Method for preparing aramid paper from para aramid fibrid as raw material

A para-aramid and precipitated fiber technology, which is applied in the field of special fiber synthetic aramid paper manufacturing, can solve the negative effects of paper formation and paper performance, and can not fully reflect the fiber's high strength, high modulus, and aramid fiber wadding To solve problems such as severe problems, to achieve the effect of improving mechanical strength and dielectric properties, strong innovation, and upgrading product grades

Inactive Publication Date: 2014-02-12
SHAANXI UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

[0008] The common point of the above patents is that they all use para-aramid chopped fibers and para-aramid pulp or meta-aramid fibrids for papermaking. The defect is that the aramid fibers are flocculated in the water medium Strong and difficult to disperse, it will have a negative impact on paper formation and paper performance; secondly, para-aramid paper also lacks effective bonding between fibers due to the rigid structure of aramid fiber molecular chains and the chemical inertness of the fiber surface. It reflects the characteristics of high strength and high modulus of the fiber itself; finally, in the preparation process of para-aramid paper, it is still slightly difficult for the current method to meet some higher requirements, so it is necessary to find a new raw material or new process to Preparation of aramid paper with better performance

Method used

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Effect test

Embodiment 1

[0032] The mass molar concentration of aramid chopped fiber is 1.5×10 -3 mol / L, LAS solution at a temperature of 40°C for washing and pretreatment, and then washed with water for later use; add 0.1% polyethylene oxide (PEO), and use a tank beater to short the para-aramid fibers after washing and pretreatment Cut the fibers and decompose to make slurry A; use the para-aramid pulp fiber to be beaten with a trough beater, and the beating degree is controlled at 35°SR to make slurry B; the slurry prepared by dispersion treatment A and slurry B are mixed according to the ratio of 5:5; through the wet forming process, the para-aramid base paper is copied on the inclined wire former, and the concentration on the Internet is 0.01-0.10%. The temperature is 240-270°C, the pressure is 12-17MPa, and the roll speed is 1.0-2.0m / min. Under the conditions of hot pressing for 3-10min, para-aramid paper is obtained.

Embodiment 2

[0034] The mass molar concentration of aramid chopped fiber is 2.0×10 -3 mol / L, the temperature is 60 ℃ LAS solution for washing and pretreatment, and then wash with water for later use; add 0.5% polyethylene oxide (PEO), and use the tank beater to make the para-aramid short after washing and pretreatment Cut the fibers and decompose to make slurry A; use the para-aramid pulp fiber to be beaten with a trough beater, and the beating degree is controlled at 45°SR to make slurry B; the slurry prepared by dispersion treatment A and pulp B are mixed according to the ratio of 7:3; through the wet forming process, the para-aramid base paper is copied on the inclined wire former, and the concentration on the Internet is 0.01-0.10%. The temperature is 240-270°C, the pressure is 12-17MPa, and the roll speed is 1.0-2.0m / min. Under the conditions of hot pressing for 3-10min, para-aramid paper is obtained.

Embodiment 3

[0036] The mass molar concentration of aramid chopped fiber is 3.0×10 -3 mol / L, LAS solution at a temperature of 90°C for washing and pretreatment, and then washed with water for later use; add 1.0% polyethylene oxide (PEO), and use a tank beater to short the para-aramid fibers after washing and pretreatment. Cut the fibers and decompose to make slurry A; use the para-aramid pulp fiber to be beaten by a trough beater, and the beating degree is controlled at 55°SR to make slurry B; the slurry prepared by dispersion treatment A and pulp B are mixed according to the ratio of 9:1; through the wet forming process, the para-aramid base paper is copied on the inclined wire former, and the concentration on the net is 0.01-0.10%. The temperature is 240-270°C, the pressure is 12-17MPa, and the roll speed is 1.0-2.0m / min. Under the conditions of hot pressing for 3-10min, para-aramid paper is obtained.

[0037]Compared with the aramid paper made of para-aramid pulp fiber, the comprehensi...

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Abstract

The invention discloses a method for preparing aramid paper from para aramid fibrid as a raw material. The method concretely comprises the steps of carrying out treatment and dispersion on para aramid chopped fibers; pulping the para aramid fibrid and mixing the pulp; preparing the paper from the pulp by using a wet process; molding by hot pressing. According to the method for preparing the aramid paper from the para aramid fibrid as the raw material, the para aramid fibrid has relatively highly concentrated length and width distribution and a relatively large specific surface area and can be relatively well combined with the para aramid chopped fibers as binding materials; the prepared aramid paper has relatively good mechanical strength, heat resistance and dielectric properties, and is widely applied to the fields of high-temperature insulation, electronics and electric power, communication and transportation, aerospace and the like.

Description

technical field [0001] The invention belongs to the technical field of manufacturing special fiber synthetic aramid paper, and in particular relates to a method for preparing aramid paper by using para-aramid precipitated fiber as a raw material. Background technique [0002] Para-aramid fiber (poly-p-phenylene terephthalamide) has special properties such as high strength, high modulus, high temperature resistance, corrosion resistance, etc., and has both the mechanical properties of inorganic fibers and the processing properties of organic fibers. Our products are in three forms: chopped fiber, pulp fiber and precipitated fiber. With the development of modern papermaking industry, para-aramid fiber has been gradually applied in the field of special paper and has become an important raw material for papermaking. [0003] Para-aramid paper is prepared from para-aramid chopped strands and para-aramid fibrids or pulp fibers in a certain ratio through a wet papermaking process....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/26D21H15/10
Inventor 陆赵情江明张美云
Owner SHAANXI UNIV OF SCI & TECH
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