A kind of preparation method of polyvinylidene fluoride nanofiber non-woven fabric
A technology of polyvinylidene fluoride and nanofibers, which is applied in the direction of non-woven fabrics, textiles and papermaking, and conjugated synthetic polymer artificial filaments, etc. It can solve the problems of unfavorable spinneret draw ratio, high melt viscosity, and fiber-forming properties Inadequate problems, to achieve the effect of simple and efficient preparation method, simple preparation method and convenient actual production
Active Publication Date: 2020-11-13
SICHUAN UNIV
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Problems solved by technology
However, the preparation of polyvinylidene fluoride nanofiber non-woven fabrics by meltblown method is subject to certain restrictions (Journal of Applied Polymer Science, 2013, 129: 2699-2706; Journal of Applied Polymer Science, 2007, 106: 1793-1799; Science, 2011, 120:21-35)
On the one hand, the diameter of the fibers obtained by the melt blown method is relatively thick, mostly between 2-4 μm, which is mainly due to the high viscosity of the melt and the difficulty of jet flow. The melt is prone to a large temperature drop when it leaves the die, and the jet solidifies; On the one hand, polyvinylidene fluoride is different from polymer materials such as polyethylene and polypropylene. There is fluorine element in its molecular chain, and its fiber-forming performance is poor, which is not conducive to the improvement of spinning draw ratio, and it is easy to break ( Marcomolecules, 1999, 32:8121-8132)
Method used
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Embodiment 1-40
[0040] (1) Raw material drying: fully dry polyvinylidene fluoride and water-soluble polyethylene oxide. The mass ratio of polyvinylidene fluoride and polyoxyethylene is shown in Table 1.
[0041] (2) Polyvinylidene fluoride / water-soluble polyethylene oxide mixed pellets: The blended raw materials of polyvinylidene fluoride and water-soluble polyethylene oxide dried in step (1) are melted and extruded through a twin-screw granulator, twin-screw The temperature range of the extruder from the feeding port to the die is 130-230℃, the screw speed is 60-300r / min, and then the polyvinylidene fluoride / water-soluble polyethylene oxide mixed pellets are obtained through granulation;
[0042] (3) Extrusion-Hot Stretching: Place the mixed pellets in step (2) in a single-screw extruder, the temperature range from the feeding port to the die of the single-screw extruder is 130-230℃, and the screw speed is 60-300r / min. Then it is extruded through a slit orifice, and the blending spline is given...
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Abstract
The invention discloses a preparation method of a polyvinylidene fluoride nanofiber nonwoven fabric. The preparation method comprises the following steps: (1) drying raw materials; (2) preparing polyvinylidene fluoride / water-soluble polyoxyethylene mixed granules with a twin-screw granulator; (3) performing slit extrusion-hot stretching on the mixed granules with a single-screw extruder to preparepolyvinylidene fluoride / water-soluble polyoxyethylene splines; (4) removing a water-soluble polyoxyethylene matrix phase; and (5) filtering, pressing and drying the remaining polyvinylidene fluoridefibers to obtain the polyvinylidene fluoride nanofiber nonwoven fabric. The invention has beneficial effects that the prepared polyvinylidene fluoride fibers have a diameter range of 50-2000 nm; the preparation method is efficient, simple in process, able to be realized by traditional polymer processing, and easy to realize mass production; no organic solvent is needed in a preparation process; and washing liquid can be recycled by solvent evaporation to achieve recycling and environmental protection.
Description
Technical field [0001] The present invention relates to the field of micro-nano fibers and their preparation, in particular to a method for preparing polyvinylidene fluoride nanofiber non-woven fabrics by granulating incompatible blends, extruding-heat stretching, and removing the matrix by water And other steps to prepare. Background technique [0002] Nanofiber non-woven fabric has the advantages of small basis weight, large specific surface area, high porosity, small pore size and easy functionalization of the surface. It has a wide range of applications in the field of liquid and air filtration (Journal of Membrane Science, 2006,281:581- 586). Polyvinylidene fluoride is a crystalline fluoropolymer material with good thermal and chemical stability, high mechanical strength and corrosion resistance. Polyvinylidene fluoride fiber non-woven fabric is widely used in the field of membrane separation. Especially suitable for the filtration of organic solvent systems (Journal of Me...
Claims
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IPC IPC(8): D01F8/16D01F8/10D01F11/06D04H3/007
CPCD01F8/10D01F8/16D01F11/06D04H3/007
Inventor 钟淦基任嘉怡李越李忠明
Owner SICHUAN UNIV