1、Designation:D 1950 86(Reapproved 1995)e1Standard Test Method forAcetone Tolerance of Heat-Bodied Drying Oils1This standard is issued under the fixed designation D 1950;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last
2、revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon(e)indicates an editorial change since the last revision or reapproval.e1NOTEUnit of measurement statement and Keywords were added editorially in May 1995.1.Scope1.1 This test method covers the determination o
3、f the acetonetolerance of heat-bodied drying oils when no nonfatty materialis present.1.2 The values stated in SI units are to be regarded as thestandard.The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns,if any,associated
4、with its use.It is theresponsibility of whoever uses this standard to consult andestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.Specific hazard statements are given in Section 6.2.Terminology2.1 Definitions of Terms Specific
5、to This Standard:2.1.1 acetone toleranceof a drying oil,the number ofgrams of acetone required to produce a persistent cloudiness in100 g of the oil at 25C,under the conditions prescribed in thistest method.3.Significance and Use3.1 Unbodied drying oils are miscible with acetone.Asdrying oils are he
6、at-bodied,higher molecular weight speciesare formed that are acetone insoluble.Therefore,addition ofacetone to a drying oil can be used as an indication of thedegree of polymerization present in the oil.Since solubility ofa polymer is extremely temperature-dependent,the tempera-ture must be precisel
7、y controlled.This test method is appli-cable to heat-bodied oils only when no other nonfatty materialis present.3.2 There is no correlation between the acetone toleranceand the usefulness of an oil,but,if acetone tolerance and otherproperties of an oil are the same as those of an acceptedsample,the
8、two probably have been produced by the sametechnique.4.Apparatus4.1 Balance,capable of weighing to an accuracy of 0.5 mg.4.2 Erlenmeyer Flasks,250-mL,glass-stoppered.4.3 Bath Clamp.4.4 Ringstand,approximately 4 ft(1.2 m)high.4.5 Buret,with a capacity of 50 mL,fitted at the top with asuitable drying
9、tube.4.6 Water Jacket Assembly for Buret,as shown in Fig.1.4.7 Water BathAconstant-temperature water bath capableof maintaining a temperature of 25 6 0.1C.The bath shall befitted with a water pump for circulating water through the bathand the water jacket as shown in Fig.1.NOTE1Details for the therm
10、ostatic control unit and heating elementhave been omitted from the drawing in Fig.1,since the proper selectionand construction of this unit may be left to the discretion of the analyst.4.8 Volumetric Flask,25-mL,glass-stoppered,for use as aspecific gravity bottle.4.9 Glass Beads,approximately 1.5 to
11、 3 mm(116to18in.)in diameter.5.Reagents and Materials5.1 Acetone(WarningSee 6.1):5.1.1 Place a suitable quantity of acetone in a round-bottom,glass-stoppered flask and to it add 25%of its weight ofanydrous cupric sulfate(CuSO4).Stopper the flask and allowthe mixture to stand for at least 3 days.At t
12、he end of thisperiod,attach the flask and its contents to an all-glass distilla-tion apparatus that previously has been thoroughly dried anddistill the acetone directly from the drying agent,using a steambath for heating.Discard the first 10%and the last 10%of thedistillate.During the distillation,p
13、rotect the apparatus fromatmospheric moisture by means of a trap containing anydrousCuSO4.Collect and store the acetone in the same receivingbottle,fitted with a similar moisture trap.5.1.2 Determine the specific gravity at 25/25C and thepercent of moisture in the acetone.The acetone shall beconside
14、red suitable for use if the specific gravity is between1This test method is under the jurisdiction of ASTM Committee D-1 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D01.32 on Drying Oils.Current edition approved March 27,1986.Published May
15、1986.Originallypublished as Sections 4347 of Test Method D 555 58.Last previous editionD 1950 68(1984).1AMERICAN SOCIETY FOR TESTING AND MATERIALS100 Barr Harbor Dr.,West Conshohocken,PA 19428Reprinted from the Annual Book of ASTM Standards.Copyright ASTM0.7864 and 0.7872,equivalent to a water conte
16、nt of 0.00 to0.24%.5.2 Cupric Sulfate,AnhydrousTechnical grade,anhy-drous,powdered cupric sulfate(CuSO4).6.Hazards6.1 Acetone is a flammable liquid.It is harmful if inhaled,use only with adequate ventilation.Avoid prolonged contactwith skin or any contact with the eyes.See suppliers MaterialSafety Data Sheet.7.Procedure7.1 Weigh the glass-stoppered Erlenmeyer flask,containingthree or four glass beads,to 0.1 mg.Transfer about 30 g of thesample of the Erlenmeyer flask and weigh the flask andconten
