1、BRITISH STANDARD BSENISO 8781-1:1995 Incorporating Amendment No.1 Pigments and extenders Methods of assessment of dispersion characteristics Part1:Assessment from the change in tinting strength of coloured pigments The European Standard ENISO8781-1:1995 has the status of a BritishStandardBSENISO8781
2、-1:1995 This BritishStandard, having been prepared under the directionof the Pigments, Paints and Varnishes Standards Policy Committee, was published under the authority of the Standards Board and comes into effect on 30April1991 BSI04-2000 The following BSI references relate to the work on this sta
3、ndard: Committee reference PVC/1 Draft for comment86/52358 DC ISBN 0 580 19540 6 Committees responsible for this British Standard The preparation of this BritishStandard was entrusted by the Pigments, Paints and Varnishes Standards Policy Committee (PVC/-) to Technical Committee PVC/1, upon which th
4、e following bodies were represented: Aluminium Powder and Paste Association British Cement Association British Railways Board Chemical Industries Association Oil and Colour Chemists Association Paintmakers Association of Great Britain Ltd Titanium Pigment Manufacturers Technical Committee Zinc Devel
5、opment Association Amendments issued since publication Amd. No. Date Comments 8525 August 1995 Indicated by a sideline in the marginBSENISO8781-1:1995 BSI 04-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of ENISO8781-1 3 Publication(s) referred t
6、o Inside back coverBSENISO8781-1:1995 ii BSI 04-2000 National foreword This Part of BS3483 has been prepared under the direction of the Pigments, Paints and Varnishes Standards Policy Committee. It is identical with ISO8781-1:1990 “Pigments and extenders Methods of assessment of dispersion character
7、istics Part1: Assessment from the change in tinting strength of coloured pigments”, published by the International Organization for Standardization (ISO). In1994 the European Committee for Standardization (CEN) accepted ISO8781-1:1990 as European Standard ENISO8781-1:1995. As a consequence of implem
8、enting the European Standard this BritishStandard is renumbered as BSENISO8781-1 and any reference to BS3483-E1 should be read as a reference to BSENISO8781-1. An introduction is included in ISO8781-1:1990 which reads as follows. The degree of development of tinting strength of a coloured pigment in
9、 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 of that pigment. Thus, if the ultimate tinting strength c
10、an 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 part of ISO8780; b) preparation of reduced pastes from ea
11、ch 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 strength is assessed either by calculating the percentage increas
12、e between two stages of dispersion or graphically. Cross-references International Standard Corresponding BritishStandard ISO105-A01:1989 BS1006:1990 Methods of test for colour fastness of textiles and leather (Technically equivalent) ISO591:1977 BS1851:1978 Specification for titanium dioxide pigment
13、s for paints (Identical) BS3483 Methods for testing pigments for paints ISO787-24:1985 Part A6:1988 Determination of relative tinting strength of coloured pigments and relative scattering power of white pigments using a photometer (Identical) ISO8780-1:1990 Part D1:1991 Methods of dispersion charact
14、eristics (Introduction) (Identical) ISO8780-2:1990 Part D2:1991 Method of dispersion for assessment of dispersion characteristics using an oscillatory shaking machine (Identical) ISO8780-3:1990 Part D3:1991 Method of dispersion for assessment of dispersion characteristics using a high-speed impeller
15、 mill (Identical)BSENISO8781-1:1995 BSI 04-2000 iii A British Standard does not purport to include all the necessary provisions of 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 ob
16、ligations. ISO8780-4:1990 Part D4:1991 Method of dispersion for assessment characteristics using a bead mill (Identical) ISO8780-5:1990 Part D5:1991 Method of dispersion for assessment of dispersion characteristics using an automatic muller (Identical) ISO8780-6:1990 Part D6:1991 Method of dispersio
17、n for assessment of dispersion characteristics using a triple-roll mill (Identical) Summary of pages This document comprises a front cover, an inside front cover, pagesi to iv, theENISO title page, pages2 to8, an inside back cover and a back cover. This standard has been updated (see copyright date)
18、 and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.iv blankEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM ENISO8781-1 March1995 ICS 87.060.10 Descriptors: Paints, pigments, extenders, tests, determination, dispersibility English vers
19、ion Pigments and extendersMethods of assessment of dispersion characteristics Part1:Assessment from the change in tinting strength of coloured pigments (ISO8781-1:1990) Pigments et matires de charge Mthodes dvaluation de la dispersibilit Partie1: Evaluation partir de la variation de la force coloran
20、te (ISO8781-1:1990) Pigmente und Fllstoffe Verfahren zur Beurteilung des Dispergierverhaltens Teil1: Bestimmung der Farbstrkeentwicklung vonBuntpigmenten (ISO8781-1:1990) This European Standard was approved by CEN on1994-10-17. CEN members are bound to comply with the CEN/CENELEC Internal Regulation
21、s 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 national standards may be obtained on application to the Central Secretariat or to any CEN member. This Europea
22、n 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 notified to the Central Secretariat has the same status as the official versions. CEN members are the nationa
23、l standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normun
24、g 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. ENISO8781-1:1995 EENISO8781-1:1995 BSI 04-2000 2 Foreword This European Standard has been taken over by
25、the Technical Committee CEN/TC298, Pigments and extenders, from the work of ISO/TC35, Paints and varnishes, of the International Organization for Standardization (ISO). This European Standard shall be given the status ofa national standard, either by publication of an identical text or by endorsemen
26、t, at the latest by September1995, and conflicting national standards shall be withdrawn at the latest by September1995. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Gree
27、ce, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. NOTENormative references to international publications are given in Annex ZA (normative). Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 4 Principle 3 5
28、Required supplementary information 3 6 Materials 3 6.1 White pigment 3 6.2 White pigment paste 4 7 Apparatus 4 8 Procedure 4 8.1 Preparation of the reduced paste 4 8.2 Assessment of the reduced paste 4 9 Photometric measurement 5 10 Expression of results 5 10.1 Increase in tinting strength 5 10.2 Ti
29、nting strength development graph 5 11 Significance of results 5 12 Test report 6 Annex A (normative) Required supplementary information 7 Annex ZA (normative) Normative references tointernational publications with their relevant European publications 8ENISO8781-1:1995 BSI 04-2000 3 1 Scope This part
30、 of ISO8781 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 ISO8780. It should be read in conjunction with ISO8780-1. The method is of general use for comparing simila
31、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 ISO8781. At the time of publication, the editions indicated were valid. All stand
32、ards are subject to revision, and parties to agreements based on this part of ISO8781 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. ISO105-A01:
33、1989, Textiles Tests for colour fastness PartA01: General principles of testing. ISO591:1977, Titanium dioxide pigments for paints. ISO787-24:1985, General methods of test for pigments and extenders Part24: Determination of relative tinting strength of coloured pigments and relative scattering power
34、 of white pigments Photometric methods. ISO8780-1:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part1: Introduction. ISO8780-2:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part2: Dispersion using an
35、oscillatory shaking machine. ISO8780-3:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part3: Dispersion using a high-speed impeller mill. ISO8780-4:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part4:
36、Dispersion using a bead mill. ISO8780-5:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part5: Dispersion using an automatic muller. ISO8780-6:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part6: Disper
37、sion using a triple-roll mill. 3 Definitions For the purposes of this part of ISO8781, the following definitions apply, plus the definitions given in ISO8780-1. 3.1 coloured pigment paste a dispersion of a coloured pigment in a binder system 3.2 white pigment paste a dispersion of a white pigment in
38、 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 conditions in an agreed bind
39、er system. After each incremental dispersion stage, aportion 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 ISO787-24. The percentage increase in tinting strength
40、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 specified in this part of ISO8
41、781 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 used in the preparation of
42、the coloured pigment paste. Unless otherwise agreed, titanium dioxide, gradeR2, complying with the requirements ofISO591 shall be used.ENISO8781-1:1995 4 BSI 04-2000 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 t
43、est pigment. The pigment concentration shall be agreed. NOTE 1For low-viscosity pastes, a suitable dispersion may contain about20% of titanium dioxide. For high-viscosity pastes, a suitable paste may contain about40% of titanium dioxide (see,for example, the paste specified in sub-clause5.1 of ISO78
44、7-24:1985). 7 Apparatus Ordinary laboratory apparatus and glassware, together with the following: 7.1 Balance, capable of weighing to0,1mg. 7.2 Film applicator, to give films of adequate thickness from the reduced paste (see8.2). 7.3 Substrates, for application of the reduced paste. Coated cards or
45、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 has been applied (see8.2). 7.5 Automatic muller, for preparation of the reduced paste when using a high-viscosity binder system, or beaker, of glass or
46、polyethylene, for preparation of the reduced paste when using a low-viscosity binder system. 7.6 Spectrometer, capable of measuring at wave-lengths between400nm and700nm, or photometer, with filters appropriate to the pigment under test, or tristimulus colorimeter. 7.7 Cardboard template, of approxi
47、mately0,5mm to0,8mm thickness, with a circular hole of the same diameter as the photometer (see7.6) port, for use in measurements on wet films. 8 Procedure 8.1 Preparation of the reduced paste 8.1.1 Select an appropriate procedure from ISO8780 to prepare the pigment dispersion. Take test portions of
48、 the coloured pigment paste at the chosen dispersion stages (see10.1). 8.1.2 Take suitable amounts of the coloured pigment paste and white pigment paste(6.2), weigh to an accuracy of0,5% or better, and mix to provide a reduced paste of suitable depth of shade (seenote2). Mix in accordance with the a
49、ppropriate procedure described in8.1.3. NOTE 2A suitable reference depth of shade would be between1/3 and1/25 of the reference depths for textiles (seeISO105-A01:1989, clause12) (e.g.reflectance or reflectance factor between15% and50%). 8.1.3 Use one of the following procedures, as appropriate: a) With a low-viscosity paste, mix the coloured pigment paste and the white pigment paste in the beaker (see7.5) by stirring with a glass rod or a spatula until the mixture is homogeneous. Ensure that the mixing is thorough and carried out in a u
