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Lanxess unveils Vibrathane 7085 prepolymer for elastomers
24 Apr '18
2 min read
Courtesy: Lanxess
Lanxess, a leading specialty chemicals company, has developed Vibrathane 7085, a new, polyester-based prepolymer for hot cast elastomers. The core business of Lanxess is the development, manufacturing, and marketing of chemical intermediates, additives, specialty chemicals, and plastics. The company is also a leading supplier of synthetic rubber.
The new prepolymer has MDI end groups (methylene diphenyl diisocyanate) and cures with 1,4-butanediol to polyurethane cast elastomers, distinguished by a low compression set and a high tear strength at harnesses’ of 83 to 87 Shore A.
Depending on the processing conditions, Vibrathane 7085 produces cast elastomers with compression sets from 13 per cent to 42 per cent according to ASTM D395 (American Society for Testing and Materials), method B (70 °C, 22 h). Tear strength according to ASTM D1938 (Tear Strength, Trouser), for example, is between 27.2 and 85.9 kilonewton per metre.
By using the catalyst, the reaction of the prepolymer with the chain-extender speeds up. Therefore, the parts can be demoulded faster and the tools can be refilled earlier. In addition, optimised processing conditions help to shorten post curing duration. This results in lower energy consumption, which opens up cost savings and improves the sustainability of production. Pot life can be kept short at 90 seconds, but can also be extended to around 4.5 minutes, for example to achieve uniform tool filling for more complex component geometries.
Moreover, the processor can delay the post curing of the demoulded parts without degradation in tear strength, compression set, or other mechanical properties of the final elastomer product. Both the compression set and the tear strength can be separately optimised, and thus, adapted to specific demands of an application. (GK)
The new prepolymer has MDI end groups (methylene diphenyl diisocyanate) and cures with 1,4-butanediol to polyurethane cast elastomers, distinguished by a low compression set and a high tear strength at harnesses’ of 83 to 87 Shore A.
Depending on the processing conditions, Vibrathane 7085 produces cast elastomers with compression sets from 13 per cent to 42 per cent according to ASTM D395 (American Society for Testing and Materials), method B (70 °C, 22 h). Tear strength according to ASTM D1938 (Tear Strength, Trouser), for example, is between 27.2 and 85.9 kilonewton per metre.
By using the catalyst, the reaction of the prepolymer with the chain-extender speeds up. Therefore, the parts can be demoulded faster and the tools can be refilled earlier. In addition, optimised processing conditions help to shorten post curing duration. This results in lower energy consumption, which opens up cost savings and improves the sustainability of production. Pot life can be kept short at 90 seconds, but can also be extended to around 4.5 minutes, for example to achieve uniform tool filling for more complex component geometries.
Moreover, the processor can delay the post curing of the demoulded parts without degradation in tear strength, compression set, or other mechanical properties of the final elastomer product. Both the compression set and the tear strength can be separately optimised, and thus, adapted to specific demands of an application. (GK)
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