Sustained Release Pheromone Membrane Permeation Control
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Solution Overview
Problem
Existing sustained release pheromone preparations for pest insect control face challenges in maintaining a constant ratio of unsaturated aliphatic acetate and alcohol compounds over time due to differences in affinity with polyolefin membranes, leading to uneven release rates and reduced effectiveness in disrupting pest insect mating.
Innovation Solution
A sustained release pheromone preparation using a mixture of unsaturated aliphatic acetate and alcohol compounds in a specific weight ratio, enclosed in a container with a polyester membrane or copolymer corresponding to Formula (I), which maintains a consistent residual weight percentage of both components throughout the effective action period, ensuring a stable release ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyolefin membrane is used for sustained release preparation, then stability against sex pheromone and processability are improved, but the release ratio of acetate and alcohol compounds varies over time due to different membrane permeation rates
Solution Approach 1:
The patent changes the material parameter of the container membrane from polyolefin to polyester, which has different permeation characteristics. This parameter change allows both acetate and alcohol compounds to permeate at comparable rates, maintaining a constant release ratio over time while preserving stability and processability
Solution Approach 2:
The patent uses a composite container structure comprising polyester membrane and fillers, creating a material system with optimized permeation properties. This composite approach enables controlled release of multiple pheromone components at consistent ratios while maintaining structural integrity
2Ease of manufacture
If polyolefin membrane is used for sustained release preparation, then processability is improved, but the alcohol compound permeation rate becomes markedly smaller than acetate compound due to low affinity
Solution Approach 1:
The patent changes the membrane material from polyolefin to polyester, fundamentally altering the chemical affinity parameters. Polyester provides appropriate interaction with both acetate and alcohol compounds, enabling the alcohol compound to permeate at a rate comparable to the acetate compound
3Reliability
If mixture of acetate and alcohol compounds is enclosed in container, then species-specific mating disruption is achieved, but the component ratio in remaining mixture varies throughout effective action period
Solution Approach 1:
The patent changes the release kinetics parameter by selecting polyester membrane with appropriate permeation characteristics. This ensures that both acetate and alcohol compounds are released at comparable rates, maintaining the natural component ratio in the remaining mixture throughout the effective action period
Solution Approach 2:
The polyester membrane acts as an intermediary that mediates the release process, controlling the permeation of both pheromone components to maintain their natural ratio. The membrane serves as a selective barrier that enables species-specific disruption while preserving compositional stability
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 solution ensures a consistent release ratio of the pheromone components, effectively disrupting pest insect mating by maintaining the target species-specific ratio, thereby reducing the birth rate of the next generation over the emergence period of the pest insect.
Implementation Method 1
the permeation rate through a polyolefin membrane differs largely between an unsaturated aliphatic acetate compound and an unsaturated aliphatic alcohol compound
Data Source
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AI summary
Provided is a sustained release pheromone preparation for controlling a pest insect containing, as sex pheromone components, an unsaturated aliphatic acetate and an unsaturated aliphatic alcohol having a structure where the acetyl group of the acetate is replaced with a hydrogen atom, wherein a ratio between the acetate and the alcohol in the mixture solution contained in the sustained release pheromone preparation can be kept constant throughout the effective action period. More specifically, provided is the preparation including a mixture solution containing the unsaturated aliphatic acetate and the unsaturated aliphatic alcohol in a weight ratio of 10:90 to 99.5 to 0.5 and a container for enclosing the mixture solution, the container containing, as at least a part of the container, a membrane of a polyester corresponding to Formula (I) below, a copolymer thereof, or a polymer blend of the polyester or copolymer with a biodegradable polyester.