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1、INTERNATIONAL STANDARD IS0 87804 First edition 1990-11-15 Pigments and extenders - Methods of dispersion for assessment of dispersion characteristics - Part I: Introduction Pigrnents et mati&es de charge - M6fhodes de dispersion pour haher la dispersibilik! - Partie 1: Introduction Reference number
2、IS0 8780-I :1990(E) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 10:03:41 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8780-1:1990(E) Foreword
3、 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
4、 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 el
5、ectrotechnical standardization. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an Inter- national Standard requires approval by at least 75 % of the member bodies casting a vote. International Standard IS0 8780-A was p
6、repared 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 1: introduction - Part 2: Dispersion using an oscillatory shaking mach
7、ine - 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 0 IS0 1990 All rights reserved. No part of this publlcatlon may be reproduced or utilized In any form or by an
8、y means, electronic or mechanical, Including photocopying and microfilm, without permission in writing from the publisher. international Organization for Standardization Case Postale 56 l CH-1211 Genkve 20 l Switzerland Copyright International Organization for Standardization Provided by IHS under l
9、icense with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 10:03:41 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 8780-1:1990(E) Pigments and extenders - Methods of dispersion for assessment of dispersion character
10、istics - Part 1: Introduction 1 scope This part of IS0 8780 gives an introduction to the various methods, described in subsequent parts of IS0 8780, for dispersing pigments and/or extenders ) in a particular binder system in order to assess the dispersion characteristics. Methods for assessing the c
11、haracteristics of the dispersion so produced are described in IS0 8781. The various procedures permit comparisons be- tween similar pigments (for example between a test pigment and an agreed reference pigment). The re- sults make it possible to draw inferences about the dispersion that may be obtain
12、ed under manufactur- ing conditions, but only if the dispersion conditions for the test are appropriate. 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 i
13、ndicated 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. Members of IEC and IS0 maintain registers of currently valid I
14、nternational Standards. IS0 8780-2:1990, Pigments and extenders - Methods of dispersion for assessment of dispersion charac- teristics - Part 2: Dispersion using an oscillafofy shaking machine. IS0 8780-3:1990, Pigments and extenders - Methods of dispersion for assessment of dispersion charac- feris
15、fics - Part 3: Dispersion using a high-speed impeller mill. IS0 8780-4: 1990, Pigments and extenders - Methods of dispersion for assessment of dispersion charac- teristics - Part 4: Dispersion using a bead mill. IS0 8780-5:1990, Pigments and extenders - Methods of dispersion for assessment of disper
16、sion charac- teristics - Part 5: Dispersion using an automatic mullet-. IS0 8780-6:1990, Pigments and extenders - Methods of dispersion for assessment of dispersion charac- teristics - Part 6: Dispersion using a triple-roll mill. IS0 8781-1:1990, Pigments and extenders - Methods of assessment of dis
17、persion characteristics - Part I: Assessment from fhe change in tinting strength of coloured pigments. IS0 8781-2:1990, Pigments and extenders -Methods of assessment of dispersion characferisfics - Part 2: Assessment from the change in fineness of grind. IS0 8781-3:1990, Pigments and extenders - Met
18、hods of assessment of dispersion characteristics - Part 3: Assessment irom the change in gloss. 3 Definitions For the purposes of IS0 8780 and IS0 8781, the fol- lowing definitions apply. 1) For subsequent reference in all parts of IS0 8780 and IS0 8781 the word “pigment” only is used. Copyright Int
19、ernational Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 10:03:41 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8780-1:1990(E) 3.1 mill base: Mixture of binders, solven
20、ts, pig- ments and additives. 3.2 level of dispersion: The extent to which pigment particles have been separated and stabilized by milling in a binder system under defined conditions. 3.3 dispersibility: The level of dispersion (see 3.2) when it has become constant under the defined conditions. NOTE
21、 1 The dispersibility of a pigment depends on the binder system in which it is dispersed, the method of dis- persion and the mill base composition, 3.4 ease of dispersion: A measure of the rate at which a pigment achieves a given level of dispersion during its milling in a binder system. NOTE 2 The
22、ease of dispersion may be assessed in terms of, for example, - tinting strength (see IS0 8781-l), - fineness of grind (see IS0 8781-2), - gloss (see IS0 8781-3). 3.5 aggregate: An assemblage of particles so joined together that it cannot be broken down during normal paint or ink-making processes. 3.
23、6 agglomerate: An assemblage of primary parti- cles, aggregates or a mixture of the two which may be broken down during normal paint or ink-making processes. 4 Methods of dispersion and methods of assessment 4.1 Preliminary agreements Agreement between the interested parties has to be reached on a)
24、the binder system to be used (see 4.2), b) the method or methods of dispersion (see 4.3). c) the method or methods of assessment (see 4.4), because all of these will affect the results. 4.2 Binder systems In view of the multiplicity of binder systems with widely varying properties that are encounter
25、ed in practice, it is not possible to specify in this part of IS0 8780 the binder system(s) to be used. However, depending on the method of dispersion selected, advice of a general nature is given in the other parts of IS0 8780 concerning the properties of the binder system. 4.3 Methods of dispersio
26、n Many different types of machinery and milling con- ditions are used in practice for dispersing pigments. Thus, it is not possible to specify a single method for producing a dispersion for test purposes. The other parts of IS0 8780 describe methods of dispersion of pigments under conditions that ca
27、n be related to the manufacturing method. 4.4 Methods of assessment Several methods are available for assessing the dispersion characteristics of a pigment in a binder system. These methods are described in IS0 8781. An appropriate method or methods shall be selected for a particular dispersion. 5 P
28、recision Statements on precision of the methods of assess- ment, given in the various parts of IS0 8781, are not able to be given due to the dependence of the re- sults on the choice of the binder system and the method of dispersion. _-_ _-_ UDC 667.622:541.18.052:542.22 Descriptors: paints, pigment
29、s, extenders, dispersibility, dispersing Price based on 2 pages - _- _.-.- -_c - 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 10:03:41 MDTNo reproduction or networking permitted without license from IHS -,-,-