Preparation method for metal organic framework structure wrapped ammonium polyphosphate fire retardant and application

A metal-organic framework and ammonium polyphosphate technology, which is applied in the field of material preparation, can solve the problems of reducing the flame retardancy of materials, migration and exudation, and easy moisture absorption, so as to improve compatibility and dispersion, reduce polarity and affinity Water-based, simple process steps

Active Publication Date: 2019-02-12
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ammonium Polyphosphate (Ammonium Polyphosphate hereinafter referred to as APP), as a typical additive flame retardant, has the advantages of high phosphorus and nitrogen content, good thermal stability and flame retardancy, and is non-toxic and smoke-free; but ammonium polyphosphate exists The problems of easy moisture absorption, migration and exudation, and poor compatibility with organic polymers are limited in practical applications
[0003] In related technologies, ammonium polyphosphate modified by coupling agent or ammonium polyphosphate modified by microencapsulation is used

Method used

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  • Preparation method for metal organic framework structure wrapped ammonium polyphosphate fire retardant and application
  • Preparation method for metal organic framework structure wrapped ammonium polyphosphate fire retardant and application
  • Preparation method for metal organic framework structure wrapped ammonium polyphosphate fire retardant and application

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Embodiment 1

[0028] The embodiment of the present invention provides a method for preparing a metal-organic framework-wrapped ammonium polyphosphate flame retardant. Ammonium polyphosphate is dispersed in methanol, a methanol solution containing dimethylimidazole is added thereto, and the mixture containing The methanol solution of metal nitrate is stirred evenly and then heated to reflux for reaction. After the reaction is completed, it is centrifuged, washed, and dried to obtain an ammonium polyphosphate flame retardant wrapped by a metal-organic framework structure.

[0029] Metal-organic frameworks (MOF) is a new type of organic-inorganic hybrid porous crystal structure formed by self-assembly of metal ions / metal clusters and organic link units through coordination forces; it has high porosity, low density , ultra-high specific surface area, pore rules, adjustable pore size, topological structure diversity and tailorability, etc.; the use of metal-organic frameworks to wrap ammonium pol...

Embodiment 2

[0042] According to the method of Example 1 of the present invention, the ammonium polyphosphate flame retardant wrapped by the metal organic framework structure was prepared, 1.0g APP was added into 25mL methanol solution, ultrasonically dispersed for 20min, and 2.46g methylimidazole was dissolved in 25mL methanol solution Add dropwise into the dispersed APP solution, stir for 20min, dissolve 1.485g of zinc nitrate hexahydrate in 50mL of methanol, add dropwise into the above solution, stir for 20min, put it in an oil bath at 60°C for 4h, centrifuge and wash for 60 °C drying to obtain APP@Zn-MOF flame retardant. All the other are the same as embodiment one.

[0043] A metal-organic framework structure Zn-MOF is prepared according to the method of the embodiment of the present invention.

[0044] Refer to attached figure 2 , the XRD diffraction peaks of APP and the synthesized Zn-MOF structure are consistent with the standard card, while the APP samples wrapped with Zn-MOF h...

Embodiment 3

[0047]According to the method of Example 1 of the present invention, the ammonium polyphosphate flame retardant wrapped by the metal-organic framework structure was prepared, 1.0g APP was added to 25mL methanol solution, and ultrasonically dispersed for 20min to obtain a uniformly dispersed APP solution; 2.46g methylimidazole was taken Dissolve in 25mL of methanol solution and add dropwise to the APP solution, stir for 20min; take 1.485g of cobalt nitrate hexahydrate and dissolve in 50mL of methanol, add dropwise to the above solution, stir for 20min, put in an oil bath at 60°C Reacted for 4 hours, washed by centrifugation, and dried at 60°C to obtain APP@Co-MOF flame retardant. All the other are the same as embodiment one.

[0048] Co-MOF with metal organic framework structure was prepared according to the method of the embodiment of the present invention.

[0049] Refer to attached image 3 , 5 , the surface of unwrapped APP is smooth, but after wrapped with Co-MOF, the s...

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Abstract

The invention discloses a preparation method for a metal organic framework structure wrapped ammonium polyphosphate fire retardant and application. The preparation method comprises the following steps: dispersing ammonium polyphosphate in a methanol solution, adding the methanol solution containing dimethylimidazole in the mixed solution, uniformly stirring and mixing, dropwise adding the methanolsolution containing metal nitrate, uniformly stirring, performing a heating reflux reaction, centrifuging, washing and drying after completing the reaction, thereby obtaining the fire retardant. Thepreparation method has the advantages of simple processing step, high operability and low preparation cost; the active site of ammonium polyphosphate is sealed by adopting a metal organic framework structure to form an organic isolation layer with certain thickness to block the invasion of water, so that the polarity and the hydrophily of the material can be effectively reduced, the compatibilityand the dispersibility of the material and an organic high-molecular polymer are improved, and meanwhile, the catalytic charing effect is achieved, and the flame retardant efficiency of ammonium polyphosphate is improved; and the preparation method can be widely applied to fields of flame retardant materials such as epoxy resin, polyurethane, polystyrene, polylactic acid or polyolefin.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and in particular relates to a preparation method and an application of a metal-organic framework structure-wrapped ammonium polyphosphate flame retardant. Background technique [0002] Polymer materials are widely used, and ordinary polymer materials are flammable. Improving the thermal stability of materials and enhancing the flame retardancy of materials have become the current research hotspots of material modification. Ammonium Polyphosphate (Ammonium Polyphosphate hereinafter referred to as APP), as a typical additive flame retardant, has the advantages of high phosphorus and nitrogen content, good thermal stability and flame retardancy, and is non-toxic and smoke-free; however, ammonium polyphosphate exists The problems of easy moisture absorption, migration and exudation, and poor compatibility with organic polymers are limited in practical applications. [0003] In related...

Claims

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Application Information

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IPC IPC(8): C08L63/00C08K9/10C08K3/32
Inventor 周克清高瑞周倩倩
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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