Preparation method of high-strength nano cellulose-nano aramid fiber composite film

A nanocellulose and composite film technology, applied in the field of nanomaterials, can solve the problems of the lack of charge repulsion of ordinary nanocellulose, the decrease of the strength of the nanoaramid film, and the difficulty in dispersing the nanoaramid fiber, so as to increase the strain, improve the toughness, and increase the stress. The effect of improving the transfer efficiency

Active Publication Date: 2021-09-03
广东松恒科技有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

However, the strength of nano-cellulose is lower than that of nano-aramid fibers. From the perspective of strength enhancement, the filling of nano-cellulose will reduce the strength of nano-aramid membranes.
Moreover, ordinary nanocellulose lacks strong charge repulsion, and it is easy to aggregate in DMSO, so it is difficult to obtain good dispersion in nano-aramid fibers.

Method used

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  • Preparation method of high-strength nano cellulose-nano aramid fiber composite film
  • Preparation method of high-strength nano cellulose-nano aramid fiber composite film
  • Preparation method of high-strength nano cellulose-nano aramid fiber composite film

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Embodiment 1

[0035] The preparation method of the pure nano-aramid film in the present embodiment, the specific preparation steps are as follows:

[0036] (1) Disperse 1 g of para-aramid chopped fibers in 500 mL of DMSO, add 1.5 g of KOH, and continue stirring for 7 days to obtain a nano-aramid dispersion with a concentration of 2 mg / L.

[0037] (2) Add 100mL DMSO to 132.47mL nano-aramid dispersion. Subsequently, 132.47 mL of deionized water was added to protonate the nano-aramid fiber, and then the solution was sheared at 40000 r / min for 5 min.

[0038] (3) The solution was ultrasonically treated at 800W for 5 minutes, and then the nano-aramid hydrogel was obtained by vacuum filtration. Add 100 mL of deionized water to the filter, filter and wash the nano-aramid hydrogel to remove residual DMSO and KOH.

[0039] (4) The nano-aramid hydrogel was hot-pressed at 80°C for 24 hours to finally obtain a nano-aramid film with a quantitative value of 60g / m 2 .

Embodiment 2

[0041] The preparation method of the high-strength nano-cellulose-nano-aramid fiber composite film in this embodiment, the specific preparation steps are as follows:

[0042] (1) Disperse 1 g of para-aramid chopped fibers in 500 mL of DMSO, add 1.5 g of KOH, and continue stirring for 7 days to obtain a nano-aramid dispersion with a concentration of 2 mg / L.

[0043] (2) Disperse 10 g of dry bleached softwood pulp in 1 L of deionized water, add 160 mg of 2,2,6,6-tetramethylpiperidine nitrogen oxide and 1 g of sodium bromide, and stir to disperse evenly. Then add 75mmol sodium hypochlorite solution to carry out TEMPO oxidation reaction, and keep the pH of the suspension stable at 10-10.5. After the reaction, the suspension was washed by centrifugal filtration until the pH of the filtrate reached neutral. The treated suspension was fibrillated using a micro-fluid homogenizer at a concentration of 0.8 wt%, using a pore size of 200 μm, and homogenized 8 times under a pressure of 138 ...

Embodiment 3

[0048] The preparation method of the high-strength nano-cellulose-nano-aramid fiber composite film in this embodiment, the specific preparation steps are as follows:

[0049] (1) Disperse 1 g of para-aramid chopped fibers in 500 mL of DMSO, add 1.5 g of KOH, and continue stirring for 7 days to obtain a nano-aramid dispersion with a concentration of 2 mg / L.

[0050] (2) Disperse 10 g of dry bleached softwood pulp in 1 L of deionized water, add 160 mg of 2,2,6,6-tetramethylpiperidine nitrogen oxide, and 1 g of sodium bromide, and stir to disperse evenly. Then add 75mmol sodium hypochlorite solution to carry out TEMPO oxidation reaction, and keep the pH of the suspension stable at 10-10.5. After the reaction, the suspension was washed by centrifugal filtration until the pH of the filtrate reached neutral. The treated suspension was fibrillated using a micro-fluid homogenizer at a concentration of 0.8 wt%, using a pore size of 200 μm, and homogenized 8 times under a pressure of 1...

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Abstract

The invention discloses a preparation method of a high-strength nano cellulose-nano aramid fiber composite film. The preparation method comprises the steps of mixing TEMPO oxidized nano cellulose dispersed in dimethyl sulfoxide with a nano aramid fiber dispersion, then protonating the nano aramid fiber, carrying out ultrasonic treatment on the mixed solution, and finally carrying out vacuum filtration and hot pressing treatment to obtain the high-strength composite film. The nano cellulose-nano aramid fiber composite film has high strength, the maximum tensile force of the nano cellulose-nano aramid fiber composite film can reach 344.43 MPa, and the toughness of the nano cellulose-nano aramid fiber composite film can reach 72.99 MJ / m < 3 >. Meanwhile, the TEMPO oxidized nanocellulose is relatively small in size, relatively low in length-diameter ratio and excellent in dispersing performance, so that the transparency of the film is effectively improved after the TEMPO oxidized nanocellulose is added. The application range of the nanocellulose is expanded, and an idea is provided for development of high-strength and high-toughness materials.

Description

technical field [0001] The invention belongs to the field of nanometer materials, and in particular relates to a preparation method of a high-strength nanocellulose-nanometer aramid fiber composite film. Background technique [0002] Aramid fiber is widely used in military industry, aerospace, automobile and special clothing and other fields due to its excellent properties such as high strength, high temperature resistance, acid and alkali resistance, insulation, and low density. On the one hand, the nano-aramid fiber prepared by using para-aramid fiber as raw material through DMSO / KOH system inherits many excellent properties of para-aramid fiber, and on the other hand, it obtains ultra-high specific surface area and aspect ratio, which can It can be used as a substrate to combine other nanomaterials to prepare functionalized nanocomposites, and on the other hand, it can also be used as a reinforcing phase to strengthen other materials. Moreover, due to the combination of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J5/18C08L77/10C08L1/02
CPCC08J5/18C08J2377/10C08J2401/02
Inventor 曾劲松胡复港
Owner 广东松恒科技有限公司
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