GB/T 31984-2015Test method for determining the content of vinyl acetate in ethylene-vinyl acetate copolymer applied in photovoltaic modules - Thermal gravimetric analysis (TGA) (English PDF)
光伏组件用乙烯-醋酸乙烯共聚物中醋酸乙烯酯含量测试方法 热重分析法（TGA）
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Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
September 11, 2015
Implementation date
May 1, 2016
Scope
GB/T 31984-2015 is the English-translated version of 光伏组件用乙烯-醋酸乙烯共聚物中醋酸乙烯酯含量测试方法 热重分析法（TGA）.
GB/T 31984-2015 is the Chinese standard "Test method for determining the content of vinyl acetate in ethylene-vinyl acetate copolymer applied in photovoltaic modules - Thermal gravimetric analysis (TGA)".
Its scope clause reads: This standard specifies the determination of PV modules using thermal gravimetric analysis (TGA) with ethylene - vinyl acetate copolymer (hereinafter referred to as EVA) in vinegar The method of vinyl acetate (hereinafter referred to as VA) content, including the principle of the method, sample preparation, equipment and materials, test environment, test procedures, results Processing and reporting.
This standard is applicable for use in VA content EVA analysis of photovoltaic modules. Its clauses include principle of the method; sample preparation; instruments and materials; test environment.
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Document preview — GB/T 31984-2015
National Standard of the People's Republic of China
- ICS
- 31.030
- Classification
- L 90
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- 1 Scope
- 2 principle of the method
- 3 Sample Preparation
- 4 instruments and materials
- 5 Test Environment
1 Scope
This standard specifies the determination of PV modules using thermal gravimetric analysis (TGA) with ethylene - vinyl acetate copolymer (hereinafter referred to as EVA) in vinegar
The method of vinyl acetate (hereinafter referred to as VA) content, including the principle of the method, sample preparation, equipment and materials, test environment, test procedures, results
Processing and reporting.
This standard is applicable for use in VA content EVA analysis of photovoltaic modules.
2 principle of the method
Thermal gravimetric analysis procedure is controlled temperature, measuring the quality of the material varies with temperature relationship. Quality can be used to characterize the material with temperature
The characteristic changes, material changes due to decomposition analysis by mass, oxidation or dehydration caused. EVA occurs when more than 250 °C thermal decomposition,
The first EVA acetate groups off and the amount of decomposition of acetic acid, acetic acid is proportional to the decomposition of the VA content EVA and. This method
Take advantage of EVA thermal decomposition mass versus temperature relationship of VA content EVA measurement.
3 Sample Preparation
3.1
Sample Applications goods packaging clean and well marked, the sample containers should be placed in the drying process drying over 6h.
3.2
Sampling should wear clean gloves, clipping from a sample 5mg ~ 15mg as a sample.
4 instruments and materials
4.1
Thermal gravimetric analysis includes the following sections.
a) Balance. it is a key component of the TGA, for accurate measurement of the quality of the sample, accuracy of 0.01mg or better;
b) heating furnace. the sample is heated to the temperature of the sample and control;
c) a heat exchanger. a circulating heat function, mainly for the furnace heat exchanger;
d) gas flow controller. for control, metering purge shielding gas.
4.2
is first installed thermal gravimetric analysis should be carried out mass and temperature calibration. TGA course, should be based on frequency of use times, use
Conditions and equipment supplier's recommendations, regular mass, temperature calibration.
4.3 shielding gas purification
to sweep, clean, balance and protection of the furnace, usually using nitrogen purge gas (purity. >=99.99%).
5 Test Environment
5.1
ambient temperature (25 ± 2) °C.
5.2
relative humidity of (50 ± 5)%.
5.3
TGA console should remain stable, vibration-free, it is recommended to use marble countertops.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
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