Foam made with downstream injection of water

Details Foam made with downstream injection of water Foam made with downstream injection of water

B - Operations, Transporting

29

C

B29C 44/20 (2006.01) B29C 44/08 (2006.01) C08J 9/12 (2006.01)

Patent

CA 2198133

Disclosed is a process for making a thermoplastic polymer foam structure with a blowing agent having water. The process comprises in sequence: a) melting the polymer to form a polymer melt; b) incorporating a brominated aliphatic fire retardant into the polymer melt; c) incorporating and mixing a first blowing agent into the polymer melt to form a first foamable gel; d) cooling the first foamable gel to a suitable foaming temperature; e) incorporating and mixing a second blowing agent comprising water into the cooled first foamable gel to form a second foamable gel; f) optionally further cooling the second foamable gel to a suitable foaming temperature; and g) extruding the second foamable gel through an extrusion die to form a foam structure. Incorporating of the water blowing agent downstream in the process after the foamable gel has been cooled reduces or minimizes process corrosion problems. Further disclosed is an apparatus for making the foam structure.

Procédé de fabrication de structures de polymères thermoplastiques expansés à l'aide d'un agent de soufflage aqueux. Le procédé consiste dans la suite d'opérations suivantes: a) faire fondre le polymère, b) lui incorporer un ignifuge aliphatique au brome, c) lui incorporer, et le mélanger à un premier agent de soufflage de manière à former un premier gel expansible, d) refroidir ledit gel à une température propice à l'expansion, e) incorporer et mélanger au gel refroidi un deuxième agent de soufflage aqueux, pour former un deuxième gel expansible, f) poursuivre facultativement le refroidissement du deuxième gel jusqu'à une température propice à l'expansion, g) extruder le deuxième gel expansible à travers une filière pour former une structure expansée. L'incorporation de l'agent de soufflage aqueux en aval du processus, après refroidissement du gel expansible réduit ou minimise les problèmes de corrosion en cours de processus. Est également présenté un appareil d'élaboration de structures expansées.

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