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Polyphosphazene, and preparation method and application thereof

A technology of polyphosphazene and polydichlorophosphazene, which is applied in the field of flame retardants, can solve the problems of unsatisfactory flame retardant effect, and achieve the effect of excellent flame retardant effect, good compatibility and easy control

Active Publication Date: 2021-12-14
JINAN TAIXING FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is less research on the flame retardant of linear polyphosphazene and its derivatives, and the flame retardant effect of the existing linear polyphosphazene is not ideal

Method used

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  • Polyphosphazene, and preparation method and application thereof
  • Polyphosphazene, and preparation method and application thereof
  • Polyphosphazene, and preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0032] The preparation method of polyphosphazene provided by the invention comprises:

[0033] S1. Dissolve 2,4,6-tribromophenol in a solvent, add sodium hydroxide, heat up to 30-80°C, react for 0.5-4 hours, and obtain reactant a after the reaction is completed;

[0034] S2. Dissolving linear polydichlorophosphazene in a solvent to obtain reactant b;

[0035] S3. Slowly add reactant b to reactant a dropwise to react, the reaction temperature is 60-90°C, and the reaction time is 3-20 hours;

[0036] S4. After the reaction, the solvent is recovered, washed with water, filtered and dried to obtain polyphosphazene.

[0037] Further, the mass ratio of linear polydichlorophosphazene to 2,4,6-tribromophenol is 1:6-8.5, for example, 1:6, 1:6.8, 1:7, 1:7.5, 1: 8, 1:8.3, 1:8.5, etc.

[0038] Further, the reaction temperature in step S3 is 80-85°C, and the reaction time is 5-8 hours. For example, the reaction temperature can be 80°C, 81°C, 84°C, 85°C, etc., and the reaction time c...

Embodiment 1

[0049] A preparation method of polyphosphazene, comprising:

[0050] S1. In a reaction device equipped with a magnetic stirrer, a thermometer, and a reflux condenser, add 500 mL of tetrahydrofuran and 25.00 g (0.075 mol) of 2,4,6-tribromophenol, and fully stir to dissolve it under nitrogen protection; then add hydrogen Sodium oxide 7.00g (0.175mol), heated up to 70°C, reacted for 3h, and obtained reactant a after the reaction;

[0051] S2. Dissolve 3.00 g of linear polydichlorophosphazene in 200 mL of tetrahydrofuran under nitrogen protection conditions to obtain reactant b;

[0052] S3. Slowly add reactant b to reactant a dropwise under the condition of nitrogen protection, control the reaction temperature at 85°C, and react for 6 hours;

[0053] S4. After the reaction was completed, the solvent was recovered, washed with water, filtered, and dried to obtain 13.8 g of polyphosphazene with a yield of 75.7%.

[0054] Test has added the limiting oxygen index LOI of the polym...

Embodiment 2

[0058] A preparation method of polyphosphazene, comprising:

[0059] S1. In a reaction device equipped with a magnetic stirrer, a thermometer, and a reflux condenser, add 300 mL of tetrahydrofuran and 25.00 g (0.075 mol) of 2,4,6-tribromophenol, and fully stir to dissolve it under nitrogen protection; then add hydrogen Sodium oxide 6.00g (0.150mol), heated up to 30°C, reacted for 4h, and obtained reactant a after the reaction;

[0060] S2. Dissolve 3.30 g of linear polydichlorophosphazene in 135 mL of tetrahydrofuran under nitrogen protection conditions to obtain reactant b;

[0061] S3. Slowly add reactant b to reactant a dropwise under the condition of nitrogen protection, control the reaction temperature at 80°C, and react for 5 hours;

[0062] S4. After the reaction was completed, the solvent was recovered, washed with water, filtered and dried to obtain 14.9 g of polyphosphazene with a yield of 74.3%.

[0063] The polyphosphazene prepared in this example was mixed a...

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Abstract

The invention relates to the technical field of flame retardants, and provides a polyphosphazene and a preparation method thereof. The preparation method of the polyphosphazene comprises the following steps: by adopting 2, 4, 6-tribromophenol, sodium hydroxide and linear polydichlorophosphazene as raw materials, reacting the 2, 4, 6-tribromophenol with the sodium hydroxide to generate sodium 2, 4, 6-tribromophenol, and then reacting the sodium 2, 4, 6-tribromophenol with the linear polydichlorophosphazene to generate the polyphosphazene. The preparation method is simple in process, easy to control, low in requirement on production equipment and suitable for industrial large-scale production. The polyphosphazene prepared by the method has good compatibility with high polymer materials, has excellent flame retardance, and can be used as a flame retardant of various high polymer materials.

Description

technical field [0001] The invention relates to the technical field of flame retardants, in particular to a polyphosphazene and its preparation method and application. Background technique [0002] Polymer materials have the characteristics of light weight, good heat insulation and electrical insulation, and excellent mechanical properties. They are currently the most representative and promising category of materials, and they are increasingly used in modern life. wider. However, compared with inorganic materials and metal materials, polymer materials are easy to burn, and their oxygen index is generally lower than 21%, and a large amount of harmful gases and smoke are often produced during the combustion process. The flammability characteristics of polymer materials will bring potential security issues. [0003] Adding flame retardants is one of the effective methods to improve the flame retardancy of polymer materials. Polyphosphazene flame retardant is a new type of f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G79/025C08L63/00C08L25/06C08L23/12C08L43/02
CPCC08G79/025C08L63/00C08L25/06C08L23/12C08L2201/02C08L43/02
Inventor 徐亮刘平肖学文王鲁静索伟徐有敏段金凤刘婷
Owner JINAN TAIXING FINE CHEM
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