Laminated Sheet Binder Copolymer Adhesion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Laminated sheets comprising glass fiber cloths and fluororesin films face issues with transparency and durability due to the low adhesive properties of commonly used binders, which lead to deformation and poor long-term performance under outdoor conditions.
Innovation Solution
A laminated sheet is developed using a binder copolymer with repeating units based on fluoromonomers and non-fluoromonomers, such as tetrafluoroethylene and vinyl ethers, which maintains adhesive properties and durability even after drying, allowing for high transparency and resistance to deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a commonly used binder (melamine resin, acrylic-melamine resin, acrylic resin, ethylene/vinyl acetate resin) is applied to glass fiber cloth to prevent slippage, then the glass fibers are fixed effectively, but the binder lacks adhesive properties after drying, causing deformation and poor durability under outdoor conditions
Solution Approach 1:
The patent changes the chemical composition parameters of the binder by using a copolymer containing fluoromonomer units (tetrafluoroethylene, chlorotrifluoroethylene, or hexafluoropropylene) combined with specific non-fluoromonomer units (vinyl ether, vinyl ester, isopropenyl ether, isopropenyl ester, allyl ether, or allyl ester). This compositional parameter change provides both adequate adhesion and durability under outdoor conditions.
Solution Approach 2:
The patent creates a composite binder material by copolymerizing fluoromonomers with specific non-fluoromonomers. The fluoromonomer component provides durability and resistance to environmental degradation, while the non-fluoromonomer component (particularly vinyl ethers and vinyl esters) provides adhesive properties. This composite approach resolves the contradiction between adhesion and durability.
2Illumination intensity
If the open area ratio of glass fiber cloth is increased to improve transparency, then light transmission improves, but the strength to maintain the structure of the glass fiber cloth decreases
Solution Approach 1:
The patent optimizes the binder composition parameters to achieve adequate adhesion with minimal binder quantity. The copolymer's specific molecular structure allows effective bonding at lower concentrations, enabling high open area ratio cloth to maintain structural integrity while maximizing transparency.
3Strength
If the thickness of the fluororesin film is increased to improve strength for typhoon and monsoon resistance, then wind load resistance improves, but the transparency and building cost advantages are reduced
Solution Approach 1:
The patent uses glass fiber cloth as a reinforcement composite within the fluororesin film structure. The glass fiber cloth provides the primary strength to resist wind loads from typhoons and monsoons, while the fluororesin film provides weather resistance and transparency. This composite structure allows thinner films to achieve the required strength, maintaining both transparency and cost advantages.
4Strength
If several layers of fluororesin films are overlaid to improve strength, then wind resistance improves, but the building cost increases and design freedom is reduced
Solution Approach 1:
The patent employs a composite structure where glass fiber cloth is integrated within the fluororesin film to provide reinforcement. This single-layer composite achieves the strength of multiple overlaid films while reducing complexity and cost. The glass fiber reinforcement allows the film to resist wind loads without requiring multiple layers.
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 provides a laminated sheet with improved transparency, durability, and resistance to deformation, making it suitable for outdoor use as a covering material for agricultural greenhouses and other film structures.
Implementation Method 1
a binder contains a copolymer (A) having repeating units (a1) based on at least one fluoromonomer selected from the group consisting of tetrafluoroethylene, chlorotrifluoroethylene and hexafluoropropylene, and repeating units (a2) based on at least one non-fluoromonomer selected from the group consisting of a vinyl ether, a vinyl ester, an isopropenyl ether, an isopropenyl ester, an allyl ether and an allyl ester
Data Source
Figure 1~3
AI summary
To provide a laminated sheet which has high transparency and withstands long outdoor use, comprising a glass fiber cloth which is free from deformation of the cloth even in a step of bonding the cloth to a fluororesin film. A laminated sheet comprising a woven or nonwoven fabric comprising glass fibers fixed by a binder, and a fluororesin film laminated on each other, wherein the binder contains a copolymer (A) having repeating units (a1) based on at least one fluoromonomer selected from the group consisting of tetrafluoroethylene, chlorotrifluoroethylene and hexafluoropropylene, and repeating units (a2) based on at least one non-fluoromonomer selected from the group consisting of a vinyl ether, a vinyl ester, an isopropenyl ether, an isopropenyl ester, an allyl ether and an allyl ester.