Encapsulated Particle Polyurethane Coating Dissolution Control
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Solution Overview
Problem
Conventional encapsulated particles are brittle and prone to premature dissolution during handling, leading to unpredictable and wasteful release of core materials, which can cause phytotoxicity.
Innovation Solution
The development of an encapsulated particle with a polyurethane coating composed of a reaction product of an aromatic isocyanate component and a polyol component, specifically using an aromatic amine-based initiator and an aliphatic polyether polyol, providing improved flexibility, durability, and moisture barrier properties, thereby controlling the dissolution rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional polyurethane is used in encapsulated particles, then the particle structure is simple and easy to manufacture, but the particles become brittle and prone to damage during handling
Solution Approach 1:
The patent employs a composite polyol component consisting of two distinct polyols: a polyol derived from aromatic amine-based initiator and an aliphatic polyether polyol. This composite approach combines the beneficial properties of both polyols to achieve optimal flexibility and durability in the polyurethane coating, resolving the contradiction between simplicity and strength.
Solution Approach 2:
The patent specifies precise weight ratios for the polyol components (from about 1:2 to 2:1) and controls the functionality parameters (aromatic amine-based initiator with functionality of 4, aliphatic polyether polyol with functionality of 2 to 4). By optimizing these parameters, the invention achieves improved flexibility and durability while maintaining manufacturability.
2Reliability
If conventional polyurethane coating is used, then the manufacturing process is simple, but the particles exhibit premature dissolution and rapid release of core material
Solution Approach 1:
The patent uses a composite polyol system combining aromatic amine-based initiator-derived polyol with aliphatic polyether polyol. This composite material provides superior moisture barrier properties and controlled dissolution characteristics, preventing premature release while remaining manufacturable through standard polyurethane synthesis processes.
Solution Approach 2:
The invention optimizes the weight ratio of polyol components (1:2 to 2:1) and controls the chemical parameters (functionality of 4 for aromatic amine-based initiator, functionality of 2 to 4 for aliphatic polyether polyol) to achieve predictable dissolution rates and prevent phytotoxicity, thereby improving reliability without excessive complexity.
3Strength
If thin polyurethane coating is applied, then the dissolution rate is fast and core material is released quickly, but the coating provides insufficient protection and allows premature dissolution
Solution Approach 1:
The patent optimizes the polyol component composition and weight ratios to enhance the polyurethane coating's protective properties. The specific combination of aromatic amine-based initiator polyol and aliphatic polyether polyol creates a coating with improved integrity and controlled dissolution characteristics, extending protection time while maintaining appropriate release rates.
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 encapsulated particle exhibits enhanced flexibility, durability, and controlled dissolution, reducing waste and phytotoxicity, while maintaining the integrity of the core material during handling and release.
Implementation Method 1
The polyurethane includes the reaction product of an aromatic isocyanate component having a nominal functionality of at least 2 and a polyol component
Implementation Method 2
The combination of the polyol component derived from the aromatic amine-based initiator and the aliphatic polyether polyol provide improved compatibility with the aromatic isocyanate component, which results in a polyurethane having improved flexibility and durability. Furthermore, the encapsulated particle, which includes the aforementioned polyurethane, has improved moisture barrier properties, as well as extended and predictable dissolution rates because of the interaction of the polyol component and the aromatic isocyanate component.
Data Source
AI summary
An encapsulated particle includes a core particle and a polyurethane disposed about the core particle. The polyurethane includes the reaction product of an aromatic isocyanate component and a polyol component. The polyol component includes a polyol derived from an aromatic amine-based initiator and an aliphatic polyether polyol. The polyol derived from the aromatic amine-based initiator has a nominal functionality of 4. The aliphatic polyether polyol has a nominal functionality of from 2 to 4. The weight ratio of the polyol derived from the aromatic amine-based initiator and the aliphatic polyether polyol is from about 1:2 to 2:1. A method of forming the encapsulated particle is also provided.