Cobalt Catalyst System for Controllable 1,4-trans Polybutadiene Molecular Weight
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Solution Overview
Problem
Conventional methods for synthesizing 1,4-trans polybutadiene result in high molecular weight polymers that are difficult to process due to high Mooney viscosity, as the molecular weight of the polymer is not controllable.
Innovation Solution
A catalyst system comprising a cobalt compound, an organoaluminum compound, a phenol-based compound, and a phosphorus-based compound is used to polymerize 1,3-butadiene, allowing for the control of molecular weight and increasing the yield of 1,4-trans polybutadiene with high trans content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional catalyst systems (vanadium compound + alkyl aluminum or cobalt carboxylate + alkyl phenol) are used to synthesize 1,4-trans polybutadiene, then high trans content is achieved, but the molecular weight becomes uncontrollably high resulting in high Mooney viscosity that prevents processing
Solution Approach 1:
The patent changes the chemical parameters of the catalyst system by introducing a phosphorus-based compound (specifically a dialkyl phosphite or cyclic phosphite) in combination with cobalt carboxylate and alkyl phenol. This parameter change in catalyst composition enables control over molecular weight while maintaining high trans content, resolving the contradiction between composition stability and ease of operation
Solution Approach 2:
The patent creates a composite catalyst system combining cobalt carboxylate, alkyl phenol, and phosphorus-based compounds. This composite catalyst achieves both high trans content and controllable molecular weight, simultaneously improving composition stability and processability that were previously contradictory
2Stability of the object's composition
If conventional catalyst systems are used to synthesize 1,4-trans polybutadiene, then high trans content is achieved, but the molecular weight is not controllable leading to high Mooney viscosity
Solution Approach 1:
The patent modifies the catalyst system parameters by adding phosphorus-based compounds (dialkyl phosphites or cyclic phosphites) to the cobalt carboxylate and alkyl phenol system. This parameter change enables precise control of molecular weight while preserving high trans content, resolving the contradiction between composition stability and manufacturing precision
Solution Approach 2:
The phosphorus-based compound acts as an intermediary in the catalyst system that mediates between the cobalt carboxylate and alkyl phenol components. This intermediary enables independent control of molecular weight without affecting trans content, achieving both composition stability and manufacturing precision
3Stability of the object's composition
If high molecular weight 1,4-trans polybutadiene is produced using conventional catalysts, then high trans content is achieved, but the Mooney viscosity becomes too high for rubber processing
Solution Approach 1:
The patent changes the catalyst composition parameters by incorporating phosphorus-based compounds (dialkyl phosphites or cyclic phosphites) with cobalt carboxylate and alkyl phenol. This enables production of 1,4-trans polybutadiene with controlled molecular weight and acceptable Mooney viscosity while maintaining high trans content, thus improving both composition stability and productivity
Solution Approach 2:
The patent develops a composite catalyst system combining cobalt carboxylate, alkyl phenol, and phosphorus-based compounds that produces polybutadiene with balanced properties - high trans content for composition stability and controlled molecular weight for improved processability and productivity
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 catalyst system enables the production of 1,4-trans polybutadiene with controlled molecular weight and high yield, improving processability and reducing Mooney viscosity, resulting in a rubber composition with enhanced physical properties such as tensile strength and tear strength.
Implementation Method 1
1,4-trans polybutadiene is synthesized by polymerizing a butadiene monomer using a Ziegler-Natta catalyst system including a vanadium compound and alkyl aluminum
Data Source
AI summary
Provided are a molecular weight controllable, high 1,4-trans polybutadiene catalyst system, and more particularly, a four-component catalyst for preparing 1,4-trans polybutadiene with high yield, the catalyst comprising a cobalt compound, an organoaluminum compound, a phenol-based compound, and a phosphorus-based compound used to prepare 1,4-trans polybutadiene by polymerizing butadiene or a butadiene derivative, and capable of controlling the molecular weight of 1,4-trans polybutadiene by regulating the amount of the phosphorus-based compound. In particular, 1,4-trans polybutadiene may be efficiently applied to tires, belts, or the like since it has excellent tensile strength, tear strength, and cut & chip properties with increasing processability.