Preparation And Properties Of Anti - Corrugated Cellulose Fibers

In this study, the fibre modification process was carried out in advance at the spinning stage. In the first part, regenarated cellulose/TPU composite fibre was prepared in Li Cl/DMAc solvent, which is the key research content. In the second part, BTCA crosslinking cellulose fibre was prepared in ionic liquid solvent. The main contents are as follows:(1) The compatibility of cellulose and TPU in Li Cl/DMAc solvent was studied accordding to dilute-solution viscometry, based on μ and a criteria of classic Huggins equation. It was shown that the conclusion was consistent: μ and a value was greater than zero, indicating the compatibility of cellulose and TPU was excellent.(2) The rheological property of cellulose/TPU blend spinning solution was studied by an advanced rotary rheometer. The static rheological measurements results showed that the viscosity decreased with increasing shear rates, exhibiting shear thinning behavior. The viscosity also decreased with increasing temperatures.The dynamic rheological measurements showed that the storage modulus of G’ and the loss modulus G’’ both increase with increasing frequencies. The non-Newtonian index of blend solutions increased with increasing TPU content, while the flow activation energy decreased with increasing shear rate.(3) The cellulose/TPU composite fibre was prepared using wet spinning method. The optimum process of spinning conditions and coagulation conditions was obtained by orthogonal test. The optimum process was obtained as follows: spinning solution concentration 6wt%, spinning temperature 20 ℃, TPU to cellulose(mass ratio) 3:10, coagulation bath temperature 20℃, coagulation bath length 100 cm, Li Cl mass ratio 15w%, draft ratio 200%. Under the optimum pocess, the WRA of the composite fiber was improved by 64.4% and the elongation was improved by 59.9% while the tensile strength decreases a little. The preparation method of BTCA crosslinking fibre was investigated. The dissolving property of BTCA and SHP in ionic liquid was studied. The influence of small molecule additive on the rheological property of spinning solution was studied. The optimum preparation process was obtained by single factor analysis : 4wt% BTCA(BTCA:SHP=8:5) was added into cellulose spinning solutions and then solidified for 30 s in 1wt% dilute sulfuric acid solution, two draft, precured at 90℃ for 2.5min and cured at 180℃ for 3min. The cross-linked fibre was obtained after washed in warm water. The dry WRA and wet WRA was improved by 76.4% and 41.1%, respectively.