1、BRITISH STANDARD BS EN ISO 8780-2:1992 Incorporating Amendment No.1 Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part2: Dispersion using an oscillatory shaking machine The European Standard EN ISO8780-2:1995 has the status of a British StandardBSENISO8780
2、-2:1992 This British Standard, having been prepared under the directionof the Pigments, Paintsand Varnishes StandardsPolicy Committee waspublished under the authorityof the Standards Boardand comes into effect on 30April1991 BSI 04-2000 The following BSI references relate to the work on this standar
3、d: Committee reference PVC/1 Draft for comment 86/52354 DC ISBN 0 580 19535 X 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 fol
4、lowing bodies were represented: 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 Developmen
5、t Association Amendments issued since publication Amd. No. Date Comments 8529 August 1995 Indicated by a sideline in the marginBSENISO8780-2:1992 BSI 04-2000 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 Text of ENISO8780-2 3 Publication(s) referred to Ins
6、ide back coverBSENISO8780-2:1992 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 ISO8780-2:1990 “Pigments and extenders Methods of dispersion for assessment of dispersion
7、 characteristics Part2: Dispersion using an oscillatory shaking machine”, published by the International Organization for Standardization(ISO). It supersedes BS3483-B5:1974, which is withdrawn. In1994 the European Committee for Standardization(CEN) accepted ISO8780-2:1990 as European Standard EN ISO
8、8780-2:1995. As a consequence of implementing the European Standard this BritishStandard is renumbered as BS EN ISO8780-2:1995 and any reference to BS3483-D2 should be read as a reference to BS EN ISO8780-2. The Technical Committee has reviewed the provisions of ISO787-10:1981, to which reference is
9、 made in the text, and has decided that they are acceptable for use in conjunction with this standard. ISO787-10 is related to BS3483 “Methods for testing pigments for paints”, Part B8:1982 “Determination of density (pyknometer method)”. A British Standard does not purport to include all the necessa
10、ry 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 Standard Corresponding BritishStandard ISO842:1984 BS4726:1986 Methods f
11、or sampling raw materials for paints and varnishes (Identical) ISO2431:1984 BS3900 Methods of test for paints Part A6:1986 Determination of flow time by use of flow cups (Identical) BS3483 Methods of testing pigments for paints ISO8780-1:1990 Part D1:1991 Methods of dispersion for assessment of disp
12、ersion characteristics (Introduction) (Identical) ISO8781-1:1990 Part E1:1991 Assessment of dispersion characteristics from the change in tinting strength of coloured pigments (Identical) ISO8781-2:1990 Part E2:1991 Assessment of dispersion characteristics from the change in fineness of grind (Ident
13、ical) ISO8781-3:1990 Part 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, theEN ISO title page, pages2 to8, an inside back cover and a back cover. This standard has be
14、en updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO8780-2 March1995 ICS 87.060.10 Descriptors: Paints, pigments, extenders, dispersibility, dispersin
15、g English version Pigments and extenders Methods of dispersion for assessment of dispersion characteristics Part2: Dispersion using an oscillatory shaking machine (ISO8780-2:1990) Pigments et matires de charge Mthodes de dispersion pour valuer la dispersibilit Partie2: Dispersion laide dune machine
16、secousses (ISO8780-2:1990) Pigmente und Fllstoffe Dispergierverfahren zur Beurteilung des Dispergierverhaltens Teil2: Dispergieren mit einer Schttelmaschine (ISO8780-2:1990) This European Standard was approved by CEN on1994-10-17. CEN members are bound to comply with the CEN/CENELEC Internal Regulat
17、ions 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 be obtained on application to the Central Secretariat or to any CEN member. This Euro
18、pean 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 Central Secretariat has the same status as the official versions. CEN members are the nati
19、onal standards bodies of Austria, Belgium, 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 No
20、rmung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1995 All rights reserved or reproduction and communication in any form and by any means reserved in all countries to CEN and its members Ref. No. EN ISO8780-2:1995 EENISO8780-2:1995 BSI 04-2000 2 Foreword This European Standard has been
21、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 status of a national standard, either by publication of an identical text or
22、 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 implement this European Standard: Austria, Belgium, Denmark, Finland, France,
23、 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). Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Required supple
24、mentary information 3 4 Apparatus 3 5 Binder system 4 6 Sampling 4 7 Mill base 4 7.1 Composition 4 7.2 Volume 5 8 Volume of grinding spheres 5 9 Procedure 5 9.1 Filling the containers 5 9.2 Dispersion 5 9.3 Stabilization 5 9.4 De-aeration 5 10 Test report 6 Annex A (normative) Required supplementary
25、 information 7 Annex ZA (normative) Normative references to international publications with their relevant European publications 8 Figure 1 Holder 4ENISO8780-2:1995 BSI 04-2000 3 1 Scope This part of ISO8780 specifies a method for the dispersion of pigments and extenders using an oscillatory shaking
26、 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 ISO8781, using an agreed binder system of low viscosity. It should be read in conjunction with IS
27、O8780-1. 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 low-viscosity mill bases allowing free movement of the grinding spheres(s
28、ee7.1). 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 of this part of ISO8780. At the time of publication, the editions indicated
29、 were valid. All standards are subject to revision, and parties to agreements based on this part of ISO8780 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
30、Standards. ISO787-10:1981, General methods of test for pigments and extenders Part10: Determination ofdensity Pyknometer method. ISO842:1984, Raw materials for paints and varnishes Sampling. ISO2431:1984, Paints and varnishes Determination of flow time by use of flow cups. ISO8780-1:1990, Pigments a
31、nd extenders Methods of dispersion for assessment of dispersion characteristics Part1: Introduction. ISO8781-1:1990, Pigments and extenders Methods of assessment of dispersion characteristics Part1: Assessment from the change in tinting strength of coloured pigments. ISO8781-2:1990, Pigments and ext
32、enders Methods of assessment of dispersion characteristics Part2: Assessment from the change in fineness of grind. ISO8781-3:1990, Pigments and extenders Methods of assessment of dispersion characteristics Part3: Assessment from the change in gloss. 3 Required supplementary information For any parti
33、cular application, the test method specified in this part of8780 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 Paint-conditioning machine, in w
34、hich the containers are subjected to680 to690 reciprocating strokes per minute through a distance of16mm and an oscillatory action through an angle of 15 . 4.2 Holder, for several mill base containers, designed for fastening to the centre axis of the shaking machine in such a way that the centre poi
35、nt of each mill base container is70mm 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 the shaking machine; the mean time-weighted position of the containers is vertical. The design
36、 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 of suitable types are250ml glass or polyethylene bottles with screw caps lined with polyethylene
37、 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 mill bases under simultaneous test. The type, mean diameter and density shall be agreed on and s
38、hall be recorded in the test report. If the spheres have never been used, they shall be conditioned by shaking them in a mill base(see7.1), for example for60min, and cleaned. NOTE 2The diameter, density and total mass of the grinding spheres have a significant effect on the dispersion obtained. Glas
39、s spheres of a mean diameter of3mm+0,5mm and a density of2,6g/cm 3 0,2g/cm 3have been found to be suitable.ENISO8780-2:1995 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
40、the binder in the solvent, as well as giving information on the rheological properties(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 de
41、scribed in ISO842. 7 Mill base 7.1 Composition The viscosity of a mill base depends 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
42、 during dispersion shall be such that the grinding spheres can move freely(seeclause1). This can be checked by shaking the containers manually. For binder systems with flow times of20s to40s, determined with flow cup ISO2431 No.6, the following pigment concentrations have been found to be suitable a
43、s starting points: a) pigments of low binder demand pigment concentration higher tan40%(m/m); Figure 1 HolderENISO8780-2:1995 BSI 04-2000 5 b) pigments of medium binder demand pigment concentration10%(m/m) to40%(m/m); c) pigments of high binder demand pigment concentration lower than10%(m/m). 7.2 Vo
44、lume The mill base shall occupy approximately30% 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, m p , of pigment, in grams: Mass, m M , of binder system, in grams: 8 Volume of grinding spheres The appare
45、nt volume of the grinding spheres(seenote2) shall be approximately50% 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 agreed or found advisable (seenote3), weigh the grind
46、ing spheres(4.4) into the container(4.3). Add the required mass of binder system (m M ), calculated in accordance with7.2. Wet the grinding spheres with the binder system by tilting the container. Then add the required mass of pigment(m p ), calculated in accordance with7.2. Close the container. Wet
47、 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 of preparing the containers and, if necessary, the mill base may be placed in the container first and stirred with a spatula prior to the addition of the g
48、rinding spheres. Complete the preparation of the full set of mill bases as quickly as possible in order to avoid differences in stirring or wetting time between the samples. If the criterion for assessing the dispersion characteristics is to be the evaluation of the development of tinting strength(s
49、eeISO8781-1), the masses of the pigment and of the binder system shall be determined to within0,5%. For other methods of assessment(for example fineness of grind, seeISO8781-2, and change of gloss, seeISO8781-3), wider tolerance ranges may be agreed on. 9.2 Dispersion Immediately after the last mill base has been prepared, place the containers in the holder(4.2) and clamp the assembly in the paint-conditioning machine(4.1). NOTE 4The intensity of the shaking process depends on the loading of the holder. If repeatable di
