EN ISO 2114:2000

SLOVENSKI STANDARD
01-september-2002
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SIST EN ISO 3682:1998
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Plastics (polyester resins) and paints and varnishes (binders) - Determination of partial
acid value and total acid value (ISO 2114:2000)
Kunststoffe (Polyester) und Beschichtungsstoffe (Bindemittel) -Bestimmung

der partiellen Säurezahl und der Gesamtsäurezahl

(ISO 2114:2000)
Plastiques (résines de polyesters) et peintures et vernis (liants) - Détermination de
l'indice d'acide partiel et de l'indice d'acide total (ISO 2114:2000)
Ta slovenski standard je istoveten z: EN ISO 2114:2000
ICS:
83.080.10 Duromeri Thermosetting materials
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 2114
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2000
ICS 83.080.10 Supersedes EN ISO 2114:1996
English version
Plastics (polyester resins) and paints and varnishes (binders) -
Determination of partial acid value and total acid value (ISO
2114:2000)
Plastiques (résines de polyesters) et peintures et vernis Kunststoffe (Polyester) und Beschichtungsstoffe
(liants) - Détermination de l'indice d'acide partiel et de (Bindemittel) - Bestimmung der partiellen Säurezahl und
l'indice d'acide total (ISO 2114:2000) der Gesamtsäurezahl (ISO 2114:2000)
This European Standard was approved by CEN on 1 August 2000.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
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© 2000 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 2114:2000 E
worldwide for CEN national Members.

Page 2
CORRECTED  2002-03-13
Foreword
This document (ISO 2114:2000) has been prepared by Technical Committee ISO/TC 61
"Plastics" in collaboration with Technical Committee CEN/TC 249 "Plastics", the secretariat of
which is held by IBN.
This European Standard shall be given the status of a national standard, either by publication of
an identical text or by endorsement, at the latest by February 2001, and conflicting national
standards shall be withdrawn at the latest by February 2001.
This document supersedes EN ISO 2114:1996.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of
the following countries are bound to implement this European Standard: Austria, Belgium, Czech
Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg,
Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of the International Standard ISO 2114:2000 has been approved by CEN as a
European Standard without any modifications.
NOTE Normative references to International Standards are listed in annex ZA (normative).

Page 3
Annex ZA
(normative)
Normative references to international publications
with their relevant European publications
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of
any of these publications apply to this European Standard only when incorporated in it by
amendment or revision. For undated references the latest edition of the publication referred to
applies (including amendments).
NOTE Where an International Publication has been modified by common modifications, indicated
by (mod.), the relevant EN/HD applies.
Publication Year Title EN Year
ISO 3251 1993 Paints and varnishes - Determination EN ISO 3251 1995
of non-volatile matter of paints,
varnishes and binders for paints and
varnishes
ISO 3696 1987 Water for analytical laboratory use - EN ISO 3696 1995
Specification and test methods

INTERNATIONAL ISO
STANDARD 2114
Third edition
2000-08-01
Plastics (polyester resins) and paints and
varnishes (binders) — Determination of
partial acid value and total acid value
Plastiques (résines de polyesters) et peintures et vernis (liants) —
Détermination de l'indice d'acide partiel et de l'indice d'acide total
Reference number
ISO 2114:2000(E)
©
ISO 2000
ISO 2114:2000(E)
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ii © ISO 2000 – All rights reserved

ISO 2114:2000(E)
Contents Page
Foreword.iv
1 Scope .1
2 Normative references .1
3 Terms and definitions .1
4 Principle.2
5 Reagents.2
6 Apparatus .3
7 Procedure .4
8 Calculation and expression of results.6
9 Precision.7
10 Test report .8
Annex A (informative) Checking the concentration of the standard potassium hydroxide solution.9
ISO 2114:2000(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
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.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 2114 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 12,
Thermosetting materials.
This third edition cancels and replaces the second edition (ISO 2114:1996) as well as ISO 3682:1996, which have
been technically revised.
iv © ISO 2000 – All rights reserved

INTERNATIONAL STANDARD ISO 2114:2000(E)
Plastics (polyester resins) and paints and varnishes (binders) —
Determination of partial acid value and total acid value
1 Scope
This International Standard specifies methods of determining the partial acid value (method A) and the total acid
value (method B) of polyester resins and binders for paints and varnishes. It is not applicable to phenolic resins.
It is intended to provide quality-control data for the acceptance or rejection of such products in accordance with the
terms of a specification, as well as to be used in research and development to monitor the completion of the
polycondensation reaction.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of
this International Standard. For dated references, subsequent amendments to, or revisions of, any of these
publications do not apply. However, parties to agreements based on this International Standard are encouraged to
investigate the possibility of applying the most recent editions of the normative documents indicated below. For
undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC
maintain registers of currently valid International Standards.
ISO 385-1:1984, Laboratory glassware — Burettes — Part 1: General requirements.
ISO 3251:1993, Paints and varnishes — Determination of non-volatile matter of paints, varnishes and binders for
paints and varnishes.
ISO 3696:1987, Water for analytical laboratory use — Specification and test methods.
ISO 6353-2:1983, Reagents for chemical analysis — Part 2: Specifications — First series.
3 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
3.1
acid value
the number of milligrams of potassium hydroxide (KOH) required to neutralize 1 g of resin under the test conditions
3.2
partial acid value
acid value corresponding to the neutralization of all the carboxyl-terminated groups and free acids plus half the free
anhydrides in a resin
3.3
total acid value
acid value corresponding to the neutralization of all the carboxyl-terminated groups and free acids plus all the free
anhydrides in a resin
ISO 2114:2000(E)
4Principle
4.1 General
The free acids/anhydrides contained in a test portion are titrated with potassium hydroxide solution, either
potentiometrically or in the presence of a colour indicator.
4.2 Method A
A weighed quantity of resin is dissolved in a solvent mixture. The solution is titrated potentiometrically (see note 1)
with a standard volumetric solution of potassium hydroxide in ethanol, giving the following reaction:
The amount, in milligrams, of potassium hydroxide used to neutralize 1 g of resin is then calculated.
Method A is recommended for binders for paints and varnishes (as generally only small amounts of free anhydrides
are present) but is also suitable for unsaturated-polyester resins.
4.3 Method B
A weighed quantity of resin is dissolved in a solvent mixture including water. The free anhydrides are allowed to
hydrolyse for 20 min before titrating potentiometrically (see note 1) with a standard volumetric solution of potassium
hydroxide in ethanol, giving the following reaction:
The amount, in milligrams, of potassium hydroxide used to neutralize 1 g of resin is then calculated.
Method B is useful for unsaturated-polyester resins in which there are significant amounts of free anhydrides.
NOTE 1 The use of a colour indicator for the titration is an optional alternative in both methods.
NOTE 2 When titrating pure maleic polyester resins, it is better to use a methanolic solution of potassium hydroxide.
5 Reagents
During the analysis, use only reagents of recognized analytical grade in accordance with ISO 6353
...