1、A BRITISH STANDARD Pigments and extenders - Methods of dispersion for assessment of dispersion characteristics Part 3. Dispersion using a high-speed impeller mill The European Standard EN IS0 87803 : 1995 has the status of a British Standard . 3s EN IS0 17803 : 1995 National foreword . This Part of
2、BS 3483 has been prepared under the direction of the Pigments, Paints and Varnishes Standards Policy Committee. It is identical with IS0 8780-3 : 1990 Pigments and extenders - Methods of dispersion for assessment of dispersion characteristics - Part 3 : Dispersion using a high-speed impeller mill, p
3、ublished by the International Organization for Standardization (ISO) . In 1994 the European Commiaee for standardizatjon (CEN) accepted Is0 87803 : 1990 as European standard EN Is0 87803 : 1994. As a consequence of implementing the European Standatxi this British standard is renumbered as WEN Is0 87
4、80-3 and any reference to J3S 3483 : Part D3 is the rotational frequency, in revolutions per minute, of the impeller shaft; m 1,3 D to 30 -I Figure 1 - Schematic section of a serrated-disc impeller mill 2 STD-BSI BS EN IS0 8780-3-ENGL 1775 lb24bb7 b77570 7bb = IS0 8780-31990(E) The type and diameter
5、 of the disc, the geometry of the vessel and the speed of the disc shall be agreed on and recorded in lhe tecl report. NOTE 2 A vessel with a double wall to allow circulation of a liquid to control the temperature is recommended, and a lid with a central aperture may also be provided. NOTE 3 The dia
6、meter of a vessel used in an industrial- scale mill is normally two lo three times the diameter of the impeller, or sometimes even greater. The vesselldisc geometry and the disc speed specified in this part of IS0 0780 make allowance for the small diameter of a lab- oratory disc. 4.2 Spatula. 5 Bind
7、er 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 the binder in the solvent, as well as giving information on the rheological properties (for example viscosity or flow time) of the binder system
8、. 7.2 Determination of mill base composition Add sufficient binder system to cover the impeller. Start the motor at the lowest speed. Make small additions of pigment and gradually increase the speed to that agreed. Observe the flow pattern throughout ,the whole operation and note how much pigment ha
9、s been added when a toroid is first formed Continue to add pigment until the toroid starts to collapse and again note the pigmenl mass added, Select a pigment concentration between these two points. 8 Procedure 8.1 Preliminaries Weigh the pre-determined amount (see 7.2) of the binder system into the
10、 vessel. Weigh the pre- determined amount (see 7.2) of the pigment into a separate container. If the criterion for assessing the dispersion charac- teristics is to be the evaluation of the development of tinting strenglh (see IS0 8781-l), the masses of the pigment and of lhe binder system shall be d
11、e- termined to within 0,5%. For other methods of as- The same batch of binder system shall be used for sessment (for example fineness of grind, see all tests in the same series. IS0 8781-2. and change of gloss, see IS0 8781-3). wider tolerance ranges may be agreed on. 6 Sampling 8.2 Pre-mixing If ap
12、propriate, bring the vessel and the binder sys- tem to the agreed temperature (see 8.3). Immerse the impeller to the agreed depth (see 4.1.2). Take a represen1a1ive sample Of the product to be lested. as described in IS0 842. 7 Mill base composition With the impeller running at a low speed, graduall
13、y incorporate the pigment within a period of 5 min. Add the Diament at such a rate that a small amount of unwetted pigment always remains visible on the surface. Stop the motor, raise the impeller and, us- ing a spatula (4.2). scrape off any pigment adhering to the impeller shaft and walls of the ve
14、ssel into the mili base. 8.3 Dispersion 7.1 General requirements It is essential that the mill base assumes a flow pattern in the form of a toroid (or doughnut). The concentrations of pignient and binder system re- quired to give this pattern shall be determined by prior experiment. Lowei- ihe impel
15、ler into lhe vessel to lhe agreed In order to develop high shear in the mill. a high- viscosity mill base is desirable. Thus, high pigment loadings and/or high binder-solids are usually re- commended. The best combination depends on the wetting properties of the binder system for the pigment being t
16、ested. NOTE 4 It may be preferable to operate the laboratory mill under non-ideal conditions so that differences be- tween pigments are exaggerated. lt has been found in practice that, with well-formulated mill bases, differences between easily dispersible pigments are minimized so that this test me
17、thod is insensitive. depth. Adjust the speed of rotation to that agreed. Confirm. from the flow pattern. that the mill base composition is satisfactory (see 7.2). If the now pat- lern is unsalisfaclory, adjust lhe amount of pigrnent or binder system in the vessel until the flow pattern is correct an
18、d then, using the revised proportions, repeal the procedure from 8.1. Take tecl portions of the mill base afer each of several (agreed) stirring times as follows: Stop the impeller after each of a niimber of agreed stirring times (for example 4 min. 8 min, 16 min. 3 STD-BSI BS EN IS0 8760-3-ENGL 197
19、5 LbZbb7 Ob77571 T2 IS0 8780-31990(E) 32 min) and take a small test portion. Measure the temperature of the mill base and adjust to an agreed, temperature before re-starting the impeller. NOTE 5 The method described can also be adopted as a pre-mix procedure for mill bases that have to be further di
20、spersed by a laboratory bead mill in accordance with IS0 8780-4. 8.4 Stabilization If necessary, for example if the mill base is not sta- ble enough, stabilize each test portion after its re- moval from the mill base by adding, for example, more binder and/or special additives. The procedure shall b
21、e agreed on between the interested parties. 8.5 De-aeration If necessary, allow any air bubbles within the test portions to escape before proceeding to assess the dispersion. The means by which this is achieved, for example by allowing to stand for a kw minutes. shall be agreed on between the intere
22、sted parties. 9 Test report The test report shall contain at least the following information: . a) all details necessary to identify the product tested: b) a reference io this pari of IS0 8780; c) the items of supplementary inforniation referred to in annex A: d) any deviation rom the procedure spec
23、ified: e) the dale(c) o the test. 4 Annex A (normative) Required supplementary information ,i 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 interest
24、ed parties and may be derived, in part or totally, from an international or national standard or other document related to the product und er test. a) Type and complete details of the impeller mill b) Binder system (see clause 5). c) Composition of the mill base (see 7.1) and ils temperature (see 8.
25、3). d) Stirring times (see 8.3). e) Stabilization procedure (see 8.4). r) De-aeration procedure (see 8.5). (see 4.1). - I II = - Publication(s) referred to I - - - II See national foreword. 5 A STD-BSI BS EN IS0 87130-3-ENGL 1995 Tb24bb9 Ob7fi3 b75 i EN IS0 87803 : 1995 Annex ZA (normative) Normativ
26、e references to international publications with their. relevant European publications I This European Stanard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed her
27、eafter. For dated references, subsequent amendments to or revisions of any of these publications appiy to this European Standard oniy when incorporated in it by amendment or rwision For undated references the latest edition of the publication refemxi to appies (including amendments). Publication IS0
28、 87W1 IS0 8781-1 IS0 8781-2 Is0 87813 Year 1990 1990 1990 1990 -tie Pigments and Qtenders- Methals of d.Espersion for assesment of d2spersion chumcteristh Part 1: Intduction pigments and exendtm - Methals of assessment of dispersion characteristics Part 1: Assessmentfivm the change in tinting stnmgt
29、h of cdouredpigments pigmats and aenim- Methals of czssessment of dispersion characteristics Part2: Assessmentfwm the change infinenas of grind pigmats and tztmem- Methals of assessmat of dispersion chamteristics Part 3: Assessment- the change in gloss EN Year ENIS08780-1 1995 EN IS0 8781-1 1995 EN
30、IS0 8781-2 1995 EN IS0 87813 1995 STDmBSI BS EN IS0 7-3-ENGL L995 1b2LibbS 0b7757Li 501 I Amd. No. BS 3483 : part D3 : 1991 IS0 8780.3 : 1990 Date Txt affected This British Standard, having been prepared under the direction of the Pgments, Wints and Varnishes Standards Pbiicy Committee, was publishe
31、d under the authority of the Standards Board and comes into effect on 30 A 1991 o BSI 1991 The foiiowing BSI references reiate to the work on this standata: Conunittee reference PVC/l haft for comment W52356 DC ISBNOoII#) 19536 8 9104 - 4 Committees responsible for this British Standard The preparat
32、ion of this British Standard was entrusted by the Pigments, 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 Indust
33、ries Association Oil and Colour Chemists Association Paintmakers Association of Great Britain Ltd Titanium Pigment Manufacturers chnical Committee Zinc Development Association Amendments issued since publication MI, 2 Park Street, London WU 2BS BSI, Linford Wood. Milton Keynes MK14 6LE PVCI 1 STD.BS
34、1 BS EN IS0 878-3-ENGL 1975 Lb24bb b79575 448 AMD 8528 Amendment No. 1 published and effective from 16 August 1995 to BS 3483 : Part D3 : 1991 Methods for testing pigments for paints Part D3. Methods of dispersion for assessment of dispersion characteristics using a high-speed impeller mill NOTE. Th
35、e European Committee on Stanardhtion (CEN) has accepted IS0 87803 : 1990 as a European Standard designated as EN IS0 87803 : 1996. This amendment implements EN IS0 87803 : 1995 as a British Standard in the BS EN series. Implementation of European Standard Front page Delete the outside front page and
36、 substitute the attached. - AMD 8628August 1990 II E _-_- - = - National foreword At the end of paragraph 1 insert the following paragraph. in 1994 the European Committee for Standardhtion (CEN) accepted IS0 87803 : 1990 as European Standard EN IS0 87803 : 1994. As a consequence of implementing the
37、European Standard this British Standard is renumbered as BS EN IS0 87803 and any reference to BS 3483 : Part D3 should be read as a reference to ES EN IS0 87803. AMD 8528iAugust 1996 .I E * * u) -_-_-_- EN tide page and foreword Immediately after the national foreword, insert the attached EN title p
38、age and foreword. 9508 Product code 00542004 ST1 STT.BSI BS EN IS0 13780-3-ENGL 1995 D- lb2qbb7 Ob7757b 384 D BRITISH STANDARD -m Pigments and extenders - Methods of dispersion for assessment of dispersion characteristics Part 3. Dispersion using a high-speed - impeller mill - The European Standard
39、EN IS0 87803 : 1995 has the status of a British Standard BS EN IS0 37803 : 1995 STCBSI BS EN IS0 8780-3-ENGL 1995 WpLb24bb7 b79577 210 = EUROPEAN STANDARD NORME EUR0PEE”E EUROP&KHE NORM EN IS 87803 March 1995 ICs 87.060.10 Descriptors: paints, pigments, extenders, dispersibility, dispersing English
40、version Pigments and extenders - Methods of dispersion for assessment of dispersion characteristic- Part 3: Dispersion using a highspeed impeller mill (IS0 87803 : 1990) pigments et hres de charge - Mthodes de dispersion pour vaieur la dispersibilit - Partie 3 Dispersion laide dune turbine disperseu
41、se grande vitesse Hochgeschwindigkeitsrhrer (E 87803 : 1990) Pigmente und Fullstoffe - Dispergierverfahren zur Beurteilung des Dispergierverhaitens - Teil 3 Dispersgieren mit einem (IS0 87803 : 1990) This European Standard was approved by CEN on 1994-10-17. CEN members are bound to comply with the C
42、ENKENELEC Intemal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibiiographical references concerning such national standards may be obtained on application to the Central Secretariat or to
43、any CEN member. This European Standard exists in three official versions (English, French, Gem). A version in any other language made by translation under the responsibfiw of a CEN member into its om language and notied to the Central Secretariat has the same status as the officiai versions. CEN mem
44、bers are the national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, My, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches
45、 Komitee fiir Normung Centrai Secretariat: rue de Stassart 36, E1060 Brussels O 1995 All rights or reproduction and communciation in any form and by any means reserved in ail countries to CEN and its members Ref. No. EN IS0 87803 : 1995 E STD-BSI BS EN- IS0 8780-3-ENGL 1995 Zb24bb7 Ob77578 157 D Pag
46、e 2 EN IS0 87803 : 1996 Foreword This European Standard has been taken over by the Technical Commiaee CEN/IY: 298, Pigments and extenders, hm the work of IsoRy= 35, Paints and varnishes, of the Inernaionai CaniWion for Stanaon (Ise). This European Standard shall be given the stahis of a nationai sta
47、ndard, either by publication of an identical text or by endorsement, at the latest by September 1995, and conflicting national standards shall be withchwn at the latest by September 1995. According to the CENICENELEC Internai Regulations, the following countries are bound to implement this European
48、Standad Austsia, Belgium, Denmask, Finland, France, Germany, Greece, Iceland, ireland, Italy, Luxembourg, Netheriands, Norway, Portugal, Spain, Sweden, Switzerland and UNM Kingdom. NOTE. Nonnative references to international publications are given in annex ZA (nonnative). STD-BSI BS EN IS 878D-3-ENG
49、L 1995-m Lb24bb9 0b79579 O73 Page 3 EN Is0 87803 : 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 nonnative references are cited at the appropriate plaes in the txt and the publications are listed hereafter. For dated references, subseque
