The effect of lignin-based polyols on the properties of polyurethane coatings

IF 1.8 4区材料科学 Q4 GREEN & SUSTAINABLE SCIENCE & TECHNOLOGY Green Materials Pub Date : 2023-05-05 DOI:10.1680/jgrma.23.00040

Fatemeh Farhood Hassani Khorshidi, S. Najafi, F. Najafi, A. Pizzi, D. Sandberg, R. Behrooz

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引用次数: 1

Abstract

The aim of this research was to replace petroleum-based polyols with polyols made from lignin and nano-lignin in the production of polyurethane coatings. Lignin and nano-lignin were first reacted with either diethylenetriamine (DETA) or ethylenediamine (EDA). Subsequently, they were modified with propylene carbonate. The lignin and nano-lignin derived polyols replaced the conventional polyol-acrylic in the production of polyurethane coatings. The results of FTIR analysis showed that urethane, isothiocyanate, and strong C-N bonds were formed in nano-lignin-based polyurethanes. Moreover, the surface-adhesion test of the lignin-based polyurethane coating showed that by increasing the lignin content, the adhesion strength of the coating decreased. Mixing lignin nanoparticles in the polyurethane substrate caused the adhesion strength to rise from 1.67 MPa to 4.52 MPa. An increase of amino nano-lignin content up to 7% of oil based polyol improved the curing of the coating and increased the scratch resistance to more than 5 Kg. The results showed that lignin from a mechanical pulping process has a direct effect on reducing the smoothness and the glossiness in polyurethane coatings.

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木质素基多元醇对聚氨酯涂料性能的影响

本研究的目的是用木质素和纳米木质素制备的多元醇代替石油基多元醇生产聚氨酯涂料。木质素和纳米木质素首先与二乙烯三胺(DETA)或乙二胺(EDA)反应。随后，用碳酸丙烯酯对其进行改性。木质素和纳米木质素衍生多元醇在聚氨酯涂料生产中取代了传统的丙烯酸多元醇。FTIR分析结果表明，纳米木质素基聚氨酯中形成了聚氨酯、异硫氰酸酯和强C-N键。此外，木质素基聚氨酯涂料的表面附着力测试表明，随着木质素含量的增加，涂料的附着力降低。在聚氨酯基材中掺入木质素纳米颗粒后，其粘接强度由1.67 MPa提高到4.52 MPa。将氨基纳米木质素含量增加到7%的油基多元醇，改善了涂层的固化，并将耐划伤性提高到5kg以上。结果表明，机械制浆过程中产生的木质素对聚氨酯涂料的光滑度和光泽度有直接影响。

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来源期刊

Green Materials Environmental Science-Pollution

CiteScore

3.50

自引率

15.80%

发文量

期刊介绍： The focus of Green Materials relates to polymers and materials, with an emphasis on reducing the use of hazardous substances in the design, manufacture and application of products.