Polyvinyl Acetal Resin Interlayers for Impact and Damping
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Solution Overview
Problem
Poly(vinyl acetal) resin compositions used in safety glass and polymeric laminates face challenges in balancing mechanical, optical, and acoustic properties, with high residual hydroxyl content leading to poor vibration dampening and sound attenuation, while low residual hydroxyl content results in limited impact resistance across a broad temperature range.
Innovation Solution
Development of poly(vinyl acetal) resin interlayers with at least 10 weight percent branched aliphatic aldehyde residues and a plasticizer content of at least 50 phr, and varying residual hydroxyl content between adjacent resin layers to achieve a tan delta of at least 1.05, optimizing properties for multiple applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high residual hydroxyl content and low plasticizer content are used in PVB resin, then glass transition temperature and impact resistance are improved, but vibration dampening and sound attenuation performance deteriorate
Solution Approach 1:
The invention changes the chemical composition parameters of the poly(vinyl acetal) resin by controlling the type and amount of aldehyde residues (at least 10 weight percent branched aliphatic aldehyde residues) and residual hydroxyl content (less than 12 weight percent), combined with specific plasticizer content (at least 50 phr), to achieve a balanced performance profile with tan delta of at least 1.05 that simultaneously provides impact resistance and vibration dampening
Solution Approach 2:
The invention creates a composite resin system by combining poly(vinyl acetal) resin with specific aldehyde residues and plasticizers in defined proportions, forming a multi-component material system where each component contributes specific properties that collectively resolve the contradiction between impact resistance and vibration dampening
2Loss of energy
If low residual hydroxyl content and high plasticizer content are used in PVB resin, then vibration dampening and sound attenuation are improved, but impact resistance over broad temperature range deteriorates
Solution Approach 1:
The invention optimizes the parameter balance by maintaining residual hydroxyl content below 12 weight percent while incorporating at least 50 phr plasticizer and at least 10 weight percent branched aliphatic aldehyde residues, achieving a tan delta of at least 1.05 that provides both vibration dampening and temperature-stable impact resistance
Solution Approach 2:
The invention introduces local chemical structure variations through branched aliphatic aldehyde residues with specific side chains (isopropyl, sec-butyl, or tert-butyl groups) that create localized structural features enhancing both energy dissipation and mechanical strength at different temperature conditions
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 optimized resin compositions exhibit enhanced mechanical, optical, and acoustic performance, providing improved impact resistance, sound dampening, and temperature stability, making them suitable for various applications including safety glass and polymeric laminates.
Implementation Method 1
the resin layer has a tan delta of at least 1.05
Implementation Method 2
these resins exhibit very poor vibration dampening and sound attenuation performance
Data Source
AI summary
Resin compositions, layers, and interlayers comprising a poly(vinyl acetal) resin that includes residues of an aldehyde other than n-butyraldehyde are provided. Such compositions, layers, and interlayers can exhibit enhanced or optimized properties as compared to those formulated with comparable poly(vinyl n-butyral) resins.