Preparation and properties of modified black phosphorus-reinforced polyurea coatings

doi:10.19936/j.cnki.2096-8000.20251228.002

Abstract

Abstract: To improve the flame retardancy of polyurea (PUA)-based composite materials, this study selected modified black phosphorus nanosheets and incorporated them into the PUA system to prepare modified black phosphorus reinforced PUA composites. Four different PUA specimens were prepared: pure PUA, BP/PUA with 1wt% black phosphorus (BP) nanosheets, CS-BP/PUA with 1wt% chitosan-modified black phosphorus (CS-BP) nanosheets, and MB-CS@BP/PUA with 1wt% chitosan and melamine borate (MB) modified black phosphorus (MB-CS@BP) nanosheets. The flame retardancy, combustion behavior, and mechanical properties of these four PUA specimens were compared using vertical combustion tests, cone calorimetry, tensile tests, and Charpy impact tests. The experimental results demonstrate that the addition of MB-CS@BP nanosheets significantly improves the flame retardancy of PUA. Compared to the BP and CS-BP nanosheets, the MB-CS@BP/PUA composite exhibits better combustion behavior and the best flame retardant performance. The incorporation of modified black phosphorus nanosheets MB-CS@BP also effectively enhances the tensile strength of PUA, with an increase of 36.7% compared to pure PUA. Under low-speed impact conditions, the MB-CS@BP/PUA composite shows a 41.40% improvement in impact strength when used as a protective coating on aluminum alloy compared to uncoated aluminum alloy.

Key words: black phosphorus, polyurea, flame retardancy, mechanical property, composites

CLC Number:

TB332

MENG Qingshi, DONG Yitong, WANG Shuo, HAN Sensen. Preparation and properties of modified black phosphorus-reinforced polyurea coatings[J]. COMPOSITES SCIENCE AND ENGINEERING, 2025, 0(12): 11-19.

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