Modified Conjugated Diene Polymer Low Heat Build-Up
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Solution Overview
Problem
Current methods for producing modified conjugated diene polymers, particularly for tire applications, face limitations in achieving low heat build-up, reinforcement effects, and improved mechanical characteristics, especially when using silica or carbon black fillers, with insufficient modification effects on cis-1,4-polybutadiene.
Innovation Solution
A process involving the modification of a conjugated diene polymer with a high cis-1,4 bond content using an alkoxysilane compound and a condensation accelerator containing titanium, in an aqueous solution at specific pH and temperature conditions, to enhance the polymer's interaction with fillers and improve its properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an organolithium compound with an alkoxysilane derivative is used to modify the polymerization active terminal of a conjugated diene polymer, then the modification effect is improved, but the low heat build-up and reinforcement effect with filler are insufficient
Solution Approach 1:
The patent changes the chemical parameters of the modification reaction by using a silane coupling agent with specific functional groups (epoxy, carboxyl, or isocyanate groups) instead of conventional alkoxysilane derivatives. This parameter change in the chemical structure and reactivity of the modifying agent enables better interaction with fillers and reduces heat build-up in the rubber composition
Solution Approach 2:
The patent creates a composite modification system where the silane coupling agent acts as an intermediary between the polymer and filler. The modified conjugated diene polymer forms a composite structure with improved interfacial bonding to fillers, achieving both low heat build-up and excellent reinforcement effect simultaneously
2Productivity
If a condensation accelerator is added to the reaction system during alkoxysilane modification, then the modification efficiency is improved, but the performance of the resulting modified conjugated diene polymer is still insufficient
Solution Approach 1:
The patent changes the type of condensation accelerator from conventional catalysts to a specific compound containing titanium. This parameter change in the catalyst system improves both the efficiency of the modification reaction and the overall performance of the modified polymer, resolving the contradiction between productivity and reliability
3Stability of the object's composition
If a rare earth catalyst is used to obtain a conjugated diene polymer with high cis content, then the polymer structure is improved, but the modification effect with functional group-containing alkoxysilane derivative is limited
Solution Approach 1:
The patent changes the functional groups on the silane coupling agent to include epoxy, carboxyl, or isocyanate groups, which have different reactivity patterns compared to conventional alkoxysilane derivatives. This parameter change enables effective modification of high-cis conjugated diene polymers that were previously difficult to modify
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 results in a modified conjugated diene polymer that exhibits improved low heat build-up, mechanical characteristics, and wear resistance, along with excellent processability, making it suitable for rubber compositions that require reduced rolling resistance and enhanced performance in tire applications.
Implementation Method 1
subjecting the alkoxysilane compound (residue) to a condensation reaction in an aqueous solution at a pH of 9 to 14 and a temperature of 85 to 180°C in the presence of a condensation accelerator including a compound containing titanium
Data Source
AI summary
A process for producing a modified conjugated diene polymer includes subjecting an active terminal of a conjugated diene polymer having a vinyl content of less than 10% and a cis-1,4 bond content of 75% or more to a modification reaction with an alkoxysilane compound, and subjecting the alkoxysilane compound (residue) to a condensation reaction in an aqueous solution at a pH of 9 to 14 and a temperature of 85 to 180°C in the presence of a condensation accelerator including a compound containing titanium. The modified conjugated diene polymer exhibits low heat build-up and increased reinforcing properties when used for a rubber composition, and exhibits excellent wear resistance, mechanical characteristics, and processability.