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

摘要： 丙烯酸树脂成本低、耐候性好、成膜性优异，被广泛应用于建筑、皮革化工等领域。但其表面能高，力学性能较差，使应用受到限制。为改善这一不足，以丙烯酸酯为主要单体，甲基丙烯酸十二氟庚酯为功能单体，三羟甲基丙烷三丙烯酸酯(TMPTA)为交联剂，采用核壳乳液聚合法合成了水性含氟丙烯酸酯树脂。对反应条件进行了考察，并对乳液的稳定性、粒径以及乳液膜的拉伸强度、硬度、疏水角、化学结构、热稳定性能进行了表征。结果表明，TMPTA的加入可以有效提高乳液膜的拉伸强度、硬度和热稳定性。TMPTA质量分数为2%时，乳液的平均粒径为157.2 nm，转化率为97.7%，乳液膜的综合性能最好。此时吸水率为12.3%，失重率50%时的分解温度为394 ℃，疏水角为98.9°，拉伸强度为3.5 MPa，硬度为71.2 HA，与含氟丙烯酸树脂相比拉伸强度提高了159.2%，热稳定性能提高了34.6 ℃。

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