ASTM D2245-1990(2005) Standard Test Method for Identification of Oils and Oil Acids in Solvent-Reducible Paints《溶剂可还原的涂料中油类及油酸类鉴定的标准试验方法》.pdf
《ASTM D2245-1990(2005) Standard Test Method for Identification of Oils and Oil Acids in Solvent-Reducible Paints《溶剂可还原的涂料中油类及油酸类鉴定的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D2245-1990(2005) Standard Test Method for Identification of Oils and Oil Acids in Solvent-Reducible Paints《溶剂可还原的涂料中油类及油酸类鉴定的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 2245 90 (Reapproved 2005)Standard Test Method forIdentification of Oils and Oil Acids in Solvent-ReduciblePaints1This standard is issued under the fixed designation D 2245; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revis
2、ion, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the Department of Defense.1. Scope1.1 This test method co
3、vers the identification of oils and oilacids in vehicles that have been separated from solvent-reducible paints. The test method is based on a gas chromato-graphic technique (of the methyl esters) applicable to productscontaining both saturated and unsaturated, animal and veg-etable, unpolymerized o
4、r partially polymerized fatty acidshaving 8 to 20 carbon atoms.1.2 This test method is not applicable to products containingfatty acids that have been polymerized or oxidized to such anextent that no characteristic monomeric fatty acids remain.1.3 This standard does not purport to address all of the
5、safety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2. Referenced Documents2.1 ASTM Standards:2D 1398 Test Method for Fatty
6、 Acid Content of AlkydResins and Alkyd Resin SolutionsD 1983 Test Method for Fatty Acid Composition by Gas-Liquid Chromatography of Methyl EstersD 2372 Practice for Separation of Vehicle from Solvent-Reducible PaintsD 2800 Test Method for Preparation of Methyl Esters fromOils for Determination of Fa
7、tty Acid Composition byGas-Liquid Chromatography3. Summary of Test Method3.1 This test method is based upon the differential migrationand partitioning of constituent fatty acids in the form ofvaporized methyl esters between a flowing gas phase and asupported liquid phase in a gas chromatographic col
8、umn. Thetest method is based on isothermal operation of the gaschromatograph and a hot wire, thermal conductivity detector.3.2 The test method consists in the separation of the vehiclefrom the paint by centrifugation, extraction of fatty acids fromthe vehicle after saponification, conversion of fatt
9、y acids and ameasured addition of margaric acid (internal standard) intomethyl esters, preparation of the gas chromatogram, andinterpretation of the chromatogram. The amount of eachmonomeric fatty acid ester is calculated, totaled, subtractedfrom 100 % to yield polymerized fatty acids, reported as i
10、s, andinterpreted by comparison with standards as being fromspecific oils or oil acids.4. Significance and Use4.1 This test method provides a procedure to identify thefatty acids present in the vehicle of a paint.5. Apparatus5.1 Centrifuge, high-speed, capable of developing in excessof 10 000 g.5.2
11、Separatory Funnels, with PTFE-fluorocarbon stop-cocks.5.3 Gas Chromatograph and Accessories, suitable foranalysis of fatty acids as methyl esters (see Test MethodD 1983).6. Reagent6.1 Hydroquinone.7. Calibration and Standardization7.1 Establish optimum operating conditions on the gaschromatograph wi
12、th known samples of methyl esters as de-scribed in Test Method D 1983.1This test method is under the jurisdiction of ASTM Committee D01 on Paintand Related Coatings, Materials, and Applications and is the direct responsibility ofSubcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
13、Current edition approved Jan. 1, 2005. Published February 2005. Originallyapproved in 1964. Last previous edition approved in 1999 as D 2245 90 (1999).2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStan
14、dards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.7.2 Prepare working standards by running known paints orvehicles through the procedure describe
15、d in Section 8. Includeparticularly compositions with chemical or structural modifi-cations that might be expected to alter the fatty acid distribu-tion or the apparent polymer content of the starting rawmaterials.8. Procedure8.1 Separate the vehicle from the paint by direct high-speedcentrifuging (
16、see Practice D 2372).TABLE 1 Fatty Acid Composition of Oils Used in Paint ProductsACaster Oil, % Oiticica Oil,%Palmitic 2 Palmitic 7Stearic 1 Stearic 5Oleic 7 Oleic 6Ricinoleic 87 Licanic 78Linoleic 3 Hydroxy acids 4Coconut Oil,% Perilla Oil,%Caproic trace Palmitic 7Caprylic 6 Stearic 2Capric 6 Olei
17、c 13Lauric 44 Linoleic 14Myristic 18 Linolenic 64Palmitic 11 Safflower Oil,%Stearic 6 Myristic traceOleic 7 Myristoleic traceLinoleic 2 Palmitic 8Linolenic trace Palmitoleic traceCottonseed Oil,% Stearic 3Capric trace Oleic 13Lauric trace Linoleic 75Myristic 1 Linolenic 1Myristoleic trace Arachidic
18、tracePalmitic 29 Gadoleic tracePalmitoleic 2 Soybean Oil,%Stearic 4 Myristic traceOleic 24 Palmitic 11Linoleic 40 Stearic 4Arachidic trace Oleic 25Linseed Oil,% Linoleic 51Palmitic 6 Linolenic 9Palmitoleic trace Arachidic traceStearic 4 Gadoleic traceOleic 22 Tall Oil,B%Linoleic 16 Palmitic 5Linolen
19、ic 52 Stearic 3Arachidic trace Oleic 46Gadoleic trace Linoleic 41Menhaden Oil,% Linolenic 3Lauric trace Arachidic 2Myristic 7 Tung Oil,%Myristoleic trace Palmitic 4Palmitic 16 Stearic 1Palmitoleic 16 Oleic 8Stearic 2 Linoleic 4Oleic 15 Linolenic 3Linoleic 7 Eleostearic 80Linolenic 2Arachidonic 17Clu
20、panodonic 11Nisinic 4Shibic 1Unidentified unsaturate 2AThe acids and percents presented in this table are taken from the “Composition and Constants of Fatty Acids” chart and used by permission of theArcher-Daniels-Midland Co.BThe percent rosin acids in tall oil may vary from 0 to 42 %, the percent t
21、erpenes from 0 to 13 %. Both variations depend on the grade and refining of the oil.D 2245 90 (2005)28.2 Extract the fatty acids from the separated vehicle aftersaponification and removal of the dicarboxylate salts andunsaponifiable matter in accordance with Test Method D 1398,but substitute separat
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