Conjugated Diene Polymer Stabilization for Mooney Viscosity Retention
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Solution Overview
Problem
Conjugated diene rubber compositions exhibit poor Mooney viscosity stability during storage, which affects their processability and performance in tire applications.
Innovation Solution
Incorporating specific stabilizers, including hindered phenol-based and aromatic amine-based stabilizers, along with tin and/or silicon atoms, into the conjugated diene polymer to enhance Mooney viscosity stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conjugated diene polymer with siloxane modification is used to achieve low heat buildup and high wet grip, then the cross-linked rubber properties are improved, but the Mooney viscosity stability during storage deteriorates
Solution Approach 1:
The patent changes the chemical composition parameters by introducing specific stabilizer compounds (hindered phenol-based stabilizer and aromatic amine-based stabilizer) in controlled amounts (0.01-5 parts and 0.01-2 parts per 100 parts polymer, respectively). These parameter changes prevent unwanted side reactions while maintaining the desired cross-linked rubber properties, thus resolving the contradiction between improved reliability and maintained stability.
Solution Approach 2:
The stabilizers act as intermediary substances that mediate between the conjugated diene polymer and environmental factors (oxygen, moisture, heat) during storage. The hindered phenol-based stabilizer and aromatic amine-based stabilizer work together to prevent degradation reactions, allowing the polymer to maintain its Mooney viscosity stability while still achieving the desired cross-linked rubber properties when processed.
2Stability of the object's composition
If stabilizers are added to improve Mooney viscosity stability, then storage stability is improved, but the complexity of the polymer composition increases
Solution Approach 1:
The patent optimizes the concentration parameters of stabilizers to very low levels (0.01-5 parts per 100 parts polymer), which maintains Mooney viscosity stability while minimizing the impact on composition complexity. This parameter optimization allows the system to achieve stability improvement with minimal added complexity.
Solution Approach 2:
The selected stabilizers serve multiple functions: they prevent oxidation, maintain Mooney viscosity stability, and do not interfere with the cross-linking process. This multi-functionality reduces the need for additional specialized additives, thereby limiting the increase in composition complexity while achieving the desired stability improvement.
Data Source
AI summary
Provided is a stabilized conjugated diene polymer having excellent Mooney viscosity stability during storage. Provided is a stabilized conjugated diene polymer comprising a conjugated diene polymer containing at least one of a tin atom and a silicon atom, two or more hindered phenol-based stabilizers, and an aromatic amine-based stabilizer.