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The national standard GB/T 39026-2020 "Method for Identification of Recycled Polyester (PET) Fibers" implemented on February 1, 2021 fills in the domestic and foreign gaps in this field, and provides technical support and guarantee for the country to formulate relevant policies
.
? 1.
Recycled polyester (PET) overview? 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 recycling process of waste polyester (such as bottle flakes, foam, waste silk, waste pulp, waste textiles, etc.
) Polyester fiber
.
2.
Identification principle? Based on the essential difference between the processing process of regenerated polyester and virgin polyester, which causes some characteristics to be different, the sample is processed according to the specified conditions and tested on a high performance liquid chromatograph.
According to the different retention time of the sample The difference in relative peak area can achieve the purpose of qualitative identification
.
Three, identification steps? 1.
Methanolysis? "? 2.
Swelling-extraction? "? 3.
High performance liquid chromatography detection? The processing solution processed in 1 and 2 above will be tested by high performance liquid chromatography
.
? "? 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 the basis for the identification of recycled polyester and virgin polyester
.
?" "" " ? The specific positioning peak and characteristic peak information are shown in the following table
.
? "? Four.
Looking to the future? With the increase of polyester consumption and the enhancement of 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
.
.
? 1.
Recycled polyester (PET) overview? 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 recycling process of waste polyester (such as bottle flakes, foam, waste silk, waste pulp, waste textiles, etc.
) Polyester fiber
.
2.
Identification principle? Based on the essential difference between the processing process of regenerated polyester and virgin polyester, which causes some characteristics to be different, the sample is processed according to the specified conditions and tested on a high performance liquid chromatograph.
According to the different retention time of the sample The difference in relative peak area can achieve the purpose of qualitative identification
.
Three, identification steps? 1.
Methanolysis? "? 2.
Swelling-extraction? "? 3.
High performance liquid chromatography detection? The processing solution processed in 1 and 2 above will be tested by high performance liquid chromatography
.
? "? 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 the basis for the identification of recycled polyester and virgin polyester
.
?" "" " ? The specific positioning peak and characteristic peak information are shown in the following table
.
? "? Four.
Looking to the future? With the increase of polyester consumption and the enhancement of 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
.