兼具自修复和自消光性能的光固化聚氨酯涂层的制备与性能研究  

Preparation and Characterization of UV-curable Polyurethane Coating with Self-healing and Self-matting Properties

作　　者：胡国锋 俞乐 杨鹏微 周建萍[1] 赵春辉 梁红波[1] HU Guofeng;YU Le;YANG Pengwei;ZHOU Jianping;ZHAO Chunhui;LIANG Hongbo(School of Materials Science and Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学材料科学与工程学院,南昌330063

出　　处：《涂料工业》2024年第9期38-44,共7页Paint & Coatings Industry

基　　金：国家自然科学基金(52163004,52063022)。

摘　　要：采用联苯型双马来酰亚胺和糠醇合成了含Diels-Alder(DA)结构的联苯型二元醇,然后利用该二元醇与异佛尔酮二异氰酸酯、聚四氢呋喃及丙烯酸羟乙酯为原料制备了光固化自修复聚氨酯树脂,利用FT-IR和1H NMR对产物结构进行了表征,并测定了树脂光固化过程中的双键转化率,研究了DA二元醇用量对涂层性能的影响。结果表明:DA含量越大,涂层微相分离越明显,自消光效果越好,且涂层的自修复效果越显著,涂层修复后表面粗糙程度增大,光泽下降,涂层在修复3~4次后光泽趋于稳定。此外,随着DA含量的增加,涂层的玻璃化转变温度(T_(g))增大,且出现了2个T_(g)。当聚四氢呋喃与DA二元醇物质的量比为0.75∶1.25时,涂层兼具良好的自消光和自修复性能,损伤涂层经150℃修复后,划痕基本修复,光泽由初始光泽18.6下降至9.8,经3~4次修复后光泽稳定在4.5左右。A biphenyl diol containing a Diels-Alder(DA)structure was synthesized by reacting biphenyl bismaleimide with furfuryl alcohol.Subsequently,a UV-curable selfrepairing polyurethane resin was prepared by using this diol,isophorone diisocyanate,poly(tetrahydrofuran),and hydroxyethyl acrylate.The structure of resin was characterized by using FT-IR and 1H NMR.The double-bond conversion rate during the UV-curable process of the resin was determined via FT-IR analysis.The impact of the DA diol dosage on the coating properties was investigated.The results indicated that an increase in DA content led to more pronounced microphase separation in the coating,enhancing the self-matting effect and the self-healing properties of the coating.After healed,the surface roughness of the coating increased,accompanied by a decrease in gloss,The gloss of the coating was stable after 3 to 4 repairs.Moreover,an increase in DA content resulted in a higher glass transition temperature for the cured material,with the appearance of two distinct glass transition temperatures.When the material amount ratio of polytetrahydrofuran and DA diol was 0.75∶1.25,the coating exhibited excellent self-matte performance and self-repairing properties.When subjected to damage at 150℃,the coating was able to repair scratches effectively,with the gloss decreasing from the initial 18.6 to 9.8.After undergoing 3 to 4 rounds of repair,the gloss stabilizes at around 4.5.

关 键 词：光固化聚氨酯 自消光 微相分离 自修复 

分 类 号：TQ637.83[化学工程—精细化工]