A kind of modified ammonium polyphosphate composite intumescent flame retardant and its preparation method and application

A technology of intumescent flame retardant and ammonium polyphosphate, which is applied in the field of modified ammonium polyphosphate composite intumescent flame retardant and its preparation, can solve the problems of complex production process, high hygroscopicity, low flame retardant efficiency, etc. The effect of flame retardant efficiency, improving hygroscopicity and increasing char formation rate

Active Publication Date: 2022-07-12
HUBEI ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above-mentioned technical problems of the existing intumescent flame retardants such as high hygroscopicity, low flame retardant efficiency, and complex production process, the present invention provides a low moisture absorption, high-efficiency flame-retardant, environmentally friendly modified ammonium polyphosphate composite intumescent flame retardant Preparation method and application thereof, the technical scheme adopted is:

Method used

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  • A kind of modified ammonium polyphosphate composite intumescent flame retardant and its preparation method and application
  • A kind of modified ammonium polyphosphate composite intumescent flame retardant and its preparation method and application

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preparation example Construction

[0029] The preparation method of the modified ammonium polyphosphate composite intumescent flame retardant described in the present application specifically includes the following steps:

[0030] Step 1. Disperse the ammonium polyphosphate powder with a degree of polymerization greater than 1000 in deionized water to obtain a dispersion A with a mass percentage concentration of 10-40 wt%, and stir the dispersion A at a constant temperature of 25-45 ° C and gradually increase it. Add the chitosan derivative aqueous solution dropwise to obtain the reaction solution A, continue to stir the reaction solution A at a constant temperature for 15-120min, then wash and filter with deionized water;

[0031] Step 2. Disperse the powder product obtained after the filtration in the step 1 in deionized water to obtain a dispersion B with a mass percentage concentration of 10-40 wt %, and stir the dispersion B at a constant temperature of 25-45 ° C and gradually increase it. Add phytic acid ...

Embodiment 1

[0037] Step 1. Take 10 g of ammonium polyphosphate powder with a degree of polymerization greater than 1000 and disperse it in 15 mL of deionized water to obtain a dispersion A with a mass percentage concentration of 40 wt%. A chitosan derivative aqueous solution with a pH value of 5.5 and a mass percentage concentration of 4 wt % prepared with a chitosan phosphate with a molecular weight of 50 kDa was 62.5 mL to obtain a reaction solution A, and in the reaction solution A, the ammonium polyphosphate powder and shell The mass ratio of the polysaccharide derivative was 4:1, and the reaction solution was continuously stirred at a constant temperature for A30min, then washed and filtered;

[0038]Step 2. Disperse the powder product obtained after the filtration in the step 1 in 15 mL of deionized water to obtain a dispersion B. Stir the dispersion B at a temperature of 25 ° C and gradually add dropwise to it with a pH value of 3.0 and a mass percent concentration. 25 mL of 8wt% p...

Embodiment 2

[0042] Step 1. Disperse 10 g of ammonium polyphosphate powder with a degree of polymerization greater than 1000 in 30 mL of deionized water to obtain a dispersion A with a mass percentage concentration of 25 wt%, stir the dispersion A at a temperature of 25 ° C, and gradually add dropwise to it 47.6 mL of an aqueous solution of chitosan derivatives with a pH value of 3.5 and a mass percentage concentration of 3 wt % prepared from chitosan polyphosphate with a molecular weight of 150 kDa to obtain a reaction solution A, and the ammonium polyphosphate powder in the reaction solution A The mass ratio to the chitosan derivative is 7:1, continue to stir the reaction solution at constant temperature for A30min, then wash and filter;

[0043] Step 2. Disperse the powder product obtained after the filtration in the step 1 in 30 mL of deionized water to obtain a dispersion B. Stir the dispersion B at a temperature of 25 ° C and gradually add dropwise to it with a pH value of 4.0 and a m...

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Abstract

The invention discloses a modified ammonium polyphosphate composite intumescent flame retardant and a preparation method and application thereof. The intumescent flame retardant takes ammonium polyphosphate as a matrix, and uses chitosan derivatives and phytic acid to electrostatically act on the ammonium polyphosphate. After coating modification, a chitosan derivative / phytic acid composite layer rich in carbon, nitrogen and phosphorus is formed on the surface of ammonium polyphosphate to form a "trinity" composite intumescent flame retardant. The modified ammonium polyphosphate composite intumescent flame retardant disclosed in the invention makes full use of carbon-rich chitosan as a carbon source and phosphorus-rich phytic acid as an acid source to modify ammonium polyphosphate, thereby improving the water resistance of ammonium polyphosphate The invention has the advantages of high flame retardant properties and intumescent flame retardant efficiency, and the preparation method is simple, environmentally friendly, and has good flame retardant performance, and can be used for the flame retardant of polyolefin.

Description

technical field [0001] The invention relates to the technical field of polymer flame retardant composite materials, in particular to a modified ammonium polyphosphate composite expansion flame retardant and a preparation method and application thereof. Background technique [0002] Intumescent flame retardant (IFR) is a new type of flame retardant mainly composed of an acid source, a gas source and a carbon source. When the polymer material is burned, the phosphoric acid generated by the thermal decomposition of the acid source acts as a dehydrating agent to dehydrate and carbonize the carbon source. At the same time, the water vapor generated by the heating reaction and the non-combustible gas generated by the gas source make the molten system expand and foam, forming an expanded carbon layer to block external heat and oxygen from entering the combustion zone, thus having a flame retardant effect. IFR has the advantages of low smoke, low toxicity, and no corrosive gas gener...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08K9/10C08K3/32C08L23/12
CPCC08K9/10C08K3/32C08K2003/323C08L2201/02C08L23/12
Inventor 颜永斌张府刘小丹侯如意田雪余轶杰覃彩芹
Owner HUBEI ENG UNIV
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