Antifogging Laminate Body With Storage and Buffer Layers
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Solution Overview
Problem
Existing laminated bodies using epoxy resin for antifogging applications face a trade-off between mechanical strength and antifogging properties, with increasing inorganic particle content improving mechanical strength but deteriorating antifogging properties, and decreasing particle content enhancing antifogging properties but compromising mechanical strength.
Innovation Solution
A laminated body structure comprising a substrate, a storage layer formed from a composition containing polyfunctional monomers and inorganic particles, and a buffer layer with a specific distribution of inorganic particles and polyfunctional monomers, where the buffer layer has a higher inorganic particle content than the storage layer, and includes a surfactant to enhance hydrophilicity and maintain antifogging properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the content mass of inorganic particles is increased to improve mechanical strength, then mechanical strength is improved, but antifogging properties are deteriorated
Solution Approach 1:
The patent divides the coating into two distinct layers: a storage layer that contains inorganic particles for mechanical strength, and a buffer layer that provides antifogging properties through hydrophilic resin. This segmentation allows each layer to be optimized for its specific function without compromising the other, resolving the contradiction between mechanical strength and antifogging properties.
Solution Approach 2:
The patent applies different compositions to different regions of the coating. The storage layer has high inorganic particle content (30-70% by mass) for mechanical strength, while the buffer layer has lower inorganic particle content (0-30% by mass) with higher hydrophilic resin content for antifogging. This local differentiation allows simultaneous optimization of both properties.
2Reliability
If the content mass of inorganic particles is decreased to maintain antifogging properties, then antifogging properties are maintained, but mechanical strength becomes insufficient
Solution Approach 1:
By separating the coating into a storage layer and a buffer layer, the patent allows the storage layer to provide mechanical strength through high inorganic particle content while the buffer layer maintains antifogging properties through hydrophilic resin. This segmentation enables both requirements to be met simultaneously.
Solution Approach 2:
The patent uses composite materials with different compositions in each layer. The storage layer uses a composite with high inorganic particle content for strength, while the buffer layer uses a composite with hydrophilic resin for antifogging. This composite approach allows both properties to coexist in the overall coating system.
3Device complexity
If a single-layer structure is used, then the structure is simple, but it is difficult to achieve both favorable mechanical strength and high antifogging properties
Solution Approach 1:
The patent segments the single coating layer into two functional layers: a storage layer for mechanical strength and a buffer layer for antifogging properties. This segmentation increases structural complexity but enables simultaneous achievement of both performance requirements, which cannot be achieved in a single-layer structure.
Solution Approach 2:
The patent employs composite materials with different compositions in each layer. The storage layer uses a composite optimized for mechanical strength, while the buffer layer uses a composite optimized for antifogging. This composite material approach enables performance balance that would be difficult to achieve in a homogeneous single-layer 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 laminated body achieves a balance of favorable mechanical strength and excellent antifogging properties by optimizing the distribution and composition of inorganic particles and polyfunctional monomers, ensuring effective moisture absorption and retention.
Implementation Method 1
the buffer layer contains no surfactant, or a content mass of a surfactant (b3) with respect to the total mass of the buffer layer (B) is from more than 0% by mass to less than 1.0% by mass, and each of the surfactant (a3) and the surfactant (b3) independently has a polyoxyalkylene structure
Implementation Method 2
the buffer layer (B) is formed of a cured product of a composition (B-1) containing: a polyfunctional monomer (b1) containing two or more epoxy groups; and inorganic particles (b2)
Data Source
AI summary
A laminated body including: a substrate; a storage layer; and a buffer layer disposed in this order, in which the storage layer is formed of a cured product of a composition containing a polyfunctional monomer (a1), inorganic particles (a2), and a surfactant (a3), the buffer layer is formed of a cured product of a composition containing a polyfunctional monomer (b1) and inorganic particles (b2), a content mass of the inorganic particles (a2) is 30% by mass or more, a content mass of the inorganic particles (b2) is 30% by mass or more, and the polyfunctional monomer (a1) and the polyfunctional monomer (b1) contain a polyfunctional monomer having a molecular weight per epoxy group in one molecule of 200 g/mol or more.