1、Designation: D 2372 85 (Reapproved 2005)Standard Practice forSeparation of Vehicle From Solvent-Reducible Paints1This standard is issued under the fixed designation D 2372; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year o
2、f 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 practice covers the procedure
3、 for the separation ofthe vehicle from the pigment in solvent-reducible paint.1.2 In the development of the practice the following mate-rials were tested: white soya and white fish oil isophthalicalkyd semi-gloss enamels, white linseed oil paint, white soyaand white linseed o-phthalic alkyd enamels.
4、 It is considered tobe applicable to similar materials.1.3 The values stated in SI units are to be regarded as thestandard. The values given in parentheses are for informationonly.1.4 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is therespo
5、nsibility 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 2371 Test Method for Pigment Content of Solvent-Reducible PaintsD 2698 Test Method for Det
6、ermination of the PigmentContent of Solvent-Reducible Paints by High-Speed Cen-trifuging3. Significance and Use3.1 Separation of the vehicle from the pigment in solvent-reducible paints is required in order to characterize paintvehicles by chemical, spectroscopic, or chromatographic tech-niques. Cha
7、racterization of vehicles is important since theyplay a major role in the performance of coatings.4. Apparatus4.1 Centrifuge, high-speed, capable of developing in excessof 10 000 g.NOTE 1Calculate the gravity developed by the centrifuge as follows:g 5 1.118 3 102 63 r 3 n2(1)where:r = rotating radiu
8、s, mm, andn = rotating speed, r/min.5. ProcedureNOTE 2If the percent of pigment is desired, see Test Method D 2371and Test Method D 2698.5.1 Mix the sample until it is homogeneous, preferably on amechanical shaker.5.2 Centrifuge about 20 mL of the whole paint on ahigh-speed centrifuge in excess of 1
9、0 000 g (Note 1) for 30min or until separation is completed. If difficulty is encoun-tered, add 10 mL of a suitable solvent (Note 3). Mix with thevehicle layer in the centrifuge tube and centrifuge as before.Pour off the supernatant liquid into a bottle and stopper undernitrogen for further use.NOTE
10、 3If quantitative work must be done on the vehicle, the weightof the paint specimen and of the added solvent must be known.6. Keywords6.1 centrifuge; paint vehicle separation; solvent-reduciblepaint1This practice is under the jurisdiction of ASTM Committee D01 on Paint andRelated Coatings, Materials
11、, and Applications and is the direct responsibility ofSubcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.Current edition approved Jan. 1, 2005. Published February 2005. Originallyapproved in 1965. Last previous edition approved in 1999 as D 2372 85 (1999).2For referenced ASTM sta
12、ndards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annual Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken,
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16、iews known to the ASTM Committee on Standards, at the address shown below.This standard is copyrighted by ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959,United States. Individual reprints (single or multiple copies) of this standard may be obtained by contacting ASTM at the aboveaddress or at 610-832-9585 (phone), 610-832-9555 (fax), or serviceastm.org (e-mail); or through the ASTM website(www.astm.org).D 2372 85 (2005)2
