Preparation and performance study of GLC/TMP double crosslinking modified waterborne polyurethane for wood coatings

IF 2.3 4区 材料科学 Q2 CHEMISTRY, APPLIED Journal of Coatings Technology and Research Pub Date : 2024-09-10 DOI:10.1007/s11998-024-00984-7
Tianhao Lu, Yuanyuan Zhou, Yan Liu, Binjie Xin, Ying Qin, Guankun Kuang
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Abstract

A glucose-modified double crosslinked waterborne polyurethane (WPCU) was synthesized by glucose (GLC) and trimethylolpropane (TMP) as crosslinking agents, polycarbonate diol (PCDL) as the functional soft segment material, and isophorone diisocyanate (IPDI) as the hard segment. The effects of GLC and TMP on the structure and material characteristics of WPCU were examined and evaluated using Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and other tests. The experimental results demonstrate the favorable comprehensive performance of the modified WPCU. The double-crosslinked polyurethanes exhibited excellent mechanical strength (30.9 MPa for WPCU-0.9 film), a higher water contact angle (82.9° for WPCU-0.3 film), and superior thermal stability compared to single-crosslinked polyurethanes modified solely with GLC. In addition, a new type of double crosslinked waterborne wood paint was formulated by adding various additives. It was subjected to painting experiments on wood panels. The newly developed wood coatings using double crosslinked WPCU emulsions exhibit good chemical resistance (to alcohols, acids, and bases), dry heat resistance, and adhesion (adhesion class I). Paint films achieve a hardness of 2H when the GLC content exceeds or equals 1.2%, exhibiting excellent adhesion resistance, which could contribute to the development of high-stiffness waterborne polyurethanes in the future.

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木器涂料用 GLC/TMP 双交联改性水性聚氨酯的制备和性能研究
以葡萄糖(GLC)和三羟甲基丙烷(TMP)为交联剂,聚碳酸酯二元醇(PCDL)为功能性软段材料,异佛尔酮二异氰酸酯(IPDI)为硬段材料,合成了葡萄糖改性双交联水性聚氨酯(WPCU)。利用傅立叶变换红外光谱(FTIR)、透射电子显微镜(TEM)、热重分析(TGA)、扫描电子显微镜(SEM)和其他测试方法考察和评估了 GLC 和 TMP 对 WPCU 结构和材料特性的影响。实验结果表明,改性 WPCU 具有良好的综合性能。与仅用 GLC 改性的单交联聚氨酯相比,双交联聚氨酯表现出优异的机械强度(WPCU-0.9 薄膜为 30.9 兆帕)、更高的水接触角(WPCU-0.3 薄膜为 82.9°)和更优越的热稳定性。此外,还通过添加各种添加剂配制了一种新型双交联水性木器漆。对其进行了木板涂装实验。新开发的使用双交联 WPCU 乳液的木器涂料具有良好的耐化学性(对醇、酸和碱)、耐干热性和附着力(附着力 I 级)。当 GLC 含量超过或等于 1.2% 时,漆膜的硬度达到 2H,表现出优异的耐附着性,这有助于未来高硬度水性聚氨酯的开发。
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来源期刊
Journal of Coatings Technology and Research
Journal of Coatings Technology and Research 工程技术-材料科学:膜
CiteScore
4.30
自引率
8.70%
发文量
130
审稿时长
2.5 months
期刊介绍: Journal of Coatings Technology and Research (JCTR) is a forum for the exchange of research, experience, knowledge and ideas among those with a professional interest in the science, technology and manufacture of functional, protective and decorative coatings including paints, inks and related coatings and their raw materials, and similar topics.
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