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GB/T 41880-2022 English PDF (GBT41880-2022)

GB/T 41880-2022 English PDF (GBT41880-2022)

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GB/T 41880-2022: Plastics -- Epoxy resins -- Determination of electrical conductivity of aqueous resin extracts

This document describes a method for determining the electrical conductivity of the aqueous extract obtained by extracting epoxy resins with water at 95 ????C. This document is only applicable to epoxy resins that are in a molten state at extraction temperature (95 ????C). This method is of great significance to epoxy resin used as insulating material for electronic equipment. The electrical conductivity of the extract is used to evaluate the concentration of ionic substances in the resin.
GB/T 41880-2022
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 83.080.10
CCS G 32
GB/T 41880-2022 / ISO 21318:2007
Plastics - Epoxy resins - Determination of electrical
conductivity of aqueous resin extracts
(ISO 21318:2007, IDT)
ISSUED ON: OCTOBER 12, 2022
IMPLEMENTED ON: OCTOBER 12, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3
Introduction ... 4
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Reagents ... 5
5 Apparatus ... 5
6 Test procedure ... 6
7 Expression of results ... 6
8 Precision ... 7
9 Test report ... 7
Bibliography ... 8
Foreword
This document is drafted in accordance with GB/T 1.1-2020 "Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents".
This document is identical to ISO 21318:2007 "Plastics - Epoxy resins - Determination of electrical conductivity of aqueous resin extracts".
This document adds two Clauses "Normative references" and "Terms and definitions". Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing authority of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by China Petroleum and Chemical Industry Federation. This document shall be under the jurisdiction of National Technical Committee 15 on Plastic of Standardization Administration of China (SAC/TC 15).
Drafting organizations of this document: Shandong Shengquan New Materials Co., Ltd., Dalian Qihua New Material Co., Ltd., Guangzhou Huaxin Testing Technology Co., Ltd., Shanghai Qianshi Technology Co., Ltd., Nantong Xingchen Synthetic Materials Co., Ltd., Jiangsu Yangnong Kumho Chemical Co., Ltd., Dongguan National New Materials Institute Co., Ltd., Jilin Province Product Quality Supervision and Inspection Institute. Main drafters of this document: Liu Mingxiang, Guo Shuzhi, Wang Jing, Zhang Xiumei, Lu Ning, Gao Hui, Li Fu, Huang Yong, Xu Xiaohu, Chen Yuwen, Wang Dabing, Wang Meiling, Li Shangyu, Guo Yingying.
Plastics - Epoxy resins - Determination of electrical
conductivity of aqueous resin extracts
Warning: Personnel using this document should be familiar with normal
laboratory operations. This document does not purport to address all safety issues during use. Users shall develop safety and health measures and ensure compliance with regulatory requirements.
1 Scope
This document describes a method for determining the electrical conductivity of the aqueous extract obtained by extracting epoxy resins with water at 95 ??C. This document is only applicable to epoxy resins that are in a molten state at extraction temperature (95 ??C).
This method is of great significance to epoxy resin used as insulating material for electronic equipment. The electrical conductivity of the extract is used to evaluate the concentration of ionic substances in the resin.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
There are no terms and definitions to be defined in this document.
4 Reagents
Water: Use distilled water and/or deionized water with an electrical conductivity lower than 2.0 ??S/cm.
5 Apparatus
5.1 Electrical conductivity meter: Accurate to 0.1 ??S/cm. It can be immersed in the aqueous extract and has temperature compensation function.
5.2 Glass measuring cylinder: 100 mL.
5.3 Analytical balance: Accurate to 0.01 g.
5.4 Electrothermal blowing drying oven: It is capable of maintaining a temperature of 95 ??C??3 ??C.
5.5 High-density polyethylene bottle: 100 mL (with a screw cap).
5.6 Polyethylene cup: 100 mL.
6 Test procedure
6.1 Weigh 8.00 g??0.05 g of test portion into a 100 mL high-density polyethylene bottle (5.5).
6.2 Add 80 mL??2 mL of water into the bottle and cover it.
6.3 Put the bottle into the electrothermal blowing drying oven (5.4) which has been stabilized at 95 ??C.
6.4 After 30 min, slowly open the bottle cap to release the internal pressure, to prevent the bottle from bursting. Then retighten the cap.
Warning: When performing test procedure 6.4, wear protective gloves and mask. 6.5 After 20 h??0.5 h, take the bottle out of the electrothermal blowing drying oven; cool it to room temperature.
6.6 Pour water into a polyethylene cup (5.6); use an electrical conductivity meter (5.1) to measure the electrical conductivity at 25 ??C.
6.7 Without adding test portion, according to the same steps, use the same water to carry out the blank test.
7 Expression of results
Calculate the electrical conductivity ?? of the aqueous extract according to formula (1), expressed in microsiemens per centimeter (??S/cm):
Where:
??S - Indicated value of electrical conductivity of aqueous extract of test portion, in microsiemens per centimeter (??S/cm);
??B - Indicated value of electrical conductivity of blank test, in microsiemens per

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