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Polyacrylamide aerogel, preparation method and application thereof

A technology of polyacrylamide and acrylamide, which is applied in the field of functional materials and fluid control, can solve the problems of difficult to transport water application, limited rising height, slow liquid transport speed, etc., and achieve the effect of easy large-scale preparation and easy preparation

Active Publication Date: 2019-08-09
ZHEJIANG SCI-TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, many of these examples of spontaneous and directional transport of liquids in nature are achieved by their delicate microscopic shapes, which are usually only used for directional transport of tiny liquids, and are limited by processing and preparation techniques and costs, making it difficult to Realize the macro transport water application
[0004] Most of the current energy-free liquid transportation systems are based on a small number of material systems, such as sponges, filter papers, etc. The liquid transportation speed is slow and the rising height is limited; water pumps, which are widely used in production and life, have the advantages of high efficiency and large transportation volume. , but requires additional energy consumption

Method used

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  • Polyacrylamide aerogel, preparation method and application thereof
  • Polyacrylamide aerogel, preparation method and application thereof
  • Polyacrylamide aerogel, preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0044] A preparation method of polyacrylamide airgel with radial hierarchical porous structure under the condition of -90°C

[0045] Step (1), adding raw materials into the dispersion medium, stirring evenly under the condition of avoiding light until the preparation raw materials are completely dissolved, and obtaining a transparent acrylamide precursor solution; wherein, the dispersion medium is water, and the raw materials include polymerization monomers , a chemical crosslinking agent and a photoinitiator, the polymerization reaction monomer is acrylamide, the chemical crosslinking agent is methylenebisacrylamide, and the photoinitiator is azobisisobutylamidine hydrochloride, specifically Specifically, prepare acrylamide solution (AAm / H2O) with a concentration of 100 mg / ml, methylenebisacrylamide (MBAA) with a concentration of 9.72 mg / ml, and azobisisobutylamidine hydrochloride with a concentration of 12.5 mg / ml Add salt (V-50) into the water solvent, and stir for 1 hour u...

Embodiment 2

[0050] A preparation method of polyacrylamide airgel with radial porous structure under the condition of -60°C

[0051] Step (1), adding preparation raw materials into the dispersion medium, stirring evenly under the condition of avoiding light until the preparation raw materials are completely dissolved, and obtaining a transparent acrylamide precursor solution; wherein, the dispersion medium is water, and the raw materials include polymerization reaction unit body, chemical cross-linking agent and photoinitiator, the polymerization reaction monomer is acrylamide, the chemical cross-linking agent is methylenebisacrylamide, and the photoinitiator is azobisisobutylamidine hydrochloride, Specifically, the acrylamide solution (AAm / H2O) with a concentration of 100 mg / ml, the methylenebisacrylamide (MBAA) with a concentration of 9.72 mg / ml, and the azobisisobutylamidine salt with a concentration of 12.5 mg / ml were prepared. salt (V-50) was added to the water solvent, and stirred fo...

Embodiment 3

[0056] A preparation method of polyacrylamide airgel with radial porous structure under the condition of -30°C

[0057] Step (1), adding preparation raw materials into the dispersion medium, stirring evenly under the condition of avoiding light until the preparation raw materials are completely dissolved, and obtaining a transparent acrylamide precursor solution; wherein, the dispersion medium is water, and the raw materials include polymerization reaction unit body, chemical cross-linking agent and photoinitiator, the polymerization reaction monomer is acrylamide, the chemical cross-linking agent is methylenebisacrylamide, and the photoinitiator is azobisisobutylamidine hydrochloride, Specifically, the acrylamide solution (AAm / H2O) with a concentration of 100 mg / ml, the methylenebisacrylamide (MBAA) with a concentration of 9.72 mg / ml, and the azobisisobutylamidine salt with a concentration of 12.5 mg / ml were prepared. salt (V-50) was added to the water solvent, and stirred fo...

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Abstract

Provided are a polyacrylamide aerogel, a preparation method and application thereof. The preparation method comprises the following steps: preparing an acrylamide precursor solution; injecting the solution into a radial freezing device with radial temperature gradient to form ice crystals, and obtaining radially arranged frozen samples by controlling nucleation and growth of the ice crystals andsolute extrusion; carrying out low-temperature ultraviolet radiation crosslinking, and completely carrying out in-situ free radical polymerization reaction at uncrosslinked hole walls; executing freeze drying and pretreatment to obtain the polyacrylamide aerogel with a radial hierarchical porous structure. According to the method, the raw materials are easy to obtain, the operation is simple, theefficiency is high, the repeatability is good, the preparation method is a method for preparing the polyacrylamide aerogel in a large scale, and meanwhile a growth method of controlling ice crystals through the carefully designed radial freezing device is adopted and the ice crystals are used as templates, so that a special microstructure is obtained, and the special structure is fixed through a low-temperature ultraviolet radiation crosslinking method.

Description

technical field [0001] The invention belongs to the technical field of functional materials and fluid control, and in particular relates to a polyacrylamide airgel, a preparation method and an application thereof. Background technique [0002] Nowadays, with the progress of society and the development of economy, the problems of water resource shortage and water pollution have become more and more prominent, and the scarcity of fresh water resources is gradually being regarded as a global systemic crisis. At the same time, the earth's water storage is very rich, but the fresh water resources that humans can really use account for about 0.26% of the total water on the earth. The global fresh water resources are not only in short supply but also extremely uneven in regional distribution. In addition, since the industrial revolution, the demand for energy consumption in the world has been increasing. Especially in recent years, the price of oil has continued to rise, and global...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J3/24C08J3/28C08L33/26C08F220/56C08F222/38C08F2/48
CPCC08J9/28C08J3/24C08J3/28C08F220/56C08F2/48C08J2333/26C08J2201/0484C08F222/385
Inventor 刘爱萍许为中吴化平邢赟汪星
Owner ZHEJIANG SCI-TECH UNIV