Acrylic Rubber Tire Bladder Heat Resistance
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Solution Overview
Problem
Conventional tire bladders face issues with insufficient heat resistance and short product life cycles.
Innovation Solution
A tire bladder made from an acrylic rubber composition containing 94.5 to 99.5 mass % of an alkyl (meth)acrylate-derived structural unit, 0.5 to 3 mass % of a monoalkyl maleate and/or monoalkoxyalkyl maleate-derived structural unit, 30 to 200 parts by mass of carbon black with specific particle diameter and oil absorption, 0.1 to 5 parts by mass of an imidazole compound as antioxidant, and 0.1 to 10 parts by mass of a polyamine compound as a vulcanizing agent, which enhances heat resistance and processing safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional rubber compositions are used for tire bladders, then processing is easier and cost is lower, but heat resistance is insufficient and product life cycle is short
Solution Approach 1:
The patent changes the chemical composition parameters of the rubber material by incorporating specific antioxidants (0.1-5 parts by mass) and vulcanizing agents (0.1-10 parts by mass) into the acrylic rubber composition. This chemical parameter modification enhances the rubber's heat resistance and extends its service life without compromising processability
Solution Approach 2:
The patent creates a composite rubber composition by combining acrylic rubber with carbon black (30-200 parts by mass), antioxidants, and vulcanizing agents. This composite structure provides synergistic effects that improve heat resistance and durability while maintaining the base rubber's desirable processing characteristics
2Strength
If acrylic rubber composition with high elongation at high temperature is used, then heat resistance and elongation at break are improved, but formulation complexity increases
Solution Approach 1:
The patent modifies the acrylic rubber's molecular structure by incorporating 0.5-3 mass % monoalkyl maleate and/or monoalkoxyalkyl maleate-derived structural units. This compositional parameter change enables the rubber to maintain high elongation (100% or more at 100°C) while the formulation remains relatively simple with clearly defined ingredient ranges
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 solution provides improved heat resistance and elongation at break in high-temperature conditions, thereby extending the life cycle of the tire bladder.
Implementation Method 1
0.1 to 5 parts by mass of an imidazole compound as antioxidant
Implementation Method 2
0.1 to 10 parts by mass of a vulcanizing agent, wherein the vulcanizing agent is a polyamine compound
Implementation Method 3
30 to 200 parts by mass of a carbon black having an arithmetic average particle diameter, as determined by JIS-Z8901, of 20 to 30 nm and a DBP oil absorption of 70 to 130 ml/100 g
Data Source
AI summary
Provided is a tire bladder of an acrylic rubber composition which is superior in processing safety and mechanical characteristics and further exhibits high elongation in a high temperature atmosphere. A tire bladder of an acrylic rubber composition comprising: 100 parts by mass of an acrylic rubber containing 94.5 to 99.5 mass % of an alkyl (meth)acrylate-derived structural unit and 0.5 to 3 mass % of a monoalkyl maleate and/or monoalkoxyalkyl maleate-derived structural unit; 30 to 200 parts by mass of a carbon black having an arithmetic average particle diameter, as determined according to JIS-Z8901, of 20 to 30 nm and a DBP oil absorption of 70 to 130 ml/100 g; 0.1 to 5 parts by mass of an imidazole compound as antioxidant and 0.1 to 10 parts by mass of a polyamine compound as vulcanizing agent.