Preparation method of high-temperature-resistant flame-retardant polyimide modified melamine oil-absorbing foam

A polyimide, flame-retardant technology, which is applied in the field of polymer foam plastics, can solve the problems of narrow application field, high cost of foam itself, limited use of oil-absorbing materials, etc., and achieves high temperature resistance, high hydrophobicity and lipophilicity. , the effect of high flame retardancy

Pending Publication Date: 2021-08-13
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, in special occasions such as high temperature and flammability, the use of the oil-absorbing materials reported above is limited
Polyimide foam has high hydrophobic properties, and its own fire resistance, flame retardancy and temperature resistance are excellent, but the cost of the foam itself is high and the application field is narrow

Method used

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  • Preparation method of high-temperature-resistant flame-retardant polyimide modified melamine oil-absorbing foam
  • Preparation method of high-temperature-resistant flame-retardant polyimide modified melamine oil-absorbing foam
  • Preparation method of high-temperature-resistant flame-retardant polyimide modified melamine oil-absorbing foam

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Effect test

Embodiment 1

[0051] The preparation method of the high temperature resistant flame retardant polyimide modified melamine oil-absorbing foam of the present invention, the detailed steps of the preparation method are as follows:

[0052] a. Using melamine and paraformaldehyde as raw materials, according to the molar ratio of melamine and paraformaldehyde 1:2.8, add 90.00 g of melamine and 60.00 g of paraformaldehyde into a three-necked flask equipped with mechanical stirring, condenser and thermometer for mixing, After mixing, add 51.50 g of deionized water as a solvent until the solid content of the mixed system is 74.44%, and add an aqueous sodium hydroxide solution with a concentration of 20% by mass to adjust the pH value of the mixed system to 9.5; then use an oil bath to heat up and react , control the reaction temperature to be 80-85°C, after the reaction system is clarified, continue to insulate and react at 80-85°C until the cloud point, and the reaction is completed; after the react...

Embodiment 2

[0059] The preparation method of the high temperature resistant flame retardant polyimide modified melamine oil-absorbing foam of the present invention, the detailed steps of the preparation method are as follows:

[0060] a. Using melamine and paraformaldehyde as raw materials, according to the molar ratio of melamine and paraformaldehyde of 1:2.5, 90.00 g of melamine and 53.57 g of paraformaldehyde were added into a three-necked flask equipped with mechanical stirring, condenser and thermometer for mixing, After mixing, add 61.50 g of deionized water as a solvent until the solid content of the mixed system is 70.0%, and add an aqueous sodium hydroxide solution with a concentration of 15% by mass to adjust the pH value of the mixed system to 9.3; then use an oil bath to heat up and react , control the reaction temperature to be 80-85°C, after the reaction system is clarified, continue to insulate and react at 80-85°C until the cloud point, and the reaction is completed; after ...

Embodiment 3

[0067] The preparation method of the high temperature resistant flame retardant polyimide modified melamine oil-absorbing foam of the present invention, the detailed steps of the preparation method are as follows:

[0068] a. Using melamine and paraformaldehyde as raw materials, according to the molar ratio of melamine and paraformaldehyde of 1:2.3, melamine 90.00g and paraformaldehyde 49.24g were added into a three-necked flask equipped with mechanical stirring, condenser and thermometer for mixing, After mixing, add 74.98 g of deionized water as a solvent until the solid content of the mixed system is 65.00%, and add an aqueous solution of sodium hydroxide with a concentration of 10% by mass to adjust the pH of the mixed system to 9.0; then use an oil bath to heat up and react , control the reaction temperature to be 80-85°C, after the reaction system is clarified, continue to insulate and react at 80-85°C until the cloud point, and the reaction is completed; after the reacti...

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Abstract

The invention discloses a preparation method of high-temperature-resistant flame-retardant polyimide modified melamine oil-absorbing foam. The preparation method comprises the following steps: firstly, mixing melamine and paraformaldehyde, then adding deionized water and a sodium hydroxide solution to adjust a mixed system, then conducting heating to react, and conducting cooling to room temperature after the reaction to obtain a melamine resin prepolymer; adding an emulsifier, a curing agent and a foaming agent into the obtained prepolymer for emulsification, and performing microwave foaming to obtain melamine foam; reacting a dianhydride substance with methanol or ethanol to obtain an ester product, and adding a diamine substance into the obtained ester product to react to obtain a polyester ammonium salt solution; and diluting the obtained polyester ammonium salt solution, adding the obtained melamine foam for impregnation after dilution, removing the solvent after impregnation, and finally performing high-temperature imidization reaction to obtain the melamine-polyimide composite oil-absorbing foam. The preparation process disclosed by the invention is simple to operate, and the prepared polyimide modified melamine oil absorption foam is excellent in performance and has relatively high hydrophobicity, lipophilicity, thermal stability and flame retardant property.

Description

[0001] 1. Technical field: [0002] The invention belongs to the technical field of polymer foam preparation, and in particular relates to a preparation method of a high-temperature-resistant flame-retardant polyimide-modified melamine oil-absorbing foam. [0003] 2. Background technology: [0004] At present, the use of three-dimensional porous foam materials in the treatment of oil spills and organic pollution has gradually emerged, but the development of composite materials with high oil absorption rate, high repetition rate, and low cost is relatively backward, especially oil-absorbing materials that can be used in high-temperature and flammable occasions are rare. reports. [0005] Invention patent application CN104987591A has prepared a composite material with good flame retardant performance by combining polypropylene with polymer absorbent. This material also has good oil absorption performance and can be used as an oil absorption material to play a huge role in oil pol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/40C08L61/28C08L79/08C09K3/32
CPCC08J9/405C09K3/32C08J2361/28C08J2479/08
Inventor 石晓华温亚洲千林凤任庆辉
Owner ZHENGZHOU UNIV
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