A method is provided for stabilizing alkylenebisdithiocarbamates, such as 1,2-ethylenebisdithiocarbamates (EBDC), by mixing the EBDC in the presence of water with a hydroxymethane sulfinate (HMS) which degrades to formaldehyde to reduce the content of ethylenethiourea (ETU) in the EBDC. The HMS and sulfite by-product from the formaldehyde formation also act as reducing agents to inhibit further ETU formation by oxidative decomposition of EBDC. The hydroxymethane sulfinate is preferably added in an amount of about 0.1 to 5 weight percent based upon the EBDC, and the aqueous reaction mixture is then preferably dried under vacuum. Co-polymerization agents, such as hydroquinone or melamine, may also be added to further reduce and inhibit ETU content and formation.
提供了一种稳定亚烷基二
硫代
氨基甲酸酯(如 1,2-亚乙基二
硫代
氨基甲酸酯(EBDC))的方法,将 EBDC 与羟基
甲烷亚
磺酸盐(
HMS)在有
水的情况下混合,后者会降解为
甲醛,从而降低 EBDC 中乙
硫脲(ETU)的含量。
HMS 和
甲醛生成的
亚硫酸盐副产品还可作为还原剂,抑制 EBDC 氧化分解进一步生成 ETU。羟基
甲烷亚硫酸盐的添加量以 EBDC 为基准,最好在 0.1 至 5 重量百分比之间,然后
水性反应混合物最好在真空下干燥。还可加入
对苯二酚或
三聚氰胺等助聚合剂,以进一步减少和抑制 ETU 的含量和形成。