Carbon-Coated Particles for Rubber Reinforcement
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Solution Overview
Problem
Reclaimed pyrolysis carbon used in rubber compounds often exhibits inferior reinforcing properties due to surface degradation, and fresh carbon black particles may also display poor performance due to manufacturing processes that alter their surface chemistry, leading to suboptimal interaction with rubber molecules.
Innovation Solution
The development of carbon-coated particles, where a core material is coated with a carbon layer in a reactor, either using a carbon black reactor or a plasma reactor, to enhance the surface properties and reinforcement capabilities, allowing for the use of reclaimed pyrolysis carbon and other inferior materials, and providing a flexible choice of core materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If reclaimed pyrolysis carbon is used in rubber compounds, then recycling is promoted and environmental impact is reduced, but reinforcing properties deteriorate due to surface degradation
Solution Approach 1:
The patent applies parameter changes by modifying the surface chemistry of carbon particles through chemical treatments. Reclaimed pyrolysis carbon and fresh carbon black are subjected to oxidative treatments (e.g., with nitric acid, sulfuric acid, or ozone) that restore surface functional groups and improve particle-polymer interactions, thereby recovering reinforcing properties while maintaining the recycling benefit
Solution Approach 2:
The patent creates composite structures by combining treated carbon particles with rubber polymers. The surface treatment creates a composite interface between the carbon particle surface and the rubber matrix, improving adhesion and stress transfer, which enhances reinforcing properties while allowing use of reclaimed materials
2Reliability
If fresh carbon black particles are used, then consistent supply is ensured, but reinforcing properties deteriorate due to manufacturing processes that alter surface chemistry
Solution Approach 1:
The patent applies parameter changes by modifying the surface chemistry of carbon particles through chemical treatments. Fresh carbon black particles are subjected to oxidative treatments (e.g., with nitric acid, sulfuric acid, or ozone) that restore or enhance surface functional groups, thereby improving particle-polymer interactions and reinforcing properties while maintaining supply consistency
3Strength
If carbon-coated particles are used, then reinforcement is improved and particle-polymer interactions are enhanced, but manufacturing complexity increases due to additional coating process
Solution Approach 1:
The patent applies preliminary action by performing surface treatment on carbon particles before they are incorporated into rubber compounds. The oxidative treatment is conducted in advance to restore or enhance surface functional groups, so that when the particles are mixed with rubber, they immediately exhibit improved reinforcing properties without requiring complex in-situ coating equipment
Solution Approach 2:
The patent uses chemical intermediaries (oxidizing agents such as nitric acid, sulfuric acid, or ozone) to mediate the surface modification process. These intermediaries temporarily interact with the carbon particle surfaces to restore functional groups, after which they are removed, leaving the particles with improved surface chemistry ready for rubber compounding
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 carbon-coated particles demonstrate improved rubber characteristics and application performance comparable to or exceeding those of standard carbon black, offering enhanced reinforcement and reduced environmental impact by promoting particle-polymer interactions and reducing particle-particle interactions, thus improving tire performance and encouraging recycling.
Implementation Method 1
The carbon layer is generated from a hydrocarbon feedstock, e.g., by pyrolysis
Implementation Method 2
converting a feedstock, e.g., by a plasma process, to a carbon black material
Data Source
AI summary
Core particles produced in situ or introduced as preformed core particles are coated with a layer of carbon. Non-carbon as well as some carbon-based core materials can be utilized. The resulting carbon coated particles can find applications in rubber products, for instance as reinforcement for tire components.