Crosslinked hollow-fibre membranes and new process for manufacturing the same
A fiber membrane, hollow technology, applied in the field of cross-linked hollow fiber membrane, can solve the problems of difficult gas permeability, reducing the thickness of the separation layer, insufficient mechanical stability, etc.
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Embodiment 1
[0238] Example 1: General description of the membrane production process
[0239] To prepare the phase (a) solution, the polymer (a1.i) is dissolved in a solvent. The solution was devolatilized, thermostated to 50°C, and pumped through a bimaterial die gear. The flow rate is 324g / h. Consists of non-solvent (a2.ii) and diamine crosslinker (a2.i) for polymer (a1.i) when delivering polymer solution (a1) in the outer region of the bimaterial die The phase (a2) of is delivered in the inner region as a pore solution in order to generate pores in the hollow fibers. The flow rate of the pore solution was 120 ml / h. After a distance of 13 cm from the die, the hollow fiber enters a coagulation bath containing warm water at 50°C. The hollow fibers travel through the tubes on their way from the die to the precipitation bath. The tube was filled with a nitrogen flow of 0.90 l / min and the temperature inside the tube was 35°C. The fibers are pulled through a water bath and finally wound...
Embodiment 2
[0241] Example 2: Effect of the amount of diamine crosslinker (a2.i) on the degree of crosslinking (insolubility in DMF) of the membrane
[0242] According to Example 1, hollow fiber membranes were prepared according to the parameters given in Table 4.
[0243] Table 4
[0244]
[0245]
[0246] The results of the analysis in Table 4 show that the degree of crosslinking can be varied over a wide range using the method of the present invention.
Embodiment 3
[0247] Example 3: Effect of Polarity and Annealing Temperature of Diamine Crosslinker (a2.i) on Film Structure and Properties
[0248] According to Example 1, hollow fiber membranes were prepared according to the parameters given in Table 5.
[0249] table 5
[0250]
[0251] The results in Table 5 show that the degree of crosslinking after annealing is at a comparable level if polyethyleneimine with a very low log P value is used as the crosslinker. However, if TMDs with high log P values are used as cross-linking agents, the method of the present invention allows flexible adjustment of the degree of cross-linking.
[0252] In addition, if Figure 3a As shown, the use of polyethyleneimine as a crosslinking agent resulted in the formation of an inner dense layer near the luminal surface of the hollow fiber. Such a structure may be at risk of failure and may result in delamination of the membrane. If the preferred crosslinker TMD is used, the formation of an inner dens...
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