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A kind of preparation method of highly dispersed melamine polyphosphate flame retardant

A technology of melamine polyphosphate and melamine, which is applied in the field of preparation of highly dispersible melamine polyphosphate flame retardant, can solve the problem of dispersibility of melamine polyphosphate, large amount of modifier added, and incompatibility of materials. It can achieve the effects of shortening the reaction time, improving the phenomenon of serious clots, and outstanding flame retardancy.

Active Publication Date: 2017-04-19
ZHENJIANG SANWA FLAME RETARDANT ENG TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Although the above-mentioned modification method can improve the thermal stability of melamine polyphosphate to a certain extent, and improve the flame retardancy of nylon and resin materials, the operation is cumbersome, the amount of modifier added is large, and the cost is high. Unable to solve the problems of poor dispersion and poor compatibility with materials during material processing of melamine polyphosphate

Method used

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  • A kind of preparation method of highly dispersed melamine polyphosphate flame retardant

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 2.2 kg of melamine into 20.0 kg of 85% industrial phosphoric acid under stirring, and raise the temperature to 80°C for 2 hours, and the resulting solution is ready for use. Add 23 kg of melamine and 1 kg of silicon dioxide to a 150 L high-speed mixer and mix evenly, slowly add the solution obtained in the above steps, and complete the addition within 30 minutes, continue to stir and react for 90 minutes. Rise to 300°C for 4 hours, then cool the reaction product at room temperature, pulverize and grind, and obtain 32 kg of melamine polyphosphate. excellent. Practical application shows that the obtained product has good compatibility as a flame retardant and good dispersibility in the processing of plastic products.

Embodiment 2

[0027] Add 2.8 kg of melamine to 24.1 kg of 85% industrial phosphoric acid under stirring, and raise the temperature to 80°C for 2 hours, and the resulting solution is ready for use. Add 27.6 kg of melamine and 1.6 kg of silicon dioxide to a 150 L high-speed mixer and mix evenly, slowly add the solution obtained in the above steps, and complete the addition within 30 minutes, continue to stir and react for 90 minutes. Rise to 310°C for 5 hours, then cool the reaction product at room temperature, pulverize and grind, and obtain 39.9 kg of melamine polyphosphate. excellent. Practical application shows that the obtained product has good compatibility as a flame retardant and good dispersibility in the processing of plastic products.

Embodiment 3

[0029] Add 2.1 kg of melamine into 19.2 kg of 85% industrial phosphoric acid under stirring, and raise the temperature to 80°C for 2 hours, and the resulting solution is ready for use. Add 22.2 kg of melamine and 0.6 kg of silicon dioxide to a 150 L high-speed mixer and mix evenly, slowly add the solution obtained in the above steps, and complete the addition within 30 minutes, continue to stir and react for 90 minutes. Rise to 300°C for 5 hours, then cool the reaction product at room temperature, pulverize and grind, and obtain 31.3 kg of melamine polyphosphate. excellent. Practical application shows that the obtained product has good compatibility as a flame retardant and good dispersibility in the processing of plastic products.

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Abstract

The invention discloses a preparation method of a high-dispersibility melamine pyrophosphate fire retardant. The method comprises the following steps: 1, adding a certain amount of melamine to 75%-85% of industrial phosphoric acid under agitation, heating to 60-90 DEG C and reacting for 2 hours to obtain a solution for later use; 2 mixing a certain amount of melamine with a silicon-containing dispersing agent to a high-speed mixer evenly, adding the solution obtained in the step 1, and finishing the addition within 20-60 minutes; and 3 further stirring and reacting for 50-100 minutes, heating to 260-300 DEG C, reacting for 4-7 hours, and finally cooling and crushing to obtain a melamine polyphosphate flame retardant. The preparation method disclosed by the invention is simple and hardly causes environmental pollution. Compared with a general traditional production method, a reactant is mixed relatively evenly; the reaction time is shortened; and the prepared melamine polyphosphate flame retardant is relatively small in dissolution rate in water, is good in dispersibility in the processing process of plastic and resin products, and outstanding in fire retardant property.

Description

technical field [0001] The invention relates to a preparation method of a melamine polyphosphate flame retardant, in particular to a preparation method of a highly dispersed melamine polyphosphate flame retardant. Background technique [0002] Melamine Polyphosphate (Melamine Polyphosphate), referred to as MPP, its general formula is (C 3 h 7 N 6 o 3 P) n , where n≥2, is a polymeric phosphorus-nitrogen intumescent flame retardant, and its structural formula can be expressed as: [0003] [0004] General industrial melamine polyphosphate is white crystal, the solubility in water is less than 0.01% at 20°C, the pH value of saturated aqueous solution at 20°C is about 5, the theoretical phosphorus content is 15.02%, the theoretical nitrogen content is 40.78%, and the thermal decomposition temperature of 1% is as high as 320 ~350℃, is an environmentally friendly flame retardant with no halogen, low toxicity, good thermal stability, low water solubility and excellent flame...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K5/3492
Inventor 练鸿振宋群王仲华王国华乔俊琴
Owner ZHENJIANG SANWA FLAME RETARDANT ENG TECH CO LTD
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