Polyester Composition with Epoxy-Functionalized Polyolefin for Thermal Aging Resistance
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Solution Overview
Problem
Polyester compositions face challenges in maintaining mechanical strength and processability while providing improved stability under heat and humidity conditions without adversely affecting their properties.
Innovation Solution
Incorporating an aromatic epoxy compound and an elastomeric component, such as epoxy-functionalized polyolefin copolymer or copolyester copolymer, into the polyester composition to enhance thermal aging resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If polyester compositions are used under heat and humidity conditions, then mechanical strength and processability are maintained, but stability under heat and humidity deteriorates
Solution Approach 1:
The patent creates a composite material system by combining polyester base resin with epoxy-functionalized polyolefin copolymer and copolyester copolymer. This composite structure allows the material to exhibit both the mechanical strength of polyester and the thermal/hydrolytic stability of the added components, resolving the contradiction between maintaining mechanical strength and improving stability under heat and humidity conditions.
Solution Approach 2:
The patent modifies the chemical composition parameters of the polyester system by incorporating specific ratios of epoxy-functionalized polyolefin (0.5-6 wt%) and copolyester copolymer (5-85 wt%). These parameter changes enhance the material's resistance to hydrolysis and thermal degradation while preserving mechanical properties, thereby improving reliability under harsh conditions without sacrificing strength.
2Reliability
If stability under heat and humidity is improved, then mechanical strength is maintained, but other advantageous properties of polyesters are adversely affected
Solution Approach 1:
The patent applies local quality by having different components perform specialized functions: the epoxy-functionalized polyolefin provides localized hydrolytic resistance at the molecular level, while the copolyester copolymer contributes to overall thermal stability. This localized functional distribution allows the material to achieve improved stability without compromising other advantageous properties such as processability and mechanical performance.
3Reliability
If elastomeric component is added to enhance thermal aging resistance, then thermal aging resistance is improved, but composition complexity increases
Solution Approach 1:
The patent merges multiple functions into a single elastomeric component system. The epoxy-functionalized polyolefin copolymer simultaneously provides thermal aging resistance, hydrolytic stability, and maintains compatibility with polyester processing. This consolidation of functions into carefully selected additive packages improves thermal aging resistance while minimizing the increase in composition complexity.
Data Source
AI summary
A composition contains a polyester; an aromatic epoxy compound, in an amount sufficient to provide 5 to 300 milliequivalents of epoxy per kilogram of polyester; and 0.5 to 6 weight percent, based on the weight of the polyester, and an ethylene-glycidyl methacrylate containing copolymer; and/or a copolyester copolymer, wherein the copolyester comprises, based on the weight of the copolyester, 15 to 95 weight percent of polyester units derived from the reaction of a C6-C24 aromatic dicarboxylic acid or a chemical equivalent thereof with a C2-C6 aliphatic diol, and 5 to 85 weight percent of polyester units derived from the reaction of a C6-C24 aromatic dicarboxylic acid or a chemical equivalent thereof with a poly(alkylene oxide) glycol having a molecular weight of 400-6,000 and a carbon to oxygen ratio of 2.0-4.3. The compositions have excellent hydrolytic resistance, and are suitable for making automotive and electronic parts.