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1、BRITISH STANDARD BS EN ISO 8781-3:1995 Incorporating Amendment No. 1 Pigments and extenders Methods of assessment of dispersion characteristics Part 3: Assessment from the change in gloss The European Standard EN ISO 8781-3:1995 has the status of a British Standard Licensed Copy: sheffieldun sheffie
2、ldun, na, Mon Nov 20 02:57:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8781-3:1995 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 comes into eff
3、ect 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 86/51651 DC ISBN 0 580 19542 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Pigments, Paint
4、s 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 Paintmakers
5、Association of Great Britain Ltd Titanium Pigment Manufacturers Technical Committee Zinc Development Association Amendments issued since publication Amd. No.DateComments 8532August 1995 Indicated by a sideline in the margin Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:26 GMT+00:00 20
6、06, Uncontrolled Copy, (c) BSI BS EN ISO 8781-3:1995 BSI 04-2000i Contents Page Committees responsibleInside front cover National forewordii Foreword2 Text of EN ISO 8781-33 Publication(s) referred toInside back cover Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:26 GMT+00:00 2006, Un
7、controlled Copy, (c) BSI BS EN ISO 8781-3:1995 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 8781-3:1990 “Pigments and extenders Methods of assessment of dispersio
8、n characteristics Part 3: Assessment from the change in gloss”, published by the International Organization for Standardization (ISO). In 1994 the European Committee for Standardization (CEN) accepted ISO 8781-3:1990 as European Standard EN ISO 8781-3:1995. As a consequence of implementing the Europ
9、ean Standard this British Standard is renumbered as BS EN ISO 8781-3 and any reference to BS 3483-E3 should be read as a reference to BS EN ISO 8781-3. An introduction is included in ISO 8781-3:1990 which reads as follows. The development of specular gloss of a pigment in a dispersion is dependent p
10、rimarily on the amount of work done in the preparation of the dispersion of the pigment in a binder system and the ratio of pigment to the binder system. The ease with which the ultimate specular gloss of a dried coating of the dispersion is achieved may therefore be used to assess the dispersion ch
11、aracteristics of the pigment. Thus, if the ultimate specular gloss can be attained easily, the pigment is considered to be readily dispersible. The method described consists essentially of three steps: a) preparation in stages of a range of dispersions of the pigment in accordance with an appropriat
12、e part of ISO 8780; b) preparation of dried films of the dispersions and measurement of the specular gloss; c) determination of the rate of development of the specular gloss as a function of the amount of work done (the latter is related to the incremental stages of dispersion). The rate of developm
13、ent of specular gloss is assessed graphically. Cross-references International StandardCorresponding British Standard ISO 8780-1:1990 BS 3483 Methods for testing pigments for paints Part D1:1991 Methods of dispersion for assessment of dispersion characteristics (Introduction) (Identical) ISO 8780-2:1
14、990Part 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 dispersion characteristics using a high-speed impeller mill (Identical) ISO 8780-4:1990Part D4:1991 Me
15、thod of dispersion for assessment of dispersion characteristics using a bead mill (Identical) ISO 8780-5:1990Part D5:1991 Method of dispersion for assessment of dispersion characteristics using an automatic muller (Identical) ISO 8780-6:1990Part D6:1991 Method of dispersion for assessment of dispers
16、ion characteristics using a triple-roll mill (Identical) Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN ISO 8781-3:1995 BSI 04-2000iii Although this standard makes reference to the forthcoming revision of ISO 2813, the committee have
17、reviewed the provisions of ISO 2813:1978, which is identical to BS 3900 “Methods of test for paint”, Part D5:1980 “Measurement of specular gloss of non-metallic paint films at 20, 60 and 85”, and has decided that until the revision of ISO 2813 is published, they are acceptable for use in conjunction
18、 with this Part of BS 3483. It is intended to revise BS 3900-D5 to become identical with the revision of ISO 2813 when it is published. 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.
19、 Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i to iv, the EN ISO title page, pages 2 to 6, an inside back cover and a back cover. This standard has been updated (see
20、 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 02:57:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI iv blank Licensed Copy: sheffieldun sheffieldun, na, Mon Nov
21、20 02:57:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8781-3 March 1995 ICS 87.060.10 Descriptors: Paints, pigments, extenders, tests, determination, dispersibility English version Pigments and extenders Methods of assessment of dispersion ch
22、aracteristics Part 3: Assessment from the change in gloss (ISO 8781-3:1990) Pigments et matires de charge Mthodes dvaluation de la dispersibilit Partie 3: Evaluation partir de la variation du brillant spculaire (ISO 8781-3:1990) Pigmente und Fllstoffe Verfahren zur Beurteilung des Dispergierverhalte
23、ns Teil 3: Bestimmung der Glanzentwicklung (ISO 8781-3:1990) 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
24、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 official versions (English, French, German). A version in any other language made
25、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, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, L
26、uxembourg, 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 of reproduction and communication
27、 in any form and by any means reserved in all countries to CEN and its members Ref. No. EN ISO 8781-3:1995 E Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8781-3:1995 BSI 04-2000 2 Foreword This European Standard has been taken over
28、 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 end
29、orsement, 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, Germa
30、ny, 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 3Principle3 4Required supple
31、mentary information3 5Apparatus3 6Procedure3 6.1Preparation of pigment dispersion3 6.2Preparation of films for gloss measurement4 6.3Gloss measurements4 7Expression of results4 8Test report4 Annex A (normative) Required supplementary information5 Annex ZA (normative) Normative references to internat
32、ional publications with their relevant European publications6 Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8781-3:1995 BSI 04-20003 1 Scope This part of ISO 8781 specifies a method for assessing, on the basis of specular gloss, the
33、 dispersion characteristics of pigments which have been dispersed by one of the methods 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.
34、2 Normative references The following standards contain provisions which, through reference 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
35、of ISO 8781 are encouraged to investigate 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 2813:, Paints and varnishes Determination of specular gloss of non-metallic paint
36、 films at 20 degrees, 60 degrees and 85 degrees1). ISO 8780-1:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part 1: Introduction. ISO 8780-2:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part 2: Dispe
37、rsion using an oscillatory shaking machine. ISO 8780-3:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part 3: Dispersion using a high-speed impeller mill. ISO 8780-4:1990, Pigments and extenders Methods of dispersion for assessment of dispersion chara
38、cteristics Part 4: Dispersion using a bead mill. ISO 8780-5:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part 5: Dispersion using an automatic muller. ISO 8780-6:1990, Pigments and extenders Methods of dispersion for assessment of dispersion charact
39、eristics Part 6: Dispersion using a triple-roll mill. 3 Principle The pigment under test and, if provided, the agreed reference pigment are each dispersed in stages under specified conditions in an agreed binder system. After each incremental dispersion stage, a portion of the mill base is taken and
40、 made into a composition that is applied to a substrate and dried or stoved. The specular gloss of each dried film is determined as described in ISO 2813. The gloss values are plotted graphically as a function of the dispersion stage (expressed for instance as time, number of revolutions of a muller
41、 or number of passes through a triple-roll mill). From the graph, the dispersion work necessary to obtain an agreed specular reflection value is determined. 4 Required supplementary information For any particular application, the test method specified in this part of ISO 8781 needs to be completed b
42、y supplementary information. The items of supplementary information are given in Annex A. 5 Apparatus Ordinary laboratory apparatus and glassware, together with the following: 5.1 Substrate, for example glass panels for paint coatings and art paper for printing inks. 5.2 Applicator, suitable for app
43、lying a coat of uniform thickness on the substrate (5.1), for example a spray gun, film applicator or proofing press. 5.3 Glossmeter, complying with the requirements of ISO 2813 and having the agreed angle of incidence and reflectance. 5.4 Ventilated oven (if required). 6 Procedure 6.1 Preparation o
44、f pigment dispersion 6.1.1 Dispersion Disperse each pigment sample in the agreed binder system at the agreed concentration using one of the methods described in ISO 8780. For the purpose of plotting the gloss development curve as described in clause 7, take sufficient material from the mill base at
45、each of the agreed stages of dispersion to permit preparation of films for gloss measurement. 1) To be published. (Revision of ISO 2813:1978) Licensed Copy: sheffieldun sheffieldun, na, Mon Nov 20 02:57:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN ISO 8781-3:1995 4 BSI 04-2000 If removal of port
46、ions of the mill base causes a significant change in the conditions of dispersion, for example by altering the ratio of mill base to grinding spheres, a separate mill base shall be made up for each dispersion stage and each of these mill bases shall be dispersed under identical conditions. NOTE 1Gui
47、dance is given with regard to the “agreed dispersion stage” in the relevant part of ISO 8780. 6.1.2 Adjustment of the composition of the mill base If the composition of the mill base does not correspond to that for the intended final coating, add the required ingredients until it is obtained. This i
48、s achieved by thorough stirring, preferably with a high-speed impeller. The stirring shall not be so vigorous as to affect the state of dispersion. Select the procedure and the sequence of addition so that flocculation or separation is avoided. 6.2 Preparation of films for gloss measurement 6.2.1 Ap
49、plication of coating The conditions of application have a significant effect on the gloss and shall therefore be the subject of agreement between the interested parties and be strictly observed. Apply the portion of mill base, adjusted if necessary as described in 6.1.2, as soon as possible to the substrate under the agreed conditions, ensuring that the surface of the film is free from any imperfection. NOTE 2The degree of dispersion, and thus the gloss, may still undergo changes as a result of flocculation, re-w
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