Relationship between whiteness and poor dyeing effect of knitted fabrics and additives
At the same time of producing large goods, the knitting and dyeing factory reflects the quality of dyeing and finishing. There are many diseases and diseases. The disease of dyeing and finishing products is an important factor affecting the quality of dyeing and finishing products. The selection and quality of additives directly affect the dyeing. The quality of the entire product.
Poor whiteness, including whiteness is not pure, uneven and the hair effect is less than 8~10cm/30min. This is related to the quality of knitted fabrics. For example, low-grade cotton has many contents, and often whiteness and hairiness are not easy to do. Of course, most The key is the process development and the selection of additives. In the process development:
H2O2: not only acts as a bleaching pigment after pretreatment, but also has dedoping effect (including de-cotton seed shell), insufficient H2O2 (including decomposition too fast), whiteness is impossible to guarantee, NaOH not only provides H2O2 bleaching Alkalinity (PH), and with the scouring agent, the maximum degumming effect, the amount of NaOH is insufficient, the impurity is poor, the wool effect can not meet the requirements first, of course, the whiteness can not meet the requirements, so the amount of H2O2 and NaOH It can be said that it is the primary factor to ensure whiteness and gross effect.
2 use high quality scouring agent
The comprehensive effects of scouring agent such as cleansing, emulsifying, dispersing and infiltrating must be excellent to ensure the removal of impurities and ensure whiteness and gross effect. However, the quality of scouring agents on the market is uneven, we must choose products with excellent comprehensive effects. Not only the permeability and solid content are measured, but the penetration is only one aspect considered;
These two additives are mainly used to improve water quality, adsorb and complex metal ions such as Fe3+ in water, and prevent metal ions from catalyzing the rapid and inefficient decomposition of H2O2. If H2O2 decomposes rapidly, its whiteness and gross effect will not be achieved. Requirements, at the same time will cause fabric brittleness or even hole, so to achieve whiteness and hair effect, oxygen bleach stabilizer should choose excellent varieties, in the selection should focus on the decomposition rate of H2O2. The addition of the chelating dispersing agent not only chelate iron or the like, but also chelate various impurities in the water, so that the impurities do not re-stain the fabric and cause whiteness and dark ash, so the chelating dispersing agent is not only Consider its chelation to metal ions and also consider its dispersing power;
It takes a certain time and temperature to let the auxiliary react with the impurities. If the conditions are not enough, the pigment and impurities are not removed properly, and the whiteness and the gross effect can not be achieved:
It is very important to wash after bleaching. It is necessary to clean and remove the impurities to ensure whiteness and hairiness.
When choosing children's clothing, you should pay a little attention. The brighter the color, the more chemical elements are in the clothing, but parents don't have to worry too much. You can try a small area of color matching to play a finishing touch. However, the baby's skin is delicate, and parents should try to choose clothes that are nearly white and less colorful for their children.
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