Insecticide-Coated EPS Particles Abrasion Resistance
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Solution Overview
Problem
Existing methods for incorporating insecticides into expandable polystyrene (EPS) particles in construction materials lead to undesirable exposure and loss of active ingredients due to abrasion and dust formation during production and use, compromising both efficacy and safety.
Innovation Solution
Coating EPS particles with a combination of insecticides, glycerol esters, and optional binders and additives to enhance abrasion resistance and insecticidal effectiveness, reducing the amount of insecticide needed while maintaining mechanical and insulation properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If insecticides are incorporated into EPS particles by surface coating methods (applying to finished molded part, pre-foamed foam particles, or granules), then insecticidal protection is achieved, but abrasion and dust formation occur during production leading to exposure and loss of active ingredient
Solution Approach 1:
The patent applies preliminary action by coating the EPS granules with insecticide and binder mixture before the foaming process. This ensures the coating is applied to the dense granule material rather than the finished foam, preventing abrasion and dust formation that would otherwise occur during subsequent handling and installation of the molded parts. The coating is established in advance when the material is in a more manageable, less porous state.
Solution Approach 2:
The patent employs parameter changes by utilizing the specific physical state and surface properties of EPS granules before foaming. The granules have a dense, compact structure with controlled porosity that provides better adhesion for the coating. By applying the coating at this intermediate state rather than on finished foam or pre-foamed particles, the coating adheres more effectively and resists abrasion during subsequent processing.
2Reliability
If higher concentrations of insecticide are used to ensure adequate protection, then insecticidal effectiveness is improved, but exposure and loss of active ingredient during production and use increases
Solution Approach 1:
By applying the insecticide coating preliminarily to the granules before foaming, the patent achieves more efficient incorporation and distribution of the active ingredient. This preliminary application ensures uniform coverage that is then locked into the foam structure during expansion, maximizing effectiveness while minimizing the total amount of insecticide needed compared to surface application methods on finished products.
Solution Approach 2:
The patent exploits the parameter changes in the EPS material state to optimize insecticide incorporation. The granule structure before foaming provides optimal conditions for coating adhesion and uniform distribution. This results in more efficient use of the active ingredient with better penetration and distribution throughout the final foam product, reducing the need for high concentrations.
3Reliability
If conventional coating methods are used on EPS particles, then insecticidal protection is provided, but abrasion resistance of the coating is poor leading to dust formation during production and use
Solution Approach 1:
The patent applies the coating preliminarily to the granules before the foaming process. This timing is critical because the granule surface provides better mechanical interlocking and adhesion properties. The coating is set into the granule structure before expansion, creating a more robust bond that resists abrasion during handling, installation, and service life of the insulation material.
Solution Approach 2:
The patent utilizes the parameter changes in EPS material state to achieve superior coating adhesion. The unfoamed granules have a dense, compact structure with specific surface characteristics that enhance binder attachment. After foaming, the coating becomes integrated into the foam matrix, providing excellent abrasion resistance that conventional surface coating methods on finished foam cannot achieve.
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 coated EPS particles demonstrate improved abrasion resistance and enhanced insecticidal effectiveness, reducing the amount of insecticide required and minimizing exposure and loss, resulting in a more economical and ecological coating process without compromising mechanical or insulation properties.
Implementation Method 1
The processes mentioned can lead to undesirable abrasion and dust formation during production
Implementation Method 2
the compact is hardened by heating to 20 to 100 ° C
Implementation Method 3
foaming the filled particles in the closed mold by tempering them to 60 to 120 ° C
Data Source
AI summary
Particles, which are equipped with insecticide, made of expandable polystyrene (EPS) coated with: A) one or more insecticides, B) one or more glycerin esters, C) optionally one or more binders, and D) optionally further additives.