微流控芯片的紫外光固化注射成型工艺对微结构的影响

Effect of Molding Process Based on UV-curing Injection on Microstructure of Microfluidic Chips

研制了紫外(UV)光固化注射成型机,对微流控芯片的微结构复制度进行了研究。结果表明,提高保压压力,填充能力得到提升,复制度提高;光照强度对微结构复制度影响较小,原因是光照强度对收缩总量的影响较小;低黏度树脂混合物有利于微结构的填充,但是黏度过低会使得收缩量变大,复制度反而降低;与传统注射成型相比,该方法复制度较高。

A UV-curing injection molding prototype was developed, and the replication accuracy for the microstructure of a microfluidic chip was investigated. The results indicated that the filling ability and replication accuracy were improved with increasing hold pressure. Moreover, the intensity of UV irradiation was found to have little influence on the replication of microstructure because there were few effects on total shrinkage by UV irradiation. The low viscosity of the resin mixture was advantageous to the precise molding of microstructure. However, too low viscosity generated serious shrinkage, thus resulting in a decrease in replication degree. Compared with traditional injection molding, the UV-curing injection molding exhibits a much higher replication degree.