Plastics -- Epoxy resins -- Determination of 1,2-glycol content

ISO 21048:2014 specifies a method for the determination of the 1,2-glycol content in epoxy resins.

Plastiques -- Résines époxydes -- Détermination de la teneur en 1,2-glycol

General Information

Status
Published
Publication Date
10-Feb-2014
Current Stage
6060 - International Standard published
Start Date
29-Jan-2014
Completion Date
11-Feb-2014
Ref Project

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ISO 21048:2014 - Plastics -- Epoxy resins -- Determination of 1,2-glycol content
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INTERNATIONAL ISO
STANDARD 21048
Second edition
2014-02-15
Plastics — Epoxy resins —
Determination of 1,2-glycol content
Plastiques — Résines époxydes — Détermination de la teneur en
1,2-glycol
Reference number
ISO 21048:2014(E)
ISO 2014
---------------------- Page: 1 ----------------------
ISO 21048:2014(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2014

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form

or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior

written permission. Permission can be requested from either ISO at the address below or ISO’s member body in the country of

the requester.
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Published in Switzerland
ii © ISO 2014 – All rights reserved
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ISO 21048:2014(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Principle ........................................................................................................................................................................................................................ 1

5 Reagents ........................................................................................................................................................................................................................ 2

6 Apparatus ..................................................................................................................................................................................................................... 4

7 Procedure..................................................................................................................................................................................................................... 4

8 Expression of results ........................................................................................................................................................................................ 5

9 Precision ....................................................................................................................................................................................................................... 5

10 Test report ................................................................................................................................................................................................................... 6

© ISO 2014 – All rights reserved iii
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ISO 21048:2014(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of any

patent rights identified during the development of the document will be in the Introduction and/or on

the ISO list of patent declarations received (see www.iso.org/patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical Barriers

to Trade (TBT) see the following URL: Foreword - Supplementary information.

The committee responsible for this document is ISO/TC 61, Plastics, Subcommittee SC 12, Thermosetting

materials.

This second edition cancels and replaces the first edition (ISO 21048:2004), which has been technically

revised.
iv © ISO 2014 – All rights reserved
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ISO 21048:2014(E)
Introduction

In producing epoxy resin based on epichlorohydrin, impurities containing 1,2-glycol may be formed.

Owing to the hydrophilic characteristics of 1,2-glycol, it is necessary to control the level of these

impurities, since they could affect final properties such as electrical insulation. Additionally, these

impurities could affect the speed of the curing reaction when using curing agents such as amines and

acid anhydrides. Therefore, it is important to determine the 1,2-glycol content in epoxy resins for both

resin manufacture and customer use.
© ISO 2014 – All rights reserved v
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INTERNATIONAL STANDARD ISO 21048:2014(E)
Plastics — Epoxy resins — Determination of 1,2-glycol
content

SAFETY STATEMENT — Persons using this document should be familiar with normal laboratory

practice, if applicable. This document does not purport to address all of the safety concerns, if

any, associated with its use. It is the responsibility of the user to establish appropriate safety and

health practices and to ensure compliance with any regulatory requirements.
1 Scope

This International Standard specifies a method for the determination of the 1,2-glycol content in epoxy

resins.
2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 3696, Water for analytical laboratory use — Specification and test methods

ISO 5725-2, Accuracy (trueness and precision) of measurement methods and results — Part 2: Basic method

for the determination of repeatability and reproducibility of a standard measurement method

3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
1,2-glycol

the 1,2-glycol group [-CH(OH)CH OH] in epoxy resins, the content of which is expressed in moles per

kilogram of the epoxy resin
Note 1 to entry: This moiety is chemically equivalent to two OH groups.

Note 2 to entry: Other possible nomenclatures are vicinal-OH group, 1,2-dihydroxyl group, α-glycol group.

4 Principle
1,2-glycol is determined on the basis of the following reactions.

1,2-glycol is oxidized to aldehyde compounds by an excess of orthoperiodic acid (reaction 1), then

potassium iodide is added to the reaction mixture in the presence of sulfuric acid (reaction 2). The

generated iodine is then titrated by standardized sodium thiosulfate solution (reaction 3). The 1,2-glycol

...

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