A kind of preparation method of nitrogen, phosphorus and sulfur intumescent flame retardant

Abstract

The invention discloses a preparation method of nitrogen and phosphorus sulfur expansion type flame retardant.The method includes the steps that 2,6-bis(diethanol amine)-4-sodium sulfanilate-1,3,5-triazine and diphenyl phosphoryl chloride serve as the raw materials, and the nitrogen and phosphorus sulfur flame retardant is prepared through one-step reaction.The target product is novel in structure, and the preparation process is simple, easy to control and little in byproduct; the addition amount is small, smoke restraining performance is good, and flame retardance efficiency is high; NPS three-element synergistic effect flame retardance in molecules is achieved, and by testing the heat stability and flame retardance performance of the flame retardant, it is shown that the flame retardant has the advantages of being free of toxin, capable of preventing dropping, small in addition amount and high in flame retardance efficiency; when the PC addition amount is 0.75 wt.%, the limit oxygen index of the flame retardant reaches up to 38.00%.

Description

technical field [0001] The invention belongs to the field of flame retardant material preparation, and specifically designs a preparation method of a nitrogen, phosphorus, and sulfur expansion type flame retardant. Background technique [0002] Polycarbonate (PC) is widely used in electrical and electronic, construction, packaging, medical equipment, optical instruments because of its excellent mechanical properties, high heat distortion temperature, good transparency, outstanding dimensional stability, creep resistance, etc. , transportation and other fields. Although PC itself can only reach the vertical combustion UL-94V-2 rating, and the dripping is flammable and can ignite nearby substances. However, the limiting oxygen index (LOI) of PC is about 25%, but with the increasing application range of PC, it cannot meet the requirements of its flame retardancy in some fields. Generally speaking, the way to improve the flame retardant performance of PC is to add different ty...

AI Technical Summary

Problems solved by technology

However, bromine flame retardants will produce secondary pollution, and the issue of dioxins produced during combustion has attracted widespread attention from the international community.

The decomposition products of organophosphorus compounds and their thermal cracking and combustion products of flame-retardant polymers contain few corrosive and toxic substances, and have plasticizing and thermal stabilizing effects, but their low melting point and high volatility will lead to PC The heat resistance and transparency of composite materials are reduced, which limits their application in processing

Sulfonate flame retardants have low addition amount and high efficiency, but they cannot meet the needs of some flame retardants when used alone

Although polysiloxane flame retardant has high temperature resistance, fire resistance, excellent mechanical properties and environmental friendliness, it will be expensive to add a large amount of PC, poor flame retardant efficiency and transparency when used alone.

And in order to achieve better flame retardancy and other effects, other additives, such as smoke suppressant and anti-drip agent, may change the original excellent performance of PC

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