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A kind of ectfe meltblown 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: 2022-08-05
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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  • A kind of ectfe meltblown film and preparation method thereof
  • A kind of ectfe meltblown film and preparation method thereof
  • A kind of ectfe meltblown film and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0035] During hot pressing, the hot pressing temperature was 100°C, the hot pressing pressure was 0.05 MPa, and the hot pressing time was 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 size of the meltblown film is between 0.7 μm and 1.0 μm, and the pore size of the meltblown film less than 5% exceeds 0.1 μm to 1.0 μ...

Embodiment 2

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

[0040] During hot pressing, the hot pressing temperature was 100°C, the hot pressing pressure was 0.05 MPa, and the hot pressing time was 10s. At least 80% of the meltblown film has a pore size between 0.3 μm and 0.7 μm, 10% of the meltblown film has a pore size between 0.1 μm and 0.3 μm, and 5% of the meltblown film has a pore size between 0.3 μm and 0.7 μm. Between 0.7 μm and 1.0 μm, the pore size of 5% of the meltblown film exceeds 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 example is the same as that of Example 1, except that the ECTFE resin with a melting temperature of 180°C (melt index of 600g / 10min, 2.16kg, 275°C) was melt-processed in a twin-screw extruder, and the melt-processing temperature is 185°C. The obtained ECTFE ultrafine fibers had a diameter of 0.4 μm.

[0043]The pore size of 85% of the meltblown films prepared by the preparation is between 0.3 μm and 0.7 μm, the pore size of less than 5% of the meltblown films is between 0.1 μm and 0.3 μm, and the pore size of less than 5% of the meltblown films is between 0.1 μm and 0.3 μm. The pore size of the membrane is between 0.7 μm and 1.0 μm, and the pore size of the meltblown film less than 5% 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 ...

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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 ultrafine fibers with a diameter of 0.1 μm to 5 μm, and at least 60% of the melt-blown film has a pore size of 0.3 μm to 0.7 μm. In between, the pore size of less than 20% of the meltblown film is between 0.1 μm and 0.3 μm, and the pore size of less than 20% of the meltblown film is between 0.7 μm and 1.0 μm. The melt-blown film of the present invention has the advantages of high tensile strength, high elongation at break, small average pore size, high filtration precision, and is suitable for high temperature resistance, acid and alkali resistance and corrosion resistance environment.

Description

technical field [0001] The invention relates to the field of film materials, in particular to an ECTFE meltblown film and a preparation method thereof. Background technique [0002] ECTFE, namely ethylene-chlorotrifluoroethylene copolymer, is an alternating copolymer of chlorotrifluoroethylene and ethylene close to 1:1. It has the advantages of high mechanical strength, good heat resistance, chemical resistance, and 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 high temperature and high corrosion separation environments. It has broad application prospects in the field of separation and is a potential ideal membrane material. [0003] Melt-blown nonwoven technology is one of the direct polymer network forming methods, which is to subject the high-speed polymer melt extruded by a screw extruder to extreme high-speed and high-temperature...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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