With the continuous progress of textile production technology, more and more new fibers have become raw materials for textiles. Today, I will mainly introduce you to the identification technology of recycled polyester fiber.
It is understood that in the past, due to the lack of inspection methods and the inability of testing agencies to issue qualitative reports, enterprises could not enjoy relevant national policies, and at the same time caused confusion in the labeling of some polyester products.
What is recycled polyester (PET) fiber?
That is, waste polyester (PET) polymer and waste polyester (PET) textile materials are recycled and processed into polyethylene terephthalate fiber.
In layman’s terms, recycled polyester fiber (hereinafter referred to as recycled polyester) refers to the recycled polyester (such as bottle flakes, foam, waste silk, waste pulp, waste textiles, etc.) made by recycling processes. Ester fiber.
Principle of Identification
Based on the essential difference between the processing process of recycled polyester and virgin polyester, which results in different characteristics, the sample is processed according to the specified conditions and tested on a high performance liquid chromatograph. According to the difference in the relative peak area of the sample under different retention times , To achieve the purpose of qualitative identification.
Identification step
1. Methanolysis
2. Swelling-Extraction
3. High performance liquid chromatography detection
The treatment liquids processed in the above 1 and 2 are respectively subjected to high performance liquid chromatography detection.
4. Data processing and identification
Recycled polyester will cause changes in the content and distribution of macromolecular heterogeneous chain links and oligomers during the preparation process, which can be used as a basis for the identification of recycled polyester and virgin polyester.
The specific location peak and characteristic peak information are shown in the table below.
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Look to the future
With the increase of polyester consumption and people’s awareness of environmental protection, more and more attention is paid to the recycling of polyester waste. The use of polyester waste to produce recycled polyester fiber can reduce costs, reduce oil consumption, and improve economic benefits, which is of great significance to the sustainable development of the chemical fiber industry.
At the same time, with the increase in the amount of recycled polyester, the issue of the substitution of recycled polyester and virgin polyester has attracted more and more attention from the industry. The price trend of the two also shows a certain positive correlation, and the detection of the difference between the two Technology is getting more and more attention.
Post time: Jun-18-2021