Urea Slow-Release Coating Agent | Bio-Based PU Fertilizer Coating Resin

Product Overview

FRX-03S-1 Urea slow-release coating resin is the core functional material for producing high-efficiency controlled-release urea fertilizer. Polyurethane (PU) stands out as the most ideal coating material for slow-release fertilizers, featuring adjustable molecular structure that enables precise and controllable nutrient release. Different from traditional coating materials, PU coating forms a dense and uniform protective film on urea surfaces through solvent-free in-situ reaction, effectively locking urea nutrients and avoiding rapid dissolution and fertilizer loss.

This urea slow-release coating agent is an independently developed bio-based degradable PU coating resin tailored for urea slow-release modification. Leveraging 20 years of professional R&D and production experience in polyurethane resin materials and combining global advanced slow-release fertilizer coating technologies, we adopt multiple targeted modification processes to optimize film density, water resistance and release control performance. This professional urea coating agent realizes ultra-thin coating and long-term slow release, perfectly matching the growth cycle and nutrient absorption rhythm of various crops.

With a low coating dosage of only 1%-3%, FR-03S-1 urea slow-release coating agent can extend the urea nutrient release period to more than 60 days, effectively improving fertilizer utilization rate and reducing repeated fertilization costs. The finished coated urea fully complies with EU standards for initial dissolution rate, micro-dissolution rate and biodegradability. It is highly compatible with all mainstream commercial granular urea, suitable for thermal rotary drum and hot-air spouted bed coating processes, with fast 5-minute curing to support continuous and large-scale production of slow-release urea.

Core Advantages

• Precise Long-Term Slow Release, High Fertilizer Utilization: As a professional urea slow-release coating agent, it forms a dense isolation film on urea surfaces. It effectively suppresses rapid nutrient dissolution, achieves uniform and stable nitrogen release, fits crop growth demands, and greatly improves urea fertilizer efficiency.
• Low Coating Dosage, Cost-Effective: This PU fertilizer coating resin delivers excellent slow-release performance with only 1%-3% coating dosage. Compared with traditional coating materials, it reduces raw material consumption while ensuring long slow-release cycle, lowering overall production costs of controlled-release urea.
• Bio-Based Degradable, Eco-Friendly: Solvent-free and heavy-metal-free formula adopts bio-based degradable components. The coating film can be naturally degraded in soil after completing the slow-release function, no residue and no pollution, meeting green agricultural production and EU environmental protection standards.
• Superior Film Performance, Stable Release Effect: Modified polyurethane structure enhances film mechanical strength and water resistance. The coating film is not easy to crack or damage during transportation and application, avoiding early nutrient leakage and ensuring stable and consistent slow-release effect.
• Wide Process Adaptability & High Efficiency: Compatible with mainstream urea coating equipment including rotary drum and spouted bed machines. Fast curing within 5 minutes shortens production cycle, perfectly adapting to mass continuous production of slow-release urea fertilizer.

Working Principle

FR-03S-1 urea slow-release coating agent is a two-component PU system composed of Component A modified resin and Component B PAPI isocyanate. After precise proportioning, the agent is evenly sprayed on the surface of pre-heated urea granules, and undergoes solvent-free in-situ polymerization reaction to form a continuous, dense and elastic protective film.

The compact PU coating film acts as a physical slow-release barrier. It controls the infiltration speed of soil water and the diffusion rate of internal urea nutrients, realizing graded and delayed nitrogen release. The nutrient release cycle fully matches the crop growth cycle, solving the problems of early fertilizer burning and later fertilizer deficiency caused by traditional urea’s fast release. After the release cycle ends, the bio-based coating film will gradually degrade in the soil, zero impact on ecological environment.

Recommended Process Parameters

Component A Technical Specifications

Packaging Specifications

• Component A: 200L iron drum, 220 kg per drum
• Component B: Original supplier package, 250 kg per drum

Storage & Operating Instructions

Thoroughly stir and homogenize Component A before use after long-term static storage to ensure uniform slow-release performance of the coating agent. Store both components in tightly sealed containers and well-ventilated warehouses, with storage temperature controlled at 15℃-35℃. Low temperature will increase resin viscosity and affect coating uniformity and slow-release effect. Avoid long-term low-temperature storage and direct sunlight.

Shelf-life: 12 months from production date under standard sealed storage conditions.

Safety Statement

Ingestion of this liquid urea slow-release coating agent is strictly prohibited. Component A causes no obvious skin irritation or sensitization upon contact. Wear professional protective equipment such as goggles and chemical-resistant gloves during handling and construction. Refer to the official SDS document for complete safety operation specifications.

Disclaimer

All technical data and performance descriptions are based on professional laboratory and pilot production tests for reference only, focusing on the stable slow-release performance of the urea coating agent. Actual product effect is affected by on-site production processes, urea raw material quality and operating parameters. Users shall conduct pre-production trials to verify applicability. Product formulas and parameters can be optimized and updated with technical iteration without prior notice.

FAQ

Q1: What is the core function of FR-03S-1 urea slow-release coating agent?

It is a special PU coating resin for urea modification, which forms a dense protective film on urea surfaces. It controls nitrogen release rate stably, realizes long-term slow release, improves fertilizer utilization rate and reduces fertilization frequency.

Q2: How to achieve long slow-release cycle with low dosage?

The optimized bio-based PU formula has excellent film-forming and barrier properties. A coating dosage of 1%-3% can form a uniform ultra-thin dense film, effectively locking nutrients and maintaining a stable slow-release period of more than 60 days.

Q3: Is this urea slow-release coating agent environmentally friendly?

Yes. The solvent-free bio-based formula contains no heavy metals or harmful substances. The coating film can be naturally degraded in soil, fully complying with EU biodegradability and agricultural environmental protection standards.

Q4: What production equipment is suitable for this coating agent?

It is compatible with thermal rotary drum and hot-air spouted bed coating equipment, supporting efficient and continuous mass production of various granular slow-release urea fertilizers.

Q5: What factors affect the slow-release effect of coated urea?

Coating dosage, coating layers, preheating temperature of urea particles and uniform film-forming effect will affect the final slow-release performance. Strictly following the recommended process parameters can ensure stable and long-lasting nutrient release.