Preparation method of pure p-aramid paper

A technology of para-aramid paper and para-aramid fiber, which is applied in the field of preparation of pure para-aramid paper, and can solve problems such as unresolved concentrated sulfuric acid corrosion equipment, increased recovery of dilute sulfuric acid, and dimensional stability problems, etc. , to achieve the effect of eliminating the increased burden of sewage treatment, avoiding corrosion problems and complex problems of dilute sulfuric acid recovery, and eliminating expensive costs

Inactive Publication Date: 2012-06-27
YANTAI METASTAR SPECIAL PAPER +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Meta-aramid has high hygroscopicity, which leads to problems in dimensional stability under high humidity, and it is difficult to meet the requirements of high-precision products.
Dispersion aids are expensive. If dispersants are added during the preparation process, the sewage treatment procedures will be complicated, and the presence of dispersants will affect the temperature resistance of paper.
In CN1710196A, the para-aramid concentrated sulfuric acid solution is coated on the fiber paper, and then the fiber paper is fully impregnated with the effect of pressure. This process does not solve the corrosion equipment problem of concentrated sulfuric acid, and increases the recycling of dilute sulfuric acid, making papermaking The process is more complicated

Method used

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preparation example Construction

[0036] The preparation of para-aramid fibrids can adopt the following method: NMP (N-methylpyrrolidone), CaCl 2 and AlCl 3 Mix to make NMP-CaCl 2 -AlCl 3 Solvent, under the protection of nitrogen, add p-phenylenediamine to dissolve, add terephthaloyl dichloride at 5°C for pre-condensation reaction, the molar ratio of p-phenylenediamine and terephthaloyl chloride in the pre-condensation reaction is 1:0.6; pre-condensation After the reaction, add terephthaloyl chloride and stir vigorously to carry out polycondensation reaction. The molar ratio of terephthaloyl chloride added in the polycondensation reaction to p-phenylenediamine in the precondensation reaction is 1:0.4. Stop stirring when colloids are produced during the reaction. , matured at 50-80°C in a nitrogen atmosphere; the cured colloid solution and para-aramid pulp suspension enter a precipitator with a rotation speed of 1000-3000rpm for precipitation, and after precipitation, wash, beat, dehydrate and dry to obtain p...

Embodiment 1

[0044] (1) Add 0.4 parts of para-aramid chopped fibers with a length of 6 mm in 100 parts of water, and mechanically disperse the mixed solution for 10 minutes with a pulper; then add 100 parts of water and continue to disperse with a pulper for 5 minutes;

[0045] (2) Add 0.4 parts of para-aramid precipitated fibers with a beating degree of 35°SR to 40 parts of water, and use a pulper to mechanically disperse the mixed liquid for 5 minutes; then add 40 parts of water and continue to disperse with a pulper for 5 minutes ;

[0046] (3) Add 1.2 parts of para-aramid pulp with a beating degree of 55°SR to 300 parts of water, and use a pulper to mechanically disperse the mixed solution for 20 minutes; then add 300 parts of water and continue to disperse with a pulper for 5 minutes;

[0047] (4) mixing and stirring the above three kinds of slurry;

[0048] (5) Select the inclined wire forming technology of the inclined wire former, and screen the fine slurry with a pressure screen ...

Embodiment 2

[0052] (1) Add 1.0 parts of para-aramid chopped fibers with a length of 6mm in 100 parts of water, and mechanically disperse the mixed solution for 10 minutes with a pulper; then add 100 parts of water and continue to disperse with a pulper for 5 minutes;

[0053] (2) Add 3.0 parts of para-aramid precipitated fibers with a beating degree of 35°SR to 200 parts of water, and use a pulper to mechanically disperse the mixed solution for 15 minutes; then add 200 parts of water and continue to disperse with a pulper for 5 minutes ;

[0054] (3) Add 1.0 part of para-aramid pulp with a beating degree of 45°SR to 100 parts of water, and mechanically disperse the mixed solution for 20 minutes with a pulper; then add 100 parts of water and continue to disperse with a pulper for 5 minutes;

[0055] (4) mixing and stirring the above three kinds of slurry;

[0056] (5) Select the inclined wire forming technology of the inclined wire former, and screen the fine slurry with a pressure screen...

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Abstract

The invention relates to a preparation method of pure p-aramid paper. The preparation method of the pure p-aramid paper comprises the following steps of 1, respectively preparing p-aramid chopped fiber pulp, p-aramid fibrid pulp and p-aramid pulp, and mixing the p-aramid chopped fiber pulp, the p-aramid fibrid pulp and the p-aramid pulp, 2, approaching flows of the mixed pulp onto a net for molding, 3, carrying out squeezing and drying, and 4, carrying out high-temperature press-polish molding. The preparation method of the pure p-aramid paper has the advantages that p-aramid fibrids are utilized as bonding materials of the pure p-aramid paper so that interface affinity of fibers is improved and fiber paper mechanical properties of tensile strength, tearing strength and wear resistance are improved; p-aramid pulp has a high specific surface area so that a hydrogen bond binding capacity of fibers is improved and the pure p-aramid paper having high density, high stiffness and high strength is obtained; and in a preparation process, concentrated sulfuric acid is not needed so that the problems of equipment corrosion and dilute sulphuric acid recovery complexity are solved.

Description

technical field [0001] The invention relates to the technical field of synthetic fiber paper manufacture, in particular to a preparation method of pure para-aramid paper. Background technique [0002] Para-aramid paper has the advantages of high strength, high modulus, excellent dielectric properties, excellent solvent resistance and thermal dimensional stability, and light weight. It can be used as structural materials, insulating materials, wave-transmitting and filtering materials, and is widely used in Aerospace, transportation, electronics and other industries. [0003] Chinese patent application CN1884692A uses para-aramid chopped fibers and meta-aramid precipitated fibers that have been processed, and uses the method of adding dispersant to prepare insulating paper. The softness of the fibers is improved through a special beating process, and the limit frame is increased. Bonding force, and a special heat-pressing treatment on the aramid base paper, which greatly imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21H13/26
Inventor 邱召明马千里王志新孙静孙岩磊
Owner YANTAI METASTAR SPECIAL PAPER
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