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1、BRITISH STANDARD BS EN ISO 8781-1:1995 Incorporating Amendment No. 1 Pigments and extenders Methods of assessment of dispersion characteristics Part 1: Assessment from the change in tinting strength of coloured pigments The European Standard EN ISO 8781-1:1995 has the status of a British Standard Li
2、censed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8781-1:1995 This British Standard, having been prepared under the direction of the Pigments, Paints and Varnishes Standards Policy Committee, was published under the authority of the St
3、andards Board and comes into effect on 30 April 1991 BSI 04-2000 The following BSI references relate to the work on this standard: Committee reference PVC/1 Draft for comment 86/52358 DC ISBN 0 580 19540 6 Committees responsible for this British Standard The preparation of this British Standard was
4、entrusted by the Pigments, Paints and Varnishes Standards Policy Committee (PVC/-) to Technical Committee PVC/1, upon which the following bodies were represented: Aluminium Powder and Paste Association British Cement Association British Railways Board Chemical Industries Association Oil and Colour C
5、hemists Association Paintmakers Association of Great Britain Ltd Titanium Pigment Manufacturers Technical Committee Zinc Development Association Amendments issued since publication Amd. No.DateComments 8525August 1995 Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na,
6、Mon Nov 20 02:57:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8781-1:1995 BSI 04-2000i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN ISO 8781-13 Publication(s) referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon No
7、v 20 02:57:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8781-1:1995 ii BSI 04-2000 National foreword This Part of BS 3483 has been prepared under the direction of the Pigments, Paints and Varnishes Standards Policy Committee. It is identical with ISO 8781-1:1990 “Pigments and extenders Me
8、thods of assessment of dispersion characteristics Part 1: Assessment from the change in tinting strength of coloured pigments”, published by the International Organization for Standardization (ISO). In 1994 the European Committee for Standardization (CEN) accepted ISO 8781-1:1990 as European Standar
9、d EN ISO 8781-1:1995. As a consequence of implementing the European Standard this British Standard is renumbered as BS EN ISO 8781-1 and any reference to BS 3483-E1 should be read as a reference to BS EN ISO 8781-1. An introduction is included in ISO 8781-1:1990 which reads as follows. The degree of
10、 development of tinting strength of a coloured pigment in a dispersion is dependent on the amount of work done in the preparation of the dispersion of the pigment in a binder system. The ease with which the ultimate tinting strength is achieved may therefore be used to assess the ease of dispersion
11、of that pigment. Thus, if the ultimate tinting strength can be attained easily, the pigment is considered to be readily dispersible. The method described consists essentially of three steps: a) preparation in stages of a range of dispersions of the coloured pigment in accordance with an appropriate
12、part of ISO 8780; b) preparation of reduced pastes from each of these dispersions; c) determination of the rate of development of the tinting strength as a function of the amount of work done (this latter is related to the incremental stages of dispersion). The rate of development of tinting strengt
13、h is assessed either by calculating the percentage increase between two stages of dispersion or graphically. Cross-references International StandardCorresponding British Standard ISO 105-A01:1989BS 1006:1990 Methods of test for colour fastness of textiles and leather (Technically equivalent) ISO 591
14、:1977BS 1851:1978 Specification for titanium dioxide pigments for paints (Identical) BS 3483 Methods for testing pigments for paints ISO 787-24:1985Part A6:1988 Determination of relative tinting strength of coloured pigments and relative scattering power of white pigments using a photometer (Identic
15、al) ISO 8780-1:1990Part D1:1991 Methods of dispersion characteristics (Introduction) (Identical) ISO 8780-2:1990Part D2:1991 Method of dispersion for assessment of dispersion characteristics using an oscillatory shaking machine (Identical) ISO 8780-3:1990Part D3:1991 Method of dispersion for assessm
16、ent of dispersion characteristics using a high-speed impeller mill (Identical) Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8781-1:1995 BSI 04-2000iii A British Standard does not purport to include all the necessary provisions o
17、f a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. ISO 8780-4:1990Part D4:1991 Method of dispersion for assessment characteristics using a bead mill (Identical) ISO 8780
18、-5:1990Part D5:1991 Method of dispersion for assessment of dispersion characteristics using an automatic muller (Identical) ISO 8780-6:1990Part D6:1991 Method of dispersion for assessment of dispersion characteristics using a triple-roll mill (Identical) Summary of pages This document comprises a fr
19、ont cover, an inside front cover, pages i to iv, the EN ISO title page, pages 2 to 8, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. Licensed
20、 Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8781-1 March 1995 ICS 87.060
21、.10 Descriptors: Paints, pigments, extenders, tests, determination, dispersibility English version Pigments and extenders Methods of assessment of dispersion characteristics Part 1: Assessment from the change in tinting strength of coloured pigments (ISO 8781-1:1990) Pigments et matires de charge Mt
22、hodes dvaluation de la dispersibilit Partie 1: Evaluation partir de la variation de la force colorante (ISO 8781-1:1990) Pigmente und Fllstoffe Verfahren zur Beurteilung des Dispergierverhaltens Teil 1: Bestimmung der Farbstrkeentwicklung von Buntpigmenten (ISO 8781-1:1990) This European Standard wa
23、s approved by CEN on 1994-10-17. 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 nation
24、al standards may be obtained on application to the Central Secretariat 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 noti
25、fied to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdo
26、m. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights of reproduction and communication in any form and by any means reserved in all countries to CEN and its members Ref. No
27、. EN ISO 8781-1:1995 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8781-1:1995 BSI 04-2000 2 Foreword This European Standard has been taken over by the Technical Committee CEN/TC 298, Pigments and extenders, from the work of ISO/T
28、C 35, Paints and varnishes, of the International Organization for Standardization (ISO). 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 September 1995, and conflicting national standards shall be
29、 withdrawn at the latest by September 1995. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain
30、, Sweden, Switzerland and United Kingdom. NOTENormative references to international publications are given in Annex ZA (normative). Contents Page Foreword2 1Scope3 2Normative references3 3Definitions3 4Principle3 5Required supplementary information3 6Materials3 6.1White pigment3 6.2White pigment pas
31、te4 7Apparatus4 8Procedure4 8.1Preparation of the reduced paste4 8.2Assessment of the reduced paste4 9Photometric measurement5 10Expression of results5 10.1 Increase in tinting strength5 10.2 Tinting strength development graph5 11Significance of results5 12Test report6 Annex A (normative) Required s
32、upplementary information7 Annex ZA (normative) Normative references to international publications with their relevant European publications8 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8781-1:1995 BSI 04-20003 1 Scope This part of
33、 ISO 8781 specifies a method for assessing, on the basis of tinting strength, the dispersion characteristics of coloured pigments which have been dispersed by one of the methods described in ISO 8780. It should be read in conjunction with ISO 8780-1. The method is of general use for comparing simila
34、r pigments, for example a test pigment against an agreed reference pigment. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 8781. At the time of publication, the editions indicated were valid. All stan
35、dards are subject to revision, and parties to agreements based on this part of ISO 8781 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 105-A
36、01:1989, Textiles Tests for colour fastness Part A01: General principles of testing. ISO 591:1977, Titanium dioxide pigments for paints. ISO 787-24:1985, General methods of test for pigments and extenders Part 24: Determination of relative tinting strength of coloured pigments and relative scatterin
37、g power of white pigments Photometric methods. ISO 8780-1:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part 1: Introduction. ISO 8780-2:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part 2: Dispersio
38、n using an oscillatory shaking machine. 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 8780-4:1990, Pigments and extenders Methods of dispersion for assessment of dispersion character
39、istics Part 4: Dispersion using a bead mill. ISO 8780-5:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part 5: Dispersion using an automatic muller. ISO 8780-6:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteris
40、tics Part 6: Dispersion using a triple-roll mill. 3 Definitions For the purposes of this part of ISO 8781, the following definitions apply, plus the definitions given in ISO 8780-1. 3.1 coloured pigment paste a dispersion of a coloured pigment in a binder system 3.2 white pigment paste a dispersion
41、of a white pigment in a binder system 3.3 reduced paste (reduction paste) a paste resulting from mixing a coloured pigment paste (3.1) with a white pigment paste (3.2) 4 Principle The pigment under test and, if provided, the agreed reference pigment are each dispersed in stages under specified condi
42、tions in an agreed binder system. After each incremental dispersion stage, a portion of the mill base is taken and mixed separately with a white pigment paste to form a reduced paste. The tinting strength (K/S value) of each reduced paste is determined as described in ISO 787-24. The percentage incr
43、ease in tinting strength between two dispersion stages is calculated in order to assess the ease of dispersion of the pigment. Alternatively, a graph of the development of the tinting strength may be prepared. 5 Required supplementary information For any particular application, the test method speci
44、fied in this part of ISO 8781 needs to be completed by supplementary information. The items of supplementary information are given in Annex A. 6 Materials 6.1 White pigment The type of white pigment used shall be agreed between the interested parties, and shall be compatible with the binder system u
45、sed in the preparation of the coloured pigment paste. Unless otherwise agreed, titanium dioxide, grade R2, complying with the requirements of ISO 591 shall be used. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:19 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8781-1:1995 4 BSI 04-
46、2000 6.2 White pigment paste Prepare the paste by dispersing the white pigment (6.1) in the binder system agreed for the dispersion of the test pigment. The pigment concentration shall be agreed. NOTE 1For low-viscosity pastes, a suitable dispersion may contain about 20 % of titanium dioxide. For hi
47、gh-viscosity pastes, a suitable paste may contain about 40 % of titanium dioxide (see, for example, the paste specified in sub-clause 5.1 of ISO 787-24:1985). 7 Apparatus Ordinary laboratory apparatus and glassware, together with the following: 7.1 Balance, capable of weighing to 0,1 mg. 7.2 Film ap
48、plicator, to give films of adequate thickness from the reduced paste (see 8.2). 7.3 Substrates, for application of the reduced paste. Coated cards or glass plates have been found to be suitable. 7.4 Black and white contrast charts, for checking that an adequate film thickness of the reduced paste ha
49、s been applied (see 8.2). 7.5 Automatic muller, for preparation of the reduced paste when using a high-viscosity binder system, or beaker, of glass or polyethylene, for preparation of the reduced paste when using a low-viscosity binder system. 7.6 Spectrometer, capable of measuring at wave-lengths between 400 nm and 700 nm, or photometer, with filters appropriate to the pigment under test, or tristimulus colorimeter. 7.7 Cardboard template, of approximately 0,5 mm to 0,8 mm thickness, with a circular hole of th