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 ISO8781-3:1995 has the status of a BritishStandardBSENISO8781-3:1995 This BritishStandar
2、d, having been prepared under the directionof the Pigments, Paintsand Varnishes StandardsPolicy Committee, waspublished under the authorityof the Standards Boardand comes into effect on 30 April1991 BSI04-2000 The following BSI references relate to the work on this standard: Committee reference PVC/
3、1 Draft for comment86/51651DC ISBN 0 580 19542 2 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 bodies were represent
4、ed: 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 Association Amendments iss
5、ued since publication Amd. No. Date Comments 8532 August 1995 Indicated by a sideline in the marginBSENISO8781-3:1995 BSI 04-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of EN ISO8781-3 3 Publication(s) referred to Inside back coverBSENISO8781-3
6、: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 ISO8781-3:1990 “Pigments and extenders Methods of assessment of dispersion characteristics Part3: Assessment from th
7、e change in gloss”, published by the International Organization for Standardization (ISO). In 1994 the European Committee for Standardization (CEN) accepted ISO8781-3:1990 as European Standard EN ISO8781-3:1995. As a consequence of implementing the European Standard this BritishStandard is renumbere
8、d as BS EN ISO8781-3 and any reference to BS3483-E3 should be read as a reference to BS EN ISO8781-3. An introduction is included in ISO8781-3:1990 which reads as follows. The development of specular gloss of a pigment in a dispersion is dependent primarily on the amount of work done in the preparat
9、ion of the dispersion of the pigment in a binder system and the ratio of pigment to the binder system. Theease with which the ultimate specular gloss of a dried coating of the dispersion is achieved may therefore be used to assess the dispersion characteristics of the pigment. Thus, if the ultimate
10、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 appropriate part of ISO8780; b) preparation of dried films of
11、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 development of specular gloss is assessed graphically. Cross-
12、references International Standard Corresponding BritishStandard ISO8780-1:1990 BS3483 Methods for testing pigments for paints Part D1:1991 Methods of dispersion for assessment of dispersion characteristics (Introduction) (Identical) ISO8780-2:1990 Part D2:1991 Method of dispersion for assessment of
13、dispersion characteristics using an oscillatory shaking machine (Identical) ISO8780-3:1990 Part D3:1991 Method of dispersion for assessment of dispersion characteristics using a high-speed impeller mill (Identical) ISO8780-4:1990 Part D4:1991 Method of dispersion for assessment of dispersion charact
14、eristics using a bead mill (Identical) ISO8780-5:1990 Part D5:1991 Method of dispersion for assessment of dispersion characteristics using an automatic muller (Identical) ISO8780-6:1990 Part D6:1991 Method of dispersion for assessment of dispersion characteristics using a triple-roll mill (Identical
15、)BSENISO8781-3:1995 BSI 04-2000 iii Although this standard makes reference to the forthcoming revision of ISO2813, the committee have reviewed the provisions of ISO2813:1978, which is identical to BS3900 “Methods of test for paint”, Part D5:1980 “Measurement of specular gloss of non-metallic paint f
16、ilms at20,60 and85 ”, and has decided that until the revision of ISO2813 is published, they are acceptable for use in conjunction with this Part of BS3483. It is intended to revise BS3900-D5 to become identical with the revision of ISO2813 when it is published. A British Standard does not purport to
17、 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. Summary of pages This document comprises a front cover, an inside front cover,
18、pagesi toiv, theENISO title page, 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.iv blankEUROPEAN STANDARD NORME EUROPENNE EUROPIS
19、CHE NORM EN ISO8781-3 March1995 ICS87.060.10 Descriptors: Paints, pigments, extenders, tests, determination, dispersibility English version Pigments and extenders Methods of assessment of dispersion characteristics Part3: Assessment from the change in gloss (ISO8781-3:1990) Pigments et matires de ch
20、arge Mthodes dvaluation de la dispersibilit Partie 3: Evaluation partir de la variation du brillant spculaire (ISO8781-3:1990) Pigmente und Fllstoffe Verfahren zur Beurteilung des Dispergierverhaltens Teil 3: Bestimmung der Glanzentwicklung (ISO8781-3:1990) This European Standard was approved by CEN
21、 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 may b
22、e 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 Centra
23、l 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 UnitedKingdom. CEN European Com
24、mittee 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 reserved in all countries to CEN and its members Ref.No.ENISO8781-3:1995EEN
25、ISO8781-3:1995 BSI 04-2000 2 Foreword This European Standard has been taken over by the 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 given the statu
26、s 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 bound to impleme
27、nt this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and UnitedKingdom. NOTENormative references to international publications are given in Annex ZA (normative). Contents
28、 Page Foreword 2 1 Scope 3 2 Normative references 3 3 Principle 3 4 Required supplementary information 3 5 Apparatus 3 6 Procedure 3 6.1 Preparation of pigment dispersion 3 6.2 Preparation of films for gloss measurement 4 6.3 Gloss measurements 4 7 Expression of results 4 8 Test report 4 Annex A (no
29、rmative) Required supplementaryinformation 5 Annex ZA (normative) Normative references tointernational publications with their relevantEuropean publications 6ENISO8781-3:1995 BSI 04-2000 3 1 Scope This part of ISO8781 specifies a method for assessing, on the basis of specular gloss, the dispersion c
30、haracteristics of pigments which have been dispersed by one of the methods of dispersion described in ISO8780. It should be read in conjunction with ISO8780-1. The method is of general use for comparing similar pigments, for example a test pigment against an agreed reference pigment. 2 Normative ref
31、erences The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO8781. 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 ISO8781 are e
32、ncouraged 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. ISO2813:, Paints and varnishes Determination of specular gloss of non-metallic paint films at20 degree
33、s,60 degrees and85degrees 1) . ISO8780-1:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part1: Introduction. ISO8780-2:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part2: Dispersion using an oscillato
34、ry shaking machine. ISO8780-3:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part3: Dispersion using a high-speed impeller mill. ISO8780-4:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part4: Dispersio
35、n using a bead mill. ISO8780-5:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part5: Dispersion using an automatic muller. ISO8780-6:1990, Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part6: Dispersion usin
36、g 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 made into a composition that is
37、 applied to a substrate and dried or stoved. The specular gloss of each dried film is determined as described in ISO2813. The gloss values are plotted graphically as a function of the dispersion stage (expressed for instance as time, number of revolutions of a muller or number of passes through a tr
38、iple-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 ISO8781 needs to be completed by supplementary information. Theit
39、ems 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 applying a coat of uniform thickness o
40、n the substrate(5.1), for example a spray gun, film applicator or proofing press. 5.3 Glossmeter, complying with the requirements of ISO2813 and having the agreed angle of incidence and reflectance. 5.4 Ventilated oven (if required). 6 Procedure 6.1 Preparation of pigment dispersion 6.1.1 Dispersion
41、 Disperse each pigment sample in the agreed binder system at the agreed concentration using one of the methods described in ISO8780. For the purpose of plotting the gloss development curve as described in clause7, take sufficient material from the mill base at each of the agreed stages of dispersion
42、 to permit preparation of films for gloss measurement. 1) To be published. (Revision of ISO2813:1978)ENISO8781-3:1995 4 BSI 04-2000 If removal of portions 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,
43、 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 1Guidance is given with regard to the “agreed dispersion stage” in the relevant part of ISO8780. 6.1.2 Adjustment of the composition of the mill base If t
44、he composition of the mill base does not correspond to that for the intended final coating, add the required ingredients until it is obtained. This is achieved by thorough stirring, preferably with a high-speed impeller. The stirring shall not be so vigorous as to affect the state of dispersion. Sel
45、ect 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 Application of coating The conditions of application have a significant effect on the gloss and shall therefore be the subject of agreement between the i
46、nterested parties and be strictly observed. Apply the portion of mill base, adjusted if necessary as described in6.1.2, 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
47、gloss, may still undergo changes as a result of flocculation, re-wetting, etc. Consequently, the ease of dispersion as determined by the method specified in this part of ISO8781 is also an indication of the stability of the pigment/binder system 6.2.2 Drying or stoving The conditions under which the
48、 coating is dried or stoved may have an effect on the gloss and shall be the subject of agreement between the interested parties and be strictly observed. Dry or stove the coated substrate under fume-free conditions or in the oven(5.4) under the agreed conditions. During drying or stoving, all coate
49、d substrates in one and the same test series shall have the same orientation either vertical or horizontal. 6.3 Gloss measurements After drying or stoving, measure the gloss values of the specimens in triplicate as described in ISO2813 and calculate the mean of the three results. Keep the geometric conditions constant within the same series of measurements (for the same gloss development curve). NOTE 3For the measurement of prints, an angle of45 is preferred (through this angle is not specified by ISO2813). If the target gloss level
