GB/T 39026-2020 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 39026-2020 | English | 125 |
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Test method for the identification of recycled polyethylene terephthalate(PET) fiber
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GB/T 39026-2020: Test method for the identification of recycled polyethylene terephthalate(PET) fiber
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT39026-2020
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 59.060.20
W 50
Test Method for the Identification of Recycled
Polyethylene Terephthalate (PET) Fiber
Issued on. JULY 21, 2020
Implemented on. FEBRUARY 1, 2021
Issued by. State Administration for Market Regulation;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative References... 4
3 Terms and Definitions... 4
4 Principle... 4
5 Instruments, Equipment, Reagents and Materials... 5
6 Test Procedures... 6
7 Test Report... 14
Foreword
This Standard was drafted in accordance with the rules in GB/T 1.1-2009.
This Standard was proposed by and shall be under the jurisdiction of China National
Textile and Apparel Council.
The drafting organizations of this Standard. Shanghai Textile Industry Institute of
Technical Supervision; Shanghai Textile Research Institute; Shanghai Textile Group
Testing Standard Co., Ltd.; SINOPEC Shanghai Research Institute of Petrochemical
Technology; SINOPEC Yizheng Chemical Fiber Co., Ltd.; Jiaxing Fulin Chemical Fiber
Co., Ltd.; Tongkun Group; Zhejiang Haili Environmental Technology Co., Ltd.; Yuyao
Dafa Chemical Fiber Co., Ltd.; Fujian Cyclone Technology Co., Ltd.; Fujian Baichuan
Resources Recycling Science & Technology Co., Ltd.; Far Eastern Industries
(Shanghai) Ltd.; Anhui Dong Jin Renewable Resources Technology Co., Ltd.;
Hangzhou Benma Chemical Fiber Spinning Co., Ltd.; Hangzhou Huachuang Industrial
Co., Ltd.; Elite Color Environmental Resources Science & Technology Co., Ltd.;
Guangdong Qiu Sheng Resources Co., Ltd.; Jiangsu Hengke New Material Co., Ltd.;
Henan Shunxiang Chemical Fiber Co., Ltd.; Wuxi Jintong High Fiber Co., Ltd.; Poly
Plastic Masterbatch (Suzhou) Co., Ltd.; Zhejiang Jiaren New Materials Co., Ltd.;
Hangzhou Huacheng Polymer Fiber Co., Ltd.; Jiangsu Guowang High-tech Fiber Co.,
Ltd.; Xiamen Xianglu Chemical Fiber Company Limited; Yizheng Zhongxing
Environmental Protection Technology Co., Ltd.; Hangzhou Taifor Chemical Fiber Co.,
Ltd.; Hebei Jinyi Polyester Fiber Co., Ltd.; Yangzhou TinFuLong Automotive Interior
Trim Fiber Co., Ltd.; Fujian Lizhi New Material Co., Ltd.; China Chemical Fibers
Association; Liaoning Jihua New Material Manufacturing Co., Ltd; Zhangjiagang
Huayun New Material Co., Ltd.
The main drafters of this Standard. Fu Changfei, Li Hongjie, Xu Yiqun, Liu Yanjun,
Chen Jianmei, Chen Jianxiang, Peng Guoping, Chen Hao, Qian Jun, Fang Huayu, Xie
Lifeng, Ren Zhongsheng, Xing Chaodong, Zhou Liying, Chen Baofang, Xu Hao, Ma
Junbin, Yu Tao, Zhang Gang, Qian Qiyuan, Xu Yiming, Li Zhuping, Wang Senjun, Luo
Xiaojun, Liu Longmin, Zhou Tianyi, Zhou Yingchun, Wang Zhijun, Zhou Guoxiang, Li
Tianyuan, Li Deli, Lu Min, Zhou Ping.
Test Method for the Identification of Recycled
Polyethylene Terephthalate (PET) Fiber
1 Scope
This Standard specifies the test method for the identification of recycled polyethylene
terephthalate (PET) fiber (hereinafter referred to as recycled polyester).
This Standard is applicable to natural and colored recycled polyester. Other functional
recycled polyester may take this as a reference.
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specified date, only versions with a specified date are
applicable to this document. In terms of references without a specified date, the latest
version (including all the modifications) is applicable to this document.
GB/T 4146 (all parts) Textiles - Man-made Fibers
GB/T 6682 Water for Analytical Laboratory Use - Specification and Test Methods
3 Terms and Definitions
What is defined in GB/T 4146, and the following terms and definitions are applicable
to this document.
4 Principle
Based on the essential difference between the processing process of recycled
polyester and primary polyester, which causes certain characteristics to be different,
process the specimen in accordance with the specified conditions, then, test it on a
high performance liquid chromatograph.
5 Instruments, Equipment, Reagents and Materials
5.1 Instruments and Equipment
5.1.1 High performance liquid chromatograph, equipped with diode array detector
(DAD) and column temperature control device.
5.1.2 Analytical balance. with an accuracy of 0.1 mg.
5.1.5 Bench vice or other fixing device.
5.1.6 Automatic pipetting device or pipette. 1 mL, 20 mL and 25 mL.
5.1.7 Measuring cylinder. 50 mL and 200 mL.
5.1.8 Volumetric flask. 2 L.
5.1.9 2 mL threaded sample bottle that can be used for automatic sample injection of
the high performance liquid chromatograph, with PTFE liner.
5.1.10 Syringe-driven filter, filter membrane 0.45 μm; made of PTFE.
5.1.11 Reagent reservoir, with a stopper; made of glass.
5.2 Reagents and Materials
5.2.1 Methanol, analytically pure.
5.2.2 Methanol, chromatographically pure.
5.2.3 Catalyst. zinc acetate, analytically pure.
5.2.4 Transesterification solution. weigh-take 60 mg of zinc acetate; use methanol to
dissolve it and dilute to 2 L.
6 Test Procedures
6.1 Methanolysis
6.1.1 Weigh-take 0.8 g (accurate to 0.1 mg) of the specimen to be tested.
6.1.2 Place the specimen into the reaction tube; accurately add 25 mL of the
transesterification solution. Use the bench vice to tighten the cap of the reaction tube
(to ensure air tightness); vertically put it into the heating device.
6.2 Swelling-extraction
6.2.1 Weigh-take about 5 g of the same specimen to be tested; place it in a drying oven
that is previously heated to 105 °C to dry for 30 min. Then, take it out and put it in a
desiccator to cool it down; reserve it for later use.
6.2.2 Use a measuring cylinder to respectively weigh-take 160 mL of sulfolane and 40
mL of acetonitrile. Put them into the reagent reservoir, put on the cap; shake it well and
reserve it for later use.
6.2.4 Pour the sample into a centrifuge tube, then, at a centrifugal speed of 4,000 r/min,
centrifuge for 8 min. Take the supernatant; filter it through the syringe-driven filter to a
2 mL sample bottle.
6.3 High Performance Liquid Chromatography Detection
Respectively conduct high performance liquid chromatography detection on the
treatment liquids treated in accordance with 6.1 and 6.2.After the chromatographic
detection is completed, derive the original signal data of high performance liquid
chromatography.
6.4 Data Processing and Identification
6.4.1 In terms of the signal obtained after the alcoholysis treatment through the high
performance liquid chromatography detection, respectively define the two strong
peaks with retention time 12.11 min ~ 12.55 min and 15.50 min ~ 16.10 min as
positioning peak “peak1” and positioning peak “peak2”, as it is shown in Figure 2;
6.4.3 The detailed information of the positioning peak and the characteristic peak is
shown in Table 2.
Table 2 -- Information of Positioning Peak and Characteristic Peak
6.4.4 Establish a discriminant function Wi for the relative content of fingerprint peaks
“peak3”, “peak4”, “peak6” and “peak7”. The discriminant function is related to the
dispersion of the data and is the quadratic function of Xi, as it is shown in Formula (5).
7 Test Report
The test report shall include the following contents.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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