Fluororubber Composition for High-Temperature Strength Retention
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Solution Overview
Problem
Existing fluororubber compositions fail to provide crosslinked articles with both heat resistance and excellent mechanical properties at high temperatures.
Innovation Solution
A fluororubber composition comprising fluororubber, carbon black, and an aromatic petroleum resin, with specific molecular ratios and processing conditions to achieve a shear modulus difference of not lower than 120 kPa and not higher than 3,000 kPa, enhancing mechanical properties and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional fluororubber compositions are used, then heat resistance is achieved, but mechanical properties at high temperatures deteriorate
Solution Approach 1:
The invention uses a composite material system comprising fluororubber (A) combined with specific additives including carbon black (B), aromatic petroleum resin (E), and other components in controlled amounts. This composite approach allows the base fluororubber to provide heat resistance while the composite structure with optimized components enhances mechanical properties at high temperatures, resolving the contradiction between heat resistance and high-temperature strength
Solution Approach 2:
The invention optimizes specific parameters including the difference in shear modulus δG′ (G′(1%)−G′(100%)) between small and large deformations, controlling it within 120-3,000 kPa. It also controls the ratio of aromatic petroleum resin to total components at 0.1-10 mass%, and optimizes carbon black content at 5-50 parts by weight per 100 parts fluororubber. These parameter optimizations enable simultaneous achievement of heat resistance and improved mechanical properties at elevated temperatures
2Reliability
If fluororubber composition is crosslinked for heat resistance, then compression set resistance improves, but mechanical properties at high temperatures worsen
Solution Approach 1:
The invention controls the crosslinking degree and network structure parameters to achieve optimal balance. By controlling the shear modulus difference δG′ within 120-3,000 kPa and optimizing the crosslinking system with specific catalysts and activators, the composition achieves sufficient compression set resistance while maintaining or enhancing mechanical properties at high temperatures through optimized crosslinking density and network architecture
Solution Approach 2:
The crosslinked fluororubber forms a composite material system where the crosslinked network provides compression set resistance while embedded carbon black and aromatic petroleum resin components contribute to high-temperature mechanical strength. This multi-component composite structure allows simultaneous optimization of both compression set resistance and high-temperature mechanical properties
Data Source
AI summary
Provided is a fluororubber composition capable of providing a crosslinked fluororubber article that exhibits not only heat resistance, but also excellent mechanical properties at high temperatures. The fluororubber composition includes a fluororubber (A), a carbon black (B), and an aromatic petroleum resin (E), and the fluororubber composition has a difference δG′ (G′ (1%)−G′ (100%)) of not lower than 120 kPa and not higher than 3,000 kPa, where G′ (1%) denotes a shear modulus at a dynamic strain of 1%, G′ (100%) denotes a shear modulus at a dynamic strain of 100%, and G′ (1%) and G′ (100%) are determined by a dynamic viscoelasticity test carried out on an unvulcanised rubber with a rubber process analyzer (RPA) in a condition that the measurement frequency is 1 Hz and the measurement temperature is 100° C.