Investigation of Fire Resistant Polyurea Systems


  1. DiLoreto, B.
  2. DiLoreto, S.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);Elastochem Specialty Chemicals Inc, Brantford ON (CAN)
DRDC Atlantic is interested in evaluating polyurea coatings for use in enclosed spaces as damage control materials. For such applications, their fire resistant properties need to be improved. The work reported here is divided into two parts. In Part 1, three base polyurea formulations were developed and evaluated by cone calorimetry. The goal was to replace portions of the organic polyurea backbone to improve the flame retardancy. The first sample utilized an diisocyanate prepolymer with a portion of its backbone made up of a phosphorous polyol, the second sample replaced a portion of the polyether amine with an amine terminated polydimethylsiloxane and the third sample combined the phosphorous polyol with the amine terminated polydimethylsiloxane. Cone calorimetry determined that the third sample yielded the best results for lowering smoke production and increasing time to ignition. It is believed that the phosphorous polyol and polydimethylsiloxane have a synergistic effect in improving the flame properties. In Part 2 of this work, the phosphorous polyol/ polydimethylsiloxane based polyurea was used as the base formulation and various combinations of flame retardant additives were incorporated in an attempt to further improve the flame properties. Cone calorimetry indicated that the best combinations included sodium phosphate, ammonium polyphosphate (APP)/triisocyanurate 3:1, treated graphite, urea, zeolite and melamine.

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Report Number
DRDC-ATLANTIC-CR-2009-071 — Contractor Report (Final Report)
Date of publication
01 Oct 2009
Number of Pages
Electronic Document(PDF)

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