Aqueous Pest Control Composition Transparency Stability
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Solution Overview
Problem
Aqueous pest control compositions containing pyrethroid compounds often exhibit turbidity due to the low solubility of pyrethroid compounds in water, leading to stability issues during long-term storage, which affects their transparency and appearance when stored in transparent containers.
Innovation Solution
An aqueous pest control composition comprising 0.01 to 2% pyrethroid compound, 1 to 40% polypropylene glycol monopropyl ether, 5 to 40% water-soluble organic solvent, and 20 to 80% water, with a formulation additive of 5% by weight or less, which stabilizes the composition and maintains high transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If pyrethroid compound is emulsified in aqueous solvent as microdroplet, then composition can be formulated with water as main solvent, but composition exhibits turbidity and low transparency after long-term storage
Solution Approach 1:
The patent applies parameter changes by carefully controlling the particle diameter of pyrethroid microdroplets within 0.01 to 1.0 μm range and maintaining specific compositional parameters (pyrethroid 0.01-2%, propyl ether 1-40%, water-soluble organic solvent 5-40%). This parameter optimization prevents microdroplet aggregation and maintains transparency stability during long-term storage while enabling aqueous formulation.
Solution Approach 2:
The patent uses propyl ether (dipropylene glycol monopropyl ether or tripropylene glycol monopropyl ether) as an intermediary substance to stabilize the pyrethroid microdroplets in aqueous solution. This intermediary prevents microdroplet coalescence and maintains uniform dispersion, thereby preventing turbidity and maintaining transparency during storage.
2Ease of manufacture
If particle diameter of microdroplet is increased, then easier to formulate, but composition exhibits slight turbidity in appearance
Solution Approach 1:
The patent optimizes the particle diameter parameter to a specific range (0.01 to 1.0 μm) that balances formulation ease with transparency maintenance. This controlled particle size allows practical formulation while preventing light scattering that causes turbidity, thus maintaining high appearance transparency.
3Quantity of substance
If pyrethroid compound is dissolved in organic solvent, then solubility is improved, but composition cannot be classified as aqueous formulation
Solution Approach 1:
The patent employs propyl ether as an intermediary emulsifying agent that enables pyrethroid compound to be dispersed in aqueous solvent without requiring large amounts of traditional organic solvents. This intermediary facilitates solubility enhancement while maintaining the aqueous formulation classification and associated safety advantages.
Solution Approach 2:
The patent creates a composite aqueous formulation system combining water, propyl ether, water-soluble organic solvent, and pyrethroid compound. This composite material approach achieves effective pyrethroid solubility and stability while maintaining the formulation as an aqueous-based product, combining benefits of both aqueous and organic systems.
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 composition achieves excellent long-term storage stability and high transparency, making it suitable for use in transparent containers as liquid mosquito repellents or hand pump sprays, effectively controlling various pests.
Implementation Method 1
the pyrethroid compound (or a liquid in which a pyrethroid compound is dissolved in an organic solvent) is emulsified (dispersed) in an aqueous solvent in the form of a microdroplet
Implementation Method 2
5 to 40% by weight of a water-soluble organic solvent which is at least one selected from the group consisting of glycol monoalkyl ether having 7 or less carbon atoms and glycol having 9 or less carbon atoms
Data Source
AI summary
An aqueous pest control composition is provided consisting of: a) 0.01 to 2% by weight of a pyrethroid compound; b) 1 to 40% by weight of polypropylene glycol monopropyl ether which is at least one selected from the group consisting of dipropylene glycol monopropyl ether and tripropylene glycol monopropyl ether; c) 5 to 40% by weight of a water-soluble organic solvent which is at least one selected from the group consisting of glycol monoalkyl ether having 7 or less carbon atoms and glycol having 9 or less carbon atoms; d) 20 to 80% by weight of water; and e) 5% by weight or less of a formulation additive.