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Abstract
Textile auxiliaries are very Important for textile processing. They are widely used in large amounts, in pretreatment, coloration and finishing of textiles. The Egyptian market is crowded by so many textile auxiliaries; the majority of whichh are imported.
The present study aims at preparation of textiles printing binder, whichh may conduct for better environmentally friendly coloration. This study was designed to test the possibility that modified agricultural protein can be used as binder In textile pigment printing, to decrease the depending on petroleum based binders.
The processes of preparing textile printIng binder from soy bean Involve first isolation of soy protein from the beans. The work is further divided Into two parts. First part extended to modify SPI by urea, NaOH and acrylamide to break down the hydrogen bonding in the protein body, consequently, unfold the protein complex and improve adhesion of the film to the substrate. First part also extended to study the technical properties of prepared samples as binder for printing cotton and polyester fabrics with three different pigments. The second part of this study extended to modify soy protein Isolate by urea, NaOH and methylolacrylamide, and study the effect of using microwave heating for the same modification on the propertiesof the binder. It is though that microwave will able to penetrate the mixture in very short time. That can shorten the modification period with level and homogeneous action on both the outer and interior of the mixture. For the sake of comparison microwave heating is used to modify SPI under the same conditIon of conventional heating and with different Interval of
Times
It was observed that addition of acrylamIde or methylolacrylamide to SPI binder results In enhancing the water resistance of binder film and decreasing the water absorption and the weight loss of binder film in water. Also the pastes of both prepared binders had good rheological properties with pesudoplastic which enable these types of binders to be used in silk screen or roller printing methods. Also these types of binders have thickening behavior so that reduce the amount of synthetic thickener added. Moreover, the color strength values for pigment printed areas with them were similar to that of pigment printed areas with the commercial binder Alcoprint PB - HC. Both binders gave excellent fastness to light, washing and to acid and alkaline perspiration; all the prints exhibited little or no color loss or color change. The crocking fastnesses of the prints with methylolacrylamide modified SPI binder were satisfactory while acrylamide modified SPI binder was mixed with the commercial binder to enhance the crock fastnessesproperties. Both prepared binders have significant effect on Abstract reducing the amount of formaldehyde released from pastes during curing and also reducing.