Direct dyes had good appetence to cellulose, so fiber was easy to be colored up and had high colorfastness. Especially of lightfast direct dyes had 4-5 degree colorfastness so as to could keep paper color stability. VBK fluorescent agent was obtained from modified VBL.

  • 直接染料对纤维素纤维的亲和力高,纤维易着色,而且色牢度高,特别是耐晒型直接染料的耐晒牢度达到4-5级,能够保证纸面色相的稳定性。

  • 互联网摘选 2025-01-19 23:48:24

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