Acrylic Rubber Composition for Cold-Resistant Bonded Piston Seals
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Solution Overview
Problem
Conventional acrylic rubber compositions used in bonded piston seals face challenges in low temperature environments, particularly below -30°C, due to their low glass transition point, which affects roll processability and adhesion.
Innovation Solution
An acrylic rubber composition incorporating 5 to 12.5 parts by weight of silica and 5 to 15 parts by weight of graphite as fillers, based on ultracold-resistant acrylic rubber with a glass transition point of -42°C or lower, enhances the seals' performance in low temperature environments while maintaining roll processability and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If acrylic rubber with low glass transition point is used to withstand low temperature environment, then cold resistance is improved, but roll processability and adhesion deteriorate
Solution Approach 1:
The patent changes the chemical composition parameters of the acrylic rubber by incorporating specific copolymer components (acrylonitrile, vinyl chloroacetate, allyl chloroacetate) in controlled ratios. This modifies the glass transition point to -42°C or lower while maintaining processing properties through the balanced composition design
Solution Approach 2:
The patent creates a composite rubber material by combining multiple polymer components (acrylic rubber base, copolymer components) with specific fillers (silica, graphite) and curing agents. This composite structure achieves both low-temperature resistance and improved roll processability through synergistic material interactions
2Reliability
If acrylic rubber with low glass transition point is used to withstand low temperature environment, then cold resistance is improved, but adhesion deteriorates
Solution Approach 1:
The patent modifies the chemical parameters by incorporating functional groups (vinyl chloroacetate, allyl chloroacetate) that enhance adhesion properties while maintaining the low glass transition point through controlled copolymerization ratios
Solution Approach 2:
The composite formulation includes silica and graphite fillers that improve adhesion, along with specific curing agents that create strong crosslinked structures. This composite approach maintains cold resistance while significantly improving adhesion strength
3Ease of manufacture
If conventional acrylic rubber composition is used, then roll processability is maintained, but cold resistance below -30°C is insufficient
Solution Approach 1:
The patent achieves superior cold resistance by lowering the glass transition point to -42°C or lower through specific copolymer composition design, while the controlled formulation maintains acceptable roll processability
Solution Approach 2:
The use of composite materials with specific filler combinations (silica 5-12.5 parts, graphite 5-15 parts per 100 parts rubber) enhances cold resistance without significantly compromising roll processability
Data Source
AI summary
An acrylic rubber composition comprising 5 to 12.5 parts by weight of silica and 5 to 15 parts by weight of graphite as fillers, based on 100 parts by weight of ultracold-resistant acrylic rubber having a glass transition point Tg of −42° C. or less. Due to the use of ultracold-resistant acrylic rubber, the use environment temperature, i.e., −30 to +150° C., is satisfied. In addition, the respective use of specific amounts of silica and graphite as fillers allows the formation of bonded piston seals that have roll processability and adhesion equivalent to or higher than those of the existing seals, and that satisfy compression set characteristics.