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1、BRITISH STANDARD BS EN ISO 8780-6:1995 Incorporating Amendment No. 1 Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part 6: Dispersion using a triple-roll mill The European Standard EN ISO 8780-6:1995 has the status of a British Standard Licensed Copy: shef
2、fieldun sheffieldun, na, Mon Nov 20 02:57:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8780-6:1995 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 Standards Board and
3、 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 86/51650 DC ISBN 0 580 19539 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the
4、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 Chemists Associati
5、on Paintmakers Association of Great Britain Ltd. Titanium Pigment Manufacturers Technical Committee Zinc Development Association Amendments issued since publication Amd. No.DateComments 8531August 1995 Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57
6、:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8780-6:1995 BSI 04-2000i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN ISO 8780-63 Publication(s) referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:11 GM
7、T+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8780-6:1995 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 8780-6:1990 “Pigments and extenders Methods of dispers
8、ion for assessment of dispersion characteristics Part 6: Dispersion using a triple-roll mill”, published by the International Organization for Standardization (ISO). In 1994 the European Committee for Standardization (CEN) accepted ISO 8780-6:1990 as European Standard EN ISO 8780-6:1995. As a conseq
9、uence of implementing the European Standard this British Standard is renumbered as BS EN 8780-6 and any reference to BS 3483-D6 should be read as a reference to BS EN ISO 8780-6. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are
10、 responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International StandardCorresponding British Standard ISO 787-24:1985BS 3483 Methods for testing pigments for paints Part A6:1988 Determination of
11、 relative tinting strength of coloured pigments and relative scattering power of white pigments using a photometer (Identical) ISO 842:1984BS 4726:1986 Methods for sampling raw materials for paints and varnishes (Identical) ISO 1524:1983BS 3900 Methods of test for paint Part C6:1983 Determination of
12、 fineness of grind (Identical) BS 3483 Methods of testing pigments for paints ISO 8780-1:1990Part D1:1991 Methods of dispersion for assessment of dispersion characteristics (Introduction) (Identical) ISO 8781-1:1990Part E1:1991 Assessment of dispersion characteristics from the change in tinting stre
13、ngth of coloured pigments (Identical) ISO 8781-2:1990Part E2:1991 Assessment of dispersion characteristics from the change in fineness of grind (Identical) ISO 8781-3:1990Part E3:1991 Assessment of dispersion characteristics from the change in gloss (Identical) Summary of pages This document compris
14、es a front cover, an inside front cover, pages i and ii, 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.
15、Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8780-6 March 1995 ICS 87.060.10 Descriptors: Paints, pigments, extenders, dispersibility, dispersing English version Pigments and extend
16、ers Methods of dispersion for assessment of dispersion characteristics Part 6: Dispersion using a triple-roll mill (ISO 8780-6:1990) Pigments et matires de charge Mthodes de dispersion pour valuer la dispersibilit Partie 6: Dispersion laide dune broyeuse tricylindre (ISO 8780-6:1990) Pigmente und Fl
17、lstoffe Dispergierverfahren zur Beurteilung des Dispergierverhaltens Teil 6: Dispergieren mit einem Dreiwalzwerk (ISO 8780-6:1990) This European Standard was approved by CEN on 1994-10-17. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for gi
18、ving 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 European Standard exists in three official ver
19、sions (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 national standards bodies of Austria, Belgium,
20、 Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart
21、 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. EN ISO 8780-6:1995 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8780-6:
22、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/TC 35, Paints and varnishes, of the International Organization for Standardization (ISO). This European Standard shall be given the status of a n
23、ational standard, either by publication of an identical text or by endorsement, at the latest by September 1995, and conflicting national standards shall be withdrawn at the latest by September 1995. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement th
24、is European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. NOTENormative references to international publications are given in Annex ZA (normative). Contents Pag
25、e Foreword2 1Scope3 2Normative references3 3Required supplementary information3 4Apparatus3 5Binder system4 6Sampling4 7Mill base composition4 8Procedure4 8.1Test portion4 8.2Pre-mixing4 8.3Dispersion4 8.4Stabilization5 9Test report5 Annex A (normative) Required supplementary information6 Annex ZA (
26、normative) Normative references to international publications with their relevant European publications7 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8780-6:1995 BSI 04-20003 1 Scope This part of ISO 8780 specifies a method for the
27、 dispersion of pigments and extenders using a triple-roll mill. The results permit conclusions to be drawn as to the behaviour of the products tested when dispersed using corresponding production machinery. This part of ISO 8780 is for use in conjunction with the methods of assessment described in I
28、SO 8781, using an agreed binder system of high viscosity free from volatile materials. It should be read in conjuction with ISO 8780-1. This method is restricted to high-viscosity mill bases. To improve the precision of the method, it is recommended that the dispersion procedures for the test pigmen
29、t and agreed reference pigment are carried out at the same temperature. The results obtained are not suitable for making comparisons with dispersibility results obtained using other methods of dispersion. NOTE 1The advantages of the triple-roll mill described in this part of ISO 8780 lie in the ease
30、 of handling of the equipment, the possibility of preparing adequate quantities of mill base for extensive evaluation procedures, the ease of cleaning and the possibility of correlating the results with those from production machinery. Unlike dispersing equipment for low-viscosity mill base formulat
31、ions, a triple-roll mill of the kind described in this part of ISO 8780 permits the processing of mill base formulations within a wide range of high viscosities. Owing to this greater flexibility, precise specification of suitable mill base formulations is unnecessary. 2 Normative references The fol
32、lowing standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 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 ISO 8780 are encouraged to
33、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 787-24:1985, General methods of test for pigments and extenders Part 24: Determination of relative tinting stre
34、ngth of coloured pigments and relative scattering power of white pigments Photometric methods. ISO 842:1984, Raw materials for paints and varnishes Sampling. ISO 1524:1983, Paints and varnishes Determination of fineness of grind. ISO 8780-1:1990, Pigments and extenders Methods of dispersion for asse
35、ssment of dispersion characteristics Part 1: Introduction. ISO 8781-1:1990, Pigments and extenders Methods of assessment of dispersion characteristics Part 1: Assessment from the change in tinting strength of coloured pigments. ISO 8781-2:1990, Pigments and extenders Methods of assessment of dispers
36、ion characteristics Part 2: Assessment from the change in fineness of grind. ISO 8781-3:1990, Pigments and extenders Methods of assessment of dispersion characteristics Part 3: Assessment from the change in gloss. 3 Required supplementary information For any particular application, the test method s
37、pecified in this part of ISO 8780 needs to be completed by supplementary information. The items of supplementary information are given in Annex A. 4 Apparatus Ordinary laboratory apparatus and glassware, together with the following: 4.1 Triple-roll mill, with temperature control unit and mixing unit
38、 and complying with the following requirements: a) Roll diameter: about 150 mm (if rolls of other dimensions are used, this shall be agreed and shall be recorded in the test report). NOTE 2Results obtained with roll diameters of less than 150 mm will not correlate with those from production machiner
39、y. b) Roll length: 200 mm to 300 mm (if rolls of other dimensions are used, this shall be agreed and shall be recorded in the test report). c) Transmission ratio (“friction”) of the rolls: 1 : (2,5 to 3) : (5 to 6). d) Speed of the take-off roll: 150 r/min to 200 r/min. e) Roll contact force: capabl
40、e of being set reproducibly up to a line pressure of 80 N per millimetre roll length (the corresponding pressure gauge reading in newtons per square millimetre is dependent on the design and shall be obtained from the mill manufacturer). Roll contact force shall be expressed as line pressure, to all
41、ow comparison with other types of triple-roll mill. The line pressure is the contact force per millimetre of roll length. In most cases, this parameter cannot be read directly from the pressure gauges but has to be calculated from the gauge readings. Licensed Copy: sheffieldun sheffieldun, na, Mon N
42、ov 20 02:57:11 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8780-6:1995 4 BSI 04-2000 Since dispersion is also influenced by parameters other than the line pressure, correlation between different types of triple-roll mill shall be determined experimentally using information obtained from the mi
43、ll manufacturer. f) Temperature control of the heating or cooling fluid: to 1 C, within the range from 20 C to 60 C. g) Any gap-setting device shall not be active during the operation of this test. 4.2 Spatula 5 Binder system The binder system shall be agreed on between the interested parties. The t
44、est report shall state the binder, the solvent and the concentration of the binder in the solvent, as well as giving information on the rheological properties (for example viscosity) of the binder system. The same batch of binder system shall be used for all tests in the same series. 6 Sampling Take
45、 a representative sample of the product to be tested, as described in ISO 842. 7 Mill base composition The flow characteristics of a mill base depend on the binder demand of the pigment, its concentration in the mill base and the rheological properties of the binder system. Preliminary experiments s
46、hall therefore be carried out to ascertain a suitable mill base composition and this composition shall be agreed on between the interested parties. The mill base shall have a high viscosity and a sticky nature. NOTE 3The white pigment paste specified in ISO 787-24 has a viscosity considered to be th
47、e minimum value for this method. Typical pigment concentrations are: a) pigments of low binder demand pigment concentration 65 % (m/m); b) pigments of medium binder demand pigment concentration 40 % (m/m); c) pigments of high binder demand pigment concentration 25 % (m/m). 8 Procedure 8.1 Test porti
48、on For the apparatus specified in 4.1, the mass of the mill base shall be not less than 50 g. If the criterion for assessing the dispersion characteristics is to be the evaluation of the development of tinting strength (see ISO 8781-1), the masses of the pigment and of the binder system shall be det
49、ermined to within 0,5 %. For other methods of assessment (for example fineness of grind, see ISO 8781-2, and change of gloss, see ISO 8781-3), wider tolerance ranges may be agreed on. 8.2 Pre-mixing Thoroughly mix the agreed amounts of pigment and binder system with the spatula (4.2). Pre-heat the rolls of the triple-roll mill (4.1) to an agreed temperature and set the first and second roll at the lowest pressure setting, leaving the third roll clear. Load the mill base on to the first roll, switch on the tri
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