Modified ammonium polyphosphate composite intumescent flame retardant and preparation method and application thereof

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, low flame retardant efficiency and high hygroscopicity, and achieve rich source of raw materials , Improve the flame retardant efficiency, improve the effect of hygroscopicity

Active Publication Date: 2020-12-01
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:

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  • Modified ammonium polyphosphate composite intumescent flame retardant and preparation method and application thereof
  • Modified ammonium polyphosphate composite intumescent flame retardant and preparation method and application thereof

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[0029] The preparation method of the modified ammonium polyphosphate composite expansion flame retardant described in the application specifically comprises 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 percent concentration of 10-40 wt%, stir the dispersion A at a constant temperature at a temperature of 25-45°C and gradually add Add the chitosan derivative aqueous solution dropwise to obtain the reaction solution A, continue to stir the reaction solution A at constant temperature for 15-120min, then wash and filter with deionized water;

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

Embodiment 1

[0037] Step 1. Disperse 10 g of ammonium polyphosphate powder with a degree of polymerization greater than 1000 in 15 mL of deionized water to obtain a dispersion A with a mass percent concentration of 40 wt %. Stir the dispersion A at a temperature of 25° C. and gradually add the Molecular weight is 50kDa chitosan phosphate preparation pH value is 5.5, mass percent concentration is 62.5mL of chitosan derivative aqueous solution of 4wt%, obtains reaction solution A, and in described reaction solution A, ammonium polyphosphate powder and shell The mass ratio of polysaccharide derivatives is 4:1, continue to stir the reaction solution A30min at constant temperature, then wash and filter;

[0038]Step 2. Disperse the powder product obtained after filtering in step 1 in 15 mL of deionized water to obtain dispersion B. Stir dispersion B at a temperature of 25° C. and gradually add a pH value of 3.0 and a mass percentage concentration of 25mL of 8wt% phytic acid aqueous solution to ...

Embodiment 2

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

[0043] Step 2. Disperse the powder product obtained after filtering in step 1 in 30 mL of deionized water to obtain dispersion B. Stir dispersion B at a temperature of 25° C. and gradually add a pH value of 4.0 and a mass percentage concentration of 6wt% phyti...

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Abstract

The invention discloses a modified ammonium polyphosphate composite intumescent flame retardant and a preparation method and application thereof. According to the intumescent flame retardant, ammoniumpolyphosphate serves as a matrix, chitosan derivatives and phytic acid are used for coating and modifying the ammonium polyphosphate through electrostatic interaction, a chitosan derivative/phytic acid composite layer rich in carbon, nitrogen and phosphorus is formed on the surface of the ammonium polyphosphate, and the three-in-one composite intumescent flame retardant is formed. The modified ammonium polyphosphate composite intumescent flame retardant disclosed by the invention fully utilizes carbon-rich chitosan as a carbon source and phosphorus-rich phytic acid as an acid source to modifyammonium polyphosphate, so that the water resistance and the intumescent flame retardant efficiency of ammonium polyphosphate are improved, and the modified ammonium polyphosphate composite intumescent flame retardant is simple in preparation method, environment-friendly and good in flame retardant property, and can be used for flame retardance 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 its preparation method and application. Background technique [0002] Intumescent flame retardant (IFR) is a new type of flame retardant mainly composed of acid source, gas source and carbon source. When the polymer material is burned, the phosphoric acid generated by the thermal decomposition of the acid source is used as a dehydrating agent to dehydrate and carbonize the carbon source. ; At the same time, the water vapor produced by the heating reaction and the non-combustible gas produced 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 generation. It ...

Claims

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Application Information

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Patent Type & Authority Applications(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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