PTFE (polytetrafluoroethylene) spiral-wound membrane and preparation method thereof
A technology of polytetrafluoroethylene and roll-type membrane, which is applied in the field of membrane distillation, can solve the problems of difficult balance between separation accuracy and processing efficiency, high difficulty in realization, high cost of use, etc., and achieves good selection efficiency and selection effect, easy to use and operate, The effect of long service
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Embodiment 1
[0027] A polytetrafluoroethylene roll-type membrane with a three-dimensional penetrating pore structure, with stem holes surrounding the stems, the pore diameter is 800±200nm, the stem diameter is 500±100nm, and the stem pore diameter is 175±25nm; the pores of the pores The porosity is 60±10%, the porosity of the stem hole is 55±10%; the total surface area of the stem, stem area:stem hole area=1-15:1. The film thickness is 100-200µm. The diameter is 80-250mm.
[0028] 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 rat...
Embodiment 2
[0038] A polytetrafluoroethylene roll-type membrane has a three-dimensional through-hole pore structure. There are stem holes on the stems surrounding the pores. The porosity is 55-70%, the porosity of the stem hole is 50-60%; the total surface area of the stem, stem area:stem hole area=3-6:1. The film thickness is 100-200µm. The diameter is 80-250mm.
[0039] The hydrophobic angle of the obtained material is 155-175°. The obtained PTFE material is subjected to membrane distillation: it is used for the treatment of lemon juice, and has excellent properties and effects suitable for industrial production. Highly concentrated fruit juice can be obtained without damaging nutrients (such as vitamin C, total acid, TSS, etc.). Membrane distillation flux>20L / m 2 h, the rejection rate is stable above 99.5%, and the membrane distillation is carried out continuously for 3-5 months, the flux drops to 68-75% of the original flux, the color of the material after cleaning is pure white...
Embodiment 3
[0041] A polytetrafluoroethylene roll-type membrane with a three-dimensional through-hole pore structure. There are stem holes on the stems surrounding the pores. The pore diameter is 880nm, the stem diameter is 550nm, and the stem pore diameter is 160nm; the porosity of the pores is 58%. The porosity of the stem hole is 58%; the total surface area of the stem, stem area:stem hole area=5:1. The film thickness is 150µm. The membrane diameter is 120mm.
[0042] The resulting material had a hydrophobic angle of 160°. The obtained PTFE material is subjected to membrane distillation: it is used for the treatment of lemon juice, and has excellent properties and effects suitable for industrial production. Highly concentrated fruit juice can be obtained without damaging nutrients (such as vitamin C, total acid, TSS, etc.). Membrane distillation flux>20L / m 2 h, the rejection rate is stable above 99.5%, and the membrane distillation is carried out continuously for 3-5 months, the fl...
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Abstract
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