Preparation Technology And Performance Study Of Oxycellulose Coated With Titanium Dioxide

Sodium periodate oxidized cellulose selectively, and potassium permanganate oxidized it further. Dicarboxyl cellulose was got. Dicarboxyl cellulose and titanium dioxide were primarily bonded in the form of chemical combination by ultrasonic processing in titanium dioxide suspension. Then it soaked for some time in the sodium copper chlorophyll solution to make laden titanium dioxide get sensitization. The more reasonable parameter values are obtained. As follows: the concentration of sodium periodate(0.05 mol·L-1), sodium periodate(40 ?, 4 h;60 ?, 40 min), potassium permanganate(0.4 mol·L-1; 40 ?, 20 min), two ultrasound titanium dioxide content(0.0120 g·(50 m L)-1 deionized water), sodium copper chlorophyll content(0.0100 g·(50 mL)-1 deionized water), and sensitization time(10 h). By the analyses of FTIR(fourier transform infrared spectrometer), FESEM(field emission scanning electron microscopy)and XRD(X- ray diffraction), we are sure that titanium dioxide can be loaded evenly on the nonwoven fabric, and its surface is sensitized by sodium copper chlorophyll.The paper testing the performance of the materials prepared, such as photocatalytic performance, soaping fastness resistance, UV resistance, thermal performance.(1) When we degraded rhodamine B for 1 h, the degradation rate started to increase. Because sunlight came to be stronger at that point, that was to say, the number of visible and ultraviolet light was increased and sunlight may provide sufficient light energy for photocatalytic degradation. Light degradation time for 3 h, the oxidized cellulose loading dye-sensitized TiO2 nanocrystalline(OCLDT) degraded rhodamine B completely, however, the TiO2 nanocrystalline(TN) and the oxidized cellulose loading TiO2 nanocrystalline(OCLT) got the survival rate of 89.2 %, 71.6 %,respectively. The response of OCLDT to sunlight was stronger, and OCLDT could make more use of sunlight. After being washed 15 times, OCLDT still had the good ability to degrade rhodamine B.(2) Under the fluorescent lamp, after degrading the formaldehyde solution for 5 h,the removal rate of formaldehyde reached 29.0 %, and 23.2 % after being washed 15 times,however, the removal rates of TN and OCLT which were not washed were less than 10.0 %.Under the fluorescent lamp degrading the formaldehyde solution, OCLDT was the best.(3) After being washed 3 ~ 18 times, its color fastness could reach grade 3 ~ 4.(4) After being washed 15 times, its ultraviolet resistance ability decreased, however it still had good effect.(5)TG analysis showed that the last remaining rate of the original cloth(OC) and OCLDT were11.6 %, 21.0 %, respectively. And the dye-sensitized titanium dioxide of OCLDT accounted for about 3.1 %(weight). So it shows that the sensitized TiO2 loaded on the cellulose material could have an obvious flame retardant. DTG analysis showed that in the initial stage of degradation,rapid weight loss rate of OCLDT material; and in the main stage of degradation, weight loss rate of OC increased rapidly, then soon more than OCLDT, and the Maximum of weight loss rate was33 ? in advance, because the sensitized TiO2 obviously catalyzed the cellulose degradation; in the stage of residue degradation, the degradation rate of OCLDT was higher than OC, but the degradation rate lagged 10 ?, because the sensitized TiO2 was conducive to dehydrating fiber into charcoal in the second stage, but the carbonaceous residue generated was not stable at high temperature. The generalized analysis showed that sensitized TiO2 was beneficial to improve the flame retardant properties of the cellulose material.(6) In terms of limiting oxygen index(LOI),OC belonged to flammable materials(LOI < 22), and OCLDT belonged to the flame retardant materials(LOI > 27). The sensitized TiO2 loaded had played a good flame retardant role.