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【英文标准名称】:StandardTestMethodforPolyurethaneRawMaterialsAciditybyArgentometricDeterminationofHydrolyzableChlorineinMonomeric,AromaticIsocyanates
【原文标准名称】:单体芳香异氰酸酯中水解氯银量滴定法测定聚氨酯原料酸度的标准试验方法
【标准号】:ASTMD5523-2010
【标准状态】:现行
【国别】:美国
【发布日期】:2010
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D20.22
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:
【英文主题词】:acidity;HC;hydrolyzablechlorine;isocyanates;isocyanatesaromatic;MDI;methylene-bis-(4-phenylisocyanate);methylenedi(phenylisocyanate);polyurethane;rawmaterials;TDI;testmethod;titration;toluenediisocyanate;Acidity,alkalinity,
【摘要】:ThistestmethodissuitableforresearchorforqualitycontroltocharacterizeTDIandMDI.Thistestmethodwasdevelopedtoovercomeproblemswithlow-levelaciditydeterminationsthatuseglasselectrodesinthepresenceofreagentalcoholsolvents.Reagentalcoholscontainacidicandbasicspecies,whichcomplicatetheglasselectrodemethodsatlowlevelsofacidity.1.1Thistestmethodmeasuresthehydrolyzablechlorinecontentofmonomeric,aromaticisocyanatesusedaspolyurethanerawmaterialsandexpressesitasHClacidity.Thetestmethodisapplicabletotoluenediisocyanate(TDI)andmonomericmethylenedi(phenylisocyanate),knownasMDI.Themainsourcesofhydrolyzablechlorineand,therefore,acidityinmonomericaromaticisocyanatesarecarbamylchlorides,acidchlorides,anddissolvedphosgene.Allofthesecompoundsreactwithalcoholsandwatertoformhydrochloricacid.1.2ThistestmethodappliesonlytomonomericisocyanatesinwhichalloftheacidityisderivedfromspeciesthatgenerateHClonsolvolysis.1.3ThevaluesstatedinSIunitsaretoberegardedasthestandard.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.Note18212;ThereisnoknownISOequivalenttothisstandard.
【中国标准分类号】:G31
【国际标准分类号】:83_080_20
【页数】:3P.;A4
【正文语种】:英语