聚酯粉末涂料的折光系数高、流动性较差，导致其透明度和流平性不足，因此在聚酯树脂合成时引入自由基溶液聚合制备的丙烯酸预聚体，并采用红外光谱仪和 X射线衍射仪表征其化学结构及组成，研究丙烯酸预聚体用量、酸值、黏度和玻璃化转变温度（ T_g）对丙烯酸改性聚酯树脂及其粉末涂料的外观、透明度、力学性能、贮存稳定性等的影响。结果表明：成功制备了丙烯酸改性聚酯树脂；合成中添加 10%酸值为 30 mgKOH/g、黏度约 1 720 mPa·s、T_g约为 45. 6 ℃的丙烯酸预聚体，所得丙烯酸改性聚酯树脂涂层相比于常规的聚酯树脂涂层，具有更高的透明度和倾斜流动性，更佳的耐水性和耐候性，同时兼顾力学性能和贮存稳定性。

Due to the high refractive coefficient and poor fluidity of polyester powder coatings，their transparency and leveling property were insufficient. Therefore，during the synthesis of polyester resin，acrylic prepolymers prepared by free radical solution polymerization were introduced，then polyester resin chemical structure and composition werecharacterized using infrared spectrometer and X-ray diffractometer. The effects of amount ofacrylic prepolymer，acid value，viscosity，and glass transition temperature（T_g） on the appearance，transparency，mechanical properties，and storage stability of acrylic modifiedpolyester resin and powder coating were studied. The results showed that acrylic modifiedpolyester resin had been successfully prepared. In the synthesis，10% of an acrylic prepolymer with an acid value of 30 mgKOH/g，a viscosity of approximately 1 720 mPa·s，and T_g of about 45. 6 ℃ was added. The resulting acrylic modified polyester resin coatings exhibited highertransparency and sloping flow compared to conventional polyester resin coatings，along with better water resistance and weathering resistance，while also maintaining mechanical properties and storage stability.