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Development of New Spherical Silica as a Substitute for Microplastic Beads
Summary
This Japanese-language study describes the development of spherical silica particles as a skin-feel additive to replace microplastic beads in sunscreen and cosmetic products. Replacing synthetic microplastic beads in cosmetics with mineral-based alternatives directly prevents these particles from washing down drains and entering waterways.
日焼け止めやメイクアップ化粧料において，マイクロプラスチックビーズは，感触改良剤として広く使用されている。しかし近年は，マイクロプラスチック（MP）の環境流出による海洋汚染が国際的な問題として注目されており，MPビーズの代替原料が求められている。そこでわれわれは，この問題を解決すべく，環境に優しい素材としてシリカに着目し，感触特性に優れる球状シリカを開発した。そして，この感触特性に優れたシリカ粒子に対してベヘニルアルコールとジステアリルジモニウムクロリドを併用した複合多層処理を施すことで，MPビーズに近い「柔らかさ」をもつ，表面処理球状シリカの開発に成功した。
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