2. Molecular structure of waterproof agent

3. Effect diagram and schematic diagram of finishing agent on fabric surface

The cause of silicone oil stain
1. Alkalinity
During the pretreatment of cotton fabric, alkali with higher concentration is usually used to remove impurities from the fabric (especially mercerization alkali is used more). It is not easy to clean the alkali when it enters the fiber, and alkali should also be added during dyeing (reactive vat dyes), so the cloth surface may be alkaline during the finishing.
However, chemical fiber fabrics must be restored and cleaned after dyeing. At present, printing and dyeing plants are still using sodium hydrosulfite and caustic soda for cleaning. If they are not cleaned after dyeing, it will also cause alkali on the surface of soft cloth before dyeing. However, ordinary silicone oil is not alkali resistant and will break its emulsion under alkaline conditions, which is the reason why the mill sticks to the roll after passing thousands of meters during the dip rolling process. Therefore, before softening, the alkali agent must be cleaned or acetic acid must be added to the working solution to keep the groove PH5-6.

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