Preparation of Oxidized Organosolv Lignin⁃based Hydrophilic Sizing Agent and Its Application in Polypropylene

doi:10.19894/j.issn.1000-0518.220051

Chinese Journal of Applied Chemistry ›› 2022, Vol. 39 ›› Issue (12): 1854-1861.DOI: 10.19894/j.issn.1000-0518.220051

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Preparation of Oxidized Organosolv Lignin⁃based Hydrophilic Sizing Agent and Its Application in Polypropylene

Chen-Chen ZHANG¹, Yu-Han LIU², Wen-Jie ZHAO¹, Bai-Jun LIU³, Zhao-Yan SUN⁴, Wan-Li LIU, Yan-Miao WANG, Wei HU¹^,²()

^1.School of Chemical Engineering，Changchun University of Technology，Changchun 130012，China
^2.College of Chemistry，Northeast Normal University，Changchun 130022，China
^3.Chemical College of Jilin University，Changchun 130012，China
^4.Changchun Institute of Applied Chemistry Chinese Academy of Sciences，State Key Laboratory of Polymer Physics and Chemistry，Changchun 130022，China
^5.Zhongke Kinhua Changchun High-Tech Company，Changchun 130022，China

Received:2022-02-27 Accepted:2022-07-10 Published:2022-12-01 Online:2022-12-13
Contact: Wei HU
About author:huw884@nenu.edu.cn
Supported by:
the National Science and Technology Major Project(2021YFC2103600);the National Natural Science Foundation of China(52073044);the NSFC Regional Innovation and Development Funding(U21A20330);the Science and Technology Development Plan of Jilin Province, China(20220201124GX);Jilin Provincial Development and Reform Commission, China(2021C036-2);the Key R & D plan of Changchun Science and Technology Bureau(21ZY32);Changchun New Area "Changbai Huigu" Talent Project, China(9-2020004);the Open Research Fund of State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences(2021-25)

Abstract

Abstract:

The interfacial compatibility of carbon fiber （CF） reinforced composites is the key factor to determine the comprehensive properties of the composites. The sizing agent plays an indispensable role between carbon fibers and matrix resins. Environmentally friendly hydrophilic sizing agent is is a hot research issue to be solved. In this work， the hydrophilic lignin-based sizing agent and carbon fiber reinforced polypropylene （PP） composites are prepared and studied. The lignin is ozonized to increase the reactive group. The obtained lignin reacts with epoxy group to prepare the oxidized organic solvent lignin based epoxy resin （OLBE）. OLBE reacts with alcohol amine and carboxylic acid to obtain the hydrophilic lignin-based sizing agent. KH550 is further added to balance the hygroscopicity of sizing agent. Finally， an oxidized organic solvent lignin-based hydrophilic sizing agent （OLBEDK） with excellent stability was prepared. The CF treated with 2.5% solid content OLBEDK was only 3.0 mg. The ILSS， Flexural strength， Flexural modulus and Impact strength of CF/PP composites are increased by 50.8%，34.2%， 53.7% and 127.8%， respectively， compared with those of CF/PP composites without sizing. This is attributed to the π-π conjugation between the benzene ring of lignin and the carbon six-membered ring of CF， and the physical entanglement between the alkyl chain of KH550 and the molecular chain of PP， which enhances the interfacial interaction between CF and PP effectively.

Key words: Oxidation, Lignin, Polypropylene, Sizing agent, Carbon fiber composite

CLC Number:

O636.2

Chen-Chen ZHANG, Yu-Han LIU, Wen-Jie ZHAO, Bai-Jun LIU, Zhao-Yan SUN, Wan-Li LIU, Yan-Miao WANG, Wei HU. Preparation of Oxidized Organosolv Lignin⁃based Hydrophilic Sizing Agent and Its Application in Polypropylene[J]. Chinese Journal of Applied Chemistry, 2022, 39(12): 1854-1861.

Figures/Tables 6

References 17

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质量分数 Mass fraction/%	粒径 Grain size/nm	沉淀率 Precipitation rate/%	上浆率 Percentage size pickup/%	毛丝量 Amount of hair silk/mg
0	?	?	0	11.7±0.2
1.5	216.82	0.84	1.00	3.4±0.1
2.0	217.80	1.20	1.44	3.2±0.1
2.5	215.62	1.24	1.78	3.0±0.1

质量分数 Mass fraction/%	粒径 Grain size/nm	沉淀率 Precipitation rate/%	上浆率 Percentage size pickup/%	毛丝量 Amount of hair silk/mg
0	?	?	0	11.7±0.2
1.5	216.82	0.84	1.00	3.4±0.1
2.0	217.80	1.20	1.44	3.2±0.1
2.5	215.62	1.24	1.78	3.0±0.1

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Preparation of Oxidized Organosolv Lignin⁃based Hydrophilic Sizing Agent and Its Application in Polypropylene

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