Aramid nanofiber-based insulation paper and preparation method thereof

A nanofiber, aramid fiber technology, applied in special paper, synthetic cellulose/non-cellulose material pulp/paper, organic insulators, etc., can solve the problem of small specific surface area of ​​fibers, little improvement in mechanical properties, and inability to achieve industrial production and other problems, to achieve the effect of realizing industrialized production, beneficial to industrialized production, and simple preparation method

Active Publication Date: 2019-11-22
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patented technology allows for creating an improved type of material called nano fiber that combines properties from different materials together into one product with superior performance compared to traditional methods like plasterboard or wood board.

Problems solved by technology

Technological Problem: It's important to note that current options are limited due to their weaknesses in terms of thermal stability or mechanical property requirements when applied to electricity insulations (MCI). Specifically, existing MCA films lack sufficient durable physical protection against severe environmental factors like humors, oil spills, etc., making them unsuitable for long term applications where they require more frequent maintenance. To address this issue, researchers developed new types of insulators called imide glass ceramics (IMOC) that combine good electrically conductivity but also possess strong mechanical qualities. These materials offer better reliance than traditional magnetic steel sheets without adding extra layers.

Method used

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  • Aramid nanofiber-based insulation paper and preparation method thereof
  • Aramid nanofiber-based insulation paper and preparation method thereof
  • Aramid nanofiber-based insulation paper and preparation method thereof

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preparation example Construction

[0040] The present invention provides a method for preparing aramid nanofiber-based insulating paper described in the above scheme, comprising the following steps:

[0041] (1) mixing strong alkali, dimethyl sulfoxide and aramid fiber to obtain aramid nanofiber dispersion;

[0042] (2) mixing dimethyl sulfoxide and the insulating inorganic material to obtain a dispersion of the insulating inorganic material;

[0043] (3) mixing the aramid nanofiber dispersion and the insulating inorganic material dispersion to obtain a sol;

[0044] (4) Solvent-exchanging the sol with water to obtain a hydrogel;

[0045] (5) drying the hydrogel to obtain an aramid nanofiber-based insulating paper;

[0046] The steps (1) and (2) are not limited by time sequence.

[0047]The invention mixes strong alkali, dimethyl sulfoxide and aramid fibers to obtain aramid nanofiber dispersion liquid. In the present invention, the strong base is preferably one or more of potassium hydroxide, potassium etho...

Embodiment 1

[0057] Preparation of aramid nanofiber-based insulating paper (para-aramid nanofiber / synthetic mica insulating paper):

[0058] (1) Weigh 0.4 g of commercial poly-p-phenylene terephthalamide fiber, add it to 19.4 mL of dimethyl sulfoxide and 0.2 g of potassium ethoxide mixture, and mechanically stir for 60 hours to form uniform aramid nanofibers Dispersions;

[0059] (2) Weigh 0.24 g of synthetic mica, add it to 19.76 mL of dimethyl sulfoxide solution, and stir rapidly under mechanical stirring for 12 hours to obtain a uniform synthetic mica dispersion;

[0060] (3) Mix the aramid nanofiber dispersion prepared in step (1) with the synthetic mica dispersion prepared in step (2), mechanically stir for 10 h at a speed of 1200 rpm to form a sol, and pour it into a flat-bottomed plastic dish with a diameter of 5.5 cm ;

[0061] (4) Soak the sol of step (3) in distilled water, dimethyl sulfoxide and potassium ethylate in the sol diffuse into the water, and the water diffuses into ...

Embodiment 2

[0068] Preparation of aramid nanofiber-based insulating paper (para-aramid nanofiber / muscovite insulating paper):

[0069] (1) Weigh 0.4 g of commercial poly-p-phenylene terephthalamide fiber, add it to 19.2 mL of dimethyl sulfoxide and 0.4 g of potassium hydroxide mixture, and stir it mechanically for 60 hours to form a uniform aramid nanofiber fiber dispersion;

[0070] (2) Weigh 0.24 g of muscovite, add it to 19.76 mL of dimethyl sulfoxide solution, and stir rapidly under mechanical stirring for 12 hours to form a uniform muscovite dispersion;

[0071] (3) Mix the aramid nanofiber dispersion prepared in step (1) with the muscovite dispersion prepared in step (2), and mechanically stir for 10 h at a speed of 1200 rpm to form a sol;

[0072] (4) Pour the sol of step (3) into a 60mL syringe, fix the syringe on the syringe pump, control the continuous injection of the syringe through the syringe pump, flow through the mold with a rectangular cross-section outlet, and flow into...

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Abstract

The invention provides aramid nanofiber-based insulation paper and a preparation method thereof, and relates to the technical field of insulation composite materials. The aramid nanofiber-based insulation paper provided by the invention comprises aramid nanofibers and an insulation inorganic material, wherein the aramid nanofiber has a bifurcated geometrical shape and forms a three-dimensional network structure, and the insulation inorganic material is distributed in the three-dimensional network structure. The aramid nano-fiber paper provided by the invention has relatively high electrical performance and mechanical performance and excellent insulation and flame retardance, can replace mica tapes, aramid paper and aramid mica paper in the current insulation market, and reduces the thickness for insulation. The invention provides the preparation method of the aramid nanofiber-based insulation paper, and the preparation method provided by the invention is simple, has excellent operability, can be further used for continuous preparation, and is beneficial to industrial production.

Description

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Claims

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Application Information

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Owner HUNAN UNIV
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