Antifouling Sheet With Gradient Photocatalyst Layer
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Solution Overview
Problem
Existing antistaining sheets face challenges in maintaining effective antistaining properties over a long period without forming a thick antistaining layer, as the self-collapse of the antistaining layer proceeds rapidly, leading to premature degradation and inadequate stain removal, especially with inorganic stains like sand and metal rust.
Innovation Solution
The antistaining sheet features a multi-layer structure with a surface layer having a higher photocatalyst content and faster thermoplastic resin decomposition than the inner layer, ensuring strong self-collapsing properties on the surface while maintaining antistaining performance over time without excessive thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the self-collapsing property of the antistaining layer is enhanced to achieve rapid antistaining effect, then the antistaining property is improved, but the layer collapses too quickly and loses its function
Solution Approach 1:
The antistaining layer is divided into multiple sub-layers with different photocatalyst contents. The surface layer has higher photocatalyst content for rapid initial antistaining effect, while the lower layer has lower photocatalyst content for sustained long-term performance, resolving the contradiction between quick action and durability
Solution Approach 2:
Different regions of the antistaining layer are given different properties: the surface layer is designed with high photocatalyst concentration for aggressive stain decomposition, while the base layer maintains lower concentration for stability and extended service life, allowing each region to perform its specific function optimally
2Duration of action of stationary object
If the antistaining layer is made thick to ensure long-term performance, then the service life is extended, but manufacturing complexity and cost increase
Solution Approach 1:
Instead of using a single thick layer, the system segments the functionality into multiple thinner sub-layers with distinct photocatalyst concentrations. This achieves the same total photocatalyst content and service life as a thick layer but simplifies manufacturing processes and reduces material costs
Solution Approach 2:
The invention changes the parameter distribution of photocatalyst content across the layer thickness rather than uniformly increasing overall thickness. By optimizing the concentration gradient from surface to base, the system achieves extended service life through parameter optimization rather than increased dimensional complexity
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
This design enables rapid development of antistaining effects at the start of use and sustained performance over the product's lifetime, preventing premature layer collapse and effectively removing organic stains while managing inorganic stains through controlled layer degradation.
Implementation Method 1
the photocatalyst receives photoenergy when the antistaining layer is irradiated with light such as sunlight, exposes the photocatalyst itself onto the surface of the antistaining layer while decomposing the thermoplastic resin present as surrounding the photocatalyst
Implementation Method 2
decomposing the thermoplastic resin that is decomposed by the redox action of the photocatalyst
Implementation Method 3
the photocatalytic effect increases the hydrophilicity of the sheet surface and consequently the stains are cleaned with rain water or the like
Data Source
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AI summary
Disclosed is an antistaining sheet including a base material sheet and an antistaining layer formed on the base material sheet. The antistaining layer includes a photocatalyst and a thermoplastic resin to be decomposed by the photocatalyst, and thus has a self-collapsing property. The antistaining layer is stronger in self-collapsing property in the surface portion thereof than in the interior portion.