Special chemical company LANXESS has developed Vibrathane 7085, a new polyester prepolymer for hot-cast elastomers. It has an MDI end group (diphenylmethane diisocyanate) that can be cured with 1,4-butanediol to cast polyurethane. Elastomers, which are characterized by low compression set and high tear strength at 83 to 87 Shore A hardness. Dr. Nitin Sharma, expert at the global R&D and innovation center of LANXESS's Polyurethane Systems Business Unit, stated that 'this is material' Characteristics, both performances have a negative effect, so they cannot be optimized at the same time. 'General-purpose prepolymers can be produced at lower cost with catalytic action to meet a wider range of elastomer requirements. Sharma added: 'Related applications Bushings including die-cut felts and anvils, torque rods for trucks, buses and trailers, and sound-absorbing vibrating screens for ore processing.
Low fatigue tendency under alternating load
According to ASTM D395 (American Society of Materials and Testing) Method B (70°C, 22 hours), Vibrathane 7085 can produce a cast elastomer with a compression modulus of 13% to 42% under different processing conditions. According to ASTM D1938 (Tear Strength) , Pants type) showed a tear strength between 27.2 and 85.9 kN/m. Sharma said 'compared with a standard polyurethane elastomer with similar hardness, the compression deformation is about 1.7 times lower and the tear strength is as high as 3 times'. , Fatigue strength is at a high level. Tests according to ASTM D3629-99 show Texus Flex values exceeding 170,000 and 102% stoichiometry at 11%, 18%, 35%, and 45% deformation.
Higher productivity, lower energy consumption
By using a catalyst, the reaction speed of the prepolymer and the chain extender is faster, parts can be demolded and filled faster. Sharma said that 'the processor can increase the production of parts and thus increase the production efficiency.' In addition, the optimized processing conditions Helps to shorten the post-cure time, thereby reducing energy consumption, saving costs and increasing the sustainability of production. The pot life can be maintained at 90 seconds, or can be extended to about 4.5 minutes to achieve even more complex component geometry filling. In addition, the processor delays the post-curing of the demolded parts without affecting tear strength, compression set, or other mechanical properties. Sharma explains that, therefore, demoulding parts can be collected first and then post-cured together to increase flexibility and production. effectiveness' .
Compression and tear strength can be individually optimized
Both compression and tear strength can be individually optimized to meet specific requirements. For example, the tear strength can be increased to 85.9 kilonewtons per meter, but the compressive deformation is 42%. In contrast, the elastomeric compressive deformation is 15%. But the dynamic characteristics are excellent. Sharma: 'So, this material is particularly suitable for dynamic high-stress components, such as the wheels and rollers of forklifts'
Forward-looking statements
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