Clearning performance and foaming properties of lauroylamidopropylbetaine/nonionics mixed systems |
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| Authors: | Takamitsu Tamura Tadashi Iihara Shigeo Nishida Seiich Ohta |
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| Affiliation: | (1) Better Living Research Laboratory, Lion Corporation, 132 Tokyo, Japan;(2) Material Science Research Center, Lion Corporation, 7-13-12, Hirai, Edogawa-ku, 132 Tokyo, Japan |
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| Abstract: | Lauroylamidopropylbetaine (LPB) has good cleaning and foaming performance with excellent low skin irritation. We have investigated
the relationship between cleaning performance and foaming properties of aqueous solutions containing binary and ternary LPB/nonionic
surfactant systems. Foaming properties were evaluated by observing dynamic surface tension and aqueous core thickness of a
vertical foam film measured by Fourier transform infrared spectroscopy. The LPB/lauroyldiethanolamide (LDE) system has a positive
synergistic effect on cleaning performance and foam stability, estimated from the grease removal test and dishwashing test
for a light-duty detergent. However, this system shows very poor initial foam performance in both the sponge test and Ross-Miles
foam test. This disadvantage of the LPB/LDE system was improved using C12En (polyoxyethylene dodecyl ethers). Addition of
C12En promoted dynamic surface tension lowering, indicating an improvement in the initial foaming performance, while maintaining
cleaning performance and foam durability. Thus, the LPB/LDE/C12En ternary system has an excellent cleaning and foam performance
as a light-duty liquid detergent. |
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| Keywords: | Detergency dishwashing performance dynamic surface tension darainage foaming lauroylamidopropylbetaine liquid detergent nonionic surfactant surface tension surfactant |
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