Preservative composition for wood based on modified lignin
AssigneeUniversidad Del Pais Vasco/Euskal Herriko Unibertsitatea
InventorsJalel Labidi Bouchrika, Darci Alberto Gatto, Patricia Bihalva Soares Dos Santos
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Abstract
A method for preparing a wood preservative composition, includes modifying lignin with Na2B4O7 or NaNO3 and then with a chromium (II) salt, copper (II), cadmium (II) or zinc (II), for example, metal nitrates (Cr(NO3)2, Cu(NO3)2, Cd(NO3)2, Zn(NO3)2); to the preservative obtainable by this method; and to a method for preserving wood; and to the preserved wood. The preservative prevents degradation by xylophagous and fungal agents, and also improves some properties of the wood, and the hygroscopicity and fire resistance.
Claims8
A method for preparing a preservative composition for wood, the method includes the steps of:
- a) mixing lignin and a solution of Na2B4O7 or NaNO3 while stirring;
- b) adding, while stirring, a metallic salt containing a M2+ ion, wherein M is an element selected from groups 6, 11, and 12 of the periodic table of elements;
- c) filtering the resulting solid, which is a modified lignin;
- and
- d) suspending the modified lignin in water to obtain the preservative composition for wood.
Dependencies are inferred from the claim text.