高性能涂料中5-和6-环碳酸酯-多异氰酸酯加合物的比较

IF 2.3 4区 材料科学 Q2 Chemistry Journal of Coatings Technology and Research Pub Date : 2022-09-09 DOI:10.1007/s11998-022-00665-3
Julia Seithümmer, Philipp Knospe, René Reichmann, Jochen S. Gutmann, Kerstin Hoffmann-Jacobsen, Michael Dornbusch
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引用次数: 0

摘要

如今,涂料需要满足各种要求,如在低温下具有优异的机械、化学和光学性能。在涂料工业中,聚异氰酸酯、胺或三聚氰胺被大规模地用作交联剂。本文合成了一种基于羟基官能团碳酸酯的新型自交联剂,该自交联剂具有较高的环张力,因此可能具有较低的烘烤温度,并将其作为自交联剂的性能与市售的5元碳酸甘油制成的交联剂进行了比较。在温和的反应条件下,以市售物质为原料,酶促合成了羟基功能的6元碳酸盐单体,并与六亚甲基二异氰酸酯三聚体连接,随后进行了自聚合。核磁共振和红外光谱以及气相色谱-质谱分析是表征单体和交联剂的合适技术。通过DSC测量,评价了6元环碳酸酯与无开环多异氰酸酯的附着反应的适宜参数。自交联的进展伴随着红外光谱的特征变化以及振荡流变交联过程中存储模量和损耗模量随时间和温度的变化。此外,确定了所得涂层的玻璃化转变温度,并进行了溶胶-凝胶分析来估计交联程度。在钢板、铝板和玻璃板上应用后,进行了应用试验。该涂层除具有优异的机械性能和化学性能外,还具有良好的表面附着力和无色性。结合这些特性和相对较低的烘烤温度,6元环碳酸盐交联剂可能代表涂料行业的一项新技术。
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Comparison of 5- and 6-membered cyclic carbonate-polyisocyanate adducts for high performance coatings

Nowadays, coatings need to fulfill a variety of requirements such as having excellent mechanical, chemical, and optical properties at low baking temperatures. On a large scale, polyisocyanates, amines or melamines are used as crosslinking agents in the coatings industry. In this work, a new self-crosslinking agent based on a hydroxy functional 6-membered carbonate with high ring tension and thus presumably lower baking temperature was synthesized and the behavior as self-crosslinking agent was compared to the crosslinking agent derived from the commercially available 5-membered glycerol carbonate. The hydroxy functional 6-membered carbonate monomer was synthesized enzymatically under mild reaction conditions from commercially available substances, linked to a hexamethylene diisocyanate trimer and self-polymerized afterward. NMR- and IR-spectroscopy and GC-MS analysis were found to be suitable techniques to characterize monomers and crosslinking agents. DSC measurements were performed to evaluate appropriate reaction parameters for the attachment reaction of the 6-membered cyclic carbonate to the polyisocyanate without ring opening. The progress of self-crosslinking has been followed by characteristic changes in IR spectra as well as time and temperature-dependent changes of storage and loss modulus while oscillating rheological crosslinking. Furthermore, glass transition temperatures of the resulting coating films are determined, and sol gel analysis was performed to estimate the degree of crosslinking. After application on steel, aluminum and glass plates application tests were performed. In addition to excellent mechanical and chemical properties, the coating film showed good adhesion to the surface and was colorless. Combining these properties with relatively low baking temperatures, 6-membered cyclic carbonate crosslinking agents could represent a new technology for the coatings industry.

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来源期刊
Journal of Coatings Technology and Research
Journal of Coatings Technology and Research CHEMISTRY, APPLIED-MATERIALS SCIENCE, COATINGS & FILMS
CiteScore
4.40
自引率
8.70%
发文量
0
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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