Study On The Effect Of Slef-cleaning Finishing To Wool Fabric

With the improving of living standard, the demand of wool fabric which is the first choice to beused in high fashion is increasing. However, wool fabric is easy to shrink when it is washed by waterwhich makes the maintaining of wool garment difficult. Nowadays, people pay more attention toself-cleaning textiles among which TiO2/SiO2treatment is the hot spot. Self-cleaning textiles candecompose organic stains under UV illumination without any labor force and water.In this paper, KROY/CMT finished wool fabrics were pretreated by polybasic carboxylic acidand then modified by TiO2/SiO2sol. The results showed that the free carboxyl group of polybasiccarboxylic acid can augment the enrichment of TiO2and SiO2nanoparticles on fabrics. Theexperimental results were achieved as follows:(1) Compared with untreated wool fabrics, the FTIR spectrum of polybasic carboxylic acidpretreated wool fabric changed, which new absorption peaks appeared at1161cm-1and1230cm-1attributed to the stretching of C—O, and the intensity of the absorption peaks subjected to amide Ⅰ(1644cm-1) and amide Ⅱ(1537cm-1) increased. All the changes demonstrated that ester band andamide band were produced in the process of pretreatment. Furthermore, a new absorption peak at1700cm-1was observed in TiO2/SiO2sol treated wool fabric which was related to the interactionbetween the surface carboxyl groups of wool and titanium. Moreover, another new absorptionpeak was contributed to the Ti—O—Si at895cm-1. The two new absorption peaks indicated theinteraction between wool and titanium and the graft of TiO2/SiO2sol on wool fabric.(2) The conclusions regarding the pretreatment of polybasic carboxylic acid are as follows.The color of CA pretreated wool fabric was easier to change in the comparison of BTCA pretreatedwool fabric. And the total color difference before and after polybasic carboxylic acidpretreatment increased with the increase of acid concentration and the color change could berecognized by eyes when the concentration attained to75g/L. The wrinkle resistance of woolfabric was decreased after the polybasic carboxylic acid treatment, while the wrinkle resistancewould be enhanced with the increase of acid concentration. Self-cleaning treated wool fabric withBTCA pretreatment had better self-cleaning property, wrinkle resistance property and anti-UVproperty as compared with self-cleaning treated wool fabric with CA pretreatment. Therefore, thepretreatment of BTCA had better properties for self-cleaning fabric and the optimal concentrationwas60g/L.(3) The conclusions related to TiO2/SiO2sol treatment were as follows. The contact angledecreased with the increase of SiO2percentage. The self-cleaning and anti-UV properties ofTiO2/SiO2sol treated wool fabrics were:50:50＞30:70＞70:30.(4) The color change of scales-smoothed wool fabric is the most obvious during the pretreatment of polybasic carboxylic acid. Nevertheless, scales-smoothed wool fabrics had the besthydrophilicity, wrinkle resistance, self-cleaning property and anti-UV property among the threekinds of wool fabrics after the same pretreatment and TiO2/SiO2sol treatment. The optimumtreatment of KROY/CMT treated wool fabrics was60g/L BTCA pretreatment and50:50TiO2/SiO2sol treatment. The wrinkle resistance and tensile strength of treated scales-smoothed wool fabricswere slightly decreased, but other properties were markedly improved such as hydrophilicity,anti-UV property, self-cleaning property and the value of which indicates the self-cleaningproperty improved25times.