Conjugated Diene Polymer Functionalization for Silica Tire Compounds
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional conjugated diene-based polymers used in automobile tires exhibit poor processability and durability, especially when silica is used as a filler, despite their superior fuel efficiency performance.
Innovation Solution
A method for producing a conjugated diene-based polymer involving multiple steps of polymerization initiator addition and modification with agents having specific functional groups, resulting in a polymer with enhanced molecular weight distribution and improved interaction with fillers, such as silica.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional conjugated diene-based polymers are used with silica filler, then fuel efficiency is improved, but processability and durability deteriorate
Solution Approach 1:
The patent applies local quality by introducing modifying agents with specific functional groups (isocyanate, carboxylic acid, hydroxyl, amino) at specific locations within the polymer structure. These functional groups are incorporated during polymerization to create localized reactive sites that selectively interact with silica filler, improving processability and durability without compromising the overall fuel efficiency benefits of the conjugated diene-based polymer structure.
Solution Approach 2:
The patent creates a composite material system by combining conjugated diene-based polymer units with modifying agent units that have specific functional groups. This composite structure enables the polymer to interact effectively with silica filler through the functional groups, resolving the contradiction between fuel efficiency and processability/durability by integrating multiple material properties into a single polymer composition.
2Ease of operation
If modifying agents are added during polymerization, then processability is improved, but molecular weight distribution becomes complex
Solution Approach 1:
The patent applies preliminary action by incorporating the modifying agents during the polymerization process itself, rather than as a subsequent modification step. This allows the functional groups to be integrated into the polymer chains at controlled stages, improving processability while managing molecular weight distribution complexity through staged addition and controlled reaction conditions.
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 polymer with excellent processability and durability, enhancing fuel efficiency and wet grip properties while maintaining superior fuel efficiency performance.
Implementation Method 1
a polymerization initiator is added to a monomer including a conjugated diene compound in a hydrocarbon solvent to obtain a polymerization solution
Implementation Method 2
the polymer with the active end is reacted with a modifying agent having a functional group that is reactive with the active end, to introduce the modifying agent-based unit at the end of the polymer
Data Source
Figure 1
Figure 2
AI summary
The method for producing a conjugated diene-based polymer of the invention comprises step 1 in which a polymerization initiator is added to a monomer including a conjugated diene compound in a hydrocarbon solvent to obtain a polymerization solution, and step 2 in which a polymerization initiator is further added to the polymerization solution either once or two or more times to obtain a polymer with an active end, wherein in step 1 and/or step 2, a modifying agent is added which has a functional group that is copolymerizable with the conjugated diene compound.