The basic feature of surfactants is that they can significantly reduce the surface tension of solvents

2021-11-19 15:57:48

The basic feature of surfactants is that they can significantly reduce the surface tension of solvents. Generally, alkyl glycosides with alkyl carbon chain length greater than 8 carbons have surface activity and critical micelle concentration (CMC). With the growth of alkyl carbon chain, the surface tension of alkyl glycosides decreases significantly, and the cmc value also decreases, indicating that their activity is significantly improved. By comparing alkyl glycosides with polyoxyalkylene fatty alcohol (LAE) and sodium linear alkylbenzene sulfonate (LAS), as shown in Table 3, it can be seen that the cmc value of 12 carbon alkyl glycosides is low, indicating that they have good surface and interface properties.

The decontamination ability of surfactant changes with the change of ion type, washing condition and dirt type. The sebum dirt on polyester cotton is sensitive to non-ionic detergent. The decontamination ability of APG is equivalent to that of fatty alcohol polyoxyethylene ether sodium sulfate (AES), and is better than that of straight chain sodium alkyl sulfonate (LAS), sodium alkyl sulfonate (as) and sodium secondary alkyl sulfonate (SAS).

The foam performance of surfactant is mainly manifested in its foam stability and foaming property. 5 beet cylinders of the same range (100ml) were allocated to 0.1% APG, twelve alkyl sulfate (SLS), sodium lauryl sodium (LS- 30), coconut amide propyl betaine (CAB) and a- alkene sulfonate (AOS- 92) respectively. The water was poured into the measuring cylinder at 10 locations, respectively, and then they were placed in the table to observe the foam height of each surfactant. See Table 2 for specific data.

The following conclusions can be drawn from the above experiments:

① If APG and K12 are properly compounded, they can play the role of synergistic foaming, and on the premise of the same total amount of foaming agent, when APG: K12 = 1:1, the foaming amount is large;

2. After the combination of APG and K12, the overall taste of toothpaste will be improved, and the foam will be more delicate, softer and less irritating.

With the gradual development of oral care products industry towards mild, green and natural direction, alkyl glycosides will be widely used and developed in China.