Aramid mica nano composite material and industrial preparation method thereof

A composite material and aramid fiber technology, which is applied in the direction of synthetic cellulose/non-cellulose material pulp/paper, fiber raw material processing, plastic/resin/wax insulator, etc. The electrical properties of fiber-based insulating paper need to be improved to achieve the effects of preventing mutual attraction and approach, reducing production costs, and excellent thermal conductivity

Inactive Publication Date: 2021-04-13
通城县云水云母科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the preparation method of this patent application, mica is dispersed in dimethyl sulfoxide solvent, and then mixed with aramid nano-dispersion liquid. Dimethyl sulfoxide is a small molecular compound, which cannot make the mica scales well dispersed.
In addition, the mica dimethyl sulfoxide dispersion is added to the aramid nano-dispersion, and dimethyl sulfoxide is only a component of the aramid solvent. This addition is not conducive to the stability of the sol, and the electrical properties of the obtained aramid nanofiber-based insulating paper needs to be improved
In addition, the above-mentioned preparation method is limited to the small-scale test method in the laboratory range, and is not a preparation method that can be industrialized.
Due to the great disparity in the amount of materials handled, there is a huge difference between laboratory preparation and chemical production. The laboratory preparation method is often considered to be fast and convenient. The reactants are usually mixed in batches, while the chemical production needs to consider economy and output. , good material fluidity and other factors, therefore, it is difficult for laboratory research results to be directly applied to industrial production
Moreover, the materials in the laboratory can be discarded directly after use, but in industrial production, environmental friendliness, cost, yield, etc. must be considered. Therefore, it is necessary to develop a technical solution that can recycle materials and is suitable for industrial production.

Method used

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  • Aramid mica nano composite material and industrial preparation method thereof

Examples

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preparation example Construction

[0048] see figure 1 , the present invention provides a kind of industrial preparation method of aramid nanofiber mica composite material, and its technological process is specifically:

[0049] Mix aramid nanofibers and solvents to obtain an aramid nano-dispersion, add mica flakes to the aramid nano-dispersion to obtain a sol; after the sol is degassed by the instant defoaming machine 1, it is sprayed into the film making machine 2 In the process, the sol is solvent-exchanged with water or a low-concentration solvent aqueous solution to obtain a hydrogel, and then washed in a water washing device 3 and then dried by a dryer 4 to obtain an aramid nanofiber mica composite material.

[0050] Then it is coiled by the coiler 5, slitting by the slitter rewinder 6 or rewinded by the rewinder 8, and finally packaged to obtain the finished product of the aramid mica nanocomposite material.

[0051] In the following specific embodiments of the present invention, as an example, the sol ...

Embodiment 1

[0053] Embodiment 1 para-aramid fiber-muscovite nanocomposite material

[0054] (1) Take by weighing 400kg of poly-p-phenylene terephthalamide fiber, join 4000kg solvent (the mass ratio=1:50 of KOH:DMSO), stir 60h, form uniform aramid fiber nano-dispersion;

[0055] (2) Take muscovite 800kg, join in the aramid fiber nano-dispersion liquid, stir for 12h, obtain uniform p-aramid fiber synthetic mica sol;

[0056] (3) The sol is sprayed out through the nozzle and replaced with water to obtain a hydrogel, and after soaking for 4 hours, the water is changed for a total of 5 cycles to obtain a para-aramid nanofiber / muscovite hydrogel;

[0057] (4) Dry the para-aramid nanofiber / muscovite hydrogel in air at 60° C. for 60 minutes to obtain a para-aramid muscovite nanocomposite material.

[0058] After testing, the para-aramid nanofiber / synthetic mica insulating paper prepared in this example has a thickness of 50 μm, a dielectric strength of 180 kV / mm, and a tensile strength of 61.36 ...

Embodiment 2

[0059] Embodiment 2 p-aramid fiber phlogopite nanocomposite material

[0060] (1) Take by weighing 400kg of poly-p-phenylene terephthalamide fiber, join 20000kg solvent (the mass ratio of LiCl:DMA=1:10), stir 60h, form uniform aramid fiber nano-dispersion;

[0061] (2) Take phlogopite 400kg, join in the aramid fiber nano-dispersion liquid, stir 12h, obtain uniform p-aramid fiber synthetic mica sol;

[0062] (3) The sol is sprayed out through the nozzle and replaced with water to obtain a hydrogel. After soaking for 4 hours, the water is changed, and the water is circulated for 5 times to obtain the para-aramid nanofiber / phlogopite hydrogel;

[0063] (4) The para-aramid nanofiber / phlogopite hydrogel was dried in air at 70° C. for 50 min to obtain a para-aramid phlogopite nanocomposite material.

[0064] After testing, the para-aramid nanofiber / synthetic mica insulating paper prepared in this example has a thickness of 30 μm, a dielectric strength of 160 kV / mm, and a tensile st...

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Abstract

The invention provides an aramid nanofiber and mica composite material. The composite material comprises aramid nanofibers and mica flakes; and the aramid nanofibers have a three-dimensional network structure, and the mica flakes are distributed in the three-dimensional network structure. The aramid nanofiber and mica composite material has high electrical performance and mechanical performance and excellent thermal conductivity, insulativity and flame retardance, can replace mica tapes, aramid paper and aramid mica paper on the current insulating material market, and has good market prospects.

Description

technical field [0001] The invention relates to the technical field of insulating composite materials, and more specifically relates to an aramid mica nanocomposite material and an industrial preparation method thereof. Background technique [0002] In recent years, with the rapid development of capacitors and power transmission equipment, materials with excellent insulation and mechanical properties under extreme conditions have attracted much attention. At present, the most widely used material for motor insulation is mica tape, because mica itself has excellent electrical properties and high temperature resistance, for example, the dielectric strength of muscovite is 133-407kV / mm, and the highest energy is It is suitable for use as the main body of insulating inorganic materials, and the source of mica is wide, so it is easy to be widely used. However, the mechanical strength of the insulating paper made of mica is too low to be directly used for electrical insulation. I...

Claims

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Application Information

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IPC IPC(8): D21H13/26D21H13/44D21H27/12
CPCD21H13/26D21H13/44
Inventor 李俊李新辉冯清华朱淼潘斌海
Owner 通城县云水云母科技有限公司
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