基于迈克尔加成原理的涂层制备研究

Research on Preparation of Coatings Cured via Michael Addition Reaction

为提高迈克尔加成涂层的耐热性,以及探究树脂结构对涂层性能的影响,通过缩聚反应合成了固体丙二酸酯树脂和乙酰乙酸酯树脂,与多官能度的丙烯酸酯固化,制备了系列基于迈克尔加成原理的涂层,并研究了上述树脂及涂层的性能。结果表明:树脂的玻璃化转变温度(T_(g))分别为51.0℃和31.3℃;涂层T_(g)在18.8~24.4℃(DMA测得),较常规迈克尔加成涂层有明显的提升,主要归功于采用高T_(g)固体树脂;乙酰乙酸酯树脂制备的涂层较丙二酸酯树脂制备的涂层有更高的T_(g)和热稳定性,可能源于更高的交联密度;而乙酰乙酸酯树脂制备的涂层拉伸强度、杨氏模量相对更低,可能是因为涂层结构中含有大量柔性固化剂组分。

In order to improve the heat resistance of coatings cured through Michael addition reaction and investigate the effect of resin structure on the coatings performance,solid malonate resin and acetoacetate resin were synthesized by polycondensation,which were cured with multifunctional acrylate via Michael addition reaction to prepare a series of coatings.The results showed that the glass transition temperature(T_(g))of the as-synthesized resins was 51.0℃and 31.3℃respectively and T_(g)of the coating is 18.8~24.4℃,which was significantly higher than that of reported coatings cured via Michael addition reaction,mainly due to incorporation of high T_(g)solid resin.The coatings prepared using acetoacetate resin indicated higher T_(g)and better thermal stability than that prepared using malonate resin,which might be due to higher crosslinking density in former coatings,while the tensile strength and modulus of the coatings prepared using acetoacetate resin were relatively lower,which might be due to a large number of flexible curing agent components in the coatings structure.