Polyolefin elastomer compositions and methods of making the same
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Solution Overview
Problem
Current thermoplastic vulcanizates (TPV) and ethylene propylene diene monomer (EPDM) rubber formulations are costly, environmentally unfriendly, and have limited elastomeric performance and durability, requiring complex and energy-intensive manufacturing processes.
Innovation Solution
A silane-crosslinked polyolefin elastomer blend with a density less than 0.90 g/cm3, comprising a first polyolefin with low density and low crystallinity, a second polyolefin, and a silane crosslinker, which is extruded and molded to form elastomeric articles with improved properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If EPDM rubber formulations are used to achieve superior elastomeric performance and durability, then reliability is improved, but device complexity and manufacturing cost increase due to requiring many ingredients and complex multi-step processes
Solution Approach 1:
The patent extracts and eliminates numerous traditional EPDM ingredients (carbon black, petroleum-based oil, zinc oxide, miscellaneous fillers, curatives, blowing agents) by replacing them with a simplified polyolefin elastomer blend that achieves comparable or superior performance with fewer components, thereby reducing manufacturing complexity
Solution Approach 2:
The polyolefin elastomer blend serves multiple functions simultaneously: it provides the base polymer matrix, incorporates silane crosslinking agents for vulcanization, includes processing aids, and achieves both thermoplastic processability and thermoset elastomeric properties in a single material system, eliminating the need for separate ingredient components
2Reliability
If traditional EPDM extrusion processes are used to ensure proper vulcanization, then reliability is improved, but use of energy increases due to requiring long curing ovens and multiple processing stages
Solution Approach 1:
The patent changes the chemical parameters of the polymer system by using silane-grafted polyolefin elastomers that undergo condensation crosslinking at lower temperatures and shorter times compared to traditional EPDM vulcanization, thereby reducing energy consumption while maintaining vulcanization quality
Solution Approach 2:
The silane grafting is performed preliminarily during the polymer synthesis stage, so that the crosslinking agents are already incorporated into the polymer chains before processing, eliminating the need for separate high-energy vulcanization ovens and reducing overall energy requirements
3Reliability
If EPDM rubber compounds are used to achieve desired elastomeric properties, then reliability is improved, but loss of substance increases due to producing fumes that require venting and monitoring
Solution Approach 1:
The patent employs silane-based crosslinking systems that undergo condensation reactions producing water or alcohol as byproducts, replacing the sulfur-based vulcanization of EPDM that produces harmful fumes, thereby eliminating the need for complex venting and monitoring systems while maintaining elastomeric properties
Solution Approach 2:
The patent converts the potentially harmful fume-generating vulcanization process into a beneficial clean-crosslinking process by using silane condensation that produces harmless byproducts, transforming an environmental liability into an environmental advantage
4Ease of manufacture
If TPV formulations are used to simplify processing, then ease of manufacture is improved, but reliability deteriorates due to limited elastomeric performance and durability
Solution Approach 1:
The patent creates a composite material system combining polyolefin elastomers with silane crosslinking agents, where the polyolefin provides thermoplastic processability and the silane network provides thermoset elastomeric strength, achieving both ease of manufacture and superior reliability through material composition rather than process complexity
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 solution results in elastomeric articles with superior long-term load loss, reduced material costs, and enhanced environmental sustainability by simplifying the manufacturing process and reducing energy consumption.
Implementation Method 1
a silane crosslinker. The silane-crosslinked polyolefin elastomer blend exhibits a compression set of from about 5.0% to about 35.0%
Data Source
AI summary
An elastomeric article is provided that includes a composition having a silane-crosslinked polyolefin elastomer with a density less than 0.90 g/cm3. The elastomeric article can exhibit a compression set of from about 5.0% to about 35.0%, as measured according to ASTM D 395 (22 hrs @ 70° C.). The silane-crosslinked polyolefin elastomer can include a first polyolefin having a density less than 0.86 g/cm3, a second polyolefin having a crystallinity less than 40%, a silane crosslinker, a grafting initiator, and a condensation catalyst.