Acrylic Rubber Sealing Composition for Low Compression Set

The patent changes the chemical composition parameters by replacing silicone resin with acrylic rubber containing specific functional groups (carboxyl, hydroxyl, or amine groups) that prevent compression set and sweating while maintaining heat resistance. This parameter change in material composition directly resolves the contradiction between heat resistance and sealing performance reliability.

The patent uses composite materials by combining acrylic rubber with specific functional groups and crosslinking agents to create a sealing material that integrates the benefits of heat resistance and low compression set. The composite structure of acrylic rubber with functional groups and crosslinked networks provides both thermal stability and resistance to compression set, eliminating the sweating phenomenon.

The patent modifies the chemical parameters of acrylic rubber by introducing specific functional groups (carboxyl, hydroxyl, amine) and controlling molecular weight and glass transition temperature. These parameter changes enhance both compression set resistance and oil resistance simultaneously, resolving the contradiction between these two properties.

The patent applies local quality by introducing specific functional groups at specific locations within the acrylic rubber molecular structure. The carboxyl, hydroxyl, or amine groups are strategically positioned to provide both compression set resistance and oil resistance, allowing different regions of the material to have specialized functions that resolve the contradiction.

The patent utilizes phase transitions by employing a liquid sealing material that cures to form a solid gasket. The material is applied in liquid form for easy automation and incorporation, then undergoes photopolymerization or chemical curing to transition to a solid state that provides reliable sealing. This phase transition resolves the contradiction between ease of operation and sealing reliability.

The patent replaces mechanical solid packing systems with a chemical curing system. Instead of using pre-formed solid gaskets that require mechanical installation, the invention uses a liquid material that cures in-place through chemical reactions (photopolymerization or moisture curing), enabling automation and simplifying incorporation while maintaining sealing effectiveness.

The patent uses composite materials by incorporating fillers, reinforcement agents, and crosslinking agents into the liquid sealing material formulation. These additives create a composite structure that forms a durable, thick sealing layer rather than a thin film, providing both automation compatibility and long-term durability under severe conditions.

The patent changes the formulation parameters of the liquid sealing material by adjusting viscosity, solid content, and curing characteristics. These parameter changes ensure that the material forms a sufficiently thick and durable sealing layer while remaining applicable through automated coating processes, resolving the contradiction between automation and durability.