This paper studies the material migration and barrier properties of three commonly used PE, PP and PET cosmetic plastic bottles from the following three aspects:

1. The dissolved substances of three materials were qualitatively studied by UV-Vis spectroscopy, pH value method, reduction oxidation method, non-volatile matter method and heavy metal colorimetric method. The results show that the migration of the three substances in the water extract is small and can be used in cosmetics. The migration of pet in ethanol is relatively large, so it is not suitable for direct use in cosmetics containing alcohol bases, while PP is especially unsuitable for cosmetics containing oil bases.

2. The content and migration law of antioxidants 1010, 168, 330 and 1076 in polyethylene (PE) and polypropylene (PP) were studied by high performance liquid chromatography. The results showed that the content of antioxidant 1010 in polyethylene and polypropylene was 0.018% and 0.019%, respectively, without antioxidants 168, 330 and 1076. Antioxidant 1010 did not migrate to isooctane, and the migration of acetaldehyde in PET was studied by gas chromatography. The results show that the acetaldehyde residue of this material is lower than the acetaldehyde residue limit of PET bottles in food packaging and pharmaceutical packaging.

3. The water vapor permeability and ethanol permeability of three cosmetic plastic bottles of polyethylene (PE), polypropylene (PP) and polyester (PET) were studied by gravimetric method, and the oil permeability of the three materials was investigated. test. The results show that PE and pet have better water and ethanol barrier properties, PP has better water barrier properties, but ethanol barrier properties are poor. Compared with the other two materials, pet has the best barrier properties to ethanol, while PP has the best barrier properties to water vapor.

Based on the evaluation of the three materials, PE is more suitable for containing water-based, alcohol-based or oil-based cosmetics, and the amount of material migrated into the cosmetic simulant is small, which has limited impact on cosmetic ingredients; PP can contain water-based cosmetics, but if it is If you hold alcohol-based cosmetics, the active ingredients will volatilize faster and the validity period will be relatively shorter. Pet can hold water-based and oil-based cosmetics. If you hold alcohol-based cosmetics, it will dissolve substances that affect the performance of cosmetics. On the market, most alcohol-containing cosmetics, such as toners, lotions, toners, etc., are packaged in PET bottles. Oil-based lotions, creams, etc. are also mostly used in PP bottles.