Causes and solutions for roller sticking:
(1)Stability of itself: Solution: Screen for those with high stability.
(2)Temperature: It is an emulsion, especially in summer when the water temperature is high, the ambient temperature is high, and the temperature of the processed fabric is also high, which continuously brings heat into The working fluid will cause the temperature of the working fluid to rise. At this time, the stability of the emulsion is reduced, and the fluororesin is relatively easy to break and separate out. Solution: Set up a condensation circulating water pipe in the rolling groove or add ice packs to cool down;
(3)pH: When the pH is higher than 7 and is alkaline, the stability of the waterproof working fluid will decrease and it will easily break and separate out. Sticky roller. Solution: Add acid to adjust the pH of the working solution to 56.
(4)Mixing of dyes and auxiliaries: If the processed fabric is not cleaned, the remaining dyes (mostly anions) will fall off When it enters the working fluid, it will combine with weak cations and cause the working fluid to become unstable. Solution: Processed fabrics should be fully washed and contain almost no alkali, dyes or additives.
(5)Water quality: The filtered river water may contain suspended solids or other substances depending on the season. It is easy to combine or flocculate when encountering weak cations. It is strictly prohibited to use it when preparing working fluid.
(6)Continuous squeezing by rollers and mechanical shearing: When the above problem (5) exists, the stability of the working fluid decreases, and then continuous It is easier to break the emulsion and stick to the stick when squeezed by the rolling mill. Solution: Add additives to improve the heat resistance and mechanical shear stability of the working fluid
(7) Using additives in the same bath: Pay attention to the ionicity of the added additives and whether the pH is opposite (for example, do not mix anionic acrylic resin and cationic resin). Melamine resin can be mixed with water, but be careful not to use it for a long time after preparation, because melamine resin will condense itself in the acidic waterproof working fluid, especially at high temperatures, which is one of the factors that will cause the roller to stick.
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