Abstract: Disclosed are chemically end-capped polypiperazine pyrophosphate-modified ammonium polyphosphate with high temperature resistance and precipitation resistance, a preparation method therefor, and an apparatus and application thereof. The chemically end-capped polypiperazine pyrophosphate-modified ammonium polyphosphate flame retardant is formed by polypiperazine pyrophosphate modification based on ammonium polyphosphate, followed by end capping; and the polypiperazine pyrophosphate is prepared by polymerization of an intermediate piperazine diphosphate obtained through dehydration condensation of phosphoric acid and piperazine. The chemically end-capped polypiperazine pyrophosphate-modified ammonium polyphosphate flame retardant of the present solution is prepared by using special equipment, which ensures whiteness and thermal stability of product, and improves properties of ammonium polyphosphate.

Abstract: Disclosed are chemically end-capped melamine pyrophosphate with high temperature resistance and precipitation resistance, a preparation method and apparatus thereof, and an application thereof in flame-retardant nylon. End-capping treatment of melamine pyrophosphate enhances flame retardancy and precipitation resistance of a flame retardant, and melamine pyrophosphate is used for producing high-strength flame-retardant nylon, which improves product performance. A special flame-retardant preparation device is also used, and appropriate process flow and parameter design further improves comprehensive properties of the flame retardant, including whiteness and a 1% thermal decomposition temperature. The present technical solution can overcome technical defects of the melamine pyrophosphate flame retardant in the prior art including non-ideal properties in a flame retardant effect and stability, as well as difficulty to improve the comprehensive properties of the flame-retardant nylon.