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Polyurethane Coating Agent for Slow Release Fertilizer is a modified polymer coating material developed for the production of slow-release and controlled-release fertilizers.
It forms a dense and uniform coating layer on fertilizer granules, helping regulate nutrient release, extend fertilizer efficiency and improve nutrient utilization.
The coating formulation can be customized according to fertilizer type, target release period, crop requirements, local climate, soil conditions and production process.
This product is suitable for the production of:
Slow-release fertilizer
Controlled-release fertilizer
Polyurethane-coated urea
Coated compound fertilizer
High-tower compound fertilizer
Conventional compound fertilizer
Organic fertilizer granules
| Item | Specification | Test Method |
|---|---|---|
| Appearance at ≥25°C | Yellow liquid | GB/T 1664-1995 |
| Acid Value | 0.51 mgKOH/g | GB/T 1668-2008 |
| Viscosity at 25°C | 683 mPa·s | GB/T 10247-2008 |
| Hydroxyl Value | 249 mgKOH/g | Potentiometric titration |
| Moisture | 0.3% | Karl Fischer moisture analysis |
The above data represents typical test results and may vary slightly depending on the production batch.
The coating formulation supports customized nutrient release periods from 30 to 180 days.
Available release periods include:
60 days
90 days
120 days
Other customized periods from 30 to 180 days
The nutrient release profile can be adjusted to match different crop growth cycles and soil conditions.
The product forms a dense and uniform coating film with strong adhesion to fertilizer granules.
The coating helps reduce:
Cracking
Peeling
Powdering
Moisture absorption
Fertilizer caking during storage
It is suitable for fertilizer products requiring storage stability and long-distance transportation.
The coating agent has good fluidity and sprayability, allowing it to be evenly distributed over fertilizer granules.
Under recommended processing conditions, initial film formation can be completed in approximately 5 minutes, with full curing in approximately 1 hour.
Actual film formation and curing time depend on temperature, coating dosage, fertilizer granule quality and production equipment.
The product can be used with common fertilizer coating equipment, including:
Rotary drum coating equipment
Fluidized-bed coating equipment
Mixing and polishing equipment
Standard hot-coating production lines
No highly complex production system is required. Specific process parameters can be adjusted according to the customer’s existing equipment.
For coated urea production, the recommended coating-agent dosage is approximately:
8–10 kg per metric ton of urea
The actual dosage should be determined according to:
Target nutrient release period
Fertilizer particle size
Surface condition of fertilizer granules
Coating equipment
Production temperature
Required coating thickness
The coating layer helps control the release of nitrogen and other nutrients, reducing rapid nutrient release at the early stage and insufficient nutrient supply at the later stage.
It can help:
Extend fertilizer efficiency
Improve nutrient utilization
Reduce fertilizer application frequency
Reduce labor requirements
Reduce nutrient loss through leaching and volatilization
Polyurethane-coated urea produced with a suitable formulation and coating process may achieve the following reference indicators:
| Parameter | Reference Value |
|---|---|
| Nitrogen Content | ≥45.0% |
| Nitrogen Release Rate Within 24 Hours | ≤3% |
| Nitrogen Release Rate Within 28 Days | ≤60% |
| Nitrogen Release Rate Within 50 Days | ≥80% |
| Particle Size of 2.00–4.75 mm | ≥95% |
These values are reference indicators rather than guaranteed specifications for every production condition. Final coated-fertilizer performance depends on raw fertilizer quality, coating dosage, formulation, equipment and process control.
A typical hot-coating process includes the following steps:
Screen and prepare the fertilizer granules.
Heat the fertilizer granules to the required processing temperature.
Spray the coating agent evenly onto the rotating fertilizer granules.
Continue mixing to ensure uniform surface coverage.
Complete coating, polishing and film formation.
Allow sufficient curing before cooling and packaging.
The appropriate temperature, spraying rate, coating time and curing conditions should be determined through production testing.
Customized coating formulations are available according to:
Fertilizer type
Target release period
Crop type
Climate conditions
Soil conditions
Fertilizer particle size
Existing production equipment
Customer production process
Destination market requirements
Customers can provide fertilizer samples and target release requirements for technical evaluation.
For a faster quotation and technical recommendation, please provide:
Type of fertilizer to be coated
Target release period
Fertilizer particle size
Current coating equipment
Required monthly or annual quantity
Packaging requirements
Destination country and port
Sample testing requirements
Contact us for:
Product specifications
Technical data
Sample evaluation
Application guidance
Customized coating formulations
Commercial quotation
We welcome inquiries from fertilizer manufacturers, coated-urea producers, agricultural chemical distributors and international fertilizer importers.
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