Abstract:

A low temperature sol polyurethane anti-felting agent modified with 3-aminopropyltriethoxysilane (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 for 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, 140，160oC)，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 120oC for 3 min，and the area dimensional change is less than 3%.