Today's washing liquid is basically mixed with a variety of surfactants

2021-05-31 11:21:09

Amino acid surfactants show good biodegradability, biocompatibility and high safety. They can be decomposed into fatty acids and amino acids by enzymes in human body. The results showed that sodium N-acyl amino acid had less irritation and higher safety than sodium dodecyl sulfate.

Because of the existence of hydroxyl or unsaturated bond in the acyl chain, amino acid surfactants have bactericidal effect, and the antibacterial activity increases with the increase of hydroxyl and unsaturated bond. The results showed that N-acyl amino acid surfactant had good antibacterial activity against Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli, and the effect of pH on antibacterial activity was investigated. The results showed that N-acyl amino acid surfactant had good antibacterial activity against these three kinds of bacteria, and the antibacterial activity decreased when pH > 6.

Similar to other traditional surfactants, amino acid type surfactants have good emulsifying, wetting, solubilizing, dispersing and foaming properties. According to Qian Huichao et al. Study on the hard water resistance of 0.05% mass fraction of coconut oil methyl sodium taurine, the foam height in 1500mg/Kg hard water condition is almost the same as that in pure water, about 1700mm.

Today's washing liquid is basically mixed with a variety of surfactants. It's not accurate to say that there is no ionic surfactant at all. In fact, there are also fatty alcohol polyoxyethylene ether sodium sulfate (AES). The stimulation of AES at low concentration was very weak.

In addition, cocoamidopropyl betaine (cab35) is an amphoteric surfactant with weak irritation, which is often used in recent years. And so on. The surfactant to be phased out is LAS, that is, sodium alkylbenzene sulfonate. However, I think low-grade products in China are still in use. The cost of Las itself is very low, and the decontamination effect is very good, but its own toxicity is a little higher than the previous several. Surfactant family is very large. In theory, any surfactant has the potential to be used as detergent, which may involve no more than cost, effect and toxicity. So now it can't be said that the washing liquid or washing powder on the market must contain a certain surfactant.