Due to the sensitivity of synthetic thickeners to electrolytes, their swelling degree decreases when exposed to electrolytes, resulting in a significant decrease in viscosity. Therefore, dispersed dyes with additives are used
It must be non-ionic. This type of dye is mainly imported, which will increase costs. The dispersants used in domestic dyes are mainly ionic.
Domestic synthetic thickeners are made into a dispersed liquid, which exhibits stability by adding certain stabilizers, emulsifiers, and wetting agents. After encountering water, it can quickly disperse and transform into a viscous slurry. LutexalHSFo thickener PF natural paste, it can be seen that domestic synthetic thickeners have relatively low sensitivity to electrolytes. The amount of domestic dyes used is generally between 4% and 6%. However, changes in dye dosage have little effect on viscosity, so domestic synthetic thickeners are mainly used for thickening in large-scale production.
By changing the baking temperature and time of the sample, we found that the dye saturation was basically reached when the temperature was 200 ℃ and the time was 30 seconds. In large-scale production, the SST shaping machine can be used for baking. The temperature is 200 ℃ and the vehicle speed is 30m/min. Due to the high-temperature baking of polyester taffeta after coating and dyeing, the thickening agent forms a thin film on the surface of the silk, which is not easy to wash away. But the synthesized thickener rapidly swells and dissolves in caustic soda solution. So to remove floating color and slurry, alkali can be used on a dyeing or desizing machine.
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