Segmented Interlayer Film for Laminated Glass Acoustic Performance
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Solution Overview
Problem
Laminated glasses with existing interlayer films fail to provide adequate sound insulation and vibration damping performance across a wide temperature range, particularly at low and high temperatures, due to the limitations of plasticizer distribution and viscoelastic state transitions in the interlayer layers.
Innovation Solution
An interlayer film comprising horizontally arranged parts with different resin compositions, each having a distinct maximum loss tangent temperature, ensuring that at least one part remains in an intermediate state between the glass and rubbery states across a wide temperature range, enhancing sound insulation and vibration damping performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-layer interlayer film with uniform plasticizer distribution is used, then the manufacturing process is simple, but the sound insulation and vibration damping performance are insufficient across wide temperature ranges
Solution Approach 1:
The interlayer film is divided into multiple layers with different plasticizer contents. The first interlayer has lower plasticizer content (15-40 parts by weight per 100 parts polyvinyl acetal resin) while the second interlayer has higher plasticizer content (30-70 parts by weight per 100 parts polyvinyl acetal resin). This segmentation allows each layer to contribute to different aspects of sound insulation and vibration damping performance across various temperature ranges, resolving the contradiction between manufacturing simplicity and performance reliability.
Solution Approach 2:
The invention uses a composite structure combining polyvinyl acetal resin with different plasticizer contents in specific layers. The composite interlayer film integrates materials with different viscoelastic properties, enabling the laminated glass to maintain excellent sound insulation and vibration damping performance across wide temperature ranges from -30°C to 70°C, while still using a relatively simple lamination process.
2Reliability
If the plasticizer content is increased to improve sound insulation, then sound insulation performance improves, but plasticizer bleeding out occurs
Solution Approach 1:
The interlayer film is segmented into two functional layers: the first interlayer with lower plasticizer content (15-40 parts by weight per 100 parts resin) that provides structural stability and prevents plasticizer bleeding, and the second interlayer with higher plasticizer content (30-70 parts by weight per 100 parts resin) that provides excellent sound insulation and vibration damping performance. This segmentation resolves the contradiction by containing the high plasticizer content in a dedicated layer protected by the low plasticizer content layer.
3Weight of moving object
If entirely thin laminated glass is used to achieve light weight, then weight and cost are reduced, but heat and sound insulation performance deteriorates
Solution Approach 1:
The invention uses a composite interlayer film structure with two layers having different plasticizer contents to achieve superior sound insulation and vibration damping performance in thin laminated glass. The first interlayer (lower plasticizer content) and second interlayer (higher plasticizer content) work synergistically to provide excellent acoustic performance across wide temperature ranges, enabling thin glass designs (e.g., 2+2 mm configuration) to maintain high sound insulation without increasing weight or thickness.
Solution Approach 2:
The invention optimizes the plasticizer content parameter in different interlayer portions to achieve maximum sound insulation performance. By setting specific plasticizer content ranges (15-40 parts by weight in the first interlayer, 30-70 parts by weight in the second interlayer), the laminated glass achieves excellent vibration damping and sound insulation performance while maintaining a thin overall structure, thus resolving the contradiction between thin design and acoustic performance.
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 interlayer film achieves high sound insulation and vibration damping performance across a wide temperature range by distributing energy effectively and maintaining optimal viscoelastic states, outperforming monolayer films and traditional laminated glass structures.
Implementation Method 1
the interlayer film for a laminated glass has a difference between temperatures Ta and Tb of 10° C. or larger when the temperature Ta is a temperature at which the resin composition A or the resin A shows a maximum loss tangent of a dynamic viscoelasticity at a frequency of 1 Hz, and the temperature Tb is a temperature at which the resin composition B or the resin B shows a maximum loss tangent of a dynamic viscoelasticity at a frequency of 1 Hz
Data Source
AI summary
An interlayer film for a laminated glass that provides excellent vibration damping performance at high temperature and excellent sound insulation in a wide temperature range. The interlayer film contains a part A containing a resin composition A or a resin A and a part B containing a resin composition B or a resin B, and the part A and the part B are horizontally arranged. The interlayer film has a difference between temperatures Ta and Tb of 10° C. or larger when the temperature Ta is a temperature at which the resin composition A or the resin A shows a maximum loss tangent of a dynamic viscoelasticity at a frequency of 1 Hz, and the temperature Tb is a temperature at which the resin composition B or the resin B shows a maximum loss tangent of a dynamic viscoelasticity at a frequency of 1 Hz.