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A method for preparing aramid paper with para-aramid nanofibers

A technology of nanofibers and para-aramid fiber, applied in the direction of synthetic cellulose/non-cellulose material pulp/paper, fiber raw material treatment, papermaking, etc. Requirements for high-precision products, unstable PAP performance and other issues, to achieve good industrial application prospects, excellent mechanical properties and electrical insulation properties, and excellent uniformity

Active Publication Date: 2018-08-10
山东聚芳新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the thickness of PAP is generally tens to hundreds of microns (the thickness of some PAPs for special purposes is more than 100um), while the diameter of para-aramid short fibers is about 10um, and the main structural size of pulp and precipitated fibers is also several hundred Nanometer to several micrometers, once the slurry is unevenly dispersed, it is easy to cause uneven PAP, and then make the performance of PAP unstable
In addition, the addition of meta-aramid fibers and dispersing aids will also deteriorate the performance of PAP
Meta-aramid fiber has high hygroscopicity, which will cause the dimensional stability of PAP to decrease under high humidity, and it is difficult to meet the requirements of high-precision products.
The addition of dispersant, on the one hand, is not conducive to the dielectric properties and heat resistance of PAP, on the other hand, it will generate a large amount of waste water, resulting in environmental pollution and increased production costs.

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0019] The preparation method of the para-aramid fiber paper that the present invention proposes comprises the following steps:

[0020] (1) Preparation of slurry:

[0021] (1-1) Add the solvent N-methylpyrrolidone into the reactor, add the solubilizing salt while stirring under the protection of nitrogen, and heat to 80-100°C to completely dissolve the solubilizing salt to obtain the first solution. The dissolved salt is one or more mixtures in any proportion among calcium chloride, lithium chloride and magnesium chloride, and the mass concentration of the dissolved salt is (2-12)%; the first solution is reduced to 10-25°C, Add p-phenylenediamine and auxiliary agent in the first solution, obtain the second solution, the molar concentration of p-phenylenediamine in the second solution is (0.05-0.5) mol / L, auxiliary agent is polyoxyethylene ether polymer, The molecular weight of the polyoxyethylene ether polymer is 500-6000, and one or both ends of the polyoxyethylene ether po...

Embodiment 1

[0039] (1) Add 100L N-methylpyrrolidone to a 500L reactor, add 10kg of polymerization aid CaCl under nitrogen protection and stirring 2 , heated to 100°C to dissolve completely. Then the solution was lowered to 15°C with an ice-water bath, and then 4.326kg of p-phenylenediamine (PPD) and 8kg of polyethylene glycol (PEG) with a molecular weight of 2100 were added for dissolution. After the two were completely dissolved, the solution was further cooled to 0°C. Then add 8.178kg terephthaloyl chloride powder and high-speed stirring (500r / min) to carry out polymerization, keep ice-water bath in the polymerization process, keep system temperature no more than 70 ℃; Add 200L N-methylpyrrolidone / water (7:3, mass ratio) mixed solution into the reactor, stir rapidly for 5 minutes to break up the jelly, and form a uniform and stable para-aramid nanofiber dispersion;

[0040]The prepared nanofibers have a diameter of about 20nm and an average length of about 100um. In order to remove im...

Embodiment 2

[0047] (1) Add 100L of N-methylpyrrolidone into a 500L reactor, add 8kg of solubilizing salt LiCl under nitrogen protection and stirring, and heat to 100°C to completely dissolve it. Then use an ice-water bath to lower the system to 10°C, and then add 4.326kg of p-phenylenediamine (PPD) and 5kg of polyethylene glycol (PEG-DME) with a molecular weight of 2000 and methoxy double-capped to dissolve, and wait until the two are completely dissolved. Further cool down the solution to -5°C, add 8.160kg of terephthaloyl chloride melt (85°C) and high-speed stirring (1000r / min) for polymerization, keep an ice-water bath during the polymerization, and maintain the system temperature not exceeding 90°C; the above When the polycondensation reaction proceeds until the system forms a jelly body, stop stirring, add 200L of ethanol to the reactor, stir rapidly for 10 minutes to break the jelly body, and form a uniform and stable para-aramid nanofiber dispersion;

[0048] The prepared nanofiber...

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Abstract

The invention relates to a method for preparing aramid paper from para-aramid nanofibers, belonging to the technical fields of film materials and polymerization of polymers. The method comprises the following steps: blending dispersion liquid of the para-aramid nanofibers to an appropriate concentration; carrying out forming on a mesh so as to obtain wet paper; and then carrying out squeezing, drying and high-temperature calendering forming. Since the para-aramid nanofibers are extremely small in diameters, the prepared para-aramid paper is uniform and has stable performance; and the para-aramid nanofibers are extremely easy to disperse and needs no dispersing agent. The para-aramid paper prepared by using the method has excellent mechanical properties and electrical insulation performance. The method is simple in production process and greatly reduces production cost for the aramid paper. Since the para-aramid nanofibers are used as a raw material, the prepared aramid paper has excellent uniformity and does not contain any other component; and the method is simple in production process, low in cost and mild in conditions, is a novel method for preparation of the aramid paper and has good industrial application prospects.

Description

technical field [0001] The invention relates to a method for preparing aramid paper with para-aramid nanofibers, and belongs to the technical field of membrane materials and polymer polymerization. Background technique [0002] Para-aramid paper (hereinafter referred to as PAP) is a high-performance special polymer material, which has the advantages of high strength and high modulus, stable size, excellent electrical insulation, chemical resistance, light weight, etc. It is used as a structural material, insulating material, transparent Wave and filter materials are widely used in aerospace, military equipment, electronic appliances and other industries. [0003] At present, the raw materials used to prepare PAP are mainly para-aramid short fibers, pulp or precipitated fibers, and sometimes meta-aramid fibers or other thermoplastic resins are added as reinforcing agents. The process of papermaking is relatively complicated. Generally, the fiber needs to be beaten into a slu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H13/26D21F3/08D21F5/00D21F5/16
CPCD21F3/08D21F5/00D21F5/16D21H13/26
Inventor 庹新林
Owner 山东聚芳新材料股份有限公司
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