木质素/氧化锌复合颗粒的制备及在水性聚氨酯中的应用

doi:10.7503/cjcu20180128

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

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. 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 Xueqing^1,², YANG Dongjie^1,^2,^*()

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/Abstract

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

中图分类号:

O636.2

TrendMD:

符方宝, 王欢, 钟锐生, 邱学青, 杨东杰. 木质素/氧化锌复合颗粒的制备及在水性聚氨酯中的应用. 高等学校化学学报, 2018, 39(10): 2335.

FU Fangbao,WANG Huan,ZHONG Ruisheng,QIU Xueqing,YANG Dongjie. Preparation of Lignin/ZnO Composite Nanoparticles and Its Application in Waterborne Polyurethane^†. Chem. J. Chinese Universities, 2018, 39(10): 2335.

图/表 11

Scheme 1 Synthetic procedure of LQAs/ZnO composites

Fig.1 FTIR spectra of AL(a) and LQAs(b)

Fig.2 XRD patterns of LQAs/ZnO composite and ZnO

Fig.3 SEM images of ZnO-0.8(A), ZnO-1.2(B), ZnO-1.6(C) and ZnO-2.0(D)Inset is the image at higher magnification.

Fig.4 SEM images of LQAs/ZnO-0.8(A), LQAs/ZnO-1.2(B), LQAs/ZnO-1.6(C) and LQAs/ZnO-2.0(D) Insets are the higher magnification images of (A)—(D), respectively.

Fig.5 TEM images of LQAs/ZnO-0.8(A), LQAs/ZnO-1.2(B), LQAs/ZnO-1.6(C) and LQAs/ZnO-2.0(D)

Fig.6 TG curves of LQAs/ZnO compositesa. ZnO-2.0; b. LQAs/ZnO-0.8; c. LQAs/ZnO-1.2;d. LQAs/ZnO-1.6; e. LQAs/ZnO-2.0.

Fig.7 UV-Vis DSR spectra of LQAs/ZnO, ZnO and LQAsa. ZnO-2.0; b. LQAs; c. LQAs/ZnO-0.8;d. LQAs/ZnO-1.2; e. LQAs/ZnO-1.6; f. LQAs/ZnO-2.0.

Fig.8 UV light transmittance curves of samplesa. WPU, UPF=5.21; b. WPU-LQAs/ZnO-2.0, UPF=38.55; c. WPU-LQAs/ZnO-1.6, UPF=38.19; d. WPU-LQAs/ZnO-1.2, UPF=32.46; e. WPU-LQAs/ZnO-0.8, UPF=31.93; f. WPU- ZnO-2.0, UPF=18.18.

Fig.9 Mechanical properties of samples during UV aging process(A) Elongation at break vs. UV radiation time; (B) tensile strength at break vs. UV radiation time.

Fig.10 SEM images of WPU(A), WPU- ZnO-2.0(B), LQAs/ZnO-2.0(C) and WPU- LQAs/ZnO-2.0(D)

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木质素/氧化锌复合颗粒的制备及在水性聚氨酯中的应用

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

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木质素/氧化锌复合颗粒的制备及在水性聚氨酯中的应用

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

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