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Preparation and classification method of para-aramid pulp

A technology of para-aramid pulp and grading method, which is used in cellulose raw material pulping, textile and papermaking, papermaking and other directions, can solve the problem of wide distribution of pulp thickness, unstable pulp diameter and aspect ratio, and inability to guarantee Pulp quality meets the needs of downstream products and other issues to achieve the effect of reducing static electricity

Active Publication Date: 2014-10-01
烟台泰和兴材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese Patent Publication No. CN101250771A uses aramid waste to produce pulp, and CN1191397C uses aramid scraps to produce aramid pulp. The pulp in these two patents is not prepared by good quality aramid filaments, so there is no guarantee The quality of pulp meets the needs of downstream products
Yoon proposed in EP0104410 the low-temperature polycondensation method to directly prepare aramid pulp, but the polymerization solvent uses pyridine, which will endanger people's physical and mental health, and the obtained pulp has a wide distribution of thickness, and the diameter and aspect ratio of the pulp are unstable.

Method used

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  • Preparation and classification method of para-aramid pulp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Such as figure 1 As shown, the para-aramid filament is mechanically cut into short fibers with a length of 8 mm, and added to an aqueous solution of polyoxyethylene oleate with a mass concentration of 1% to form a uniform suspension with a mass concentration of short fibers of 2%. Liquid, through the high-consistency disc refiner for defrosting, interrupting and brooming, the refining time is 120min, adding antistatic agent stearylamine polyoxyethylene ether in the slurry, the mass concentration of antistatic agent is 1%, through papermaking Machine dehydration and drying to make cardboard with a dryness of 95%. The cardboard is opened by an opener to obtain para-aramid pulp. The opened pulp is classified by a cyclone separator, and the first-stage separator The diameter is 4m, the height is 7.8m, and the pressure is 5.5KPa. The diameter of the secondary separator is 2.5m, the height is 5m, and the pressure is 3.5KPa. The first stage cyclone separator adopts upper feedi...

Embodiment 2

[0021] Cut para-aramid filaments into short fibers with a length of 4 mm by mechanical cutting, and add them to an aqueous solution of 0.5% polyoxyethylene oleate to form a uniform suspension with a mass concentration of short fibers of 1%. The disc refiner is used for defrosting, interrupting and brooming. The refining time is 180min. Add antistatic agent stearylamine polyoxyethylene ether to the slurry. The mass concentration of antistatic agent is 0.5%. Dried to make a cardboard with a dryness of 94%. The cardboard is opened by an opener to obtain para-aramid pulp. The opened pulp is classified by a cyclone separator. The diameter of the primary separator is 4m. The height is 7m, the pressure is 5.5KPa, the diameter of the secondary separator is 2.5m, the height is 6m, and the pressure is 4KPa. After classification, the content of paper dust is reduced by 80%, and the content of fine fibers with a length of less than 0.1mm is reduced by 65%, resulting in an average length o...

Embodiment 3

[0023] Cut para-aramid filaments into short fibers with a length of 4 mm by mechanical cutting, and add them to an aqueous solution of fatty alcohol polyoxyethylene ether methyl silane with a mass concentration of 0.5% to form a uniform suspension with a mass concentration of short fibers of 1.5% Liquid, through the double-disk disc refiner to decompose, interrupt and broom, the refining time is 150min, add antistatic agent sorbitol in the slurry, the mass concentration of antistatic agent is 0.5%, dehydrate and dry through the paper machine The cardboard with a dryness of 94% is made, and the cardboard is opened by an opener to obtain para-aramid pulp. After opening, the pulp is classified by a cyclone separator. The diameter of the primary separator is 3m, and the height The diameter of the secondary separator is 3m, the height is 6m, and the pressure is 3.5KPa. The first-stage cyclone separator adopts upper feeding, and the second-stage cyclone separator adopts intermediate ...

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Abstract

The invention discloses a method for preparing and grading contrapuntal aramid pulp, which comprises the following steps of cutting contrapuntal aramid filament into short fibers, adding the short fibers into water containing dispersing agents to form suspension of the short fibers, then defibering, breaking and brooming the suspension of the short fibers to obtain serous fluid, adding antistatic agents into sizing agents, dewatering and drying the mixture to obtain a paper board with dryness degree of 92%-95%, opening the paper board to obtain the contrapuntal aramid pulp, and grading the opened contrapuntal aramid pulp through two-level cyclone separators, wherein the diameter of a first level cyclone separator is 3-4m, the height of the first level cyclone separator is 6-8m, the diameter of a second level cyclone separator is 2.5-3m, and the height of the second level cyclone separator is 5-6m. The method utilizes the contrapuntal aramid filament to serve as the raw material, utilizes a quantitative water control system to control the dryness degree of the paper board, and utilizes the cyclone separators to grade the opened contrapuntal aramid pulp, thereby reducing contents of fiber fines and paper scraps and obtaining the contrapuntal aramid pulp with narrow length distribution and stable quality.

Description

technical field [0001] The invention relates to a method for preparing and classifying para-aramid pulp. Background technique [0002] Para-aramid pulp (PPTA-pulp) is a newly developed differentiated variety of PPTA fiber in the past two decades. It is a high-temperature resistant and highly dispersible fibrillated PPTA fiber product. While having excellent physical and mechanical properties, it has rich hairiness, high aspect ratio, and large specific surface area (4-14m 2 / g) and other advantages, so as an ideal substitute for asbestos, it has been widely used in the fields of friction, sealing, and reinforcing materials. Pulp has been developed rapidly, and the market demand is increasing day by day, accounting for about 30% of the sales volume of PPTA fiber. [0003] At present, the preparation technologies of para-aramid pulp mainly include the concentrated sulfuric acid liquid crystal spinning and cutting method of PPTA and the low-temperature solution polycondensati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C3/22
Inventor 邱召明陈文建马千里
Owner 烟台泰和兴材料科技股份有限公司
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