Laminated Glass Interlayer Film Transparency via Hydroxyl Control
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Solution Overview
Problem
The reuse of interlayer films for laminated glass can lead to reduced transparency due to the presence of thermoplastic resins like polyvinyl acetal resin, and combining different polyvinyl acetal resins further complicates achieving optimal transparency.
Innovation Solution
An interlayer film is created by mixing a first polyvinyl acetal resin with a second polyvinyl acetal resin and a plasticizer, where the absolute difference in hydroxyl group content between the two resins is limited to 13% or less, ensuring the second resin is between 0.1% to 10% by weight, and the plasticizer content is between 40% to 80% by weight relative to the second resin, enhancing transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If an interlayer film is reused as a part of the raw material of a new interlayer film for laminated glass, then the environmental load is reduced, but the transparency of the interlayer film is lowered
Solution Approach 1:
The invention changes the chemical composition parameters of the polyvinyl acetal resin by controlling the hydroxyl group content to within 13% by mole of the total resin content. This parameter control allows the reused interlayer film to achieve both transparency enhancement and environmental sustainability by optimizing the resin's molecular structure to reduce scattering while maintaining recyclability
Solution Approach 2:
The invention creates a composite interlayer film system that combines fresh polyvinyl acetal resin with reused interlayer film materials. This composite approach allows the integration of recycled content (reducing environmental load) while maintaining optical properties through controlled composition and the specific hydroxyl group content requirement
2Illumination intensity
If different kinds of polyvinyl acetal resins are combinedly used, then the transparency can be enhanced, but the complexity of material selection and formulation increases
Solution Approach 1:
The invention simplifies material formulation by establishing a specific parameter range for hydroxyl group content (within 13% by mole of total resin). This parameter-based approach allows different polyvinyl acetal resins to be combined while ensuring transparency, reducing the complexity of material selection to a single controllable parameter rather than requiring complex multi-parameter optimization
Solution Approach 2:
The invention promotes homogeneous mixing of different polyvinyl acetal resins by controlling their hydroxyl group content to be similar (within 13% by mole difference). This homogeneity in chemical composition ensures compatible mixing behavior and uniform optical properties, simplifying the formulation process while achieving enhanced transparency
Data Source
AI summary
There is provided an interlayer film for laminated glass with which the transparency can be enhanced. The interlayer film for laminated glass according to the present invention is obtained by mixing a first film material containing a first polyvinyl acetal resin and a second film material containing a second polyvinyl acetal resin and a plasticizer, and the absolute value of the difference between the content of the hydroxyl group of the first polyvinyl acetal resin and the content of the hydroxyl group of the second polyvinyl acetal resin contained together with the plasticizer in the second film material is less than or equal to 13% by mole.