复合凝聚法制备异氰酸酯微胶囊及其在胶合板中的应用

IF 2.9 4区 材料科学 Q2 ENGINEERING, CHEMICAL
Yangbao Ma, Tao Wang, Xiaohui Chang, Ao Liu, Xiaona Meng, Changhui Liu, Yanhua Zhang
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引用次数: 0

摘要

摘要目前异氰酸酯胶粘剂的使用大多需要溶剂的辅助,会造成不良的环境污染和健康影响。含水异氰酸酯避免了溶剂的缺点,但缩短了异氰酸酯的使用寿命。异氰酸酯微胶囊可以避免这些缺点,还可以固化异氰酸酯,提高异氰酸酯的使用效率。本研究采用微胶囊化技术保护高活性的-NCO基团,提高异氰酸酯的稳定性,延长异氰酸酯在水性木材胶粘剂中的使用寿命。即以阿拉伯胶/明胶为壳,异氰酸酯为芯,在油包水乳液中复合凝聚法制备异氰酸酯微胶囊。另外,通过改变工艺参数对制备工艺进行了优化。然后利用傅里叶变换红外光谱仪、扫描电镜、粒度分析仪等对制备的异氰酸酯微胶囊进行表征和分析。最后,将制备的异氰酸酯微胶囊掺入木材胶粘剂中制备胶合板。结果表明,制备的异氰酸酯微胶囊粒径可控,活性基团和核心含量达到较高水平。异氰酸酯微胶囊将异氰酸酯的使用寿命从30分钟左右延长到5小时,并显著提高了异氰酸酯的稳定性。制备的胶合板粘结强度满足(I类胶合板)要求,仅添加20%的-NCO。本文得到河南省教委(No. 23A430038)和国家林业和草原局植物纤维功能材料重点实验室(No. 2022KFJJ12)的资助。特别感谢河南工程大学博士点培养基金项目(No. 811@166.com)的支持。D2022003)。披露声明作者未报告潜在的利益冲突。作者贡献声明:马阳宝、刘长辉、张艳华构思设计实验;马阳宝,常晓辉,刘傲,孟小娜进行了实验;马阳宝、刘长辉、王涛、张艳华分析了数据;马阳宝贡献的试剂/材料/分析工具;论文作者是马阳宝和刘长辉。所有作者都阅读并批准了稿件。基金资助:国家自然科学基金项目[32071692];国家林业和草原局植物纤维功能材料重点实验室[2022KFJJ12];河南省教育委员会[23A430038]。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Preparation of isocyanate microcapsules by complex coacervation and its application in plywood
ABSTRACTAt present, the use of isocyanate adhesives mostly requires the assistance of solvents, which can cause adverse environmental pollution and health effects. The aqueous isocyanate avoids the shortcomings of the solvent, but shortens the working life of the isocyanate. Isocyanate microcapsules can avoid these shortcomings, and can also solidify isocyanate to improve the efficiency of isocyanate use. In this study, microencapsulation technology was used to protect the highly reactive -NCO group, improve the stability of isocyanate, and prolong the working life of isocyanate in water-based wood adhesives. That is, isocyanate microcapsules with gum Arabic/gelatin as shell and isocyanate as core were prepared in oil-in-water emulsion by complex coacervation. In addition, the preparation process was optimized by changing the parameters. Then, the prepared isocyanate microcapsules were characterized and analyzed by Fourier transform infrared spectrometer, Scanning electron microscope, Particle size analyzer, etc. Finally, plywood was prepared by using the prepared isocyanate microcapsules in the wood adhesive. The results showed that, the particle size of isocyanate microcapsules was controllable, and the content of active groups and core in the prepared isocyanate microcapsules can reach a high level. The isocyanate microcapsules extend the working life of isocyanates from about 30 mins to 5 hours, and significantly improve the stability of isocyanates. The bonding strength of the prepared plywood meets the requirements of (Class I plywood) with only 20% -NCO addition.KEYWORDS: Isocyanate microcapsulescomplex coacervationplywoodworking life AcknowledgmentThis work was supported by the Educational Commission of Henan Province of China (No. 23A430038) and the National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials (2022KFJJ12). Special thanks to the support of Doctoral Cultivation Fund Project of Henan University of Engineering (No. D2022003).Disclosure statementNo potential conflict of interest was reported by the author(s).Authorship contribution statementYangbao Ma, Changhui Liu and Yanhua Zhang conceived and designed the experiments; Yangbao Ma, Xiaohui Chang, Ao Liu, Xiaona Meng performed the experiments; Yangbao Ma, Changhui Liu, Tao Wang and Yanhua Zhang analyzed the data; Yangbao Ma contributed reagents/materials/analysis tools; Yangbao Ma and Changhui Liu wrote the paper. All authors read and approved the manuscripts.Additional informationFundingThe work was supported by the National Natural Science Foundation of China [32071692]; National Forestry and Grassland Administration Key Laboratory of Plant Fiber Functional Materials [2022KFJJ12]; Educational Commission of Henan Province of China [23A430038].
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来源期刊
Journal of Adhesion
Journal of Adhesion 工程技术-材料科学:综合
CiteScore
5.30
自引率
9.10%
发文量
55
审稿时长
1 months
期刊介绍: The Journal of Adhesion is dedicated to perpetuating understanding of the phenomenon of adhesion and its practical applications. The art of adhesion is maturing into a science that requires a broad, coordinated interdisciplinary effort to help illuminate its complex nature and numerous manifestations.
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