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Method for identifying polypropylene recycled material

A technology of polypropylene and recycled materials, which is applied in the direction of material separation, material analysis, and material inspection products, etc. It can solve the problems of inability to fundamentally distinguish between raw materials and recycled materials, inaccurate analysis and identification of recycled materials, simplicity and roughness, etc.

Inactive Publication Date: 2019-06-11
KINGFA SCI & TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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  • Method for identifying polypropylene recycled material
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  • Method for identifying polypropylene recycled material

Examples

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Embodiment 1

[0039] An embodiment of the polypropylene recycled material identification method of the present invention, there is an unknown polypropylene sample, and it is judged whether it contains polypropylene recycled material, the analysis method is as follows:

[0040] (1) Solubility analysis: use toluene solution, place the sample in toluene solvent at 130°C, heat for 4 hours, the sample cannot be completely dissolved and becomes turbid (see attached figure 2 Shown), it is judged that the sample contains polypropylene recycled materials.

[0041] (2) Infrared spectrum analysis: Take 5ul of the solution after dissolving the polypropylene sample and drop it on the KBr tablet, bake it in an oven at 70°C for 0.5h, and test the infrared spectrum, as shown in the attached image 3 As shown, compared with the standard polypropylene raw material spectrum, the infrared spectrum of the sample to be tested has obvious miscellaneous peaks, but the main characteristic peaks are consistent, con...

Embodiment 2

[0049] An embodiment of the polypropylene recycled material identification method of the present invention, there is an unknown polypropylene sample, and it is judged whether it contains polypropylene recycled material, the analysis method is as follows:

[0050] (1) Solubility analysis: put the sample in chloroform solvent, use an extraction device, heat to 70°C, and the heating time is 1h, the solution is turbid (see attached Figure 5 Shown), it is judged that the sample to be tested contains recycled polypropylene material.

[0051] (2) Infrared spectrum analysis: Take 5ul of the solution after dissolving the polypropylene sample and drop it on the KBr tablet, bake it in an oven at 70°C for 0.5h, and test the infrared spectrum, as shown in the attached Figure 6 As shown, compared with the standard polypropylene raw material spectrum, there are obvious miscellaneous peaks, but the main characteristic peaks are consistent, confirming that this is a polypropylene sample cont...

Embodiment 3

[0058] In this example, the identification standard of headspace gas chromatographic analysis is verified, and 5 polypropylene samples without recycled materials are set, which are samples No. 1 to 5 respectively; and 5 samples containing recycled materials are set, which are respectively No. Samples 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, then enter the headspace gas chromatography for analysis, then stabilize it at 50°C for 3min, and then use The temperature was raised 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 3:

[0059] Table 3 Headspace gas chromatographic analysis data of samples 1 to 10

[0060]

[0061]

[0062] It can be seen from Table 3 that the peak time of No. 1-No. 5 polypropylene samples that do not contain recycled materials is all before 14 minutes, and the number of peaks is...

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Abstract

The invention discloses a method for identifying a polypropylene recycled material. The method includes the following steps: (1) a sample is taken, and it is determined that the sample is polypropylene; and (2) the sample is identified through at least three of a solubility analysis method, an infrared spectroscopic analysis method, a headspace gas chromatography analysis method, an electron microscope analysis method and an element distribution analysis method, if it is determined that the sample contains the polypropylene recycled material through at least three of the methods when at leastthree of the methods are adopted for identification, it is determined that the sample contains the polypropylene recycled material. According to the method for identifying the polypropylene recycled material, a result is accurate, and the method has universality; and even if when the content of the recycled material is small, the method can also be applied to identify whether the sample contains the recycled material or not.

Description

technical field [0001] The invention relates to a method for identifying recycled materials, in particular to a method for identifying recycled materials for polypropylene. 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 blended resin is a recyc...

Claims

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Application Information

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IPC IPC(8): G01N33/44G01N21/73G01N23/00G01N30/02
Inventor 吴博宋翠翠庞承焕李茂华曹树坤单长国田报黄克凡
Owner KINGFA SCI & TECH CO LTD
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