Encapsulation compositions
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Solution Overview
Problem
There is a need for improved encapsulation materials that allow for the releasable encapsulation of pyrethroids, particularly in protecting them from oxidation and volatile losses while maintaining control over the release rate.
Innovation Solution
The use of amphiphilic materials with well-balanced hydrophilic and hydrophobic moieties to encapsulate pyrethroids, forming capsules with a hydrophilic-lipophilic balance (HLB) of 11 to 20, which are stabilized by noncovalent forces such as dipole, hydrogen bonding, and electrostatic interactions, and can be polymers like graft or block copolymers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pyrethroids are encapsulated by conventional materials, then protection from oxidation and volatile losses is improved, but release rate control is insufficient
Solution Approach 1:
The patent adjusts the hydrophilic-lipophilic balance (HLB) parameter of the encapsulating material to control the release rate. By selecting amphiphilic materials with specific HLB values (11-20), the invention optimizes both protection and controlled release characteristics, resolving the contradiction between protection reliability and release control adaptability.
Solution Approach 2:
The invention uses composite amphiphilic materials comprising both hydrophilic and hydrophobic moieties. This composite structure provides a dual-function system where the hydrophobic portion protects the pyrethroid from oxidation and volatile losses, while the hydrophilic portion enables controlled release through regulated interaction with the aqueous environment.
2Adaptability or versatility
If amphiphilic materials with HLB 11-20 are used, then release rate control is improved, but material complexity increases
Solution Approach 1:
The amphiphilic material exhibits local quality differentiation with distinct hydrophilic and hydrophobic regions. This local differentiation allows the material to perform multiple functions (protection and controlled release) simultaneously without requiring complex overall structure, as each region contributes its specific property to the encapsulation system.
3Device complexity
If conventional encapsulation materials are used, then material simplicity is maintained, but protection effectiveness against oxidation and volatility is insufficient
Solution Approach 1:
The amphiphilic material acts as an intermediary between the hydrophobic pyrethroid and the aqueous environment. This intermediary structure provides effective protection against oxidation and volatile losses by creating a protective interface, while maintaining relatively simple material composition and 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 encapsulation provides controlled release rates of pyrethroids, enhancing stability and reducing volatility, with release rates as low as 0.2-0.6 mg/day, and can be applied to fabrics for coatings.
Implementation Method 1
The association of the material onto the pyrethroid may be driven by one or a combination of noncovalent forces such as dipole, hydrogen bonding, van der Waals, electrostatic, cation-pi electron interaction, or hydrophobic effects.
Implementation Method 2
The association of the material onto the pyrethroid may be driven by one or a combination of noncovalent forces such as dipole, hydrogen bonding, van der Waals, electrostatic, cation-pi electron interaction, or hydrophobic effects.
Implementation Method 3
The association of the material onto the pyrethroid may be driven by one or a combination of noncovalent forces such as dipole, hydrogen bonding, van der Waals, electrostatic, cation-pi electron interaction, or hydrophobic effects.
Implementation Method 4
The pyrethroid has a release rate less than a release rate of the unencapsulated pyrethroid.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
An encapsulation composition is described. The composition comprises a plurality of capsules, each capsule comprising an amphiphilic material encapsulating a pyrethroid. The encapsulated pyrethroid has a release rate less than the release rate of the unencapsulated pyrethroid. Coated fabric products are also described.