Modified Fertilizer Structure with Crosslinked Polymer Coating
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Solution Overview
Problem
Conventional fertilizers release nutrients too quickly, leading to excessive application risks, contamination, and degradation, with few achieving a controlled release rate of nitrogen over one month.
Innovation Solution
A modified fertilizer structure with a core particle coated with multiple layers, including a crosslinked polymer made from iodine-reacted oil and modified fibers, to slow nutrient release, with a process involving heating oil with iodine and applying subsequent fiber and superabsorbent layers to control the release rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional fertilizers are applied to provide nutrients to plants, then plant growth needs are met, but nutrients are released too quickly causing contamination and degradation
Solution Approach 1:
The patent applies a coating layer comprising crosslinked polymer made from reacting an oil in the presence of iodine onto the fertilizer granule surface. This thin film acts as a controlled release barrier, allowing nutrients to diffuse through at a regulated rate over approximately one month, preventing rapid release into water systems while maintaining plant availability.
Solution Approach 2:
The invention creates a composite structure with a fertilizer core (containing nitrogen, phosphorus, potassium, and micronutrients) surrounded by a polymer coating layer. This composite design combines the nutrient-providing function of conventional fertilizers with the controlled release properties of the crosslinked polymer matrix, achieving both productivity and environmental protection.
2Quantity of substance
If fertilizer release rate is increased to meet plant growth demands, then plant nutrition is improved, but loss of nutrients through leaching and evaporation increases
Solution Approach 1:
The coating system provides dynamic control of nutrient release, adjusting the release rate in response to environmental conditions such as moisture and temperature. The crosslinked polymer structure allows controlled diffusion of nutrients over time, matching release rates to plant uptake demands while minimizing losses through leaching and evaporation.
Solution Approach 2:
The fertilizer is pre-coated with the crosslinked polymer layer before application to the field. This preliminary protective action ensures that nutrients are released in a controlled manner from the moment of application, preventing premature loss through leaching and evaporation while maintaining availability for plant uptake over the growing season.
3Reliability
If coating is applied to control nutrient release, then release rate is improved, but manufacturing complexity increases
Solution Approach 1:
The patent specifies particular parameter ranges for the coating material: iodine value of at least 117, viscosity of 400-900 centipoise, and degree of crosslinking of at least 5%. These defined parameters standardize the coating properties, ensuring reliable controlled release performance while providing clear manufacturing specifications that simplify the coating process.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The modified fertilizer achieves a controlled release of 90% nitrogen over one month, reducing excessive application risks and nutrient degradation, while maintaining soil accessibility for plant roots and leaves.
Implementation Method 1
a first layer comprising a crosslinked polymer made from reacting an oil in the presence of iodine
Implementation Method 2
the polymer having an iodine value of at least 117, a viscosity of between about 400 centipoise and about 900 centipoise and a degree of crosslinking of at least 5%
Implementation Method 3
release nutrients to the soil and to the plants at a controlled rate
Implementation Method 4
releases 90% of the nitrogen to the soil that is accessible to the plant roots and leaves over a period of about one month
Data Source
AI summary
A modified fertilizer structure and a process for making the structure are disclosed. The structure contains at least a first modified oil layer that coats the fertilizer particle. Additional layers may be added as necessary to include a modified fiber layer that coats the modified oil layer, a second and third modified oil layers, a second modified fiber layer, a layer of diatomaceous earth mineral particles and a superabsorbent layer. The structure may be constructed by placing fertilizer particles in a rotating drum, then adding the materials for each layer consecutively into the drum at appropriate conditions. The modified fertilizer structure is configured to gradually release the nutrients into the soil over a desired period of time.