1、Designation:D237285(Reapproved 2015)Standard Practice forSeparation of Vehicle From Solvent-Reducible Paints1This standard is issued under the fixed designation D2372;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last r
2、evision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This practice covers the procedure for the s
3、eparation 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.It is conside
4、red tobe applicable to similar materials.1.3 The values stated in SI units are to be regarded asstandard.No other units of measurement are included in thisstandard.1.4 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the us
5、er 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:2D2371 Test Method for Pigment Content of Solvent-Reducible PaintsD2698 Test Method for Determination of the Pigm
6、ent Con-tent of Solvent-Reducible Paints by High-Speed Centri-fuging3.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.Characterization of vehicle
7、s 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.NOTE1Calculate the gravity developed by the centrifuge as follows:g 5 1.118310263r 3n2(1)where:r=rotating radius,mm,andn=rotating speed,r/min.5.Pr
8、ocedureNOTE2If the percent of pigment is desired,see Test Method D2371and Test Method D2698.5.1 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 10 000 g(Note 1)for 30min or until separation i
9、s completed.If difficulty isencountered,add 10 mL of a suitable solvent(Note 3).Mixwith the vehicle layer in the centrifuge tube and centrifuge asbefore.Pour off the supernatant liquid into a bottle and stopperunder nitrogen for further use.NOTE3If quantitative work must be done on the vehicle,the w
10、eightof 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,and Applications and is the direct responsibility ofSubcommi
11、ttee D01.21 on Chemical Analysis of Paints and Paint Materials.Current edition approved June 1,2015.Published June 2015.Originallyapproved in 1965.Last previous edition approved in 2010 as D2372 85(2010).DOI:10.1520/D2372-85R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcon
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