Analog Oxidation of Hunan Insect Wax on UV irradiation or Heating Conditions and Determination of Oxidation Products

doi:10.11924/j.issn.1000-6850.2014-0196

Abstract

Abstract: Hunan insect wax was an important part of Chinese white wax who called Sichuan insect wax. In order to promote development, utilization and scientific storage of Hunan insect wax, simulated oxidation and oxiditives on UV irradiation and heating condition were carried out to ascertain the properties, composition and oxidative characteristics of Hunan insect wax. 300nm UV irradiation and 50℃, 75℃ and 100℃ were selected for oxidation condition. Qualitative differences were reflected by detected to physicochemical index, TG and IR of oxidation products. Compositional analysis of fresh and oxidation Hunan insect wax was detected by GC-MS and varieties and components were ascertained. Oxidation degree and manner of UV-irradiation and heating to Hunan insect wax were explored by above-mentioned detection results. On this basis, comparison and analysis were made between fresh Hunan insect wax and oxidation insect wax. It showed that UV-irradiation and thermal oxidation both worked in the oxidized process of insect wax. During the oxidation of 45d, the oxidation effect was faintish under 300nm UV-irradiation and 50℃ thermal oxidation condition. Hunan insect wax was violently oxidized in the 100℃thermal effect. The acid value and saponification value was 69.38 mgKOH/g and 195.07 mg KOH/g, respectively. Hunan insect wax was oxidized and degraded in the oxidation process. Long carbon chain of Hunan insect wax was shortened and functional group was oxidized in the oxidation process.

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