申请人:Clariant Finance (BVI) Limited
公开号:EP0738766A1
公开(公告)日:1996-10-23
Stable, pourable aqueous suspensions of sulphur dyes are provided, especially suspensions which are characterized by a very low content of inorganic sulphides and inorganic polysulphides. The suspensions are produced using certain suspension stabilizing agents consisting mainly of water-soluble polysaccharide gums, such as xanthan gum, whose solutions in water are pseudoplastic. The suspensions may further comprise a non-sulphide reducing agent and/or a dispersing agent. An improved method is also provided for determining the the potential for such suspensions to release hydrogen sulphide upon being acidified at a given temperature, which method comprises acidifying a sample of the suspension to pH 2.9-3.7, capturing all of the hydrogen sulphide released during acidification in aqueous alkali and measuring the sulphide ion content of the aqueous alkali.
本发明提供了稳定、可浇注的硫化染料水悬浮液,特别是无机硫化物和无机多硫化物含量极低的悬浮液。这些悬浮液是使用某些悬浮液稳定剂生产的,这些稳定剂主要由水溶性多糖胶(如黄原胶)组成,它们在水中的溶液是假塑性的。悬浮液还可进一步包含非硫化物还原剂和/或分散剂。该方法包括将悬浮液样品酸化至 pH2.9-3.7,在水碱中捕获酸化过程中释放的所有硫化氢,并测量水碱中的硫离子含量。