Wood treated by impregnation with mixed anhydrides
View Patent ↗Process for the chemical treatment of lignocellulose materials, in particular of at least one piece of wood, characterized in that said materials are subjected to impregnation by a chemical agent comprising hydrocarbonaceous chains, this agent being chosen from mixed anhydrides, except for the mixed anhydride of acetic/benzoic acid, said agent being suitable for providing covalent grafting of a plurality of hydrocarbonaceous chains to said materials.
1. A piece of wood, obtained by a process comprising impregnating the piece of wood with a chemical agent comprising hydrocarbonaceous chains:
wherein:
the agent comprises a mixed anhydride, given by the formula:
where R is a first hydrocarbonaceous chain and R 1 is a second hydrocarbonaceous chain different from the first hydrocarbonaceous chain, except that when either of R or R 1 is a methyl group, the other of R and R 1 is not a phenyl group;
as a result of impregnating with the agent, a plurality of the hydrocarbonaceous chains are covalently grafted to lignocellulose of the piece of wood; and
lignocellulose fibers of the piece of wood are homogeneous and exhibit a smooth appearance.
2. The piece of wood of claim 1 , wherein the covalent grafting is carried out by esterification of the lignocellulose material with the agent.
3. The piece of wood of claim 1 , wherein the impregnating is carried out at a temperature between ambient temperature and 150° C.
4. The piece of wood of claim 1 , wherein the impregnating is carried out in the presence of a catalyst.
5. The piece of wood of claim 1 , wherein:
R is a C1 to C3 hydrocarbonaceous chain;
R1 is a C5 to C23 hydrocarbonaceous chain; and
the carboxylic acid and fatty acid are saturated or unsaturated.
6. The piece of wood of claim 1 , wherein R is a methyl group, and R1 is a heptyl group.
7. A piece of wood, obtained by a process comprising impregnating the piece of wood with a chemical agent comprising hydrocarbonaceous chains:
wherein:
the agent comprises a mixed anhydride, given by the formula:
where R is a first hydrocarbonaceous chain and R1 is a second hydrocarbonaceous chain different from the first hydrocarbonaceous chain, except that when either of R or R1 is a methyl group, the other of R and R1 is not a phenyl group;
as a result of impregnating with the agent, a plurality of the hydrocarbonaceous chains are covalently grafted to lignocellulose of the piece of wood; and
the piece of wood exhibits a degree of absorption of about 3.5%.
8. The piece of wood of claim 7 , wherein the covalent grafting is carried out by esterification of the lignocellulose material with the agent.
9. The piece of wood of claim 7 , wherein the impregnating is carried out at a temperature between ambient temperature and 150° C.
10. The piece of wood of claim 7 , wherein the impregnating is carried out in the presence of a catalyst.
11. The piece of wood of claim 7 , wherein:
R is a C1 to C3 hydrocarbonaceous chain;
R1 is a C5 to C23 hydrocarbonaceous chain; and
the carboxylic acid and fatty acid are saturated or unsaturated.
12. The piece of wood of claim 7 , wherein R is a methyl group, and R1 is a heptyl group.
13. A piece of wood, obtained by a process comprising impregnating the piece of wood with a chemical agent comprising hydrocarbonaceous chains:
wherein:
the agent comprises a mixed anhydride, given by the formula:
where R is a first hydrocarbonaceous chain and R1 is a second hydrocarbonaceous chain different from the first hydrocarbonaceous chain, except that when either of R or R1 is a methyl group, the other of R and R1 is not a phenyl group;
as a result of impregnating with the agent, a plurality of the hydrocarbonaceous chains are covalently grafted to lignocellulose of the piece of wood; and
the piece of wood exhibits a degree of swelling of about 3.5%.
14. The piece of wood of claim 13 , wherein the covalent grafting is carried out by esterification of the lignocellulose material with the agent.
15. The piece of wood of claim 13 , wherein the impregnating is carried out at a temperature between ambient temperature and 150° C.
16. The piece of wood of claim 13 , wherein the impregnating is carried out in the presence of a catalyst.
17. The piece of wood of claim 13 , wherein:
R is a C1 to C3 hydrocarbonaceous chain;
R1 is a C5 to C23 hydrocarbonaceous chain; and
the carboxylic acid and fatty acid are saturated or unsaturated.
18. The piece of wood of claim 13 , wherein R is a methyl group, and R1 is a heptyl group.