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1、BRITISH STANDARD BS EN ISO 8780-2:1992 Incorporating Amendment No. 1 Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part 2: Dispersion using an oscillatory shaking machine The European Standard EN ISO 8780-2:1995 has the status of a British Standard License
2、d Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8780-2:1992 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 Standard
3、s Board and 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 86/52354 DC ISBN 0 580 19535 X Committees responsible for this British Standard The preparation of this British Standard was entrus
4、ted by the 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 Chemist
5、s Association Paintmakers Association of Great Britain Ltd Titanium Pigment Manufacturers Technical Committee Zinc Development Association Amendments issued since publication Amd. No.DateComments 8529August 1995 Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon No
6、v 20 02:57:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8780-2:1992 BSI 04-2000i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN ISO 8780-23 Publication(s) referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 0
7、2:57:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8780-2:1992 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 8780-2:1990 “Pigments and extenders Methods
8、of dispersion for assessment of dispersion characteristics Part 2: Dispersion using an oscillatory shaking machine”, published by the International Organization for Standardization (ISO). It supersedes BS 3483-B5:1974, which is withdrawn. In 1994 the European Committee for Standardization (CEN) acce
9、pted ISO 8780-2:1990 as European Standard EN ISO 8780-2:1995. As a consequence of implementing the European Standard this British Standard is renumbered as BS EN ISO 8780-2:1995 and any reference to BS 3483-D2 should be read as a reference to BS EN ISO 8780-2. The Technical Committee has reviewed th
10、e provisions of ISO 787-10:1981, to which reference is made in the text, and has decided that they are acceptable for use in conjunction with this standard. ISO 787-10 is related to BS 3483 “Methods for testing pigments for paints”, Part B8:1982 “Determination of density (pyknometer method)”. A Brit
11、ish 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 obligations. Cross-references International StandardCorrespo
12、nding British Standard ISO 842:1984BS 4726:1986 Methods for sampling raw materials for paints and varnishes (Identical) ISO 2431:1984BS 3900 Methods of test for paints Part A6:1986 Determination of flow time by use of flow cups (Identical) BS 3483 Methods of testing pigments for paints ISO 8780-1:19
13、90Part 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 pigments (Identical) ISO 8781-2:1990Part E2:1991 Assessment of dispersion
14、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 inside front cover, pages i and ii, the EN ISO title page, pages 2 to
15、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. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:00 GMT+00:00 2006, Uncontrolle
16、d Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8780-2 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 Part 2: Dispersion u
17、sing an oscillatory shaking machine (ISO 8780-2:1990) Pigments et matires de charge Mthodes de dispersion pour valuer la dispersibilit Partie 2: Dispersion laide dune machine secousses (ISO 8780-2:1990) Pigmente und Fllstoffe Dispergierverfahren zur Beurteilung des Dispergierverhaltens Teil 2: Dispe
18、rgieren mit einer Schttelmaschine (ISO 8780-2:1990) 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 giving this European Standard the status of a national standard without any alter
19、ation. 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 versions (English, French, German). A version, in any other language made by trans
20、lation 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembour
21、g, 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 36, B-1050 Brussels 1995 All rights reserved or reproduction and communicatio
22、n in any form and by any means reserved in all countries to CEN and its members Ref. No. EN ISO 8780-2:1995 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8780-2:1995 BSI 04-2000 2 Foreword This European Standard has been taken ove
23、r 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 national standard, either by publication of an identical text or by en
24、dorsement, 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 this European Standard: Austria, Belgium, Denmark, Finland, France, Ger
25、many, 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 Page Foreword2 1Scope3 2Normative references3 3Required supplementary in
26、formation3 4Apparatus3 5Binder system4 6Sampling4 7Mill base4 7.1Composition4 7.2Volume5 8Volume of grinding spheres5 9Procedure5 9.1Filling the containers5 9.2Dispersion5 9.3Stabilization5 9.4De-aeration5 10Test report6 Annex A (normative) Required supplementary information7 Annex ZA (normative) No
27、rmative references to international publications with their relevant European publications8 Figure 1 Holder4 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8780-2:1995 BSI 04-20003 1 Scope This part of ISO 8780 specifies a method for
28、 the dispersion of pigments and extenders using an oscillatory shaking machine. The method is suitable for the preparation of dispersions of several samples in the quality control of pigments. This part is for use in conjunction with the methods of assessment described in ISO 8781, using an agreed b
29、inder system of low viscosity. It should be read in conjunction with ISO 8780-1. NOTE 1The advantage of the oscillatory shaking method is that several batches of small amounts of mill base can be tested simultaneously in a closed system where solvent loss is minimized. This method is restricted to l
30、ow-viscosity mill bases allowing free movement of the grinding spheres (see 7.1). It is not suitable for optimizing mill base formulations for other dispersing techniques. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions o
31、f 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 investigate the possibility of applying the most recent editions of the standards indicated below.
32、 Members of IEC and ISO maintain registers of currently valid International Standards. ISO 787-10:1981, General methods of test for pigments and extenders Part 10: Determination of density Pyknometer method. ISO 842:1984, Raw materials for paints and varnishes Sampling. ISO 2431:1984, Paints and var
33、nishes Determination of flow time by use of flow cups. ISO 8780-1:1990, Pigments and extenders Methods of dispersion 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
34、the change in tinting strength of coloured pigments. ISO 8781-2:1990, Pigments and extenders Methods of assessment 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
35、: Assessment from the change in gloss. 3 Required supplementary information For any particular application, the test method specified in this part of 8780 needs to be completed by supplementary information. The items of supplementary information are given in Annex A. 4 Apparatus Ordinary laboratory
36、apparatus and glassware, together with the following: 4.1 Paint-conditioning machine, in which the containers are subjected to 680 to 690 reciprocating strokes per minute through a distance of 16 mm and an oscillatory action through an angle of 15. 4.2 Holder, for several mill base containers, desig
37、ned for fastening to the centre axis of the shaking machine in such a way that the centre point of each mill base container is 70 mm from the centre axis of the shaking machine; the top and bottom of each mill base container are at the same distance from a horizontal plane through the centre axis of
38、 the shaking machine; the mean time-weighted position of the containers is vertical. The design shown in Figure 1 meets these requirements. 4.3 Containers, of a suitable type. Containers for the mill bases shall be of the same size and type as those used for the agreed reference pigments. Examples o
39、f suitable types are 250 ml glass or polyethylene bottles with screw caps lined with polyethylene inserts. The size and type of container shall be agreed on and shall be recorded in the test report. 4.4 Grinding spheres, of a suitable type. Spheres of the same size and type shall be used for all the
40、 mill bases under simultaneous test. The type, mean diameter and density shall be agreed on and shall be recorded in the test report. If the spheres have never been used, they shall be conditioned by shaking them in a mill base (see 7.1), for example for 60 min, and cleaned. NOTE 2The diameter, dens
41、ity and total mass of the grinding spheres have a significant effect on the dispersion obtained. Glass spheres of a mean diameter of 3 mm + 0,5 mm and a density of 2,6 g/cm3 0,2 g/cm3 have been found to be suitable. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:00 GMT+00:00 2006, Unco
42、ntrolled Copy, (c) BSI EN ISO 8780-2:1995 4 BSI 04-2000 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 the rheological proper
43、ties (for example, viscosity or flow time) of the binder system. The same batch of binder system 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 ISO 842. 7 Mill base 7.1 Composition The viscosity of a mill base depe
44、nds on the binder demand of the pigment and its concentration in a given binder system. Preliminary experiments shall therefore be carried out to ascertain a suitable mill base composition. The viscosity of the mill base during dispersion shall be such that the grinding spheres can move freely (see
45、clause 1). This can be checked by shaking the containers manually. For binder systems with flow times of 20 s to 40 s, determined with flow cup ISO 2431 No. 6, the following pigment concentrations have been found to be suitable as starting points: a) pigments of low binder demand pigment concentrati
46、on higher tan 40 % (m/m); Figure 1 Holder Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:00 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8780-2:1995 BSI 04-20005 b) pigments of medium binder demand pigment concentration 10 % (m/m) to 40 % (m/m); c) pigments of high binder demand p
47、igment concentration lower than 10 % (m/m). 7.2 Volume The mill base shall occupy approximately 30 % of the volume of the container (4.3). The mass of the pigment and of the binder system may be determined by using the following equations: Mass, mp, of pigment, in grams: Mass, mM, of binder system,
48、in grams: 8 Volume of grinding spheres The apparent volume of the grinding spheres (see note 2) shall be approximately 50 % of the total volume of the container. The same volume of grinding spheres shall be used in all tests in the same series. 9 Procedure 9.1 Filling the containers Unless otherwise
49、 agreed or found advisable (see note 3), weigh the grinding spheres (4.4) into the container (4.3). Add the required mass of binder system (mM), calculated in accordance with 7.2. Wet the grinding spheres with the binder system by tilting the container. Then add the required mass of pigment (mp), calculated in accordance with 7.2. Close the container. Wet the pigment by carefully tilting the container. NOTE 3If it is difficult to wet the pigment, it may be advisable to select a different sequence