The present invention relates to a process for preparing a bonding resin, wherein lignin is provided in the form of a solution in ammonia and/or an organic base and mixed with one or more crosslinkers and optionally one or more additives. The bonding resin is useful for example in the manufacture of laminates, mineral wool insulation and wood products such as plywood, oriented strandboard (OSB), laminated veneer lumber (LVL), medium density fiberboards (MDF), high density fiberboards (HDF), parquet flooring, curved plywood, veneered particleboards, veneered MDF or particle boards. The bonding resin is also useful for example in composites, molding compounds and foundry applications.

According to an example aspect of the present invention, there is provided a composition comprising colloidal lignin particles and an epoxy compound.

The disclosure relates to adhesive compositions, including non-crosslinked resins and crosslinked/cured adhesives joining substrates, as well as related methods for making the compositions and articles. Compared to a conventional phenol (P) and formaldehyde (F) resin, the disclosed methods and compositions use lignin (L) and higher aldehydes (A) as corresponding replacements to provide an analog to a conventional PF resin with biobased reactants. Due to the differing reactivity of the LA components compared to the PF components, the initial condensation reaction between ortho-reactive sites in the lignin and the aldehyde is controlled to prevent gelation of the aqueous reaction mixture while reacting substantially all of the LA reactants to provide a non-crosslinked resin reaction product. The resin reaction product can then be cured at high temperature/high pressure conditions to provide a crosslinked adhesive, for example joining two substrates.

The invention relates to a composition, such as an adhesive and/or injectable composition, comprising at least or consisting of: ground plant seeds, protein isolate, starch or mixture thereof, a metal oxide, a plasticizer, and optionally, water.

The invention also concerns an article and a lignocellulosic-based composite comprising said composition.

An environmentally-friendly epoxy tannin resin based polyurea adhesive and its preparation method are provided. The method includes preparing the environmentally-friendly water-resistant tannin-based wood adhesive by graft copolymerization of epoxy tannin, which is obtained by epoxidation of tannin using epoxy chloropropane, with triethylene tetramine and subsequent deamination reaction of them with urea.

An environmentally-friendly epoxy tannin resin based polyurea adhesive and its preparation method are provided. The method includes preparing the environmentally-friendly water-resistant tannin-based wood adhesive by graft copolymerization of epoxy tannin, which is obtained by epoxidation of tannin using epoxy chloropropane, with triethylene tetramine and subsequent deamination reaction of them with urea.

The present invention relates to a formaldehyde-free medium-high-density board capable of meeting deep facing requirements, and a method for manufacturing same. The method includes: wood chipping, screening, cooking and softening, fiber separating, gluing, drying and sorting, paving, pre-pressing, hot pressing, cooling, sanding, and inspection and warehousing, where the gluing is two-step gluing, including: first performing gluing once by using a lignin adhesive, and then performing secondary gluing by using an MDI adhesive after waterproof treatment. According to the manufacturing method of the present invention, by using biomass adhesives and formaldehyde-free adhesives without adding additives such as a curing agent and an anti-mildew agent, formaldehyde pollution is eliminated from the source by using a two-step gluing method, so that production is formaldehyde-free, and the product is formaldehyde-free. Through the sequential control of the gluing process and the grasp of the gluing type and ratio, surface hardness of the product is improved, and the final product is capable of deep facing to reach 20 to 80 filaments.

The present invention relates to a method for increasing the reactivity of lignin, wherein the method comprises the following steps: a) forming, under heating at a temperature of 30-70° C., an aqueous dispersion comprising alkali and lignin, wherein the alkali comprises a hydroxide of an alkali metal; and b) heating the dispersion formed in step a) at a temperature of 50-95° C. for producing alkalated lignin.

The invention provides protein adhesives and methods of making and using such adhesives. One type of protein adhesive described herein contains lignin and ground plant meal or an isolated polypeptide composition obtained from plant biomass. Other types of protein adhesives described herein contain a plant protein composition and either a hydroxyaromatic/aldehyde, urea/aldehyde, or amine/aldehyde component.

Adhesive compositions containing (1) one or two adhesive compositions produced from the fruit but not the seeds of Osage orange fruit and (2) a known adhesive. The one or two adhesive compositions produced from the fruit but not the seeds of Osage orange fruit are produced by a process involving drying the cut peel and mesocarp but not the seeds of the fruit of Osage orange to produce dried peel and mesocarp, milling the dried peel and mesocarp to produce milled peel and mesocarp, extracting the milled peel and mesocarp with an organic solvent (e.g., hexane) or a polar aprotic solvent (e.g., ethyl acetate) to produce the first adhesive composition, and optionally wherein the amorphous layer between the polar aprotic solvent and the milled peel and mesocarp is the second adhesive composition.