高固含低黏度生物基氟碳树脂的合成及性能

Synthesis and properties of biobased fluorocarbon resin with high solid content and low viscosity

将生物基原料氢化松香醇与三乙胺、对羟基苯甲醚、丙烯酰氯反应制备了可聚合的丙烯酸氢化松香醇酯,然后其与一系列丙烯酸及其衍生物通过共聚,制备了高固含低黏度生物基氟碳树脂。结合分子动力学模拟,分析了丙烯酸氢化松香醇酯降黏机理,探究了生物基氟碳树脂成膜后的涂膜性能。结果表明,随着丙烯酸氢化松香醇酯质量分数的增加,改性氟碳树脂运动黏度降低;当丙烯酸氢化松香醇酯质量分数为18.6%时,改性氟碳树脂固含量为78.56%,其运动黏度与石油树脂叔碳酸乙烯酯改性氟碳树脂相当,远低于不含大体积侧基的改性氟碳树脂;与叔碳酸乙烯酯相比,丙烯酸氢化松香醇酯的空间体积更大,侧基体积效应更明显,分子间作用力小,降黏效果好;丙烯酸氢化松香醇酯改性氟碳涂膜硬度、附着力高于叔碳酸乙烯酯改性氟碳涂膜,耐化学腐蚀性略低于叔碳酸乙烯酯改性氟碳涂膜。

Polymerizable hydroabietyl acrylate was prepared from the reaction of biomass raw material hydrogenated rosinol with triethylamine,p-hydroxyanisole and acryloyl chloride,and then copolymerized with a series of acrylates and their derivatives to obtain a bio-based fluorocarbon resin with high solid content and low viscosity.The viscosity reduction mechanism of hydroabietyl acrylate was analyzed by molecular dynamics simulation method.And the coating performance of bio-based fluorocarbon resin was further explored.The results indicated that the kinematic viscosity of modified fluorocarbon resin decreased with the increase of the mass fraction of hydroabietyl acrylate.When the mass fraction of hydroabietyl acrylate was 18.6%,the solid content of modified fluorocarbon resin was 78.56%,with its kinematic viscosity equivalent to that of fluorocarbon resin modified by vinyl neodecanoate but far lower than that of modified fluorocarbon resin without large volume side groups.Compared with petroleum resin vinyl neodecanoate,hydroabietyl acrylate exhibited larger space volume,more obvious side group volume effect,lower intermolecular interaction force and lower viscosity.In comparison to that modified by vinyl neodecanoate,fluorocarbon coating modified by hydroabietyl acrylate displayed higher hardness and adhesion,and slightly lower chemical corrosion resistance.