PTFE (polytetrafluoroethylene) flat membrane and preparation method thereof
A polytetrafluoroethylene and flat membrane technology is applied in the field of membrane distillation, which can solve the problems of difficulty in taking into account separation accuracy and processing efficiency, difficulty in implementation, and high cost of use, and achieve long-term effective operation, long cleaning cycle, and long service life. Effect
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Embodiment 1
[0025] A polytetrafluoroethylene flat film with a three-dimensional through-hole pore structure, with stem holes on the stems surrounding the pores, the pore diameter is 200±100nm, the stem diameter is 125±75nm, and the stem hole diameter is 45±25nm; the pores of the pores The ratio is 60±10%, the porosity of the stem hole is 55±10%; the total surface area of the stem, stem area:stem hole area=15-30:1. The film thickness is 100-300µm.
[0026] Stem surface area image analysis: photographs of the material were taken with a scanning electron microscope (SEM photographs, magnified 10000-50000 times). Scan this photo with image processing equipment (the television image processor TVIP-4100II that Japan Avionics company produces, the television image processor that Latock system engineering company provides) stem and stem hole are separated to obtain stem and stem hole image, The image is processed by software to obtain the respective areas, and the ratio of the stem area to the...
Embodiment 2
[0035] A polytetrafluoroethylene flat film has a three-dimensional through-hole pore structure, and there are stem holes on the stems surrounding the pores, the pore diameter is 150-250nm, the stem diameter is 100-120nm, and the stem pore diameter is 25-50nm; the pores of the pores The ratio is 55-65%, and the porosity of the stem hole is 50-55%; the total surface area of the stem, stem area:stem hole area=20-26:1. The film thickness is 120-150µm.
[0036] The hydrophobic angle of the obtained material is 162-170°. The obtained PTFE material is subjected to membrane distillation of taurine wastewater at normal temperature, which has excellent properties and effects suitable for industrial production. Taurine can obtain products superior to pharmaceutical standards, and water can reach the standard of medical water for injection. Membrane distillation flux>20L / m 2 h, the rejection rate was stable above 99%, and the membrane distillation was carried out continuously for mor...
Embodiment 3
[0038] A polytetrafluoroethylene flat film has a three-dimensional through-hole pore structure. There are stem holes on the stems surrounding the pores. The pore diameter is 230nm. The porosity of the pores is 52%; the total surface area of the stem, stem area:stem pore area=24:1. The film thickness is 120µm.
[0039] The hydrophobic angle of the obtained material is 168°. The obtained PTFE material is subjected to membrane distillation of taurine wastewater at normal temperature, which has excellent properties and effects suitable for industrial production. Taurine can obtain products superior to pharmaceutical standards, and water can reach the standard of medical water for injection. Membrane distillation flux>20L / m 2h, the rejection rate was stable above 99%, and the membrane distillation was carried out continuously for more than 5 months, the flux dropped to 70-75% of the original flux, the color of the material after cleaning was pure white, and the flux returned t...
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