欢迎访问《林产化学与工业》,

林产化学与工业 ›› 2011, Vol. 31 ›› Issue (4): 7-12.

• 研究报告 • 上一篇    下一篇

乙酸木质素分级产物制备环氧树脂的研究

冯攀, 谌凡更   

  1. 华南理工大学 制浆造纸工程国家重点实验室, 广东 广州 510640
  • 收稿日期:2011-01-05 修回日期:1900-01-01 出版日期:2011-08-30 发布日期:2011-08-30
  • 通讯作者: 谌凡更,研究员,博士生导师,主要从事植物资源化学研究;E-mail:fgchen@scut.edu.cn。

Preparation of Epoxy Resins from Fractionated Acetic Acid Lignin

FENG Pan, CHEN Fan-geng   

  1. State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
  • Received:2011-01-05 Revised:1900-01-01 Online:2011-08-30 Published:2011-08-30

摘要: 采用沉淀法将乙酸木质素在乙酸水溶液中分成具有不同相对分子质量的3个级分。3个级分经苯酚酚化后,得到3种酚化木质素,其酚羟基含量明显提高。3种酚化产物与环氧氯丙烷反应得到3种木质素基环氧树脂。由最低相对分子质量的酚化木质素制备的环氧树脂环氧值最高为 1.69 mmol/g,初始热分解温度最高达到 256.3 ℃,残炭率最低 41.6 %。木质素基环氧树脂与E-44环氧树脂共混固化后,可以较大程度地提高E-44环氧树脂的黏接剪切强度。由相对分子质量最低的酚化木质素制备的环氧树脂,与E-44环氧树脂共混固化后黏接剪切强度最高达到 7.9 MPa。

关键词: 乙酸木质素, 分级, 酚化, 环氧化

Abstract: Acetic acid lignin (AAL) was fractionated into three fractions with different relative molecular mass at different concentration of acetic acid-water solution. These three fractions further reacted with phenol and yielded the corresponding phenolized lignins (PL). PL showed higher phenolic hydroxyl than that of AAL. Three kinds of lignin-based epoxy resins (PLEP) were prepared from PL by reacting with epichlorohydrin. PLEP showed the highest epoxy value(1.69 mmol/g), thermal degradation temperature (256.3 ℃),and the lowest char yield (41.6 %) using PL with the lowest relative molecular weight. It was found that the adhesive shear strength of the cured blends of PLEP and E-44 epoxy resin was improved compared with E-44 epoxy resin. For example, the cured blend of E-44 epoxy resin and PLEP prepared from PL with the lowest relative molecular mass showed high adhesive shear strength(7.9 MPa).

Key words: acetic acid lignin, fractionation, phenolation, epoxidation

中图分类号: