The post-chain extension efficiency of APUDs were influenced by the particle size and the “cage effect” whatever the water or polyamine as the chain extender. The post-chain reaction mechanism: (a) small particle size; (b) big particle size.
Machine-washable and antimicrobial substances are the
demand for
the current wool fabrics. The characteristic of wool fabric is studied
with novel self-made azetidinium cationic polyurethane dispersions
(PUDs), which used dihydroxyalkyl glycidylamine as the chain extender.
Dihydroxyalkyl glycidylamine was synthesized by ring opening with
epichlorohydrin and diisopropanolamine. Influences of the cationic
PUDs on antibacterial properties, felting shrinkage, and yellowness
index of wool fabric are studied. The results show that the antifelting
feature of wool fabric with the cationic PUDs is better than the others.
It is also found that the wool fabric has a clear antibacterial property.
The optimal process has been concluded as follows: the compound PUDs
of 50 g/L and curing at 130 °C 5.0 min. The finished fabric has
low felting shrinkage after washing for 20 times at 60 °C.
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