Softeners can be divided into two types: fatty acid derivatives and organic silicone oils. The former is a traditionally widely used softener, while the latter is a new and emerging variety. The development speed of organosilicon softeners is very fast, and new varieties with various properties and functions are constantly being developed and launched.
Due to the superior softening effect of organosilicon softeners compared to traditional softeners, and the better durability of the finishing effect. So, in the use of textile soft finishing, it has occupied a dominant position. However, precisely because of its durability, once there are dyeing defects that need to be repaired before they can be solved, or defects caused by careless blocking operations during softening treatment, or color changes caused by softening treatment, repairing treatment will become more difficult.
Fatty acid derivative softeners and organosilicon softeners are mostly cationic, weakly cationic, or non-ionic in terms of ionic properties. Therefore, in applications where compatibility is allowed, they are often treated in one bath with color fixing agents. Their work bath DH values are generally stable when weakly acidic; The suitable temperature for processing the bath is 30-45 cc. After softening treatment, it is no longer washed, and after baking, its reaction to form a film has a higher firmness. If the blocking operation is not careful, silicone softeners are also prone to demulsification and oil bleaching problems. Some dyes that require softening treatment in the dyeing machine, such as finished clothes, yarn, loose fibers, etc., are also prone to accumulation of organic silicone oil substances in the equipment after prolonged use. Cleaning and repairing it is even more difficult than using fatty acid film softeners.
Organic silicone oil is essentially an insoluble oil that must be emulsified before it can be used in dyeing and finishing production. Some so-called water-soluble silicone oil varieties essentially have the function of self emulsification in water. If the properties and characteristics of organic silicone oil are not mastered during use, and the process conditions required by regulations are seriously violated, the problem of demulsification and oil separation will also occur.
Analyzing the physicochemical characteristics of organosilicon softeners can be summarized as follows:
a. The DH value range of work bath stability is 5-6.5.
b. Suitable temperature for work bath: 30-45 ℃.
c. Ionicity: Most varieties are cationic, followed by non-ionic, and some varieties are anionic. (Comparing the softness effects of various varieties, cationic ones generally dominate.)
Summarize the characteristics and commonalities of color fixing agents and softeners. When given stable process conditions, good treatment results will be achieved. If they are reversed, they can be destroyed and removed. Due to the highest firmness of organosilicon softeners, if organosilicon can be overcome, the rest will naturally be solved.