Investigation On Cyclodextirn Modification And Application Properties In Textiles

β-cyclodexrtrin (β-CD) has the excellent biodegradability. It can be applied to thepretreatment of polyester, cotton, silk and P/C blends fabrics using physical and chemicalmethods. After the treatment, the properties of the fabrics were improved and the moleculeswith certain sizes could be included in the cavity of β-CD on the fabrics.The surface resistance of β-CD/CTR treated polyester was decreased from3.92×10~9to1.37×10~6. It indicated that the hydrophilicity was improved. The rigidity of the modifiedpolyester fabric was increased comparing with the untreated fabric. The surface morphologyanalysis demonstrated that the surface roughness was increased. The Ra, Rq and H valueswere enhanced from4.49nm,5.82nm and45.10nm to9.37nm,12.60nm and64.30nm,respectively. The K/S value of the inkjet printing fabric was increased from3.59to5.31andthe line with was declined from4.01mm to0.92mm when the β-CD and CTR concentration100g/L, sodium hypophosphite (SHP)30g/L. The decreased line width meant the improveddefinition. β-cyclodextrrin provided a potential way to inkjet polyester fabric pretreatment.The FTIR spectrum of the β-CD/CTR treated cotton fabric showed that the absortionpeak of the hydroxyl group at3330cm-1was decreased sharply and the obvious peak of esterlinkage at1713.39cm-1appeared. The crease recovery property of the modified cotton wasenhanced and the breaking strength of warp-wise was decreased from656N to464N. Thecolor depth and the definition of inkjet printing were improved. The K/S value at610nm wasincreased from4.27to6.60. The printed line width was decreased from1.48mm to1.25mmwhen the presetted width was1.00mm. β-CD/CTR could be applied to pretreat the cottonfabric and improve the inkjet printing color depth, definition and crease recovery propertywith a little loss of breaking strength.The silk fabric treated with80g/L β-CD,80g/L CTR and30g/L SHP obtained7.5%weight gain with the decrease of whiteness from79.61to78.81. The breaking strength of theweft yarn decreased from538N to476N. The color depth was enhanced by lowering thepossibility of penetrations of ink droplets. β-CD/CTR treatment enhanced the inkjet printingcolor depth of silk fabric with the decrease of whiteness and strength.Quaternary ammonium substituted β-CD was synthetized. The zeta potential ofquaternary ammonium substituted β-CD in solution was increased fromβ-20.0mV to about0mV. It improved the affinity of β-CD to the electronegative fabrics and prevented thepenetrations of the electronegative ink droplets to the surroundings. The K/S values ofpolyester and cotton fabrics treated at60℃and pH11were increased from4.24to4.89andfrom5.47to7.32, respectively. Quaternary ammonium substituted β-CD could be used toimprove the inkjet printing performance of polyester and cotton fabrics. NaOH and MCT-β-CD were applied to modify the polyester fabric successively and thetransfer printing property was investigated. The FTIR and UV absorption spectrogramsconfirmed the grafting of MCT-β-CD. The wetting properties of the water and ink droplets onthe fabric were increased comparing with the untreated fabric. The K/S value increased from7.81to9.56after pretreatment. It was enhanced by22.51%. Decreasing the transfertemperature and lowering the transfer time would increase the increasing rate. The colordepths of transfer printing on polyester fabrics could be enhanced by pretreating with NaOHand MCT-β-CD. The wettability of polyester fabric was improved and the inkjet transferprinting properties was enhanced.The cross-linkings of the resins induced by the UV light was used to attach β-CD to thefabrics. The concentrations of β-CD, resin and the initiator had an important influence on thetransfer printing property. The K/S value could be increased from14.52to16.64while β-CDconcentration40g/L, resin40g/L and the initiator dosage2%. The enhanced℃valueindicated the yellowing of the fabric. The inclusion experiment showed that β-CD fixed onthe fabrics could still include the appropriate molecules. UV light induced resion crosslinkingmethod could improve the color depth of inkjet transfer printing. However, the whiteness wasdeclined.Cationic red5GN formed inclusion complexes with β-CD with increasing temperature.The K/S values of β-CD/CTR and β-CD/BTCA treated polyester fabrics dyed with cationicred5GN reached4.00and3.31with good levelness. The washing fastness of the dyed fabricwas improved by treating with sols. And the washing fastness of the acid sol coated fabricwas better than that coated with alkaline sol. The β-CD/CTR modified polyester fabric couldbe dyed with all of the selected cationic dyes with different structures. The one-bath dyeing ofP/C blends was obtained by the cationic red5GN. The K/S value of the β-CD/CTR modifiedP/C blends fabric reached8.77comparing with that of the untreated fabric0.73. The cationicred5GN dyed both of the cotton and polyester fibers. The dry and wet rubbing fastnesseswere grade3and grade2-3, respectively. The washing fastness of fading and staining wereboth grade2-3. Consequently, β-CD/CTR treated polyester, cotton and P/C blends could bedyed with cationic dyes. The dyeing temperature of polyester fabric was decreased, the colorgamut of cotton fabric was enlarged and one-bath dyeing of P/C blends was approached withcationic dyes.