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化学烫发水通常为用氨水或烷基醇胺调节pH值范围在8.9～9.5的巯基乙酸的水溶液。巯基乙酸是作为还原剂用的,它能还原头发中组成角质朊的胱氨酸为半胱氨酸,而使头发柔软,然后在机械力(卷轴)作用下,将其卷曲成所需的式样。已发现能产生这一效果的不光是巯基乙酸,另外如硫代硫酸盐、亚硫酸盐、2-巯基乙醇、巯基丙三醇等在碱性介质中也能使胱氨
The chemical perm lotion is usually an aqueous solution of thioglycolic acid with a pH range of 8.9-9.5 adjusted with ammonia or alkanolamine. Thioglycolic acid is used as a reducing agent to reduce cysteine in the hair by making cystine, which constitutes keratin, to soften the hair and then curl it into the desired pattern under mechanical force (reeling) . It has been found that not only is thioglycolic acid, but thiosulfate, sulfite, 2-mercaptoethanol, mercaptopropanetriol and the like can also cause cystamine