Papermaking defoamer XS-02 is a high-concentration (active ingredient ≥99%), non-ionic polyether ester defoamer, appearing as a milky white to light yellow viscous liquid. Its most prominent usage feature is good self-emulsifying and dispersing performance, easily soluble in cold or warm water. In practical applications, it is strongly recommended to adopt the method of "on-site dilution, continuous addition". This can fully utilize its high-efficiency defoaming and foam-suppressing ability at extremely low dosages, and ensure perfect compatibility with the papermaking system without causing precipitation or oil spots. Avoid pouring large amounts of undiluted concentrate at once, which may lead to local high concentration, uneven dispersion, and conversely affect the effect.
Since the product's molecular structure contains ester bonds, it may undergo slow hydrolysis in high-temperature and strong alkaline environments (such as pulping black liquor), but this characteristic also endows it with good biodegradability and environmental compatibility. Therefore, under such extreme working conditions, the usage principle of "prepare as needed, feed continuously" should be followed even more strictly, avoiding prolonged static settling or deactivation of the diluted emulsion, ensuring that the fresh emulsion fully contacts the foam layer, achieving instant bubble breaking and long-term foam suppression.
The following are reference data based on the general characteristics of the product and conventional practices in the paper industry, for you to adjust the process according to actual foam conditions:
| Application Process | Recommended Addition Point | Reference Dosage and Method |
|---|---|---|
| Pulping Black Liquor | Washing machine spray pipe, black liquor tank inlet, foam overflow port | Higher dosage, usually 0.02% ~ 0.1% (200~1000 ppm) of the total system. It is recommended to dilute with cold water to a 10%~20% emulsion and continuously drip-feed via a metering pump to the foam generation source. |
| Paper Machine White Water | White water tray, water seal tank, under-wire white water pit | Very low dosage, usually 0.005% ~ 0.03% (50~300 ppm). Dilute to 5%~10% concentration and add continuously, effectively eliminating microbubbles and improving retention rate. |
| Coating Color / Sizing Liquid | Coating mixing tank, feed tank, return tank | Dosage is 0.01% ~ 0.05% (100~500 ppm). It is recommended to slowly add the diluted liquid during the pigment dispersion stage to completely remove bubbles from the color, preventing pinholes in the coating. |
| Industrial Water Treatment | Aeration tank inlet, circulating water return port | Dosage 0.1 ~ 0.5 g/L. Either the concentrate or the diluted liquid can be added directly, with no adverse effect on the microbial community. |
The following are key technical parameters related to dilution and operation (source: Guoli Chemical Product Database)
| Parameter Item | Specification Value |
|---|---|
| Appearance | Milky white to light yellow viscous liquid |
| Active Content | ≥99% |
| Ionic Type | Non-ionic |
| 1% Aqueous Solution pH | 5.0 ~ 8.0 |
| Cloud Point | 15 ~ 30 °C |
| Density (20°C) | 0.85 ~ 1.05 g/cm³ |
| Solubility | Easily dispersible in cold or warm water |
| Stability in Alkali Solution | General, ester bonds may slowly hydrolyze under strong alkali (recommend preparing immediately before use) |