《ISO-510-1977.pdf》由会员分享，可在线阅读，更多相关《ISO-510-1977.pdf（6页珍藏版）》请在三一文库上搜索。
1、INTERNATIONAL STANDARD 510 ,NTERNAT,ONAL ORGANlZATlON FOR STANDARDIZATION .MEYIlYHAPOilHAR OPrAHMJAUMI n0 CTAHLIAPTH3AIIAH.ORGANISATION INTERNATIONALE DE NORMALlSATlON Red lead for paints Minium pour pein tures First edition - 1977-04-15 APR f 9 1977 .RNS1 Internat Dot Sect UDC 667.622.115.13 Ref. N
2、o. IS0 510-1977 (E) Descriptors : paints, pigments, red lead, specifications, physical properties, chemical composition, chemical analysis, physical tests. Price based on 4 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical S
3、tandards 1/9972545001 Not for Resale, 04/28/2007 01:46:55 MDTNo reproduction or networking permitted without license from IHS -,-,- FOREWORD IS0 (the international Organization for Standardization)-is a worldwide federation of national standards institutes (IS0 member bodies). The work of developing
4、 International Standards is carried out through IS0 technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO,
5、also take part in the work. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the IS0 Council. International Standard IS0 510 was drawn up by Technical Committee ISO/TC 35, Paints a
6、nd varnishes, and was circulated to the member bodies in December 1974. It has been approved by the member bodies of the following countries : Australia Iran Austria Ireland Brazil Italy Bulgaria Netherlands Egypt, Arab Rep. of New Zealand France Poland Germany Portugal India Romania South Africa, R
7、ep. of Spain Sweden Switzerland Turkey Yugoslavia The member body of the following country expressed disapproval of the document on technical grounds : United Kingdom This International Standard cancels and replaces IS0 Recommendation R 510-1966, of which it constitutes a technical revision. 0 Inter
8、national Organization for Standardization, 1977 l Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 01:46:55 MDTNo reproduction or networking permitted witho
9、ut license from IHS -,-,- INTERNATIONAL STANDARD IS0 510-1977 (E) Red lead for paints 1 SCOPE AND FIELD OF APPLICATION This International Standard specifies the requirements and corresponding test methods for two types of red lead pigment, suitable for use in paints. 2 REFERENCES ISO/R 150, Raw, ref
10、ined and boiled linseed oil. IS0 787, General methods of test for pigments. IS0 842, Raw materials for paints and varnishes - Sampling. 3 DEFINITIONS 3.1 red lead : A red to orange-red pigment which consists of lead orthoplumbate (Pba04) and lead monoxide (PbO) and in which no impurities other than
11、those arising from normal manufacturing processes are present. 3.2 non-setting red lead; high-percentage red lead : Red lead which, when mixed with linseed oil, does not cause undue thickening. 4 REQUIRED CHARACTERISTICS AND THEIR TOLERANCES Red lead shall have the characteristics shown in the table
12、. 5 SAMPLING A representative sample of the pigment shall be taken in accordance with IS0 842. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 01:46:55 MDTNo reproduction or ne
13、tworking permitted without license from IHS -,-,- IS0 510-1977 (E) TABLE - Required characteristics and their tolerances* Requirement according to type Characteristic Lead dioxide Lead orthoplumbate Sum of lead orthoplumbate and free lead monoxide Matter volatile at 105 “C Non-setting red lead (High
14、-per- High-dispersive Test method centage red lead) red lead % (m/m) min. 32.5 min. 33,5 Clause 6 % (m/m) min. 93.2 min. 96,0 Clause 8 % (m/m) min. 99 min. 99 Clause 8 % (m/m) max. 0,2 max. 0,2 IS0 787, Part I I Matter soluble in water % (m/m) max. 0.3 max. 0.3 IS0 787, Part I I I Residue on sieve (
15、63 pm)* % (m/m) max. 0.75 max. 0,3 IS0 787, Part VI or VI I Oil absorption value Sedimentation volume* ml To be agreed between the interested parties I *xx min. 30 * IS0 787, Part V Clause 9 Non-setting properties After exposure in air for 14 days, the mixture described in clause 10 shall, after sti
16、rring, still be in a condition suitable for application by brush Clause 10 l All percentages are calculated on the original sample. l * TWO alternative methods for determination of residue on sieve are specified in IS0 787, identified respectively as the “oil method” and the “water method”. Both met
17、hods are acceptable for the purpose of this lnt it shall in any case be mentioned in the test report. * * High-percentage red lead differs from high-dispersive red lead by, among other factors, having a lower sedimentation volume. METHODS OF TEST During the analysis, use only reagents of recognized
18、analytical grade, and only distilled water or water of equivalent purity. 6 DETERMINATION OF LEAD DIOXIDE (PbO,) CONTENT 6.1 Reagents iodide with about 30 ml of water to obtain a homogeneous suspension. Pour it into 1 I of boiling water. Boil the solution for 3 min and allow to cool. 6.1.1 Sodium th
19、iosulphate, 0,l N solution. 6.2 Procedure 6.1.2 Acetic acid, 300 g/l solution. 6.1.3 Sodium acetate, 600 g/l solution. Dissolve 600 g of sodium acetate trihydrate (C,H,O,Na.3H,O) in water and make up to 1 I. 6.1.4 Iodine, 0,l N standard volumetric solution. 6.1.5 Starch indicator solution. Shake 10
20、g of soluble starch and 10 mg of mercury(ll) 2 6.2.1 Determination Weigh, to the nearest 1 mg, 0,5 to 0,8 g of the laboratory sample and transfer to a 250 ml conical flask. Add successively the following reagents : 25 ml of the sodium thiosulphate solution (6.1.1). accurately measured with a pipette
21、, 25 ml of the sodium acetate solution (6.1.3), 20 ml of the acetic acid solution (6.1.2). Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 01:46:55 MDTNo reproduction or networki
22、ng permitted without license from IHS -,-,- IS0 510-1977(E) Stir gently to dissolve the test portion. Rub down coarse particles of the pigment by means of a glass rod flattened at the end (after this, carefully rinse the rod). If the last traces of the pigment are difficult to dissolve, the addition
23、 of not more than 0,5 g of potassium iodide is recommended. When the lead oxides are completely dissolved (except of course insoluble constituents, such as metallic lead particles, etc.), titrate the excess sodium thiosulphate with the standard volumetric iodine solution (6.1.4), using the starch so
24、lution (6.1.5) as indicator. 6.2.2 Blank test In parallel with the determination, carry out a blank test following the same procedure and using the same quantities of all the reagents, but omitting the test portion. 6.3 Expression of results The lead dioxide content, a, expressed as a percentage by
25、mass of PbO, is given by the formula a=0,1196x100x iv,-V,) T ml II,96 (V,- V,) T ml where VI is the volume, in millilitres, of the standard volumetric iodine solution (6.1.4) used for the determination; V2 is the volume, in millilitres, of the standard volumetric iodine solution (6.1.4) used for the
26、 blank test; T is the exact normality, in moles of H+ per litre, of the standard volumetric iodine solution (6.1.4); ml is the mass, in grams, of the test portion; 0,119 6 is the number of milligrams of lead dioxide equivalent to 1 ml of 1 N iodine solution. 7 DETERMINATION OF TOTAL LEAD CONTENT BY
27、THE SULPHATE METHOD ) 7.1 Reagents 7.1.1 Hydrogen sulphide. 7.1.2 Hydrochloric acid, 3 M. 7.1.3 Nitric acid, 4 M. 7.1.4 7.1.5 7.1.6 7.1.7 7.1.8 7.1.9 Nitric acid, 4 M, saturated with bromine. Sulphuric acid, 500 g/l solution. Potassium hydroxide, 100 g/l solution. Ammonium acetate, 335 g/l solution.
28、 Sodium sulphide, 100 g/l solution. Ethanol or denatured spirit, approximately 95 % (V/V). 7.1.10 Hydrogen peroxide, 30 g/l solution, free from sulphuric acid. 7.2 Procedure 7.2.1 Weigh, to the nearest 1 mg, 0,5 g of the laboratory sample and transfer it to a beaker of 400 ml nominal capacity. Add 1
29、0 ml of the nitric acid (7.1.3) and add the hydrogen peroxide solution (7.1.10), drop by drop while heating gently, until all the red lead has dissolved. Cover the beaker, boil the solution gently for 5 min to decompose any excess hydrogen peroxide and rinse the cover. NOTE - Should the red lead be
30、found to contain impurities, treat the contents of the beaker as follows : Filter off any remaining material insoluble in nitric acid and wash the filter with hot water until free from soluble lead. Evaporate the filtrate to dryness. Add 2 ml of the hydrochloric acid (7.1.2). stir to mix and again e
31、vaporate to dryness on a water bath. Repeat this operation once more. Add a further 2 ml of the hydrochloric acid, followed by 200 ml of water. Boil the contents of the beaker to dissolve the lead chloride and pass in hydrogen sulphide (7.1.1). until cold. Filter the precipitate of lead sulphide on
32、paper and wash with a saturated solution of hydrogen sulphide. If antimony is present, wash the bulk of the precipitate back into the beaker and digest with 10 ml of the potassium hydroxide solution (7.1.6) and 10 ml of the sodium sulphide solution (7.16) for 10 min without boiling. Again filter the
33、 lead sulphide onto the same paper and wash with the sodium sulphide solution diluted with 10 times its volume of water. Pierce the paper with a pointed glass rod and wash as much as possible of the lead sulphide down into the original beaker. Then dissolve the remaining lead sulphide from the paper
34、 with the nitric acid saturated with bromine (7.1.4) and warm the beaker to dissolve all the lead sulphide. 7.2.2 Add 20 ml of the sulphuric acid (7.1.5) to the solution and then evaporate gently without boiling, until copious fumes are evolved. Cool to room temperature, carefully add 100 ml of wate
35、r followed by 100 ml of the ethanol (7.1.9) and allow to stand for 2 h. 1) This method should be used as the referee method. By agreement between the interested parties, other methods such as the chromate method specified in IS0 511, W/rife lead for paints, or an EDTA method may be used. 3 Copyright
36、 International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 01:46:55 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 510-1977 (E) Transfer the precipitate to a weighed G
37、ooch crucible packed with asbestos, or to a sintered silica crucible of porosity grade P16, i.e. pore size index 10 to 16 pm, and wash with ethanol (7.1.9). Heat the crucible, gently at first and then to 500 “C for 10 min, cool and weigh. Pour hot ammonium acetate solution (7.1.7) onto the filter to
38、 extract the lead sulphate completely. Wash the residue with hot water, dry, heat to 500 “C for 10 min, cool and reweigh. The difference between these two weighings is the mass of lead sulphate. 7.3 Expression of results The total lead content, 6, expressed as a percentage by mass of Pb, is given by
39、 the formula b= 0,683 2 (m5 - me) x 100 = 68.32 (ma -meI m4 m4 where m4 is the mass, in grams, of the test portion; m5 is the mass, in grams, of the first precipitate; m6 is the mass, in grams, of the residue after extraction with ammonium acetate; 0,683 2 is the factor for the conversion of lead su
40、lphate to lead. 8 CALCULATION OF LEAD ORTHOPLUMBATE CONTENT AND OF SUM OF FREE LEAD MONOXIDE AND LEAD ORTHOPLUMBATE CONTENTS The lead orthoplumbate content, c, expressed as a percent- age by mass of PbaO, is given by the formula c = 2,866 a The sum of the free lead monoxide (PbO) and the lead orthop
41、lumbate (Pba04) contents, expressed as a percentage by mass, is given by the formula 1,077 (b - 2,599 a) + c where a is the lead dioxide content, expressed as a percentage by mass, determined by the method specified in clause 6; b is the total lead content, expressed as a percentage by mass, determi
42、ned by the method specified in clause 7. 9 DETERMINATION OF THE SEDIMENTATION VOLUME 9.1 Reagent Ethanol, 95 % (V/V), pzo 0,811 4 g/ml, not denatured. 9.2 Apparatus Glass-stoppered graduated cylinder, of capacity 50 ml, internal height to 50 ml graduation line 150 k 3 mm. 9.3 Procedure Weigh 50 + 0,
43、l g of the laboratory sample into the cylinder (9.2), add 35 ml of the ethanol (9.1), and shake the mixture for exactly 15 min. After this period, make up to the 50 ml mark with the ethanol. Allow to stand for 24 h at ambient temperature. After 24 h, read the sedimentation volume to the nearest mill
44、ilitre. 10 DETERMINATION OF NON-SETTING PROPERTIES 10.1 Reagent Linseed oil, acid-refined, of acid value between 4 and 5 mg of KOH/g, complying with ISO/R 150. 10.2 Apparatus Cylindrical tin, of capacity approximately 150 ml and diameter approximately 65 mm. 10.3 Procedure Prepare at least 150 ml of
45、 paint by thoroughly grinding sufficient of the laboratory sample in the linseed oil, (10.1) to form a paste containing 8 to 10 % (m/m) of oil, and further thinning the paste with the same oil to paint consistency. Pour the paint into the tin so that it is filled to within approximately 12 mm of the
46、 top. Without placing a lid on the tin, leave the paint exposed to the air for 14 days at ambient temperature. At the end of this period, stir the paint and note whether it has thickened unduly. Apply the stirred paint to a non- absorbent surface and note whether it is still suitable for application
47、 by brush. 11 TEST REPORT The test report shall contain at least the following information : a) a reference to this International Standard or to a corresponding national standard; b) the type and identification of the product tested; c) the results of the tests and whether or not the product tested
48、complies with the relevant specification limits; d) any deviation, by agreement or otherwise, from the procedure specified; e) the date of the tests. 4 , Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/28/2007 01:46:55 MDTNo reproduction or networking permitted without license from IHS -,-,-