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Aramid nanofiber-based layered composite film and preparation method and cyclic utilization method thereof

A technology of nanofibers and composite films, applied in chemical instruments and methods, synthetic resin layered products, layered products, etc., can solve the problem of poor uniformity and compactness, large time consumption, difficulty in large-scale production and practical application Requirements and other issues, to achieve the effect of uniform thickness and excellent comprehensive performance

Active Publication Date: 2020-10-02
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, with further requirements on the performance of aramid nanofiber films in downstream applications, the uniformity and compactness of the layered composite film materials prepared by the prior art are relatively poor, so that the performance per unit thickness needs to be further improved; Moreover, although the current preparation method can also obtain aramid nanofiber-based composite film with better performance, there are still problems such as large time consumption and low yield, which hinder its scale-up. From the perspective of practical application, it is still very difficult. Difficult to meet future mass production and practical application needs

Method used

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  • Aramid nanofiber-based layered composite film and preparation method and cyclic utilization method thereof
  • Aramid nanofiber-based layered composite film and preparation method and cyclic utilization method thereof
  • Aramid nanofiber-based layered composite film and preparation method and cyclic utilization method thereof

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preparation example Construction

[0093] The present invention also provides a method for preparing an aramid nanofiber-based composite film, comprising the following steps:

[0094] 1) After stirring and stripping the aramid fiber raw material, potassium-containing alkali, proton donor and solvent, an aramid nanofiber dispersion is obtained;

[0095] 2) After shearing and mixing the aramid nanofiber dispersion obtained in the above steps and the assembly element, a composite slurry is obtained;

[0096] 3) Spraying the composite slurry obtained in the above steps on the substrate to form a single-layer two-phase gel layer, and then spraying multiple times to obtain a composite gel;

[0097] 4) The composite gel obtained in the above steps is immersed in water for the first replacement, then dried to form a film, immersed in water again for the second replacement, then dried, and then subjected to hot pressing to obtain an aramid nanofiber-based composite film.

[0098] In the present invention, the structure...

Embodiment 1

[0158] Preparation of aramid nanofiber-natural mica nanosheet layered composite film material:

[0159] a. Preparation of aramid nanofiber dispersion: Weigh 20g of commercial aramid fiber, add it to a mixture of 2L dimethyl sulfoxide, 20g potassium hydroxide and 40mL water, and stir it mechanically for 48 hours to form a uniform aramid nanofiber. Fiber dispersion.

[0160] The aramid nanofiber dispersion prepared in Example 1 of the present invention was characterized.

[0161] see figure 2 , figure 2 It is a transmission electron microscope image of the aramid nanofiber prepared in Example 1 of the present invention.

[0162] Depend on figure 2 It can be seen that the diameter of the aramid nanofiber is about 11 nm.

[0163] b. Preparation of natural mica nanosheets: 50g of natural mica powder is placed in a heating device and heated to 800°C at a heating rate of 10°C / min for 1 hour; then 30g of calcined mica powder is placed in 500mL6mol / L nitric acid solution at 95°...

Embodiment 2

[0180] Preparation of aramid nanofiber-natural mica microsheet composite film material:

[0181]a. The preparation of aramid nanofiber is the same as in Example 1.

[0182] b. Take 26 mica micron flakes and add them to 40mL dimethyl sulfoxide, shake them sufficiently to disperse them evenly, then add them to 4L of 10mg / mL aramid nanofibers, seal and stir to make them evenly dispersed.

[0183] c. Connect the pipe of the automatic sprayer to the composite slurry, spray through the automatic sprayer, and control the spraying range with the help of the mechanical arm, (device such as Figure 9 shown), within 30 min, 4 L of the slurry was sprayed onto a 40*40 glass substrate to obtain a two-phase hydrogel of dimethyl sulfoxide and water.

[0184] see Figure 9 , Figure 9 It is a schematic diagram of the automatic spraying device adopted in the present invention.

[0185] see Figure 10 , Figure 10 It is an actual photo of the 40wt.% aramid nanofiber-mica layered composite ...

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Abstract

The invention provides an aramid nanofiber-based composite film. The composite film is of a layered structure. The composite film is formed by stacking a plurality of single-layer aramid nanofiber-based films. The aramid nanofiber-based film comprises an aramid nanofiber matrix and an assembly element; the assembly element includes one or more of an inorganic sheet material, an inorganic line material and a polymer. The aramid nanofiber-based composite film provided by the invention has a compact layered structure, the thickness of a single-layer film is uniform, and the nano-scale uniform interlayer spacing is extremely small, so that the composite film has excellent comprehensive performance. The invention further provides a simple and efficient large-scale preparation method and a cyclic utilization method. The prepared aramid nano-fiber-based layered composite film material can be made into aramid nano-fiber-based composite slurry again, and then the aramid nano-fiber-based composite slurry is made into the layered composite film material again by virtue of a spraying and hot pressing combined method, so that repeated cyclic utilization of the layered composite film material isrealized.

Description

technical field [0001] The invention belongs to the technical field of aramid nanofiber layered materials, and relates to an aramid nanofiber-based composite film and a preparation method thereof, and a method for recycling the aramid nanofiber-based composite film, in particular to an aramid nanofiber-based composite film A composite film and its preparation method, and a method for recycling the aramid nanofiber-based composite film. Background technique [0002] The full name of aramid fiber is "poly-p-phenylene terephthalamide", which is Aramid fiber in English. It is a new type of high-tech synthetic fiber with ultra-high tensile strength, high modulus, high temperature resistance, acid and alkali resistance, Excellent properties such as low density, its strength is 5 to 6 times that of steel wire, its modulus is 2 to 3 times that of steel wire or glass fiber, its toughness is 2 times that of steel wire, and its density is only about 1 / 5 of that of steel wire. Under th...

Claims

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Application Information

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IPC IPC(8): C08J5/18C08L77/10B32B27/34B32B27/12
CPCB32B27/12B32B27/34C08J5/18C08L77/10
Inventor 俞书宏潘晓锋高怀岭
Owner UNIV OF SCI & TECH OF CHINA
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