Bio-FDCA Polyurethane Coating for Controlled Release Fertilizer
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Solution Overview
Problem
Existing bio-based polyurethane controlled release fertilizers face challenges with short release periods and high production costs due to weak hydrophobic performance and complex preparation processes, limiting their application and ecological safety.
Innovation Solution
A renewable material-based furandicarboxylic acid (Bio-FDCA) coating material is introduced, which enhances hydrophobicity and biodegradability through a cross-linking reaction with polyester polyol and isocyanate, improving the controlled release period and ecological safety while reducing material usage and production costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If lactic acid is used to prepare the coating material, then the coating material can be prepared with bio-based materials, but the hydrophobic performance is weak and the controlled release period is short
Solution Approach 1:
The patent changes the chemical structure parameters of the polyol by using furandicarboxylic acid instead of lactic acid, which fundamentally alters the hydrophobicity and molecular weight characteristics of the coating material, thereby extending the controlled release period while maintaining bio-based status
Solution Approach 2:
The patent creates a composite coating material system combining furandicarboxylic acid with specific diols and catalysts, forming a new bio-based polyester polyol that achieves both hydrophobicity and extended release period through synergistic material composition
2Duration of action of moving object
If the coating rate is increased to extend the controlled release period, then the release period can be extended, but the production cost increases
Solution Approach 1:
The patent changes the intrinsic properties of the coating material through molecular structure modification (using furandicarboxylic acid with higher molecular weight and better hydrophobicity), which allows achieving extended release periods at lower coating rates, thereby reducing material consumption and production costs
3Strength
If phthalic acid is introduced to improve mechanical properties and water resistance, then the mechanical strength and water resistance are improved, but the hydrophobic property is weak and the release period is short
Solution Approach 1:
The patent fundamentally changes the chemical structure from aromatic (phthalic acid) to heterocyclic (furandicarboxylic acid), which simultaneously improves hydrophobicity, water resistance, and extends the release period while maintaining mechanical strength through the rigid furan ring structure
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 Bio-FDCA coating material extends the controlled release period of polyurethane fertilizers, offering high hydrophobicity and ecological safety, reducing material costs, and enabling mass production with improved performance and biocompatibility.
Implementation Method 1
prepared by performing cross-linking reaction between at least one polyester polyol and at least one isocyanate
Data Source
AI summary
A renewable material-based furandicarboxylic acid (Bio-FDCA) coating material of a polyurethane controlled release fertilizer is prepared by performing cross-linking reaction between at least one polyester polyol and at least one isocyanate, wherein the polyester polyol is made from the Bio-FDCA. Moreover, a method for preparing a polyurethane controlled release fertilizer includes by spraying the coating material on a surface of granular fertilizer, forming a layer of film after cross-linking in situ on the surface of the granular fertilizer, so as to obtain the polyurethane controlled release fertilizer. In the present invention, it is the first time to introduce the furan ring structure into the coating material of the polyurethane controlled release fertilizer, and the Bio-FDCA is taken as the source of the furan ring structure.