Roller sticking phenomenon
1reason
⑴Continuously observe whether resin or viscous precipitation appears on the roll during processing. If it occurs, it will easily become a waterproof spot.
⑵ Its own stability: Screen for those with high stability.
⑶ Temperature: It is an emulsion. Especially in summer, when the water temperature is high, the ambient temperature is high, and the temperature of the fabric being processed is also high. Heat is continuously brought into the working fluid and the temperature of the working fluid rises. At this time, the stability of the emulsion decreases and the fluororesin is relatively easy to precipitate (break down). milk).
⑷pH: When the pH is higher than 7 and is alkaline, the stability of the waterproof working fluid will decrease, and it will also easily break and precipitate and stick to the roller.
⑸ Mixing of dyes and auxiliaries: If the processed fabrics are not cleaned, the remaining dyes (mostly anions) will fall off into the working fluid and combine with weak cations to cause instability in the working fluid.
⑹ Water quality: Only the filtered river water contains 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.
⑺ Continuous roller extrusion and mechanical shearing: When the above problems (1-5) exist, the stability of the working fluid decreases. At this time, it is easier to break the emulsion and stick to the stick during continuous rolling mill extrusion.
⑻Using 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.
2Main countermeasures
⑴ Set up a condensation circulating water pipe in the rolling tank or add ice packs to cool down;
⑵Add acid to adjust the pH of the working solution to 5-6.
⑶ Processed fabrics must be thoroughly washed and contain almost no alkali, dyes or additives.
⑷Add additives to improve the heat resistance and mechanical shear resistance stability of the working fluid.
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