Modified Natural Rubber Tire Composition for Balanced Performance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current rubber compositions for tires face challenges in achieving a balance of fuel economy, processability, heat aging resistance, abrasion resistance, wet-grip performance, performance on snow and ice, and handling stability, with existing methods failing to sufficiently improve these properties simultaneously.
Innovation Solution
A rubber composition incorporating modified natural rubber with a phosphorus content of 200 ppm or less and a silica with a CTAB specific surface area of 180 m²/g or more, along with a BET specific surface area of 185 m²/g or more, and a pH adjusted to 2-7, which is prepared without mastication and includes a silane coupling agent, to enhance the balance of properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If natural rubber is mixed with a peptizer and masticated to reduce Mooney viscosity, then processability is improved, but molecular chains are broken resulting in loss of high-molecular-weight polymer characteristics such as fuel economy, abrasion resistance, and rubber strength
Solution Approach 1:
The patent changes the chemical parameter of natural rubber by controlling pH to 2-7 and reducing phosphorus content to 200 ppm or less through modification processes. This parameter change improves processability without requiring mastication that would break molecular chains, thereby preserving fuel economy and abrasion resistance properties.
Solution Approach 2:
The patent creates a composite system by combining modified natural rubber with specific silica (having CTAB specific surface area of 180 m²/g or more). This composite approach enhances both processability and performance properties simultaneously, resolving the contradiction between ease of manufacture and reliability.
2Use of energy by moving object
If natural rubber latex is combined with surfactant and washed to reduce protein and gel contents, then fuel economy is improved to some extent, but heat aging resistance is insufficient
Solution Approach 1:
The patent applies parameter changes by controlling pH to 2-7 and phosphorus content to 200 ppm or less through systematic modification. This dual parameter control achieves both improved fuel economy and sufficient heat aging resistance, overcoming the limitation of conventional surfactant washing methods.
Solution Approach 2:
The patent performs preliminary modification of natural rubber before tire manufacturing by removing non-rubber components and adjusting pH/phosphorus levels. This preliminary action ensures both fuel economy and heat aging resistance are optimized in advance, avoiding the need for additional processing later.
3Use of energy by moving object
If natural rubber is used to improve fuel economy, then fuel economy is enhanced, but Mooney viscosity is higher than synthetic rubbers resulting in poor processability
Solution Approach 1:
The patent changes the chemical parameters of natural rubber by reducing phosphorus content to 200 ppm or less and adjusting pH to 2-7. These parameter changes reduce Mooney viscosity and improve processability while preserving the fuel economy advantages of natural rubber.
Solution Approach 2:
The patent extracts and removes non-rubber components (particularly phosphorus-containing substances) from natural rubber through washing and modification processes. This extraction reduces Mooney viscosity and improves processability while maintaining the beneficial fuel economy properties of the natural rubber polymer.
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 composition achieves a significant improvement in fuel economy, processability, heat aging resistance, abrasion resistance, wet-grip performance, performance on snow and ice, and handling stability, providing a balanced set of properties for tire applications.
Implementation Method 1
the rubber composition preferably contains a silane coupling agent
Implementation Method 2
a silica having a CTAB specific surface area of 180 m²/g or more
Data Source
AI summary
Provided are a rubber composition for tires that shows a balanced improvement in properties such as fuel economy, processability, heat aging resistance, abrasion resistance, wet-grip performance, performance on snow and ice, and handling stability, and a pneumatic tire formed from the rubber composition. The present invention relates to a rubber composition for tires, containing: a highly purified, modified natural rubber having a pH adjusted to 2 to 7, and a silica having a CTAB specific surface area of 180 m2/g or more and a BET specific surface area of 185 m2/g or more, and also relates to a pneumatic tire formed from the rubber composition.