Cellulose Ester Multilayer Interlayers for Structural Laminates
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Solution Overview
Problem
Current interlayers used in structural laminates, such as those in architectural and automotive applications, face challenges in providing sufficient structural support while maintaining optical clarity and clarity of glass panels, as many commercially available PVB interlayers exhibit deficiencies in processability and functionality.
Innovation Solution
A multilayer interlayer comprising a non-cellulose ester layer, specifically an ethylene vinyl acetate resin, combined with a cellulose ester layer having a hydroxyl content of at least 0.5 weight percent and a glass transition temperature of at least 50°C, which enhances structural support and maintains optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If PVB interlayers are used to provide structural support in laminated glass, then stiffness and load bearing ability are improved, but optical clarity and aesthetic appeal deteriorate
Solution Approach 1:
The patent employs a composite interlayer structure combining PVB (polyvinyl butyral) with cellulose ester layers. This composite approach allows the PVB to provide structural support and stiffness while the cellulose ester layers maintain optical clarity and aesthetic properties, resolving the contradiction between structural performance and optical quality.
Solution Approach 2:
The interlayer is designed with different layers serving different functions: the PVB layer provides structural stiffness and load-bearing capacity, while the cellulose ester layers provide optical clarity and aesthetic appearance. This local differentiation of material properties allows simultaneous optimization of both structural and optical performance.
2Strength
If PVB interlayers are used to enhance structural support, then load bearing ability is improved, but processability and functionality deteriorate
Solution Approach 1:
The composite structure of PVB and cellulose ester provides both structural performance and improved processability. The cellulose ester layers can be processed and laminated more easily than pure PVB, while still achieving the desired load-bearing capacity through the PVB component.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the interlayer materials, specifically using cellulose ester with controlled crystallinity and molecular weight, to achieve a balance between structural strength and processability in the manufacturing process.
3Illumination intensity
If glass thickness is reduced to maintain aesthetic appeal, then optical clarity is improved, but structural support capability deteriorates
Solution Approach 1:
The composite interlayer structure compensates for reduced glass thickness by providing enhanced structural support at the interlayer level. The PVB-cellulose ester composite can bear higher loads, allowing thinner glass panes to be used while maintaining overall structural integrity and aesthetic appearance.
Solution Approach 2:
The patent shifts the structural support function from the glass panes themselves to the interlayer material, effectively moving the load-bearing dimension from the rigid glass to the flexible composite interlayer, enabling thinner glass while maintaining strength.
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 proposed interlayer solution provides superior stiffness and adhesion to glass and other materials, enabling structural support while preserving the optical clarity and aesthetic appeal of glass panels, suitable for emerging applications requiring stiffer interlayers.
Implementation Method 1
provides superior stiffness and adhesion to glass and other materials
Implementation Method 2
a glass transition ('Tg') temperature of at least 50° C.
Data Source
AI summary
An interlayer structure having a cellulose ester layer for use in structural laminates is described herein. The cellulose ester layer provides rigidity and support to multilayer interlayers comprising an array of different layers. Due to the diverse properties of the cellulose ester layers, the present interlayers can be useful in producing structural laminates having high stiffness and which possess good optical clarity for a variety of applications, including outdoor structural applications.