Method for identifying high impact polystyrene plastic recycled material

A polystyrene plastic, high-impact technology, used in material separation, material analysis, material analysis using radiation, etc. It is difficult to determine problems such as new resins and recycled plastics to achieve accurate and convincing results

Inactive Publication Date: 2019-06-14
KINGFA SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Method for identifying high impact polystyrene plastic recycled material
  • Method for identifying high impact polystyrene plastic recycled material
  • Method for identifying high impact polystyrene plastic recycled material

Examples

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Embodiment 1

[0034] An embodiment of the method for identifying reclaimed high-impact polystyrene plastics according to the present invention, there is an unknown sample of high-impact polystyrene plastics, and it is judged whether it contains high-impact polystyrene (HIPS) regenerated materials. Methods as below:

[0035] (1) Infrared spectrum analysis: Grind into powder and test by KBr tablet method. Grind the known raw material and the unknown sample to be tested into equal amounts of powder, mix with KBr powder, and perform infrared test after tableting. Infrared test spectrum The picture is attached figure 2 shown. If the infrared spectrum of the unknown sample has obvious miscellaneous peaks compared with the infrared spectrum of the raw material sample, the sample to be tested may contain recycled materials. Depend on figure 2It can be seen that compared with the HIPS of the raw material, the infrared spectrum of the sample to be tested has obvious miscellaneous peaks ( figur...

Embodiment 2

[0050] In this example, the identification standard of headspace gas chromatographic analysis is verified, and four high-impact polystyrene samples without recycled materials are set, which are samples No. 1 to No. 4 respectively; four high-impact polystyrene samples containing recycled materials are set. Styrene samples, samples No. 5 to No. 8, were analyzed by headspace gas chromatography: weigh 1.2g of the sample in a headspace bottle, heat the sample at 120°C for 4 hours, and then enter it into the headspace gas chromatography for analysis , then stabilized at 50°C for 3 minutes, then raised the temperature to 200°C at a rate of 12K / min, and finally stabilized at the final temperature of 200°C for 4 minutes. The data are shown in Table 4:

[0051] Table 4 Headspace gas chromatographic analysis data of samples 1 to 8

[0052]

[0053]

[0054] It can be seen from Table 4 that the peak time of No. 1-No. 4 high-impact polystyrene plastic samples without recycled materia...

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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...

Claims

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Application Information

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IPC IPC(8): G01N21/35G01N30/02G01N23/02
Inventor 宋翠翠吴博庞承焕李茂华单长国余小鸽
Owner KINGFA SCI & TECH CO LTD
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