撞针式压电喷射高黏硅橡胶的3D打印工艺OA

To improve the printability of high-viscosity polymers and mitigate edge-beading effects in 3D printing,the research group introduced an on-demand jetting strategy based on a needle-type piezoelectric jetting valve.A Polydimethylsiloxane(PDMS)composite system was employed as the printing ink,and the influences of rheological properties,piezoelectric driving waveform,and glue supply pressure on microdroplet deposition behavior were systematically analyzed.The results reveal the quantitative effects of ink mass ratio,driving energy,and related parameters on droplet diameter,and identify that a mass ratio of SE1700 to Sylgard 184 of 8∶2 provides a suitable balance between rheological behavior and stacking stability.Through precise parameter control,stable deposition of microdroplets with a diameter of approximately 416 μm was achieved,enabling the fabrication of PDMS microporous films with uniform thickness,surface hydrophobicity,and excellent mechanical properties(elongation at break＞150%).These findings demonstrate the feasibility of this strategy for micro-scale forming of high-viscosity materials and provide a reference for the conformal fabrication of flexible electronic devices on complex curved surfaces.