ANSI/ASTM D5523-1994 聚氨基甲酸乙酯原料试验方法：测定单体、芳香异氰酸酯中的可水解氯的银盐定量测定酸度

标准号：ANSI/ASTM D5523-1994
中文标准名称：聚氨基甲酸乙酯原料试验方法：测定单体、芳香异氰酸酯中的可水解氯的银盐定量测定酸度
英文标准名称：Test Method for Polyurethane Raw Materials: Acidity by Argentometric Determination of Hydrolyzable Chlorine in Monomeric, Aromatic Isocyanates
标准类型：G31
发布日期：1999/12/31 12:00:00
实施日期：1999/12/31 12:00:00
中国标准分类号：G31
国际标准分类号：83.080.20
适用范围： This test method measures the hydrolyzable chlorine content of monomeric, aromatic isocyanates used as polyurethane raw materials and expresses it as HCl acidity. The test method is applicable to toluene diisocyanate (TDI) and monomeric methylene-bis-(4-phenylisocyanate), known as MDI. The main sources of hydrolyzable chlorine and, therefore, acidity in monomeric aromatic isocyanates are carbamyl chlorides, acid chlorides, and dissolved phosgene. All of these compounds react with alcohols and water to form hydrochloric acid. This test method applies only to monomeric isocyanates in which all of the acidity is derived from species that generate HCl on solvolysis. The values stated in SI units are to be regarded as the standard. This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Note 1 -There is no equivalent ISO standard.