In line with the GREENJOIST project targets and the LIFE+ programme guidelines, a set of activities has been planned to successfully pursue objectives and results.
Additionally partners have already performed some preliminary actions
The project will push research forward on three materials which have already shown good results in lab tests and research
Wood adhesives prepared with formaldehyde, showing sufficient reactivity to produce panels with properties comparable to conventional ones, and high phenol replacement levels (~50%) reported by applying several modification steps when used for the production of wood panels such as plywood and OSB.
Research has reported 30-50% tannin replacement of the resin solids in amino resins; however tannin use has been limited due to its high reactivity leading to quick viscosity development and thus short pot life to the resin. New solutions proposed for these issues refer to pH adjustments and use of other hardeners.
Is the major storage carbohydrate (polysaccharide) in higher plants and is available in abundance. Commercialised during the last few years, starch polymers today dominate the bio-based thermoplastic polymer market, positive research results have shown its applicability in resins for woodworking products.
GREENJOIST will test any type of lignin, tannin and starch natural raw materials for the substitution of chemical components of PF and MUF resins in order to produce composites from recycled wood. Although lignin and tannin may have been used before in binders for the production of wood-based panels, there are no references for their use in recycled wood that has many peculiarities with respect to raw wood. Moreover the use of starch in such thermosetting binding systems will be studied for the first time as starch has been mostly used in thermoplastic polymers so far.