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GB/T 37631-2019 English PDF (GBT37631-2019)

GB/T 37631-2019 English PDF (GBT37631-2019)

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GB/T 37631-2019: Man-made fiber -- Test method for thermal decomposition temperature

This Standard specifies the method that uses thermogravimetry to measure thermal decomposition temperature of chemical fiber. This Standard is applicable to chemical fiber. Chemical fiber raw materials may refer to this Standard for use.
GB/T 37631-2019
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 59.060.20
W 50
Man-made fiber - Test method for thermal
decomposition temperature
ISSUED ON: JUNE 04, 2019
IMPLEMENTED ON: JANUARY 01, 2020
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 Devices ... 4
6 Sample preparation ... 5
7 Test steps ... 6
8 Result expression ... 7
9 Precision of test results ... 9
10 Test report ... 9
Annex A (informative) Precision of test results ... 11
Bibliography ... 13
Foreword
This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard was proposed by and shall be under the jurisdiction of China Textile Industry Federation.
The drafting organizations of this Standard: Guangzhou Fiber Product Testing Institute, Shanghai Textile Industry Technical Supervision Institute, Fiber Inspection Center of Lianyungang City, Sinopec Yizheng Chemical Fiber Co., Ltd., Xiamen Xianglu Chemical Fiber Co., Ltd., Shenma industrial co., Ltd., Shanghai Textile Group Testing Standard Co., Ltd., Zhejiang Haorui New
Material Technology Co., Ltd., Tongkun Group Co., Ltd., Shenzhen Zhongke Zhongju Innovative Materials Co., Ltd., Shanghai Institute of Quality
Supervision and Inspection Technology, Changxing Shanying Chemical Fiber Co., Ltd., Textile Chemical Fiber Product Development Center.
Main drafters of this Standard: Luo Jun, Tan Weixin, He Xinyu, Zhang Jinwei, Chen Jianmei, Zhang Donggui, Zhou Zhende, Luo Wenting, Rong Zhizong, Lin Xueyan, Lin Demiao, Rong Fei, Xu Changliang, Li Deli, He Zehan, Li Xiaohui. Man-made fiber - Test method for thermal
decomposition temperature
1 Scope
This Standard specifies the method that uses thermogravimetry to measure thermal decomposition temperature of chemical fiber.
This Standard is applicable to chemical fiber. Chemical fiber raw materials may refer to this Standard for use.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 4146 (all parts), Textiles - Man-made fibers
GB/T 6425, Nomenclature for thermal analysis
3 Terms and definitions
For the purposes of this document, the terms and definitions defined in GB/T 4146 and GB/T 6425 apply.
4 Principle
Under program temperature control, measure the relationship between
specimen mass and temperature change to obtain the relationship curve
(thermogravimetric curve) between specimen mass and temperature, thus
obtain the decomposition temperature of the specimen.
5 Devices
5.1 Thermogravimetric analyzer
6.2 Sample preparation method
Use scissors to cut the sample short. The specimen length shall be less than the inner diameter of the crucible used.
6.3 Specimen mass
The specimen mass is 5mg~10mg. If the specimen density is small or there is overflow in the crucible, it may reduce the specimen mass.
7 Test steps
7.1 Clean the specimen dish.
7.2 Load the specimen dish that is cleaned but not loaded with specimen into the instrument. Set test parameters such as gas type, gas flow rate, start temperature, end temperature, and ramp rate between program temperatures. Zero the thermogravimetric analyzer.
Recommended test parameters: nitrogen atmosphere, 100mL/min purge flow
rate, 15??C/min heating rate, starting temperature is 50??C, ending temperature is 800??C.
NOTE 1: Then it is accessed to air flow, it shall cause changes in buoyancy of mass weighing system and convection in the thermogravimetric analyzer. Even if the actual mass does not change, an apparent change in mass shall be observed, and the mass measurement accuracy shall decrease. It is better to pre-run without specimen under the same heating rate and gas flow rate as the actual measurement, so as to observe the apparent change in mass.
NOTE 2: Test parameters can be changed according to actual application requirements, such as ambient atmosphere, purge flow rate, heating rate, start and end temperatures. 7.3 Place the specimen dish that is loaded with specimen into the instrument. After the gas flow rate is stable, record the specimen mass.
7.4 Start temperature program and record the thermogravimetric curve.
NOTE: It can change gas during measurement but it needs to use the same flow rate. In addition, it is better to use the gas that has similar density so as to reduce the effect of buoyancy on the results. If a gas with a similar density cannot be used, buoyancy correction is required.

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