Citation: Huang Min, Jiang Dahong. Preparation of Dilauric Acid Thiodiglycol Ester and Evaluation of Its Antioxidant Capacity in Polypropylene Resin[J]. Chemistry, ;2016, 79(1): 37-42. shu

Preparation of Dilauric Acid Thiodiglycol Ester and Evaluation of Its Antioxidant Capacity in Polypropylene Resin

Huang Min ,
Jiang Dahong ^,

1.
Department of Chemical Engineering, Guangdong University of Petrochemical Technology, Technology & Development Center for Petrochemical Pollution Control & Resources Utilization of Guangdong University, Maoming 525000

Corresponding author: Jiang Dahong,
Received Date: 8 April 2015
Available Online: 28 July 2015
Fund Project:

A new antioxidant dilauric acid thiodiglycol ester is prepared in high yield starting from thiodiglycol and lauric acid catalyzed by p-toluenesulfonic acid. The optimized reaction condition is as follows:using xylene to remove water azeotropically with reaction temperature at 140℃, molar ratio of thiodiglyol to lauric acid at 2:1.5, and loading of catalyst at 2% by weight of lauric acid. The antioxidant activity of the product is investigated and compared with other commercially available antioxidants. The results show that when dilauric acid thiodiglycol ester is used as antioxidant additive, the melt flow index (MFI) of polypropylene powder decreases sharply from 5.36 g·10min^-1 to 3.59 g·10min^-1, and elongation at break and impact strength also reach a high level to 112.2% and 121.0kJ·m^-2. The blending of dilauric acid thiodiglycol ester with commercially available antioxidant 1010 or 168 can further improve the antioxidant performance. Tensile strength of 40.2 MPa, elongation at break of 140.8% and impact strength of 124.2kJ·m^-2 are obtained when dilauric acid thiodilglycol ester is combined with 168, while MFI decreases to 3.56g·10min^-1 and 3.28g·10min^-1 when it is combined with 1010 and 168, respectively.
- Antioxidant,
- Dilauric acid thiodiglycol ester,
- Polypropylene,
- Melt flow index,
- Tensile strength,
- Elongation at break
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沈阳化工大学材料科学与工程学院沈阳 110142