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Sep 28, 2020
Softeners can be divided into two types: fatty acid derivatives and silicone oils. The former is a traditionally widely used softener, and the latter is a new species that comes from behind. The development of silicone softeners is fast, and new varieties with various properties and functions are constantly being developed and marketed.
Because silicone softeners not only have better softening effect than traditional softeners, but also the finishing effect has better durability. Therefore, it has occupied a dominant position in the soft finishing of textiles. But because of its durable effect, once there is a staining defect that needs to be repaired, or a defect occurs due to the careless operation of the softening process, or the color change caused by the softening process, repair it It will become more difficult.
Fatty acid derivative softeners and silicone softeners are mostly cationic, weakly cationic or non-ionic in terms of ionic properties. Therefore, if compatibility is allowed, they are often used with fixing agents in applications. One-bath treatment. The DH value of their working bath is basically the best when it is weakly acidic; the treatment bath temperature is 30-45 cc. After the softening treatment, it is no longer washed, and the fastness of the reaction film formation is higher after baking. If the car is blocked, the silicone softener is also prone to demulsification and oil drift. Certain dyed materials that need to be softened in the dyeing machine, such as garments, yarns, loose fibers, etc., are also prone to accumulative contamination of silicone oil substances in the equipment after a long time. It is more difficult to remove and repair than fatty acid softeners.
Silicone oil is essentially water-insoluble "oil" and must be emulsified before it can be used in dyeing and finishing. Some so-called water-soluble silicone oils essentially have the function of self-emulsification in water. If you do not grasp the properties of silicone oils during use and seriously violate the required process conditions, the problem of demulsification and oil separation will also occur.
Analyzing the physical and chemical characteristics of silicone softeners, the main points are summarized as follows: a. The best stability of the working bath DH value range: 5-6.5. b. The most suitable temperature for working bath: 30-45℃. c. Ionicity: Most varieties are cationic, followed by non-ionic, and some varieties are anionic. (Comparing the softening effects of various varieties, the cationic type is generally superior.)
Summarize the characteristics and commonalities of fixing agents and softeners, and when they are given the most stable process conditions, good treatment effects will be obtained. If you do the opposite, you can destroy and remove them. Since the silicone softener has the highest fastness, if the silicone can be overcome, the others will naturally be solved.