1、DEUTSCHE NORM Methods of dispersion for assessment of dispersion DisDersion usina an automatic muller characteristics of pigments and extenders Awil 1995 DIN - I EN IS0 8780-5 (IS0 8780-5 : 1990) English version of DIN EN IS0 8780-5 This standard incorporates the English version of I so 8780-5. ICs
2、87.060.10; 87.060.30 Descriptors: Pigments, extenders, dispersion characteristics, testing. Supersedes DIN IS0 8780-5, April 1992 edition. Pigmente und Fllstoffe; Dispergierverfahren zur Beurteilung des Dispergier- Verhaltens. Teil 5: Dispergieren mit einer Teller-Farbenausreibmaschine (IS0 8780-5 :
3、 1990) European Standard EN IS0 8780-5: 1995 has the status of a DIN Standard. A comma is used as the decimal marker. National foreword This standard has been published in accordance with a decision taken by CENTTC 298 to adopt, without alteration, International Standard IS0 8780-5 as a European Sta
4、ndard. The responsible German body involved in its preparation was the Normenausschu Pigmente und fiistoffe (Pigments and Extenders Standards Committee), Technical Committee Dispergierbarkeit. The DIN Standards corresponding to the International Standards referred to in clause 2 of the EN are as fol
5、lows: International Standard DIN Standard IS0 842 DIN V53242-1 and DIN 53242-4 IS0 8780-1 IS0 8781 -1 IS0 8781 -2 IS0 8781 -3 DIN EN IS0 8780-1 DIN EN IS0 8781-1 DIN EN IS0 8781-2 DIN EN IS0 8781-3 Amendments IS0 8780-5 having been adopted as a European Standard, the status of the corresponding DIN
6、Standard (DIN IS0 8780-5) has been changed accordingly. Previous editions DIN 53238-1 1: 1978-06, 1984-03; DIN IS0 8780-5: 1992-04. Continued overleaf. EN comprises 5 pages. Beuth Verlag GmbH, Berlin, has the exclusive right of sale for German Standards (DIN-Normen). DIN EN IS0 8780-5 Engl. Price gr
7、oup Sales No. 1106 10.95 Page 2 DIN EN IS0 8780-5 Standards referred to (and not included in Normative references and Annex ZA) DIN V 53242-1 Raw materials for paints and varnishes; sampling; concepts and general information DIN 53 242-4 Raw materials for paints and varnishes; sampling of solid matt
8、er DIN EN IS0 8780-1 Methods of dispersion for assessment of dispersion characteristics of pigments and extenders; intro- duction (IS0 8780-1 : 1990) DIN EN IS0 8781-1 Methods of assessment of dispersion characteristics of pigments and extenders; assessment from the change in tinting strength of col
9、oured pigments (IC0 8781-1:1990) DIN EN IS0 8781-2 Methods of assessment of dispersion characteristics of pigments and extenders; assessment from the change in fineness of grind (IS0 8781 -2:1990) DIN EN IS0 8781-3 Methods of assessment of dispersion characteristics of pigments and extenders; assess
10、ment from the change in gloss (IS0 8781-3:1990) EUROPEAN STANDARD NORME EUROPENNE EUROP!ISCHE NORM EN IS0 8780-5 March 1995 ICs 87.060.10; 87.060.30 Descriptors: Pigments, extenders, dispersion characteristics, testing. English version Pigments and extenders Methods of dispersion for assessment of d
11、ispersion characteristics Part 5: Dispersion using an automatic muller (IS0 8780-5 : 1990) Pigments et matires de charge; mthodes de dispersion pour valuer la dispersibilit. Partie 5: Dispersion laide dune broyeuse automatique plateaux Pigmente und Fllstoffe; Dispergier- verfahren zur Beurteilung de
12、s Dispergier- Verhaltens. Teil 5: Dispergieren mit einer Teller-Farbenausrei bmaschine (IS0 8780-5 : 1990) (IS0 8780-5: 1990) This European Standard was approved by CEN on 1994-10-17 and is identical to the IS0 Standard as referred to. CEN members are bound to comply with the CENKENELEC Internal Reg
13、ulations 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
14、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 Central Secretariat has the same status as the official versions. CEN members are the
15、national 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 f
16、r Normung Central Secretariat: rue de Stassart 36, 6-1050 Brussels _ O 1995. Copyright reserved to all CEN members. Ref. No. EN IS0 8780-5:1995 E Page 2 EN IS0 8780-5 : 1995 Foreword International Standard IS0 8780-5 : 1990 Pigments and extenders; methods of dispersion for assessment of dispersion c
17、haracteristics; dispersion using an automatic muller which was prepared by ISO/TC 35 Paints and varnishes of the International Organization for Standardization, has been adopted by Technical Committee CEN/TC 298 Pigments and extenders as a European Standard. This European Standard shall be given the
18、 status of a national standard, either by publication of an identical text or by endorsement, and conflicting national standards withdrawn, by September 1995 at the latest. In accordance with the CENKENELEC Internal Regulations, the following countries are bound to implement this European Standard:
19、Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of the International Standard IS0 8780-5 : 1990 was approved by CEN as a European Standard witho
20、ut any modi- fication. NOTE: Normative references to international publications are listed in Annex ZA (normative). 1 Scope This part of IS0 8780 specifies a method for the dis- persion of pigments and extenders using an auto- matic muller. It is suitable for comparing small samples in the quality c
21、ontrol of pigments. This part of IS0 8780 is for use in conjunction with the meth- ods of assessment described in IS0 8781. using an agreed binder system of high viscosity free from volatile solvents. It should be read in conjunction With IS0 8780-1. This method is restricted to high-viscosity mill
22、bases. The results obtained are not for comparison with dispersibility results obtained using other methods of dispersion. 2 Normative references The following standards contain provisions which, through reference in this text. constitute provisions of this part of IS0 8780. At the time of publicati
23、on, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of IS0 8780 are encouraged to investi- gate the possibility of applying lhe most recent edi- tions of the standards indicated below. Members of 4EC and IS0 maintain registers of
24、 currently valid International Standards. IS0 842:1984, Raw materials for paints and varnishes - Sampling. IS0 8780-1:1990. Pigments and extenders - Methods of dispersion for assessment of dispersion charac- terisiics - Part I: Introduction. IS0 8781-1 :1990, Pigments and extenders - Methods of asse
25、ssment of dispersion characteristics - Part I: Assessment from the change in tinting strength of coloured pigments. IS0 8781-2:1990, Pigments and extenders - Methods of assessment of dispersion characteristics - Parf 2: Assessment from fhe change in fineness of grind. IS0 8781-3:1990, Pigments and e
26、xtenders - Methods of assessment of dispersion characteristics - Part 3: Assessment from the change in gloss. 3 Required supplementary information For any particular application, the test method specified in this part of IS0 8780 needs to be com- pleted by supplementary information. The items of sup
27、plementary information are given in annex A. 4 Apparatus Ordinary laboratory apparatus and glassware, to- gether with the following: 4.1 Automatic muller. with ground-glass plates (see clause 8, third paragraph). The plates shall be. of diameter 180 mm to 250 mrn to which a variable and known force
28、of up to 1 kN may be applied. The driven plate shall be capable of rotating at between 70 r/min and 120 r/rnin and the apparatus shall have an arrangement for pre-setting the number of revol- utions in multiples of 25. 4.2 Spatula, with flexible steel or plastic blade. Page 3 EN IS0 8780-5: 1995 5 B
29、inder 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) of the binder system. The same
30、 batch of binder system shall be used for all tests in the same series. NOTE 1 To improve the precision of the method, it is recommended that binder systems free from volatile sol- vents are used. 6 Sampling Take a representative sample of the product to be tested, as described in IS0 842. 7 Mill ba
31、se composition The flow characteristics of a mill base depend on the binder demand of the pigment, its concentration in the mill base and the rheological properties of the binder system. Preliminary experiments shall there- fore be carried out to ascertain a suitable mill base composition. In order
32、to compare the dispersibilities of different pigments, it is important that the flow characteristics of the mill bases are similar and that mill bases are in the form of a sticky paste. This may necessitate the use of mill bases of different compositions. Typical pigment concentrations are: a) pigme
33、nts of low binder demand - pigment con- centration 65 % (mlm); b) pigments of medium binder demand - pigment concentration 40 % (mfm); c) pigments of high binder demand - pigment con- centration 25 % (m/nz). 8 Procedure If there are no water-cooled plates, take care that the temperature during the d
34、ispersion operation does not rise by more than 10C. Pre-condition new muller plates by milling a pigment in a suitable binder (system) for 1000 revolutions with a load applied to the plates. Remove and dis- card the paste. Before use, check that the surfaces of each plate have an even, opaque appear
35、ance and are free from score marks and polished areas. 8.1 Dispersion Weigh out agreed amounts of the binder system (clause 5) and pigment. The amounts weighed depend on the size of the muller plates. If the paste exudes from the edges of the plates during dispersion, the amount of the mill base sha
36、ll be reduced appropriately. If the criterion for assessing the dispersion charac- teristics is to be the evaluation of the development of tinting strength (see IS0 8781-I), the masses of the pigment and of the binder system shall be de- termined to within 0,5%. For other methods of as- sessment (fo
37、r example fineness of grind, see IS0 8781-2, and change of gloss, see IS0 8781-3), wider tolerance ranges may be agreed on. Place the binder system in the centre of the lower plate of the automatic muller (4.1). Sprinkle the pigment into the binder and mix together, using the minimum effort, with th
38、e aid of the spatula (4.2). Distribute the paste at several points at a distance of about 35 mm from the centre of the lower plate or spread it in the form of a ring with an internal di- ameter of 40 mm and an external diameter of 100 mm. NOTE 2 site shape as a pattern beneath the lower plate. Clean
39、 the spatula as much as possible by wiping it on the face of the upper plate of the muller. Close the plates of lhe muller and grind lhe mixture under an agreed load at an agreed rotational fre- quency and for an agreed number of revolutions in several successive stages (for example 50. 100, 200 and
40、 400 revolutions, as shown in figure i). Mid-way through each stage (for example after 25, 75, 150 or 300 revolutions), and at the end of each stage, homogenize the mill base by scraping together with the spatula, mixing (using minimum effort) and re- distributing it as described above. Take a test
41、por- tion at the end of each stage as agreed. It is advisable to lay a paper ring of the requi- Page 4 EN IS0 8780-5 : 1995 Ist stags 2nd atnpc 3rd Itage 4th stage rAwAv A V r x x x A O O O O I I111 I I I a 25 50 rr loo m 200 3aa 400 Number of rcvotutlwn Key : o homogenize x homogenize and take a te
42、st portion as agreed. Figure 1 - Example of grinding schedule When more than two test portions, or a test porlion amounting to 15% of the paste, have been taken, repeat the procedure on fresh mill base mixtures for each grinding stage. 8.2 Stabilization If necessary, for example if the mill base is
43、not sta- ble enough, stabilize each test portion after its re- moval from the mill base by adding, ror example, more binder and/or special additives. The procedure shall be agreed on between the interested parties. 9 Test report The test report shall contain at least the following in format ion: a)
44、all details necessary to identify the product tested; b) a reference lo this part of IC0 8780; c) the items of supplementary information referred to in annex A; d) any deviation from lhe procedure specified: e) the date(s) of the test. Page 5 EN IS0 8780-5: 1995 Annex A ( normative) Required supplem
45、entary information The items of supplementary information listed in this b) Binder system (see clause 5). annex shall be supplied as appropriate to enable the method to be carried out. c) Composition of the mill base (see clause 7) and its temperature (see clause 8). The information required should
46、preferably be agreed between the parties and be d) Dispersion conditions (load on the muller plates, derived, in part or totally, from an international or and rotational frequency and number of revol- national standard or other document related to the utions of the plates) (see 8.1). product under t
47、est. e) Stabilization procedure (see 8.2). a) Type and complete details of the automatic muller (see 4.1). Annex ZA (normative) Normative references to international publications with their relevant European publications This European Standard incorporates by dated or undated reference, provisions f
48、rom other publications. These normative references are cited at the appropriate places 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 only when incorporated in it by amend
49、ment or revision. For undated references the latest edition of the publication referred to applies including amendments). EN - Year Publication - Year Title - IS0 8781-1 1990 Pigments and extenders - Methods of EN IS0 8781 -1 1995 assessment of dispersion characteristics Part 1: Assessment from the change in tinting strength of coloured pigments IS0 8781 -2 1990 Pigments and extenders - Methods of EN IS0 8781-2 1995 assessment of dispersion characteristics Part 2: Assessment from the change in finess of grind IS0 8781-3 1990 Pigments and extenders - Methods of EN
