Core-Shell Polymer Particles for Tire Rubber Performance
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Solution Overview
Problem
Current rubber compositions for tires face challenges in achieving a balance between slip resistance, rolling resistance, and abrasion resistance while maintaining mechanical properties like tensile strength and tensile elongation, with silica fillers requiring special processing and high coupling agent usage due to their surface-focused functional groups and low filler-rubber reactivity.
Innovation Solution
The development of core-shell structured polymer particles with a diene-based latex core and a graft shell containing a vinyl compound and an alkoxysilane derivative compound, which are used as a filler to enhance abrasion resistance, rolling resistance, and wet slip resistance, while improving specific gravity, tensile strength, and tensile elongation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If silica is used as a filler to improve abrasion resistance, then abrasion resistance is enhanced, but processing complexity increases and coupling agent consumption increases due to high filler-filler reactivity and low filler-rubber reactivity
Solution Approach 1:
The patent changes the chemical parameters of the filler by introducing a graft shell containing silane groups and vinyl groups onto the silica surface. This modification transforms the surface properties of silica, enabling it to react with rubber and change the overall chemical composition and reactivity parameters of the filler system, thereby reducing processing complexity while maintaining abrasion resistance
Solution Approach 2:
The patent creates a composite structure by forming a graft shell around the silica core. This composite material consists of silica particles with grafted polymer chains containing both silane and vinyl groups, combining the hardness and abrasion resistance of silica with the reactivity and processability of organic polymer groups
2Adaptability or versatility
If various rubber types are mixed to achieve proper balance between slip resistance and rolling resistance, then viscoelastic properties are improved, but mechanical properties such as tensile strength and tensile elongation deteriorate
Solution Approach 1:
The graft shell acts as an intermediary between the silica filler and the rubber matrix. It facilitates better interfacial bonding and stress transfer, allowing the rubber composition to achieve improved viscoelastic properties without sacrificing tensile strength and elongation that would normally result from using multiple rubber types
3Reliability
If high coupling agent quantity is used to achieve ideal curing property with silica, then filler-rubber reactivity is improved, but manufacturing cost increases
Solution Approach 1:
The patent performs preliminary action by pre-grafting the silane and vinyl groups onto the silica surface before mixing with rubber. This advance modification ensures that the filler is pre-equipped with the necessary reactive groups for optimal curing, eliminating the need for excessive coupling agents during the compounding and curing stages
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 core-shell structured polymer particles effectively enhance abrasion resistance, rolling resistance, and wet slip resistance while maintaining excellent mechanical properties, making them suitable for use in tire materials, thereby improving the lifespan and fuel efficiency of tires.
Implementation Method 1
a graft shell including a vinyl compound and an alkoxysilane derivative compound formed on the core
Implementation Method 2
enhancing abrasion resistance, rolling resistance and wet slip resistance of rubber
Implementation Method 3
a graft shell including a vinyl compound and an alkoxysilane derivative compound formed on the core
Data Source
AI summary
Provided are core-shell structured polymer particles capable of enhancing abrasion resistance, rolling resistance and wet slip resistance of rubber while improving mechanical properties such as tensile strength and tensile elongation, a rubber composition including the same, and a molded rubber article, for example, a tire, prepared therefrom. Such core-shell structured polymer particles are capable of enhancing abrasion resistance (lifespan property), rolling resistance (fuel efficiency performance) and wet slip resistance (brake performance) while providing excellent mechanical properties to rubber.Accordingly, the molded rubber article, for example, a tire, prepared from the rubber composition including the core-shell structured polymer particles is capable having an excellent lifespan property, fuel efficiency performance and brake performance while exhibiting excellent mechanical properties.