Dry-transfer Printing Of Viscose And Protein Fiber Fabrics With Reactive Dyes

Dry-transfer printing of viscose and protein fiber fabrics with reactive dyes were studied in this paper. The printing process includes the following procedures: reactive dyes dissolution, diffused and fixed via steaming after giving a hot-pressing between transfer printing paper and dry state fabrics. The advantage of this printing method is that reactive dye transfer printing can be carried under the condition of none treatment to the fabrics, which can retain the skin adaptability and permeability of the fabrics to the utmost of extent. At the same time, production and emission of the effluent were reduced because of omitting of the prewetting treatment of the fabrics.Firstly, the effects of the high-substituted cellulose hydroxypropyl(H-HPC) dosage, sodium alginate(SA) dosage and the type and dosage of alkaline agent, urea dosage on the color yield, penetration rate and fixation rate of the printed viscose fabrics were discussed first. Then hot-pressing pressure, hot-pressing temperature, steaming temperature, steaming time of the transfer printing technology are optimized. The results show that the highest color yield and relatively high fixation rate, grade 4-5 of washing and rubbing fastness of the printed viscose fabrics are achieved when the modified paste contains 3% H-HPC, 2.5% SA, 5%urea, 3% sodium bicarbonate, 2.5% trichloroacetic acid(TCAA), 3% dicyandiamide, 0.5% nano-silica, and under the condition of hot-pressing temperature is 120℃, hot-pressing pressure is 5MPa, steaming temperature is 100℃, steaming time is 15 min.Secondly, the reactive dry-transfer printing of wool fabrics were investigated. The select of the thickening agents, the select of the p H control agents, the select of hygroscopic agent, the effect of the dosage of components and the technology of the reactive dry transfer printing were included in the research contents. The results showed that the highest color yield, grade 4-5 of washing and rubbing fastness of the wool printing fabrics were achieved when the modified paste contained 2% H-HPC, 0.75% CMC, 5% hygroscopic agent(urea/triglycol=30/70), 3% ammonium sulfate, 0.5% nano-silica, and under the condition of hot-pressing temperature was 125℃, hot-pressing pressure was 6MPa, steaming temperature was 100℃, steaming time was 30 min.At last, the dry-transfer printing and inkjet printing were compared and the printing performances of silk were analyzed. Waste liquid, color characteristic values, color fastness, outline sharpness, hand feeling and storage period of the two kinds of printing methods were compared. The results of the research showed: COD values of the inkjet printing waste water were 1.5 times of transfer printing, and dyes content in which was higher. Penetration of the silk transfer printing was well above inkjet printing. Decorative design fineness of the transfer printing was lower than inkjet printing, but line uniformity in which was higher. Color fastness of the silk prints obtained by the transfer printing was higher than those obtained by the inkjet printing. The impact of the placing time on the transfer printing was big, however, the impact on inkjet printing was small.