Method for identifying high impact polystyrene plastic recycled material

Abstract

The invention discloses a method for identifying a high impact polystyrene plastic recycled material. The method comprises the following steps of (1) taking a sample and judging that the sample is a high impact polystyrene plastic; and (2) identifying the sample by using at least three methods of infrared spectroscopic analysis, headspace gas chromatographic analysis, electron microscope analysisand element distribution analysis; if at least three above-mentioned methods are used for identification, determining that the sample contains the high impact polystyrene plastic recycled material when the sample is determined to contain the high impact polystyrene plastic recycled material by at least three methods. The method for identifying the high impact polystyrene plastic recycled materialdisclosed by the invention is accurate in result and has universality; even when the content of the recycled material is relatively small, whether to contain the the recycled material or not can be identified by using the method disclosed by the invention.

Description

technical field [0001] The invention relates to a method for identifying recycled materials, in particular to a method for identifying recycled materials of high-impact polystyrene plastics. Background technique [0002] Since there are many types of plastics, and the appearance and properties of the finished products are very similar, it is difficult for consumers to directly distinguish what material the products are made of, which affects the rights of consumers. A few years ago, Fuzhou Customs successfully cracked a major smuggling case worth more than US$1 million in which recycled plastic pellets were used as the initial form of qualified products. The key technology in the case is to distinguish between resin raw materials and recycled materials. Due to the appearance of the samples involved in the case, the particles are uniform, the size is regular, the color is consistent, and there is basically no color difference. It is impossible to determine whether the blende...

AI Technical Summary

Problems solved by technology

However, in the identification methods given by these standards, documents and patents, there are the following deficiencies: first, it is difficult to judge new resins and recycled plastics from the differences in packaging and appearance, and the more critical problem is experienced Dopers often add better-quality recycled materials to new materials in a certain proportion, so that the original small difference between recycled materials and new materials will be reflected in the finished product after dilution; secondly, through technical index differences and The difference in environmental protection risks is to distinguish between the original shape resin and recycled plastics. After the addition and modification of additives, the recycled materials can fully achieve the technical performance of the original shape resin; third, the infrared analysis method for the verification and data analysis process of recycled materials is as follows: In the near-infrared spectrum, regardless of raw materials or recycled materials, the characteristic peak frequency values ​​are the same, but there are certain differences in the peak shape and peak intensity. However, the peak shape and peak intensity are greatly affected by the operation, so they cannot Fundamentally distinguish between raw materials and recycled materials

It can be seen that the above methods are generally relatively simple and rough, and can only be used as an auxiliary method, and cannot accurately analyze and identify recycled materials.

[0005] Currently, existing methods are imprecise in distinguishing between raw material, modified material and recycled material

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