1、- CEN EN*IS0*8780- 4 95 3404589 0308529 886 _._ A . BRITISH STANDARD Pigments and extenders - Methods of dispersion for assessment of dispersion characteristics Part 4. Dispersion using a bead mill The European Standard EN Is0 8780-4 : 1995 has the status of a British Standard 5s EN IS0 1780-4 : 199
2、5 d BS 3483 : Part D4 : 1991 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 IS0 8780-4 : 1990 Pigments and extenders - Methods of dispersion for assessment of dispersion characteristi
3、cs - Part 4 : Dispersion using a bead mill, published by the International Organization for Standardization (ISO). in 1994 the Eurpoean Committee for standardization (0 accepted Is0 8780-4 : 1990 as European standard EN Is0 878-4 : 1995. As a consequence of implementing the European standard this Br
4、itish standard is renumbered Bs EN ISO878O-4 and any refemce to BS 3483: part D4 should be read as a reference to Bs EN IS0 8780-4: Cross-references international standard Is0 842 : 1984 ISO 2431 : 1984 IS0 8780-1 : 1990 IS0 8781-1 : 1990 ISO8781-2 : 1990 ISO8781-3 : 1990 Cornsponding British Standa
5、d BS 4726 : 1986 Methods for samping raw mate is the rotational frequency, in revolutions per minute, of the shaft; n 1 *-u- Figure 2 - Effedive diameter of discs The type, number and diameter of the discs, the ge- ometry of the vessel and the effective peripheral speed of the revolving discs shall
6、be agreed on and shall be recorded in the test report NOTE 1 A vessel with a double wall to allow circulation of a liquid to control the temperature is recommended, and a lid with a central aperlure may also be provided. NOTE 2 The nominal capacity of the vessel will depend on the volume of the mill
7、 base. Examples are given in table 1. 2 CEN EN*IS0*8780- Y 95 m 3404589 0108537 952 m IS0 8780-4:1990(E) Nominal capacity of vessel Mill base Diameter Height of of vessel vessel ml mm mm rnl 50 50 70 125 1 O0 65 a5 250 volume i Table 1 - Mill base volume and dimensions of bead mill vessel 200 I 1 1
8、85 110 500 4.2 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 shall be recorded in the test report. IC the spheres have never been used, they shall be con
9、ditioned by stirring them in a mill base (see clause 7). for example Cor 60 min, and cleaned. NOTE 3 The diaineter, density and total mass of the grinding spheres have a significant effect on the disper- sion obtained Glass spheres of a mean diameter of 1 mm to 2 mm and a density of 2.6 gkm3 f 0.2 g
10、lcrn3 have been found lo be suitable Steel balls with a diameter of 2 mrn lo 3 mm. a density of about 7.8 gkm3 and a hard- ness on Mohs scale of 7 to 8 may also be used. 5 Binder system The binder system shall be agreed on between the interested parties. The lest report shall state the binder, the s
11、olvent and the concenlration of 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 balch of binder system shall be used for all tests in the same series. 6 Sampling Take a representative sample of
12、 lhe product to he tested. as described in IS0 842 7 Mill base composition The viscosity o a mill base depends on !he binder demand of the pigment and its concentration in a given binder system. Preliminary experirrients shall therefore be carried oiit to ascertain a suitable mil! base composition T
13、he viscosity of the mill base during dispersion shall be such that the grinding spheres can move freely (see ctaiice i) while the bead mill is runciing This can be checked by obser- vation. For binder systems wiih flow times of 20 s to 40 s. determined with flow cup IS0 2431 No.6. the follow- ing pi
14、gment concentrations have been found to be suitable as starting points- pigments of low binder demand - pigment con- centration 25 Oh (ni;ni) lo 60 ?4 (rn/m); pigments of medium binder demand - pigmenl concentration 10 O b) a reference lo this part o IS0 8780; c) the items of supplementary informati
15、on referred to in annex A; d) any deviation from lhe procedure specified: e) the date(s) of the test. 4 CEN EN*ISO*780- 4 95 3404589 0308539 725 W . IS0 8780-4:1990(E) Annex A (normative) Required supplementary information The items of supplementary information listed in this annex shall be supplied
16、 as appropriate to enable lhe method to be carried out. its temperature (see 9.2). The information required should preferably be agreed between the interested parties and may be e) Pre-mixing lime (see 9 1) derived, in part or totally. from an international or national standard or other document rel
17、ated to the 9 Stirring times (see 9.2). product under lest g) Stabilization procediire (see 9 3) a) Type and complete details of the bead mill (see 4.1). h) De-aeration procedtire (see 9.4) b) Type. mean diameter. density and total mass of the grinding spheres (see 4.2). c) Binder system (see clause
18、 5). d) Composition of the mili base (see clame 7) and Annex ZA (normative) Normative references to international publications with their relevant European publications This European Standad mcoqxxates by dated or undateci reference, provisions from other publications. These normative references are
19、 cited at the appropriate piaces in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European standard oniy when in- in it by amendment or revision. For unated references the latest edition of t
20、he publication referred to applies (including amendments). hblication Year IS0 8781-1 1990 IS0 8781-2 1990 IS0 87813 1990 Is0 87W1 1990 1Itk EN Year pigmatSandt?xecteristics part 3: Assessmatfnnn the &unge an gloss PigmenLSand-Melhodsofd.ispersiOnfn- ENIS878-1 1995 aswsmm of d.lspersion chamceristic
21、s W 1: htraluction pigmats and QtenderS- Mewds of assessment of EN IS0 8781-2 1995 EN IS0 8781-3 1995 Publication($) referred to See national foreword. CEN EN*ISO*8780- 4 95 = 3Y04589 0108540 447 Amd. No. BS 3483 : Part D4 : 1991 IS0 8780-4 : 1990 Date lkxt affected This British Standard, having bee
22、n prepared under the direction of the Pigments, Paints and Varnishes Standards Policy Committee, was published undei the authority of the Standards Board and comes into effect on 30 April I991 o BSI I991 The following ES1 references relate to the work on this standard: Coniiiiittee reference PVC/I D
23、raft for comment 86152356 M: ISBN O 5sO 19.537 6 9104-4-0.7k- U Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Pigments, Paints and Varnishes Standards Policy Committee (PVC/-) to khnical Committee PVC/i, upon which the following bodies
24、 were represented: Aluminium Powder and Paste Association British Cement Association British Railways Board Chemical Industries Assaation oil and Colour Chemists Association Mntmakers Association of Great Britain Ltd. Titanium Pigment Manufacturers khnical Committee Zinc Development Association BSI,
25、 2 Park Street, London WiA 2BS BSI, Linford Wood, MNhn Keynes MK14 6LE PVC/ 1 CEN EN*ISO*8780- 4 95 = 3404589 01i085V3 383 AMD 8527 Amendment No. 1 published and effective from 15 August 1995 to BS 3483 : Part D4: 1991 Methods for testing pigments for paints Part D4. Methods of dispersion for assess
26、ment of disperslm characteristics using a bead mill NOTE. The European Committee on Standardization CEN has accepted LSO 8780-4 : 1990 as a European standard designated as EN IS0 88W : 1995. This amendment implements EN IS0 8780-4 : 1995 as a British Standard in the BS EN series. Implementation of E
27、uropean Standard Front page Delete the outside front page and substitate the attached. AMD 8527/August 1995 _-_-_- Nationai foreword At the end of paragraph 1 insert the following paragraph. in 1994 the Eurpoean Gommi.ee for Standadzation (CEN) accepted IS0 87804 : 1990 as European Standard EN Is0 8
28、7804 : 1995. As a consequence of implementing the European Standard this British Standard is renumbered BS EN Is0 878-4 and any reference to ES 3483 : Part D4 should be read as a reference to BS EN EO 87W. AMD 8527/August 1995 -_-_- EN title page and foreword Immediateiy after the National foreword,
29、 insert the aached EN title page and foreword. AMD 8527/Agust 1995 -_-_- New annex ZA Immediately after annex A insert the attached new annex ZA. AMD 8527/August 1995 -_-_-_-_-_- 9508-0.4k- PP Product code 005420 16 _- -+- - *- -e CEN EN*ISO*8780- 4 95 3404589 0108542 21T I BS EN IS0 BRITISH STANDAR
30、D Pigments and extenders - Methods of dispersion for assessment of dispersion characteristics Part 4. Dispersion using a bead mill i The European Stanard EN IS0 8780-4 : 1995 has the status of a British Standard i780-4 : 1995 CEN EN*ISO*8780- 4 95 3404589 EUROPEAN STANDARD NO- EUROPENNE: EN EXJROP-
31、NORM March 1995 ICs 87.060.10 Descriptors: paints, pigmenis. extenders, dispersb&ty. dispersing English version Pigrnents and extenders- Methods of dispersion for assessment of dispersiion chasacteriStics- Part 4 Dispersion using a bead mill (IS0 8780-4 : 1990) Pigments et matires de charge - Mthode
32、s de dispersion pour valuer la dispersibilit - Partie 4 Dispersion iaide dun disperseur (IS 8780-4 : 1990) Pigmente und Fullstoffe - Dispergierverfahren zur Beurteilung des Dispergierverhalkns - Teil 4 Dispergieren mit einer PerimuNe biies (Is0 8780-4 : 1990) This European Standard was approved by C
33、EN on 1994-10-17. CEN members are bound to comply with the CEN/CENELEC Internai Regulations which stipulate the conditions for giving this European Standard the status of a national sandard without any aiteration. Uptodate lists and bibliographical references concerning such nationai standards may b
34、e. obtained on appiication to the Central Secretariat or to any CEN member. This European Standard exists in three officiai veisions (English, Ei-ench, German). A version in any other language made by translation under the responsibility of a CEN member into its om language and notified to the Centr
35、al Secretariat has the same status as the official versions. CEN members are the nationai standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Irekind, Itaiy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European C
36、ommittee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels O 1995 AU rights of reproduction and communidon in any form and by any means reserved in ali countries to CEN and its members Ref. NO. EN Is0 8780-4 : 1
37、995 E - - CEN EN*IS0*8780- 4 95 m 3404589 0308544 O92 m Page 2 EN IS0 8780-4 : 1995 For e w o r d This European Standard has been taken over by the Technical Committee CENC 298, Pigments and extenders, from the work of M/C 35, Paints and varnishes, of the Intemational Organization for Standmikation
38、o). This European Standad shaii be given the stabs of a nafionai standard, either by publication of an ientical text or by endorsement, at the latest by Septmer 1995, and axiicing naiona standards shad be withram at the latest by September 1995. Acordng to the CENKENELEC hiemal Regulations, the foli
39、owing countries are bound to implement hk European Standard: Ausia, Belgium, Denmarlc, Finiand, Fiance, Germany, Greece, Iceland, ireland, Italy, Luxembourg, Netherlands, Norway, Po- spaui, Sweden, Switzerland and United Kingdom. NOTE. Normative referenm to inernatid publicatioos are given in annex
40、ZA (normaiive). - Page 3 EN IS0 8780-4 : 1995 Annex ZA (normative) Normative references to international publications with their relevant European publications This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited
41、at the appropriate places in the text and the publications are Iisted hereafter. For dated references, subsequent amenments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest eition of
42、the publication referred to applies (including amendments). Pubtication Year IS0 8781-1 1990 IS0 8781-2 1990 Is0 87813 1990 IS0 8780-1 1990 ntie pigments and Qtenders - Methods ofassesment of dispersion&m.cteristics Part 1: assess mat the change in tinting strength oj colouredpignzents pigments and
43、Qlenders- Methods of assessment of d.ispersioncha7nctens . tics Part 2: Assesnnatfmn the change in fineness of grind pigments and Qtaders- Methods of assessment of dispersion &mcterist.ics Part 3: Assessmat from the change in gloss Pigments and Qtaders - Methods of dispersion fol- assessment of d2sp
44、ersion. chamcterist2cs Part 1: Intmductm EN Year EN IS0 8781-1 1995 EN IS0 8781-2 1995 ENISO 87813 1995 ENISO8780-1 1995 .- . - - i- -_- - - 3404589 0304375 235 BS 3483 : Part D4 : 1991 National foreword This Part of BS 3483 has been prepared under the direction of the Pigments, Paints and Varnishes
45、 Standards Poiicy Committee. It is identical with IS0 8780-4 : 1990 Pigments and extenders - Methods of dispersion for assessment of dispersion characteristics - Part 4 : Dispersion using a bead miil, published by the International Organization for Standardization (ISO). In 1994 the Eurpoean Committ
46、ee for Standardization (CEN) accepted IS0 87804 : 1990 as European Standard EN IS0 87804 : 1995. As a consequence of implementing the European Standard this British Standard is renumbered BS EN IS0 878011 and any reference to BS 3483 : Part D4 should be read as a reference to BS EN IS0 8780-4. Cross
47、-references international standard Is0 842 : 1984 Is0 2431 : 1984 IS0 8780-1 1990 IS0 8781-1 : 1990 IS0 8781-2 : 1990 IS0 8781-3 : 1990 Corr&pondhg British Standard ES 4726 : 1986 Methods for sampiing raw materials for paints and varniches (Identical) BS 3900 Methods of test for paint Part A6 : 1986
48、 Determination of flow time by use of flow a cups (Identical) BS 3483 Methods of testing pigments for pdnts Part D1 : 1991 Methods of dispersion for assessment of dispersion characteristics (Introduction) (Identical) Part El : 1991 Assessment of dispersion characteristics from the change in tinting strength of coloured pigments (Identical) Fart E2 : 1991 Assessment of dispersion characteristics from the change in fineness of grind (Identical) Part E3 : 1991 Assessment of dispersion characteristics from the change in gloss (Identical) A r i Compliance with a British Standard does not o
