Protection of lyocell against fibrillation. Part 2: Application of 4,6‐(p‐β‐sulphatoethylsulphonyl)anilino‐1,3,5‐triazin‐2(1H)‐one to lyocell by an exhaust process

Abstract

An exhaust application method for 4,6‐(p‐β‐sulphatoethylsulphonyl)anilino‐1,3,5‐triazin‐2(1H)‐one to dried lyocell fibre has been developed. The procedure employs a temperature gradient technique with all of the salt and alkali present at the start. This method gives consistent wet abrasion resistance values with a standard deviation only marginally inferior to Tencel A100. Subsequent dyeing of lyocell fibres, in turn with two reactive dyes, gave build‐up profiles indistinguishable from untreated fibre. The lyocell–agent bonding was stable to high temperature polyester dyeing conditions at pH 6, but unexpectedly showed some instability (as evidenced by a fall in wet abrasion resistance values) when subjected to base‐catalysed reactive dyeing conditions.