高固含低粘度生物基氟碳树脂的合成及性能

合成高固含低粘度氟碳树脂是改善溶剂型氟碳防腐涂料环保性的重要途径之一。以生物基原料氢化松香制备出可聚合的丙烯酸氢化松香醇酯单体，进一步采用自由基聚合方法制备出高固含低粘度生物基氟碳树脂，结合分子动力学模拟方法，分析丙烯酸氢化松香醇酯降粘机理，并探究生物基氟碳树脂成膜后涂膜性能。研究表明，随丙烯酸氢化松香醇酯单体含量的增加，改性氟碳树脂粘度降低；当丙烯酸氢化松香醇酯单体含量为18.6%时，改性氟碳树脂固含量为78.56%，其运动粘度与叔碳酸乙烯酯单体单体改性氟碳树脂相当，远低于不含大体积侧基的改性氟碳树脂；与石油树脂叔碳酸乙烯酯单体相比，丙烯酸氢化松香醇酯单体空间体积更大，侧基体积效应更明显，分子间相互作用力小，降粘效果好；丙烯酸氢化松香醇酯改性氟碳涂料体系硬度、附着力高于叔碳酸乙烯酯改性氟碳涂料，耐化学腐蚀性略低于叔碳酸乙烯酯改性氟碳涂膜。

Synthesis and Properties of High Solid Content and Low Viscosity Biobased Fluorocarbon Resin

The synthesis of high solid content and low viscosity fluorocarbon resin is one of the important ways to improve the environmental protection of solvent based fluorocarbon anti-corrosion coatings. Polymerizable acrylic hydrogenated rosin ester monomer was prepared by hydrogenating rosin from biomass raw materials, and high solid content and low viscosity bio-based fluorocarbon resin was further prepared using free radical polymerization method. The viscosity reduction mechanism of acrylic hydrogenated rosin ester was analyzed using molecular dynamics simulation method. And the coating performance of bio-based fluorocarbon resin was explored. It is indicated that with the increase of monomer content of acrylic hydrogenated rosin alcohol ester, the viscosity of modified fluorocarbon resin decreases. When the monomer content of acrylic hydrogenated rosin alcohol ester is 18.6%, the solid content of modified fluorocarbon resin is 78.56%; its kinematic viscosity is equivalent to that of fluorocarbon resin modified by tert ethylene carbonate monomer, and far lower than that of modified fluorocarbon resin without large volume side groups; Compared with petroleum resin tert ethylene carbonate, hydrogenated rosin acrylate monomer has larger space volume, lower intermolecular interaction force and lower viscosity; The hardness and adhesion of fluorocarbon coatings modified by acrylic hydrogenated rosin ester are higher than those modified by tert ethylene carbonate, and the chemical corrosion resistance is slightly lower than that of tert ethylene carbonate modified fluorocarbon coatings.