Pneumatic Tire Inner Layer Rubber Composition
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Solution Overview
Problem
Current rubber mixtures for pneumatic vehicle tire inner layers, particularly those containing butyl or halobutyl rubber, face challenges in sustainability, environmental friendliness, and production complexity, with issues related to airtightness and recyclability.
Innovation Solution
A rubber mixture comprising at least 50 phr of polyisoprene, a filler system with 50-95% pyrolysis soot and 5-45% inorganic fillers like calcium carbonate or talc, and the absence of butyl or halobutyl rubber, optimizing sustainability and environmental friendliness while maintaining airtightness and improving durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If butyl rubber or halobutyl rubber is used in the inner layer, then airtightness is improved, but sustainability and recyclability deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters by replacing butyl/halobutyl rubber with polyisoprene and adjusting the filler system to include pyrolysis soot and specific inorganic fillers, achieving both good airtightness and recyclability
Solution Approach 2:
The patent creates a composite rubber mixture combining polyisoprene with a specific filler system (pyrolysis soot + inorganic fillers like calcium carbonate or talc), achieving synergistic effects that provide both airtightness and environmental compatibility
2Reliability
If inorganic fillers like kaolin or calcium carbonate are added to improve airtightness, then airtightness is improved, but production complexity and bubble formation increase
Solution Approach 1:
The patent applies local quality by selecting specific types of inorganic fillers (calcium carbonate or platelet-shaped fillers) with particular properties that provide airtightness while minimizing processing difficulties and bubble formation
Solution Approach 2:
The patent optimizes the proportion of inorganic fillers to 5-45% of total fillers, a parameter range that balances airtightness performance with ease of manufacturing and reduced bubble formation
3Adaptability or versatility
If pyrolysis soot is used as filler, then sustainability is improved, but airtightness may deteriorate
Solution Approach 1:
The patent creates a composite filler system combining pyrolysis soot (50-95% of total fillers) with inorganic fillers (5-45% of total fillers), where the two filler types work synergistically to provide both sustainability and adequate airtightness
Solution Approach 2:
The patent optimizes the proportion of pyrolysis soot to constitute 50-95% of total fillers, a parameter range that maximizes sustainability benefits while maintaining sufficient airtightness through the complementary inorganic filler component
4Reliability
If high amounts of inorganic fillers are used, then airtightness is improved, but density increases and rolling resistance worsens
Solution Approach 1:
The patent limits inorganic fillers to 5-45% of total fillers, optimizing the parameter to balance airtightness with reduced density and rolling resistance
Solution Approach 2:
The patent selects specific inorganic fillers (calcium carbonate or platelet-shaped fillers) that provide airtightness with lower density impact compared to traditional heavy fillers
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 rubber mixture achieves enhanced durability, reduced production complexity, and improved recyclability with comparable airtightness, contributing to lower rolling resistance and ecological benefits through the use of recycled pyrolysis soot.
Implementation Method 1
a filler system with 50 to 95% by weight of at least one pyrolysis soot
Implementation Method 2
The airtightness of pneumatic vehicle tires is usually determined using a rubber mixture containing butyl rubber and/or halobutyl rubber
Data Source
AI summary
The invention relates to a rubber compound for the inner layer or tube of vehicle pneumatic tires and to a vehicle pneumatic tire. The rubber compound for the inner layer or tube of vehicle pneumatic tires comprises the following components: - at least 50 phr of at least one polyisoprene selected from natural and synthetic polyisoprene; and - a filler system comprising 50 to 95 wt.% of at least one pyrolysis carbon black and 5 to 45 wt.% of at least one inorganic filler as proportions of the total amount of fillers contained; and wherein the rubber compound is free of butyl rubber and free of halobutyl rubber. A vehicle pneumatic tire incorporating the rubber compound in the inner layer or tube exhibits very good durability and is optimized with regard to sustainability and environmental friendliness, as well as being easier and more cost-effective to manufacture while maintaining comparable airtightness.