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Production of aromatic copolymide fiber dissolving pulp

A technology of aramid pulp and manufacturing method, applied in the field of high polymers, to achieve the effect of increasing the specific surface area

Inactive Publication Date: 2005-03-02
上海依极科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the above disadvantages, to design a new method for producing aramid pulp that reduces the pollution of three wastes and can make full use of aramid fiber leftovers

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0023] Example 1: In step 1, arrange 500 grams of aramid fiber scraps into cloth pieces with a width of 50 mm and a length of 50 cm according to size and shape, and then cut them into cloth strips with a width of 2 mm and a length of 50 cm with scissors. Step 2, put the cloth strip into a mechanical cutting machine, and cut it into 5mm (2×5mm small pieces) cloth pieces. Step 3, add small pieces of cloth to a tank filled with 200kg of water to disperse, pass through a single-disk mill, and beat for 300s to obtain a pulp-like stock solution, and adjust its concentration to 2.0%. In step 4, the stock solution with a concentration of 2.0% is passed through a trough-type beater for 2.5 hours to obtain a deflagged pulp solution. Step 5, the slurry is centrifugally dehydrated and dried to obtain an aramid pulp product with a specific surface area of ​​6M 2 / g, the average length is 2.1mm, and the logarithmic ratio viscosity is 5.1.

example 2

[0024] Example 2: With 500 grams of aramid fiber scraps, using the preparation steps of Example 1, cut the scraps of raw materials into 2×10mm cloth pieces, add them to disperse in a tank with 200kg of water, enter the single-disc mill, and beat for 300s to obtain The pulp-like stock solution, the concentration of which is 1.5%, is then passed through a trough beater, and the dissolving time is 5 hours. After drying, the specific surface area of ​​aramid pulp is 5.2M 2 / g, the average length is 2.4mm, and the logarithmic ratio viscosity is 4.6.

example 3

[0025] Example 3: Cut 500 grams of aramid fiber corner material into 5×5 mm cloth pieces by the procedure of Example 1, add them to a tank with 200 kg of water and disperse them, and beat them through a disc mill for 600 seconds to obtain a pulp-like stock solution , the concentration of which is 1.0%, and then passed through a trough beater, and the time of defrosting is 3 hours. After drying, the specific surface area of ​​aramid pulp is 6.5M 2 / g, the average length is 2.0mm, and the logarithmic ratio viscosity is 5.1.

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Abstract

A process for preparing the aramid fiber pulp features that the leftover of aramid fibre is physically treated to become microfibrils with large specific surface area. It can be used as friction material, sealing material and filler.

Description

Technical field: [0001] The invention belongs to the technical field of high polymers. It specifically relates to a method for manufacturing aramid pulp by using aramid fiber scraps as raw materials. Background technique: [0002] Aramid pulp is a kind of aramid commercial product of DuPont Company of the United States and Teijin Twaron Company of the Netherlands abroad. Aramid pulp products are obtained through monomer polymerization, spinning, winding and bundling, cutting, and grinding. The commercial production method of aramid pulp (such as U.S. Patent No. 3,767,756) needs to polymerize monomers into polymers, dissolve them in concentrated sulfuric acid to make polymer liquid crystal spinning solutions, and form them by dry and wet spinning, winding and cutting , and then beating and kowling and other process steps, the process flow is long, solvent recovery and special spinning equipment are required, so the cost is expensive. In recent years, aramid pulp has also be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B29B17/00C08J11/06D01F13/00
CPCY02P70/62Y02W30/62
Inventor 王曙中周助胜
Owner 上海依极科技有限公司
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