GB/T 41926-2022 English PDF

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GB/T 41926-2022: Plastics - Epoxy resins - Determination of 1, 2-glycol content
Status: Valid

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Basic data

Standard ID: GB/T 41926-2022 (GB/T41926-2022)
Description (Translated English): Plastics - Epoxy resins - Determination of 1, 2-glycol content
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G32
Classification of International Standard: 83.080.01
Word Count Estimation: 10,153
Date of Issue: 2022-12-30
Date of Implementation: 2023-04-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 41926-2022: Plastics - Epoxy resins - Determination of 1, 2-glycol content

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 83.080.01 CCSG32 National Standards of People's Republic of China Determination of 1,2-Ethylene Glycol Content in Plastic Epoxy Resins (ISO 21048.2014, IDT) Posted on 2022-12-30 2023-04-01 Implementation State Administration for Market Regulation Released by the National Standardization Management Committee

foreword

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for Standardization Work Part 1.Structure and Drafting Rules for Standardization Documents" drafting. This document is equivalent to ISO 21048.2014 "Determination of 1,2-Ethylene Glycol Content in Plastic Epoxy Resins". The following minimal editorial changes have been made to this document. ---Added notes in 5.4, 5.5, 5.9, 5.10, 5.12.2; --- Amend "V2-V1" in formula (1) of 5.12.3 to "V1-V2"; Please note that some contents of this document may refer to patents. The issuing agency of this document assumes no responsibility for identifying patents. This document is proposed by China Petroleum and Chemical Industry Federation. This document is under the jurisdiction of the National Plastics Standardization Technical Committee (SAC/TC15). This document is drafted by. Shandong Shengquan New Materials Co., Ltd., Nantong Xingchen Synthetic Materials Co., Ltd., Guangzhou Huaxin Testing Technology Co., Ltd., Shanghai Qianshi Technology Co., Ltd., Dalian Qihua New Material Co., Ltd., Jiangsu Yangnong Kumho Chemical Co., Ltd., Dongguan Hongguo Leather Co., Ltd., CGN Juner (Zhejiang) New Material Co., Ltd., Jilin Provincial Product Quality Supervision and Inspection Institute, Shenzhen Beststar Excellence Branch Technology Co., Ltd. The main drafters of this document. Liu Mingxiang, Yang Xiaoyan, Zhang Zeru, Gao Hui, Lu Ning, Zhang Xiumei, Ji Kejun, Guo Shuzhi, Xu Xiaohu, Li Fu, Wang Dabing, Fang Bingshun, Tian Jibo, Li Shangyu, Sun Xiaozhong, Wei Dongjin.

Introduction

During the production of epichlorohydrin epoxy resin, impurities containing 1,2-ethylene glycol can be formed. Due to the hydrophilicity of 1,2-ethylene glycol However, the content of these impurities needs to be controlled because they can affect the final properties, such as electrical insulation. In addition, when using curing agents such as amines and anhydrides These impurities will affect the speed of the curing reaction. Therefore, for resin manufacturing and customer use, the determination of 1,2-ethane in epoxy resin The diol content is very important. Determination of 1,2-Ethylene Glycol Content in Plastic Epoxy Resins CAUTION. Personnel using this document should be familiar with routine laboratory practice. This document does not mention all safety issues during use, so that The user must establish appropriate safety and health measures and ensure compliance with regulatory requirements.

1 Scope

This document describes a method for the determination of the 1,2-ethanediol content of epoxy resins. This document applies to the determination of 1,2-ethylene glycol content in epoxy resin.

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text. Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document. and testmethods) Note. GB/T 6682-2008 Analytical Laboratory Water Specifications and Test Methods (ISO 3696.1987, MOD) ISO 5725-2 Accuracy (trueness and precision) of measurement methods and results - Part 2.Determining the repeatability of standard measurement methods mentmethod] Note. GB/T 6379.2-2004 Accuracy of measurement methods and results (trueness and precision) Part 2.Determining the repeatability and repeatability of standard measurement methods The basic method of presentability (ISO 5725-2.1994, IDT)

3 Terms and Definitions

The following terms and definitions apply to this document. 3.1 1,2-ethylene glycol1,2-glycol The content of 1,2-ethylene glycol [-CH(OH)CH2OH] groups in epoxy resins is expressed in moles per kilogram (mol/kg). Note 1.This part is equivalent to two -OH groups in chemical structure. Note 2.Other possible naming methods are ortho-OH group, 1,2-dihydroxyl group, α-ethylene glycol group.

4 principles

1,2-Ethylene glycol is determined according to the following reaction. 1,2-Ethylene glycol is oxidized to aldehyde compound by excess periodic acid (reaction formula 1), then add potassium iodide and sulfuric acid to react (reaction formula 2), the generated iodine is titrated with sodium thiosulfate standard solution (reaction formula 3). The content of 1,2-ethylene glycol was determined by the standard titration solution of sodium thiosulfate Consumption calculation. ......

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