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A kind of polypropylene nanofiber and preparation method thereof

A technology of nanofibers and polypropylene, applied in the direction of fiber chemical characteristics, rayon manufacturing, conjugated synthetic polymer rayon, etc., can solve the problem that the diameter of polypropylene fibers cannot be effectively controlled, the performance and strength of non-woven fabrics, and the deviation range Large and other problems, to achieve superior performance, small single fiber diameter, good filtering effect

Active Publication Date: 2021-04-16
TORAY FIBER RES INST(CHINA) CO LTD
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  • Abstract
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Problems solved by technology

[0004] Although the above two published patents have realized the fineness of the polypropylene fiber diameter, the diameter of the polypropylene fiber cannot be effectively controlled regardless of whether it is melt-blown or made into a masterbatch first, and the deviation range of the diameter CV% is limited. It is very large, generally more than 30%, which has a great influence on the performance and strength of the non-woven fabric made of the polypropylene fiber

Method used

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  • A kind of polypropylene nanofiber and preparation method thereof

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preparation example Construction

[0015] The invention also discloses a method for preparing polypropylene nanofibers. The method mainly includes the following steps: firstly, polypropylene is used as the island component, an alkali weight-reducing polymer is used as the sea component, and the composite composition of the sea island weight is 30 / 70 to 70 / 30 The sea-island composite fiber was prepared by melt-spinning on a spinning machine equipped with a distribution-type sea-island composite spinneret. The distribution type spinneret mainly includes a metering part, a distribution part and a discharge part, wherein the distribution part is composed of a plurality of plates, the thickness of each plate is about 0.2mm, and there are holes and grooves on the plate. By changing the number of plates The number of islands can be adjusted within the range of 100 to 1000. At the same time, when preparing the sea-island composite fiber, the diameter of the island is adjusted to be 200-1000 nanometers, and the distance...

Embodiment 1

[0040]The content of the hindered amine light stabilizer is 2.0wt. % masterbatch chips. Then the masterbatch is used as the island component, and the alkali-reduced polyester is used as the sea component. The island / sea weight ratio is 70 / 30, and the melt viscosity ratio of the island / sea is 1.5. Spinning is carried out on a spinning machine, and sea-island composite long fibers are obtained through melt spinning. It has been determined that the number of islands in a single fiber is 100, the shortest distance from the surface of the outermost island to the surface of the fiber is 3.0 μm, the cross-sectional shape of the island is circular, and the diameter deviation between islands is 15%. The composite long fiber is made into a non-woven fabric through a papermaking process after being short-fiberized, and a filter net with a fiber diameter of 1000 nm is obtained after the non-woven fabric is reduced in weight.

[0041] Formula 1.

Embodiment 2

[0043] The content of the hindered amine light stabilizer is 2.0wt. % masterbatch chips. Then the masterbatch is used as the island component, the alkali weight-reduced polyester is used as the sea component, the island / sea weight ratio is 70 / 30, and the melt viscosity ratio of the island / sea is 2.0. Spinning is carried out on a spinning machine, and sea-island composite long fibers are obtained through melt spinning. It has been determined that the number of islands in a single fiber is 500, the shortest distance from the surface of the outermost island to the surface of the fiber is 1.0 μm, the cross-sectional shape of the island is circular, and the diameter deviation between islands is 5.0%. The composite long fiber is made into a non-woven fabric through a papermaking process after being short-fiberized, and a filter net with a fiber diameter of 600nm is obtained after the weight reduction of the non-woven fabric.

[0044] Formula 1.

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Abstract

The invention discloses a polypropylene nanofiber and a preparation method of the fiber. The diameter of the polypropylene nanofiber is 200-1000 nanometers, and the deviation range CV% of the fiber diameter is 1%-20%. When preparing polypropylene nanofibers, the sea-island composite fiber is prepared by using polypropylene as the island component and the alkali weight-reducing polymer as the sea component. The number of islands on the cross-section of a single fiber of the sea-island composite fiber is 100 to 1000. The diameter of the islands is 200-1000 nanometers, the distance between the outermost island surface and the fiber surface is 0.3 μm-3.0 μm, and then the nanofibers are obtained through weight reduction. The diameter of the nanometer fiber of the invention is small and relatively uniform, and the non-woven fabric prepared by it has good filtering effect and superior performance.

Description

technical field [0001] The invention relates to a polypropylene nanofiber and a preparation method of the fiber. Background technique [0002] With the development of industrialization, environmental pollution, especially air pollution, is becoming more and more serious. Therefore, the use of air filtration equipment in daily life is increasing, and the performance requirements for polypropylene fiber, which is used as a filter material for air filtration equipment, are also increasing. [0003] In order to improve the filtering effect, the diameter of the polypropylene fiber is required to be as fine as possible, and it is best to reach the nanometer level. At present, there are two main processes for large-scale production of polypropylene fibers: melt spinning and melt blowing. For example, Chinese patent CN101665993A discloses an ultra-fine melt-blown non-woven fabric hybrid material, the melt-blown non-woven fabric prepared by it and its manufacturing method. The outl...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D01F8/06D01F8/14D01F1/10
Inventor 倪春健望月克彦
Owner TORAY FIBER RES INST(CHINA) CO LTD
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