a)-(c) at least once to form a second engineered wood precursor. The method further includes (e) stacking the first engineered wood precursor and the second engineered wood precursor with a third engineered wood precursor, optionally formed according to (a)-(c). The method further includes (f) curing the first engineered wood precursor, the second engineered wood precursor, and the third engineered wood precursor.

[0005] According to a further aspect of the present disclosure, a method of making a multi-layer engineered wood product includes (a) mixing a polyol component, water, a base, optionally a tackifier, optionally sodium sulfite, sodium bisulfite, sodium metabisulfite, or mixtures thereof, and optionally borax to form a first mixture. The polyol component includes glycerol, an oligomer of glycerol, optionally a monosaccharide, optionally sucrose, or mixtures thereof. The invention further includes (b) mixing the first mixture produced in (a) with a plurality of wood components to form a second mixture, or mixing the plurality of wood components with a polypeptide-containing component comprising plant protein to form a third mixture. The method further includes (c) mixing the second mixture produced in (b) with a polypeptide-containing component comprising plant protein to form a fourth mixture, or mixing the third mixture produced in (b) with the first mixture produced in (a) to form a fifth mixture to form a first engineered wood precursor. The method further includes (d) repeating (a)-(c) at least once to form a second engineered wood precursor. The method further includes (e) stacking the first engineered wood precursor and the second engineered wood precursor with a third engineered wood precursor, optionally formed according to (a)-(c). The method further includes (f) curing the first engineered wood precursor, the second engineered wood precursor, and the third engineered wood precursor.

[0006] Typically, during curing, the platens are heated to a temperature of at least 100° C., for example, at least 120° C., or at least 187° C., in the range of 100° C. to 250° C., in the range of 180° C. to 220° C., or in the range of 120° C. to 190° C. In some examples, the platens are heated to achieve a curing temperature of at least 198° C., at least 204° C., at least 246° C., in the range of 198° C. to 232° C., in the range of 204° C. to 226° C., in the range of 210° C. to 221° C., less than 315° C., or preferably less than 230° C. Typically, the platens are heated to achieve a curing temperature of 204° C. to 248° C., in the range of 210° C. to 243° C., in the range of 210° C. to 226° C., at least 215° C., or at least 251° C.

[0007] As used herein, "mixing" means combining ingredients together or by adding them together. For example, "mixing" can include spraying at least one ingredient into another ingredient. For example, "mixing" can include stirring the ingredients.

[0008] As used herein, "mixture" means a portion of a substance that contains two or more chemical substances. The wood particles used in the surface layers typically have a lower average aspect ratio than the wood particles used in the core layer. In addition, the wood particles used in the surface layers 102 and 104 have a smaller average particle size than the wood particles used in the core layer 106. Smaller wood particles in the surface layers result in a surface layer with a greater density than the core layer. It is expected that the density of the first surface layer, the second surface layer, or both, will be greater than the density of the core layer. [Brief description of the drawings]

[0009] The drawings illustrate generally, by way of example, but not by way of limitation, various embodiments of the present invention. [Figure 1] 1 is a side cross-sectional view of a multi-layer engineered wood product according to various aspects of the present patent application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Reference will now be made in detail to certain embodiments of the disclosed subject matter. While the disclosed subject matter will be described in conjunction with the recited claims, it will be understood that the illustrated subject matter is not intended to limit the claims to the disclosed subject matter.

[0011] In this document, the terms "a," "an," or "the" are used to include one or more than one, unless the context clearly dictates otherwise. The term "or" is used to refer to a non-exclusive "or" unless otherwise indicated. The phrase "at least one of A and B" has the same meaning as "A, B, or A and B." Furthermore, it is to be understood that any phraseology or terminology used herein and not otherwise defined is for purposes of description only and not of limitation. Any use of section headings is intended to aid in the reading of the document and should not be construed as limiting. Information associated with a section heading may be found within that particular section or outside that section.

[0012] As used herein, the term "substantially" refers to a majority or majority portion, such as at least about 90%, 95%, 99.5%, or 100%. As used herein, the term "substantially free" can mean that the amount of a material present has no or little effect on the material properties of a composition that includes that material, such that about 0% to about 5% by weight of the composition is that material, or about 0% to about 1%, or about 5% or less by weight, or about 0% by weight.

[0013] According to various aspects of the present disclosure, a multi-layer engineered wood product is described. The multi-layer engineered wood product can typically take the form of particleboard, medium density fiberboard, high density fiberboard, oriented strand board, multi-layer engineered wood flooring, and combinations thereof. The multi-layer engineered wood product is typically sized to have any suitable dimensions. For example, the multi-layer engineered wood product is typically sized to 1.2 meters wide and 2.6 meters long, or 1.3 meters wide and 2.1 meters long. The thickness of the multi-layer engineered wood product typically ranges from 1.5 cm to 2.5 cm, or 1.8 cm to 2.1 cm. These dimensions are meant to be merely examples and do not limit the size of the multi-layer engineered wood product that is typically produced.

[0014] According to various aspects of the present disclosure, the density of the multi-layer engineered wood product is typically less than 0.2 g / cm 3 ~0.8g / cm 3 , 0.60g / cm 3 ~0.75g / cm 3 , 0.65g / cm 3 ~0.75g / cm 3 , or 0.65 g / cm 3 ~0.70g / cm 3 The range is.

[0015] FIG. 1 is a side cross-sectional view of a multi-layer engineered wood product 100 according to various embodiments of the present patent application. As shown in FIG. 1, the multi-layer engineered wood product 100 includes a first surface layer 102 and a second surface layer 104 with a core layer 106 bonded therebetween. The thicknesses of each of the layers 102, 104, and 106 are typically the same or different. In some embodiments, the core layer 106 comprises 50%-80%, or 50%-75%, or 60%-70% of the total thickness of the multi-layer engineered wood product 100. In some embodiments, the first surface layer 102 and the second surface layer 104 independently comprise 10%-25%, 12.5%-25%, or 15%-20% of the total thickness of the multi-layer engineered wood product 100. Although three layers are shown, the multi-layer engineered wood product 100 can have additional layers. Thus, the teachings regarding first surface layer 102, second surface layer 104, and core layer 106 may be applied to any additional layers not specifically described herein.

[0016] The first surface layer 102, the second surface layer 104, and the core layer 106 can typically include various components. For example, the first surface layer 102, the second surface layer 104, and the core layer 106 can typically include multiple wood components individually bound together by a binder. According to various examples, the binder of at least one individual layer (e.g., layers 102, 104, and 106) is a reaction product of a binder reaction mixture that includes an at least partially undissolved polypeptide component distributed about the binder reaction mixture. In other examples, only the core layer 106 includes a binder that is a reaction product of a binder reaction mixture that includes an at least partially undissolved polypeptide component distributed about the binder reaction mixture (the first surface layer 102 and the second surface layer 104 can include alternative binders). In other examples, the core layer 106 may not include a binder that is a reaction product of a binder reaction mixture that includes an at least partially undissolved polypeptide component distributed about the binder reaction mixture, and the first surface layer 102, the second surface layer 104, or both, may include a binder that is a reaction product of a binder reaction mixture that includes an at least partially undissolved polypeptide component distributed about the binder reaction mixture.

[0017] The wood particles used in the surface layers 102 and 104 typically have a lower average aspect ratio than the wood particles used in the core layer 106. Additionally, the wood particles used in the surface layers 102 and 104 have a smaller average particle size than the wood particles used in the core layer 106. Smaller wood particles in the surface layers result in a surface layer with a greater density than the core layer. It is expected that the density of the first surface layer, the second surface layer, or both, will be greater than the density of the core layer. Without intending to be bound by any theory, it is believed that a higher density of the surface layers relative to the core layer may improve the overall balance of physical properties of the engineered wood product.

[0018] In a multi-layer engineered wood product, the binder, which is the reaction product of the binder reaction mixture, may typically be added to any of the layers 102, 104, and 106 individually in a range of 3 parts to 25 parts per 100 parts dry weight of the wood component of the respective layer, such as 4.5 parts to 23.5 parts, 3 parts to 20 parts, or 6 parts to 17 parts, or 8 parts to 17 parts per 100 parts dry weight of the wood component of the respective layer. Having binder levels in these ranges can contribute to a multi-layer engineered wood product having preferred or desirable physical properties while effectively minimizing the amount of binder required to bond the multiple wood components of each layer. In some embodiments, the chemical composition of each of the layers 102, 104, and 106 (e.g., components of the binder reaction mixture and moisture content of the mixture of wood components and binder reaction mixture) are typically similar (e.g., within 1% of each other). Alternatively, the chemical composition of any one or more of the layers 102, 104, and 106 (e.g., the components of the binder composition and the moisture content of the mixture of the wood components and the binder reaction mixture) are typically different (e.g., greater than 1% from one another). The binder is typically characterized as a biopolymer.

[0019] Examples of desirable physical properties of a multi-layer engineered wood product may include the product's modulus of rupture (MOR), modulus of elasticity (MOE), thickness swelling ratio (thickness swelling %), or a combination thereof. The modulus of rupture of a multi-layer engineered wood product measures the amount of force required to cause the multi-layer engineered wood product to break. The modulus of rupture is typically measured, for example, according to ASTM D 1037-06a. While the modulus of rupture value may depend on a variety of factors including the density, length, width, thickness, or a combination thereof, of the multi-layer engineered wood product, the modulus of rupture is generally measured at 10 N / mm 2 ~25N / mm 2 , or 12N / mm 2 ~20N / mm 2 , or 13N / mm 2 ~18N / mm 2 The range may be:

[0020] Modulus of elasticity is a quantity that measures the resistance of a multi-layer engineered wood product to being elastically (e.g., non-permanently) deformed when stress is applied. Modulus of elasticity is typically measured, for example, according to ASTM D 1037-06a. While modulus values ​​typically depend on a variety of factors, including density, length, width, thickness, or a combination thereof, of the multi-layer engineered wood product, modulus of elasticity is typically less than 1,378 N / mm 2 ~2,413N / mm 2 , or 1,930 N / mm 2 ~2,137N / mm 2 (For example, 1,965N / mm 2 ~2,033N / mm 2 ) range.

[0021] Thickness swelling % is a quantity that measures the resistance of a multi-layer engineered wood product to water penetration. The higher the value, the greater the amount of water that has penetrated. This may result in swelling or other deformation of the multi-layer engineered wood product. For example, the multi-layer engineered wood product may expand beyond a desired amount. This is typically undesirable when the multi-layer engineered wood product has precise features, such as boreholes, flanges, grooves, etc., that are designed to precisely mate with corresponding features on another product. Thickness swelling % values ​​are typically measured, for example, according to ASTM D 1037-06a. According to some embodiments, the thickness swelling % after immersing the multi-layer engineered wood in water for 2 hours is typically as low as 0. However, other acceptable values ​​include values ​​ranging from 5% to 50%, 5% to 45%, or 20% to 40%, measured after immersing the multi-layer engineered wood product in water for 2 hours.

[0022] Internal bond strength is a measure of the strength of an article to resist breaking in a direction perpendicular to the surface of the article. Internal bond strength is typically measured, for example, by ASTM D 1037-06a. According to some embodiments, the internal bond strength of a multi-layer engineered wood product is typically less than 0.1 N / mm 2 ~0.83N / mm 2 , or 0.2N / mm 2 ~0.7N / mm 2 , or 0.3N / mm 2~0.6N / mm 2 The range is.

[0023] The advantage of using multi-layer engineered wood products formed using the materials and methods described herein is that the properties of the multi-layer engineered wood products are generally comparable to those of corresponding multi-layer engineered wood products that typically differ in the exclusive use of urea-formaldehyde (UF) binders. Urea-formaldehyde resins are synthetic resins produced by the chemical combination of formaldehyde (a gas produced from methane) and urea (a solid crystal produced from ammonia). Urea-formaldehyde resins are primarily used to bond plywood, particle board, and other wood products. Urea-formaldehyde resins polymerize into a permanently interconnected network structure, which affects the strength of the cured adhesive. After fixing and curing, urea-formaldehyde resins form an insoluble three-dimensional network structure and cannot be melted or thermoformed.

[0024] However, there are many drawbacks associated with using urea-formaldehyde. For example, at high temperatures and with the addition of water, the hardened urea-formaldehyde can hydrolyze and release formaldehyde, which weakens the adhesive bond and can be toxic. Furthermore, urea-formaldehyde must be used in a well-ventilated area because the uncured resin can be irritating and toxic. In addition, urea-formaldehyde adhesives generally have a limited shelf life. However, according to some embodiments, urea-formaldehyde resin can be included in a layer of the multi-layer engineered wood product 100. For example, urea-formaldehyde resin or a methylene diphenyl diisocyanate binder (e.g., prepolymerized methylene diphenyl diisocyanate, typically referred to as "PMDI") or a polyamide-epichlorohydrin-based binder (typically containing protein) can be disposed in the core layer 106 or the first surface layer 102 and / or the second surface layer 104.

[0025] The materials described herein can address at least some of these shortcomings, and in particular can prevent substantially any formaldehyde outgassing. Moreover, according to various embodiments, the modulus of rupture, thickness swelling %, elastic modulus, or combinations thereof of the multi-layer engineered wood can be substantially similar to the modulus of rupture, modulus of rupture, thickness swelling %, or combinations thereof of a corresponding multi-layer engineered wood that differs in that the reaction product exclusively uses urea-formaldehyde or methylene diphenyl diisocyanate binders or polyamide-epichlorohydrin-based binders. More specifically, the thickness swelling %, modulus of rupture, modulus of rupture, or combinations thereof of the multi-layer engineered wood is typically within 1% to 10%, 1% to 5%, or substantially the same as the modulus of rupture, modulus of rupture, thickness swelling %, or combinations thereof of the corresponding multi-layer engineered wood product. However, in further embodiments, the modulus of rupture, modulus of rupture, thickness swelling %, or combinations thereof are typically within 50% to 150% of the corresponding multi-layer engineered wood product.

[0026] The properties of the multi-layer engineered wood product described herein are typically further achieved or enhanced by distributing the binder, for example, substantially uniformly around the multiple wood components. Other properties, such as thickness swelling %, can typically be achieved or enhanced by adding a swelling retarder, distributed around the multi-layer engineered wood product. The swelling retarder may include a wax emulsion capable of maintaining (e.g., remaining stable) a high pH environment, greater than 10. If present, the swelling retarder is typically 0.1% to 1% or 0.5% to 0.7% by weight of the multi-layer engineered wood product.

[0027] The multi-layer engineered wood product described herein is formed from a multi-layer engineered wood precursor mixture. The multi-layer engineered wood precursor mixture includes at least a plurality of wood components, an aqueous portion of a binder reaction mixture, and a polypeptide-containing component distributed around the binder reaction mixture. The plurality of wood components can include one or more wood particles, one or more wood components, or one or more wood strands. The wood components can include wood materials such as pine, hemlock, spruce, aspen, birch, maple, or mixtures thereof.

[0028] The aqueous portion of the binder composition has an initial viscosity (before curing) of 5 centipoise (cP) to 1,000 cP, 10 cP to 500 cP, 50 cP to 300 cP, and in cases where a lower viscosity is particularly beneficial, an initial viscosity of 10 cP to 100 cP at 25° C. Viscosity is measured using a Brookfield DV1 viscometer available from Brookfield Ametek.

[0029] As described herein above, if present in either the first surface layer 102, the second surface layer 104, or the core layer 106, the binder reaction mixture can typically be added in the range of 3-25 parts per 100 parts dry weight of the wood component of the respective layer. The binder composition can typically include a polyol component and a base material. Additionally, the polypeptide-containing component is typically distributed around the binder reaction mixture after the polyol component, base, and wood component are mixed. The polypeptide-containing component can typically be substantially non-dissolved.

[0030] The polypeptide-containing component may be in the form of a solid (eg, a powder) or may be in the form of a slurry or suspension (eg, containing both solid and liquid phases).

[0031] The polyol component is typically in aqueous form ranging from 5% to 65% or 5% to 50% or 10% to 50% or 20% to 50% or 20% to 40% or 20% to 30% by weight based on the dry weight of the binder reaction mixture. The polyol component may include glycerol, oligomers of glycerol, monosaccharides, sucrose, or mixtures thereof. The glycerol or oligomers of glycerol may include pure glycerol or oligomers of glycerol. The glycerol component typically includes at least 80% by weight glycerol on a dry weight basis (e.g., at least 85%, at least 90%, or at least 95% by weight on a dry weight basis). In some embodiments, the glycerol or oligomers of glycerol are diluted. For example, in some embodiments, the glycerol component may include crude glycerol. The crude glycerol may comprise 30% to 95% by weight glycerol or 55% to 95% by weight glycerol. An illustrative example of crude glycerol is a mixture comprising 10 to 20% by weight water (e.g., 15% by weight), 3% to 7% by weight NaCl (e.g., 4% to 5% by weight), and 80% to 92% by weight glycerol (e.g., 87.5% by weight). The crude glycerol may comprise additional materials known to those of skill in the art. In some embodiments, the glycerol may be technical glycerol with a high concentration of glycerol and less than 1% by weight methanol, less than 0.5% by weight methanol, or less than 0.1% by weight methanol and less than 1% by weight NaCl, less than 0.5% by weight NaCl, or less than 0.1% by weight NaCl.

[0032] Examples of suitable monosaccharides include glucose syrup, high fructose corn syrup, or mixtures thereof. In the polyol component. In some embodiments, the polyol component includes glucose syrup, high fructose corn syrup, or mixtures thereof. In some embodiments, the glucose syrup may have a dextrose equivalent (DE) of at least 60, at least 80, at least 85, at least 90, or at least 95. As understood herein, dextrose equivalent is a measure of the amount of reducing sugar present in the sugar product, expressed as a percentage of dextrose on a dry basis. As used herein, high fructose corn syrup includes at least 90% by weight of fructose and glucose. In some embodiments, high fructose corn syrup may include at least 94% by weight of fructose and glucose. In some embodiments, high fructose corn syrup includes 30% to 70% by weight of glucose or 35% to 65% by weight of glucose. In some embodiments, the binder reaction mixture may include, in addition to the polyol component, fructose, sucrose, or glucose (or mixtures thereof). If added, the fructose, sucrose, or glucose (or mixtures thereof) is typically 1% to 30%, 5% to 20%, or preferably 5% to 10% by weight based on the dry weight of the binder reaction mixture.

[0033] The base can typically be added to the binder reaction mixture in the range of 1% to 15%, 1% to 12%, or 3% to 10% by weight based on the dry weight of the binder reaction mixture. The base can typically be added to such an extent that the pH of the aqueous portion of the binder reaction mixture is greater than 10 but less than 14. Thus, the pH is typically in the range of 10 to 14 or 11 to 14. Typically, the base comprises NaOH, KOH, magnesium oxide, or mixtures thereof. In some embodiments, the base is another strong base (e.g., Ca(OH) 2The base may include sodium hydroxide, sodium phosphate, or another base that dissolves completely in the solution, or sodium carbonate. In some embodiments, ammonium or ammonium hydroxide can be used as the base, but they are not preferred due to their tendency to generate gaseous ammonia. In some embodiments, the base includes only NaOH. It has been found that using a base to achieve these pH values ​​results in, among other things, improvements in thickness swell %, modulus of rupture, and modulus of elasticity of the resulting multi-layer engineered wood product.

[0034] Without intending to be limited by any theory, it is believed that the base, at the disclosed concentrations, provides a high pH environment that enhances the reaction between the polyol component, the polypeptide-containing component, and the wood component to form a biopolymer network that encases the wood components. For example, it is believed that the base can assist in dissolving at least a portion of the individual wood components. This allows the binder precursor solution to at least partially penetrate into the interior of the individual wood components. Thus, when the binder precursor is subjected to hardening, a greater degree of linkage between the binder and the individual wood components is typically achieved. The relatively high pH values ​​described herein are not described in U.S. Pat. No. 8,501,838.

[0035] The precursor further comprises a polypeptide-containing component distributed around the polyol component and the wood component. According to various embodiments, the polypeptide-containing component is typically partially insoluble. The concentration of the polypeptide-containing component is measured based on the dry weight of the binder reaction mixture. The concentration of the polypeptide-containing component can typically range from 20% to 85% by weight, 30% to 80% by weight, or 40% to 65% by weight.

[0036] The polypeptide-containing component may typically include proteins derived from plants. For example, the protein is typically soy flour, soy meal, soy protein, pea protein, wheat gluten, corn protein isolate, or mixtures thereof. In some embodiments, the polypeptide-containing component includes proteins derived from soy flour. Soy flour is typically 40% to 65% or 50% to 60% protein by weight based on the total soy flour added. When the polypeptide-containing component is a mixture such as wheat flour, it can include non-protein components such as carbohydrates. In these examples, the disclosed concentrations of carbohydrates in the binder precursor or its reaction products are independent of the amount of any carbohydrate added from the polyol component. Surprisingly and unexpectedly, it has been found that mixtures containing soy flour produce multi-layer engineered wood products with better properties than corresponding multi-layer engineered wood products formed with components having a higher percentage of protein.

[0037] In certain aspects, when the polypeptide-containing ingredient comprises soy flour, the soy flour may have a protein dispersibility index of at least 60. For example, the protein dispersibility index of soy flour typically ranges from 70 to 95, e.g., a PDI of 80 to 90. When it is desirable to screen the polypeptide-containing ingredient by size, the ingredient is typically selected to pass through a screen size of from a 100 mesh screen to a 635 mesh screen or a 100 mesh screen to a 400 mesh screen, e.g., a screen size of typically from 150 to 325.

[0038] In certain embodiments, the multi-layer engineered wood precursor mixture may include sodium sulfite, sodium bisulfite, sodium metabisulfite, or mixtures thereof. When added, the sodium sulfite, sodium bisulfite, sodium metabisulfite, or mixtures thereof range from 1% to 10% by weight, or 1% to 5% by weight, based on the dry weight of the binder reaction mixture. The inclusion of sodium sulfite, sodium bisulfite, sodium metabisulfite, or mixtures thereof may help increase the strength of the resulting multi-layer engineered wood product. For example, they may help increase the modulus of rupture, modulus of elasticity, or both, of the multi-layer engineered wood product compared to a corresponding multi-layer engineered wood product that does not include sodium sulfite, sodium bisulfite, sodium metabisulfite, or mixtures thereof. However, in certain embodiments, the inclusion of sodium sulfite, sodium bisulfite, sodium metabisulfite, or mixtures thereof may increase the sulfur content of the multi-layer engineered wood product, which may be detrimental in certain applications.

[0039] According to various embodiments, the aqueous portion may further comprise borax. The term borax is often used for many closely related mineral or chemical compounds that differ in their water of crystallization content. Examples of suitable borax compounds include sodium tetraborate decahydrate (or sodium tetraborate octahydrate), sodium tetraborate pentahydrate, anhydrous sodium tetraborate, and mixtures thereof. When added, borax typically ranges from 1% to 15% or 3% to 6% by weight based on the dry weight of the binder reaction mixture.

[0040] According to various embodiments, the binder reaction mixture may further include sodium trimetaphosphate, which is typically added to the binder reaction mixture in a range of 0.1% to 10%, or 0.4% to 0.9%, or even 0.6% to 0.8% by weight based on the dry weight of the binder reaction mixture. In some embodiments, a preferred range is 0.7% to 0.9% by weight based on the dry weight of the binder reaction mixture. Without being limited to any theory, it is understood that the inclusion of sodium trimetaphosphate may be useful in allowing higher levels of carbohydrate to be added to the binder reaction mixture. In addition, it is believed that the inclusion of sodium trimetaphosphate is typically useful for increasing at least the internal bond strength in engineered wood produced using the binder reaction mixture. It is also believed that the inclusion of sodium trimetaphosphate is typically useful for improving the thickness swelling % value of engineered wood using the binder reaction mixture.

[0041] As mentioned above, the binder is substantially free of urea-formaldehyde binder or methylene diphenyl diisocyanate binder or polyamide-epichlorohydrin binder. Thus, the precursor described herein is also free of urea-formaldehyde binder or methylene diphenyl diisocyanate binder or polyamide-epichlorohydrin binder. For example, the mixture may typically contain less than 5% by weight of urea-formaldehyde or polyamide-epichlorohydrin binder, or may be substantially free (e.g., less than 1% by weight) of urea-formaldehyde or methylene diphenyl diisocyanate or polyamide-epichlorohydrin binder.

[0042] The moisture content of the mixture of binder reaction mixture and multiple wood components before curing used to form each of the first surface layer 102, second surface layer 104, and core layer 106 is typically carefully controlled. For example, the moisture content of the mixture of wood components and binder reaction mixture in each of layers 102, 104, and 106 is typically at least 9% by weight, or in the range of 9% to 20% by weight, or 9.5% to 16% by weight, or 10% to 15% by weight, and preferably the moisture content of the mixture of wood components and binder reaction mixture in each layer is at least 9% by weight, at least 9.5% by weight, at least 11% by weight, and less than 16% by weight, or less than 15% by weight. In some examples, the moisture content of the mixture of wood components and binder reaction mixture of the core layer 106 is at least 9% by weight, and the moisture content of each of the mixtures of wood components and binder reaction mixture of the first surface layer 102 and the second surface layer 104 is individually greater than the moisture content of the mixture of wood components and binder reaction mixture of the core layer 106. In some further examples, the moisture content of the mixture of wood components and binder reaction mixture of the core layer 106 is at least 9% by weight, and greater than the moisture content of each of the first surface layer 102 and the second surface layer 104. In some further examples, the moisture contents of the mixture of wood components and binder reaction mixture of the first surface layer 102, the second surface layer 104, and the core layer 106 are within 5% by weight of each other, within 3% by weight of each other, within 1% by weight of each other, or similar or even the same. The moisture content can affect the ability to disperse the components of the binder reaction mixture around the wood components. The moisture content is typically adjusted, for example, by increasing or decreasing the moisture content in the binder reaction mixture. For example, if the moisture content in the wood is low, the moisture content in the binder reaction mixture is typically increased to bring the total moisture content of the binder reaction mixture and the mixture of multiple wood components to the desired level. In some aspects, moisture is typically added to the mixture of wood components and binder reaction mixture by spraying water onto the binder reaction mixture distributed on the wood components. However, in certain aspects, water may simply be added to the polyol component before the polyol component is applied to the wood components.This can provide better distribution of moisture throughout the binder reaction mixture and the wood component mixture.

[0043] As used herein, moisture content refers to the total moisture content (by weight percent) of the mixture of wood components and binder reaction mixture. This is the case in the examples herein, where "W T Alternatively, the moisture content of the mixture of wood components and binder reaction mixture is referred to as the "mat moisture content." As a further alternative, the total moisture content of the wood components and binder reaction mixture is referred to as the "moisture content of the binder reaction mixture applied to a plurality of wood components."

[0044] In some examples, any of the first surface layer 102, the second surface layer 104, or the core layer 106 may individually include a tackifier. Examples of suitable tackifiers may include sucrose, rosin, starch, molasses, or mixtures thereof. If added, the tackifier may range from 1% to 10%, 2% to 8%, or 5% to 7% by weight of the binder reaction mixture of the first surface layer 102, the second surface layer 104, or the core layer 106, respectively. When the polyol component includes glycerol or an oligomer of glycerol, the inclusion of a tackifier may help improve the tack of the binder reaction mixture, thereby complementing the favorable thickness swelling properties provided by glycerol. When the polyol includes fructose, sucrose, or glucose (or mixtures thereof), the tack of the binder reaction mixture may be sufficient and may not require additional tackifier.

[0045] The multi-layer engineered wood products described herein are typically made or manufactured according to a number of suitable methods. As an example, a method may include: (a) mixing a polyol component, water, and a base, and optionally a tackifier, optionally borax, optionally sodium sulfite, optionally sodium bisulfite, optionally sodium metabisulfite, or any mixture thereof, to produce a first mixture.

[0046] After the first mixture of (a) is formed, the method may further include (b) mixing the first mixture produced in (a) with a plurality of wood components to obtain a second mixture. To help achieve a uniform blend, the mixing in (b) is typically performed by spraying the polyol component and base onto the plurality of wood components. The spraying and mixing may typically be performed for a time period ranging from 1 minute to 60 minutes, or from 1 minute to 10 minutes.

[0047] After the mixing in (b) has been performed, the method further comprises (c) mixing the mixture produced in (b) with a polypeptide-containing component to form a third mixture. The polypeptide-containing component at this stage is typically in powder form. It has been found that the properties of the resulting multi-layer engineered wood product (e.g., modulus of rupture, modulus of elasticity, % thickness swelling, or a combination thereof) are better when the polypeptide-containing component is in powder form as opposed to dispersed form.

[0048] In examples involving fructose, sucrose, or glucose (or mixtures thereof) (e.g., high fructose corn syrup), the first mixture obtained in (a) is typically used immediately before carrying out step (b). However, the first mixture obtained in (a) can also be aged, for example, for at least 1 hour, or at least 12 hours. And surprisingly and unexpectedly, it has been found that the mixture obtained in (a) can be effectively used when aged for 26 hours or more before carrying out (b), for example, the first mixture is typically aged for at least 50 hours, at least 120 hours, at least 360 hours, at least 1400 hours, at least 2000 hours, 26 hours to 1400 hours, or 50 hours to 360 hours before carrying out (c). These times are typically shortened by heating the mixture. The step in (c) is typically carried out for at least 1 minute, for example in the range of 1 minute to 60 minutes or 1 minute to 10 minutes.

[0049] The third mixture formed during step (c) exhibits adhesive properties comparable to or improved over alternative binder systems (e.g., those using urea-formaldehyde binders or methylene diphenyl diisocyanate binders or polyamide-epichlorohydrin binders, or those containing lower moisture content). Tack is an adhesive property that gives the materials being bonded the ability to lightly stick together with gentle pressure. Tack is typically an important property for maintaining the shape and distribution of wood fibers within the mat during initial formation throughout the particleboard manufacturing process. Increasing the polyol component portion of the aqueous portion of the binder reaction mixture during step (b) appears to visually improve the tack of the resulting binder reaction mixture. Adding a tackifier can also help increase adhesive properties.

[0050] Steps (a)-(c) create a green structure (resined finished product) of one of the first surface layer 102, the second surface layer 104, or the core layer 106. Steps (a)-(c) are typically repeated to generate green structures of the second surface layer 104 and the core layer 106, if desired. In some embodiments, at least one layer may not include the aforementioned binders and may instead include a urea-formaldehyde resin binder or a methylene diphenyl diisocyanate binder or a polyamide-epichlorohydrin-based binder. The green structures formed from each series of steps (a)-(c) are stacked. The adhesive strength of the green structures helps to allow the green structures to remain relatively intact when stacked. Once the stack (mat) is formed, the stack is then cured. Curing may include hot pressing the stack. Hot pressing may be performed with a pressure of at least 0.34 N / mm 2 and 3.44N / mm 2 Below, 0.34N / mm 2 ~3.1 0.34N / mm 2 , or 0.20N / mm 2 ~2.75N / mm 2The pressure used is typically selected, at least in part, to achieve a particular thickness of the multi-layer engineered wood product. In addition to the pressure, the platens of the press used in the hot press are heated to a temperature in the range of at least 100°C, e.g., at least 120°C, or at least 200°C, in the range of 100°C to 250°C, or in the range of 120°C to 200°C, or in the range of 120°C to 190°C, or in the range of 100°C to 250°C, in the range of 120°C to 225°C, or at least 187°C. In some examples, the platens are heated to less than 315°C, preferably less than 230°C, less than 225°C, less than 200°C, less than 190, or less than 180°C.

[0051] Typically, the platen is heated to a temperature of at least 100° C., for example, at least 120° C., or at least 187° C., in the range of 100° C. to 250° C., in the range of 180° C. to 220° C., or in the range of 120° C. to 190° C. In some examples, the platen is heated to achieve a cure temperature of at least 198° C., at least 204° C., at least 246° C., in the range of 198° C. to 232° C., in the range of 204° C. to 226° C., in the range of 210° C. to 221° C., less than 315° C., or preferably less than 230° C. Typically, the platen is heated to achieve a cure temperature of 204° C. to 248° C., in the range of 210° C. to 243° C., in the range of 210° C. to 226° C., at least 215° C., or at least 251° C.

[0052] The method may further comprise a "cold pressing" step, which may occur before or after the hot pressing. Cold pressing may occur at ambient temperature.

[0053] When heated above 100°C, water is converted to steam, which creates internal gas pressure within the product, which may ultimately cause the wood product to fail to maintain structural integrity (e.g., to break down). This problem is particularly present when urea-formaldehyde based binders are used. Surprisingly and unexpectedly, the binders disclosed herein allow engineered wood products to be cured at high temperatures (by heating the platen to high temperatures) and high mat moisture contents (both within the respective ranges described herein) without breaking down the product.

[0054] Any of the swelling retarding components described herein are typically added to the wood component at any time during the process in steps (a), (b), (c), or a combination thereof. Similarly, sodium sulfite, sodium bisulfite, sodium metabisulfite, or mixtures thereof are typically added to the process in steps (a), (b), (c), or a combination thereof. Similarly, sodium trimetaphosphate is typically added to the process in steps (a), (b), (c), or a combination thereof.

[0055] The wood component is typically mixed with the aqueous portion to form a first mixture before the wood component is mixed with the polypeptide component, as outlined in steps (a), (b), and (c). Alternatively, the wood component is typically mixed with the polypeptide component before being mixed with any of the components of the aqueous portion. However, performing at least steps (a), (b), and (c) in sequential order has been found to improve properties in multi-layer engineered wood products. Specifically, the modulus of rupture, modulus of elasticity, and thickness swelling % of the resulting multi-layer engineered wood product are improved compared to the corresponding multi-layer engineered wood product formed in a different order. Without intending to be bound by any theory, it is believed that performing these steps in sequence helps achieve uniform spreading of the polyol component onto the wood component. Furthermore, the polyol component is at least partially embedded in the wood component by the base that forms openings in the wood component. Thus, when the polypeptide-containing component contacts the polyol component, the reaction between the two is uniform. It has been found that including a polypeptide-containing component in one step with the wood component, base, (and optionally borax, optionally sodium sulfite, optionally sodium bisulfite, optionally sodium metabisulfite or any mixture thereof) and polyol component reduces the % thickness swell, modulus of rupture and elastic modulus of the resulting multi-layer engineered wood product.

[0056] Working example Various aspects of the present disclosure may be better understood by reference to the following working examples, which are provided by way of illustration. The present disclosure is not limited to the working examples given herein. Unless otherwise indicated to the contrary, the mixtures of wood components and binder reaction mixtures used in the examples had a moisture content (e.g., mat moisture content before curing) of nine percent by weight (9 wt%) to seventeen percent by weight (17 wt%), preferably 9 percent by weight to 15 percent by weight. In addition, unless ... were selected from the group consisting of % NaOH, % Prolia 200 / 90, % crude glycerol, % Na 2 SO 3, % Borax, % IsoClear 42, % MgO, etc. refer to the dry weight % of the indicated component based on the total dry weight of the binder reaction mixture.

[0057] [Table 1]

[0058] Example 1: Preparation of binder and multi-layer processed particleboard A pre-weighed amount of water (W A ) with a 50% alkaline solution, such as NaOH solution, to form a dilute alkaline solution containing NaOH, which is cooled to 25-30°C. If present, a polyol component, such as IsoClear 42 high fructose corn syrup solution, is added to the dilute alkaline solution containing NaOH, which is cooled to 25-30°C. 2 SO 3 In a further embodiment, NaOH is slowly added to the dilute NaOH solution along with optional ingredients such as borax, MgO, and borax to form the aqueous portion. 2 SO 3 The W and Borax are first combined, then the glycerol containing components are added, and finally the NaOH is added to form the aqueous portion. Place the aqueous portion of the binder reaction mixture on a shaker for 5 minutes. A For the third mixture, the total moisture content of the binder and wood particles (WP) is targeted to be 11%. The ratio of dry binder to dry wood particles is 13.1:100 (e.g., 13.1 parts per 100 parts dry WP). The moisture content added to the aqueous portion of the binder reaction mixture is calculated based on the moisture content of the third mixture, the moisture of the wood particles, and the moisture content of the total binder.

[0059] The moisture content of the wood particles and polypeptides is measured by Mettler Toledo moisture balance at 130°C. A is determined according to Equation 1. W A =W T -W WP -W BF (Formula 1) W A : Water added to the aqueous portion of the binder reaction mixture WT : Total moisture of the third mixture W WP : Water in wood particles W BF: Water, NaOH, optional Borax, optional IsoClear 42, optional MgO, optional Na in Polyol Component 2 SO 3 , and water in the binder component containing Prolia 200 / 90

[0060] According to Protocol 1A, water, polyol component, NaOH, and optional Na 2 SO 3 , and Borax (Resin 1) are blended and sprayed onto the wood particles (WP) and mixed for 2-5 minutes or 5 minutes to allow for thorough dispersion. Following this, the polypeptide-containing component (and MgO, if added) in powder form (Resin 2) is added and the mixture is then blended for 0.2-2 minutes or 2 minutes. This process is repeated twice to form a finished resinated surface and core which are then stacked to form a mat.

[0061] Alternatively, follow Protocol 1B by first blending the polypeptide-containing component with wood particles (and MgO, if added) (Resin 2) for 0.2-2 minutes. This is followed by blending the polyol component, NaOH, water, and optional Na 2 SO 3 , and Borax (Resin 1) are blended and then sprayed onto wood particles which are pre-treated with Resin 2 and mixed for 1 minute or 0.2-2 minutes to allow for good dispersion. The two mixtures are then combined and blended for 2 minutes. This process is repeated twice to form a finished resinized face and core which are then formed into a 3-ply mat.

[0062] A 91.4 cm x 91.4 cm Nordberg hot press utilizing a Pressman control system is set at 174°C to maintain working conditions in the range of 150-177°C. Typical platen temperature is 165°C. The above binder and wood particle combination is mixed uniformly for 2-10 minutes or 5-10 minutes in a Littleford horizontal continuous mixer or equivalent device available from B&P Littleford (Saginaw, MI). The resinized surface finished product is then transferred to a forming box, which is placed on a release paper lined coal plate placed on a portable table. The finished product is then uniformly distributed across the bottom of the forming box. The same procedure is repeated to form the core layer and the second surface layer. A mat of the three layer finished product is then uniformly formed in the forming box until the desired thickness is achieved. A 76.2 cm x 76.2 cm metal color frame is then uniformly placed inside the forming box and on top of the mat. A metal cover is then placed into the forming box and used to gently press the collar and wood pieces together to create the mat that will be pressed. The forming box is then lifted off the bottom caul plate, leaving the mat and cover alone. The metal cover is carefully removed and a second release paper liner is placed over the mat, followed by a second caul plate. The entire assembly of the two caul plates with the mat sandwiched between them is then transferred to a hot press.

[0063] Temperature and pressure probes are inserted into the center of the mat to monitor the internal conditions throughout the press cycle. The press platens are then slowly closed to the predetermined distance required to maintain a particleboard thickness in the range of 1.8 cm to 2.16 cm (1.91 cm is the desired measurement). The mat is held for a time (e.g., "soak time") ranging from 30 to 600 seconds, or 145 to 245 seconds, or 90 to 130 seconds, and then the bottom platen is slowly lowered within 240 seconds or 30 seconds to release the pressure within the particleboard. The caul plate and finished particleboard are then placed back on the moving table. The top caul plate is removed to reveal the multi-layered particleboard, which is then placed on a cooling rack. The multi-layered particleboard is removed and conditioned with the appropriate requirements for testing. After conditioning, the multi-layered particleboard is tested for various properties including modulus of rupture (MOR), modulus of elasticity (MOE), thickness swell %, and internal bond strength (IB).

[0064] The binder reaction mixture formulation is shown in Table 1. The board processing parameters are shown in Table 2. Each of boards 1-12 listed in Table 2 included two surface layers and a core layer located therebetween. The surface layers each comprised 20% by weight of the total dry weight basis of the respective board before curing. The core layer comprised 60% by weight of the total dry weight basis of the respective board before curing. As used in Table 2, the data regarding the surface layers of each board describes the first and second surface layers of each board.

[0065] Example 2: Measurement of modulus of rupture (MOR), modulus of elasticity (MOE), thickness swelling %, and internal bond strength (IB) The modulus of rupture, modulus of elasticity, % thickness swelling, and internal bond strength were determined using a modified ASTM D 1037-06a. ASTM D 1037-06a was modified in that the specimens used were conditioned at 50% relative humidity and 21.1°C. For each of the multi-layered particleboards, the modulus of rupture, modulus of elasticity, % thickness swelling, and internal bond strength were determined by taking each multi-layered particleboard having dimensions of 91.44 cm wide x 91.44 cm long, and 2.08 cm thick, respectively, and finally preparing one or more test specimens from the multi-layered particleboards. Preparation of the test specimens included cutting the multi-layered particleboards to prepare sample multi-layered particleboards. The sample multi-layered particleboards were cut to have dimensions of 76.20 cm wide x 76.20 cm long, and 2.08 cm thick.

[0066] Several specimens were made from the sample multi-layered particleboard to determine the modulus of rupture, modulus of elasticity, thickness swelling %, and internal bond strength. Making several specimens helps to illustrate the properties of the multi-layered particleboard in different orientations and positions (including edge effects). To determine the modulus of rupture and modulus of elasticity, nine specimens were made from the sample multi-layered particleboard, each having dimensions of 50.80 cm long (45.72 cm span length) x 7.62 cm wide, and 2.08 cm thick. The modulus of rupture and modulus of elasticity of each specimen were collected and these values ​​were averaged to obtain the modulus of rupture and modulus of elasticity of the multi-layered particleboard. To determine the internal bond strength, 21 specimens were made from the sample multi-layered particleboard, each having dimensions of 5.08 cm long x 5.08 cm wide, and 2.08 cm thick. The internal bond strength of each specimen was collected and these values ​​were averaged to obtain the internal bond strength of the multi-layered particleboard. To determine the % thickness swell, three test specimens, each measuring 15.24 cm long by 15.24 cm wide and 2.08 cm thick, were made from the multi-layered particleboard. The internal bond strength of each specimen was collected and these values ​​were averaged to obtain the % thickness swell of the multi-layered particleboard.

[0067] Example 3: Binder Formulation Three binder formulations were prepared and contained the components listed in Table 1. All weight percentages are based on the dry weight of the binder formulation components.

[0068] [Table 2]

[0069] [Table 3]

[0070] [Table 4] * The board failed to maintain its structure.

[0071] The binder reaction mixture formulations are shown in Table 4. Each of the engineered wood products includes two surface layers and a core layer disposed therebetween, with each layer formed from a respective formula. The method for forming each of the engineered wood products is the same as that used to produce boards 1-12. The surface layers each comprise 20% by weight of the total dry weight basis of each board before curing. The core layer comprises 60% by weight of the total dry weight basis of each board before curing. In each of the engineered wood products, the composition of the surface and core layers is the same (e.g., using the same specified formula) with the expectation that the wood particles in the surface layer have a smaller average particle size than the wood particles in the core layer. The overall density of the engineered wood products is 672.7 kg / m 3 However, smaller wood particles in the surface layer result in a surface layer having a greater density than the core layer. It is expected that the density of the first surface layer, the second surface layer, or both, will be greater than the density of the core layer.

[0072] [Table 5]

[0073] Example 4. [Table 6]

[0074] Example 4 shows that increased soak time, increased press temperature, or both in engineered wood particleboard can result in improved internal bond strength.

[0075] Example 5. [Table 7]

[0076] Example 5 shows that increasing the PDI of a polypeptide-containing component results in improved internal bond strength properties of engineered wood particleboard.

[0077] Example 6. [Table 8]

[0078] Example 6 shows that the particle size of the polypeptide-containing component used (100 mesh vs. 200 mesh) does not significantly affect the internal bond strength of engineered wood particleboard.

[0079] Example 7. [Table 9]

[0080] Example 7 shows that increasing the binder dose amount results in improved internal bond strength in engineered wood particleboard. Example 26 also shows that Protocol 2A with a lower binder dose amount (7 parts per 100 parts dry weight of wood fiber) produced engineered wood particleboard with better internal bond strength in engineered wood particleboard.

[0081] Example 8. [Table 10]

[0082] Example 8 shows that increased GLY content (wt%) results in engineered wood particleboard with improved internal bond strength.

[0083] Example 9. [Table 11]

[0084] Example 9 shows that including IsoClear 42% with GLY provides engineered wood particleboard with acceptable internal bond strength values, however, engineered wood particleboard with acceptable internal bond strength values ​​could be produced without including IsoClear 42%.

[0085] The terms and expressions used are used as terms of description and not of limitation, and there is no intention in the use of such terms and expressions to exclude any equivalents of the features shown and described or portions thereof, but it is recognized that various modifications are possible within the scope of the embodiments of the present invention. Thus, although the present invention has been specifically disclosed by certain embodiments and optional features, it is to be understood that modifications and variations of the concepts disclosed herein may be exercised by those skilled in the art, and such modifications and variations are considered to be within the scope of the embodiments of the present invention.

[0086] Exemplary embodiments. The following exemplary embodiments are provided, the numbering of which should not be construed as designating a level of importance.

[0087] Embodiment 1 is a multi-layer engineered wood product, A first surface layer; A second surface layer; and a core layer disposed between the first surface layer and the second surface layer; At least one of the first surface layer, the second surface layer, and the core layer comprises a plurality of wood components and a reaction product of a binder reaction mixture dispersed about the plurality of wood components, the binder reactant being added in a range of 3 parts to 25 parts per 100 parts dry weight of the plurality of wood components, the moisture content of the mixture of the wood components and the binder reaction mixture being in a range of 9% to 20% by weight, and the binder reaction mixture being an aqueous portion including a polyol component added in an amount ranging from 5% to 65% by weight or 5% to 50% by weight based on the dry weight of the binder reaction mixture, the polyol component being Glycerol, Glycerol oligomers, Optionally, a monosaccharide, Optionally, sucrose, or an aqueous portion, optionally comprising a mixture thereof; a polypeptide-containing component added in the range of 20% by weight to 85% by weight based on the dry weight of the binder reaction mixture, the polypeptide-containing component comprising a vegetable protein; a base in the range of 1 to 15 weight percent based on the dry weight of the binder reaction mixture; Optionally, a tackifier in the range of 0.001 to 1.5 weight percent based on the dry weight of the binder reaction mixture; Optionally, sodium trimetaphosphate in the range of 0.1% to 10% by weight based on the dry weight of the binder reaction mixture; Optionally, in the range of 0.5% to 10% by weight based on the dry weight of the binder reaction mixture of sodium sulfite, sodium bisulfite, sodium metabisulfite, or mixtures thereof; Optionally, borax in the range of 1% to 15% by weight based on the dry weight of the binder reaction mixture.

[0088] Embodiment 2 provides the multi-layer engineered wood product of embodiment 1, wherein the first surface layer and the second surface layer comprise the reaction product of a binder reaction mixture dispersed around the plurality of wood components, and the core layer does not comprise a binder reaction mixture dispersed around the plurality of wood components.

[0089] Embodiment 3 provides the multi-layer engineered wood product of embodiment 2, wherein the first surface layer and the second surface layer comprise a binder reaction mixture, and the mixture of wood components and binder reaction mixture of the first surface layer and the mixture of wood components and binder reaction mixture of the second surface layer comprise similar chemical compositions and optionally moisture contents of less than 1% of each other.

[0090] Embodiment 4 provides the multi-layer engineered wood product of embodiment 1, wherein the first surface layer and the second surface layer comprise a binder reaction mixture, and the mixture of wood components and binder reaction mixture of the first surface layer and the mixture of wood components and binder reaction mixture of the second surface layer comprise different chemical compositions and optionally less than 1% moisture content from each other.

[0091] Embodiment 5 provides the multi-layer engineered wood product of any one of embodiments 1-4, wherein the core layer does not include a reaction product of the binder reaction mixture, but includes a urea-formaldehyde binder, or a methylene diphenyl diisocyanate binder, or a polyamide-epichlorohydrin based binder.

[0092] Embodiment 6 provides the multi-layer engineered wood product of embodiment 1, wherein the first surface layer, the second surface layer, and the core layer comprise the reaction product of a binder reaction mixture dispersed about the plurality of wood components.

[0093] Embodiment 7 provides the multi-layer engineered wood product of embodiment 1, wherein the core layer comprises the reaction product of a binder reaction mixture dispersed about the plurality of wood components, and the first surface layer, the second surface layer, or both do not comprise the binder reaction mixture.

[0094] Embodiment 8 provides the multi-layer engineered wood product of any of embodiments 1-7, wherein the polypeptide-containing component comprises soy flour, soy meal, pea protein, soy protein, or a mixture thereof.

[0095] Embodiment 9 provides the multi-layer engineered wood product of embodiment 6, wherein at least two of the mixture of wood components and binder reaction mixture of the first surface layer, the mixture of wood components and binder reaction mixture of the second surface layer, and the mixture of wood components and binder reaction mixture of the core layer comprise different chemical compositions and, optionally, different moisture contents (e.g., by more than 1% difference).

[0096]

[0023] Embodiment 10 provides the multi-layer engineered wood product of any one of embodiments 6 and 8-9, wherein the mixture of wood components and binder reaction mixture of the first surface layer, the mixture of wood components and binder reaction mixture of the second surface layer, and the mixture of wood components and binder reaction mixture of the core layer each comprise a different chemical composition and, optionally, a different moisture content (e.g., a difference of more than 1%).

[0097] Embodiment 11 provides the multi-layer engineered wood product of any one of embodiments 1 to 10, wherein the moisture content of the mixture of wood components and binder reaction mixture is in the range of 9.0% to 16% by weight.

[0098] Embodiment 12 provides the multi-layer engineered wood product of any one of embodiments 1 to 11, wherein the aqueous portion further comprises from 1% to 12% by weight of a base, based on the dry weight of the binder reaction mixture.

[0099] Embodiment 13 provides the multi-layer engineered wood product of embodiments 1-12, wherein the pH of the aqueous portion is greater than 9 (eg, 9-14).

[0100] Embodiment 14 provides the multi-layer engineered wood product of any one of embodiments 1 to 13, wherein the pH of the aqueous portion is from 9 to 13.5.

[0101] Embodiment 15 provides the multi-layer engineered wood product of any one of embodiments 1-14, wherein the pH of the aqueous portion is 10-13 (eg, 11-13).

[0102] Embodiment 16 provides the multi-layer engineered wood product of any one of embodiments 1-15, wherein the polyol component ranges from 10% to 50% by weight (e.g., 20% to 50% by weight) based on the dry weight of the binder reaction mixture.

[0103] Embodiment 17 provides the multi-layer engineered wood product of any one of embodiments 1-16, wherein the polyol component is in the range of 20% to 40% by weight (e.g., 20% to 30% by weight) based on the dry weight of the binder reaction mixture.

[0104] Embodiment 18 provides the multi-layer engineered wood product of any one of embodiments 1-17, wherein the sodium sulfite, sodium bisulfite, sodium metabisulfite, or mixtures thereof ranges from 0.5% to 10% by weight, based on the dry weight of the binder reaction mixture.

[0105] Embodiment 19 provides the multi-layer engineered wood product of any one of embodiments 1-18, wherein the binder reaction mixture comprises less than 5% by weight of a urea-formaldehyde, methylene diphenyl diisocyanate, or polyamide-epichlorohydrin based binder, or mixtures thereof.

[0106] Embodiment 20 provides the multi-layer engineered wood product of any one of embodiments 1-19, wherein the binder reaction mixture is substantially free of (e.g., contains less than 1% by weight of) urea-formaldehyde, methylene diphenyl diisocyanate, or polyamide-epichlorohydrin based binders, or mixtures thereof.

[0107] Embodiment 21 provides the multi-layer engineered wood product of any one of embodiments 1 to 20, wherein the binder reaction mixture of each individual layer is added in the range of 5 parts to 20 parts per 100 parts dry weight of the plurality of wood components of each of the first surface layer, the second surface layer, the core layer, or combinations thereof.

[0108] Embodiment 22 provides the multi-layer engineered wood product of any one of embodiments 1-21, wherein the binder reaction mixture of each individual layer is added in the range of 6 parts to 17 parts or 8 parts to 17 parts per 100 parts dry weight of the plurality of wood components of each of the first surface layer, the second surface layer, the core layer, or combinations thereof.

[0109] Embodiment 23 provides the multi-layer engineered wood product of any one of embodiments 1 to 22, wherein the borax is in the range of 3% to 6% by weight based on the dry weight of the binder reaction mixture.

[0110] In embodiment 24, the modulus of rupture of the multi-layer processed wood product is 10 N / mm 2 ~20N / mm 2 The multi-layer engineered wood product of any one of embodiments 1 to 23 is provided, wherein the multi-layer engineered wood product is in the range of:

[0111] In embodiment 25, the modulus of rupture of the multi-layer processed wood product is 12 N / mm 2 ~17N / mm 2 The multi-layer engineered wood product of any one of embodiments 1 to 24 is provided, wherein the multi-layer engineered wood product is in the range of:

[0112] Embodiment 26 provides the multi-layer engineered wood product of any one of embodiments 1 to 25, wherein the % thickness swelling of the multi-layer engineered wood product measured after immersion of the multi-layer engineered wood product in water for 2 hours is in the range of 5% to 45%.

[0113] Embodiment 27 provides the multi-layer engineered wood product of any one of embodiments 1 to 26, wherein the percent thickness swelling of the multi-layer engineered wood product measured after immersing the multi-layer engineered wood product in water for 2 hours is in the range of 5% to 40% (e.g., 5% to 35%, or 10% to 30%).

[0114] In the twenty-eighth embodiment, the elastic modulus of the multi-layer processed wood product is 1,378 N / mm 2 ~2,413N / mm 2 The multi-layer engineered wood product of any one of embodiments 1 to 27 is provided, wherein the multi-layer engineered wood product is in the range of:

[0115] In the twenty-ninth embodiment, the elastic modulus of the multi-layer processed wood product is 1,930 N / mm 2 ~2,137N / mm 2 (For example, 1,965N / mm 2 ~2,033N / mm 2 The multi-layer engineered wood product of any one of embodiments 1-28 is provided, wherein the multi-layer engineered wood product is in the range of

[0116] In embodiment 30, the internal bond strength of the multi-layer engineered wood product is 0.1 N / mm 2 ~0.83N / mm 2 The multi-layer engineered wood product of any one of embodiments 1 to 29 is provided, wherein the multi-layer engineered wood product is in the range of:

[0117] In embodiment 31, the internal bond strength of the multi-layer engineered wood product is 0.2 N / mm 2 ~0.5N / mm 2 The multi-layer engineered wood product of any one of embodiments 1 to 30 is provided, wherein the multi-layer engineered wood product is in the range of:

[0118] Embodiment 32 provides the multi-layer engineered wood product of any one of embodiments 1 to 31, wherein the moisture content of each of the binder reaction mixtures of each of the first surface layer, the second surface layer, and the core layer is in the range of 9% by weight to 20% by weight.

[0119] Embodiment 33 provides the multi-layer engineered wood product of any one of embodiments 1 to 32, wherein the moisture content of each of the binder reaction mixtures of each of the first surface layer, the second surface layer, and the core layer is in the range of 9.5% to 16% by weight.

[0120] Embodiment 34 provides the multi-layer engineered wood product of any one of embodiments 1 to 33, wherein the moisture content of each of the binder reaction mixtures of each of the first surface layer, the second surface layer, and the core layer is in the range of 9.5% to 11% by weight.

[0121] In a thirty-fifth embodiment, the density of the multi-layer engineered wood product is 0.2 g / cm 3 ~0.8g / cm 3 or 0.60 g / cm 3 ~0.75g / cm 3 The multi-layer engineered wood product of any one of embodiments 1 to 34 is provided, wherein the multi-layer engineered wood product is in the range of:

[0122] Embodiment 36 provides the multi-layer engineered wood product of any one of embodiments 32-35, wherein the reaction product of the binder reaction mixture is uniformly distributed about the plurality of wood components.

[0123] Embodiment 37 provides the multi-layer engineered wood product of any one of embodiments 1 to 37, wherein the sodium trimetaphosphate is in the range of 0.4% to 0.9% by weight based on the dry weight of the binder reaction mixture.

[0124] Embodiment 38 provides the multi-layer engineered wood product of any one of embodiments 1 to 37, wherein the sodium trimetaphosphate is in the range of 0.6% to 0.8% by weight based on the dry weight of the binder reaction mixture.

[0125] Embodiment 39 is a method of making a multi-layer engineered wood product, the method comprising: (a) A polyol component comprising: Glycerol, Glycerol oligomers, monosaccharide, Sucrose, or Polyols, including mixtures thereof; Water, A base, Optionally, a tackifier; and Optionally, sodium trimetaphosphate; and Optionally, sodium sulfite, sodium bisulfite, sodium metabisulfite, or mixtures thereof; Optionally, mixed with borax, forming a first mixture; (b) mixing the first mixture produced in (a) with a plurality of wood components to obtain a second mixture, or mixing the plurality of wood components with a polypeptide-containing component that includes a vegetable protein to obtain a third mixture; (c) mixing the second mixture produced in (b) with a polypeptide-containing component comprising vegetable protein to form a fourth mixture, or mixing the third mixture produced in (b) with the first mixture produced in (a) to form a fifth mixture to form a first multi-layer engineered wood precursor; (d) repeating (a)-(c) at least once to form a second multi-layer engineered wood precursor; (e) stacking the first multi-layered engineered wood precursor and the second multi-layered engineered wood precursor with a third multi-layered engineered wood precursor, the third multi-layered engineered wood precursor being optionally formed according to (a) to (c); (f) curing the first multi-layer engineered wood precursor, the second multi-layer engineered wood precursor, and the third multi-layer engineered wood precursor.

[0126] Embodiment 40 provides the method of embodiment 39, further comprising mixing a plurality of wood components with the swelling retarding component.

[0127] Embodiment 41 provides the method of any one of embodiments 39 or 40, wherein the polyol component ranges from 5% to 65% or 5% to 50% by weight, based on the dry weight of the first mixture.

[0128] Embodiment 42 provides the method of any one of embodiments 39-41, wherein the mixing in (b) comprises spraying the first mixture onto the plurality of wood components.

[0129] Embodiment 43 provides the method of any one of embodiments 39 to 42, wherein the polypeptide-containing component of (c) is in powder form.

[0130] Embodiment 44 provides the method of any one of embodiments 39-43, further comprising mixing sodium sulfite, sodium bisulfite, sodium metabisulfite, or mixtures thereof with (a), (b), (c), or combinations thereof.

[0131] Embodiment 45 provides the method of any one of embodiments 39-44, wherein the first mixture produced in (a) is aqueous and the polyol component is in the range of 20% to 50% by weight, based on the dry weight of the first mixture.

[0132] Embodiment 46 provides the method of any one of embodiments 39-45, wherein the first mixture produced in (a) is aqueous and the polyol component is in the range of 20% to 30% by weight, based on the dry weight of the first mixture.

[0133] Embodiment 47 provides the method of any one of embodiments 39 to 46, wherein the first mixture produced in (a) is aqueous and comprises 1% to 15% by weight of a base based on the dry weight of the first mixture, and the pH of the second mixture or the third mixture produced in (b) is greater than 10.

[0134] Embodiment 48 provides the method of any one of embodiments 39 to 47, wherein the polypeptide-containing component comprises soy flour, soy meal, soy protein, pea protein, wheat gluten, corn protein isolate, or a mixture thereof, in the range of 20% to 85% by weight based on the dry weight of the first mixture.

[0135] Embodiment 49 provides the method of any one of embodiments 39 to 48, wherein the polypeptide-containing component comprises soy flour, wheat gluten, corn protein isolate, or a mixture thereof, in the range of 30% to 80% by weight based on the first mixture.

[0136] Embodiment 50 provides the method of any one of embodiments 39-49, wherein the polypeptide-containing component comprises soy flour, the soy flour being 40% to 65% protein by weight based on the total soy flour added.

[0137] Embodiment 51 provides the method of any one of embodiments 39 to 50, wherein the polypeptide-containing component comprises soy flour and is in the range of 20% to 85% by weight, based on the dry weight of the first mixture.

[0138] Embodiment 52 provides the method of any one of embodiments 39-51, wherein the mixture produced by (a), (b), (c), or combinations thereof, is substantially free (e.g., less than 1 wt. %) of urea-formaldehyde, methylene diphenyl diisocyanate, or polyamide-epichlorohydrin binders, or mixtures thereof.

[0139] Embodiment 53 provides the method of any one of embodiments 39-52, wherein the mixture produced by (a), (b), (c), or combinations thereof, further comprises sodium sulfite, sodium bisulfite, sodium metabisulfite, or mixtures thereof.

[0140] Embodiment 54 provides the method of any one of embodiments 39-53, wherein the mixture produced by (a), (b), (c), or a combination thereof, further comprises borax, e.g., sodium tetraborate decahydrate (or sodium tetraborate octahydrate), sodium tetraborate pentahydrate, and / or anhydrous sodium tetraborate.

[0141] Embodiment 55 provides the method of embodiment 54, wherein the borax is in the range of 1% to 15% by weight based on the dry weight of the first mixture.

[0142] Embodiment 56 provides the method of any one of embodiments 53 or 54, wherein the borax is in the range of 3% to 6% by weight, based on the dry weight of the first mixture.

[0143] Embodiment 57 provides the method of any one of embodiments 39-56, wherein the curing in (f) is conducted at a temperature of 100° C. to 250° C. (e.g., at least 198° C., at least 204° C., at least 246° C., in the range of 198° C. to 232° C., 204° C. to 226° C., 210° C. to 221° C., less than 315° C., or preferably less than 230° C., or, for example, in the range of 204° C. to 248° C., 210° C. to 243° C., 210° C. to 226° C., at least 215° C., or at least 251° C.).

[0144] Embodiment 58 provides the method of any one of embodiments 39-57, wherein the sodium trimetaphosphate is in the range of 0.1% to 10% by weight, based on the dry weight of the first mixture.

[0145] Embodiment 59 provides the method of any one of embodiments 39 to 58, wherein the sodium trimetaphosphate is in the range of 0.6% to 0.8% by weight, based on the dry weight of the first mixture.

[0146] Embodiment 60 provides the method of any one of embodiments 39-59, wherein the sodium trimetaphosphate is in the range of 0.1% to 1% by weight, based on the dry weight of the first mixture.

[0147] Embodiment 61 provides the multi-layer engineered wood product of any one of embodiments 1 to 38 or the method of any one of embodiments 39 to 60, wherein the base comprises NaOH, KOH, magnesium oxide, or a mixture thereof.

[0148] Embodiment 62 provides the multi-layer engineered wood product of any one of embodiments 1 to 38 and 61 or the method of any one of embodiments 39 to 61, wherein the base comprises NaOH.

[0149] Embodiment 63 provides the multi-layer engineered wood product of any one of embodiments 1-38 and 61-62, or the method of any one of embodiments 39-62, wherein the tackifier comprises sucrose, rosin, starch.

[0150] Embodiment 64 provides the multi-layer engineered wood product of any one of embodiments 1-38 and 61-63, or the method of any one of embodiments 39-64, wherein the polypeptide-containing component comprises vegetable protein, soy flour, linseed flour, flaxseed flour, cottonseed flour, canola flour, sunflower flour, peanut flour, lupin flour, pea flour, corn protein, and mixtures thereof.

[0151] Embodiment 65 provides the multi-layer engineered wood product of any one of embodiments 1-38 and 61-64, or the method of any one of embodiments 39-64, wherein the polypeptide-containing component comprises soy flour.

[0152] Embodiment 66 provides the multi-layer engineered wood product of any one of embodiments 1 to 38 and 61 to 65, or the method of any one of embodiments 39 to 65, wherein the polypeptide-containing component comprises soy flour, and the soy flour comprises 40% to 65% by weight protein based on the total soy flour added.

[0153] Embodiment 67 provides the multi-layer engineered wood product or method of embodiment 66, wherein the polypeptide-containing component comprises soy flour, and the soy flour is from 20% to 85% by weight of the binder reaction mixture on a dry weight basis.

[0154] Embodiment 68 provides the multi-layer engineered wood product of any one of embodiments 1-38 and 61-67, or the method of any one of embodiments 39-67, wherein the soy flour is 30% to 80% by weight of the dry weight of the binder reaction mixture.

[0155] Embodiment 69 provides the multi-layer engineered wood product of any one of embodiments 1-38 and 61-69, or the method of any one of embodiments 39-63, wherein the soy flour has a Protein Dispersibility Index (PDI) of at least 60.

[0156] Embodiment 70 provides the multi-layer engineered wood product of any one of embodiments 1-38 and 61-69, or the method of any one of embodiments 39-69, wherein the soy flour has a Protein Dispersibility Index (PDI) in the range of 70 to 95, such as a PDI of 80 to 90.

[0157] Embodiment 71 provides the multi-layer engineered wood product of any one of embodiments 1-38 and 61-70, or the method of any one of embodiments 39-70, wherein the polypeptide-containing component is capable of passing through a screen size between a 100 mesh screen and a 635 mesh screen.

[0158] Embodiment 72 provides the multi-layer engineered wood product of any one of embodiments 1-38 and 61-41, or the method of any one of embodiments 39-71, wherein the polypeptide-containing component is capable of passing through a screen size between 100 mesh screen and 400 mesh screen, for example, a screen size between 150 and 325.

[0159] Embodiment 73 provides the multi-layer engineered wood product of any one of embodiments 1-38 and 61-72, or the method of any one of embodiments 39-72, wherein the plurality of wood components comprises one or more strands, one or more particles, one or more fibers, or a mixture thereof.

[0160] Embodiment 74 provides the multi-layer engineered wood product of any one of embodiments 1-38 and 61-73, or the method of any one of embodiments 39-73, wherein the polyol component comprises glucose syrup, high fructose corn syrup, or a mixture thereof.

[0161] Embodiment 75 provides the multi-layer engineered wood product of any one of embodiments 1 to 38 and 61 to 74, or the method of any one of embodiments 39 to 74, wherein the mixture of wood component and binder reaction mixture of the core layer has a moisture content of at least 9% by weight, and the moisture contents of the mixture of wood component and binder reaction mixture of the first surface layer and the second surface layer are each less than the moisture content of the mixture of wood component and binder reaction mixture of the core layer.

[0162] Embodiment 76 provides the multi-layer engineered wood product of any one of embodiments 1 to 38 and 61 to 74, or the method of any one of embodiments 39 to 74, wherein the mixture of wood component and binder reaction mixture of the core layer has a moisture content of at least 9% by weight, and the moisture contents of the mixture of wood component and binder reaction mixture of the first surface layer and the second surface layer are each less than the moisture content of the mixture of wood component and binder reaction mixture of the core layer.

[0163] Embodiment 77 provides the multi-layer engineered wood product of any one of embodiments 1-38 and 61-76, or the method of any one of embodiments 39-76, wherein the polyol component comprises fructose, sucrose, or glucose, or a mixture thereof.

[0164] Embodiment 78 provides the multi-layer engineered wood product of any one of embodiments 1-38 and 61-77, or the method of any one of embodiments 39-77, wherein the multi-layer engineered wood product comprises particleboard, medium density fiberboard, high density fiberboard, oriented strand board, multi-layer engineered wood flooring, or a combination thereof.

[0165] Embodiment 79 provides the multi-layer engineered wood product of any one of embodiments 1-38 and 61-78 or the method of any one of embodiments 39-78, wherein the multi-layer engineered wood product comprises particle board.

[0166] Embodiment 80 provides the multi-layer engineered wood product of any one of embodiments 1-38 and 61-79, wherein the viscosity of the aqueous portion at 25° C. ranges from 5 cP to 1000 cP.

[0167] Embodiment 81 provides the multi-layer engineered wood product of any one of embodiments 1-38 and 61-80, wherein the viscosity of the aqueous portion at 25° C. ranges from 10 cP to 500 cP or from 10 cP to 100 cP.

[0168] Embodiment 82 provides the method of any one of embodiments 39 to 79, wherein the viscosity of the first mixture at 25° C. is in the range of 5 cP to 1000 cP.

[0169] Embodiment 83 provides the method of any one of embodiments 39-79 and 82, wherein the viscosity of the first mixture at 25° C. ranges from 10 cP to 500 cP, or from 10 cP to 100 cP.

Claims

1. 1. A method for producing a multi-layer engineered wood product, the method comprising: (a) A polyol component comprising: a polyol, including glycerol; Water, A base, Optionally, a tackifier; and Optionally, sodium trimetaphosphate; and Optionally, sodium sulfite, sodium bisulfite, sodium metabisulfite, or mixtures thereof; Optionally, mixed with borax, forming a first mixture; (b) mixing the first mixture produced in (a) with a plurality of wood components to obtain a second mixture, or mixing the first mixture produced in (a) with a polypeptide-containing component that comprises a vegetable protein to obtain a third mixture; (c) mixing the second mixture produced in (b) with a polypeptide-containing component comprising vegetable protein to form a fourth mixture, or mixing the third mixture produced in (b) with a plurality of wood components to form a fifth mixture to form a first multi-layer engineered wood precursor; (d) repeating (a)-(c) at least once to form a second multi-layer engineered wood precursor; (e) stacking the first multi-layer engineered wood precursor and the second multi-layer engineered wood precursor with a third multi-layer engineered wood precursor, the third multi-layer engineered wood precursor being optionally formed according to (a) to (c); (f) curing the first multi-layer engineered wood precursor, the second multi-layer engineered wood precursor, and the third multi-layer engineered wood precursor.

2. 1. A method for producing a multi-layer engineered wood product, the method comprising: (a) A polyol component comprising: a polyol, including glycerol; Water, A base, Optionally, a tackifier; and Optionally, sodium trimetaphosphate; and Optionally, sodium sulfite, sodium bisulfite, sodium metabisulfite, or mixtures thereof; Optionally, mixed with borax, forming a first mixture; (b) mixing the first mixture produced in (a) with a plurality of wood components to obtain a second mixture, or mixing the plurality of wood components with a polypeptide-containing component that includes a vegetable protein to obtain a third mixture; (c) mixing the second mixture produced in (b) with a polypeptide-containing component comprising vegetable protein to form a fourth mixture, or mixing the third mixture produced in (b) with the first mixture produced in (a) to form a fifth mixture to form a first multi-layer engineered wood precursor; (d) repeating (a)-(c) at least once to form a second multi-layer engineered wood precursor; (e) stacking the first multi-layer engineered wood precursor and the second multi-layer engineered wood precursor with a third multi-layer engineered wood precursor, the third multi-layer engineered wood precursor being optionally formed according to (a) to (c); (f) curing the first multi-layer engineered wood precursor, the second multi-layer engineered wood precursor, and the third multi-layer engineered wood precursor.

3. 3. The method of claim 1 or 2, further comprising mixing the plurality of wood components with a swelling retarding component.

4. The method of any one of claims 1 to 3, wherein the polyol component is in the range of 5% to 50% by weight, based on the dry weight of the first mixture.

5. The method of any one of claims 1 to 4, wherein the mixing in (b) comprises spraying the first mixture onto the plurality of wood components.

6. The method of any one of claims 1 to 5, wherein the polypeptide-containing component of (c) is in powder form.

7. 7. The method of any one of claims 1 to 6, further comprising mixing sodium sulfite, sodium bisulfite, sodium metabisulfite, or mixtures thereof with (a), (b), (c), or combinations thereof.

8. 8. The method of any one of claims 1 to 7, wherein the first mixture produced in (a) is aqueous and comprises 1 wt. % to 15 wt. % of the base based on the dry weight of the first mixture, and the pH of the second mixture or the third mixture produced in (b) is greater than 10.

9. 9. The method of any one of claims 1 to 8, wherein the polypeptide-containing component comprises soy flour, soy meal, soy protein, pea protein, wheat gluten, corn protein isolate, or a mixture thereof, in the range of 20% to 85% by weight based on the dry weight of the first mixture.

10. 10. The method of any one of claims 1 to 9, wherein the polypeptide-containing ingredient comprises soy flour, the soy flour being 40% to 65% protein by weight based on total soy flour added.

11. 11. The method of any one of claims 1 to 10, wherein the polypeptide-containing component comprises soy flour and is in the range of 20% to 85% by weight based on the dry weight of the first mixture.

12. 12. The method of any one of claims 1 to 11, wherein the mixture produced by (a), (b), (c), or combinations thereof, is substantially free (e.g., less than 1 wt. %) of urea-formaldehyde, methylene diphenyl diisocyanate, or polyamide-epichlorohydrin binders, or mixtures thereof.

13. 13. The method of any one of claims 1 to 12, wherein the mixture produced by (a), (b), (c), or combinations thereof, further comprises sodium sulfite, sodium bisulfite, sodium metabisulfite, or mixtures thereof.

14. 14. The method of any one of claims 1 to 13, wherein the mixture produced by (a), (b), (c), or combinations thereof, further comprises borax, such as sodium tetraborate decahydrate (or sodium tetraborate octahydrate), sodium tetraborate pentahydrate, and / or anhydrous sodium tetraborate.

15. 15. The method of claim 14, wherein the borax ranges from 1% to 15% by weight based on the dry weight of the first mixture.

16. 16. The method of claim 14 or 15, wherein the borax is in the range of 3% to 6% by weight, based on the dry weight of the first mixture.

17. 17. The method of any one of claims 1 to 16, wherein the curing in (f) is carried out at a temperature of from 100°C to 250°C (e.g. at least 198°C, at least 204°C, at least 246°C, in the range of 198°C to 232°C, 204°C to 226°C, 210°C to 221°C, less than 315°C, or preferably less than 230°C, or for example in the range of 204°C to 248°C, 210°C to 243°C, 210°C to 226°C, at least 215°C, or at least 251°C).

18. The method of any one of claims 1 to 17, wherein the base comprises NaOH, KOH, magnesium oxide, or a mixture thereof.

19. The method of any one of claims 1 to 18, wherein the base comprises NaOH.

20. The method of any one of claims 1 to 19, wherein the multi-layer engineered wood product comprises particle board.

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