A kind of polytetrafluoroethylene bubble point film and preparation method thereof

A polytetrafluoroethylene and bubble point technology, applied in the field of polytetrafluoroethylene bubble point film and its preparation, can solve problems such as the inability to meet the sterilization effect, and achieve excellent sterilization performance, uniform pore size distribution, and high stability. Effect

Active Publication Date: 2021-10-15
ZHEJIANG KERTICE HI TECH FLUOR MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Examples

Experimental program
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Effect test

Embodiment 1

[0031] A preparation method of polytetrafluoroethylene, comprising the following steps: mixing materials, aging, compacting, pushing, calendering and biaxial stretching, and also includes a heat setting step after biaxial stretching, 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 and then counterclockwise for 10 minutes, the mixing temperature is 10°C; the bidirectional stretching process is: first carry out longitudinal stretching with a stretching ratio of 3 times, and then carry out transverse stretching with a stretching ratio of 5 times ; The curing temperature is 60°C.

[0032] Use raw material 1 to mix.

Embodiment 2

[0034] A method for preparing polytetrafluoroethylene, comprising the following steps: mixing materials, aging, compacting, pushing, calendering and biaxial stretching, and also includes a heat setting step after biaxial stretching, the heat setting temperature is 340°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, First rotate clockwise for 30 minutes, then rotate counterclockwise for 30 minutes after standing still for 5 minutes, the mixing temperature is 20°C; Transverse stretching; curing temperature is 90°C.

[0035] Use raw material 2 to mix.

Embodiment 3

[0037] A method for preparing polytetrafluoroethylene, comprising the following steps: mixing materials, aging, compacting, pushing, calendering, and biaxial stretching, and also includes a heat setting step after biaxial stretching, the heat setting temperature is 330°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, First rotate clockwise for 20 minutes, then rotate counterclockwise for 20 minutes after standing still for 3 minutes, the mixing temperature is 15 ° C; Transverse stretching; curing temperature is 80°C.

[0038] Use raw material 3 to mix.

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Abstract

The invention relates to the field of film technology, in particular to a polytetrafluoroethylene bubble point film and a preparation method thereof. The raw material is polytetrafluoroethylene resin, including 5 -10 7 PTFE resin a and a molecular weight of 10 7 -10 8 The polytetrafluoroethylene resin b, the particle diameter ratio of the polytetrafluoroethylene resin a and the polytetrafluoroethylene resin b is 95‑105:100, and the heat setting step after biaxial stretching is included during preparation, and the temperature of heat setting The temperature is 320‑340°C, and the heat setting time is 30‑60s. The pore size of the bubble point membrane obtained by the invention is about 0.2 microns, the pore size distribution is uniform, and the stability is high.

Description

technical field [0001] The invention relates to the field of film technology, in particular to a polytetrafluoroethylene bubble point film and a preparation method thereof. Background technique [0002] The production method of polytetrafluoroethylene (PTFE) film is complicated, the process is long, and there are many influencing factors. Therefore, there are many problems in mass production of high-quality products. Low molecular weight PTFE has low strength, small opening ratio of stretching, and high The molecular weight polymer has 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. Patent CN1193060A proposes that the effect of expansion and setting at 1000-1500°C is better. It is believed that the high-temperature setting is more than ten times, the strength of the membrane is high, and the pore ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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