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1、INTERNATIONAL STANDARD IS0 8623 First edition 1997-02-l 5 Tall-oil fatty acids for paints and varnishes - Specifications and test methods Aides gras d huile de tall pour peintures et vernis - Spkcifications et nkthodes d essai Reference number IS0 8623: 1997(E) Copyright International Organization f
2、or Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:16:38 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8623: 1997(E) Foreword IS0 (the International Organization for Standardization) i
3、s a worldwide federation of national standards bodies (IS0 member bodies). The work of preparing International Standards is normally carried out through IS0 technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represe
4、nted on that committee. International organizations, governmental and non- governmental, in liaison with ISO, also take part in the work. IS0 collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Draft International Standard
5、s 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. International Standard IS0 8623 was prepared by Technical Committee lSO/TC 35, Paints and varnishes.
6、Annex A of this International Standard is for information only. 0 IS0 1997 All rights reserved. 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 wri
7、ting from the publisher. International Organization for Standardization Case postale 56 l CH-1211 Geneve 20 l Switzerland Internet: centraliso.ch x.400: c=ch; a=400net; p=iso; o=isocs; s=central Printed in Switzerland ii Copyright International Organization for Standardization Provided by IHS under
8、license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:16:38 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD 0 IS0 IS0 8623: 1997(E) Tall-oil fatty acids for paints and varnishes - Specifications and test methods
9、 1 Scope This International Standard specifies the requirements and the corres- ponding test methods for distilled tall-oil fatty acids for paints and varnishes. 2 Normative references The following standard contains provisions which, through reference in this text, constitute provisions of this Int
10、ernational Standard. At the time of publication, the edition indicated was valid. All standards are subject to revision, and parties to agreements based on this Internatio- nal Standard are encouraged to investigate the possibility of applying the most recent ecition of the standard indicated below.
11、 Members of IEC and IS0 maintain registers of currently valid International Standards. IS0 150:1980, Raw, refined and boiled linseed oil for paints and varnis- hes - Specifications and methods of test. IS0 383:1976, Laboratory glassware - Interchangeable conical ground joints. IS0 842:1984, Raw mkte
12、ri$ls for paints And varnishes - Sampling. IS0 2811:1974, Paints and varnishes - Determination of density. IS0 3681:1983, Binders for paints and varnishes - Determination of saponification value - Titrimetric method. IS0 3682:1983, Binders for paints and varnishes - Determination of acid value - Tit
13、rimetric method. IS0 3696:1987, Water for laboratory use - Specification and test methods. IS0 3961:1989, Animal and vegetable oils and fats - Determination of iodine value IS0 4630:1981, Binders for paints and varnishes - Estimation of colour of clear liquids by the Gardner colour scale 3 Requireme
14、nts and test methods Tall-oil fatty acids shall comply with the requirements given in table 1. 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:16:38 MDTNo reproduction or ne
15、tworking permitted without license from IHS -,-,- IS0 8623: 1997(E) 0 IS0 Table 1 - Requirements and test methods Property Requirement Test method at 20 C g/ml 0,900 to 0,910 Density IS0 2811 at 23 C! g/ml 0,898 to 0,908 Colour Acid value Saponification mg KOH/g w KOH/g max. 5 min. 192 min. 193 IS0
16、4630 (Gardner scale) IS0 3682 IS0 3681 Iodine value g Iodine/I00 g min. 125 IS0 3961 (Wijs method) Unsaponifiable matter Rosin acid content 0 (m/m) max. 2,5 IS0 150, Annex % (m/m) max. 2,5 Clause 4 4 Determination of rosin acid content 4.1 Principle A test portion is treated with butanol sulfuric ac
17、id esterification reagent under specified conditions and subsequently titrated against a standard volumetric potassium hydroxide solution, using phenolphthalein as indicator. The rosin acid content is calculated in terms of abietic acid. 4.2 Reasents During the analysis, use only reagents of recogni
18、zed analytical grade and only water of at least grade 3 purity as defined in IS0 3696. 4.2.1 Butanol Sulfuric acid esterification reagent Introduce 500 ml of n-butanol, 500 ml of toluene and 3,3 ml of concen- trated sulfuric acid, p = 1,84 g/ml, into a 2 1 round-bottom flask with ground-glass neck,
19、connect to a moisture trap and condenser, and reflux on a hotplate for 30 min to distil of the water. Cool and store in a glass-stoppered bottle. 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for R
20、esale, 04/24/2007 23:16:38 MDTNo reproduction or networking permitted without license from IHS -,-,- 0 IS0 IS0 8623: 1997(E) 4.2.2 Potassium hydroxide, standard volumetric methanolic solution, c (KOH) = 0,2 mol/l. Dissolve 13,3 g of KOH pellets in 1 1 of methanol. Standardize against a potassium hyd
21、rogen phthalate primary standard. 4.2.3 Phenolphthalein, indicator solution, 10 g/l in 95 % (V/V) ethanol. 4.3 Apparatus Ordinary laboratory apparatus and glassware, together with the following: 4.3.1 Air condenser, 760 mm long, with a 24/29 ground glass cone. 4.3.2 Burette, automatic type, having a
22、 capacity of 25 ml, for the stand- ard potassium hydroxide solution, fitted with soda lime traps to protect against absorption of atmospheric CO,. 4.3.3 Conical flask, of borosilicate glass, of capacity 250 ml, with a 24/29 conical ground glass neck. 4.3.4 24/29 Conical ground glass joints, complyin
23、g with the requirements of IS0 383. 4.3.5 Moisture trap, of construction similar to that shown in figure 1 and wrapped with 12,5 mm heat resistant-tape. 4.3.6 Pipette, automatic, of capacity 50 ml. 3 Copyright International Organization for Standardization Provided by IHS under license with ISO Lice
24、nsee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:16:38 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8623: 1997(E) IS0 _-_ Dimensions in millimeters m +I z m IYl - II 7-p I 2.H I i 422 I Figure 1 - Moisture trap _- 4.4 Sampling Take a represent
25、ative sample of the fatty acid, as described in IS0 842. 4.5 Procedure Carry out the determination in duplicate. Weigh to the nearest 1 mg, 5 g to 8 g of the sample and transfer to a 250 ml conical flask (4.3.3). Using the automatic pipette (4.3.61, measure 50 ml of the esterification reagent (4.2.1
26、) into the flask. Connect the flask to the moisture trap (4.3.5) and condenser (4.3.11, place on a hotplate, heat to boiling, and reflux for 20 min. 4 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not fo
27、r Resale, 04/24/2007 23:16:38 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8623: 1997(E) At the end of the heating period, remove the flask from the hotplate and allow to cool to room temperature. Add 0,s ml of the phenolphthalein solution (4.2.3) and titrate with th
28、e standard volumetric potassium hydroxide solution (4.2.2) until the solution turns pink-red. Note 1 - In the case of dark-coloured products or those containing small amounts of mineral acid or alkali, the end-point of the titration should preferably be determined potentiometrically. Carry out a bla
29、nk test, also using 50 ml of the esterification reagent. 4.6 Expression of results Calculate the rosin acids content C!, expressed as a percentage by mass, using the following equation: c = (VI-V.) x c x 302,4 x 1,042 R m x 10 - 0,l v, is the volume, in millilitres, of the standard volume- tric pota
30、ssium hydroxide solution (4.2.2) used for the determination; V2 is the volume, in millilitres, of the standard volume- tric potassium hydroxide solution (4.2.2) used for the blank test; C is the concentration, in mol/l, of the potassium hy- droxide solution (4.2.2) ; m is the mass, in grams, of the
31、test portion; 302,4 is the molecular mass of abietic acid; 1,042 is an experimentally determined factor to correct for the slight esterification of rosin acids; or1 is an experimentally determined factor to correct for unesterified acids. If the two results (duplicates) differ by more than the value
32、 indicated in 4.7, repeat the procedure. Calculate the mean of two valid results (replicates) and report the result to one decimal place. 5 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 0
33、4/24/2007 23:16:38 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8623:1997(E) 4.7 Repeatabilitv The value below which the absolute difference between two single test results, each the mean of duplicates, obtained on identical material by one operator in one laboratory
34、 within a short interval of time using the standardized test method, may be expected to lie with a 95% probability is 0,2% (m/m). 5 Test report The test report shall contain at least the following information: a) b) cl d) e) f) all details necessary for the identification of the product tested; a re
35、ference to this International Standard (IS0 8623); the results of the tests and whether or not the product complies with the relevant specification limits; any unusual features noted during the determination; any deviation from the test methods specified or regarded as optional; the date of the test
36、s. 6 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:16:38 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 IS0 8623:1997(E) Annex A (informative)
37、 Bibliography II IS0 5508:1990, Animal and vegetable fats and oils - Analysis by gas- liquid chromatography of methyl esters of fatty acids. 7 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale
38、, 04/24/2007 23:16:38 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 8623:1997(E) ICS 87.060.99 Descriptors: paints, varnishes, binders (materials), oils, vegetable oils, fatty acids, classification, specifications, tests. Price based on 7 pages Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/24/2007 23:16:38 MDTNo reproduction or networking permitted without license from IHS -,-,-