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Preparation method of carbon nanotube composite hydrogel

A carbon nanotube composite and carbon nanotube technology, which is applied in the field of polymer material preparation, can solve the problems of weak mechanical strength, easy water loss, and low swelling rate of hydrogels, and achieve high water content, high mechanical strength, and low The effect of swelling rate

Inactive Publication Date: 2019-07-19
YANSHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a method for preparing a carbon nanotube composite hydrogel, aiming at weak mechanical strength, poor stability, easy absorption of a large amount of water and swelling of the hydrogel, and loose and porous structure causing moisture to easily The disadvantage of loss, by changing the technical route of the triple network hydrogel, adding carbon nanotubes and adopting a new preparation method, thus improving the thermal stability, mechanical properties and moisture content of the hydrogel, with low swelling rate

Method used

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  • Preparation method of carbon nanotube composite hydrogel
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  • Preparation method of carbon nanotube composite hydrogel

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preparation example Construction

[0038] The preparation method of the carbon nanotube composite hydrogel of the present invention specifically comprises the following steps:

[0039] S1. Take agar, polyvinyl alcohol, acrylic acid and the first raw material water accounting for 90% of the total raw material water according to the above mass ratio, add them to the first reactor, and remove the air in the first reactor under nitrogen protection, Place the first reactor in a sealed state in an oil bath at 85-95°C and heat for 5-10 minutes. The heating time in the oil bath should not be too long and cannot exceed 10 minutes, otherwise the polymerization reaction will easily be triggered. Stir continuously to form a uniform After solution, the first reactor was cooled to room temperature, and placed in a low-temperature environment of -1 to -10°C for 1 to 5 minutes to form a physically cross-linked first layer of agar network;

[0040] S2. Add the modified carbon nanotubes, ferric nitrate nonahydrate, crosslinking ...

Embodiment 1

[0046] S1, weigh 0.15g agar, 0.15g polyvinyl alcohol, 4g acrylic acid and 4.9797ml water, add in the first reactor, get rid of the air in the first reactor under nitrogen protection, and seal the first reactor Put it in an oil bath at 95°C and heat it for 5 minutes. After stirring continuously to form a uniform solution, cool the first reactor to room temperature and place it in an environment of -3°C for 5 minutes to form the first layer of physically cross-linked agar. The internet;

[0047] S2, respectively configure crosslinking agent aqueous solution and initiator aqueous solution with a concentration of 10mg / ml, 0.001g acidified carbon nanotubes, 0.12ml crosslinking agent aqueous solution, 0.2ml initiator aqueous solution, 0.15g ferric nitrate nonahydrate and 0.5533ml water Add to the second reactor and stir evenly;

[0048] S3, under the protection of nitrogen, the solution in the second reactor is added to the first reactor, and mixed evenly;

[0049] S4. Add the mix...

Embodiment 2

[0052] S1, take by weighing 0.15g agar, 0.25g polyvinyl alcohol, 4g acrylic acid and 4.8897ml water, join in the first reactor, get rid of the air in the first reactor under nitrogen protection, and the first reactor is sealed Put it in an oil bath at 95°C and heat it for 10 minutes. After stirring continuously to form a uniform solution, cool the first reactor to room temperature and place it in a -3°C environment for 5 minutes to form the first layer of physically cross-linked agar. The internet;

[0053] S2, respectively configure crosslinking agent aqueous solution and initiator aqueous solution with a concentration of 10mg / ml, 0.001g acidified carbon nanotubes, 0.12ml crosslinking agent aqueous solution, 0.2ml initiator aqueous solution, 0.15g iron nitrate nonahydrate, 0.5433ml water Add to the second reactor and stir evenly;

[0054] S3, under the protection of nitrogen, the solution in the second reactor is added to the first reactor, and mixed evenly;

[0055] S4. Ad...

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Abstract

The invention discloses a preparation method of carbon nanotube composite hydrogel. Raw materials in the following mass ratio are adopted: 0-2% of agar, 0-5% of polyvinyl alcohol, 30-50% of acrylic acid, 0-2% of ferric nitrate nonahydrate, 0-1% of a cross-linking agent, 0-1% of an initiator, 50-60% of water and 0-1% of modified carbon nanotubes. Through improvement of a technical route, the invention provides the brand new preparation method. The preparation method comprises the following steps: adopting a one-pot process, firstly conducting cooling to form a physically cross-linked first-layer brittle fragile agar network, conducting free radical polymerization to form a second-layer strong tough acrylic acid-iron ion network with an ion synergistic coordination effect, and conducting freezing and unfreezing circulation to form a third-layer physically cross-linked polyvinyl alcohol network, meanwhile, introducing carbon nanotubes into the triple network to serve as cross-linking points to enhance the cross-linking degree of gel to form covalent bonds and hydrogen bonds, so as to finally prepare the nanotube composite hydrogel with good thermal stability, high mechanical strength,high moisture content and low swelling rate.

Description

technical field [0001] The invention belongs to the technical field of polymer material preparation, and relates to a preparation method of carbon nanotube composite hydrogel. Background technique [0002] Hydrogels are hydrophilic polymers that can swell after absorbing water and retain a large amount of water and maintain their three-dimensional network structure. Generally speaking, hydrogels are chemically or physically cross-linked. Chemically cross-linked hydrogels are cross-linked by covalent bonds and are insoluble in water, while physically cross-linked hydrogels are cross-linked by van der Waals. Forces, ionic interactions, hydrogen bonds or hydrophobic interactions, these physical gels are sol-gel reversible. However, as a soft and wet material, hydrogel has weak mechanical strength, poor stability, easy to absorb a large amount of water and swell, and the loose and porous structure leads to easy loss of water and is easily damaged. Therefore, the preparation of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/075C08L33/02C08L5/12C08L29/04C08K9/02C08K3/04C08K3/28C08F220/06C08F222/38
CPCC08J3/075C08F220/06C08J2333/02C08J2429/04C08J2405/12C08K9/02C08K3/041C08K2201/011C08K3/28C08F222/385
Inventor 李青山姜兵燕大伟陆甲杰
Owner YANSHAN UNIV
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