ASTM_D_1198_-_93_1998.pdf

Designation:D 1198 93(Reapproved 1998)Standard Test Method forSolvent Tolerance of Amine Resins1This standard is issued under the fixed designation D 1198;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,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.1.Scope1.1 This test method covers the determination of the quan-tity of hydrocarbon solvent that an amine resin will tolerate at77F(25C).1.2 This standard does not purport to address all of thesafety 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:D 362 Specification for Industrial Grade Toluene2D 891 Test Methods for Specific Gravity of Liquid Indus-trial Chemicals33.Summary of Test Method3.1 A standard solvent prepared from three relatively purehydrocarbons is employed to titrate a specimen of the resin toa defined degree of turbidity and the solvent tolerance iscalculated from the volume of solvent added.4.Significance and Use4.1 This test method gives an indication of the solubility ofan amine resin.This property is important in determining theutility of the resin in new paint formulations and in ensuring itscompatibility with existing paint formulations.This testmethod is thus useful for evaluation and quality control ofamine resins.5.Apparatus5.1 Erlenmeyer Flask,wide-mouth,250-mL capacity.5.2 Buret,50-mL capacity,graduated in 0.1-mL divisions.5.3 Print SpecimenA sheet of paper having on it printingin a black ink from 10-point,No.31 old style type,includinga double quotation mark(lower case letters approximately116in.(1.5 mm)high)with normal spacing,upper and lower casewith no italicized or bold letters.6.Reagents6.1 Decahydronaphthalene,(decalin)having a boiling rangebetween 188 and 195C and a density,at 25C,between 0.885and 0.890 g/mL.6.2 Isooctane(2,2,4-trimethylpentane),having a purity of atleast 99 mol%.6.3 Toluene,conforming to Specification D 362.6.4 Solvent Mixture:6.4.1 Blend the above three hydrocarbons in the proportionsindicated below and determine the density at 25C in accor-dance with Test Methods D 891.Parts by WeightIsooctane84Decahydronaphthalene8Toluene86.4.2 Standardize the solvent by titration against 206 0.1 gof mineral-spirits-standardized kauri-butanol solution.The vol-ume of solvent necessary to reach the end point described in7.3 should be between 31 and 32 mL.If the volume of solventis not between 31 and 32 mL make an adjustment by varyingthe concentration of decahydronaphthalene.If the titrant vol-ume is low add more decahydronaphthalene,if high add 84+8isooctane-toluene mixture.Determine the density of the finalmixture at 25C.NOTE1Although similar in certain respects to commercial productsidentified as mineral spirits,the solvent possesses an advantage for thisdetermination in that it is a mixture of known constant composition.7.Procedure7.1 Adjust the temperature of the solvent and the sample to77 6 1F(25 6 0.5C),and conduct the determination at thistemperature.7.2 Weigh the Erlenmeyer flask on a suitable balance to 10mg.Transfer approximately 10 g of resin to the flask and againweigh to 10 mg to obtain the weight of the specimen.7.3 Fill the buret with the solvent,and titrate the specimenwhile swirling the flask constantly.Add the solvent rapidly,butat a rate such that precipitation caused by local excess ofsolvent is kept to a minimum,until about 90%of the requiredamount has been added.As the end point is approached,addthe solvent in small increments.The end point is reached when1This test method is under the jurisdiction of ASTM Committee D-1 on Paintand Related Coatings,Materials,and Applications and is the direct responsibility ofSubcommittee D 01.33 on Polymers and Resins.Current edition approved April 15,1993.Published June 1993.Originallypublished as D 1198 52.Last previous edition D 1198 88.2Discontinued;See 1989 Annual Book of ASTM Standards,Vol 06.03.3Annual Book of ASTM Standards,Vol 15.05.1Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959,United States.the 10-point print placed beneath the flask becomes illegible.Alternatively the end point may be taken as the point where adouble quotation mark can no longer be resolved.Record thevolume of solvent added.8.Calculation8.1 Calculate the solvent tolerance T,expressed as grams ofsolvent tolerated by 100 g of resin,as follows:T 5VD/S!3 100(1)where:V=solvent used in the titration,mL,D=density of solvent,andS=specimen weight used,g.NOTE2If preferred,instead of determining the density of the solventthe flask may be weighed again after completing the titration,thusobtaining directly the weight of solvent required.9.Report9.1 R