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Development status of sealing technology and analysis of its gap with ultra-polymer technology

by:ORK      2022-11-11
The application of new materials and new processes has promoted the rapid development of rubber-plastic sealing technology, which not only enables the rubber material to have good low friction properties, but also enables the rubber seals material to have high strength and other mechanical properties. For example, in the 1970s, the American DuPont Company developed fluoroelastomer Kalrez (called perfluoroether rubber), and Japan's Daikin Company and the former Soviet Union also developed such products. The rubber has the heat resistance and chemical stability of polytetrafluoroethylene, and can resist all solvents except fluorine solvents. The sealing products processed by perfluoroether rubber can be used for a long time at 260~290℃, and the intermittent use temperature can reach 315℃. It is currently the best heat-resistant fluororubber. Special engineering elastomers (ACM, ECO, FKM, HNBR, etc.) can replace low-performance oil-resistant rubber such as NBR under special working conditions; low-friction modification treatment is performed on the rubber surface, such as spraying PTFE fluoroplastic coating or using FEP (fluoroplastics). Fluoroplastics such as propylene) and PFA (perfluorinated compounds) are coated with rubber to manufacture low-friction, high-wear-resistance rubber, and improve product resistance to media (solvent, strong acid, strong alkali), as well as compression and temperature resistance grades; rubber seals and plastic materials The extreme modification and nanotechnology modification can improve the mechanical properties of rubber seals and plastic materials and impart some special functions. The high-performance perfluoroelastomer FFKM developed and produced by DuPont has the advantages of high temperature resistance, gas resistance and strong chemical corrosion, good elasticity, low compression set, and good elasticity. It is used in chemical, food, printing, semiconductor and other industries. At the same time, the application of new materials and new processes also makes engineering plastics have excellent tribological properties, chemical stability and temperature resistance, mainly including: (1) High performance of polyurethane (PU) materials: First, improve its High and low temperature performance, compression set performance and medium resistance performance, such as Parker's modified PU can withstand 120 ℃ for a long time. The second is to carry out low-friction modification of PU, such as PU92AU21100 obtained by infiltration of self-lubricating materials exclusively by Simrit Company, which has good lubricity and ultra-low temperature resistance up to 20K (-253℃). (2) Polytetrafluoroethylene (PTFE) composite modification and application: In order to overcome some of the physical properties of PTFE, the PTFE material is used as the matrix to be composited with various organic or inorganic fillers, such as graphite, copper powder, carbon fiber ( CF), polyimide (PI), polyetheretherketone (PEEK), polyoxymethylene (POM) and polyphenylene sulfide (PPS) and other materials are compounded to develop products suitable for different applications. Expanded polytetrafluoroethylene is a new material with strong, tough, porous and highly fibrous formed by stretching and expanding polytetrafluoroethylene. High friction coefficient, wide operating temperature, and its microfiber internal structure make its products have unimaginable toughness. (3) Application of ultra-high molecular weight polyethylene (UHMWPE): UHMWPE has excellent properties such as self-lubrication, wear resistance, impact resistance, solvent resistance, low temperature resistance, non-stick, hydrophobicity and hygiene, and is used to manufacture wear-resistant transportation and equipment linings , Mechanical parts, such as bulldozer scraper, excavator lining, self-unloading ship warehouse lining board, are widely used. https://www.orksealing.com/
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