ISO-2114-2000.pdf
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1、Reference number ISO 2114:2000(E) ISO 2000 INTERNATIONAL STANDARD ISO 2114 Third edition 2000-08-01 Plastics (polyester resins) and paints and varnishes (binders) Determination of partial acid value and total acid value Plastiques (rsines de polyesters) et peintures et vernis (liants) Dtermination d
2、e lindice dacide partiel et de lindice dacide total ISO 2114:2000(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and install
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5、ase inform the Central Secretariat at the address given below. ISO 2000 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 writin
6、g from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 ? CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO 2000 All rights reserved -,-,- ISO 211
7、4:2000(E) ISO 2000 All rights reservediii ContentsPage Foreword.iv 1Scope 1 2Normative references1 3Terms and definitions .1 4Principle2 5Reagents.2 6Apparatus.3 7Procedure.4 8Calculation and expression of results.6 9Precision.7 10Test report8 Annex A (informative) Checking the concentration of the
8、standard potassium hydroxide solution.9 -,-,- ISO 2114:2000(E) iv ISO 2000 All rights reserved 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 carri
9、ed 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. I
10、SO 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 commit
11、tees 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. IS
12、O 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 I
13、SO 3682:1996, which have been technically revised. -,-,- INTERNATIONAL STANDARDISO 2114:2000(E) ISO 2000 All rights reserved1 Plastics (polyester resins) and paints and varnishes (binders) Determination of partial acid value and total acid value 1Scope This International Standard specifies methods o
14、f 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 th
15、e terms of a specification, as well as to be used in research and development to monitor the completion of the polycondensation reaction. 2Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Stan
16、dard. 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 b
17、elow. 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 Determ
18、ination 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. 3Terms and definitions For the purposes of
19、 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-termin
20、ated 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) 2 ISO 2000 All rights reserved 4Principle 4.1Gen
21、eral 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. 4.2Method A A weighed quantity of resin is dissolved in a solvent mixture. The solution is titrated potentiometrically (see n
22、ote 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 amo
23、unts of free anhydrides are present) but is also suitable for unsaturated-polyester resins. 4.3Method 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 stand
24、ard 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 anhydride
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