【英文标准名称】:Plastics-Aromaticisocyanatesforuseintheproductionofpolyurethane-Determinationofacidity
【原文标准名称】:塑料聚氨酯生产用芳香异氰酸酯酸度测定
【标准号】:ISO14898-1999
【标准状态】:现行
【国别】:国际
【发布日期】:1999-10
【实施或试行日期】:
【发布单位】:国际标准化组织(IX-ISO)
【起草单位】:ISO/TC61
【标准类型】:()
【标准水平】:()
【中文主题词】:聚氨酯;试验;定义;定义;塑料;酸度;测定;异氰酸酯;酸含量
【英文主题词】:Acidcontent;Acidity;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】:7P;A4
【正文语种】:英语


Product Code:SAE AS3486
Title:Nut, Self-Locking, Extended Double Hexagon, Reduced Flange, Dry Film Lube, UNS S66286, Class: 160 ksi/800 掳F
Issuing Committee:E-25 General Standards For Aerospace And Propulsion Systems
Scope:No scope available.