Composite nanofiber membrane and preparation method thereof

A technology of composite nanofibers and nanofiber membranes, applied in fiber processing, cellulose/protein conjugated artificial filaments, melt spinning, etc., can solve the mechanical properties of filter materials The stability of the interface between the nanofiber matrix and the non-woven fabric base It has not been greatly improved, the strength of nanofibers has not been greatly improved, and the electrospinning process is not suitable for mass production, etc., to achieve the effect of solving the problem of insufficient interfacial bonding, excellent mechanical strength, and improved mechanical strength

Active Publication Date: 2020-07-28
WUHAN TEXTILE UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the disadvantage of this method is that the mechanical properties of the filter material and the interface stability between the nanofiber matrix and the non-woven fabric base have not been greatly improved.
However, the disadvantage of this method is that the strength of nanofibers has not been greatly improved, and the electrospinning process is not suitable for mass production, which limits its application range.

Method used

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  • Composite nanofiber membrane and preparation method thereof
  • Composite nanofiber membrane and preparation method thereof
  • Composite nanofiber membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] The invention provides a method for preparing a composite nanofiber membrane, comprising the following steps:

[0034] S1. Preparation of the base layer of composite non-woven fabric: according to a predetermined ratio, the thermoplastic polymer masterbatch and the vinyl alcohol-ethylene copolymer masterbatch are subjected to two-component melt spinning to obtain a two-component composite fiber; then, the two-component The component composite fiber is processed by fiber forming to prepare the composite non-woven fabric base layer;

[0035] S2. Preparation of PVA-co-PE nanofibers: blend vinyl alcohol-ethylene copolymer masterbatch and cellulose acetate butyrate masterbatch according to predetermined mass ratio to obtain mixed masterbatch, melt blend and spin the mixed masterbatch , preparing PVA-co-PE / CAB composite nanofibers; extracting the PVA-co-PE / CAB composite nanofibers with acetone to obtain PVA-co-PE nanofibers;

[0036] S3. Preparation of composite nanofiber me...

Embodiment 1

[0049] Preparation method of composite nanofiber membrane:

[0050] S1. Preparation of composite non-woven fabric base layer: The thermoplastic polymer PE masterbatch and vinyl alcohol-ethylene copolymer masterbatch with a mass ratio of 50%:50% are respectively subjected to two-component melt spinning through a screw extruder to prepare A melt-blown composite non-woven base layer with a skin-core structure is obtained; wherein, the skin layer is a vinyl alcohol-ethylene copolymer, and the core layer is a thermoplastic polymer.

[0051] S2. Preparation of PVA-co-PE nanofibers: Blend vinyl alcohol-ethylene copolymer masterbatches and cellulose acetate butyrate masterbatches in a mass ratio of 20:80, dry to obtain mixed masterbatches, and mix the The masterbatch is poured into the screw extruder for melt blending and spinning to prepare PVA-co-PE / CAB composite nanofibers, wherein the temperatures in the first to sixth zones of the twin-screw extruder are respectively set to 160, ...

Embodiment 2-5

[0057] The difference from Embodiment 1 lies in that the setting of the hot-pressing temperature in step S3 is different, and other steps are the same as in Embodiment 1, which will not be repeated here.

[0058] Example Hot pressing temperature (℃) Breaking strength (N / 5cm) Peel strength (KN / m) Example 1 150 210 3.0 Example 2 160 213 3.4 Example 3 170 216 3.6 Example 4 180 220 3.9 Example 5 210 224 4.5

[0059] Effect of hot pressing temperature on the strength of composite nanofiber membrane:

[0060] Under other conditions being the same, with the increase of hot pressing temperature, the more the PVA-co-PE part in the nanofiber layer and the non-woven fabric base layer is melted, and the contact between the nanofiber layer and the base layer is higher after hot pressing. Tight, so the higher the bonding strength, and further, the overall strength of the composite membrane is also enhanced.

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Abstract

The invention provides a composite nanofiber membrane and a preparation method thereof. Firstly, two-component melt spinning is conducted on thermoplastic polymer masterbatches and ethanol-ethylene polymer masterbatches to prepare two-component composite fiber of a shaped structure, and molding is conducted to obtain a composite non-woven base layer; then, ethanol-ethylene polymer masterbatches and cellulose acetate butyrate masterbatches are blended, and PVA-co-PE nanofiber is obtained by a molten extrusion phase separation method; and finally, the PVA-co-PE nanofiber is prepared into a suspension, the suspension is preliminarily composited with the composite non-woven base layer through air atomization, hot pressing is carried out, and the composite nanofiber membrane is obtained. According to the method, polymer materials of a two-layer structure in a composite nanofiber membrane structure adopt the same material for hot-pressing adhesion, the prepared composite nanofiber membrane has excellent mechanical strength, the interface bonding stability of the two-layer structure is high, the adhesion fastness is high, and separation is not easy to occur.

Description

technical field [0001] The invention relates to the field of nanofiber membrane preparation, in particular to a composite nanofiber membrane and a preparation method thereof. Background technique [0002] With the rapid development of the economy, industries such as metallurgy, steel, electric power and cement discharge a large number of fine particles into the atmosphere, causing serious air pollution. Fine particles have the characteristics of small particle size, carrying a large amount of toxic substances in the atmosphere for a long time, and long transportation distances, and become the primary pollutants that endanger human beings. Among them, aerosol particles with a diameter of less than 2.5 μm can not only cause various respiratory diseases in the human body, but also various cardiovascular and cerebrovascular diseases, and even heart failure and cor pulmonale. [0003] Nanofibers have the characteristics of small pore size, large specific surface area, and high p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H3/007D04H3/013D04H3/018D04H3/02D04H3/147D04H3/011D04H3/016D01F8/06D01F8/10D01F8/02D06M17/00D01D5/08D01D5/34D01D5/32D01D5/30
CPCD04H3/007D04H3/013D04H3/018D04H3/02D04H3/147D04H3/011D04H3/016D01F8/06D01F8/10D01F8/02D06M17/00D01D5/08D01D5/34D01D5/32D01D5/30
Inventor 王栋郭启浩刘轲赵青华李沐芳
Owner WUHAN TEXTILE UNIV
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