Cadmium-free Reds & Encapsulated Pigments
无镉红黄釉与包裹颜料替代
标签：无镉釉, 包裹颜料, REACH合规, 色料研磨, 出口检测
传统大红与镉黄依赖硫化镉颜料，出口欧盟受限。替代方案：①硫化硒镉颜料做 SiO₂/ZrO₂ 包裹处理（包裹率 >90%），780–830℃ 烧成时镉溶出可控制在 0.01 mg/L 以下；②完全无镉路线用金红、铁红呈色，色域窄但合规彻底。使用要点：包裹颜料不可过度研磨（超过 200 目会破坏包覆层）、不可与强乳浊釉混用。某出口首饰厂切换后色差 ΔE≈2，单价上升 15% 但通过 SGS 检测打开欧美市场。
Classic reds and cadmium yellows rely on CdS pigments, restricted for EU export. Alternatives: ① cadmium sulfoselenide encapsulated in SiO₂/ZrO₂ (>90% encapsulation) holds cadmium release below 0.01 mg/L at 780–830℃ firing; ② a fully cadmium-free route uses gold-ruby and iron-red colorants—narrow gamut but compliant. Handle with care: over-grinding beyond 200 mesh ruptures the coating, and strong opacifiers must be avoided. One export jewelry house switched at ΔE≈2—prices up 15%, but SGS clearance opened EU/US markets.