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1、BRITISH STANDARD BS EN ISO 8780-5:1995 Incorporating Amendment No. 1 Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part 5: Dispersion using an automatic muller The European Standard EN ISO 8780-5:1995 has the status of a British Standard Licensed Copy: she
2、ffieldun sheffieldun, na, Mon Nov 20 02:57:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8780-5:1995 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 an
3、d 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 86/52357 DC ISBN 0 580 19538 4 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 Associat
5、ion Paintmakers Association of Great Britain Ltd. Titanium Pigment Manufacturers Technical Committee Zinc Development Association Amendments issued since publication Amd. No.DateComments 8526August 1995 Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:5
6、7:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8780-5:1995 BSI 04-2000i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN ISO 8780-53 Publication(s) referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:10 G
7、MT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8780-5:1995 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 8780-5:1990 “Pigments and extenders Methods of disper
8、sion for assessment of dispersion characteristics Part 5: Dispersion using an automatic muller”, published by the International Organization for Standardization (ISO). In 1994 the European Committee for Standardization (CEN) accepted ISO 8780-5:1990 as European Standard EN ISO 8780-5:1995. As a cons
9、equence of implementing the European Standard this British Standard is renumbered as BS EN ISO 8780-5 and any reference to BS 3483-D5 should be read as a reference to BS EN ISO 8780-5. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standar
10、ds are 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 842:1984BS 4726:1986 Methods for sampling raw materials for paints and varnishes (
11、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 strength of coloured pig
12、ments (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 comprises a front cover, an
13、 inside front cover, pages i and ii, the EN ISO title page, pages 2 to 6, 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 Copy: sheff
14、ieldun sheffieldun, na, Mon Nov 20 02:57:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8780-5 March 1995 ICS 87.060.10 Descriptors: Paints, pigments, extenders, dispersibility, dispersing English version Pigments and extenders Methods of dispe
15、rsion for assessment of dispersion characteristics Part 5: Dispersion using an automatic muller (ISO 8780-5:1990) Pigments et matires de charge Mthodes de dispersion pour valuer la dispersibilit Partie 5: Dispersion laide dune broyeuse automatique plateaux (ISO 8780-5:1990) Pigmente und Fllstoffe Di
16、spergierverfahren zur Beurteilung des Dispergierverhaltens Teil 5: Dispergieren mit einer Teller-Farbenausreibmaschine (ISO 8780-5:1990) 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
17、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 European Standard exists in three offici
18、al 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 national standards bodies of Austria, Be
19、lgium, 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 St
20、assart 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 ISO 8780-5:1995 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI
21、 EN ISO 8780-5:1995 2 BSI 04-2000 Foreword This European Standard has been taken over by 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 st
22、atus 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 i
23、mplement 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). C
24、ontents Page Foreword2 1Scope3 2Normative references3 3Required supplementary information3 4Apparatus3 5Binder system3 6Sampling3 7Mill base composition3 8Procedure4 8.1Dispersion4 8.2Stabilization4 9Test report4 Annex A (normative) Required supplementary information5 Annex ZA (normative) Normative
25、references to international publications with their relevant European publications6 Figure 1 Example of grinding schedule4 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8780-5:1995 BSI 04-20003 1 Scope This part of ISO 8780 specifie
26、s a method for the dispersion of pigments and extenders using an automatic muller. It is suitable for comparing small samples in the quality control of pigments. This part of ISO 8780 is for use in conjunction with the methods of assessment described in ISO 8781, using an agreed binder system of hig
27、h viscosity free from volatile solvents. It should be read in conjunction with ISO 8780-1. 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
28、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 investi
29、gate 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 842:1984, Raw materials for paints and varnishes Sampling. ISO 8780-1:1990, Pigments and extenders Methods of dispersi
30、on for assessment 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
31、 of dispersion 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 te
32、st method specified 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 Automatic muller, with ground-glass plates (see clau
33、se 8, third paragraph). The plates shall be of diameter 180 mm to 250 mm to which a variable and known force of up to 1 kN may be applied. The driven plate shall be capable of rotating at between 70 r/min and 120 r/min and the apparatus shall have an arrangement for pre-setting the number of revolut
34、ions in multiples of 25. 4.2 Spatula, with flexible steel or plastic blade. 5 Binder system The binder 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 th
35、e 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. NOTE 1To improve the precision of the method, it is recommended that binder systems free from volatile solvents are used. 6 Sampling Take a represent
36、ative 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 shall therefo
37、re be carried out to ascertain a suitable mill base composition. In order to compare the dispersibilities of 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 bas
38、es of different compositions. 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). Licensed Copy: sheffieldun sh
39、effieldun, na, Mon Nov 20 02:57:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8780-5:1995 4 BSI 04-2000 8 Procedure If there are no water-cooled plates, take care that the temperature during the dispersion operation does not rise by more than 10 C. Pre-condition new muller plates by milling a
40、 pigment in a suitable binder (system) for 1 000 revolutions 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 marks and polished areas. 8.1 Dispersion Weigh out agreed amounts of
41、 the binder system (clause 5) 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. If the criterion for assessing the dispersion characteristics is to
42、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 determined 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 ran
43、ges 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 paste at several points at a distance of about 35 mm from t
44、he centre of the lower plate or spread it in the form of a ring with an internal diameter of 40 mm and an external diameter of 100 mm. NOTE 2It is advisable to lay a paper ring of the requisite shape as a pattern beneath the lower plate. Clean the spatula as much as possible by wiping it on the face
45、 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 example 50, 100, 200 and 400 revolutions, as shown in Figure 1). Mid-way through ea
46、ch stage (for example after 25, 75, 150 or 300 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 each stage as agreed. When more than tw
47、o test portions, or a test portion amounting to 15 % 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 portion after its removal from the mill
48、 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 tested; b) a reference to this part of
49、 ISO 8780; 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 schedule Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:10 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8780-5:1995 BSI 04-20005 Annex A (normative) Required supplementary information The items of supplementary information listed in this annex shall be supplied as appropriate to enable the method to be carried out.
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