Study on Surface Modification of Inorganic Composite Flame Retardant and Combustion Performance of Asphalt
Inorganic flame retardants have problems with high dosage and difficult preparation.In order to improve their flame retardancy efficiency and compatibility with asphalt materials,several representative inorganic flame retardants were selected.Based on collaborative flame retardant design and surface modification technology with silane coupling agents,the flame retardant formulation in this article was designed.The results showed that the composite flame retardant system improved the synergistic flame retardant efficiency(SE).When the ratio of Aluminium Hydroxide(AH),Magnesium Hydroxide(MH)and Zinc Borate(ZB)was 4∶1∶1,the maximum SE value was 1.34,and the Limiting oxygen index(LOI)reached 29.3;the optimal dosage of KH-550 silane coupling agent was determined to be 1.2％,with a reaction temperature of 70 ℃ and a reaction time of 45 minutes.The inorganic flame retardant powder after surface modification has good dispersibility and compatibility,and the flame retardant efficiency has been further improved.By using composite technology and surface modification with coupling agents,the performance of inorganic flame retardants has been improved,providing a new solution for the fire prevention design of asphalt pavement in highway tunnels.
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