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China Surfactant Detergent & Cosmetics ›› 2022, Vol. 52 ›› Issue (9): 920-929.doi: 10.3969/j.issn.1001-1803.2022.09.002

• Basic research • Previous Articles     Next Articles

“Jelly” phenomenon rheology study and improvement in shampoo system

Liang Yihuan,Du Jing*()   

  1. Croda China Trading Co., Ltd., Shanghai 200000, China
  • Received:2021-10-25 Revised:2022-08-23 Online:2022-09-22 Published:2022-09-23
  • Contact: Jing Du E-mail:yvonne.du@croda.com.

Abstract:

“Jelly” phenomenon of two combined surfactant systems (SLES+CAPB and LS+CAPB) within temperature range of 0 ℃ to 40 ℃ were studied via two types of dynamic rheology tests, temperature sweep and frequency sweep. The results show that the phenomenon is mainly caused by the mechanism of wormlike micelles self-thickening structure. They both happen to appear in SLES+CAPB bases and LS+CAPB bases. The gelation range demonstrated by dynamic temperature constant frequency sweep appears in the systems which generates capability to form wormlike micelles. And the addition of Versathix (PEG-150 Pentaerythrityl Tetrastearate (and) PPG-2 Hydroxyethyl Cocamide) can intensify the phenomenon because its anchor chemical structure helps to build up the 3D network in between wormlike micelles and to consolidate its entangled transient interspace micellar structure. The systems with wormlike micelles can be verified by dynamic frequency constant temperature sweep and draw the graph of ‘Cole-Cole’ curve with the result of Maxwell trend. All over the trials, viscosity of SLES+CAPB systems could be thickened by sodium chloride with salt shielding effect to form wormlike micelles self-thickening structure. However, viscosity of LS+CAPB system can only form wormlike micelles with a certain low pH range. On the other hand, systems which can only form spherical micelles do not show gelation range according to temperature sweep results, even in those systems using a large use level of Versathix. The systems containing spherical micelles thickened by Versathix show Maxwell trend in ‘Cole-Cole’ curve transferred from the results of dynamic frequency constant temperature sweep as well. This is due to the network effect provided by the thickener. The microstructural difference of wormlike micelles and Versathix thickening systems were confirmed via characterization with Cryo-TEM images. In shampoo formulations, applying 0.5% use level of emollients with good solubilities may help to reduce “jelly” phenomenon during low temperature condition. However, some of those emollients may influence on viscosity at room temperature. According to the study results, Cromollient SCE (Di-PPG-2 Myreth-10 Adipate) out of other ingredients can help to reduce this phenomenon with practical applying significance. Cromollient SCE does not influence much on system viscosity within room temperature range. And it can keep good clarity even using in surfactant systems. In addition, this ingredient can work as hair conditioning agent and help to reduce irritation mitigation in surfactant-based systems with additional benefits.

Key words: shampoo, low temperature, gelation, rheology behaviour, viscoelastic, wormlike micelles

CLC Number: 

  • TQ658