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ECTFE melt-blown film and preparation method thereof

A melt-blown and melt-based technology, which is applied in the field of membrane materials, can solve the problems of unsatisfactory filtration accuracy, unresolved technical problems, large pore size of melt-blown membranes, etc., and achieve high elongation at break and uniform pore size distribution , the effect of high tensile strength

Active Publication Date: 2021-05-28
ZHEJIANG RES INST OF CHEM IND CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The biggest technical problem of ECTFE melt-blown membrane is that the membrane pore size is large, and the filtration accuracy cannot meet the requirements; the processing temperature is high, the diameter of the prepared melt-blown filament is large (minimum 2 μm ~ 3 μm), the mechanical properties are poor, and the longitudinal fracture elongation is relatively large. The elongation rate is only about 5%
In the prior art, there is no relevant report to solve the above-mentioned technical problems

Method used

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  • ECTFE melt-blown film and preparation method thereof
  • ECTFE melt-blown film and preparation method thereof
  • ECTFE melt-blown film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] ECTFE resin (melt index: 600g / 10min, 2.16kg, 275°C) with a melting temperature of 195°C was melt-processed in a twin-screw extruder, and the melt-processing temperature was 200°C. The hot air temperature of the high-speed high-temperature airflow is 230°C, the hot air pressure is 0.1MPa, the temperature of the mesh roller is 30°C, the distance between the die lip and the mesh roller is 2cm, and the diameter of the obtained ECTFE ultrafine fiber is 1.0μm.

[0035] During hot-pressing, the hot-pressing temperature is 100°C, the hot-pressing pressure is 0.05MPa, and the hot-pressing time is 10s.

[0036] In the prepared melt-blown film, at least 75% of the melt-blown film has a pore size between 0.3 μm and 0.7 μm, and less than 10% of the melt-blown film has a pore size between 0.1 μm and 0.3 μm, and less than 10% The pore diameter of the melt blown film is between 0.7 μm and 1.0 μm, and the pore diameter of less than 5% of the melt blown film exceeds 0.1 μm to 1.0 μm.

...

Embodiment 2

[0039] The operation of this embodiment is the same as that of Example 1, except that the temperature of the mesh roller is 40° C., the distance between the die lip and the mesh roller is 1 cm, and the obtained ECTFE superfine fibers have a diameter of 0.5 μm.

[0040] During hot-pressing, the hot-pressing temperature is 100°C, the hot-pressing pressure is 0.05MPa, and the hot-pressing time is 10s. The pore diameter of at least 80% of the melt blown film is between 0.3 μm and 0.7 μm, the pore diameter of 10% of the melt blown film is between 0.1 μm and 0.3 μm, and the pore diameter of 5% of the melt blown film is between Between 0.7 μm and 1.0 μm, 5% of the melt-blown membranes have a pore diameter exceeding 0.1 μm to 1.0 μm. The longitudinal tensile strength of the prepared melt-blown film was 2.08 MPa, and the longitudinal elongation at break was 50%; the transverse tensile strength of the melt-blown film was 1.50 MPa, and the transverse elongation at break was 108%.

Embodiment 3

[0042] The operation of this embodiment is the same as that of Example 1, and the difference is that: the ECTFE resin (melt index is 600g / 10min, 2.16kg, 275°C) with a melting temperature of 180°C is melt-processed in a twin-screw extruder, and the melt-processing temperature is 185°C. The obtained ECTFE ultrafine fiber has a diameter of 0.4 μm.

[0043]The pore diameter of 85% of the prepared melt-blown film is between 0.3 μm and 0.7 μm, the pore diameter of less than 5% of the melt-blown film is between 0.1 μm and 0.3 μm, and less than 5% of the melt-blown film The pore diameter of the membrane is between 0.7 μm and 1.0 μm, and the pore diameter of less than 5% of the melt blown membrane exceeds 0.1 μm to 1.0 μm.

[0044] The longitudinal tensile strength of the prepared melt-blown film was 2.13 MPa, and the longitudinal elongation at break was 53%; the transverse tensile strength of the melt-blown film was 1.53 MPa, and the transverse elongation at break was 110%.

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Abstract

The invention discloses an ECTFE melt-blown film and a preparation method thereof. The melt-blown film is composed of superfine fibers with the diameter of 0.1 [mu] m-5 [mu] m; and the aperture of at least 60% of the melt-blown film is 0.3 [mu] m-0. 7 [mu] m, the aperture of less than 20% of the melt-blown film is 0.1 [mu] m-0. 3 [mu] m, and the aperture of less than 20% of the melt-blown film is 0.7 [mu] m-1. 0 [mu] m. The melt-blown film disclosed by the invention has the advantages of high tensile strength, high elongation at break, small average pore size, high filtering precision, suitability for high-temperature-resistant, acid-base-resistant and corrosion-resistant environments and the like.

Description

technical field [0001] The invention relates to the field of film materials, in particular to an ECTFE melt-blown film and a preparation method thereof. Background technique [0002] ECTFE, that is, ethylene-chlorotrifluoroethylene copolymer, is an alternating copolymer of chlorotrifluoroethylene and ethylene close to 1:1, which has the advantages of high mechanical strength, good heat resistance, good chemical resistance, and good weather resistance. The alkali resistance can reach pH=14, and the corrosion resistance of chemical reagents is equivalent to that of polytetrafluoroethylene. It is especially suitable for the separation environment of high temperature and high corrosion. It has broad application prospects in the separation field and is a potential ideal membrane material. [0003] Melt-blown non-woven technology is one of the polymer direct-forming methods, which is to subject the polymer melt extruded by the screw extruder to the extreme by blowing the high-spee...

Claims

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Application Information

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IPC IPC(8): D04H3/16D04H3/007D04H3/14D04H3/016D01F6/30D01F6/32
CPCD04H3/16D04H3/007D04H3/14D04H3/016D01F6/30D01F6/32
Inventor 刘慧吁苏云代哲振高林娜张艳中
Owner ZHEJIANG RES INST OF CHEM IND CO LTD
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