Biodegradable Fertilizer Coating Resin for Controlled Nutrient Release
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing slow-release fertilizers coated with non-degradable materials pose risks of microplastic contamination in soil and water systems, and biodegradable alternatives struggle with controlling release rates and uniform coating.
Innovation Solution
A resin composition for coating fertilizers, comprising biodegradable polyester resins with specific crystallinity and molecular weight ratios, along with optional slip agents and amide-based activators, to achieve controlled release and improved coating processability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-degradable materials (PE, PVA, PVDC, polyurethane) are used as coating materials, then the release rate of fertilizer can be controlled, but microplastic pollution occurs in soil and water systems
Solution Approach 1:
The patent changes the chemical composition parameters of the coating material from non-degradable polymers to biodegradable polyester resins with specific molecular structures (diol-derived units, aliphatic dicarboxylic acid-derived units, and aromatic dicarboxylic acid-derived units). This parameter change maintains fertilizer release control through regulated biodegradation while eliminating microplastic pollution by ensuring complete biological decomposition of the coating material.
Solution Approach 2:
The patent employs composite resin composition containing multiple biodegradable polyester resin components with different crystallinities (10-60%). This composite structure combines the advantages of different resin types to achieve both controlled fertilizer release and complete biodegradability, resolving the contradiction between reliability and environmental harm.
2Object-generated harmful factors
If biodegradable materials are used as coating materials, then microplastic pollution is reduced, but it is difficult to control the release rate of fertilizer
Solution Approach 1:
The patent introduces specific parameter controls for the biodegradable polyester resin including number average molecular weight (20,000-100,000 g/mol) and crystallinity (10-60%). These parameter specifications enable precise control over the biodegradation rate and consequently the fertilizer release rate, while maintaining complete biodegradability to prevent microplastic pollution.
Solution Approach 2:
The patent creates local quality variations within the coating by incorporating resins with different crystallinities (first resin: 10-30%, second resin: 27-60%). This local quality differentiation allows different regions of the coating to degrade at different rates, providing controlled and sustained fertilizer release while ensuring complete biodegradation.
3Object-generated harmful factors
If biodegradable materials are used as coating materials, then microplastic pollution is reduced, but uniform coating is difficult to achieve and adhesion occurs between materials
Solution Approach 1:
The patent specifies the viscosity of the resin composition (50-150 cPs under defined measurement conditions) to optimize coating processability. This viscosity control ensures uniform coating application while preventing adhesion between coating materials, resolving the manufacturing precision issues associated with biodegradable materials.
Solution Approach 2:
The patent introduces a slip agent as an intermediary substance in the resin composition. This slip agent acts as a mediator to prevent adhesion between biodegradable coating materials during the coating process, enabling uniform coating application while maintaining the biodegradability of the primary coating material.
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 resin composition ensures biodegradability, controlled release rates, and uniform coating, reducing microplastic pollution while maintaining effective fertilizer delivery.
Implementation Method 1
a first biodegradable polyester resin including a diol-derived unit, an aliphatic dicarboxylic acid-derived unit, and an aromatic dicarboxylic acid-derived unit
Implementation Method 2
the resin composition has a crystallinity of 10 % to 60 % as measured by differential scanning calorimetry (DSC)
Data Source
AI summary
Disclosed are a resin composition for coating a fertilizer and a slow-release fertilizer including the same, wherein the resin composition includes the first biodegradable polyester resin including a diol-derived unit, an aliphatic dicarboxylic acid-derived unit, and an aromatic dicarboxylic acid-derived unit, wherein the resin composition has a crystallinity of 10 % to 60 % as measured by differential scanning calorimetry (DSC).