Tire Sealant Composition for Through-Hole Sealing and Storage Stability
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Solution Overview
Problem
Existing sealant compositions for pneumatic tires face challenges in sealability against through-holes, viscosity temperature dependency, and fluidity during storage and travel, particularly when foreign objects penetrate the tread portion.
Innovation Solution
A sealant composition is developed by blending specific amounts of a tackifier with a softening point of 50° C. or higher and a plasticizer with dynamic viscosity at 40° C. of 2500 mm2/s or less, maintaining a mass ratio of plasticizer to tackifier of 0.35 or more, which enhances sealability and reduces viscosity temperature dependency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealant composition is designed to flow easily into through-holes to improve sealability, then the sealability is improved, but the sealant may flow excessively during storage or travel due to heat or centrifugal forces
Solution Approach 1:
The patent applies parameter changes by carefully controlling the softening point of the tackifier (50°C or higher) and the dynamic viscosity of the plasticizer at 40°C (2500 mm²/s or less), along with specifying a mass ratio of plasticizer to tackifier (0.35 or more). These parameter specifications optimize the sealant's viscosity-temperature dependency, enabling it to flow into through-holes at operating temperatures while maintaining stability during storage at lower temperatures.
2Stability of the object's composition
If the sealant composition has low viscosity temperature dependency to maintain stable viscosity, then the stability is improved, but the fluidity during travel under centrifugal force may be insufficient
Solution Approach 1:
The patent resolves this contradiction by optimizing the viscosity-temperature characteristics through specific parameter selections: tackifier with softening point ≥50°C and plasticizer with dynamic viscosity ≤2500 mm²/s at 40°C, and a mass ratio (C)/(B) ≥0.35. This combination creates a sealant that maintains appropriate viscosity across temperature ranges while retaining sufficient fluidity under centrifugal force during travel.
3Speed
If the sealant composition uses higher amounts of plasticizer to improve fluidity, then the fluidity is improved, but the sealant may flow during storage of the tire
Solution Approach 1:
The patent applies parameter changes by specifying that the plasticizer must have a dynamic viscosity of 2500 mm²/s or less at 40°C and that the mass ratio of plasticizer to tackifier must be 0.35 or more. These controlled parameters ensure the sealant has sufficient fluidity for sealing while the tackifier's higher softening point (≥50°C) prevents excessive flow during storage at lower temperatures.
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 composition effectively flows into through-holes, maintaining air pressure and preventing flow due to heat or centrifugal forces during travel, while inhibiting flow during tire storage, thus improving sealability and storability.
Implementation Method 1
the plasticizer (C) having a dynamic viscosity at 40° C. of 2500 mm2/s or less
Implementation Method 2
the tackifier (B) having a softening point of 50° C. or higher
Implementation Method 3
a mass ratio of (C)/(B) of the plasticizer (C) to the tackifier (B) being 0.35 or more
Data Source
AI summary
A sealant composition of the present invention includes a rubber component (A), a tackifier (B), and a plasticizer (C), in which the tackifier (B) has a softening point of 50° C. or higher, the plasticizer (C) has a dynamic viscosity at 40° C. of 2500 mm2/s or less, and a mass ratio of (C)/(B) of the plasticizer (C) to the tackifier (B) is 0.35 or more. Thus, the sealant composition can provide improved sealability, viscosity temperature dependency, and fluidity during storage of a tire.