Microporous polytetrafluoroethylene membrane for electronic communication sealing industry and preparation method for microporous polytetrafluoroethylene membrane
A technology of polytetrafluoroethylene and microporous membrane, which is applied in the field of sealing materials, can solve the problem of the difference in the size of micropores on the front and back of the membrane, and achieve the effect of preventing poisoning
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Embodiment 1
[0037] A preparation method for a polytetrafluoroethylene microporous membrane used in the electronic communication sealing industry, comprising the following technical steps:
[0038] (1) Mixing: Add ExxonMobil’s ISOPARK as a hydrocarbon extrusion aid to the PTFE resin powder labeled F106 produced by Daikin Chemicals in Japan, and the weight ratio of the two is 1:0.25 The ratio of the mixture is fully mixed, and it is left to stand at 50°C for 24 hours to form a material;
[0039] (2) Billet making: pre-press the material into a cylindrical billet of Φ120mm at 50°C;
[0040] (3) Extrusion: Place the cylindrical billet on the pusher, and push it into a round bar of Φ22mm at 55°C;
[0041] (4) Calendering: place the round bar on a calender, and calender it at 70°C to form an oil-containing base belt with a thickness of 150 microns;
[0042] (5) Longitudinal stretching after degreasing treatment: degrease the oil-containing base tape at 260°C, remove the extrusion aid, and per...
Embodiment 2
[0048] A preparation method for a polytetrafluoroethylene microporous membrane used in the electronic communication sealing industry, comprising the following technical steps:
[0049] (1) Mixing: Add ExxonMobil’s ISOPARK as a hydrocarbon extrusion aid to the PTFE resin powder labeled FD3309 produced by DuPont in the United States, and the ratio of the two is 1:0.28 by weight. Mix and stand at 50°C for 24 hours to form a material;
[0050] (2) Billet making: pre-press the material into a cylindrical billet of Φ120mm at 50°C;
[0051] (3) Extrusion: Place the cylindrical billet on a pusher and push it into a round bar of Φ20mm at 60°C;
[0052] (4) Calendering: place the round bar on a calender, and calender it at 70°C to form an oil-containing base belt with a thickness of 120 microns;
[0053] (5) Longitudinal stretching after degreasing treatment: degrease the oil-containing base tape at 280°C, remove the extrusion aid, and carry out the first longitudinal stretching, and ...
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