Fluorosilicone Elastomer Stabilizer for Heat and Oil Resistance
Solution Overview
Problem
Fluorosilicone elastomers used in automotive applications, such as o-rings and hoses, face challenges in achieving high heat stability and resistance to oils at elevated temperatures, with existing heat stabilizers providing limited thermal resistance and oil resistance.
Innovation Solution
A stabilizer composition comprising carbon black, calcium carbonate, iron oxide, and optionally zinc oxide is added to fluorosilicone elastomer base compositions, enhancing the heat aging and oil resistance of cured fluorosilicone elastomers, particularly for use in automotive applications like o-rings and turbocharger hoses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional heat stabilizers (cerium hydrate or hydroxides) are used in fluorosilicone elastomer formulations, then thermal resistance is improved, but resistance to oil at operating automotive temperatures deteriorates
Solution Approach 1:
The patent uses a composite stabilizer system combining carbon black (5-20 phr), calcium carbonate (10-30 phr), and iron oxide (5-20 phr) together with conventional heat stabilizers. This composite approach creates synergistic effects where carbon black provides thermal stability and oil resistance, calcium carbonate enhances heat stability and cost-effectiveness, and iron oxide contributes to both thermal stability and color stability, collectively improving both thermal and oil resistance
Solution Approach 2:
The patent optimizes the concentration ranges of each stabilizer component to achieve balanced performance: carbon black at 5-20 phr, calcium carbonate at 10-30 phr, and iron oxide at 5-20 phr. This parameter optimization ensures sufficient thermal resistance while maintaining oil resistance by distributing the stabilizing function across multiple components rather than relying on a single high-concentration additive
2Object-affected harmful factors
If fluorosilicone elastomers are used in automotive applications, then chemical exposure resistance is improved, but heat stability deteriorates compared to non-fluoro silicone elastomers
Solution Approach 1:
The patent applies a multi-component stabilizer system (carbon black, calcium carbonate, iron oxide, and conventional heat stabilizers) to fluorosilicone elastomers to compensate for their inherent heat stability deficiencies. This composite approach leverages the complementary strengths of each component: carbon black for thermal and UV stability, calcium carbonate for heat stability enhancement, and iron oxide for thermal and color stability, collectively raising the heat stability to match or exceed non-fluoro silicone elastomers
Solution Approach 2:
The patent applies stabilizers at specific concentration levels (carbon black 5-20 phr, calcium carbonate 10-30 phr, iron oxide 5-20 phr) to locally enhance the thermal properties of the fluorosilicone elastomer matrix. This localized quality enhancement through optimized additive packaging allows the bulk material to achieve improved heat stability while retaining the inherent chemical resistance of fluorosilicone
3Duration of action of stationary object
If stabilizer composition is added to fluorosilicone elastomer base compositions, then heat aging properties are improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple stabilizer functions into a single integrated stabilizer package that can be added as one formulation unit. The stabilizer composition containing carbon black, calcium carbonate, iron oxide, and conventional heat stabilizers is formulated together and added to the fluorosilicone elastomer base composition in a single mixing operation, simplifying the manufacturing process while providing comprehensive heat aging protection
Solution Approach 2:
The stabilizer composition serves multiple functions simultaneously: carbon black provides thermal stability and UV protection, calcium carbonate enhances heat stability and acts as a filler, iron oxide contributes to thermal stability and color consistency, and the conventional heat stabilizers provide additional thermal protection. This multi-functional stabilizer package addresses various degradation mechanisms in one additive system, reducing the number of separate formulations needed
Data Source
AI summary
Fluorosilicone elastomer base compositions are disclosed containing a stabilizer that provides cured fluorosilicone elastomers having improved high temperature performance. The stabilizer comprises carbon black, calcium carbonate, iron oxide, and optionally zinc oxide. The stabilizer is particularly useful to prepare cured fluorosilicone elastomers for o-rings, connectors, and constructing automotive hosing.