Continuous Diene Elastomer Synthesis with Species Distribution Control
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Solution Overview
Problem
Current processes for modifying diene elastomers are not economically competitive or flexible enough for industrial production, lacking control over the distribution of species, which affects the mechanical and dynamic properties of rubber compositions used in tires.
Innovation Solution
A continuous process for synthesizing a diene elastomer modified with a trialkoxysilane functionalization agent, characterized by a specific kinetic model and residence time distribution, allowing precise control over the distribution of species and improving the elastomer's properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If batch processes are used to control the distribution of species within modified elastomer, then manufacturing precision is improved, but productivity deteriorates
Solution Approach 1:
The patent applies continuous processing instead of batch processing to maintain species distribution control while improving productivity. The continuous functionalization process allows for consistent reaction conditions and steady-state operation, enabling both precise control and high-volume production suitable for industrial applications.
2Productivity
If continuous process is used for industrial production, then productivity is improved, but manufacturing precision deteriorates
Solution Approach 1:
The patent employs parameter optimization in the continuous process, specifically controlling the residence time distribution and kinetic parameters to achieve desired species distribution. By carefully selecting and maintaining optimal parameter ranges, the continuous process achieves both high productivity and precise manufacturing control.
3Strength
If functionalization is performed to improve mechanical and dynamic properties, then strength is improved, but device complexity increases
Solution Approach 1:
The patent segments the functionalization process into distinct reaction stages within the continuous system, allowing control over the distribution of functional groups along the polymer chains. This segmentation enables targeted modification to improve mechanical properties while managing process complexity through modular reactor design.
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 process enhances the mechanical and dynamic properties of rubber compositions, making them suitable for tire applications while being economically viable and adaptable to industrial production.
Implementation Method 1
anionic polymerization of at least one conjugated diene monomer in the presence of an initiator of polymerization
Implementation Method 2
modification of the diene elastomer in a functionalization device, by bringing the living diene elastomer carrying an active site obtained in the previous step into contact in one step with a non-polymerizable functionalization agent comprising (a) where appropriate, a function capable of interacting with a reinforcing filler and (b) a trialkoxysilane group
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
The present invention relates to a continuous synthesis method for a diene elastomer incorporating a step for modifying the diene elastomer in a functionalisation device, said step being characterised by: - a kinetic model according to which the ratio of the kinetic constants is greater than 1, and - a flow reflected by a residence time distribution in the functionalisation device expressed according to equations 1 or 3: (i) in a functionalisation device with at least one tubular continuous reactor or with at least one cascade of at least two stirred reactors (Eq. 1), (ii) in a functionalisation device that is a combination of device (i) and a device with at least one continuous stirred reactor, having a residence time distribution characterised by the following equation (Eq. 2), the device (ii) having a residence time distribution characterised by the following equation 3, which is the result of the convolution of equations 1 and 2 (Eq. 3).