关键词: 水性含氟丙烯酸树脂, 　三羟甲基丙烷三丙烯酸酯, 　交联改性, 　疏水性, 　力学性能

Abstract: Acrylic resin is widely used in construction, leather chemicals and other fields because of its low cost, good weather resistance and excellent film formation. However, its surface energy is high and its mechanical properties are poor, which limits its application. In order to improve this deficiency, acrylate was used as the main monomer, dodecafluoroheptyl methacrylate was used as a functional monomer, and trimethylolpropane triacrylate (TMPTA) was used as a crosslinking agent, the hydrophobic fluorinated acrylic resin was synthesized by a shell emulsion polymerization method. The reaction conditions were investigated. The stability and particle size of the emulsion as well as the tensile strength, hardness, hydrophobic angle, chemical structure and thermal stability of the emulsion film were characterized. The results indicate that the addition of TMPTA can effectively improve the tensile strength, hardness and thermal stability of the emulsion film. When TMPTA accounts for 2% of shell monomer mixture, the average particle size of the emulsion is 157.2 nm, and the conversion rate is 97.7%. The comprehensive performance of the emulsion film is best: the water absorption rate is 12.3%, and the decomposition temperature is 394 °C when the weight loss rate is 50%. The angle is 98.9°, the tensile strength is 3.5 MPa, and the hardness is 71.2 HA. Compared with the fluorine⁃containing acrylic resin, the tensile strength is increased by 159.2%, and the thermal stability can be improved by 34.6 °C.

Key words: Hydrophobic fluorinated acrylic resin, Trimethylolpropane triacrylate, Cross?linking modification, Hydrophobic, Mechanical properties