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A biaxially stretched porous expanded polytetrafluoroethylene expanded hollow tubular membrane and its preparation method
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A polytetrafluoroethylene, two-way stretching technology, applied in the direction of tubular objects, other household appliances, household appliances, etc., can solve the problems of insufficient transverse strength and low pore pressure, and achieve light weight, strong corrosion resistance, and environmental resistance Variation excellent effect
Inactive Publication Date: 2016-08-17
湖州诺森环保设备有限公司
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[0004] The purpose of the present invention is to overcome the technical deficiencies of the existing polytetrafluoroethylene hollow tubes of insufficient transverse strength and low aperture bubble pressure, and now provides a biaxially stretched porous expanded polytetrafluoroethylene expanded hollow tubular membrane
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Embodiment 1
[0040] A method for preparing a biaxially stretched porous expanded polytetrafluoroethylene expanded hollow tubular membrane, comprising the steps of:
[0041] (1) Mixing
[0042] Add aviationkerosene as a hydrocarbon co-solvent to the dispersed polytetrafluoroethylene resin powder of Zhonghao Chenguang Chemicals 216G; the two are fully mixed in a weight ratio of 1:0.25; at 50 ° C, stand for 24 Hour.
[0044] The mixed material is pre-pressed into a Q120mm cylindrical billet at 50°C, and the billet is compressed at a pusher at 55°C to form a Q22mm round bar, and the round bar is rolled at a calender at 70°C to form an oil-containing base belt with a thickness of is 150 microns.
[0047] The oil-containing base tape is degreased at 260°C, the extrusion aid is removed, and the first longitudinal stretch is carried out, and the stretching rati...
Embodiment 2
[0059] A method for preparing a biaxially stretched porous expanded polytetrafluoroethylene expanded hollow tubular membrane, comprising the steps of:
[0060] (1) Mixture:
[0061] Add ExxonMobil's ISOPARK as a hydrocarbon co-solvent to the 204 dispersion resin powder produced by Dongyue Company, and mix the two at a weight ratio of 1:0.28; stand at 50°C for 24 hours.
[0063] The mixed material is pre-pressed into a cylindrical billet of Q120mm at 50°C, and the billet is pushed into a round bar of Q20mm under the condition of a pusher at 60°C, and the round bar is rolled into an oil-containing base belt at a calender of 70°C, with a thickness of is 120 microns.
[0066] The oil-containing base tape is degreased at 260°C, the extrusion aid is removed, and the first longitudinal stretch is carried out, and the stretching ratio is 4 times; it ...
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technical field [0001] The invention belongs to the technical field of the environmental protectionfiltration industry, and is mainly used for food, medicine, sewage, oil-water separation, gas-water separation, and liquid-solid separation; specifically discloses a biaxially stretched porous expanded polytetrafluoroethylene expanded hollow tubular membrane and its Preparation. Background technique [0002] Biaxially stretched porous polytetrafluoroethylene expanded hollow tube is a newly developed filter material in the world in recent years. It is a porous material formed from polytetrafluoroethylene material through multi-directional stretching (that is, puffing treatment), calendering, heat treatment and other processes. From the appearance, the surface of the material is flat and soft, but under the scanning electron microscope, it can be seen that there are a large number of micropores of 0.05 μm to 2 μm inside the material, and the porosity can account for more than 8...
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