Application of low temperature sol polyurethane modified by APTES on wool fabrics

A low temperature sol polyurethane anti-felting agent modified with 3-aminopropyltrie-thoxysilane(APTES) was synthesized for wool as to reduce yellowing and impairment of fabric strength caused by high temperature curing when using traditional sol-gel method.Firstly a prepolymer with isocyanate group(—NCO) achieved from the reaction of isophorone diisocyanate(IPDI) with poly(propylene oxide dual)(PPD),and then blocked by 3-aminopropyltriethoxysilane to form a new precursor PPD-[Si(OEt)3]2.After that,a sol was prepared as anti-felting agent.Inorganic-organic hybrid film formed by the sol and its thermal property were characterized by FTIR and TGA.The sol agent was used to treat wool fabric samples at different curing temperature(120,140,160℃),and their anti-felting effects were compared.The results show that a better anti-felting effect is achieved by the new agent with low curing temperature at 120℃ for 3 min,and the area dimensional change is less than 3%.