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Aramid paper and preparation method thereof

A technology of aramid paper and aramid precipitated fiber, which is applied in the field of insulating paper, can solve the problems of yellowing, air bubbles or black spots, and easy oxidation on the paper surface, achieve high smoothness, improve tensile strength and tear The effect of improving the compressive strength

Active Publication Date: 2018-02-02
丁秀臣 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of aramid fiber paper and its preparation method, which can solve the problem that the heat treatment process in the prior art is carried out in the air, which is easy to be oxidized, so that the surface of the paper becomes yellow, white spots, bubbles or black spots appear. Disadvantages of waiting for paper problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Containing the meta-aramid fiber fibrids of antioxidant 1wt% and arylsulfone fiber fibrids are dispersed in water, then length is 0.8mm meta-aramid ultra-short fiber and aryl sulfone ultra-short fiber and length is 8mm Meta-aramid short-cut fibers, wherein ultra-short fibers account for 20wt% of the whole short-cut fibers, the latter is 80wt%, after being mixed evenly, they are dispersed in water, and then the two dispersions are based on 30wt% precipitated fibers and 70wt% The chopped fibers are mixed, and the mixed solution is wet mixed with inclined wire, pressed, dried, and prepared into base paper, and the base paper is heat-treated. Specifically, the upper roll is a soft roll with small round protrusions with a diameter of 0.01mm. , the lower roll is a heated hard roll. Under vacuum conditions, when the temperature is 320 degrees and the negative pressure is -0.1MPa, the base paper is heat-treated to obtain a quantitative 40g / m 2 , aramid paper with a thickness of...

Embodiment 2

[0023] The meta-aramid fibrid fiber and polysulfone fiber fibrid containing antioxidant 1.5wt% are dispersed in water, and then length is 1.5mm meta-aramid ultra-short fiber and polysulfone ultra-short fiber and length 10mm Meta-aramid fibers, wherein ultra-short fibers account for 25wt% of the entire chopped fibers, the latter is 75wt%, after mixing evenly, disperse in water, and then the two dispersions are based on 50wt% precipitated fibers and 50wt% chopped fibers The fibers are mixed, and the mixed solution is subjected to inclined wire wet-making, pressing, and drying to prepare base paper, which is then heat-treated. Specifically, the upper roll is a soft roll with small round protrusions with a diameter of 0.05 mm, and the lower roll is a soft roll with a diameter of 0.05 mm. The roll is a heated hard roll. Under vacuum conditions, when the temperature is 300 degrees and the negative pressure is -0.25MPa, the base paper is heat-treated to obtain a weight of 41g / m 2 , a...

Embodiment 3

[0025] The meta-aramid fiber fibrids and polysulfone fiber fibrids containing antioxidant 2wt% are dispersed in water, and then the meta-aramid ultra-short fibers and polysulfone ultra-short fibers with a length of 2 mm and the inter-position fibers with a length of 12 mm Aramid short-cut fiber, wherein the ultra-short fiber former accounts for 30wt% of the whole short-cut fiber, and the latter is 70wt%, after mixing evenly, it is dispersed in water, and then the two dispersions are based on 70wt% precipitated fiber and 30wt% The chopped fibers are mixed, and the mixture is wet-laid with inclined wire, squeezed, and dried to prepare base paper, which is then heat-treated. Specifically, the upper roll is a soft roll with small round protrusions with a diameter of 1 mm. The lower roll is a heated hard roll. Under vacuum conditions, when the temperature is 280 degrees and the negative pressure is -0.4MPa, the base paper is heat-treated to obtain a 40g / m 2 , aramid paper with a th...

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Abstract

The invention discloses a preparation method of aramid paper, comprising the following steps: 30-70 wt% of aramid fibrid containing an anti-oxidant (which is an oxide of bismuth or bismuth hydroxide)and 30-70 wt% of aramid chopped fiber are mixed for papermaking to form raw paper; then, the obtained raw paper undergoes hot-pressing treatment, wherein one of two pressure rollers is a soft roller and the other one of the two pressure rollers is a hot-hard roller; as for heat treatment, a high-temperature negative-pressure vacuum-pumping calendering technology is adopted for calendaring of the raw paper, wherein there are many round bulges on the surface of the soft roller. With the addition of the anti-oxidant, the paper is avoided from being oxidized and yellowed during the papermaking process. With the addition of the chopped fiber, dispersion of fiber in water can be enhanced, and some slightly large gaps in the paper can be filled up during the papermaking process. In the hot-pressing process, extrusion of the small bulges on the surface of the soft roller is beneficial to discharge of water vapor inside the paper.

Description

technical field [0001] The invention relates to the field of insulating paper, more specifically an aramid paper and a preparation method thereof. Background technique [0002] Meta-aramid fiber, the English name is Poly(m-phenylene isophthalamide) fiber (abbreviation: PMIA), an aromatic polyamide fiber containing at least 85% of amide bonds (-CO-NH-) in the molecular chain, has excellent Excellent mechanical properties, heat resistance, flame resistance, stable chemical properties, good softness and textile processability. [0003] The traditional meta-aramid paper is prepared by mixing aramid precipitated fiber and chopped fiber according to a certain ratio to make base paper, and then heat-treating the base paper by high-temperature and high-pressure calendering technology, such as the Chinese patent The publication number is CN104818647A, which discloses a method for producing meta-aramid paper, which is specifically made by mixing pure meta-aramid fibrids and single-le...

Claims

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Application Information

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IPC IPC(8): D21H13/26D21H15/02D21H21/38D21H17/63D21H27/00
CPCD21H13/26D21H15/02D21H17/63D21H21/38D21H27/00
Inventor 丁秀臣
Owner 丁秀臣
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