1、BRITISH STANDARD BS EN ISO 8780-6:1995 Incorporating Amendment No.1 Pigments and extenders Methodsofdispersion for assessment of dispersion characteristics Part6: Dispersion using a triple-roll mill The European Standard EN ISO8780-6:1995 has the status of a BritishStandardBSENISO8780-6:1995 This Br
2、itishStandard, having been prepared under the directionof the Pigments, Paintsand Varnishes StandardsPolicy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 30April 1991 BSI 04-2000 The following BSI references relate to the work on this standard: Committee r
3、eference PVC/1 Draft for comment 86/51650 DC ISBN 0 580 19539 2 Committees responsible for this BritishStandard The preparation of this BritishStandard was entrusted by the Pigments, Paints and Varnishes Standards Policy Committee (PVC/-) to Technical Committee PVC/1, upon which the following bodies
4、 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 Development Associatio
5、n Amendments issued since publication Amd. No. Date Comments 8531 August 1995 Indicated by a sideline in the marginBSENISO8780-6:1995 BSI 04-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN ISO8780-6 3 Publication(s) referred to Inside back co
6、verBSENISO8780-6:1995 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 ISO8780-6:1990 “Pigments and extenders Methods of dispersion for assessment of dispersion characteri
7、stics Part6: Dispersion using a triple-roll mill”, published by the International Organization for Standardization (ISO). In 1994 the European Committee for Standardization (CEN) accepted ISO8780-6:1990 as European Standard EN ISO8780-6:1995. As a consequence of implementing the European Standard th
8、is BritishStandard is renumbered as BS EN8780-6 and any reference to BS3483-D6 should be read as a reference to BS EN ISO8780-6. 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. Compli
9、ance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding BritishStandard ISO787-24:1985 BS3483 Methods for testing pigments for paints Part A6:1988 Determination of relative tinting strength of coloured pigments and
10、 relative scattering power of white pigments using a photometer (Identical) ISO842:1984 BS4726:1986 Methods for sampling raw materials for paints and varnishes (Identical) ISO1524:1983 BS3900 Methods of test for paint Part C6:1983 Determination of fineness of grind (Identical) BS3483 Methods of test
11、ing pigments for paints ISO8780-1:1990 Part D1:1991 Methods of dispersion for assessment of dispersion characteristics (Introduction) (Identical) ISO8781-1:1990 Part E1:1991 Assessment of dispersion characteristics from the change in tinting strength of coloured pigments (Identical) ISO8781-2:1990 P
12、art E2:1991 Assessment of dispersion characteristics from the change in fineness of grind (Identical) ISO8781-3:1990 Part E3:1991 Assessment of dispersion characteristics from the change in gloss (Identical) Summary of pages This document comprises a front cover, an inside front cover, pagesi andii,
13、 theENISO title page, pages2 to8, 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.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO8780-
14、6 March 1995 ICS 87.060.10 Descriptors: Paints, pigments, extenders, dispersibility, dispersing English version Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part6:Dispersion using a triple-roll mill (ISO8780-6:1990) Pigments et matires de charge Mthodes d
15、e dispersion pour valuer la dispersibilit Partie6: Dispersion laide dune broyeuse tricylindre (ISO8780-6:1990) Pigmente und Fllstoffe Dispergierverfahren zur Beurteilung des Dispergierverhaltens Teil6: Dispergieren mit einem Dreiwalzwerk (ISO8780-6:1990) This European Standard was approved by CEN on
16、 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 national standards may be
17、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 notified to the Central
18、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 Kingdom. CEN European Comm
19、ittee 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.ENISO8780-6:1995EENI
20、SO8780-6:1995 BSI 04-2000 2 Foreword This European Standard has been taken over by 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
21、 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 withdrawn at the latest by September 1995. According to the CEN/CENELEC Internal Regulations, the following countries are bound to imple
22、ment this 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). Conte
23、nts Page Foreword 2 1 Scope 3 2 Normative references 3 3 Required supplementary information 3 4 Apparatus 3 5 Binder system 4 6 Sampling 4 7 Mill base composition 4 8 Procedure 4 8.1 Test portion 4 8.2 Pre-mixing 4 8.3 Dispersion 4 8.4 Stabilization 5 9 Test report 5 Annex A (normative) Required sup
24、plementaryinformation 6 Annex ZA (normative) Normative references tointernational publications with their relevantEuropean publications 7ENISO8780-6:1995 BSI 04-2000 3 1 Scope This part of ISO8780 specifies a method for the dispersion of pigments and extenders using a triple-roll mill. The results p
25、ermit conclusions to be drawn as to the behaviour of the products tested when dispersed using corresponding production machinery. This part of ISO8780 is for use in conjunction with the methods of assessment described in ISO8781, using an agreed binder system of high viscosity free from volatile mat
26、erials. It should be read in conjuction with ISO8780-1. 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 pigment and agreed reference pigment are carried out at the same temperature. The resu
27、lts 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 ISO8780 lie in the ease of handling of the equipment, the possibility of preparing adequate quantities o
28、f 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 formulations, a triple-roll mill of the kind described in this part of ISO8780 permits th
29、e 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 following standards contain provisions which, through reference in this text, constit
30、ute provisions of this part of ISO8780. 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 ISO8780 are encouraged to investigate the possibility of applying the most recent editions of the standards in
31、dicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO787-24:1985, General methods of test for pigments and extenders Part24: Determination of relative tinting strength of coloured pigments and relative scattering power of white pigments Photometric
32、methods. ISO842:1984, Raw materials for paints and varnishes Sampling. ISO1524:1983, Paints and varnishes Determination of fineness of grind. ISO8780-1:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part1: Introduction. ISO8781-1:1990, Pigments and ex
33、tenders Methods of assessment of dispersion characteristics Part1: Assessment from the change in tinting strength of coloured pigments. ISO8781-2:1990, Pigments and extenders Methods of assessment of dispersion characteristics Part2: Assessment from the change in fineness of grind. ISO8781-3:1990, P
34、igments and extenders Methods of assessment of dispersion characteristics Part3: Assessment from the change in gloss. 3 Required supplementary information For any particular application, the test method specified in this part of ISO8780 needs to be completed by supplementary information. The items o
35、f 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 and complying with the following requirements: a) Roll diameter: about150mm (if rolls of other d
36、imensions are used, this shall be agreed and shall be recorded in the test report). NOTE 2Results obtained with roll diameters of less than150mm will not correlate with those from production machinery. b) Roll length:200mm to300mm (if rolls of other dimensions are used, this shall be agreed and shal
37、l be recorded in the test report). c) Transmission ratio (“friction”) of the rolls:1:(2,5 to3):(5to6). d) Speed of the take-off roll:150r/min to200r/min. e) Roll contact force: capable of being set reproducibly up to a line pressure of80N per millimetre roll length (thecorresponding pressure gauge r
38、eading 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 allow comparison with other types of triple-roll mill. The line pressure is the contact force per millimetre of roll length
39、. In most cases, this parameter cannot be read directly from the pressure gauges but has to be calculated from the gauge readings.ENISO8780-6:1995 4 BSI 04-2000 Since dispersion is also influenced by parameters other than the line pressure, correlation between different types of triple-roll mill sha
40、ll be determined experimentally using information obtained from the mill manufacturer. f) Temperature control of the heating or cooling fluid: to 1 C, within the range from20 C to60 C. g) Any gap-setting device shall not be active during the operation of this test. 4.2 Spatula 5 Binder system The bi
41、nder system shall be agreed on between the interested parties. The test 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 sy
42、stem shall be used for all tests in the same series. 6 Sampling Take a representative sample of the product to be tested, as described in ISO842. 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 rhe
43、ological properties of the binder system. Preliminary experiments shall 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 pigmen
44、t paste specified in ISO787-24 has a viscosity considered to be the minimum value for this method. Typical pigment concentrations are: a) pigments of low binder demand pigment concentration65% (m/m); b) pigments of medium binder demand pigment concentration40% (m/m); c) pigments of high binder deman
45、d pigment concentration25% (m/m). 8 Procedure 8.1 Test portion For the apparatus specified in4.1, the mass of the mill base shall be not less than50g. If the criterion for assessing the dispersion characteristics is to be the evaluation of the development of tinting strength (seeISO8781-1), the mass
46、es of the pigment and of the binder system shall be determined to within0,5%. For other methods of assessment (for example fineness of grind, seeISO8781-2, and change of gloss, seeISO8781-3), wider tolerance ranges may be agreed on. 8.2 Pre-mixing Thoroughly mix the agreed amounts of pigment and bin
47、der 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 triple-roll mill and mix until a homogeneo
48、us dispersion has been obtained. NOTE 4The pre-mixing time will depend on the type and quantity of mill base. For50g of mill base,2min is generally sufficient Alternatively, by agreement between the interested parties, the pre-mixing can be carried out using a high-speed impeller mill (seeISO8780-3)
49、 or other suitable equipment. In this case, load the pre-mixed mill base on to the first roll of the triple-roll mill as in the above pre-mixing procedure, ensuring that its temperature is slightly below that of the pre-heated rolls. 8.3 Dispersion With the rolls still rotating following pre-mixing, set them to produce friction, i.e.set the roll contact forces at levels appropriate to the viscosity of the mill base (so that the second and third rolls have a thin, uniform coating of mill base on them). Contact between rolls one and t
