EN ISO 2114:1996

SLOVENSKI STANDARD
SIST EN ISO 2114:2000
01-maj-2000
3ROLPHUQLPDWHULDOL1HQDVLþHQHSROLHVWUVNHVPROH'RORþDQMHGHOQHJDLQ
FHORWQHJDNLVOLQVNHJDãWHYLOD,62
Plastics - Unsaturated polyester resins - Determination of partial acid value and total acid
value (ISO 2114:1996)
Kunststoffe - Ungesättigte Polyesterharze - Verfahren zur Bestimmung der partiellen und
Gesamtsaürezahl (ISO 2114:1996)
Plastiques - Résines de polyesters non saturés - Détermination de l'indice d'acide partiel
et de l'indice d'acide total (ISO 2114:1996)
Ta slovenski standard je istoveten z: EN ISO 2114:1996
ICS:
83.080.10 Duromeri Thermosetting materials
SIST EN ISO 2114:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 2114:2000

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SIST EN ISO 2114:2000

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SIST EN ISO 2114:2000

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SIST EN ISO 2114:2000
INTERNATIONAL IS0
STANDARD 2114
Second edition
1996-12-15
Plastics - Unsaturated polyester resins -
Determination of partial acid value and total
acid value
P/as tiques - Rksines de polyesters non sat&s - Dbtermination de
I’indice d ’acide partiel et de I’indice d ’acide total
Reference number
IS0 2114:1996(E)

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SIST EN ISO 2114:2000
IS0 2114:1996(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide fed-
eration of national standards bodies (IS0 member bodies). The work of
preparing International Standards is normally carried out through IS0
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. IS0 collabor-
ates closely with the International Electrotechnical Commission (IEC) on all
matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are cir-
culated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard IS0 2114 was prepared by Technical Committee
ISO/TC 61, Plastics, Subcommittee SC 12, Thermosetting materiak
This second edition cancels and replaces the first edition (IS0 2114:1974),
which has been technically revised (see the introduction for details).
0 IS0 1996
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 l CH-1211 Geneve 20 l Switzerland
Internet
central @ isocs.iso.ch
x.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
ii

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SIST EN ISO 2114:2000
IS0 2114:1996(E)
@ IS0
Introduction
This International Standard was developed for unsaturated polyester resins
and specifies the methods that are applicable for the determination of the
acid values: total acid value and partial acid value.
The previous edition determined only the partial acid value, which corre-
sponds to the neutralization of only half of the free anhydride present. In
the case of resins based on maleic anhydrideketrahydrophthalic acid, the
error involved is very small. In the case of resins based on maleic anhy-
dride/orthophthalic acid or maleic anhydrideketrabromophthalic acid, how-
ever, the error is significant.
Hence, this edition includes methods for the dete rmina tion of both partial
s, using the chemical reactions given below:
and total acid value
0
4
0 0
C
/\ II II
R O+KOH+C2H50H -C2HsOCRCOK+H20
Method A
\/
c
+
0
00
c
II II
/\
R O+ZKOH -KOCRCOK+H20
Method B

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SIST EN ISO 2114:2000
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SIST EN ISO 2114:2000
INTERNATIONAL STANDARD @ IS0 IS0 2114:1996(E)
Plastics - Unsaturated polyester resins - Determination of partial
acid value and total acid value
3.1 acid value: The number of milligrams of pot-
1 Scope
assium hydroxide (KOH) required to neutralize 1 g of
unsaturated polyester resin under the test conditions.
This International Standard specifies methods of de-
termining the partial acid value (method A) and the
3.2 partial acid value: The acid value correspond-
total acid value (method B) of unsaturated polyester
ing to the neutralization of all the carboxyl-terminated
resins.
groups and free acids plus half the anhydride groups
in an unsaturated polyester resin.
It is intended to provide quality-control data for the ac-
ceptance or rejection of resins in accordance with the
3.3 total acid value: The acid value corresponding
terms of a specification, as well as to be used in re-
to the neutralization of all the carboxyl-terminated
search and development to monitor the completion of
groups and free acids plus all the anhydride groups in
the polycondensation reaction.
an unsaturated polyester resin.
4 Principle
2 Normative references
4.1 Method A
The following standards contain provisions which,
A weighed quantity of resin is dissolved in a solvent
through reference in this text, constitute provisions of
mixture and the resin solution is titrated potentiometri-
this International Standard. At the time of publication,
tally (see note 1) with a standard volumetric solution
the editions indicated were valid. All standards are
of potassium hydroxide in ethanol. The partial acid
subject to revision, and parties to agreements based
value is the number of milligrams of potassium hydrox-
on this International Standard are encouraged to in-
ide required to neutralize 1 g of resin.
vestigate the possibility of applying the most recent
editions of the standards indicated below. Members of
IEC and IS0 maintain registers of currently valid Inter-
4.2 Method B
national Standards.
A weighed quantity of resin is dissolved in a solvent
mixture including water. The free anhydride groups
IS0 3696:1987, Water for analytical laboratory use -
Specification and test methods. are allowed to hydrolyse for 20 min before titrating
potentiometrically (see note 1) with a standard volu-
metric solution of potassium hydroxide in ethanol. The
IS0 6353-2:1983, Reagents for chemical analysis -
total acid value is the number of milligrams of pot-
Part 2: Specifications - First series.
assium hydroxide required to neutralize 1 g of resin.
NOTES
1 Titration using a colour indicator is an optional alterna-
3 Definitions
tive in both methods.
2 When titrating pure maleic polyester resins, it is better to
For the purposes of this International Standard, the use a standard volumetric solution of potassium hydroxide
following definitions apply: in methanol.
1

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SIST EN ISO 2114:2000
@ IS0
IS0 2114:1996(E)
6.5 Automatic pipettes, of capacity 25 ml, 50 ml
5 Reagents
and 60 ml.
During the analysis, use only reagents of
...