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Method for preparing foam material by microwave hydrogel foaming

A foam material and microwave foaming technology, which is applied in the field of preparing foam materials by microwave foaming of hydrogel, achieves the effects of good versatility, low energy consumption, and low equipment requirements

Active Publication Date: 2019-09-20
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the realization of normal pressure drying of hydrogel is mainly to overcome the mesh collapse caused by the surface tension during the drying process by designing and preparing some special support structures, or to take some additional auxiliary methods to reduce the surface tension for specific gel compositions or structures. , which has certain limitations

Method used

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  • Method for preparing foam material by microwave hydrogel foaming
  • Method for preparing foam material by microwave hydrogel foaming

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Disperse 1.2g lithium diatomite in 60.0g deionized water, then add 30.0g monomeric acrylamide to the lithium diatomaceous earth dispersion respectively, after stirring for 15min, add 10.0mL 20mg / mL initiator persulfuric acid respectively under ice-water bath Potassium KPS and 300.0 μL catalyst tetramethylethylenediamine TEMED, finally, transfer the solution into a square PE box, seal it and place it in a water bath at 10°C for polymerization for 48h to obtain a nanocomposite hydrogel, and dry the hydrogel To a water content of 25wt%, microwave foaming under the condition of microwave power 100W for 2min to obtain a gel-based foam with a foam density of 0.102g / cm 3 .

Embodiment 2

[0031]Disperse 1.2g lithium diatomaceous earth in 60.0g deionized water, then add 30.0g monomer acrylamide to the lithium diatomaceous earth dispersion respectively, after stirring for 15min, add 10.0mL 20mg / mL initiator persulfuric acid respectively under ice-water bath Potassium KPS and 300.0 μL catalyst tetramethylethylenediamine TEMED, finally, the solution was transferred to a square PE box, sealed and placed in a water bath at 10°C for polymerization for 48h to obtain a nanocomposite hydrogel, and the hydrogel was dried To a water content of 35wt%, microwave foaming under the condition of microwave power 100W for 2min to obtain a gel-based foam with a foam density of 0.87g / cm 3 .

Embodiment 3

[0033] Disperse 1.2g lithium diatomaceous earth in 60.0g deionized water, then add 30.0g monomer acrylamide to the lithium diatomaceous earth dispersion respectively, after stirring for 15min, add 10.0mL 20mg / mL initiator persulfuric acid respectively under ice-water bath Potassium KPS and 300.0 μL catalyst tetramethylethylenediamine TEMED, finally, the solution was transferred to a square PE box, sealed and placed in a water bath at 10 °C for polymerization for 48 h to obtain a nanocomposite hydrogel. Dry the hydrogel to a water content of 10wt%, microwave foaming under the condition of microwave power 100W for 2min, and obtain a gel-based foam with a foam density of 0.96g / cm 3 .

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Abstract

The invention discloses a method for preparing a foam material by microwave hydrogel foaming. The method includes: heating a hydrogel with a microwave to obtain the foam material. Water content of the hydrogel is 5wt%-60wt%, and preferably 10wt%-35wt%. The hydrogel is a directly-prepared hydrogel or a hydrogel obtained by partly dewatering the directly-prepared hydrogel and has cross-linked networked macromolecules, and the macromolecules comprise one or more of natural macromolecules and derivatives thereof and synthetic macromolecules. A novel method and a novel thought are provided for preparing a porous material from the hydrogel. By means of microwave foaming, water in the hydrogel can be evaporated and expanded quickly in a heating process, and accordingly foam pores can be formed in the hydrogel to form the porous material. Further, stability and controllable moisture absorption of the foam material can be realized through adjustment of hydrophilic and hydrophobic groups in the hydrogel or surface coating.

Description

technical field [0001] The invention relates to a foam material and a preparation method thereof, in particular to a method for preparing the foam material by using hydrogel microwave foaming. Background technique [0002] As a kind of porous material, polymer foam material has a wide range of uses. It is used as a material for sound-absorbing insulation, vibration-reduction and shock-proof, thermal insulation, and impact energy absorption in the fields of aerospace, building materials, chemical machinery, and daily life. . Foam materials are generally prepared from hydrogels by freeze-drying or supercritical drying methods to remove water from the gels to form porous structures. Among them, freeze-drying is to freeze the hydrogel below the eutectic temperature, and remove the water in the hydrogel by sublimation under vacuum conditions, which has high equipment cost, long process time and difficult control conditions, high production cost, and large energy consumption. li...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08L33/26C08L33/24C08L39/06C08L35/00C08L43/04C08L29/04C08L1/28C08L71/02C08L89/00C08L5/08C08L3/04
CPCC08J9/286C08J2201/0504C08J2303/04C08J2305/08C08J2329/04C08J2333/24C08J2333/26C08J2335/00C08J2339/06C08J2343/04C08J2371/02C08J2389/00C08J2405/04
Inventor 王玉忠徐华秀徐世美王雄雷谭云王頔徐平平
Owner SICHUAN UNIV
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