PHENOLIC RESIN OBTAINED BY POLYCONDENSATION OF FORMALDEHYDE, PHENOL AND LIGNIN

摘要

A lignin-phenol-formaldehyde resin, which is obtained by polycondensation of formaldehyde, phenol and lignin in the presence of a basic or acidic catalyst, is characterized in that the lignin is a lignin that is not chemically modified at the available functional groups. This lignin has a low molecular mass and includes available functional groups chosen from the group including aliphatic hydroxyls and phenolic hydroxyls. The degree of substitution by weight of phenol with the lignin is between 50% and 60%. The weight proportion of the lignin and of phenol in the resin is equal to the weight proportion of phenol in a lignin-free phenol-formaldehyde (PF) resin.

主权项

1. Thermosetting synthetic resin, known as a lignin-phenol-formaldehyde resin, or LPF resin, which is obtained by polycondensation of formaldehyde, phenol and lignin in the presence of a basic or acidic catalyst, wherein the lignin is a lignin that is not chemically modified at the available functional groups, and said available functional groups are chosen from the group comprising aliphatic hydroxyls and phenolic hydroxyls.