Random Copolymer Rubber Composition for Tire Heat Resistance
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Solution Overview
Problem
Current rubber compositions comprising copolymers of conjugated diene compounds and non-conjugated olefins lack random arrangement of monomer units, which affects their heat resistance and crack growth resistance properties, and existing technologies do not effectively utilize these properties for manufacturing high-performance tires.
Innovation Solution
A rubber composition is developed with a copolymer of a conjugated diene compound and a non-conjugated olefin, specifically ethylene, propylene, or 1-butene, that has randomly arranged monomer units, using a metallocene-based catalyst to create a random structure without crystallization temperature, and is combined with reinforcing fillers and crosslinking agents to enhance heat resistance and crack growth resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a copolymer of conjugated diene compound and non-conjugated olefin is used with conventional polymerization methods, then the rubber can be manufactured, but the monomer units are not randomly arranged, resulting in poor heat resistance and crack growth resistance
Solution Approach 1:
The patent changes the polymerization parameters by introducing a specific catalyst system (metallocene complex with aluminoxane) and controlling polymerization conditions (temperature, monomer ratio, solvent) to achieve random monomer arrangement. This parameter change transforms the conventional ordered structure into a random copolymer structure, improving heat resistance and crack growth resistance
Solution Approach 2:
The patent creates a composite polymer structure by copolymerizing conjugated diene compound and non-conjugated olefin in a random arrangement. This composite material combines the advantages of both monomers: the elasticity and tensile strength from conjugated diene and the heat resistance from non-conjugated olefin, achieving superior overall performance
2Reliability
If block sequence including non-conjugated olefin monomer units is present in the copolymer, then the copolymer can be formed, but crystallization temperature appears which reduces crack growth resistance
Solution Approach 1:
The patent严格控制 polymerization parameters including maintaining specific temperature ranges (0-100°C), controlling monomer feed ratios, and using specific catalyst concentrations to prevent block sequence formation. These parameter changes ensure random monomer distribution and eliminate crystallization structures, improving crack growth resistance
Solution Approach 2:
The patent creates a random copolymer structure that copies the randomness of monomer insertion during polymerization, preventing any regular or block-like patterns. This random copying of monomer arrangement throughout the polymer chain ensures no crystallization regions form, maintaining amorphous structure and superior crack growth resistance
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 rubber composition exhibits improved heat resistance and crack growth resistance, enabling the production of high-performance tires with enhanced physical properties and durability.
Implementation Method 1
A rubber composition is developed with a copolymer of a conjugated diene compound and a non-conjugated olefin, specifically ethylene, propylene, or 1-butene, that has randomly arranged monomer units, using a metallocene-based catalyst to create a random structure without crystallization temperature
Data Source
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AI summary
Provided is a copolymer of a conjugated diene compound and a non-conjugated olefin, the copolymer being a random copolymer including randomly arranged monomer units of the conjugated diene compound and of the non-conjugated olefin, in which the non-conjugated olefin is preferably an acyclic olefin, the non-conjugated olefin preferably has 2 to 10 carbon atoms, and specific examples of the non-conjugated olefin preferably include ethylene, propylene, and 1-butene.