Preparation of the Fire-retardant Air Filter Paper for Internal Combustion Engine

In order to improve the flame-retardant properties of air filter paper for internal combustion engine,the effect of mass ratios of bromine and antimony in bromide-antimonite synergistic flame retardant system on fire-retardant performance of air filter paper was studied.The results showed that the optimal mass ratio of the two was 3∶1.On this condition,the effect of the dosage of flame retarder on flame-retardant property,mechanical properties and permeability was further investigated.The results showed that the flame-retardant property satisfied the requirement of the standard GB/T14656—1993 when the retention rate of flame retarder was 25%.Meanwhile the paper stiffness increased by 20%,and bursting strength and permeability were reduced by 11% and 10% respectively.