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Furukawa Review No.45

Development of the New Halogen-Free Flame Retardant System by Nanoencapsulation

Jae-Kyung Kim, Hirofumi Kawanaka

Abstract

A large amount of flame retardant is required for high flame retardance of polymer materials, but their physical properties are remarkably lowered. Meanwhile, a demand for the halogen-free flame retardant that does not allow the generation of toxic gases during combustion has been strongly required. But, so far, the halogen-free flame retardant having a performance as high as the halogen flame retardant is not available. Here we propose the nanoencapsulation technology of the halogen-free flame retardant as one promising method to achieve a high flame retardant effect with a small amount of a conventional flame retardant. We succeeded to nanoencapsulate the halogen-free flame retardant in a layered compound by using a co-milling method as a nanoencapsulation technology. We found out that the nanocapsules are co-mixed, with the exfoliated state and the intercalated state in the resin. The results show that the prepared nanocapsule has a good flame retardant effect in spite of a small amount of the flame retardant in the nanocapsule. Also, the synergy effect for the highly flame retardance has been investigated by combining the commercially available flame retardant with the nanocapsule. Then, the cross-linked foam which is highly combustible was applied to confirm the synergy effect, and the material was classified as UL94 V-0.

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