Polyvinyl Acetal Resin Composition for Wide Temperature Strength
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Solution Overview
Problem
Polyvinyl acetal resins exhibit temperature-dependent mechanical strength, being strong at low temperatures but fragile and soft at high temperatures, limiting their mechanical strength over a wide temperature range.
Innovation Solution
A polyvinyl acetal resin composition with a crosslinked structure dispersed as a dispersed phase in a continuous phase, adjusted to have specific dynamic viscoelastic properties, including a maximum loss tangent at 40°C or higher and 10°C or lower, enhancing mechanical strength across a broad temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If polyvinyl acetal resin is used as a thermoplastic resin, then it has great breaking strength at low temperatures, but it becomes fragile with small elongation rate at low temperatures and too soft with poor breaking strength at high temperatures
Solution Approach 1:
The patent creates a composite material system consisting of polyvinyl acetal resin as the continuous phase and crosslinked structure-containing resin as the dispersed phase. This composite structure allows the continuous phase to provide toughness and elongation at low temperatures, while the crosslinked dispersed phase maintains structural integrity and breaking strength at high temperatures, thereby resolving the temperature-dependent mechanical strength limitation.
Solution Approach 2:
The patent applies local quality by creating regions with different structural characteristics within the material. The crosslinked structure-containing resin forms discrete dispersed phases distributed throughout the polyvinyl acetal continuous phase. These localized crosslinked regions provide high-temperature strength where needed, while the surrounding polyvinyl acetal matrix maintains low-temperature flexibility and elongation, allowing different parts of the material to exhibit optimal properties for their respective temperature conditions.
2Ease of operation
If the polyvinyl acetal resin is made softer to improve elongation rate at high temperatures, then the breaking strength at high temperatures improves, but the breaking strength at low temperatures deteriorates
Solution Approach 1:
The composite structure enables the material to exhibit appropriate mechanical properties for each temperature condition. At high temperatures, the crosslinked dispersed phases act as reinforcing elements that prevent excessive softening while allowing sufficient elongation. At low temperatures, the polyvinyl acetal continuous phase maintains its inherent toughness and breaking strength, preventing the material from becoming too brittle.
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 composition achieves excellent mechanical strength from low to high temperatures by inducing shape deformation at low temperatures and maintaining toughness at high temperatures due to hydrogen bonding and crosslinked structure aggregation.
Implementation Method 1
a maximum value of a loss tangent derived from the polyvinyl acetal resin at 40° C. or higher and a maximum value of a loss tangent derived from the resin having a crosslinked structure at 10° C. or lower in measurement of a dynamic viscoelasticity spectrum
Implementation Method 2
maintaining toughness at high temperatures due to hydrogen bonding and crosslinked structure aggregation
Data Source
AI summary
The present invention provides a polyvinyl acetal resin composition exerting excellent mechanical strength over a wide temperature range from low temperatures to high temperatures. The present invention provides a polyvinyl acetal resin composition containing a polyvinyl acetal resin and a resin having a crosslinked structure, the polyvinyl acetal resin composition having a structure in which the resin having a crosslinked structure is dispersed as a dispersed phase in the polyvinyl acetal resin as a continuous phase, the polyvinyl acetal resin composition having a maximum value of a loss tangent derived from the polyvinyl acetal resin at 40° C. or higher and a maximum value of a loss tangent derived from the resin having a crosslinked structure at 10° C. or lower in measurement of a dynamic viscoelasticity spectrum at a frequency of 10 Hz.