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Short fiber with microfiber structure, filter felt, and manufacturing method of filter felt

A technology of microfiber structure and short fiber, which is applied in the direction of filtration and separation, fiber treatment, separation methods, etc., can solve the problems that it is difficult to meet the requirements of 2.5 micron dust filtration, the service life is not enough, and it is easy to fall off, so as to improve the control of air pollution Ability, improve filtering accuracy, increase the effect of collision probability

Active Publication Date: 2013-10-30
SHANGHAI BAIBANG MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as the country's requirements for air quality management further increase, if the monitoring requirements for PM2.5 indicators are introduced, it is difficult to meet the dust filtration requirements of 2.5 microns by using conventional fibers to prepare filter materials
Although the technology of film-coated filter material is available now, during the use of film-coated filter material, the filter bag is repeatedly shaken and washed repeatedly, which is very easy to fall off, and the service life is far less than that of non-film-coated filter material; at the same time, the wind resistance of the film-coated filter material is improved. , a large energy consumption in the dust removal process
[0004] In the prior art, aramid pulp has a microfibrillated structure, see the preparation method and product of para-aramid pulp of Yantai Spandex Co., Ltd. (Chinese invention patent application number: 200810225082.4), Sinopec Yizheng Chemical Fiber Co., Ltd. The method of preparing para-aramid pulp from para-aramid waste chopped fibers of the company and South China University of Technology (China Invention Patent Application No.: 200810244770.5), the preparation method of para-aramid pulp of Donghua University (China Invention patent application number: 02138112.7), a method for producing aramid pulp from aramid waste by Shanghai Yiji Technology Co., Ltd. (Chinese invention patent application number: 200810035456.6) and a manufacturing method of aramid pulp (Chinese invention patent application No.: 03129083.3), etc. Although the Schobau degree of these pulps can reach 25SR to 40SR, the length of these pulps is extremely short, generally only 0.1 to 5 mm, and they are usually used as fillers for friction and seals, and cannot be used for carding. Formed into a filter felt

Method used

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  • Short fiber with microfiber structure, filter felt, and manufacturing method of filter felt
  • Short fiber with microfiber structure, filter felt, and manufacturing method of filter felt
  • Short fiber with microfiber structure, filter felt, and manufacturing method of filter felt

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Cutting fiber:

[0047] Using the 1600-denier para-aramid filament coil of the Kevlar 29 brand produced by DuPont, 50 coils are plied to form a 80,000-denier tow, and then cut with a guillotine cutter to form a length of 90 mm. of short fibers.

[0048] (2) Preparation of expansion aids:

[0049] In the pretreatment still, 75 kilograms of dioctyl phthalates are dissolved in 425 kilograms of ethanol, stir and mix uniformly, prepare bulking aid, the mass percent of described dioctyl phthalates in ethanol solution is 15%.

[0050] (3) Dipping treatment

[0051] Take by weighing 50 kilograms of cut short fibers and place them in the pretreatment kettle with 500 kilograms of expansion aids, after stirring evenly, soak for 2 hours at normal temperature in the pretreatment kettle, remove the oil agent on the fiber surface, and make The fiber swells, making the structure of the fiber loose. Then take out the short fibers loosened by swelling and wash them with pure wat...

Embodiment 2

[0060] (1) Cutting fiber:

[0061] The 1600-denier para-aramid filament rolls produced by Yantai Taihe Co., Ltd. were used to ply 50 filament rolls to form 80,000-denier tows, which were then cut with a guillotine cutter to form short fibers of 90 mm.

[0062] (2) Preparation of expansion aids:

[0063] In the pretreatment still, 75 kilograms of dioctyl phthalates are dissolved in 425 kilograms of ethanol, stir and mix uniformly, prepare bulking aid, the mass percent of described dioctyl phthalates in ethanol solution is 15%.

[0064] (3) Dipping treatment

[0065] Take by weighing 50 kilograms of cut short fibers and place them in the pretreatment kettle with 500 kilograms of expansion aids, after stirring evenly, soak for 2 hours at normal temperature in the pretreatment kettle, remove the oil agent on the fiber surface, and make The fiber swells, making the structure of the fiber loose. Then take out the short fibers loosened by swelling and wash them with pure water. ...

Embodiment 3

[0072] With the finished product of a kind of para-aramid short fiber containing microfiber structure obtained in Example 2, the short fiber mass is opened, and then the short fiber after opening is made into a homogeneous mixture, using standard carding and crossing Winding equipment that converts these staple fibers into cross-lapped fine mats that are roughed or slightly reinforced on a standard needle loom, two or more sheets of fine mats are combined, and needled on both sides to produce the resulting The filter felt, the weight of the filter felt is 450g / m 2 .

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Abstract

The invention relates to a short fiber with a microfiber structure, a filter felt, and a manufacturing method of the filter felt. The short fiber is para-position aromatic polyamide fiber with the Schopper degree of 15-25 SR and the length of 30mm-70mm. After the fiber is independently used or mixed with one of other heat-resisting fibers or a mixture of the heat-resisting fibers, the filter felt product with high filtering precision is manufactured. The filter felt has high filtering precision, and can be used for removing atmospheric dust with the level of 2.5 microns.

Description

technical field [0001] The invention relates to a fiber used for filter materials and a preparation method thereof, in particular to a short fiber containing a microfiber structure and a preparation method thereof. The invention also relates to a filter felt made of short fibers containing a microfibrous structure and its preparation method. Background technique [0002] Para-aramid fiber, chemical name: poly-p-phenylene terephthalamide fiber, referred to as aramid 1414 fiber or para-aramid fiber, poly-p-phenylene terephthalamide polymer is spun by liquid crystal A high-strength and high-temperature-resistant fiber filament is obtained, which can withstand an operating temperature of 200°C under dry conditions. The fibril structure is hidden in its fiber structure, and the commercially available fiber is a fiber with a round cross section and a very smooth surface, and the diameter of the fiber is 10 to 30 microns. [0003] At present, the filter materials selected for hig...

Claims

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Application Information

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IPC IPC(8): D06M13/224D01F6/90D04H1/4382D04H1/4334D04H1/46D04H1/492B01D39/16
Inventor 钱寒冰华旻峰陈利
Owner SHANGHAI BAIBANG MATERIAL TECH
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