Laminated Glass Interlayer Composition for Lightweight Rigidity
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Solution Overview
Problem
Existing laminated glasses used in automotive windows lack sufficient impact resistance, heat resistance, moisture resistance, and light resistance while maintaining rigidity and reducing weight per unit area.
Innovation Solution
A laminated glass design using a resin intermediate film containing a modified hydrogenated block copolymer with specific properties, such as a thickness ratio and storage elastic moduli, is employed to enhance impact resistance, heat resistance, and moisture resistance while reducing weight per unit area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If transparent plastic plate thickness is increased to maintain rigidity equivalent to glass, then rigidity is maintained, but weight reduction is insufficient
Solution Approach 1:
The patent uses a composite structure consisting of multiple glass plates bonded together with a resin intermediate film. This composite construction allows the laminated glass to achieve high rigidity equivalent to thick glass while maintaining lightweight properties, as the resin film provides structural support without the weight penalty of solid plastic plates.
2Weight of moving object
If glass plate thickness is decreased and resin intermediate film thickness is increased to reduce weight, then weight is reduced, but impact resistance and heat resistance deteriorate
Solution Approach 1:
The patent optimizes the thickness parameters of both the glass plates and the resin intermediate film to achieve the desired balance. By carefully selecting specific thickness ranges for each component, the laminated glass structure maintains impact resistance and heat resistance while achieving weight reduction compared to conventional single glass plates.
Solution Approach 2:
The composite structure of multiple glass plates with resin bonding provides superior impact resistance compared to single thin glass or solid plastic, as the layered construction with resin intermediates distributes impact forces across multiple interfaces, preventing catastrophic failure.
3Weight of moving object
If glass plate thickness is decreased and resin intermediate film thickness is increased to reduce weight, then weight is reduced, but heat resistance deteriorates
Solution Approach 1:
The patent selects specific thickness parameters for the glass plates and resin intermediate film that maintain heat resistance while reducing weight. The glass plates provide thermal stability and the optimized resin film thickness ensures sufficient thermal barrier properties without compromising the overall heat resistance of the laminated glass structure.
4Weight of moving object
If conventional resin intermediate films are used to reduce weight, then weight is reduced, but moisture resistance and light resistance deteriorate
Solution Approach 1:
The patent optimizes the thickness and composition parameters of the resin intermediate film to achieve moisture resistance while maintaining weight reduction benefits. The resin film is formulated and dimensioned to provide adequate moisture barrier properties without requiring excessive thickness that would compromise the lightweight objective.
Data Source
AI summary
The present invention is a laminated glass which is prepared by inserting a resin intermediate film between glass plates and adhering the glass plates to integrate them, having a bending deflection at 90°C is 7.3 N/mm2 or higher, a weight per unit area is 7.5 kg/m2 or less, wherein the resin intermediate film contains a modified hydrogenated block copolymer [E] obtained by introducing an alkoxysilyl group into a hydrogenated block copolymer [D], storage elastic moduli in the dynamic viscoelastic properties of the resin intermediate film are 5×108 Pa or lower at a temperature of -20°C and 2×107 Pa or higher at a temperature of 90°C, and the hydrogenated block copolymer [D] is obtained by hydrogenating 90% or more of carbon-carbon unsaturated bonds on a main chain and side chains and carbon-carbon unsaturated bonds on an aromatic ring in a specific block copolymer [C].