Laminated Glass Interlayer Film Acoustic Insulation
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Solution Overview
Problem
Laminated glasses with existing interlayer films have insufficient sound-insulating properties, particularly in high frequency ranges and against solid-borne sounds, and excessive plasticizer addition can lead to bleeding issues.
Innovation Solution
An interlayer film with a multilayer structure comprising a first layer of polyvinyl acetal resin, plasticizer, and rosin resin as a tackifier, and additional layers with lower acetylation degrees and reduced plasticizer amounts, enhancing sound-insulating properties and penetration resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If a thinner laminated glass is used to reduce weight, then weight is reduced, but sound-insulating property deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters of the interlayer film by specifying a polyvinyl acetal resin with a degree of acetalization of 70-85 mol% and adding a rosin resin tackifier in specific amounts (5-50 parts by weight per 100 parts of polyvinyl acetal resin). These parameter changes enable the interlayer film to achieve enhanced sound-insulating properties, particularly against solid-borne sounds, while maintaining a thin structure that reduces overall weight.
Solution Approach 2:
The patent creates a composite material system by combining polyvinyl acetal resin with rosin resin tackifier and plasticizer in specific proportions. This composite interlayer film formulation synergistically improves sound-insulating properties, particularly in the high frequency range (above 2000 Hz), while allowing the use of thinner glass plates to reduce weight.
2Object-affected harmful factors
If additional plasticizer is added to enhance sound-insulating property, then sound-insulating property is improved, but plasticizer bleeding occurs
Solution Approach 1:
The patent optimizes the plasticizer content parameter to 10-50 parts by weight per 100 parts of polyvinyl acetal resin, which is a controlled amount that provides sufficient sound-insulating enhancement without causing plasticizer bleeding. The patent also specifies the degree of acetalization (70-85 mol%) which affects plasticizer retention and prevents bleeding.
Solution Approach 2:
The rosin resin tackifier acts as an intermediary substance that stabilizes the plasticizer within the interlayer film matrix. The tackifier prevents plasticizer migration and bleeding while still allowing the plasticizer to provide its sound-insulating function. This intermediary role resolves the contradiction between using enough plasticizer for sound insulation and preventing plasticizer bleeding.
3Ease of manufacture
If existing interlayer film composition is used, then manufacturing is simple, but sound-insulating property against solid-borne sounds deteriorates
Solution Approach 1:
The patent modifies the interlayer film composition parameters by specifying polyvinyl acetal resin with 70-85 mol% degree of acetalization and adding rosin resin tackifier in specific amounts. These parameter changes enhance sound-insulating properties against solid-borne sounds while maintaining compatibility with existing lamination processes, thus preserving ease of manufacture.
Solution Approach 2:
The patent introduces a composite formulation combining polyvinyl acetal resin, rosin resin tackifier, and plasticizer. This composite material provides superior sound-insulating properties against solid-borne sounds compared to conventional interlayer films, while the formulation can be produced using standard polymer processing techniques, maintaining manufacturing simplicity.
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 significantly improves sound-insulating properties in high frequency ranges and reduces plasticizer bleeding, enhancing both sound insulation and mechanical properties of laminated glass.
Implementation Method 1
a tackifier, wherein the tackifier is a rosin resin
Data Source
Figure 1~2
AI summary
The present invention provides an interlayer for laminated glass which, when used to compose laminated glass, is capable of increasing sound insulation for the obtained laminated glass; and laminated glass. The interlayer for laminated glass according to the present invention includes a first layer, and a second layer which is laminated on a first surface of the first layer, and the first layer contains a polyvinyl acetal resin, a plasticizer and a tackifier; and the laminated glass according to the present invention includes first and second components for laminated glass and the interlayer disposed between the first and second components for laminated glass.