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Preparation and Application of Lignin‐Based Epoxy Resin from Pulping Black Liquor
Author(s) -
Zhu Yanchao,
Li Zheng,
Wang Xiaofeng,
Ding Na,
Tian Yumei
Publication year - 2020
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201904451
Subject(s) - lignin , black liquor , epoxy , pulp (tooth) , curing (chemistry) , chemistry , pulp and paper industry , materials science , organic chemistry , chemical engineering , polymer chemistry , medicine , pathology , engineering
Abstract In the present work, lignin was isolated from pulping black liquor. Selective precipitation was achieved by adding hydrochloricacid to adjust pulping black liquor pH from 1 to 5. Reaction pH, reaction temperature and the content of lignin were investigated in the total process. A considerable increase in the amount of precipitate was observed while pH was decreasing. Lignin obtained from pulping black liquor had been used as the reactant to partly replace bisphenol A in preparing epoxy resins with different lignin additives at 90 °C. The mechanical and the thermal properties of cured lignin‐based epoxy resins were compared with those at different contents of lignin and reaction temperatures with ethylenediamine as the curing agent. The cured lignin‐based epoxy resins with 20 wt. % lignin at 90 °C showed the highest viscosity up to 396 MPa⋅s. We had successfully got good performance lignin‐based epoxy resin.