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1、A Reference number ISO 3262-2:1998(E) INTERNATIONAL STANDARD ISO 3262-2 First edition 1998-07-01 Extenders for paints Specifications and methods of test Part 2: Barytes (natural barium sulfate) Matires de charge pour peintures Spcifications et mthodes dessai Partie 2: Barytine (sulfate de baryum nat
2、urel) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 19:30:20 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3262-2:1998(E) ISO 1998 All rights re
3、served. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56
4、CH-1211 Genve 20 Switzerland Internetisoiso.ch Printed in Switzerland ii Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO tec
5、hnical 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 organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closel
6、y with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. 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 %
7、 of the member bodies casting a vote. International Standard ISO 3262-2 was prepared by Technical Committee ISO/TC 35, Paints and varnishes, Subcommittee SC 2, Pigments and extenders. Together with the other parts (see below), this part of ISO 3262 cancels and replaces ISO 3262:1975, which has been
8、technically revised. Part 1 comprises the definition of the term extender and a number of test methods that are applicable to most extenders, whilst part 2 and the following parts specify requirements and, where appropriate, particular test methods for individual extenders. At present, the following
9、 parts of ISO 3262 are published or in preparation, under the general title Extenders for paints Specifications and methods of test: Part 1: Introduction and general test methods Part 2: Barytes (natural barium sulfate) Part 3: Blanc fixe Part 4: Whiting Part 5: Natural crystalline calcium carbonate
10、 Part 6: Precipitated calcium carbonate Part 7: Dolomite Part 8: Natural clay Part 9: Calcined clay Part 10: Natural talc/chlorite in lamellar form Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for R
11、esale, 04/23/2007 19:30:20 MDTNo reproduction or networking permitted without license from IHS -,-,- ISOISO 3262-2:1998(E) iii Part 11: Natural talc, in lamellar form, containing carbonates Part 12: Muscovite-type mica Part 13: Natural quartz (ground) Part 14: Cristobalite Part 15: Vitreous silica P
12、art 16: Aluminium hydroxides Part 17: Precipitated calcium silicate Part 18: Precipitated sodium aluminium silicate Part 19: Precipitated silica Part 20: Fumed silica Part 21: Silica sand (unground natural quartz) Part 22: Diatomaceous earth (kieselguhr) Copyright International Organization for Stan
13、dardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 19:30:20 MDTNo reproduction or networking permitted without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with
14、ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 19:30:20 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD ISOISO 3262-2:1998(E) 1 Extenders for paints Specifications and methods of test Part 2: Barytes (natural barium sulf
15、ate) 1 Scope This part of ISO 3262 specifies requirements and corresponding methods of test for baryte (natural barium sulfate). 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this part of ISO 3262. At the time of pub
16、lication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 3262 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain registers
17、of currently valid International Standards. ISO 787-2:1981, General methods of test for pigments and extenders Part 2: Determination of matter volatile at 105 C. ISO 787-3:1979, General methods of test for pigments and extenders Part 3: Determination of matter soluble in water Hot extraction method.
18、 ISO 787-7:1981, General methods of test for pigments and extenders Part 7: Determination of residue on sieve Water method Manual procedure. ISO 787-9:1981, General methods of test for pigments and extenders Part 9: Determination of pH value of an aqueous suspension. ISO 787-14:1973, General methods
19、 of test for pigments Part 14: Determination of resistivity of aqueous extract. ISO 842:1984, Raw materials for paints and varnishes Sampling. ISO 3262-1:1997, Extenders for paints Specifications and methods of test Part 1: Introduction and general test methods. ISO 3696:1987, Water for analytical l
20、aboratory use Specification and test methods. ISO 4793:1980, Laboratory sintered (fritted) filters Porosity grading, classification and designation. 3 Definition For the purposes of this part of ISO 3262, the following definition applies: 3.1 barytes: Naturally occurring barium sulfate, BaSO4. Copyr
21、ight International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 19:30:20 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3262-2:1998(E) ISO 2 4 Requirements and test met
22、hods For barytes complying with this part of ISO 3262, the essential requirements are specified in table 1 and the conditional requirements are listed in table 2. Table 1 Essential requirements CharacteristicUnitRequirementTest method Grade AGrade B BaSO4 content, min. % (m/m)9080See clause 6 Residu
23、e on 45 m sieve, max. % (m/m)0,5See table 2ISO 787-7 Matter volatile at 105 C, max. % (m/m)0,5ISO 787-2 1) Loss on ignition, max.% (m/m)1See table 2 ISO 3262-1 Matter soluble in water, max. ISO 787-3 pH value of aqueous suspension 6 to 10ISO 787-9 1) By agreement between the interested parties, test
24、 portions other than 10 g may be used. 5 Sampling Take a representative sample of the product to be tested, as described in ISO 842. 6 Determination of BaSO4 content 1) 6.1 General For barytes, the acid-insoluble barium, calculated as barium sulfate, is taken as the BaSO4 content. 6.2 Reagents Use o
25、nly reagents of recognized analytical grade and only water of at least grade 3 purity as defined in ISO 3696. 6.2.1 Hydrochloric acid, concentrated, approximately 37 % (m/m), 1,19 g/ml. 6.2.2 Hydrochloric acid, diluted 1 + 3. Add 1 part by volume of concentrated hydrochloric acid (6.2.1) to 3 parts
26、by volume of water. 6.2.3 Hydrochloric acid, diluted 1 + 100. Add 1 part by volume of concentrated hydrochloric acid (6.2.1) to 100 parts by volume of water. 1) This determination includes strontium sulfate. Copyright International Organization for Standardization Provided by IHS under license with
27、ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 19:30:20 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO ISO 3262-2:1998(E) 3 Table 2 Conditional requirements CharacteristicUnitRequirementTest method Grade AGrade B Residue on 45 m sieve % (
28、m/m)See table 1To be agreed between the interested parties ISO 787-7 Particle size distribution (instrumental method) % (m/m)To be agreed between the interested parties 1) Colour To be agreed between the interested ISO 3262-1 Lightness parties To be agreed between the interested parties 2) Loss on i
29、gnition % (m/m)See table 1 To be agreed between the ISO 3262-1 Matter soluble in water interested parties ISO 787-3 Resistivity of aqueous extract m To be agreed between the interested ISO 787-14 Matter soluble in hydrochloric acid % (m/m) parties See clause 7 1) A general description of a sedimenta
30、tion method using X-ray absorption is given in EN 725-5:1996, Advanced technical ceramics Methods of test for ceramic powders Part 5: Determination of the particle size distribution. 2) Test method in preparation. 6.2.4 Sulfuric acid, diluted 1 + 9. Add 1 part by volume of concentrated sulfuric acid
31、 approximately 96 % (m/m), 1,84 g/ml slowly to 9 parts by volume of water. 6.2.5 Ammonia solution, diluted 1 + 3. Add 1 part by volume of concentrated ammonia solution approximately 32 % (m/m), 0,880 g/ml to 3 parts by volume of water. 6.2.6 Bromine water, saturated solution. 6.2.7 Sodium carbonate
32、solution, 10 g/l. Dissolve 1 g of anhydrous sodium carbonate in 100 ml of water. 6.2.8 Hydroxylammonium chloride solution, 50 g/l. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007
33、 19:30:20 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 3262-2:1998(E) ISO 4 6.2.9 Fusion mixture. Mix equal parts by mass of sodium carbonate and potassium carbonate. 6.3 Apparatus Use ordinary laboratory apparatus and glassware, together with the following: 6.3.1 Pl
34、atinum crucible, with lid. 6.3.2 Sintered-silica filter crucible, pore size index P 16 (pore diameter 10 m to 16 m) as defined in ISO 4793. 6.3.3 Air oven, capable of being maintained at (105 2) C. 6.3.4 Muffle furnace. 6.4 Procedure Weigh, to the nearest 1 mg, approximately 1 g (m0) of the test sam
35、ple, previously dried in accordance with ISO 787-2, into a 400 ml beaker. Add 100 ml of 1 + 100 hydrochloric acid (6.2.3) and allow to stand for 1 h at room temperature, with occasional stirring. Filter through a 125 mm fine-textured ashless filter paper and wash once with 10 ml of hot water. Transf
36、er the filter paper to the platinum crucible (6.3.1), dry and ignite. Add 5 g of the fusion mixture (6.2.9), mix well, and then place a further 1 g of the fusion mixture on top of the mixture in the crucible. Heat the crucible, fitted with its lid, at bright-red heat (800 C to 900 C) for 15 min. The
37、n allow the crucible and lid to cool. Measure 100 ml of hot water into a 600 ml beaker (A) and place into it the crucible and lid. Heat gently for 15 min to extract the melt, then, using clean nickel or other suitable tongs, remove the crucible and lid. Rinse the crucible and lid and tongs with wate
38、r into the beaker. Remove any white residue from the crucible with a rubber-tipped glass stirring rod and rinse again with water. Measure 95 ml of water and 5 ml of concentrated hydrochloric acid (6.2.1) into a second 600 ml beaker (B) and put the crucible and lid into it. Allow the aqueous fusion e
39、xtract in beaker A to settle on a warm surface for 30 min. Decant the hot solution through a 125 mm fine-textured ashless filter paper. Wash the precipitate three times by decantation, using 10 ml portions of hot sodium carbonate solution (6.2.7) and transfer to the filter paper. Repeat the washing
40、three times with 5 ml portions of sodium carbonate solution and discard the washings. Remove the crucible and lid from the acid solution in beaker B and wash down with water into the beaker. Transfer this solution to beaker A, in which the melt was extracted, and add to it the filter paper and resid
41、ue. Cover the beaker with a watch glass, boil for 5 min and then filter through a 125 mm filter paper into beaker B, which originally contained the acid solution. Wash the filter papers thoroughly six times with 10 ml portions of hot water. Transfer the filter papers to the platinum crucible and dry
42、, then ignite at dull-red heat (650 C to 700 C) and add 2 g of the fusion mixture (6.2.9) to the crucible. Heat the crucible and lid at bright-red heat for 15 min. Allow the crucible and lid to cool. Measure 50 ml of hot water into beaker A and place into it the crucible and lid. Heat gently for 15
43、min to extract the melt. Filter through a 125 mm filter paper. Wash twice with 5 ml portions of sodium carbonate solution (6.2.7) and discard the washings. Add to beaker A (which still contains the crucible and lid), 20 ml of 1 + 3 hydrochloric acid (6.2.2) and 50 ml of hot water. Filter this soluti
44、on through the filter paper, and collect the filtrate in beaker B, which contained the original acid extract. Wash six times with 5 ml portions of hot water. Dilute the filtrate with water to approximately 300 ml. Copyright International Organization for Standardization Provided by IHS under license
45、 with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/23/2007 19:30:20 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO ISO 3262-2:1998(E) 5 Boil the solution in beaker B to remove carbon dioxide and then add bromine water (6.2.6) until a yellow col
46、our appears. Add ammonia solution (6.2.5) in slight excess and boil to precipitate the hydroxides of iron, aluminium and manganese. Filter the precipitate on a fast filter paper and wash three times with hot ammonia solution (6.2.5), collecting the filtrate and washings in a 400 ml beaker. Dissolve
47、the precipitate in another beaker with approximately 8 ml of 1 + 3 hydrochloric acid (6.2.2) and 12 ml of water to which a few drops of hydroxylammonium chloride solution (6.2.8) have been added. Dilute this solution to 50 ml, add bromine water (6.2.6) until a yellow colour appears and then add ammo
48、nia solution (6.2.5) in slight excess. Filter and wash the precipitate as described above. Add the first and second filtrates to beaker B and acidify the whole with 1 + 3 hydrochloric acid (6.2.2) against methyl orange, adding approximately 4 ml of acid in excess. Heat the acid extract to boiling. Stir and add slowly 20 ml of hot dilute sulfuric acid (6.2.4). Allow the covered beaker to stand on a warm surface for 3 h. Filter through a sintered-silica