Method for synthesizing phenoxycycloposphazene

A technology of hexaphenoxycyclotriphosphazene and hexachlorocyclotriphosphazene, which is applied in the field of phosphazene compound synthesis, can solve the problems of unfavorable industrial transformation, difficult recovery of reaction solvent, and low reaction temperature, and achieve easy control and equipment The effect of small footprint and high synthesis efficiency
CN110759947AInactive Publication Date: 2020-02-07山东省海洋化工科学研究院
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
山东省海洋化工科学研究院
Publication Date
2020-02-07
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a method for synthesizing phenoxycycloposphazene. The method comprises the following steps: dissolving hexachlorocyclotriphosphazene and a phase transfer catalyst into an organic solvent so as to obtain an organic-phase raw material; by taking a sodium phenate aqueous solution as a water-phase raw material, simultaneously feeding the organic-phase raw material and the water-phase raw material into a multi-stage centrifugal extractor with a heating function, performing a multi-stage countercurrent reaction, dissolving generated phenoxycycloposphazene into an organic solvent to form an organic-phase reaction liquid, and dissolving generated sodium chloride into water to form a water-phase reaction liquid; and distilling the organic-phase reaction liquid supporting thephenoxycycloposphazene to remove the solvent, washing hot residues obtained after the solvent is removed by using a low-molecule alcohol, and performing solid-liquid separation after washing, so as to obtain the phenoxycycloposphazene. The method is possible in continuous production, simple in process and easy to control, and the product is high in yield and purity.
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Description

technical field

[0001] The invention relates to a preparation method of a high-purity, high-yield hexaphenoxycyclotriphosphazene flame retardant, and belongs to the technical field of phosphazene compound synthesis. Background technique

[0002] Hexaphenoxycyclotriphosphazene is a cyclic phosphazene compound, which is light yellow or off-white powder or crystal. It is a halogen-free flame retardant with high thermal decomposition temperature, excellent flame retardant effect, and smoke It is widely used in industries such as engineering plastics, high-end high-voltage cables, and copper-clad laminates.

[0003] There are a lot of research reports on hexaphenoxycyclotriphosphazene at home and abroad. The current general process is to use hexachlorocyclotriphosphazene and sodium phenate to react to generate the target product. During the phenoxy substitution process, the steric hindrance effect will lead to insufficient phenoxy substitution degree and affect the yield of hexa...

Claims

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