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The foaming capability, which is related to the ratio of surfactants, the dosage and the crystallization rate of ethylene glycol distearate (EGDS), is discussed. By the same progress, with the proportion of ammonium lauryl sulfate (AESA) being increased, the foam height of the body care product is linearly improved. The crystal features of EGDS and pearlescence quality of the body care products are strongly linked to the surface aspect, the size distribution of EGDS crystals and their level of aggregation. Comparing the different crystallization processes, when rapidly being cooled with cold water and stirred at the speed of exceeding to 1 000 rpm, the aggregation of the crystals is decreased, and the pearlescence of the body care product is poor. When being ordinary cooled at room temperature and stirred at the speed of no more than 500 rpm, the aggregation of the crystals is increased, and the pearlescence of the body care products is obvious. The microstructures reveal that the oil drops are pierced to smaller by the EGDS needle crystals. Then the smaller oils act as antifoaming agents to cut down the foam height of the body care product. Consequently, the foam height of the body care products with good pearlescent effect is decreased. Furthermore, being added silicone oil emulsion, the foam height falls faster because of demulsifying. The result shows that the silicone oil and the needle-like crystals have a negative synergistic effect on foaming in the body care products.

Negative Synergistic Effect on Foaming in Body Care Products with Silicone Oil and the Needle-Like Crystal of Ethylene Glycol Distearate