Bellows Heat Resistance via Ionizing Radiation Cross-Linking
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Solution Overview
Problem
Existing bellows used in advanced joint constructions for automotive applications, particularly those with high rotational rates, face material damage due to high operating temperatures, as they are not sufficiently heat-resistant, compromising their mechanical integrity and service life.
Innovation Solution
A method involving a mixture of thermoplastic elastomer and triallyl isocyanurate, exposed to ionizing radiation, which enhances the cross-linking of the material, allowing the bellows to withstand higher temperatures and extend service life, with specific ranges of triallyl isocyanurate content and radiation doses optimizing the performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If bellows are produced from thermoplastic elastomer with conventional cross-linking methods, then heat resistance is improved, but service life at high temperatures remains insufficient
Solution Approach 1:
The patent applies parameter changes by using a specific range of triallyl isocyanurate content (0.5-5 wt%) combined with controlled ionizing radiation doses (50-300 kGy) to achieve optimal cross-linking density. This quantitative parameter optimization transforms the material's thermal stability and mechanical properties, enabling the bellows to maintain elastomer characteristics while achieving superior heat resistance and extended service life at elevated temperatures.
Solution Approach 2:
The patent creates a composite material system by combining thermoplastic elastomer with triallyl isocyanurate cross-linking agent. This composite approach integrates the flexibility and elasticity of the elastomer base material with the enhanced thermal stability provided by the cross-linked network structure, resulting in a material that simultaneously maintains elastomeric properties while achieving high-temperature resistance.
2Temperature
If ionizing radiation dose is increased to enhance cross-linking, then heat resistance is improved, but mechanical integrity may be compromised
Solution Approach 1:
The patent resolves this contradiction through precise parameter control, establishing an optimal radiation dose range of 50-300 kGy combined with specific triallyl isocyanurate concentrations (0.5-5 wt%). Within this parameter window, the cross-linking process enhances heat resistance while preserving mechanical integrity. The controlled parameters ensure sufficient cross-linking density for thermal stability without creating excessive cross-linking that would embrittle the material.
Solution Approach 2:
The triallyl isocyanurate acts as an intermediary substance that mediates between the ionizing radiation and the thermoplastic elastomer matrix. It facilitates controlled cross-linking by reacting with polymer chains to form a three-dimensional network, thereby translating the energy from ionizing radiation into beneficial structural changes that enhance heat resistance while maintaining mechanical properties through its specific chemical reactivity and cross-linking mechanism.
3Duration of action of moving object
If triallyl isocyanurate content is increased to improve cross-linking, then runtime at high temperatures is extended, but material properties may deteriorate
Solution Approach 1:
The patent applies parameter changes by defining a specific triallyl isocyanurate concentration range (0.5-5 wt%) that optimizes the balance between cross-linking density and material property preservation. This quantitative control ensures sufficient cross-linking to extend runtime at high temperatures while preventing excessive cross-linking that would compromise elastomeric properties such as flexibility, elasticity, and overall material reliability.
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 enables bellows to operate for extended periods at high temperatures, with runtimes increased by up to 800% compared to traditional methods, maintaining mechanical integrity and elastomer properties, thus meeting the demands of modern automotive joint constructions.
Implementation Method 1
the at least one thermoplastic elastomer is mixed in a first step with approx. 0.8%, preferably with approx. 1.2% to approx. 5%, more preferably with approx. 1.4% to approx. 3.5%, more preferably to approx. 3%, and even more preferably with approx. 1.5%, and more preferably with approx. 1.85% to approx. 2.7% triallyl isocyanurate by weight with respect to the overall quantity of the mixture; the bellows is produced in a second step; and the bellows is exposed in a third step to ionizing radiation in a dose in the range of approx. 140 kGy to approx. 350 kGy
Implementation Method 2
the bellows is exposed in a third step to ionizing radiation in a dose in the range of approx. 140 kGy to approx. 350 kGy, preferably in a range of approx. 190 kGy to approx. 260 kGy
Data Source
AI summary
Bellows, for example, a roll bellows and a folding bellows, can be produced that can be used at higher temperatures such as those prevailing in modern articulated constructions, using a mixture comprising at least one thermoplastic elastomer selected from the group of copolysters with a hard segment and a soft segment, wherein in a first step the at least one thermoplastic elastomer is mixed with approximately 0.8 wt. % to approximately 5 wt. % triallyl isocyanurate, based on the total amount of the mixture; in a second step the bellows is produced; and in a third step, the bellows is exposed to an ionizing irradiation in a range from approximately 140 kGy to approximately 350 kGy.