Xiao Bian gave us a series of questions about the dyeing and finishing of knitted fabrics. If you have this problem, Xiao Bian can help you solve it.
1 H202 and NaOH must be sufficient
H202: After the pretreatment, it not only acts as a bleaching pigment, but also has a decontaminating effect (including cottonseed husks). The amount of H202 is insufficient (including decomposition is too fast), whiteness cannot be guaranteed, and NaOH not only provides the H202 bleaching required. Alkalinity (PH), but also with the scouring agent, play the largest decontamination effect, lack of NaOH, go to miscellaneous, poor, Mao Ying first can not meet the requirements, of course, whiteness can not meet the requirements, so the amount of H202 and NaOH It can be said that it is the primary factor that guarantees whiteness and brilliance;
2 Use high-quality scouring agent
The comprehensive effect of scouring agent such as cleansing, emulsifying, dispersing and infiltrating must be excellent to ensure that the impurities are removed from the net to ensure whiteness and gross effect. However, the quality of the scouring agent in the market is uneven, and we must choose products with excellent comprehensive effect. Not only the penetrating power and the solid content are measured, but the penetrating power is only one aspect considered;
3 oxygen bleach stabilizers and chelating dispersants
These two additives are mainly for the purpose of improving water quality, adsorbing and complexing metal ions such as Fe3+ in water, and preventing metal ions from catalyzing the rapid and inefficient decomposition of H202. If H202 decomposes quickly, its whiteness and gross effect will not be achieved. Requirements, at the same time will cause fabric damage or even holes, so to achieve whiteness and gross effect, oxygen bleach stabilizer to choose the best varieties, in the choice to focus on considering the decomposition rate of H202. The addition of the chelating dispersant not only chelates iron and the like, but also chelates various impurities in the dispersed water, so that these impurities do not re-contaminate the fabric and cause the phenomenon that the whiteness becomes dark and gray, and the chelating dispersant is not only To consider its chelation of metal ions but also to consider its dispersion;
4 Process conditions
It takes a certain amount of time and temperature for the additives and impurities to react. If the conditions are not met, the removal of pigments and impurities is not net, and the whiteness and the effect of the same effect cannot be achieved:
5 Washing
It is very important to practice after bleaching and washing. It is necessary to clean the impurities that have been removed to ensure whiteness and brilliance.
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