Tire Sealant Composition Balancing Flow and Shape Retention
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Solution Overview
Problem
Existing sealant compositions for pneumatic tires are either too viscous, making application slow, or they lack shape retention and sealing properties, leading to deformation and air leakage over time.
Innovation Solution
A sealant composition comprising 60-100 parts by mass of natural rubber, 95-150 parts by mass of a hydrocarbon resin with a terpene-based resin, and 20-100 parts by mass of a liquid plasticizer, primarily aroma oil, which enhances shape retention and sealing properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the sealant composition contains high hydrocarbon resin content to improve application speed, then application speed is improved, but shape retention deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the hydrocarbon resin content within 95-150 parts per 100 parts of solid rubber component, and liquid plasticizer within 20-100 parts per 100 parts of solid rubber component. This optimized ratio achieves the right balance between application speed and shape retention, resolving the contradiction between these two parameters.
Solution Approach 2:
The patent uses composite materials by combining natural rubber (60-100 parts) with hydrocarbon resin (95-150 parts) and liquid plasticizer (20-100 parts) in specific proportions. This composite formulation integrates the shape retention properties of natural rubber with the flow properties of hydrocarbon resin and liquid plasticizer, simultaneously achieving both fast application and good shape retention.
2Reliability
If the sealant composition is made softer to improve sealing properties, then sealing properties are improved, but shape retention deteriorates
Solution Approach 1:
The patent applies parameter changes by controlling the liquid plasticizer content within 20-100 parts per 100 parts of solid rubber component, and hydrocarbon resin within 95-150 parts per 100 parts of solid rubber component. These parameter adjustments optimize the softness for sealing while preventing excessive deformation, resolving the contradiction between sealing properties and shape retention.
Solution Approach 2:
The patent uses composite materials combining natural rubber with hydrocarbon resin and liquid plasticizer in optimized ratios. The natural rubber provides structural integrity and shape retention, while the hydrocarbon resin and liquid plasticizer provide softness and sealing capability, achieving both sealing properties and shape retention simultaneously.
3Productivity
If the sealant composition contains more liquid plasticizer to reduce viscosity, then application speed is improved, but shape retention deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the liquid plasticizer content within 20-100 parts per 100 parts of solid rubber component. This optimized parameter range reduces viscosity for fast application while preventing excessive softening that would compromise shape retention, resolving the contradiction between application speed and shape retention.
Solution Approach 2:
The patent uses composite materials where liquid plasticizer (20-100 parts) is combined with solid rubber component (60-100 parts) and hydrocarbon resin (95-150 parts). This composite structure provides the right balance of fluidity from liquid plasticizer and structural integrity from solid rubber, achieving both fast application and good shape retention.
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 composition forms a sealant layer that maintains shape and effectively prevents air leakage over time, even after puncture, by combining natural rubber's crosslinked structure with terpene-based resin compatibility and aroma oil's fluidity.
Implementation Method 1
natural rubber's crosslinked structure
Implementation Method 2
terpene-based resin compatibility
Implementation Method 3
liquid plasticizer, primarily aroma oil, which enhances shape retention and sealing properties
Data Source
Figure 1
AI summary
The sealant composition according to an embodiment includes, per 100 parts by mass of a solid rubber component containing 60 parts by mass or more of natural rubber: 95 to 150 parts by mass of a hydrocarbon resin containing 30 parts by mass or more of a terpene-based resin; and 20 to 100 parts by mass of a liquid plasticizer.