树脂超声处理的新型涂层技术研究

Research on Novel Recoating Technology Using Ultrasonic to Treat Photosensitive Resin

为提高快速成形系统中堆积方向的制作分辨率，研究了光敏树脂的黏度、表面张力及固液两相接触角随超声处理时间和功率的变化规律。试验结果表明：LPR2001型光敏树脂在超声处理开始的2～5min，树脂的黏度、表面张力及接触角迅速减小；随处理时间延长，以上树脂特性值随之回升；超声功率在40～50W时，树脂的黏度、表面张力及接触角减小幅度最大。对光敏树脂超声处理前后能实现的最小涂层厚度进行了实验对比，结果表明：超声处理的树脂能将最小涂层厚度由原来的0．02mm降低到0．01mm。

In order to increase the building resolution of stereolithography system in Z direction, a novel recoating method was proposed, where photosensitive resin was treated with ultrasonic to de- crease the minimum thickness of the resin layer. Experiments were carried out to investigate the influence of ultrasonic treatment parameters on the floating property of resin. The experimental results in dicate that viscosity, surface tension and contact angle decrease rapidly in the beginning 5 minutes; and then viscosity, surface tension and contact angle increase with the treatment time. When the ultrasonic power is in the range of 40-50W the decrease magnitude of viscosity, surface tension and contact angle reach the maximum. The results of the recoating experiments demonstrate that the novel recoating method can produce thinner resin layer with a thickness of 0.01mm than recoating method （0.02mm） which does not treat resin.