A standard sample for detecting antioxidants in eps and preparation method thereof

Abstract

The invention discloses a standard sample for detecting an antioxidant in EPS (Expandable Polystyrene) and a preparation method thereof. The preparation method comprises the following steps: adding a proper amount of dispersing agent, an antioxidant, a fluorescent brightener and a lubricating agent into EPS serving as a main raw material to obtain an EPS substrate material; adding the antioxidant serving as a target compound to be detected into a solvent, mixing and dissolving uniformly, adding the mixture into the EPS substrate material, and continually mixing in a high-speed mixer; adding the mixture into a vacuum drying machine after mixing for vacuum drying; molding the dried material by a compression molding process, and cutting the molded material into blocks to obtain the standard samples. By adopting the preparation method, the problem that the structure of the antioxidant is damaged due to the attacks of free radicals in a hot processing process is solved, and a target substance can be uniformly dispersed in a substrate and can be protected from being damaged and lost to the maximum extent; by adopting the standard sample provided by the invention, the blank of the standard sample for detecting the antioxidant in China is filled up.

Description

technical field [0001] The invention relates to the field of detection of food contact materials, in particular to a standard sample for the detection of antioxidants in EPS and a preparation method thereof. [0002] technical background [0003] The safety of food-contact materials directly affects the quality of food. In recent years, food safety issues caused by food-contact materials have caused concern. Toxic and harmful substances remaining in food-contact plastic products have become an important source of food contamination. one of the sources. At present, in order to save costs, many unscrupulous merchants in the market often use waste and recycled materials, and illegally add processing aids such as antioxidants and fluorescent whitening agents during the processing to achieve the purpose of saving costs, changing the appearance and hue, and increasing aging resistance. . [0004] EPS (polystyrene foam), as a food contact material commonly used in daily life, is o...

AI Technical Summary

Problems solved by technology

However, antioxidants are easy to destroy the structure during resin processing (such as traditional melt extrusion and melt injection molding processes), causing the components to fail. At the same time, it is also required to use a processing method to ensure the uniformity and stability of the standard sample itself. Therefore, EPS antioxidants The processing of standard samples for testing is technically difficult

At the same time, due to the complex composition of EPS food contact materials, how to solve the problem of matrix effect and improve the reliability of test results is also a problem that needs to be solved at present.

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