Improvement of Wash Fastness and Light Fastness of Reactive Dyes Applied to Silk Using a Syntan in Conjunction with Complexing Agents and Different Enzymes

Silk yarn was dyed using three commercial reactive dyes. An aftertreatment with a commercial syntan wasapplied to dyeings and the aftertreated dyeings were further treated with metal salts and different enzymes in anattempt to improve wash fastness properties still further. Untreated, syntanned and syntanned/backtannedspecimens were subjected five times according to ISO CO6 wash tests. The fastness, to repeated wash testing, ofsilk which had been dyed with the three dyes was improved. However, aftertreatment of the dyeing using tannicacid/enzymes system showed greatest wash fastness improvement toward wash testing. Further, significant ,improvement in wash fastness was secured by the subsequent treatment of the syntanned fibre with the metalsalts. Also, the dyed samples (untreated /treated) were washed according to ISO CO1 wash tests (Grey scalesystem for assessing change in colour and staining), it was found that the aftertreatments provided animprovement on change in colour and staining. In addition to, reduction in strength (K/S) due to loss of dyeduring the wash fastness test were determined. The corresponding colorimetric data revealed that aftertreatedwith complexing agents and different enzymes improved wash fastness to some extent. Also , light fastness wasmeasured , according to ISO BO2 light test, it was found that complex agent aftertreatments have very smalleffective on light fastness of reactive dyeings

کلیدواژه ها:

Silk ، Syntan ، Wash Fastness ، Light Fastness ، Aftertreatment ، Reactive dyes.