1、BRITISH STANDARD BS ISO 787-17:2002 General methods of test for pigments and extenders Part 17: Comparison of lightening power of white pigments ICS 87.060.10 BS ISO 787-17:2002 This British Standard, having been prepared under the direction of the Materials and Chemicals Sector Policy and Strategy
2、Committee, was published under the authority of the Standards Policy and Strategy Committee on 19 September 2002 BSI 19 September 2002 ISBN 0 580 40432 3 National foreword This British Standard reproduces verbatim ISO 787-17:2002 and implements it as the UK national standard. It supersedes BS 3483-A
3、5:1974 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee STI/1, Pigments, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which im
4、plement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication
5、does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/Euro
6、pean committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, p
7、ages ii to v, a blank page, pages 1 to 5, and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date CommentsINTERNATIONAL STANDARD ISO 787-17 Second edition 2002-08-01 Reference number ISO 787-17
8、:2002(E) General methods of test for pigments and extenders Part 17: Comparison of lightening power of white pigments Mthodes gnrales dessai des pigments et matires de charge Partie 17: Comparaison du pouvoir claircissant des pigments blancsBSISO78717:2002ISO -7872:71)E(200 ii ISO 2002 Ar llithgr se
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13、toc ehtnury fo tr ehtseuqeer. ISO copyrithg fofiec tsop esaCael 65 G 1121-HCeneva 02 Te.l + 22 14 10 947 11 Fax + 14 47 2290 9 74 E-liam copyrightsio.ch Web wwwsi.oc.h Prni detni Sztiwerldna BSISO78717:2002iiOSI 1-78772002:)E( ISO 2002 r llAithgs reservde iii Contents Page 1 Scope . 1 2 Normative re
14、ferences . 1 3 Reagent 1 4 Apparatus . 2 5 Sampling . 2 6 Procedure . 2 7 Expression of results 4 8 Test report 5 BSISO78717:2002iiiISO -7872:71)E(200 vi ISO 2002 Ar llithgr seresvde Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bod
15、ies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organization
16、s, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the I
17、SO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that som
18、e of the elements of this part of ISO 787 may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International Standard ISO787-17 was prepared by Technical Committee ISO/TC35, Paints and varnishes, Subcommittee SC 2, Pigments and extende
19、rs. This second edition cancels and replaces the first edition (ISO 787-17:1973), of which it constitutes a minor (editorial) revision. ISO 787 consists of the following parts, under the general title General methods of test for pigments and extenders: Part 1: Comparison of colour of pigments Part 2
20、: Determination of matter volatile at 105 C Part 3: Determination of matter soluble in water Hot extraction method Part 4: Determination of acidity or alkalinity of the aqueous extract Part 5: Determination of oil absorption value Part 7: Determination of residue on sieve Water method Manual procedu
21、re Part 8: Determination of matter soluble in water Cold extraction method Part 9: Determination of pH value of an aqueous suspension Part 10: Determination of density Pyknometer method Part 11: Determination of tamped volume and apparent density after tamping Part 13: Determination of water-soluble
22、 sulphates, chlorides and nitrates Part 14: Determination of resistivity of aqueous extract Part 15: Comparison of resistance to light of coloured pigments of similar types Part 16: Determination of relative tinting strength (or equivalent colouring value) and colour on reduction of coloured pigment
23、s Visual comparison method Part 17: Comparison of lightening power of white pigments Part 18: Determination of residue on sieve Mechanical flushing procedure Part 19: Determination of water-soluble nitrates (Salicylic acid method) Part 21: Comparison of heat stability of pigments using a stoving med
24、ium Part 22: Comparison of resistance to bleeding of pigments BSISO78717:2002ivOSI 1-78772002:)E( ISO 2002 r llAithgs reservde v Part 23: Determination of density (using a centrifuge to remove entrained air) Part 24: Determination of relative tinting strength of coloured pigments and relative scatte
25、ring power of white pigments Photometric methods Part 25: Comparison of the colour, in full-shade systems, of white, black and coloured pigments Colorimetric method BSISO78717:2002vANRETNIITOTS LANDNADRA OSI 1-78772002:)E( ISO 2002 r llAithgs reservde 1 General methods of test for pigments and exten
26、ders Part 17: Comparison of lightening power of white pigments 1 Scope This part of ISO 787 specifies a general method of test for comparing the lightening (reducing) power of a white pigment with the lightening power of an agreed sample of the same type. Two procedures (A and B) are described. Proc
27、edure A is quicker than procedure B and is suitable for testing one sample of pigment; procedure B is better for testing several samples, and especially if a pigment of unknown lightening power is being tested. NOTE When this general method is applicable to a given pigment, a cross-reference to it w
28、ill simply be included in the International Standard relating to that pigment, with a note of any detailed modification which may be needed in view of the special properties of the pigment in question. Only when this general method is not applicable to a particular pigment will a special method for
29、comparison of lightening power of white pigments be specified. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 787. For dated references, subsequent amendments to, or revisions of, any of the
30、se publications do not apply. However, parties to agreements based on this part of ISO 787 are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to a
31、pplies. Members of ISO and IEC maintain registers of currently valid International Standards. ISO 788, Ultramarine pigments for paints ISO 15528, Paints, varnishes and raw materials for paints and varnishes Sampling 3R e a g e n t 3.1 Blue paste, with the following composition: castor oil, medicinal
32、 quality: precipitated calcium sulfate, CaSO 4 2H 2 O: ultramarine blue complying with ISO 788: treated natural earth 1) : The paste shall be prepared as follows: Mix the treated natural earth in a beaker with sufficient of the castor oil to give a uniform paste and then gradually stir in the remain
33、ing castor oil. Heat the mixture so obtained to a temperature of and, after maintaining this temperature for about , stir in the ultramarine blue and calcium sulfate, adding them in small amounts. 1) A prepared bentonite is a suitable material. 500 g 475 g 5g 20 g 50 C 15 min BSISO78717:20021ISO -78
34、72:71)E(200 2 ISO 2002 Ar llithgr seresvde Disperse thoroughly the paste obtained, by passing through a roller mill or other suitable machine, and stir to homogenize the paste thoroughly, heating it if necessary. Store the paste in airtight containers, preferably with screw caps. 4 Apparatus 4.1 Pal
35、ette knife, with a tapered steel blade of the approximate dimensions to long, towide at its widest point and not less than wide at its narrowest point. 4.2 Glass slide, clear and colourless, or other suitable size. 4.3 Automatic muller, with ground-glass plates, preferably water-cooled, of diameter
36、to , to which a variable but known force of up to about may be applied. If the automatic muller does not have water-cooled plates, care shall be taken that temperature variation does not occur during the grinding operation. The driven glass plate should preferably have a speed of rotation of between
37、 and and the apparatus should preferably have an arrangement for pre-setting the number of revolutions in multiples of 25. 4.4 Plate, of ground glass or marble, for use when an automatic muller is not available. 4.5 Balance, accurate to . 4.6 Hand muller. 5 Sampling The sample of pigment used for th
38、e test shall be taken in accordance with the provisions of ISO 15528. 6 Procedure 6.1 Procedure A (see clause 1) 6.1.1 Incorporation of the white pigment into the blue paste by means of the automatic muller Weigh, to the nearest , of the blue paste (3.1) and place it in the middle of the clean lower
39、 plate of the muller (4.3). Weigh, to the nearest , the quantity ( ) of the agreed reference pigment indicated in Table 1 and incorporate it into the blue paste by gently working with the palette knife (4.1). When the white pigment has been wetted, spread the paste in a circle of approximately diame
40、ter around the centre of the lower plate and clean the palette knife by drawing it across the top plate. Close the muller plates, apply a force of about and grind in four stages of 25 revolutions, picking up the paste with the same palette knife and transferring it to the centre of the plate after e
41、ach stage. When the grinding has been completed, remove the paste and store it on a palette. 6.1.2 Incorporation of the white pigment into the blue paste by means of a hand muller or palette knife Weigh, to the nearest , of the blue paste and place it on the ground-glass or marble plate (4.4). Weigh
42、, to the nearest , the quantity ( ) of the agreed reference pigment indicated in Table 1 and disperse it using the palette knife or a hand muller for with as little of the blue paste as possible, to obtain a smooth paste. Add the remainder of the blue paste, a little at a time, to the rubbed-out mix
43、ture and thoroughly mix with the palette knife or hand muller, scraping up the paste frequently to ensure thorough mixing. Remove the paste, as prepared, from the plate and store it on a palette. 140 mm 150 mm 20 mm 25 mm 12,5 mm 150 mm 50 mm 180 mm 250 mm 1 000 N 70 r/min 120 r/min 0,001 g 1mg 5g 1
44、mg m 0 50 mm 1 000 N 1mg 5g 1mg m 0 5min BSISO78717:20022OSI 1-78772002:)E( ISO 2002 r llAithgs reservde 3 6.1.3 Procedure for the comparison Treat the test sample (see clause 5) in exactly the same manner as in 6.1.1 or 6.1.2, and determine the quantity of pigment ( ) which gives an intensity of co
45、lour equal to that of the paste of the agreed reference pigment. Spread the two pastes made with the test sample and with the agreed reference pigment in the same direction on the glass slide (4.2) in opaque strips not less than wide with touching edges not less than long. Compare the pastes for int
46、ensity of colour by examining the two strips in diffuse daylight through the glass, and on the surface, immediately after application. Where good daylight is not available, make the comparison in artificial daylight. 6.2 Procedure B (see clause 1) 6.2.1 Incorporation of the white pigment into the bl
47、ue paste by means of the automatic muller Prepare a series of standard pastes from the agreed reference pigment, with the quantities indicated in Table 2 and using the following procedure in each case: Weigh, to the nearest , of the blue paste (3.1) and place it in the middle of the clean lower plat
48、e of the muller (4.3). Weigh, to the nearest , one of the stated quantities of the agreed reference pigment indicated in Table 2 and incorporate it into the blue paste by gently working with the palette knife (4.1). When the pigment has been wetted, spread the paste in a circle of approximately diam
49、eter around the centre of the lower plate and clean the palette knife by drawing it across the top plate. Close the muller plates, apply maximum force and grind in four stages of 25 revolutions, picking up the paste with the same palette knife and transferring it to the centre of the plate after each stage. When the grinding has been completed, remove the paste fro
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