Abstract:

Nano-crystalline cellulose (NCC) was prepared by acid hydrolysis and cooperated with organo-silicon on cotton fabric for water-repellent finishing by two-bath process in order to develop a fluorine-free and eco-friendly water-repellent finishing method. The preparation condition of NCC was optimized. Structure and property of NCC were charactered by FT-IR, X-ray diffraction and thermogravimetry. Influence of particle size of NCC and parameters of finishing on water repellency were discussed. The results indicate that optimized preparation condition of NCC is: H2SO4 concentration is 60 wt% to 65wt%, temperature is 40-50℃ and acid hydrolysis time is 2 to3 h. NCC of 220 nm cooperated with organo- silicon water repellent finishing agents can increase water-repellency grade from 85 marks to 95marks. The photo of SEM proves that rough structure on the surface of finished fabric has formed. When NCC is used in water repellent finishing cooperated with organo-silicon, the optimized parameters of finishing are: drying time of NCC is 180s, curing time of water repellent finishing is 90s, curing temperature is 160℃.

Key words: nano-crystalline cellulose, acid hydrolysis method, water-repellent finishing, organo- silicon