Multilayer Interlayer Film for Laminated Glass Sound Insulation
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Solution Overview
Problem
Current laminated glass interlayer films fail to provide adequate sound insulation, particularly for solid-borne sounds, and excessive plasticizer addition can lead to bleeding and bubble formation, compromising the glass's performance.
Innovation Solution
A multilayer interlayer film structure with a first layer containing polyvinyl acetal resin and a diester plasticizer, and a second layer with a higher hydroxyl content polyvinyl acetal resin, which suppresses plasticizer bleeding and enhances sound insulation and penetration resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an excessive amount of plasticizer is added to increase sound insulation, then sound insulation is improved, but plasticizer bleeding and bubble formation occur
Solution Approach 1:
The patent changes the chemical structure parameters of the plasticizer by specifying ether bond-containing groups (R1 and R2 in formula 1) and controlling the number of ether bonds (n=2-8). This structural modification allows the plasticizer to provide adequate sound insulation while reducing excessive migration and bleeding, thus preventing bubble formation.
Solution Approach 2:
The patent uses a composite interlayer film structure combining polyvinyl acetal resin with a specifically structured plasticizer containing ether bonds. This composite material system achieves enhanced sound insulation performance while the ether bond structure of the plasticizer component prevents excessive migration and bubble formation.
2Weight of moving object
If reduction in thickness of laminated glass is implemented for weight reduction, then weight is reduced, but sound insulation deteriorates
Solution Approach 1:
The patent changes the material parameters of the interlayer film by incorporating a plasticizer with specific ether bond structures (formula 1 where n=2-8). This parameter change enhances the sound insulation performance per unit thickness, allowing thinner glass configurations to achieve adequate sound insulation without compromising weight reduction goals.
3Reliability
If sound insulation is enhanced for solid born sound, then sound insulation is improved, but penetration resistance may be compromised
Solution Approach 1:
The patent modifies the plasticizer structure by incorporating ether bonds (R1 and R2 groups with oxygen atoms) and controlling the chain length (n=2-8). This structural change enhances the material's ability to dampen solid-borne vibrations while the balanced molecular structure maintains adequate penetration resistance.
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 film structure significantly improves sound insulation and penetration resistance while preventing bubble formation, maintaining the glass's integrity and functionality.
Implementation Method 1
a polyvinyl acetal resin and a first plasticizer represented by formula (1)... the first layer further contains a second plasticizer that is a diester compound... the second layer contains a plasticizer and a polyvinyl acetal resin
Implementation Method 2
an interlayer film for laminated glass which can provide a laminated glass excellent in sound insulation
Data Source
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AI summary
The present invention provides an interlayer film for laminated glass which can give a laminated glass with better sound insulation when used in the laminated glass. The present invention provides an interlayer film for laminated glass having a monolayer structure comprising only a first layer or a multilayer structure comprising at least two layers including a first layer and a second layer stacked at least on one face of the first layer, wherein the first layer contains a thermoplastic resin and a first plasticizer represented by the formula (1): and the interlayer film has a monolayer structure or a multilayer structure including at least two layers and includes the first layer further containing a second plasticizer that is a diester compound, or the interlayer film has a multilayer structure including at least two layers and includes the second layer containing a plasticizer and a polyvinyl acetal resin with a hydroxyl content of 25 to 40 mol%.