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Preparation method and application of phosphorus-doped carbon nitride two-dimensional nanoparticles for preparing flame-retardant waterborne polyurethane

A water-based polyurethane and two-dimensional nanotechnology, applied in the field of nanomaterials, can solve the problems of increasing the amount of carbon residue, and achieve the effects of increasing the amount of carbon residue, promoting retention, and high phosphorus content

Pending Publication Date: 2021-02-12
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in terms of modifying the traditional heptazinyl flame retardant to further improve the flame retardant performance, there is a problem that the heptazinyl flame retardant does not significantly increase the amount of carbon residue in the condensed phase flame retardant

Method used

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  • Preparation method and application of phosphorus-doped carbon nitride two-dimensional nanoparticles for preparing flame-retardant waterborne polyurethane
  • Preparation method and application of phosphorus-doped carbon nitride two-dimensional nanoparticles for preparing flame-retardant waterborne polyurethane
  • Preparation method and application of phosphorus-doped carbon nitride two-dimensional nanoparticles for preparing flame-retardant waterborne polyurethane

Examples

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Effect test

Embodiment 1

[0037] An embodiment of the preparation method of phosphorus-doped carbon nitride two-dimensional nanoparticles of the present invention, the method comprises the following steps:

[0038] (1) Stir thiourea and 2-aminoethylphosphonic acid at a frequency of 50 Hz for 3 minutes and mix evenly to obtain a mixed precursor; the mass ratio of thiourea to 2-aminoethylphosphonic acid is 1:0.2;

[0039] (2) Put the mixed precursor obtained in step (1) into a ceramic crucible and seal it, heat it to 400°C in a muffle furnace at a rate of 15°C / min and keep it warm for 3h, and after natural cooling, a block doped carbon;

[0040] (3) After pulverizing the massive doped carbon obtained in step (2) at a frequency of 50 Hz for 50 seconds in a high-speed pulverizer, the phosphorus-doped carbon nitride two-dimensional nanoparticles are obtained.

[0041] The phosphorus-doped carbon nitride two-dimensional nanoparticles are used to prepare flame-retardant water-based polyurethane, comprising t...

Embodiment 2

[0047] An embodiment of the preparation method of phosphorus-doped carbon nitride two-dimensional nanoparticles of the present invention, the method comprises the following steps:

[0048] (1) Stir melamine and sodium hypophosphite at a frequency of 50 Hz for 50 s and mix evenly to obtain a mixed precursor; the mass ratio of melamine and sodium hypophosphite is 1:0.09;

[0049] (2) Put the mixed precursor obtained in step (1) into a ceramic crucible and seal it, heat it to 600°C in a muffle furnace at a rate of 20°C / min and keep it warm for 2h, and after natural cooling, a block doped carbon;

[0050] (3) After pulverizing the massive doped carbon obtained in step (2) in a high-speed pulverizer at a frequency of 50 Hz for 1 min, the phosphorus-doped carbon nitride two-dimensional nanoparticles are obtained.

[0051] The preparation method of flame-retardant water-based polyurethane described in this embodiment is the same as that in Example 1.

Embodiment 3

[0053] An embodiment of the preparation method of phosphorus-doped carbon nitride two-dimensional nanoparticles of the present invention, the method comprises the following steps:

[0054] (1) Stir urea and phytic acid at a frequency of 50 Hz for 50 s and mix evenly to obtain a mixed precursor; the mass ratio of urea to phytic acid is 1:0.05;

[0055] (2) Put the mixed precursor obtained in step (1) into a ceramic crucible and seal it, heat it in a muffle furnace to 500°C at a rate of 10°C / min and keep it warm for 2h, and after natural cooling, a block doped carbon;

[0056] (3) After pulverizing the massive doped carbon obtained in step (2) at a frequency of 50 Hz in a high-speed pulverizer for 2 minutes, the phosphorus-doped carbon nitride two-dimensional nanoparticles are obtained.

[0057] The preparation method of flame-retardant water-based polyurethane described in this embodiment is the same as that in Example 1.

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Abstract

The invention provides a preparation method of phosphorus-doped carbon nitride two-dimensional nanoparticles for preparing flame-retardant waterborne polyurethane, and belongs to the field of nano materials. According to the method, a nitrogen-rich compound and a phosphorus-containing compound are uniformly mixed, and the phosphorus-doped carbon nitride halogen-free flame-retardant two-dimensionalnanoparticles are obtained by a one-step calcination method. According to the method, phosphorus atoms are successfully doped into a heptazine structure, the prepared flame-retardant material is promoted to form a cross-linked network in the combustion process, and retention of phosphorus in a condensed phase is enhanced. The invention also provides the phosphorus-doped carbon nitride halogen-free flame-retardant two-dimensional nanoparticles prepared by the method, the overall thermal stability of the material is high, and the carbon residue rate of the material can be fully improved when the material is used as a flame-retardant material additive. The invention further provides flame-retardant waterborne polyurethane prepared from the material and a preparation method of the flame-retardant waterborne polyurethane, and according to the method, a proper amount of phosphorus-doped carbon nitride two-dimensional nanoparticles are doped through in-situ emulsification, so that the finally prepared material is high in phosphorus content and stable in material property.

Description

technical field [0001] The invention belongs to the field of nanomaterials, and in particular relates to a preparation method and application of phosphorus-doped carbon nitride two-dimensional nanoparticles used for preparing flame-retardant water-based polyurethane. Background technique [0002] Waterborne polyurethane is widely used in production and life because of its excellent performance and mature technology. However, due to the flammability of polymer materials, it is easy to catch fire and even produce toxic gases during combustion, which has a great potential fire risk. Such safety hazards make the development of waterborne polyurethane composite materials with fire and flame retardant become very important. At present, additive flame retardants are simple to prepare, easy to expand industrial production, and widely used in the field of flame-retardant polymer composite materials. [0003] Triazine-based flame retardants are one of the most important varieties of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B21/097B82Y40/00C08G18/75C08G18/66C08G18/48C08G18/44C08G18/12C08G18/34C08G18/32C08L75/04C08K3/28C08J3/03
CPCC01B21/0605C01B21/097B82Y40/00C08G18/755C08G18/6625C08G18/6611C08G18/6607C08G18/4018C08G18/44C08G18/4808C08G18/4854C08G18/12C08J3/03C08K2201/011C08J2375/04C08K3/38C01P2006/32C08G18/348C08G18/3206
Inventor 鲁少林洪炜陈旭东
Owner SUN YAT SEN UNIV
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