A PHOTOCATALYTIC METHOD OF DISCHARGE PRINTING FOR PRODUCING COLORFUL PATTERNS ON PREVIOUSLY DYED TEXTILES (As Amended)

摘要

A photocatalytic method of colored discharge printing for producing colorized patterns on textiles includes: textiles are over dyed with illuminant dyes and ground shade dyes respectively; then the patterned printing plates with hollow-outs decorative patterns are manufactured, and the photocatalyst is applied on the over-dyeing textiles through the hollow-outs; finally, with the photocatalytic method of colored discharge printing, the ground shade dyes are localized discolored, while the illuminant dyes are left on the substrates, having an effect of colorized patterns on textiles. The method has the characteristics of simple process and apparatuses, short processing, easy controlling and wide adaptability, along with eliminations of the needs for printing pastes and expensive printing apparatuses, so as the complicated process in the conventional printing method.

主权项

1. A photocatalytic method of discharge printing for producing colorful patterns on previously dyed textiles is characterized by the following steps:
a) dye the substrates with illuminant dyes to obtain dyed products; b) over dye the dyed products with ground shade dyes to obtain over-dyeing textiles; c) closely integrate the hollow-outs patterned printing plates and the over-dyeing textiles, or the printing plates are fixed in one side or both sides of the textiles; then the photocatalytic matter which is one of solution, collosol and white paste containing photocatalyst is applied on the hollow-outs of the patterns. The concentration of the photocatalytic matter is 0.10 g/L-10.00 g/L, and the pH value is 2-12; the photocatalytic matters described are reducing agents, oxidants and semiconductor nano-materials, or any combination of them, d) put them in a sealed container with a light source, and open the lamp following with light irradiating the over-dyeing textiles vertically and uniformly through the hollow-outs of patterned printing plates; then treat them by photochemical reaction in the condition of temperature ranging from 5° C. to 70° C., and processing time 1-120 minutes, ultimately, textiles with single or double sided colorized patterns which having a different shade to the textiles over-dyed are obtained, e) wash the textiles at room temperature and dry them to obtain products with colorized patterns.