Abstract
In this study, micro-encapsulated ammonium polyphosphate (MCAPP) products were prepared by using low-quality ammonium polyphosphate (APP) flame retardant products (n<100) as raw materials and melamine formaldehyde resin as coating material. This research used orthogonal test to study the effects of process parameters such as resin addition amount, curing pH value, reaction time and dispersant dosage on the results, and found the optimized combination of process conditions. A quality characterization system was established to evaluate the quality of MCAPP comprehensively. This research also carried out the dispersion recycling experiment to check the effect of dispersion recycling on MCAPP. The experimental results showed that the solubility of MCAPP decreased from raw material's 1.98 to 0.5085 after treatment, and the hot water solubility of 85°C decreased from 9.5 to 7.45. MCAPP had a significant improvement in water resistance compared with raw materials. The results of FT-IR, SEM, TG and other detection methods on MCAPP showed that the weight loss rate of MCAPP significantly reduced, the heat resistance was improved, and the comprehensive performance of the product was greatly improved. The experimental results of the dispersant recycling showed that dispersant could be recycled without affecting the quality of the MCAPP product.
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