• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Colourage >Peroxide stabilisers
【24h】

Peroxide stabilisers

机译：过氧化物稳定剂

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Hydrigen peroxide is available as a 35% solution in water.These solutions are stable in the presence of sulphuric acid or phosphoric acid.Traces of heavy metals such as gold, silver, iron, copper, magnesium etc catalytically decompose hydrogen peroxide. Hydrogen peroxide exerts very little or no action at pH 4.5 to 5.5 and thus requires activation to produce a bleaching effect.The principle means of activation is the alkali addition. Under alkaline conditions, an additive is required for stabilisation of the peroxide which is necessary to avoid undesirable rapid decomposition with the loss of bleaching efficiency and damage to the fibre. During the bleaching operation, there is constant fluctuation in the pH, which has to be controlled with the help of stabilisers. However, activators like acetylated amines, acetylated amides, mixed Anhydrides of acetic acid and inorganic acids like phosphoric acid helps in opening up the peroxide ring, thereby carrying out under weakly alkaline to weakly acidic conditions. T.A E.D{Tetra Acetyl Ethylene Diamine} and D.A.E.D{ Di Acetyl Ethylene Di Amine} are classic examples
机译：过氧化氢以35％的水溶液形式存在，这些溶液在硫酸或磷酸存在下稳定，重金属如金，银，铁，铜，镁等的痕量催化分解过氧化氢。过氧化氢在pH 4.5至5.5时几乎没有或几乎没有作用，因此需要活化才能产生漂白作用。活化的主要手段是添加碱。在碱性条件下，需要一种添加剂来稳定过氧化物，这对于避免不希望的快速分解以及漂白效率的损失和纤维的损坏是必需的。在漂白过程中，pH值不断波动，这必须借助稳定剂来控制。然而，活化剂如乙酰化胺，乙酰化酰胺，乙酸的混合酸酐和无机酸如磷酸有助于打开过氧化物环，从而在弱碱性至弱酸性条件下进行。 T.A E.D {四乙酰基乙二胺}和D.A.E.D {二乙酰基乙二胺}就是经典的例子

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号