Multifunctional composite melt blown nonwoven fabric and preparation method thereof

A melt-blown non-woven fabric, multi-functional technology, applied in the direction of non-woven fabrics, textiles and papermaking, single-component synthetic polymer rayon, etc., can solve the need to improve filtration efficiency, poor electret effect and charge stability And other problems, to achieve the effect of improving the electret effect and charge stability, good electrostatic electret effect, and prolonging the service life

Active Publication Date: 2021-12-07
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the polypropylene melt-blown non-woven fabrics prepared by the prior art still have the problems of poor electret effect and charge stability, and the filtration efficiency still needs to be improved.

Method used

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  • Multifunctional composite melt blown nonwoven fabric and preparation method thereof
  • Multifunctional composite melt blown nonwoven fabric and preparation method thereof
  • Multifunctional composite melt blown nonwoven fabric and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0031] A preparation method of the above-mentioned multifunctional composite melt-blown nonwoven fabric, comprising the following steps:

[0032] S1. Weigh polypropylene, initiator and fluorine-containing olefin monomer according to the mass ratio of 100:(0.5~10):(2~20), mix them uniformly, and then melt blend them in a twin-screw extruder to modify properties, to obtain fluorine-containing graft modified polypropylene melt-blown material; the initiator is one of dicumyl peroxide, benzoyl peroxide, and di-tert-butyl peroxide;

[0033] S2. Melt and mix polypropylene in a twin-screw extruder to obtain polypropylene melt-blown material;

[0034] S3. Perform double-layer melt blown on the fluorine-containing graft modified polypropylene melt blown material obtained in step S1 and the polypropylene melt blown material obtained in step S2 to obtain the multifunctional composite melt blown nonwoven fabric.

[0035]In the present invention, polypropylene is selected as the matrix mat...

Embodiment 1

[0041] A kind of multifunctional composite melt-blown non-woven fabric, is prepared through the following steps:

[0042] S1. Weigh polypropylene, benzoyl peroxide and trifluoroethyl methacrylate with a melt index of 1400g / 10min according to a mass ratio of 100:2:10, mix them uniformly, and melt them in a twin-screw extruder Blending modification (processing temperature is 180°C) to obtain fluorine-containing graft modified polypropylene melt-blown material;

[0043] S2. melting and mixing polypropylene with a melt index of 1150g / 10min in a twin-screw extruder to obtain a polypropylene melt-blown material (the melt index of the polypropylene melt-blown material is 1000g / 10min);

[0044] S3. The fluorine-containing graft modified polypropylene melt-blown material obtained in step S1 and the polypropylene melt-blown material obtained in step S2 are subjected to double-layer MM melt-blown to obtain the multifunctional composite melt-blown non-woven fabric .

[0045] Electret ch...

Embodiment 2-5

[0050] A kind of multifunctional composite melt-blown non-woven fabric, compared with Example 1, the difference is that in step S1, the quality ratio of polypropylene, benzoyl peroxide and trifluoroethyl methacrylate is as shown in Table 1 . Others are substantially the same as in Embodiment 1, and will not be repeated here.

[0051] Preparation conditions and filtration performance of table 1 embodiment 2-5

[0052]

[0053] As can be seen from Table 1, in Examples 2 and 3, under the same conditions of initiator content, with the increase of the content of trifluoroethyl methacrylate, the higher the surface electrostatic potential of polypropylene, the better the filtering effect of PM2.5 The better, the lower the filter piezoresistance and the smaller the rate of charge decay. Examples 4 and 5, under the same conditions of the content of functional monomer trifluoroethyl methacrylate, as the content of the initiator DCP increases, the surface electrostatic potential of ...

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Abstract

The invention provides a multifunctional composite melt blown nonwoven fabric and a preparation method thereof. Firstly, the principle of polypropylene modification reaction extrusion is used to mix the initiator, fluorine-containing olefin monomer and polypropylene according to a certain mass ratio, and then undergo melt grafting modification through a twin-screw extruder to prepare a high-strength Flowable modified polypropylene material. Then melt-blown grade polypropylene and modified polypropylene are subjected to double-layer melt-blown spinning and composite web laying to prepare a multifunctional composite melt-blown nonwoven fabric. The invention combines conventional polypropylene non-woven fabric with fluorine-containing graft modified polypropylene non-woven fabric through double-layer melt blown to obtain gradient electret filter material. The electret effect and charge stability are improved by adjusting the chain segment composition of the fluorine-containing graft-modified polypropylene. The non-woven fabric prepared by the invention has the advantages of good electrostatic electret effect, high air filtration efficiency, low pressure resistance and the like.

Description

technical field [0001] The invention relates to the technical field of non-woven filter materials, in particular to a multifunctional composite melt-blown non-woven fabric and a preparation method thereof. Background technique [0002] In recent years, the development of polymer chemical fiber production technology has enabled the production of HEPA and ULPA filters with electret fibers; materials used for electret air filters require excellent dielectric properties, such as high body resistance and surface resistance , High dielectric breakdown strength, low moisture absorption and air permeability, etc. Such materials are mainly organic electret materials based on high polymers, such as non-polar materials: polypropylene, polytetrafluoroethylene, hexafluoroethylene / polytetrafluoroethylene copolymer, etc.; polar materials or weak polarity Material: PTFE, polypropylene (blend) and polyester etc. [0003] Polypropylene electret electrostatic synthetic fiber filter material ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D04H1/56D04H1/544D04H1/559D01F6/06D01F6/30C08F255/02C08F220/24
CPCC08F255/02D01F6/06D01F6/30D04H1/544D04H1/559D04H1/56C08F220/24
Inventor 王栋刘开宇赵青华朱志敏
Owner WUHAN TEXTILE UNIV
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