Method for forming asymmetric polytetrafluoroethylene porous membrane
A polytetrafluoroethylene and porous membrane technology, which is applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problem of high temperature control requirements and achieve the effect of optimizing performance
Inactive Publication Date: 2013-07-10
HANGZHOU COBETTER FILTRATION EQUIP
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Problems solved by technology
The disadvantage of the phase inversion method is that there are very few solvents that can dissolve PTFE, and generally high temperature is required to dissolve
These methods of using temperature gradient distribution to obtain asymmetric structures have disadvantages such as high temperature control requirements.
Method used
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Experimental program
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Effect test
Embodiment 1
[0018] Squeeze the symmetrical PTFE porous membrane between the steel roller and the rubber roller (hardness 30A). The number of times is 10 times. Table 1 shows the evaluation results of the film after the extrusion treatment.
Embodiment 2
[0020] Squeeze the symmetrical PTFE porous membrane between the steel roller and the rubber roller (hardness 30A). The number of times is 20 times. Table 1 shows the evaluation results of the film after the extrusion treatment.
Embodiment 3
[0022] Squeeze the symmetrical PTFE porous membrane between the steel roller and the rubber roller (hardness 48A). The number of times is 3 times. Table 1 shows the evaluation results of the film after the extrusion treatment.
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Abstract
The invention provides a method for forming an asymmetric polytetrafluoroethylene porous membrane. The method can simply produce an asymmetric polytetrafluoroethylene porous membrane and optimizes membrane performance. The method provided by the invention is realized through the following technical scheme: a symmetry polytetrafluoroethylene porous membrane is subjected to multiple extrusion treatments between a steel roller and a rubber roller; the rubber roller has surface hardness of 30-60A; and the extrusion treatment comprises conditions of: temperature of 20-250 DEG C, pressure of 46-90N / cm, speed of 0.9-1.8m / min and extrusion for 3-20 times.
Description
technical field [0001] The invention relates to a method for forming a polytetrafluoroethylene porous membrane, in particular to a method for forming an asymmetric polytetrafluoroethylene porous membrane. Background technique [0002] Polytetrafluoroethylene porous membrane (hereinafter referred to as PTFE porous membrane) is widely used in medicine, electronics, chemical industry, environmental protection, food and many other fields due to its good chemical stability and thermal stability. [0003] U.S. Patent US3953566 discloses the method for manufacturing PTFE porous film by stretching the earliest, and its method is: after the mixture of PTFE resin and extrusion aid is extruded, dried, calendered, then stretched and heat-set, obtain by countless microfibers and The nodes form a porous membrane with a microporous structure. The size of the microfibrils and nodes of this porous membrane is uniform from one side of the membrane to the other, and then the pore diameters ar...
Claims
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Patent Timeline
Login to View More IPC IPC(8): B01D71/36B01D69/06
Inventor 盛凤翔
Owner HANGZHOU COBETTER FILTRATION EQUIP