EN ISO 8780-3:1995

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Pigmenti in polnila - Metode dispergiranja za ocenitev dispergirnih lastnosti - 3. del: Dispergiranje z mešalom z velikim številom obratov (ISO 8780-3:1990)Pigmente und Füllstoffe - Dispergierverfahren zur Beurteilung des Dispergierverhaltens - Teil 3: Dispergieren mit einem Hochgeschwindigkeitsrührer (ISO 8780-3:1990)Pigments et matieres de charge - Méthodes de dispersion pour évaluer la dispersibilité - Partie 3: Dispersion a l'aide d'une turbine disperseuse a grande vitesse (ISO 8780-3:1990)Pigments and extenders - Methods of dispersion for assessment of dispersion characteristics - Part 3: Dispersion using a high-speed impeller mill (ISO 8780-3:1990)87.060.10Pigmenti in polnilaPigments and extendersICS:Ta slovenski standard je istoveten z:EN ISO 8780-3:1995SIST EN ISO 8780-3:1997en01-december-1997SIST EN ISO 8780-3:1997SLOVENSKI
STANDARD
INTERNATIONAL STAND 87 First edition 1990-a I-15 ~- ___- --- ---- Pigments and extenders - Methods of dispersion for assessment of dispersion characteristics - Part 3: Dispersion using a high-speed impeller mill Pigments et m&i&es de charge - AMthodes de dispersion pour @valuer la dispersiDilit6 - Parfie 3: Dispersion 2 /‘aide d’une turbine disperseuse 2 qrande vitesse . . --~-_I_--__-_________ -~ ----- --.- ------- --.- _.~ -----_ Reference number- IS0 8780-3 :1990(E) SIST EN ISO 8780-3:1997

IS0 8780-3:1990(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, govern- mental 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 lnter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 8780-3 was prepared by Technical Committee ISO/TC 35, Paints and varnishes. IS0 8780 consists of the following parts, under the general title Pigments and extenders - Methods of dispersion for assessment of dispersion characteristics: - Part I: introduction - Part 2 Dispersion using an oscillatory shaking machine - Part 3: Dispersion using a high-speed impeller mill - Part 4: Dispersion using a bead mill - Part 5: Dispersion using an automatic muller - Part 6: Dispersion using a triple-roll mill Annex A forms an inteqral part of this part of IS0 8780. L 0 IS0 1990 All rights reserved. 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 Orga nization for Stand ardization Case Postale 56 l CH-121 1 Genhve 20 l Switzer Printed in Switzerland ii SIST EN ISO 8780-3:1997

Pigments and extenders - Methods of ispersion for assessment of dispersion characteristics - Part 3: Dispersion using a high--speed impeller mill 1 Scope This part of IS0 8780 specifies a method for the dis- persion of pigments and extenders using a high- speed impeller mill. It is for use in conjunction with the methods of assessment described in IS0 8781, using an agreed binder system. It should be read in conjunction with IS0 8780-I. NOTE 1 A high-speed impeller mill may be used either to disperse a pigment fully or partially as a preliminary to further dispersion using other equipment, for example sand or bead mills or attritors. This method is restricted to mill bases of moderately high viscosity due to either high binder concen- tration and/or high pigment concentration which produces high shear forces. It is not intended to provide a means of formulating full-scale mill base compositions (scaling up the process from labora- tory equipment to factory mills is not simple). 2 Normative references The following standards contain provisions which, through reference in this text. constitute provisions of this part of IS0 8780. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IS0 8780 are encouraged to investi- gate the possibility of applying the most recent edi- tions of the standards indicated below. Member-s of IEC and IS0 maintain registers of currently valid International Standards. IS0 842:1984, Raw mate/-ials for paints and varnishes - Sampling. IS0 8780-I :1990, Pigments and extenders - Methods of dispersion for assessmenf of dispersion charac- teris tics -- Part I: Irt frodrlc tion. IS0 8781-I : 1990, Pigments and extenders .-- Methods of assessment of dispersion characteris tics .--- Part I: Assessment from the change in iinfing sirength of coloured pigments. IS0 8781-2:1990, Pigments and exteuders _ Methods of assessmen f of dispersiol7 characteristics .--- Par-f 2: Assessment fr-om the cP?anqe in ikeness of L grind. . IS0 8781-3:1990, Pigments and extenders - Methods of assessment of dispersion characteristics .-- Part 3: Assessment fr-om ihe chanqe in qloss. . c 3 Required supplementary information For any particular application, the test method specified in this part of IS@ 8780 needs to be com- pleted by supplementary information. The items of supplementary information are given in annex A. 4 Apparatus Ordinary laboratory apparatus and glassware, to- gether with the following: 4.1 High-speed impeller mill, consisting of a cylin- drical vessel and a horizontal disc stirrer blade driven by a motor. A disc with a serrated edge is commonly used. 4.1.1 Drive unit. The power rating of the drive unit shall be sufficient to maintain the peripheral speed of the disc at an agreed value. SIST EN ISO 8780-3:1997

IS0 8780-3:1990(E) A reduced rotational frequency shall be available for pre-mixing in accordance with 8.2. The motor of the drive unit shall be mounted on a stand together with the impeller shaft so that its height can be adjusted. There shall be a clamping device for the vessel at the foot of the stand, such that the impeller shaft is concentric with the vessel. 4.12 Disc and vessel. The diameters of the vessel and the disc shall be such that there is adequate clearance between the disc periphery and the walls of the vessel (see be- low). If the disc is serrated, it shall be mounted so that the
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