Laminated Glass Interlayer with Acetylated Resin for Sound Insulation
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Solution Overview
Problem
Existing laminated glasses with intermediate films containing polyvinyl acetal resin and plasticizer have insufficient sound-insulating properties, particularly at high frequencies, and are prone to bubble formation due to excessive plasticizer amounts, which compromises their performance.
Innovation Solution
A multilayer intermediate film structure with a first layer containing a polyvinyl acetal resin with a degree of acetylation exceeding 30 mol% and a second layer with a degree of acetylation of 5 mol% or lower, along with a third layer, is used, where the hydroxy group content and plasticizer distribution are controlled to enhance sound-insulating properties while preventing bubble formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the amount of plasticizer in the intermediate film is increased to improve sound-insulating property, then sound-insulating property is improved, but bubble formation occurs in the laminated glass
Solution Approach 1:
The patent changes the chemical composition parameters of the polyvinyl acetal resin, specifically controlling the degree of acetalization within 60-85 mol% and hydroxy group content within 5-30 mol%, to achieve optimal sound-insulating properties while preventing bubble formation. This parameter optimization allows sufficient plasticizer incorporation without causing bubbles.
Solution Approach 2:
The patent uses a composite material system combining polyvinyl acetal resin with specific plasticizers (triethylene glycol di-2-ethyl hexanoate, triethylene glycol dibutyrate, or diisodecyl adipate) in controlled ratios. This composite approach enables the intermediate film to achieve both high sound-insulating performance and bubble-free lamination by balancing material compatibility and acoustic properties.
2Device complexity
If a single-layer intermediate film with sound-insulating layer is used, then manufacturing is simplified, but bubble formation may occur and sound-insulating property at around 20°C is insufficient
Solution Approach 1:
The patent optimizes the thickness of the intermediate film to 0.05-0.50 mm and controls the plasticizer content at 30-70 parts by weight per 100 parts of resin, achieving improved sound-insulating properties at around 20°C while maintaining a simple single-layer structure that prevents bubble formation.
3Weight of moving object
If the intermediate film is made thinner to reduce weight, then weight is reduced, but sound-insulating property is reduced
Solution Approach 1:
The patent achieves weight reduction by optimizing the intermediate film thickness to 0.05-0.50 mm while compensating for sound-insulating performance through precise control of plasticizer content (30-70 parts per 100 parts resin) and resin composition, enabling thin-film designs with improved acoustic properties.
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 solution significantly improves the sound-insulating properties of laminated glasses across various frequency ranges and suppresses bubble formation, maintaining performance even under severe conditions.
Implementation Method 1
The proposed solution significantly improves the sound-insulating properties of laminated glasses across various frequency ranges
Implementation Method 2
suppresses bubble formation, maintaining performance even under severe conditions
Data Source
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Figure 3
AI summary
The present invention aims to provide an intermediate film for laminated glass which, in the case of being used for constituting a laminated glass, enables to improve the sound-insulating property of a laminated glass to be obtained; and a laminated glass. The intermediate film 1 for laminated glass of the present invention comprises a first layer 2 which contains a polyvinyl acetal resin and a plasticizer and the degree of acetylation of the polyvinyl acetal resin contained in the first layer 2 exceeds 30 mol%; and The laminated glass of the present invention comprises first and second components for laminated glass, and the intermediate film 1 for laminated glass sandwiched between the first and second components for laminated glass.