Highly-oil-repellenting highly-waterproof seamless polytef expansion sheet materials and preparation method thereof
A seamless polytetrafluoroethylene, polytetrafluoroethylene technology, used in chemical instruments and methods, flat products, other household appliances, etc., to achieve uniform sealing, good elasticity, and light weight
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Embodiment 1
[0038] A method for preparing a highly oil-repellent and highly waterproof seamless polytetrafluoroethylene expanded board, comprising the following steps:
[0039] (1) Mixing
[0040] Mix Zhonghao Chenguang Chemical 216G dispersed polytetrafluoroethylene resin powder, then add aviation kerosene as a hydrocarbon co-solvent; mix the two thoroughly at a weight ratio of 1:0.25; stand at 50°C for 24 hours .
[0041] (2) Blank making, extrusion, calendering
[0042] 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.
[0043] (3) Degreasing, longitudinal stretching
[0044] 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 becomes a degrea...
Embodiment 2
[0055] A method for preparing a highly oil-repellent and highly waterproof seamless polytetrafluoroethylene expanded board, comprising the following steps:
[0056] (1) Mixture:
[0057] Mix the 204 dispersion resin powder produced by Dongyue Company, and then add aviation kerosene hydrocarbon co-solvent; the three are mixed in a ratio of 1:0.28 by weight; stand at 50°C for 24 hours.
[0058] (2) Blank making, extrusion, calendering
[0059] 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.
[0060] (3) Degreasing, longitudinal stretching
[0061] The oil-containing base tape is degreased at 280°C, the extrusion aid is removed, and the first longitudinal stretch is carried out, and the stretching ratio is 3 times to become a degreased ba...
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