Self-Sealing Tire Sealant Composition for High-Temperature Stability
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Solution Overview
Problem
Self-sealing tire sealants face challenges in maintaining optimal flow behavior and spatial stability, especially at high temperatures above 30°C, while ensuring sufficient elasticity and stickiness for effective puncture sealing without difficulties during production.
Innovation Solution
The sealant composition includes 3.6 to 10% by weight of a tackifier, 50 to 64.5% by weight of polyolefin, at least one rubber, a filler, and a crosslinker with a crosslinking initiator, specifically using natural or butyl rubber and polybutene, which optimizes flow behavior and stability, enhancing the sealing effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the sealant uses high viscosity to improve static stability, then sealing effectiveness is improved, but flow behavior deteriorates at high temperatures
Solution Approach 1:
The patent applies parameter changes by carefully controlling the viscosity within the range of 50-200 Pa·s at 23°C and the molecular weight Mn of polyolefin between 400-2500 g/mol. This optimization ensures the sealant maintains appropriate flow behavior at application temperature while achieving sufficient static stability for effective puncture sealing.
Solution Approach 2:
The patent uses composite materials by combining polyolefin (50-64.5 wt.%) with rubber (10-30 wt.%), filler (5-20 wt.%), and other additives. This composite formulation synergistically improves both flow behavior and static stability, resolving the contradiction between these two properties.
2Strength
If the sealant increases elasticity to improve puncture sealing, then sealing effectiveness is improved, but manufacturing processability deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the elasticity through specific compositional parameters: polyolefin molecular weight Mn of 400-2500 g/mol and viscosity of 50-200 Pa·s at 23°C. These parameter optimizations ensure sufficient elasticity for puncture sealing while maintaining good manufacturing processability.
Solution Approach 2:
The patent applies local quality by differentiating the properties of different components: polyolefin provides elasticity and adhesion, while rubber contributes to overall elasticity. The filler and other additives are locally optimized to enhance specific properties without compromising overall processability.
3Strength
If the sealant increases stickiness to improve puncture sealing, then sealing effectiveness is improved, but flow behavior deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the tackiness through controlled addition of tackifiers (0.1-5 wt.%) and controlling polyolefin viscosity at 50-200 Pa·s. This ensures sufficient tackiness for sealing while preventing excessive stickiness that would harm flow behavior during application.
Solution Approach 2:
The patent optimizes the balance between tackiness and flow behavior by controlling the viscosity parameter of polyolefin within 50-200 Pa·s at 23°C and limiting tackifier content to 0.1-5 wt.%. This parameter optimization ensures the sealant has enough stickiness to adhere to puncture surfaces while maintaining adequate flowability for proper distribution.
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 sealant achieves improved flow behavior, spatial stability, and sealing effectiveness at high temperatures, ensuring efficient puncture sealing without production difficulties, resulting in a safer and more reliable tire performance.
Implementation Method 1
At least one crosslinking agent and at least one crosslinking initiator
Data Source
AI summary
The invention relates to an automatically sealing tire sealant and to a vehicle pneumatic tire containing the tire sealant. The sealant according to the invention contains 3.6 to 10 wt% of at least one tackifier and 50 to 64.5 wt% of at least one polyolefin. The pneumatic vehicle tire according to the invention has the tire sealant according to the invention at least on the interior surface opposite the tread.