English
| Quantity: | |
|---|---|
XF-B-3;XF-B-4;XF-270
XINFA
3907999990
Product Physical Indicators and Applications
Prooduct Spec | Hydroxyl value | Acid value | Mositure | Viscosity | Application areas |
mgKOH/g | mgKOH/g | % | mPa.s(25℃) | ||
XF-B-3 | 300±30 | ≤3.0 | ≤0.15 | 3000±500 | Slow-release fertilizer, controlled-release fertilizer |
XF-B-4 | 370±20 | ≤3.0 | ≤0.15 | 3500±500 | |
XF-270 | 260±10 | 3±0.2 | ≤0.1 | 3000±500 |
Recommended Standard Formulation for Controlled-Release Fertilizer Coating Agents
Component A | Xinfa Polyester polyol XF-B-3 | 90 |
Auxiliary additives | 9.5 | |
Colouring agent | 0.5 | |
Component B | PAPI | 80 |
Physical and Chemical Performance Parameters of the Product
Experimental Coating Parameters | Performance parameters of coating agent | ||
Ambient temperature for coating（℃ ） | 60-70 | Surface Appearance | Surface coating smooth and uniform |
Surface temperature of chemical fertilizer （℃） | 55-65 | Damage rate after boiling for 15 minutes | ≤5% |
POL/ISO | 1/0.8 | Initial release rate（24h） | ≤15% |
Number of coatings applied | ≥3 | Cumulative release rate | ≥85% |
Film coating duration（min) | ≤8min/time | Release cycle | 2-6 months |
※Note: The above parameters are based on laboratory data. Actual parameters may vary depending on formulation and process conditions. For reference only.
Polyester polyols react with isocyanates (typically MDI or PMDI) to form a polyurethane coating layer.
Typical process:
Polyester Polyol+MDI→Polyurethane Network\text{Polyester Polyol} + \text{MDI} \rightarrow \text{Polyurethane Network}Polyester Polyol+MDI→Polyurethane Network
The polyurethane shell:
Reduces nutrient loss
Controls nutrient diffusion
Improves fertilizer efficiency
Minimizes environmental pollution
Common coated fertilizers:
Urea
NPK granules
Ammonium sulfate
Potassium chloride
