Influence of nano-boron nitride on anti-aging property of waterborne fire-resistive coatings |
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Authors: | Ying Dong Guojian Wang Qin Su |
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Affiliation: | 1. School of Materials Science and Engineering, Tongji University, 4800 Cao’an Road, Shanghai, 201804, China 2. Key Laboratory of Advanced Civil Engineering Materials, Ministry of Education, Tongji University, Shanghai, 201804, China 3. Professional Coatings and Pigment Qualities Inspection Center of Petroleum and Chemical Industry, Shanghai, 200062, China
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Abstract: | The influence of nano-boron nitride (BN) with a multilayered structure on the anti-aging property of fire-resistive coatings was studied. After accelerated weathering for 20 days, the thermal stabilities and fire protection of the coating without nano-BN were significantly decreased, but the coating modified by nano-BN still maintained excellent intumescent effect and fire protection. The results indicated that nano-BN could improve the anti-aging property of the coatings remarkably. FTIR and XPS characterizations suggested that nano-BN with a multilayered structure could prevent the migration behavior of the hydrophilic fire-retardant additives and keep the fixed ratio of those additives in the coating. TGA results demonstrated that nano-BN could effectively enhance the thermal stabilities of the aged coatings and improve the anti-oxidation property of the char layers formed by the coatings. XRD and EDS results proved that the anti-oxidation of the aged coatings under high temperature could be enhanced effectively after adding nano-BN. SEM observations illustrated that nano-BN addition was beneficial to the improvement of the foam structure of the aged coating. |
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