高等学校化学学报 ›› 2019, Vol. 40 ›› Issue (5): 1058.doi: 10.7503/cjcu20180778

• 高分子化学 • 上一篇    下一篇

木质素对木质素-脲醛共聚树脂的影响及反应机理

段亚军, 程岩岩, 隋光辉, 朱燕超, 王晓峰, 郭玉鹏(), 王子忱   

  1. 吉林大学化学学院, 长春 130012
  • 收稿日期:2018-11-17 出版日期:2019-03-09 发布日期:2019-03-09
  • 作者简介:

    联系人简介: 郭玉鹏, 男, 博士, 教授, 主要从事功能材料与生物质基材料的制备研究. E-mail: guoyupeng@jlu.edu.cn

  • 基金资助:
    长春市科技计划项目(批准号: 15SS06)和吉林省科技发展计划项目(批准号: 20150204063GX)资助.

Lignin Impacts on the Lignin-urea-formaldehyde Copolymer Resin and the Reaction Mechanism

DUAN Yajun, CHENG Yanyan, SUI Guanghui, ZHU Yanchao, WANG Xiaofeng, GUO Yupeng*(), WANG Zichen   

  1. College of Chemistry, Jilin University, Changchun 130012, China
  • Received:2018-11-17 Online:2019-03-09 Published:2019-03-09
  • Contact: GUO Yupeng E-mail:guoyupeng@jlu.edu.cn
  • Supported by:
    † Supported by the Science and Technology Program of Changchun City, China(No.15SS06) and the Development Project of Science and Technology of Jilin Province, China(No.20150204063GX)

摘要:

通过调控甲醛与尿素摩尔比, 降低脲醛树脂胶黏剂中游离甲醛的含量, 以生物质玉米芯为原材料, 用碱液提取得到的碱木质素溶液与甲醛和尿素进行三元逐步共聚, 弥补降低醛脲比带来的胶合强度的快速下降问题. 以降低游离甲醛含量同时兼顾胶合强度为原则进行探索, 得到最佳实验条件为甲醛与尿素摩尔比(F/U)为0.91∶1, 木质素添加量为20%(质量分数), 在此条件下木质素-尿素-甲醛共聚树脂(LUF)胶合强度为0.99 MPa, 游离甲醛含量为0.26%. 对共聚树脂进行了结构表征, 表明木质素参与到反应中, 并能提高树脂的热稳定性和耐水性, 同时对反应的机理进行了讨论.

关键词: 木质素, 游离甲醛, 脲醛树脂, 三元共聚

Abstract:

By regulating the molar ratio of formaldehyde and urea to reduce the content of free formaldehyde in urea-formaldehyde resin adhesive, using biomass corn cob as raw material to extract lignin with alkali solution, the alkali lignin solution was gradually copolymerized with formaldehyde and urea to compensate for the problem of rapid decrease in the bonding strength caused by the reduction of aldehyde urea ratio. With reducing the free formaldehyde content and taking into account the bonding strength as a principle to explore, the best experimental conditions were obtained: formaldehyde to urea molar ratio of F/U is 0.91∶1, the amount of lignin added is 20%(mass fraction), under these conditions, the lignin-urea-formaldehyde(LUF) copolymer resin has a bonding strength of 0.99 MPa and a free formaldehyde content of 0.26%. The characterization results of the copolymer resin using HR-MS, XPS, FTIR and TG show that lignin can participate in the reaction and improve the thermal stability and water resistance of the resin. At the same time, the mechanism of the reaction was discussed.

Key words: Lignin, Free formaldehyde, Urea-formaldehyde copolymer resin, Ternary copolymer

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