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Preparation method of aerogel based on double network structure design

A network structure and aerogel technology, applied in the field of materials, can solve the problems of lack of strength and elasticity of fibers, poor pore structure, environmental protection, and poor mechanical properties, and achieve the effects of low price, easy collapse, and excellent performance

Inactive Publication Date: 2018-06-22
DALIAN POLYTECHNIC UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a preparation method of sodium alginate and acrylamide composite airgel, which can make sodium alginate and polyacrylamide form a double network structure, and improve the lack of fibers prepared with sodium alginate as raw material. Strength and elasticity, poor mechanical properties, after freeze-drying, the fibers tend to collapse, and the pore structure is not easy to retain environmental protection problems

Method used

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  • Preparation method of aerogel based on double network structure design
  • Preparation method of aerogel based on double network structure design
  • Preparation method of aerogel based on double network structure design

Examples

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Embodiment 1

[0039] This example discloses a method for preparing airgel based on double network structure design, which is prepared by the following method:

[0040] Put 2g of sodium alginate, 1g of acrylamide, 0.05g of N-methylenebisacrylamide and 0.04g of ammonium persulfate into a beaker, then add 100mL of deionized water to make a solution, seal it and place it at a constant temperature of 60°C Stir in a water bath at a constant speed for 3 hours, then put it in a refrigerator for refrigeration, let it stand and defoam, so as to serve as a gel solution.

[0041] Dissolve 24g of anhydrous calcium chloride in 800mL of deionized water to prepare a calcium chloride solution with a mass concentration of 3% as the coagulation bath solution.

[0042]After the degassing of the gel solution is completed, the gel solution is extruded into the configured coagulation bath by controlling the extrusion rate of the extruder to 9mm / min and the diameter of the nozzle hole to 1.2mm, and extruded from t...

Embodiment 2

[0047] This example discloses a method for preparing airgel based on double network structure design, which is prepared by the following method:

[0048] Pour 1g of acrylamide, 0.05g of N-methylenebisacrylamide, and 0.04g of ammonium persulfate into a beaker, then add 100mL of deionized water, seal it well, and stir in a water bath at 60°C at a constant speed 0.5h, then pour 2g of sodium alginate into the beaker, continue to stir at a constant speed for 2.5h, then put it in the refrigerator for refrigeration, let it stand and defoam, as a gel solution.

[0049] Dissolve 24g of anhydrous calcium chloride in 800mL of deionized water to prepare a calcium chloride solution with a mass concentration of 3% as the coagulation bath solution.

[0050] After the degassing of the gel solution is completed, the gel solution is extruded into the configured coagulation bath by controlling the extrusion rate of the extruder to 9mm / min and the diameter of the nozzle hole to 1.2mm, and extrude...

Embodiment 3

[0053] This example discloses a method for preparing airgel based on double network structure design, which is prepared by the following method:

[0054] Put 2g of sodium alginate, 1g of acrylamide, 0.05g of N-methylenebisacrylamide and 0.04g of ammonium persulfate into a beaker, then add 100mL of deionized water to make a solution, seal it and put it in a constant temperature water bath at 60°C Stir in the pot at a constant speed for 3 hours, then put it in the refrigerator to refrigerate, let it stand and defoam, so as to be used as a gel solution.

[0055] Dissolve 24g of anhydrous calcium chloride in 800mL of deionized water to prepare a calcium chloride solution with a mass concentration of 3% as the coagulation bath solution.

[0056] After the degassing of the gel solution is completed, by controlling the extrusion rate of the extruder to 5mm / min and the diameter of the nozzle hole to 1.2mm, the gel solution is extruded from the nozzle hole at a height of 20cm from the ...

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Abstract

The invention discloses a preparation method of an aerogel based on a double network structure design. The method comprises the steps that a sodium alginate is added by a one-step or two-step method by radical polymerization to form a gel solution of a polyacrylamide chemical cross-linking network interpenetrating sodium alginate structure, gel is extruded into a coagulation bath to form microspheres or fiber and other forms, at the same time, calcium alginate ion cross-linking is formed through ion exchange, and finally a double-network structure hydrogel interlocking chemical cross-linking and ion cross-linking is formed. After washing with water and freeze-drying, finally an aerogel is obtained. The aerogel exhibits a microscopic multi-layered pore structure with large pore nested mesopores and micropores. According to the preparation method of the aerogel based on the double network structure design, the sodium alginate and acrylamide are utilized to prepare the composite aerogel,the application of an aerogel material in actual production is expanded, and moreover theerogel material has outstanding characteristics of economy, environmental protection, biocompatibility, degradation and the like compared with other aerogel materials, not only can be processed into microspheres, massive structure, but also can directly be processed into fiber morphology.

Description

technical field [0001] The invention belongs to the field of materials, in particular to a preparation method and application of sodium alginate and acrylamide composite airgel. Background technique [0002] Aerogels are nanoporous materials. Because of its low thermal conductivity, low density, high porosity, and large specific surface area, it is widely used in adsorbents, insulating materials, and other fields. Polymer-based aerogels can be designed into multilayer structures and have advantages over other aerogels, such as silica aerogels, carbon nanotube aerogels, resorcinol-formaldehyde aerogels, and algae, etc. Biopolymer aerogels are widely available, reproducible, low-cost, and non-toxic; therefore, they are receiving increasing attention. [0003] Polymer aerogels are prepared by using chemical or physical cross-linked networks, which can be regulated by multi-level structures to produce a wider range of properties; biomass aerogels are more versatile because of ...

Claims

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Application Information

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IPC IPC(8): C08L5/04C08L33/26C08J9/28C08J3/075C08F220/56C08F222/38D01F8/18D01F8/10C08L63/00
CPCC08F220/56C08J3/075C08J9/28C08J2201/0504C08J2305/04C08J2433/26C08L63/00C08L2205/03C08L2205/04D01F8/10D01F8/18C08L5/04C08L33/26C08F222/385
Inventor 张鸿孟驰涵邹新全周炜东李会涛
Owner DALIAN POLYTECHNIC UNIVERSITY
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