Designing of NIR-Reflective Black Material and Recycling of Waste Solution as Fillers for Epoxy Molding Compound

초록

In this study, single-shell hollow black titania (SHBT) is successfully synthesized as highly NIR-reflective materials using a combination of sol-gel, NaBH4 reduction, and etching methods. Additionally, waste solution generated from etching silica core is collected and recycled to fabricate silica nanoparticles, which is then used as filler in epoxy molding compound (EMC). The SHBT is mixed with transparent hydrophilic varnish and coated onto a glass substrate. The SHBT-painted glass substrate exhibits true blackness (L* = 13.0) along with high near-infrared (NIR) reflectance (30.7 R%). This is attributed to the difference in refractidve index between air and black titania. In the practical LiDAR application, the SHBT-painted substrates is successfully detected by LiDAR sensors. Moreover, the waste solution generated during the synthesis of SHBT is converted into silica nanoparticles, which are combined with epoxy resin and carbon black to fabricate the EMC. As a result, the handmade EMC exhibits similar properties to those of commercial EMC. In this regard, this study presents a dual application strategy for utilizing both NIR-reflective black materials and EMC fillers. Key words: Black titania, Near-infrared, LiDAR sensor, Recycling, Epoxy molding compound 사사 본 연구는 2025년도 정부(교육부)의 재원으로 한국연구재단의 지원을 받아 수행된 기초연구사업임 (RS-2022-NR070869)