The Generation Reason and Improve Measures of Fixation Spot Caused By Nylon Dye-Fixing Agent
1.Dye-fixing agent theory. The basic principle is the covering theory, fixing agent is polymer, containing many sulfonic group with nylon fiber end amino bonded, forming a net structure, coated with dye, the color fastness to washing can be guaranteed and improve. 2.Dye-fixing condition In general, dye-fixing agent is as follows: Temp：70-80 ℃ PH：4.0-4.5 Time：20-30 min. Both the higher and lower temperature have negative influence on the dye-fixing effect. When the temperature is too low, the dye fixing agent can not be absorbed completely. When the temperature is too high, the dye-fixing agent penetrate too much to the inner of fiber and the covering effect will affected. So both of them will effect the result. 3.The reason for nylon color fixing spot The dyeing Nylon color fixing spot usually be caused by the following reasons: (1)the excessive hardness (Ca++, Mg++)of water (2)the weak cationic auxiliary residue on the fabric (3)the influence of aci...