【英文标准名称】:Plastics-Polyurethanerawmaterials-Aromaticisocyanates-Determinationofacidity
【原文标准名称】:塑料制品.聚氨酯生材料.芳香异氰酸酯.酸度测定
【标准号】:BSISO14898-1999
【标准状态】:作废
【国别】:英国
【发布日期】:1999-11-15
【实施或试行日期】:1999-11-15
【发布单位】:英国标准学会(GB-BSI)
【起草单位】:BSI
【标准类型】:()
【标准水平】:()
【中文主题词】:精密度;塑料;芳烃;试样;抽样方法;试验设备;酸滴定法;原材料;pH值测定;控制样品;容量分析;含量测定;试验条件;试样制备;化学分析和试验;高聚物;再现性;干扰(化学);酸度;聚氨酯;芳族化合物;异氰酸酯
【英文主题词】:Acidcontent;Acidity;Definition;Definitions;Determination;Isocyanates;Plastics;Polyurethane;Testing
【摘要】:ThisInternationalStandardspecifiesmethodsforthemeasurementoftheacidityofaromaticisocyanatesandprepolymersusedaspolyurethanerawmaterials.MethodAisastraightforwardtitrationwithoutablankandisprimarilyapplicabletoproductsderivedfromcrudeormodifiedmethylene-bis-(4-phenylisocyanate),polymethylenepolyphenylisocyanatesandtoluenediisocyanatehavingmoderatetohigh(＞100μg/g)levelsofacidity.MethodBisapplicabletorefined,crudeormodifiedisocyanatesderivedfrommethylene-bis-(4-phenylisocyanate),polymethylenepolyphenylisocyanateandtoluenediisocyanatehavinglow(＜100μg/g)levelsofacidity,andablankisemployed.Thesemethodscanalsobeusedforisomericmixturesoftoluenediisocyanate,methylene-bis-(4-phenylisocyanate)andpolymethylenepolyphenylisocyanate.Otheraromaticisocyanatesmaybeanalysedbythismethodifprecautionsaretakentoverifysuitability.
【中国标准分类号】:G31
【国际标准分类号】:83_040_01
【页数】:14P.;A4
【正文语种】:英语