In-situ Polymer Blend for Tire Rolling Resistance
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Solution Overview
Problem
Existing synthetic rubber blends for tires fail to adequately reduce fuel consumption and carbon dioxide emissions due to high rolling resistance, and do not meet performance criteria for safety and grip properties under various conditions.
Innovation Solution
A method for preparing a synthetic rubber blend by polymerizing conjugated diene monomers and alpha olefin monomers in stages with polymerization initiators and polar agents, resulting in a blend of high molecular weight and low molecular weight polydienes with improved properties, including reduced heat build-up and enhanced grip and handling performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If conventional synthetic rubber blends are used, then the tire structure is simple and easy to manufacture, but the rolling resistance is high leading to increased fuel consumption and CO2 emissions
Solution Approach 1:
The polymerization process is divided into two distinct stages: first stage polymerization produces high molecular weight polydiene with specific properties, while second stage polymerization produces low molecular weight polydiene. This segmentation allows each stage to be optimized independently for different performance requirements, ultimately reducing rolling resistance and fuel consumption while maintaining manufacturability
Solution Approach 2:
The high molecular weight polydiene is prepared in advance through first stage polymerization with high conversion rate (≥95%), and then serves as the base for second stage polymerization. This preliminary action ensures that the molecular weight distribution and composition are controlled from the beginning, leading to optimized rolling resistance and reduced energy loss
2Object-affected harmful factors
If conventional synthetic rubber blends are used, then the manufacturing process is simple, but the heat generation performance is poor (high HBU)
Solution Approach 1:
The polymerization is segmented into two stages with different conditions: first stage uses high conversion rate (≥95%) to produce high molecular weight polydiene with controlled structure, while second stage produces low molecular weight polydiene. This segmentation enables optimization of molecular weight distribution and microstructure to reduce hysteresis loss and heat build-up in the tire
Solution Approach 2:
Different polymerization parameters are used in each stage: first stage uses high conversion rate (≥95%) and specific monomer ratios to control molecular weight and microstructure, while second stage uses different parameters to produce low molecular weight fraction. These parameter changes optimize the polymer structure for reduced heat generation while managing process complexity
3Reliability
If conventional synthetic rubber blends are used, then the composition is simple, but the grip performance (wet grip, snow grip, dry handling) is insufficient
Solution Approach 1:
The polymerization process is segmented into two stages producing high and low molecular weight polydienes with different microstructures. The high molecular weight fraction provides structural integrity while the low molecular weight fraction enhances adhesion and grip. This segmentation allows independent optimization of each fraction's properties to achieve superior overall grip performance across wet, snow, and dry conditions
Solution Approach 2:
The invention creates a composite polymer system by combining high molecular weight polydiene (first stage product) and low molecular weight polydiene (second stage product) in a controlled blend. This composite structure leverages the advantages of both molecular weight ranges: the high molecular weight provides strength and stability, while the low molecular weight enhances flexibility and adhesion, resulting in improved reliability for grip performance
4Strength
If high molecular weight polydiene is used alone, then the structural strength is good, but the rolling resistance and heat build-up performance are poor
Solution Approach 1:
The invention creates a composite polymer system by combining high molecular weight polydiene (first stage product) and low molecular weight polydiene (second stage product) in a controlled blend. This composite structure leverages the advantages of both molecular weight ranges: the high molecular weight provides strength and stability, while the low molecular weight enhances flexibility and adhesion, resulting in improved reliability for grip performance
Solution Approach 2:
Different regions of the polymer blend have different molecular weight characteristics: the high molecular weight polydiene provides structural strength in load-bearing regions, while the low molecular weight polydiene improves energy dissipation and reduces rolling resistance. This local quality differentiation optimizes both strength and energy loss characteristics throughout the tire structure
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 method produces a synthetic rubber blend with improved rolling resistance, dry handling, snow grip, and wet grip performance, addressing the limitations of prior art compositions by achieving a single glass transition temperature and enhanced compatibility of polymer components.
Implementation Method 1
polymerizing at least one conjugated diene monomer and, optionally, one or more alpha olefin monomers, including aromatic vinyl and vinyl silane monomers, in the presence of one or more polymerization initiators
Implementation Method 2
in the presence of one or more polymerization initiators and, optionally, a polar agent in an organic solvent
Data Source
AI summary
The present invention relates to a method for the preparation of a synthetic rubber blend, wherein the blend comprises a high molecular weight polydiene (A) and a low molecular weight polydiene (B). The present invention further relates to a synthetic rubber blend obtainable according to the method described herein; as well as to rubber compositions comprising the blend; and articles, such as tires.