Pneumatic Tire Sealant Layer for Temperature-Resilient Puncture Sealing

Solution Overview

Problem

Conventional tire sealants lose puncture sealing capacity at high temperatures due to low viscosity and fail to flow at low temperatures, making them ineffective across a range of temperatures.

Innovation Solution

A tire with a built-in puncture sealant layer formed by thermal degradation of butyl ionomer containing precursor catalyzed by peroxide, which transforms into a low viscosity, easy-to-flow tacky material during tire curing, providing self-sealing properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a single layer of sealant of low viscosity is used, then puncture sealing performance at low temperature is improved, but puncture sealing performance at high temperature deteriorates due to excessive flow and depletion from the tire

Engineering Contradiction:

Improvepuncture sealing performanceVSAvoidpuncture sealing performance

Core Design Contradiction:

ReliabilityVSReliability

Solution Approach 1:

The sealant system is divided into multiple layers with different viscosity characteristics. The first sealant layer has lower viscosity for cold temperature effectiveness, while the second sealant layer has higher viscosity to prevent depletion at high temperatures. This segmentation allows each layer to perform optimally at different temperature conditions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The viscosity parameter of the sealant is changed across different layers. The first sealant layer uses a viscosity range of 50-500 Pascal seconds optimized for low temperature flow, while the second sealant layer uses 100-1000 Pascal seconds optimized for high temperature stability. This parameter variation resolves the contradiction between cold-temperature flowability and hot-temperature retention.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If a single layer of sealant of high viscosity is used, then puncture sealing performance at high temperature is improved, but puncture sealing performance at low temperature deteriorates due to inability to flow and plug punctures

Engineering Contradiction:

Improvepuncture sealing performanceVSAvoidpuncture sealing performance

Core Design Contradiction:

ReliabilityVSReliability

Solution Approach 1:

The sealant system is divided into multiple layers with different viscosity characteristics. The first sealant layer has lower viscosity for cold temperature effectiveness, while the second sealant layer has higher viscosity to prevent depletion at high temperatures. This segmentation allows each layer to perform optimally at different temperature conditions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The viscosity parameter of the sealant is changed across different layers. The first sealant layer uses a viscosity range of 50-500 Pascal seconds optimized for low temperature flow, while the second sealant layer uses 100-1000 Pascal seconds optimized for high temperature stability. This parameter variation resolves the contradiction between cold-temperature flowability and hot-temperature retention.

Inventive Principle:

Principle #35Parameter changes

3Ease of operation

If sealant viscosity is optimized for one temperature condition, then sealing effectiveness at that temperature is improved, but sealing effectiveness at opposite temperature deteriorates

Engineering Contradiction:

Improvesealant flowabilityVSAvoidsealant flowability

Core Design Contradiction:

Ease of operationVSEase of operation

Solution Approach 1:

Different regions of the sealant system (first layer vs. second layer) have different viscosity qualities tailored to specific temperature conditions. The inner first sealant layer has lower viscosity for cold temperature operation, while the outer second sealant layer has higher viscosity for hot temperature operation. This local quality differentiation allows the sealant system to adapt to varying thermal environments.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The viscosity parameter of the sealant is changed across different layers. The first sealant layer uses a viscosity range of 50-500 Pascal seconds optimized for low temperature flow, while the second sealant layer uses 100-1000 Pascal seconds optimized for high temperature stability. This parameter variation resolves the contradiction between cold-temperature flowability and hot-temperature retention.

Inventive Principle:

Principle #35Parameter changes

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 ensures consistent puncture sealing performance across varying temperatures by maintaining the sealant's viscosity and flow properties, enhancing the tire's ability to seal punctures effectively regardless of temperature.

Implementation Method 1

a sealant is formed during tire cure by thermal degradation of butyl ionomer containing precursor catalyzed by peroxide

Methodology Applied

Scientific EffectThermal degradation: Pyrolysis

Implementation Method 2

thermal degradation of butyl ionomer containing precursor catalyzed by peroxide

Methodology Applied

Scientific EffectCatalysis: Catalysis

Data Source

PatentUS10589478B2Pneumatic tire having sealant layer

Publication Date: 2020.03.17 TRIANGLE TIRE

AI summary

A tire with a built-in puncture sealant comprising a supporting tire carcass comprised of one or more layers of ply, an outer circumferential tread, and a radially inner layer, a pair of beads, sidewalls extending radially inward from the axial outer edges of the tread portion to join the respective beads, a sealant comprising a butyl ionomer containing degradation product, disposed inwardly from said tire carcass inner layer, wherein said sealant provides self-sealing properties to the tire.