Preparation and properties of bio-based PA 56/PET blend fibers and composite yarns thereof
Using bio-based polyamide 56(PA 56)and polyethylene terephthalate(PET)as raw materials,PA 56/PET blend fibers and PA 56/PET composite blend fiber yarns were separately prepared by blend spinning and blend interlacing.The fiber forming performance,mechanical properties and dyeing behavior of PA 56/PET blend fibers with different PA 56 contents were studied,as well as the dyeing effect and fabric style of PA 56/PET composite blend fiber fabric at different interlacing pressures.The results showed that PA 56/PET blend fibers had good mechanical properties and dyeing behavior,including a breaking strength of 4.2 cN/dtex,an elongation at break of 25%and a yarn unevenness of 0.96%,when PA 56 was added into PET at a mass fraction of 20%,and the dyeing uniformity of the blend fiber fabric dyed with dispersed dyestuffs reached the Grey Card standard of 5.0 level,and the dyeing depth was higher than that of pure PET fiber fabrics;PET fiber and PA 56 fiber could be well mixed at a blend ratio of 50:50 under an interlacing pressure of 0.08-0.30 MPa,and the composite blend fiber yarn had a breaking strength of 4.0-4.2 cN/dtex,an elongation at break of 24%-25%and a yarn unevenness of 1.17%-1.44%;and the composite blend fiber yarn had the effect of different colors in presence of the same dyestuff and different dyeing behavior in the same bath when different types of dyestuffs were selected for dyeing,and showed a clear pattern of colorful stripes due to the dyeing uniformity of 2.5-3.5 level.
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