Fluorinated Polymer Laminate Solar Reflectance Stability
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Solution Overview
Problem
Fluorinated polymer films used in building structures face issues with high solar transmittance and temperature due to high solar reflectance, and existing laminates with light reflection layers suffer from decreased reflectance when in contact with water, requiring a solution that maintains reflectance and prevents delamination over time.
Innovation Solution
A laminate structure comprising a substrate with a light reflection layer made of a non-curable resin composition containing a second fluorinated polymer and an aluminum pigment, and a protective layer obtained by curing a curable resin composition with a third fluorinated polymer, where the light reflection layer is disposed between the substrate and the protective layer, with specific thickness and composition to enhance durability and reflectance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a light reflection layer containing aluminum particles is provided on a fluorinated polymer film to increase solar reflectance, then the solar reflectance is improved, but the solar reflectance decreases over time when in contact with water
Solution Approach 1:
The patent applies composite materials by combining aluminum particles with fluorinated polymers having specific functional groups (carboxyl, hydroxyl, or amine groups) in the light reflection layer. This composite structure allows the aluminum particles to provide high solar reflectance while the fluorinated polymer matrix protects them from water contact, preventing the reflectance decrease that occurs with pure aluminum particles exposed to moisture.
Solution Approach 2:
The fluorinated polymer acts as an intermediary between the aluminum particles and water. The patent specifies using fluorinated polymers with functional groups that can bond to aluminum particles, creating a protective interface that prevents direct water contact with the aluminum surface, thereby maintaining solar reflectance stability over time.
2Illumination intensity
If a laminate with light reflection layer is used to increase solar reflectance, then the solar reflectance is improved, but the light reflection layer delaminates over time
Solution Approach 1:
The patent changes the chemical parameters of the resin composition by specifying fluorinated polymers with particular functional groups (carboxyl, hydroxyl, or amine groups) and controlling their content within specific ranges. These parameter changes enable chemical bonding between the light reflection layer and substrate, dramatically improving adhesion stability and preventing delamination over time.
Solution Approach 2:
The patent creates a composite resin composition combining fluorinated polymers with specific functional groups and aluminum particles. This composite structure provides both the solar reflectance function of aluminum and the adhesion stability of fluorinated polymers with bonding capabilities, resolving the delamination issue.
3Device complexity
If a film material made of a single fluorinated polymer film is used instead of two films with air layer, then the device complexity is reduced, but the light reflection layer is more exposed to water contact
Solution Approach 1:
The patent extracts and eliminates the air layer between two films, simplifying the structure to a single film. By removing the air layer that previously provided water barrier protection, the patent then compensates by incorporating water-resistant fluorinated polymers with functional groups in the light reflection layer, maintaining protection while reducing structural 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
The laminate maintains high solar reflectance over a long period while preventing delamination, offering improved weather resistance and stain resistance, and is less susceptible to moisture penetration and abrasion.
Implementation Method 1
a protective layer obtained by curing a curable resin composition containing a third fluorinated polymer having a crosslinkable group and a curing agent for curing the third fluorinated polymer
Implementation Method 2
a light reflection layer made of a non-curable resin composition containing a second fluorinated polymer and an aluminum pigment
Data Source
AI summary
To provide a laminate having characteristics of a fluorinated polymer film such as weather resistance and stain resistance, and having an increased solar reflectance by a light reflection layer, wherein the solar reflectance is less likely to decrease over a long period of time, and the light reflection layer is less likely to delaminate; and a production process thereof.A laminate 1 comprising a substrate 10 containing a first fluorinated polymer, a light reflection layer 12 made of a non-curable resin composition containing a second fluorinated polymer and an aluminum pigment, and a protective layer 14 obtained by curing a curable resin composition containing a third fluorinated polymer having a crosslinkable group and a curing agent for curing the third fluorinated polymer, wherein the light reflection layer 12 is disposed between the substrate 10 and the protective layer 14, the light reflection layer 12 has a thickness of from 0.5 to 5 μm, and the protective layer 14 has a thickness of from 0.3 to 2 μm.