月桂酰甲基羟乙基磺酸钠在清洁产品中的性能研究

Study on Properties of Sodium Lauroyl Methyl Isethionate in Cleansing Product

研究了化妆品新原料月桂酰甲基羟乙基磺酸钠的增稠、透明度和去污力,并与常见的温和表面活性剂进行性能对比。将8%主表面活性剂与4%椰油酰胺丙基甜菜碱复配,通过氯化钠对黏度的影响考察各个表面活性剂增稠的难易程度。实验结果表明,0.5%的盐即可增稠月桂酰甲基羟乙基磺酸钠至5000 mPa·s,而常见的氨基酸类阴离子表面活性剂需要较多盐才能增稠或者难以用盐增稠。考察了室温和4℃下,6%表面活性剂水溶液在pH值5~8范围内的透明度。实验结果表明,月桂酰甲基羟乙基磺酸钠具有良好的透明度,而常见的氨基酸类阴离子表面活性剂中,除月桂酰肌氨酸钠以外均会因温度或pH值变化出现不同程度的不透明或者析出现象。通过使用0.05%表面活性剂水溶液清洁皮脂污布,测量清洗前后污布白度差值衡量其对于皮脂的去污力。实验发现月桂酰甲基羟乙基磺酸钠去污力强于大部分氨基酸类阴离子表面活性剂,接近月桂醇聚醚硫酸酯钠(SLES)和甲基椰油酰基牛磺酸钠。

The properties of sodium lauroyl methyl isethionate,an approved new cosmetics ingredient,including its thickening capabilities,transparency characteristics,and sebum removal efficacy were explored and compared to commonly employed mild surfactants.The 8%main surfactant and 4%cocamidopropyl betaine were compounded,and the thickening difficulty of each surfactant was investigated by the effect of sodium chloride on viscosity.The results indicated that sodium lauroyl methyl isethionate can achieve a viscosity of up to 5000 mPa·s by 0.5%salt supplementation,whereas conventional amino acid anionic surfactants necessitate greater salt concentrations or exhibit resistance to thickening by salt.The transparency of 6%surfactant aqueous solution within the pH range of 5 to 8 was investigated at room temperature and at 4℃.The experimental results showed that sodium lauroyl methyl isethionate has excellent transparency.However,apart from sodium lauroyl sarcosinate,changes in temperature or pH values result in different degrees of opacity or precipitation phenomena among common amino acid anionic surfactants.To evaluate its effectiveness in removing sebum stains,the degreasing power of a 0.05%surfactant aqueous solution is assessed by measuring the difference in whiteness values of the cloth before and after cleaning.The experiment found that sodium lauroyl methyl isethionate has stronger degreasing power than most amino acid anionic surfactants,approaching that of sodium laureth sulfate(SLES)and sodium methyl cocoyl taurate.