Interlayer Film Transparency and Sound Insulation via Hydrogen Bonding
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Solution Overview
Problem
Conventional interlayer films for laminated glass do not effectively enhance sound insulating properties and adhesive force while maintaining transparency, and often face challenges in balancing these properties.
Innovation Solution
An interlayer film with a one-layer or multi-layer structure, containing a vinyl monomer polymer derived from polymerizable compositions with monomers having hydrogen bondability, specifically polyvinyl acetate or (meth)acrylic polymers, is used, which is processed through specific lamination and press-bonding steps to achieve enhanced sound insulation and adhesive force with minimal haze.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the transparency of the interlayer film is increased, then the visual clarity is improved, but the sound insulating property and interlayer adhesive force become difficult to enhance
Solution Approach 1:
The patent applies parameter changes by carefully controlling the saponification degree of the polyvinyl acetate resin within the range of 70-99.9% and the average polymerization degree between 100-1000. These parameter optimizations enable the interlayer film to achieve high transparency while simultaneously maintaining excellent sound insulating properties and interlayer adhesive force, resolving the technical contradiction between transparency and functional performance.
2Strength
If conventional interlayer film compositions are used to enhance adhesivity, then the adhesive property is improved to some extent, but the sound insulating property is not effectively enhanced
Solution Approach 1:
The patent utilizes parameter changes by optimizing the saponification degree (70-99.9%) and average polymerization degree (100-1000) of the polyvinyl acetate resin. This dual parameter control enables the material to simultaneously achieve enhanced adhesivity for bonding glass plates and improved sound insulating properties, overcoming the limitation of conventional formulations that could only improve one property at the expense of the other.
3Strength
If conventional interlayer film compositions are used to enhance adhesive force, then the adhesive property is improved to some extent, but the sound insulating property is not greatly enhanced
Solution Approach 1:
The patent applies parameter changes by precisely controlling the saponification degree within 70-99.9% and the average polymerization degree between 100-1000. This optimization strategy enables the interlayer film to achieve both enhanced adhesive force for strong glass plate bonding and significantly improved sound insulating properties, resolving the contradiction where conventional films could only moderately improve adhesivity without substantially enhancing sound insulation.
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 and adhesive force while maintaining high transparency, as measured by haze levels of 0.5% or less, effectively addressing the limitations of conventional films.
Implementation Method 1
the vinyl monomer polymer being a polymer of a polymerizable composition containing a monomer having a functional group having hydrogen bondability
Data Source
AI summary
Provided is an interlayer film for laminated glass capable of enhancing the sound insulating property and the interlayer adhesive force in an interlayer film having increased transparency. An interlayer film for laminated glass according to the present invention is an interlayer film for laminated glass having a one-layer or two or more-layer structure, the interlayer film includes a first layer containing a vinyl monomer polymer, the vinyl monomer polymer is a polymer of a polymerizable composition containing a monomer having a functional group having hydrogen bondability, and a laminated glass in which the interlayer film for laminated glass is arranged between two sheets of float glass having a thickness of 2.0 mm, a length of 30 mm and a width of 2.5 cm in conformity with JIS R3202 has a haze, measured in conformity with JIS K6714 by using a haze meter, of 0.5% or less.