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A kind of intumescent flame retardant and preparation method thereof

An intumescent flame retardant and aliphatic chain technology, which is applied in the field of flame retardants, can solve the problems of application limitation, large addition amount, poor material compatibility, etc., and achieves simple post-processing process, simple production conditions, and improved flame retardant performance. Effect

Inactive Publication Date: 2017-10-24
NANYANG INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Traditional small-molecule flame retardants are widely used due to their convenient processing. However, small-molecule flame retardants have the disadvantages of low flame retardant efficiency, large addition amount, poor compatibility with materials, and affecting the mechanical and electrical properties of materials. Its application is limited

Method used

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  • A kind of intumescent flame retardant and preparation method thereof
  • A kind of intumescent flame retardant and preparation method thereof
  • A kind of intumescent flame retardant and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Piperazine (8.614g, 0.1mol), sodium dihydrogen phosphite (8.798 mol) were added to the 500ml four-necked flask equipped with a thermometer, nitrogen introduction, a 100ml constant pressure dropping funnel, a magnetron, a reflux condenser and a tail gas absorption device. g, 0.1mol) and 200ml of concentrated hydrochloric acid, under nitrogen protection and magnetic stirring, 50ml of concentrated hydrochloric acid dissolved in paraformaldehyde (9.009g, 0.3mol) was added to the constant pressure funnel, and slowly added dropwise to the four-necked flask , after the dropwise addition was completed, the temperature was raised to 70 °C and the reaction was continued for 12 hours;

[0028] After the reaction, dimethylamine (0.4508 g, 0.01 mol) and paraformaldehyde (0.601 g, 0.02 mol) were dissolved in 50 ml of concentrated hydrochloric acid and added to a constant pressure funnel. Under nitrogen protection and magnetic stirring, slowly dropwise into a four-necked flask, contin...

Embodiment 2

[0031] Add homopiperazine (10.218g, 0.1mol), sodium dihydrogen phosphite ( 8.798g, 0.1mol) and 200ml of concentrated hydrochloric acid, under nitrogen protection and magnetic stirring, 50ml of concentrated hydrochloric acid dissolved in paraformaldehyde (6.006g, 0.2mol) was added to the constant pressure funnel, and slowly added dropwise to four In the flask, after the dropwise addition, the temperature was raised to 150°C and the reaction was continued for 2 hours;

[0032] After the reaction, take dimethylamine (0.4508g, 0.01mol) and paraformaldehyde (0.601g, 0.02mol) and dissolve them in 50ml of concentrated hydrochloric acid, add them to the constant pressure funnel, and slowly drip under nitrogen protection and magnetic stirring. Add it to the four-necked flask, continue to react at 150 ° C for 5 hours, continue to pass N 2 Cooled to room temperature, then evaporated the solvent in the reaction flask, washed with 100 ml of ethanol after cooling to obtain a white solid, a...

Embodiment 3

[0035] Add methylamine (3.106g, 0.1mol), sodium dihydrogen phosphite (8.798g to the 500ml four-necked flask equipped with thermometer, nitrogen introduction, 100ml constant pressure dropping funnel, magnetron and reflux condenser and tail gas absorption device) g, 0.1mol) and 200ml of concentrated hydrochloric acid, under nitrogen protection and magnetic stirring, 50ml of concentrated hydrochloric acid dissolved in paraformaldehyde (12.012g, 0.4mol) was added to the constant pressure funnel, and slowly added dropwise to the four-necked flask , after the dropwise addition was completed, the temperature was raised to 100 ° C and the reaction was continued for 12 hours;

[0036] After the reaction, dimethylamine (0.4508 g, 0.01 mol) and paraformaldehyde (0.601 g, 0.02 mol) were dissolved in 50 ml of concentrated hydrochloric acid and added to a constant pressure funnel. Under nitrogen protection and magnetic stirring, slowly dropwise into a four-necked flask, continue to react at...

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Abstract

The invention provides an intumescent flame retardant and a preparation method thereof. The method comprises: 1) dissolving sodium dihydrogen hypophosphite and organic amine A in concentrated hydrochloric acid respectively, introducing inert gas and magnetic stirring, and dissolving polymer The formaldehyde solution is slowly added dropwise to the above solution. After the dropwise addition, after the reaction at a certain temperature and time, the reaction product B is obtained; (2), the concentrated hydrochloric acid that dissolves the organic amine C and paraformaldehyde is added dropwise to the reaction system solution, capping the reaction product B, after the dropwise addition, continue to react for 2-12 hours to obtain the capped reaction product D, cooling, extracting with an organic solvent, filtering, washing, and drying to obtain a white powdery polymer; (3) Dissolve the white powdery polymer obtained in (2) in an aqueous solution containing melamine to neutralize it, and after neutralizing and heating up for 2-5 hours, filter it with suction, wash it, and dry it to obtain an intumescent resistor. Fuel. The invention has simple process and high yield.

Description

technical field [0001] The invention relates to the technical field of flame retardants, in particular to an intumescent flame retardant and a preparation method thereof. Background technique [0002] With the vigorous development of polymer materials, it has brought many conveniences to people's lives. While enjoying the convenience brought by polymer technology, people also suffer great disasters caused by the flammability of polymer materials. Therefore, improving the flame retardant technology level of polymer materials is one of the focuses of current research in the scientific and technological circles. Introducing flame retardants into polymer materials can reduce the fire hazard of the materials. Traditional small-molecule flame retardants are widely used due to their convenient processing, but small-molecule flame retardants have the disadvantages of low flame retardant efficiency, large addition amount, poor compatibility with materials, and affecting the mechanic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G79/04C08L85/02
Inventor 史政海杜朝军张群安谢英男杨艳菊
Owner NANYANG INST OF TECH