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Cationic dye - History

Cationic dyes are one of the earliest synthetic dyes produced. Aniline violet, synthesized by w.h. perkin in the United States in 1856, and later crystal violet and malachite green, are cationic dyes. These dyes, formerly known as salt dyes, can dye protein fibers and cellulose fibers treated with tannic acid and tartar. They have a bright color, but are not fast to light, and have been replaced by direct dyes, reductive dyes and acid dyes developed later.

After the industrial production of acrylic fiber in the 1950s, it was found that cationic dyes on polyacrylonitrile fibers not only have high directness and bright color, but also have much higher dyeing fastness than those on protein fibers and cellulose fibers, thus arousing people's interest again. In order to further adapt to the application of acrylic fiber and other synthetic fibers, many new varieties with high fastness have been synthesized, such as polymethylmethacrylate structure, nitrogen-substituted polymethylmethacrylate structure and naphthalene lactam structure, etc., thus making cationic dyes become the main dyes for polyacrylonitrile fiber dyeing.

Hangzhou Chungyo Chem Co., Ltd.


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