Synthesis and Physical Property of Multi-Functional Siloxane Protective Coating Materials Applicable for Electronic Components

E-mail: hyeonmo@yonsei.ac.krReceived October 15, 2013, Accepted February 10, 2014Four multialkoxy-functionalized siloxane base-polymers (BP-1~4) were synthesized through either hydro-silylation or condensation reactions in order to prepare multi-networked siloxane polymers having appropriatephysical properties for protective coating in fabrications of electronics. Formulations of 4 base-polymers gavecoating materials A and B. Product A showed well-controlled flowing and leveling properties, and product A-2 was successfully applied to protective insulating coating for junction areas of connectors and chips in PDPcontroller. Tack free time, extrusion rate, dielectric breakdown voltage, hardness, thermal stability, waterresistance and flame resistance of products A and B were examined.Key Words : Self-leveling, Flowing, Thixotropy, Multi-crosslinking, Siloxane coating IntroductionBased on the evolution of semiconductors and integratedcircuits, electronics’ sizes have been shrunk and their com-plexity has increased, which results in requiring develop-ment of new materials. For materials to coat highly integ-rated connections of PCB (printed circuit board) assemblylike ultra slim pattern, nano-scale pattern and ultra smallgap, many specific properties, such as flow and levelingrates, curing rate, dielectric strength, weather resistance,thermal stability, flame resistivity, and robotic dispensableextrusion rate, are required.