| Intumescence flame retardant (IFR) was prepared by using ammonium polyphosphate (APP) as acid source, pentaerythritol (PER) as carbon source and melamine cyanurate (MCA) as gas source. The IFR was applied on polyester fibers (PET) through melt-blending and give full play into anti-dripping. The influence factors on the preparation of the flame retardant, such as the mass ratio of components and the IFR addition on polyester fibers were investigated. The experimental results showed that the optimal mass ratio of three materials was m (ammonium polyphosphate):m (pentaerythritol):m (melamine cyanurate)= 2:1:1. The optimal IFR addition was 20% while there was almost no dripping. The prepared flame retardant was characterized by TG and DSC. The anti-dripping property of polyester fibers was also investigated.The IFR was ultra fining by ball mill. Single factor analysis method was presented to analysis on the influence of parameters on the process and result of ultrafine grinding when sodium hexametaphosphate was applied as dispersant. The results showed that volume average particle diameter was 4.887μm which decreased by 52.7% compared with original particle after ultra fining 480min when the mass ratio of IFR to grinding medium 1:7 and rotation speed is 300r/min.Pre-and post ultrafine IFR and polyester fibers were compared to analysis on the thermal properties, structure of char layer and dripping property. The results showed that structure of char layer of ultra fined IFR was denser, char yield was higher when the addition of pre-and post IFR were the same as 20% and the ability of anti-dripping was improved. |
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