1、BRITISH STANDARD BS EN ISO 8780-5:1995 Incorporating Amendment No.1 Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part5: Dispersion using an automatic muller The European Standard EN ISO8780-5:1995 has the status of a British StandardBSENISO8780-5:1995 Thi
2、s British Standard, having been prepared under the directionof the Pigments, Paintsand Varnishes StandardsPolicy Committee, waspublished under the authorityof the Standards Boardand comes intoeffecton 30April1991 BSI 04-2000 The following BSI references relate to the work on this standard: Committee
3、 reference PVC/1 Draft for comment 86/52357 DC ISBN 0 580 19538 4 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 bodie
4、s 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 Associati
5、on Amendments issued since publication Amd. No. Date Comments 8526 August 1995 Indicated by a sideline in the marginBSENISO8780-5:1995 BSI 04-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of ENISO 8780-5 3 Publication(s) referred to Inside back c
6、overBSENISO8780-5:1995 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 ISO8780-5:1990 “Pigments and extenders Methods of dispersion for assessment of dispersion character
7、istics Part5: Dispersion using an automatic muller”, published by the International Organization for Standardization(ISO). In1994 the European Committee for Standardization(CEN) accepted ISO8780-5:1990 as European Standard EN ISO8780-5:1995. As a consequence of implementing the European Standard thi
8、s BritishStandard is renumbered as BS EN ISO8780-5 and any reference to BS3483-D5 should be read as a reference to BS EN ISO8780-5. 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. Com
9、pliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding BritishStandard ISO842:1984 BS4726:1986 Methods for sampling raw materials for paints and varnishes (Identical) BS3483 Methods of testing pigments for pain
10、ts 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 Part E2:1991 Assessmen
11、t 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, pages i and ii, theEN ISOtitle pag
12、e, pages2 to6, 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 ISO8780-5 March1995 ICS 87.
13、060.10 Descriptors: Paints, pigments, extenders,dispersibility, dispersing English version Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part5: Dispersion using an automatic muller (ISO8780-5:1990) Pigments et matires de charge Mthodes de dispersion pour v
14、aluer la dispersibilit Partie5: Dispersion laide dune broyeuse automatique plateaux (ISO8780-5:1990) Pigmente und Fllstoffe Dispergierverfahren zur Beurteilung des Dispergierverhaltens Teil5: Dispergieren mit einer Teller-Farbenausreibmaschine (ISO8780-5:1990) This European Standard was approved by
15、CEN on1994-10-17. 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 ma
16、y 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 notified to the Cent
17、ral 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
18、Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights reserved of reproduction and communication in any form and by any means reserved in all countries to CEN and its members Ref. No. EN IS
19、O8780-5:1995 EENISO8780-5:1995 2 BSI 04-2000 Foreword This European Standard has been taken over by 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 give
20、n the status of a national standard, either by publication of an identical text or by endorsement, 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 boun
21、d to implement 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 (normati
22、ve). Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Required supplementary information 3 4 Apparatus 3 5 Binder system 3 6 Sampling 3 7 Mill base composition 3 8 Procedure 4 8.1 Dispersion 4 8.2 Stabilization 4 9 Test report 4 Annex A (normative) Required supplementary information 5 A
23、nnex ZA (normative) Normative references to international publications with their relevant European publications 6 Figure 1 Example of grinding schedule 4ENISO8780-5:1995 BSI 04-2000 3 1 Scope This part of ISO8780 specifies a method for the dispersion of pigments and extenders using an automatic mul
24、ler. It is suitable for comparing small samples in the quality control of pigments. 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 solvents. It should be read in conjunction with I
25、SO8780-1. This method is restricted to high-viscosity mill bases. The results obtained are not for comparison with dispersibility results obtained using other methods of dispersion. 2 Normative references The following standards contain provisions which, through reference in this text, constitute pr
26、ovisions 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 indicate
27、d below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO842:1984, Raw materials for paints and varnishes Sampling. ISO8780-1:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part1: Introduction. ISO8781-1:1990,
28、Pigments and extenders 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. IS
29、O8781-3:1990, Pigments 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 informati
30、on. The items of supplementary information are given in Annex A. 4 Apparatus Ordinary laboratory apparatus and glassware, together with the following: 4.1 Automatic muller, with ground-glass plates (seeclause8, third paragraph). The plates shall be of diameter180mm to250mm to which a variable and kn
31、own force of up to1kN may be applied. The driven plate shall be capable of rotating at between70r/min and120r/min and the apparatus shall have an arrangement for pre-setting the number of revolutions in multiples of25. 4.2 Spatula, with flexible steel or plastic blade. 5 Binder system The binder sys
32、tem 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 system shal
33、l be used for all tests in the same series. NOTE 1To improve the precision of the method, it is recommended that binder systems free from volatile solvents are used. 6 Sampling Take a representative sample of the product to be tested, as described in ISO842. 7 Mill base composition The flow characte
34、ristics 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 shall therefore be carried out to ascertain a suitable mill base composition. In order to compare the dispersibilities of
35、 different pigments, it is important that the flow characteristics of the mill bases are similar and that mill bases are in the form of a sticky paste. This may necessitate the use of mill bases of different compositions. Typical pigment concentrations are: a) pigments of low binder demand pigment c
36、oncentration65%(m/m); b) pigments of medium binder demand pigment concentration40%(m/m); c) pigments of high binder demand pigment concentration25%(m/m).ENISO8780-5:1995 4 BSI 04-2000 8 Procedure If there are no water-cooled plates, take care that the temperature during the dispersion operation does
37、 not rise by more than10 C. Pre-condition new muller plates by milling a pigment in a suitable binder(system) for1000revolutions with a load applied to the plates. Remove and discard the paste. Before use, check that the surfaces of each plate have an even, opaque appearance and are free from score
38、marks and polished areas. 8.1 Dispersion Weigh out agreed amounts of the binder system (clause5) and pigment. The amounts weighed depend on the size of the muller plates. If the paste exudes from the edges of the plates during dispersion, the amount of the mill base shall be reduced appropriately. I
39、f the criterion for assessing the dispersion characteristics is to be the evaluation of the development of tinting strength(seeISO8781-1), the masses 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
40、, and change of gloss, seeISO8781-3), wider tolerance ranges may be agreed on. Place the binder system in the centre of the lower plate of the automatic muller(4.1). Sprinkle the pigment into the binder and mix together, using the minimum effort, with the aid of the spatula(4.2). Distribute the past
41、e at several points at a distance of about35mm from the centre of the lower plate or spread it in the form of a ring with an internal diameter of40mm and an external diameter of100mm. NOTE 2It is advisable to lay a paper ring of the requisite shape as a pattern beneath the lower plate. Clean the spa
42、tula as much as possible by wiping it on the face of the upper plate of the muller. Close the plates of the muller and grind the mixture under an agreed load at an agreed rotational frequency and for an agreed number of revolutions in several successive stages(for example50,100,200 and400 revolution
43、s, as shown in Figure 1). Mid-way through each stage(forexample after25,75,150 or300 revolutions), and at the end of each stage, homogenize the mill base by scraping together with the spatula, mixing(using minimum effort) and redistributing it as described above. Take a test portion at the end of ea
44、ch stage as agreed. When more than two test portions, or a test portion amounting to15% of the paste, have been taken, repeat the procedure on fresh mill base mixtures for each grinding stage. 8.2 Stabilization If necessary, for example if the mill base is not stable enough, stabilize each test port
45、ion after its removal from the mill base by adding, for example, more binder and/or special additives. The procedure shall be agreed on between the interested parties. 9 Test report The test report shall contain at least the following information: a) all details necessary to identify the product tes
46、ted; b) a reference to this part of ISO8780; c) the items of supplementary information referred to in Annex A; d) any deviation from the procedure specified; e) the date(s) of the test. Figure 1 Example of grinding scheduleENISO8780-5:1995 BSI 04-2000 5 Annex A (normative) Required supplementary inf
47、ormation The items of supplementary information listed in this annex shall be supplied as appropriate to enable the method to be carried out. The information required should preferably be agreed between the interested parties and may be derived, in part or totally, from an international or national
48、standard or other document related to the product under test. a) Type and complete details of the automatic muller(see4.1). b) Binder system(seeclause5). c) Composition of the mill base(seeclause7) and its temperature(seeclause8). d) Dispersion conditions(load on the muller plates, and rotational fr
49、equency and number of revolutions of the plates) (see8.1). e) Stabilization procedure(see8.2).ENISO8780-5:1995 6 BSI 04-2000 Annex ZA (normative) Normative references to international publications with their relevant European publications This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of thes
