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Aramid paper compounded with aramid nanometer fiber thin film and preparation method thereof

A nanofiber, para-aramid fiber technology, applied in special paper, synthetic cellulose/non-cellulose material pulp/paper, fiber raw material processing, etc. Problems such as problems occur to achieve the effects of improving mechanical properties and insulation properties, large aspect ratio and specific surface area, and high bonding strength

Active Publication Date: 2018-07-24
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this kind of method has the following problems: First, no matter what kind of non-aramid film is used, such as PET or PPS or PI film, there are differences in the strength performance, heat resistance and thermal conductivity of the film itself and aramid paper Sexual problems, resulting in the performance of the final product being limited by materials with poorer performance. For example, PET film composite aramid paper is more prone to warping, shrinkage or wrinkling, and it is difficult to obtain products with excellent quality and stability; second, in the paper film Adhesives are still needed for most of the composite processing, and ordinary adhesives will limit the final performance of the product. When paper products are applied to wet oil-immersed transformers, there may be adhesives that dissolve into insulating oil or lubricating oil, resulting in product quality problems

Method used

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  • Aramid paper compounded with aramid nanometer fiber thin film and preparation method thereof
  • Aramid paper compounded with aramid nanometer fiber thin film and preparation method thereof

Examples

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preparation example Construction

[0048] A preparation method of the above-mentioned aramid nanofiber film composite aramid paper, comprising the following steps:

[0049] Step 1: Disperse and disperse para-aramid chopped fibers for 10,000 to 30,000 r, add polyethylene oxide with a molecular weight of 5 million as a dispersant, and use an amount of 0.1 to 0.5 of the absolute dry mass of para-aramid chopped fibers %, made slurry suspension A;

[0050] Step 2: fibrillating para-aramid pulp fibers or para-aramid fibrid fibers until the degree of beating reaches 45-60°SR, and then dissolving and dispersing for 10000-20000r to obtain slurry suspension B;

[0051] Step 3: Stir and mix the slurry suspension A and slurry suspension B obtained in step 1 and step 2 at a speed of 500-1500 rpm for 5-30 minutes to obtain slurry suspension C;

[0052] Step 4: Add a dispersant to the water-dispersed aramid nanofiber, wherein the dispersant is a cationic polyacrylamide, and the dosage of the cationic polyacrylamide is 0.01 t...

Embodiment 1

[0057] An aramid paper composited with aramid nanofiber film, wherein the aramid paper composited with aramid nanofiber film is composed of a surface layer, a core layer and a bottom layer through wet papermaking lamination, without any adhesive bonding; The above-mentioned surface layer, core layer and bottom layer, in terms of dry fiber weight parts, the ratio between them is 5:90:5; the surface layer and bottom layer are all made of water-dispersed aramid fiber nanofibers. Aramid nanofilm, the core layer is aramid paper prepared from para-aramid chopped fibers and para-aramid pulp fibers, and the quality of para-aramid chopped fibers and para-aramid pulp fibers The ratio is 3:7.

[0058] Wherein, water-dispersed aramid fiber nanofiber is made by following preparation steps:

[0059] Step (1): 1.0g para-aramid yarn fiber, 1.5g potassium hydroxide (KOH) and 500ml dimethyl sulfoxide (DMSO) are placed in a container, and stirred at a temperature of 30°C under sealed conditions...

Embodiment 2

[0072] An aramid paper composited with aramid nanofiber film, wherein the aramid paper composited with aramid nanofiber film is composed of a surface layer, a core layer and a bottom layer through wet papermaking lamination, without any adhesive bonding; The surface layer, the core layer and the bottom layer, in terms of dry fiber weight parts, the ratio between them is 8:84:8; the surface layer and the bottom layer are all made of aramid nanofibers. film, the core layer is an aramid paper prepared from para-aramid chopped fibers and para-aramid fibrids, and the mass ratio of para-aramid chopped fibers and para-aramid fibrids is 3.5:6.5.

[0073] Wherein, water-dispersed aramid fiber nanofiber is made by following preparation steps:

[0074] Step (1): 1.0g of para-aramid chopped fiber, 1.5g of potassium hydroxide (KOH) and 500ml of dimethyl sulfoxide (DMSO) are placed in a container, and stirred at a temperature of 40°C under sealed conditions After 7 days, the aramid nanofi...

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Abstract

The invention discloses an aramid paper compounded with an aramid nanometer fiber thin film and a preparation method thereof. The aramid paper is compounded by a surface layer, a core layer and a bottom layer through a wet type papermaking laminating method, wherein the ratio of the surface layer to the core layer to the bottom layer is (5 to 20):(60 to 90):(5 to 20) in parts by weight of absolutedry fiber; the surface layer and the bottom layer respectively adopt aramid nanometer films which are prepared from aramid nanometer fibers; the core layer adopts the aramid paper which is prepared from one of aramid chopped fibers and aramid pulp fibers or aramid precipitated fibers. The aramid paper has the advantages that because of excellent strength property and dense thin film structure ofthe aramid nanometer fiber film, more bonding sites are provided for bonding with the fiber components of the aramid paper, and the larger pores can be filled and coated; the comprehensive property ofthe final product is greatly improved, and the aramid paper is favorably widened to the high-end application field.

Description

technical field [0001] The invention belongs to the field of polymer nanomaterials and papermaking, and in particular relates to aramid nanofiber film composite aramid paper and a preparation method thereof. Background technique [0002] Para-aramid fiber (PPTA) is a high-performance synthetic fiber with high strength, high modulus, excellent insulation and high temperature resistance, and is an ideal raw material for protective and reinforcing materials. Para-aramid paper is made of para-aramid chopped fibers and para-aramid pulp fibers or para-aramid fibrids as raw materials through wet papermaking and hot-pressing process. In para-aramid paper, chopped fibers are used as a skeleton material, which is evenly dispersed in the paper, which determines the physical strength and mechanical structure of the paper; aramid pulp is used as a filling and bonding material, which is softened and deformed during the hot pressing process Stretching, forming the overall mechanical struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H27/30D21H13/26D21H21/10D21H21/08D21F11/00B32B27/34
CPCB32B27/34D21F11/00D21H13/26D21H21/08D21H21/10D21H27/30
Inventor 杨斌张美云陆赵情宋顺喜罗晶晶
Owner SHAANXI UNIV OF SCI & TECH
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