Study of dyeing properties of hemp fabric by trapa acornis nakano shell dyes
To explore the dyeing process problem of hemp fiber with trapa acornis nakano shell pigment,cationic modifiers KR,chitosan,gelatin,and BS modifiers were used to modify hemp,and unmodified and modified hemp were dyed with the dye.The influence of modifiers on the direct dyeing effect of trapa acornis nakano shell dye was discussed.The effects of mordant tannic acid,alum,plant ash and citric acid on the dyeing of unmodified hemp and modified hemp fabric with trapa acornis nakano shell dye were studied.The results show that the fabric dyed with trapa acornis nakano shell dye has a certain UV absorption function and the maximum wavelength in visible light is 380 nm,corresponding to an absorbance of 0.067 K/S value of BS modified direct dyeing method,unmodified Hanma alum post mordant method,water-soluble chitosan modified Hanma alum post mordant dyeing method,gelatin modified Hanma alum post mordant dyeing method,BS modified Hanma grass and wood ash one bath mordant dyeing method and BS modified Hanma alum post mordant methods are all above 3.990,their dyeing fastnesses are all at level 3 or above.Except for the BS modified direct dyeing process,which has a wet friction fastness of level 3,all other processes have a color fastness of level 3-4 or above,with the highest light fastness reaching level 5.
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