高等学校化学学报 ›› 2018, Vol. 39 ›› Issue (10): 2335.doi: 10.7503/cjcu20180128

• 高分子化学 • 上一篇    下一篇

木质素/氧化锌复合颗粒的制备及在水性聚氨酯中的应用

符方宝1, 王欢1, 钟锐生1, 邱学青1,2, 杨东杰1,2()   

  1. 1. 华南理工大学化学与化工学院, 2. 制浆造纸工程国家重点实验室, 广州 510640
  • 收稿日期:2018-02-01 出版日期:2018-09-29 发布日期:2018-09-29
  • 作者简介:

    联系人简介: 杨东杰, 女, 博士, 教授, 博士生导师, 主要从事木质素资源化利用的应用基础研究. E-mail: cedjyang@scut.edu.cn

  • 基金资助:
    国家自然科学基金(批准号: 21436004, 21576106)和广东省科技计划项目(批准号: 2017B090903003)资助.

Preparation of Lignin/ZnO Composite Nanoparticles and Its Application in Waterborne Polyurethane

FU Fangbao1, WANG Huan1, ZHONG Ruisheng1, QIU Xueqing1,2, YANG Dongjie1,2,*()   

  1. 1. School of Chemistry and Chemical Engineering, 2. State Key Lab of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
  • Received:2018-02-01 Online:2018-09-29 Published:2018-09-29
  • Contact: YANG Dongjie E-mail:cedjyang@scut.edu.cn
  • Supported by:
    † Supported by the National Natural Science Foundation of China(Nos.21436004, 21576106) and the Science and Technology Plan Project of Guangdong Province, China(No.2017B090903003).

摘要:

通过沉淀法以季铵化木质素(LQAs)、 醋酸锌和NaOH为原料制备了不同木质素负载量的木质素/氧化锌(LQAs/ZnO)复合颗粒. 测试结果表明, LQAs/ZnO复合颗粒是由LQAs和ZnO形成的杂化结构, 且NaOH用量对LQAs/ZnO复合颗粒的形貌有显著影响. 与纯ZnO相比, 复合颗粒对紫外光的吸收明显增强. 此外, 探究了复合颗粒掺杂改性的水性聚氨酯(WPU)复合薄膜的光学和力学性能. 与0.6%(质量分数)的LQAs/ZnO复合颗粒均匀共混成膜的WPU复合薄膜的断裂拉伸强度和断裂伸长率相较于纯WPU 薄膜, 分别提高了81.5%和10.9%. 经过192 h紫外光老化测试后, 断裂拉伸强度保持在25 MPa以上, 断裂伸长率保持在360 %以上, 表明LQAs/ZnO复合颗粒可有效提高WPU薄膜的紫外屏蔽性能和抗紫外老化性能.

关键词: 木质素, 氧化锌, 复合颗粒, 水性聚氨酯

Abstract:

A series of lignin/zinc oxide(LQAs/ZnO) composites with different lignin content was prepared through a precipitation method using quaternized alkali lignin(LQAs), zinc acetate and sodium hydroxide as raw materials. The results of X-ray diffraction(XRD), scanning electron microscope(SEM), transmission electron microscope(TEM) and ultraviolet-visible spectroscopy(UV-Vis) demonstrated that the as-prepared LQAs/ZnO composites exhibited a hybrid structure and the microstructure was significantly influenced by the dosage of NaOH. The UV-absorption performance of LQAs/ZnO composites enhanced remarkably compared with pure ZnO. In addition, the optical and mechanical properties of waterborne polyurethane(WPU) films doped with LQAs/ZnO composites were investigated. The tensile strength and the elongation at break of WPU films blended with LQAs/ZnO composites were 81.5% and 10.9%, respectively, higher than those of pure WPU films. The tensile strength and the elongation at break of the WPU composite films were maintained above 25 MPa and 360% by a 192 h of UV-aging test. LQAs/ZnO composites could effectively enhance the UV shielding performance and the anti-ultraviolet aging ability of WPU.

Key words: Lignin, Zinc oxide, Composite particle, Waterborne polyurethane

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