EN ISO 4629:1998
(Main)Binders for paints and varnishes - Determination of hydroxyl value - Titrimetric method (ISO 4629:1996)
Binders for paints and varnishes - Determination of hydroxyl value - Titrimetric method (ISO 4629:1996)
Specifies a titrimetric method for determining the free hydroxyl groups in binders and binder solutions for paints and varnishes. The hydroxyl groups may be present as polyhydric alcohols, partial esters, polyester end groups or hydroxylated fatty acids. Replaces the first edition.
Bindemittel für Beschichtungsstoffe - Bestimmung der Hydroxylzahl - Titrimetrisches Verfahren (ISO 4629:1996)
Diese internationale Norm legt ein titrimetrisches Verfahren zum Bestimmen von freien Hydroxylgruppen in Bindemitteln und Bindemittellösungen für Lacke und Anstrichstoffe fest. Die Hydroxylgruppen können als mehrwertige Alkohole, partielle Ester, endständige Polyestergruppen oder hydroxylierte Fettsäuren vorliegen. Das Verfahren ist nicht für Harze geeignet, die gleichzeitig Hydroxylgruppen und Epoxidgruppen enthalten, weil letztere in das Ergebnis eingehen. Nicht geeignet ist das Verfahren auch für Cellulosenitrat und Phenolharze.
Liants pour peintures et vernis - Détermination de l'indice d'hydroxyde - Méthodes titrimétriques (ISO 4629:1996)
Veziva za barve in lake - Določanje bazičnosti - Titracijska metoda (ISO 4629:1996)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-avgust-1998
9H]LYD]DEDUYHLQODNH'RORþDQMHED]LþQRVWL7LWUDFLMVNDPHWRGD ,62
Binders for paints and varnishes - Determination of hydroxyl value - Titrimetric method
(ISO 4629:1996)
Bindemittel für Beschichtungsstoffe - Bestimmung der Hydroxylzahl - Titrimetrisches
Verfahren (ISO 4629:1996)
Liants pour peintures et vernis - Détermination de l'indice d'hydroxyde - Méthodes
titrimétriques (ISO 4629:1996)
Ta slovenski standard je istoveten z: EN ISO 4629:1998
ICS:
87.060.20 Veziva Binders
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
IS0
INTERNATIONAL
STANDARD
Second edition
1996-06-01
Binders for paints and varnishes -
Determination of hydroxyl value -
Titrimetric method
Dbtermination de l’indice d’h ydroxyle -
Liants pour peintures et vemis -
Mkthodes titrim6triques
Reference number
IS0 4629:1996(E)
IS0 4629:1996(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 rep-
resented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. IS0 col-
laborates 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 4629 was prepared by Technical Committee
lSO/TC 35, Paints and vanishes, Subcommittee SC 10, Test methods for
binders for paints and varnishes.
This second edition cancels and replaces the first edition (IS0 4629:1978),
which has been technically revised.
0 IS0 1996
All rights reserved. Unless otherwise specified, no part of this publication may be repro-
duced or utilized in any form or by any means, electronic or mechanical, including photo-
copying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-1211 Geneve 20 l Switzerland
Printed in Switzerland
IS0 4629: 1996(E)
INTERNATIONAL STANDARD @ IS0
Binders for paints and varnishes - Determination
of hydroxyl value - Titrimetric method
IS0 842: 1984, Raw materials for paints and var-
1 Scope
nishes - Sampling.
This International Standard specifies a titrimetric
IS0 3682: 1996, Binders for paints and varnishes -
method for determining the free hydroxyl groups in
Determination of acid value - Titrimetric method.
binders and binder solutions for paints and varnishes.
The hydroxyl groups may be present as polyhydric al-
IS0 3696: 1987, Water for analytical laboratory use -
cohols, partial esters, polyester end groups or hy-
Specification and test methods.
droxylated fatty acids.
This method is not applicable to resins containing both
hydroxyl groups and epoxy groups, because the latter
3 Definition
will also be included in the result. Also the method is
not applicable to cellulose nitrate or to phenolic resins.
For the purposes of this International Standard, the
NOTES
following definition applies:
1 If, in the case of binder solutions, the hydroxyl value of
3.1 hydroxyl value: The number of milligrams of
the binder only is to be determined, the possibility that
potassium hydroxide (KOH) corresponding to hydroxyl
other constituents of the binder solution may contain hy-
droxyl groups will have to be taken into account.
groups that have been acetylated under specified test
conditions in 1 g of the product tested.
2 A method for the determination of the hydroxyl value of
epoxy resins is described in IS0 7142:1984, Binders for
paints and varnishes - Epoxy resins - General methods
of test.
4 Principle
The hydroxyl groups contained in a test portion are
2 Normative references
acetylated with acetic anhydride. The excess acetic,
anhydride is hydrolysed and the resulting acetic acid is
The following standards contain provisions which,
titrated with potassium hydroxide solution, either in
through reference in this text, constitute provisions of
the presence of a colour indicator or potentiometri-
this International Standard. At the time of publication,
tally.
the editions indicated were valid. All standards are
subject to revision, and parties to agreements based
NOTE 3 Primary and secondary amines, if present, will
on this International Standard are encouraged to in-
also be acetylated. In such cases, this will have to be al-
vestigate the possibility of applying the most recent
lowed for when calculating the hydroxyl value.
editions of the standards indicated below. Members
of IEC and IS0 maintain registers of currently valid In-
ternational Standards.
5 Reagents
IS0 385-l :I 984, Laboratory glassware - Burettes -
Part 1: General requirements.
During the analysis, use only reagents of recognized
analytical grade and only water of at least grade 3 pu-
IS0 648:1977, Laboratory glassware - One-mark pip-
rity as defined in IS0 3696.
ettes.
@ IS0
IS0 4629: 1996(E)
204,22 is the rela tive molecula r mass, in grams
5.1 Potassium hydrogen phthalate
per mole, of potassium hyd rog en phthal-
[C6H&~o)$-i Kl.
ate.
5.2 Ethyl acetate, anhydrous.
5.7 Phenophthalein, 10 g/l solution in 95 % (WV)
ethanol, in methanol or in isopropanol.
5.3 Toluene/butanol mixture, 1 + 2 by volume.
5.8 Mixed-indicator solution.
5.4 Pyridine/water mixture, 3 + 1 by volume.
Mix 3 volumes of a 1 g/l ethanolic solution of thymol
blue with 1 volume of a 1 g/l ethanolic solution of cre-
5.5 Acetylating reagent.
sol red.
Dissolve 4,0 g of ptoluenesulfonic acid monohydrate
(CH&H&&H.H20) in 100 ml of ethyl acetate (5.2),
6 Apparatus
preferably using a magnetic stirrer.
To this solution, add slowly, while stirring, 33 ml of
Ordinary laboratory apparatus and glassware, together
acetic anhydride. Check that 5 ml of this reagent re-
with the following:
quires on titration a volume o
...
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