EN ISO 9702:1998

SLOVENSKI STANDARD
SIST EN ISO 9702:2000
01-maj-2000
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SULPDUQLKVHNXQGDUQLKLQWHUFLDUQLKDPLQVNLKVNXSLQDK,62
Plastics - Amine epoxide hardeners - Determination of primary, secondary and tertiary
amine group nitrogen content (ISO 9702:1996)
Kunststoffe - Aminische Epoxidhärter - Bestimmung von primären, sekundären und
tertiären Amingruppen als Stickstoffgehalt (ISO 9702:1996)
Plastiques - Durcisseurs pour résines époxy - Détermination de la teneur en azote des
groupes amine primaire, secondaire, tertiaire (ISO 9702:1996)
Ta slovenski standard je istoveten z: EN ISO 9702:1998
ICS:
83.080.10 Duromeri Thermosetting materials
SIST EN ISO 9702:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 9702:2000

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SIST EN ISO 9702:2000

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SIST EN ISO 9702:2000

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SIST EN ISO 9702:2000

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SIST EN ISO 9702:2000
ISO 9702: 1996(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation 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
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated 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 9702 was prepared by Technical Committee
ISO/TC 61, Plastics, Subcommittee SC 12, Thermosetting materials.
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 CH-1211 Geneve 20 Switzerland

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SIST EN ISO 9702:2000
IS0 9702:1996(E)
INTERNATIONAL STANDARD @ IS0
Determination
- Amine epoxide hardeners -
Plastics
of primary, secondary and tertiary amine group nitrogen
content
1 Scope
RNH2 + (CH3C0)20 -+
RNHCOCH3 + CH3COOH
This International Standard specifies a method for the
determination of the primary, secondary and tertiary
amine group nitrogen content of aliphatic or aromatic
(RR’)NH + (CH3CO)zO +
amine hardeners for epoxy resins.
(RR’)NCOCH3 + CH3COOH
2 Principle
The tertiary amine group alkalinity is determined by
potentiometric titration against hydrobromic or per-
chloric acid in glacial acetic acid/acetic anhydride, as
2.1 Aliphatic amines
described by the following reaction:
2.1.1 Determination of total amine group
(RR’R”)NH + H+ + (RR’R”)NH+
nitrogen content (XT)
The total alkalinity is determined by potentiometric
The results are expressed as percentage nitrogen,
titration against hydrobromic or perchloric acid in
as described by the following
glacial acetic acid,
reactions:
2.1.3 Determination of primary amine group
nitrogen content (XLI)
RNH2 + H+ + RNH3+
The primary amine groups are reacted with a
(RR’NH + H+ -+ (RR’)NH2+
measured excess of 2,4-pentanedione (acetylacetone)
(RR’R”)N + H+ -+ (RR’R”)NH+
in A/,/V-di-methylformamide to form imines, as
described by the following reaction:
The results are expressed as percentage nitrogen.
RNH;! + CH3COCH2COCH3 --+
NOTE 1 Perchloric acid is not suitable for use with amine
CH3CNRCH2COCH3 + Hz0
hardeners such as N-aminoethylpiperazine.
The excess acetylacetone is determined by poten-
2.1.2 Determination of tertiary amine group
tiometric titration against potassium hydroxide (the
nitrogen content (X3)
reaction products of acetylacetone and primary amine
The primary and secondary amine groups are groups are neutral under these conditions).
converted into amide groups with acetic anhydride, as
described by the following reactions: The results are expressed as percentage nitrogen.

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SIST EN ISO 9702:2000
@ IS0
IS0 9702: 1996(E)
With strongly basic amines, the secondary and tertiary
2.1.4 Determination of secondary amine group
amine group alkalinity is determined
...