Laminated Glass Interlayer Film Sound Insulation
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Solution Overview
Problem
Laminated glass with existing interlayer films has insufficient sound insulation properties, particularly in high frequency ranges and at low temperatures, due to the coincidence effect and excessive plasticizer bleeding, which affects its performance in vehicles with internal combustion engines and electric motors.
Innovation Solution
A multi-layer interlayer film structure comprising a first layer with polyvinyl acetate resin and a plasticizer having a cloud point of 80° C. or less, and additional layers with polyvinyl acetal resin, enhancing sound insulation by improving compatibility and adhesion, and incorporating a tackifier like rosin resin for improved sound insulation and penetration resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the thickness of the laminated glass is reduced to reduce weight, then the weight is reduced, but the sound insulation property is deteriorated
Solution Approach 1:
The interlayer film uses a composite material system consisting of polyvinyl acetate resin as the base polymer, plasticizer for flexibility, and metal salts (such as calcium carbonate or barium sulfate) as sound insulation additives. This composite structure enables the thin film to achieve high sound insulation performance without increasing thickness or weight, resolving the contradiction between weight reduction and sound insulation maintenance.
Solution Approach 2:
The invention changes the chemical composition parameters of the interlayer film by incorporating specific metal salts and optimizing the plasticizer content. These parameter changes enhance the sound insulation capability of the thin film, allowing it to block sound waves effectively even at reduced thickness, thus maintaining sound insulation performance while reducing overall glass assembly weight.
2Object-affected harmful factors
If the sound insulation property is improved by modifying interlayer film materials, then the sound insulation property is improved, but the high frequency sound insulation is still insufficient
Solution Approach 1:
The interlayer film is designed with locally optimized properties where metal salt particles are distributed throughout the polyvinyl acetate resin matrix to specifically target high frequency sound wave absorption. The plasticizer is also strategically formulated to enhance the film's ability to dampen high frequency vibrations, creating local quality enhancements that address the specific weakness in high frequency sound insulation.
3Ease of operation
If plasticizer is added to improve flexibility and sound insulation, then flexibility is improved, but plasticizer bleeding occurs excessively
Solution Approach 1:
The invention optimizes the plasticizer content parameter within a specific range (30-70 parts by weight per 100 parts of polyvinyl acetate resin) and selects plasticizers with specific molecular structures that have lower volatility and better compatibility with the resin matrix. This parameter optimization maintains the necessary flexibility while significantly reducing plasticizer bleeding, resolving the contradiction between flexibility and substance loss.
Data Source
AI summary
An interlayer film for laminated glass that can improve a sound insulation property of an obtained laminated glass when the interlayer film for laminated glass is used for configuring the laminated glass is provided. The interlayer film for laminated glass according to the present invention includes a first layer and a second layer laminated on a first surface of the first layer. The first layer includes a polyvinyl acetate resin and a plasticizer.