很多人一看化妆品里面有乳化剂，三乙醇胺就觉得这个护肤品不行，会伤害皮肤。其实化妆品里面的三乙醇胺是一种乳化剂。如果没有三乙醇醇胺的话，水和油是不能混到一块的。 三乙醇胺具有叔氨的性质。碱性比氨低能吸收二氧化碳和硫化氢。其水溶液呈碱性。能与无机酸和有机酸反应生成盐。还能和高级脂肪酸形成脂。可以用于美容品的原料，护肤品化妆品原料。所以护肤品含三乙醇氨是可以使用的。致癌的说法更没听说过。
在化妆品（包括皮肤洗涤、眼胶、保湿、洗发剂等）中三乙醇胺用作乳化剂、保湿剂、增湿剂、增稠剂、PH平衡剂。在化妆品配方中用于与脂肪酸中和成皂，与硫酸化脂肪酸中和成胺盐。三乙醇胺是乳膏制剂中常用乳化剂，用三乙醇胺乳化的乳膏产品具有膏体细腻，膏体亮白的特点，另三乙醇胺与高级脂肪酸或高级脂肪醇形成的胶体相稳定性好，产品质量稳定，可容外加成分比重高。三乙醇胺是含有卡波姆等酸性高分子凝胶的最常用中和剂，三乙醇胺通过与卡波姆等羧基中和，形成稳定的高分子结构，达到增稠和保湿的应用效果。看到这边，你应该知道化妆品里面的三乙醇胺到底能发挥什么样的作用。
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