关键词: 三羟基硬脂精, 香波, 悬浮, 温和

Abstract:

Trihydroxystearin is a kind of food additive which is safe and inexpensive. It has been widely used as an anti-crystallizer for many types of oils, such as vegetable oil and edible salad oil. In daily chemical products, trihydroxystearin can effectively provide thixotropy and prevent the occurrence of sedimentation. Recent research has shown that it can be used as a suspending agent in wash and protect, two-in-one shampoos. As a suspending agent, trihydroxystearin is effective to suspend silicone oil, pearlescent agents, anti-dandruff agents and other shampoo components. Compared with other commonly used suspending agents for shampoos, trihydroxystearin is more convenient and has less influence on the physical and chemical properties of the shampoos. Herein, a comparative study for the application of trihydroxystearin and other suspending agents, such as carbomer （Carbomer 940）, acrylate/C_10~30 alkyl acrylate cross-linked polymer （Ultrez 21）, acrylate copolymer （Aqua SF-1） and dihydrogenated tallow phthalic acid amide （TAB-Ⅱ）, in 2-in-1 shampoo was made. Carbomer 940 and Ultrez 21 tend to absorb moisture and agglomerate. For Aqua SF-1, it is difficult to eliminate the foam produced by shearing and stirring in large-scale production, which leads to long de-foaming time and high energy consumption. TAB-Ⅱ can reduce the foaming properties and cleaning ability of shampoos. Therefore, trihydroxystearin is more suitable for use as a suspending agent in a lotion, and as a stabilizer in a two-in-one shampoo compared with the chemicals mentioned above. The results show that, stable two-in-one shampoo can be made by adding 0.2% trihydroxystearin as the suspending agent, the amount of which is less than other suspending agents. The safety of trihydroxystearin was studied by using the red blood cell hemolysis test and the human safety patch test. The results show that trihydroxystearin can decrease the irritation of surfactants in the red blood cell hemolysis test, and it has not irritation to the skin in the human safety patch test, indicating that it is safe. Finally, the sensory evaluation of the shampoo with trihydroxystearin was carried out. It is found that there is no significant difference in the feeling of washing in the sensory evaluation test versus other products. In conclusion, trihydroxystearin is more convenient and effective as a suspending agent in the shampoo, and it is safe and has less impact to the physical and chemical properties of the shampoo than other chemicals.

Key words: trihydroxystearin, shampoo, suspension, mildness