Polytetrafluoroethylene bubble point film, and preparation method thereof

A polytetrafluoroethylene and bubble point technology, which is applied in the field of polytetrafluoroethylene bubble point film and its preparation, can solve the problem that the sterilization effect cannot be satisfied, and achieves excellent sterilization performance, good pore size stability, and is not easy to shrink and deform Effect

Active Publication Date: 2019-07-26
ZHEJIANG KERTICE HI TECH FLUOR MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent application number CN201410149632 proposes a preparation method of polytetrafluoroethylene bubble-point film. By mixing polytetrafluoroethylene resin and polystyrene resin, a bubble-point film with a pore size of 0.4-0.5 microns is obtained, which cannot meet the requirements of sterilization. Effect, generally the bubble point can play a role in the pore size of 0.2 microns

Method used

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  • Polytetrafluoroethylene bubble point film, and preparation method thereof

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Embodiment 1

[0031] A preparation method of polytetrafluoroethylene, comprising the following steps: mixing, curing, embryo pressing, pressing, calendering and biaxial stretching, and further comprising a heat setting step after biaxial stretching, and the heat setting temperature is 320° C., The time of heat setting is 30s, and the cooling rate of heat setting is 20°C / min; wherein, the mixing process is: adding polytetrafluoroethylene resin a and polytetrafluoroethylene resin b into the double cone mixer, First rotate clockwise for 10 minutes, then counterclockwise for 10 minutes, and the mixing temperature is 10 °C; the biaxial stretching process is: firstly, longitudinal stretching with a stretching ratio of 3 times is performed, and then transverse stretching with a stretching ratio of 5 times is carried out. ; Aging temperature of 60 ℃.

[0032] Use raw material 1 to mix.

Embodiment 2

[0034] A preparation method of polytetrafluoroethylene, comprising the following steps: mixing, curing, embryo pressing, pressing, calendering and biaxial stretching, and further comprising a heat setting step after the biaxial stretching, and the temperature of the heat setting is 340 DEG C, The time of heat setting is 60s, and the cooling rate of heat setting is 70°C / min; wherein, the mixing process is: adding polytetrafluoroethylene resin a and polytetrafluoroethylene resin b into the double cone mixer, Rotate clockwise for 30 minutes first, stand still for 5 minutes, then rotate counterclockwise for 30 minutes, and the mixing temperature is 20 °C; the biaxial stretching process is: firstly, longitudinal stretching with a stretching ratio of 10 times is carried out, and then a stretching ratio of 12 times is carried out. Transverse stretching; aging temperature is 90 ℃.

[0035] Use raw material 2 to mix.

Embodiment 3

[0037] A preparation method of polytetrafluoroethylene, comprising the following steps: mixing, curing, embryo pressing, pressing, calendering and biaxial stretching, and further comprising a heat setting step after biaxial stretching, and the temperature of the heat setting is 330 DEG C, The time of heat setting is 50s, and the cooling rate of heat setting is 50°C / min; wherein, the mixing process is: adding polytetrafluoroethylene resin a and polytetrafluoroethylene resin b into the double cone mixer, Rotate clockwise for 20 minutes first, stand still for 3 minutes and then rotate counterclockwise for 20 minutes, and the mixing temperature is 15 °C; the biaxial stretching process is: firstly, longitudinal stretching with a stretching ratio of 5 times is carried out, and then a stretching ratio of 8 times is carried out. Transverse stretching; aging temperature is 80 ℃.

[0038] Use raw material 3 to mix.

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Abstract

The invention belongs to the technical field of film, and especially relates to a polytetrafluoroethylene bubble point film, and a preparation method thereof. The raw material is polytetrafluoroethylene resin comprising polytetrafluoroethylene resin a with a molecular weight of 105 to 107 and polytetrafluoroethylene resin b with a molecular weight of 107 to 108, wherein the particle size ratio ofthe polytetrafluoroethylene resin a to the polytetrafluoroethylene resin b is controlled to be 95-105:100. The preparation method comprises a step of hot fixing after double direction stretching, thehot fixing temperature is controlled to be 320 to 340 DEG C, and hot fixing time is controlled to be 30 to 60s. The aperture of the obtained bubble point film is about 0.2<mu>m, aperture distributionis uniform, and the stability is high.

Description

technical field [0001] The invention relates to the technical field of films, in particular to a polytetrafluoroethylene bubble point film and a preparation method thereof. Background technique [0002] The production method of polytetrafluoroethylene (PTFE) film is complex, the process is long, and there are many influencing factors, so there are many problems in mass production of high-quality products. Molecular weight polymers have good strength and high porosity. However, the perfluorinated linear high molecular weight polymer has large particles, high melting point and high melt viscosity, and its film manufacturing method is an unconventional process method. Patent CN1193060A proposes that the expansion and shaping effect is better at 1000-1500 ° C. It is believed that the high temperature setting is more than ten times, the strength of the membrane is high, and the pore size is stable, but this ultra-high temperature expansion and shaping method is difficult to cont...

Claims

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Application Information

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IPC IPC(8): C08L27/18C08J5/18B29D7/01B29C55/14
CPCB29C55/143B29D7/01C08J5/18C08J2327/18C08J2427/18
Inventor 姜学梁王峰
Owner ZHEJIANG KERTICE HI TECH FLUOR MATERIAL
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