GB/T 46286-2025Geosynthetics — Determination of oxidative induction time — High-pressure differential scanning calorimetry method (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents". Drafting.

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed by the China National Light Industry Council.

This document is under the jurisdiction of the National Technical Committee on Standardization of Plastic Products (SAC/TC48).

This document was drafted by: Sinopec (Beijing) Chemical Research Institute Co., Ltd., Mocon Materials Technology (Changshu) Co., Ltd., and Soma Geotechnical Engineering Co., Ltd.

Chengcai Materials (Suzhou) Co., Ltd., Huadun Snowflake Plastics (Gu'an) Co., Ltd., Jiangsu Jinba Environmental Technology Co., Ltd., Yizheng Sheng Lifang Drainage Materials Co., Ltd., Shanghai Yingfan Engineering Materials Co., Ltd., Taian Jialutong Engineering Materials Co., Ltd., Qingdao Xuyu Geotechnical Materials Co., Ltd.

Materials Co., Ltd., Zhejiang Tianpeng New Materials Co., Ltd., Shandong Lude New Materials Co., Ltd., and Nanchang Tiangao Environmental Protection Technology Co., Ltd.

Limited Liability Company, Yunnan Zhanpeng Geotechnical Materials Manufacturing Co., Ltd., Shandong Jiantong Plastics Technology Co., Ltd., Yunnan Zhongchi Engineering Materials Co., Ltd.

Guangdong Jinsui Environmental Protection Technology Co., Ltd., Shandong Tianhai New Material Engineering Co., Ltd., Shandong Jingchuang New Material Technology Co., Ltd., and Hongcheng Synthetic Materials (Jiangsu) Co., Ltd., Shandong Jinchi Huayi Engineering Materials Co., Ltd., Liaoning Dayu Waterproof Engineering Co., Ltd., Hongxiang New Materials Co., Ltd.

Limited Liability Company, Huiguang Co., Ltd., Shandong Baifeng Plastics Co., Ltd., Shandong Chenghao New Materials Co., Ltd., Shandong Longtuo New Materials Co., Ltd.

The company, Shandong Zhongyi Rubber & Plastics Co., Ltd., and Changsha Jianyi New Materials Co., Ltd.

The main drafters of this document are: Wu Peng, Li Wangcheng, Liu Zhangshuo, Zhou Zijiong, Liu Bingwei, Yang Huahao, Chen Ximing, Zhao Baoping, He Yong, and Zhang Baoli.

Yuan Shaopeng, Gao Fu, Liang Xunmei, Deng Shaoping, Lü Jiansong, Dong Wenxi, Peng Fuying, Xu Wenhan, Xiao Huachun, Feng Zhongchao, Zhang Yuda, Zhou Kun, Zhang Dongxu Liu Haowu, Chen Guanhua, Xie Hao, Wang Shujun, Zheng Yucheng, Pang Yuxi, Li Wenyi, Wang Jianyi, Zhuang Yafang, Ding Jinhai.

Determination of oxidation induction time of geosynthetics High-pressure differential scanning calorimetry

1 Scope

This document describes a test method for determining the oxidation induction time of geosynthetics using high-pressure differential scanning calorimetry, and specifies the instrumentation requirements.

Materials, sample preparation, test procedures, results and calculations, etc.

This document applies to the determination of oxidation induction time of geosynthetic materials such as polyolefin geomembranes, geocells, geogrids, and geonets.

2 Normative references

GB/T 9352

GB/T 19466.1

GB/T 19466.6

3 Terms and Definitions

The terms and definitions defined in GB/T 19466.1 and GB/T 19466.6, as well as the following terms and definitions, apply to this document.

4 Principles

The sample and reference sample were heated from room temperature to a specified temperature at a constant rate in a high-pressure oxygen atmosphere and held at that temperature until...

The thermal analysis curve shows an exothermic oxidation reaction. The oxidation induction time is the time interval from the start of heating to the onset of the oxidation reaction.

The starting point is determined by the sudden increase in heat release from the sample and can be measured using a high-pressure differential scanning calorimeter.

5 Instruments and Materials

Warning. High-pressure gases should be used safely and properly. Oxygen is a very strong oxidizing agent and can accelerate combustion; keep away from greases and oils during use.

5.1 The high-pressure differential scanning calorimeter shall meet the following main performance requirements.

a) The temperature is increased at a constant rate of (20±1)°C/min, and the heat flow difference between the sample and the reference sample can be output in real time;

b) The temperature signal resolution is within 0.1°C, and the test temperature can be kept constant within ±0.5°C;