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1、BRITISH STANDARD BS EN ISO 8781-2:1995 Incorporating Amendment No. 1 Pigments and extenders Methods of assessment of dispersion characteristics Part 2: Assessment from the change in fineness of grind The European Standard EN ISO 8781-2:1995 has the status of a British Standard Licensed Copy: sheffie
2、ldun sheffieldun, na, Mon Nov 20 02:57:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8781-2:1995 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 co
3、mes 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 86/52359 DC ISBN 0 580 19541 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Pig
4、ments, 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 Association
5、Paintmakers Association of Great Britain Ltd. Titanium Pigment Manufacturers Technical Committee Zinc Development Association Amendments issued since publication Amd. No.DateComments 8530August 1995 Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:22
6、 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8781-2:1995 BSI 04-2000i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN ISO 8781-23 Publication(s) referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:22 GMT+0
7、0:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8781-2:1995 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 8781-2:1990 “Pigments and extenders Methods of assessment
8、 of dispersion characteristics Part 2: Assessment from the change in fineness of grind”, published by the International Organization for Standardization (ISO). In 1994 the European Committee for Standardization (CEN) accepted ISO 8781-2:1990 as European Standard EN ISO 8781-2:1995. As a consequence
9、of implementing the European Standard this British Standard is renumbered as BS EN ISO 8781-2 and any reference to BS 3483-E2 should be read as a reference to BS EN ISO 8781-2. An introduction is included in ISO 8781-2:1990 which reads as follows. The change of fineness of grind of a pigment in a di
10、spersion is dependent on the amount of work done in the preparation of the dispersion of the pigment in a binder system. The ease with which ultimate fineness of grind is achieved may therefore be used to assess the dispersion characterisitics of that pigment. Thus, if the ultimate fineness of grind
11、 can be attained easily, the pigment is considered to be readily dispersible. 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. Compliance with a British Standard does not of itself con
12、fer immunity from legal obligations. Cross-references International StandardCorresponding British Standard ISO 1524:1983BS 3900 Methods of test for paints Part C6:1983 Determination of fineness of grind (Identical) BS 3483 Methods for testing pigments for paints ISO 8780-1:1990Part D1:1991 Methods o
13、f dispersion for assessment of dispersion characteristics (Introduction) (Identical) ISO 8780-2:1990Part D2:1991 Method of dispersion for assessment of dispersion characteristics using an oscillatory shaking machine (Identical) ISO 8780-3:1990Part D3:1991 Method of dispersion for assessment of dispe
14、rsion characteristics using a high-speed impeller mill (Identical) ISO 8780-4:1990Part D4:1991 Method of dispersion for assessment characteristics using a bead mill (Identical) ISO 8780-5:1990Part D5:1991 Method of dispersion for assessment of dispersion characteristics using an automatic muller (Id
15、entical) ISO 8780-6:1990Part D6:1991 Method of dispersion for assessment of dispersion characteristics using a triple-roll mill (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 6, an inside back cover and a b
16、ack 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 02:57:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDA
17、RD NORME EUROPENNE EUROPISCHE NORM EN ISO 8781-2 March 1995 ICS 87.060.10 Descriptors: Paints, pigments, extenders, tests, determination, dispersibility English version Pigments and extenders Methods of assessment of dispersion characteristics Part 2: Assessment from the change in fineness of grind
18、(ISO 8781-2:1990) Pigments et matires de charge Mthodes dvaluation de la dispersibilit Partie 2: Evaluation partir de la variation de la finesse de broyage (ISO 8781-2:1990) Pigmente und Fllstoffe Verfahren zur Beurteilung des Dispergierverhaltens Teil 2: Bestimmung der nderung der Mahlfeinheit (Krn
19、igkeit) (ISO 8781-2:1990) 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 alteration. Up-to-date lists an
20、d 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 translation under the responsibi
21、lity 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, Luxembourg, Netherlands, Norway, Por
22、tugal, 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 of reproduction and communication in any form and by any means reser
23、ved in all countries to CEN and its members Ref. No. EN ISO 8781-2:1995 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8781-2:1995 BSI 04-2000 2 Foreword This European Standard has been taken over by the Technical Committee CEN/TC
24、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 endorsement, at the latest by Septembe
25、r 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, Germany, Greece, Iceland, Ireland, Ital
26、y, 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 3Principle3 4Required supplementary information3 5Apparatus3 6
27、Procedure3 6.1Dispersion3 6.2Determination of fineness of grind4 7Expression of results4 8Test report4 Annex A (normative) Required supplementary information5 Annex ZA (normative) Normative references to international publications with their relevant European publications6 Licensed Copy: sheffieldun
28、 sheffieldun, na, Mon Nov 20 02:57:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8781-2:1995 BSI 04-20003 1 Scope This part of ISO 8781 specifies a method for assessing, on the basis of fineness of grind, the dispersion characteristics of pigments which have been dispersed by one of the metho
29、ds of dispersion described in ISO 8780. It should be read in conjunction with ISO 8780-1. The method is of general use for comparing similar pigments, for example a test pigment against an agreed reference pigment. 2 Normative references The following standards contain provisions which, through refe
30、rence in this text, constitute provisions of this part of ISO 8781. 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 8781 are encouraged to investigate the possibility of applying the most recent
31、 editions of the standards indicated below. Members of IEC and ISO maintain registers of currently valid International Standards. ISO 1524:1983, Paints and varnishes Determination of fineness of grind. ISO 8780-1:1990, Pigments and extenders Methods of dispersion for assessment of dispersion charact
32、eristics Part 1: Introduction. ISO 8780-2:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part 2: Dispersion using an oscillatory shaking machine. ISO 8780-3:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristic
33、s Part 3: Dispersion using a high-speed impeller mill. ISO 8780-4:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part 4: Dispersion using a bead mill. ISO 8780-5:1990, Pigments and extenders Methods of dispersion for assessment of dispersion character
34、istics Part 5: Dispersion using an automatic muller. ISO 8780-6:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part 6: Dispersion using a triple-roll mill. 3 Principle The pigment under test and, if provided, the agreed reference pigment are each disp
35、ersed in stages under specified conditions in an agreed binder system. After each incremental dispersion stage, a portion of the mill base is taken and its fineness of grind is determined as described in ISO 1524. The fineness-of-grind values are plotted graphically as a function of the dispersion w
36、ork done (expressed as time, number of revolutions, etc.). From the graph, the work necessary to obtain an agreed fineness of grind is determined. 4 Required supplementary information For any particular application, the test method specified in this part of ISO 8781 needs to be completed by suppleme
37、ntary information. The items of supplementary information are given in Annex A. 5 Apparatus Ordinary laboratory apparatus and glassware, together with the following: 5.1 Fineness-of-grind gauge, complying with the requirements of ISO 1524 maximum depth of groove(s) 50 4m or 100 4m, depending on the
38、pigment or extender and the resulting fineness of grind, but preferably 50 4m. 5.2 Spatula 6 Procedure 6.1 Dispersion Disperse each pigment sample in the agreed binder system at the agreed concentration using one of the methods described in ISO 8780. Carry out the dispersion of the mill base in at l
39、east four stages and select the intermediate stages such that they are approximately in geometric progression. The final stage should be selected so that the fineness of grind of the pigment sample is better than or equal to that agreed. The intermediate stages should correspond to successive halvin
40、g of the period required to attain the final stage. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8781-2:1995 4 BSI 04-2000 If the ease of dispersion of the pigment to be tested under the given conditions is not known and thus the m
41、aximum dispersion effort to be used cannot be defined, then it should be determined in initial exploratory tests. For this, it is recommended that the fineness of grind of the pigment for at least two dispersion stages is determined. These fineness-of-grind values are plotted using logarithmic scale
42、s for both axes and the line joining these plotted values is extrapolated to a suitable target level of dispersion. Suitable intermediate dispersion levels are then selected. NOTE 1A fineness of grind of 5 4m may be found to be a suitable target dispersion level, although for less easily dispersed p
43、igments 10 4m to 20 4m may be acceptable. 6.2 Determination of fineness of grind Using the spatula (5.2), take small samples from the mill base after each of the specified dispersion stages, and determine the fineness of grind in each case using the method described in ISO 1524. If the fineness of g
44、rind agreed as a target level is not attained after the last of the specified dispersion stages, proceed as instructed in 7.2. 7 Expression of results 7.1 Plot the fineness-of-grind readings, in micrometres, obtained in 6.2 as a function of the incremental dispersion stages (which may be expressed a
45、s time, number of revolutions, etc.), using a logarithmic scale for both axes. Connect the points with a smooth curve. NOTE 2Generally, nearly linear curves are obtained in this way, thus aiding interpolation. Determine the work necessary to attain the target fineness of grind, by interpolation, fro
46、m the graph, expressing the result as milling time, number of revolutions of an automatic muller, etc. 7.2 In cases where the agreed fineness of grind cannot be attained, report the fineness measured after the final dispersion stage as the highest practically attainable fineness of grind. 8 Test rep
47、ort 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 ISO 8781 and the relevant part of ISO 8780; c) the items of supplementary information referred to in Annex A; d) the dispersion work done (see
48、 7.1) and the corresponding target level of fineness of grind or, if the agreed target level was not achieved, the highest practically attainable fineness of grind together with the work required to reach it (see 7.2); e) the graph representing the development of fineness of grind (see 7.1); f) any
49、deviation from the procedure specified; g) the date(s) of the test. Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:22 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8781-2:1995 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. The information required should preferably be agreed between the interested parties and may be derived, in part or totally,
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