Influence of NaCl on the Properties and Performances of Sodium Lauroyl Glycinate
The effect of NaCl on the surface chemical properties as well as the application performances of sodium lauroyl glycinate(SLGly)was investigated in this paper.The 30 wt%SLGly-NaCl solution became turbid at 30°C when the NaCl content increased to wNaCl:wSLGly of 8:92,and became increasingly turbid with the increase of NaCl content,indicating that NaCl was not conducive to the dissolution of SLGly in water.The cmc and γcmc of SLGly were 5.62 mmol/L and 40.5 mN/m,respectively,and gradually decreased with the increasing NaCl content.The foamability and foam stability of SLGly gradually decrease with the increase of NaCl content in the range of wNaCl:wSLGly from 0:100 to 8:92,otherwise progressively increase in the range of 8:92 to 20:80.Meanwhile,the emulsification of SLGly gradually increased with increasing NaCl content in the range of wNaCl:wSLGly from 0:100 to 8:92,and decreased progressively with increasing NaCl content in the range of 8:92 to 20:80.Both the wettability and detergency of SLGly gradually decreased with the increasing NaCl content.
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