Method for forming porous polyurethane membrane
A polyurethane and porous membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the problems of decreased membrane tensile strength and elongation at break, reduced membrane moisture permeability, and increased production costs , to achieve the effect of reducing production cost, large porosity and reducing dosage
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[0025] a. Preparation of casting solution
[0026] Due to the characteristics of thermoplastic polyurethane that can be completely dissolved by organic solvents, the solute of the casting solution can be selected from thermoplastic polyurethane CorthaneTM or 80A or 90A or ChronoflexAR or Chronoflex CL or Or one of Elast Eon or Cardiomat or Avcothane. The polyurethane is dissolved in an organic solvent, and the polyurethane is completely dissolved through thorough stirring to prepare a casting solution with a mass fraction of 10%-30%. Place the casting solution in a state of vacuum of -0.1~-0.2MPa for 1~3 hours, use the method of air removal to remove the air in the casting solution within the specified time, and obtain no bubbles, transparent and uniform casting solution.
[0027] Among them, 10-30 parts of polyurethane
[0028] Organic solvent 70~90 parts
[0029] The organic solvent is one of tetrahydrofuran or N,N-dimethylformamide or N,N-dimethylacetamide or N-met...
Embodiment 1
[0039] a Weigh 10g polyurethane (Corethane TM ), fully dissolved in 90g tetrahydrofuran to obtain a casting solution with a concentration of 10%. The casting solution was placed in a vacuum state of -0.1MPa for 1 hour to remove air bubbles.
[0040] b Ultrasonic atomization of distilled water with an ultrasonic atomization generator to prepare atomized microbeads with a size of 1-5 μm, and drain the atomized microbeads into a container equipped with a rocking shaker through a drainage tube, and keep In the state of continuous drainage of atomized microbeads, a heater is installed in the drainage tube to heat the atomized microbeads, and the heating temperature is 10°C.
[0041] c Pour the casting solution made in a into the film-making mold to form a casting solution layer with a thickness of 0.1 mm in the mold, and then place the mold on a swinging shaker surrounded by atomized microbeads. Make a rocking motion, the rocking angle is between 0 and 5 degrees, and the rocking f...
Embodiment 2
[0044] a Weigh 15g polyurethane ( 80A), fully dissolved in 85g N, N-dimethylformamide to obtain a casting solution with a concentration of 15%, and place the casting solution under a vacuum of -0.1MPa for 1 hour to remove air bubbles.
[0045] b Ultrasonic atomization of distilled water with an ultrasonic atomization generator to prepare atomized microbeads with a size of 1-5 μm, and drain the atomized microbeads into a container equipped with a rocking shaker through a drainage tube, and keep In the state of continuous drainage of atomized microbeads, a heater is installed in the drainage tube to heat the atomized microbeads, and the heating temperature is 20°C.
[0046] c Pour the casting solution made in a into the film-making mold to form a casting solution layer with a thickness of 0.5 mm in the mold, and then place the mold on a swinging shaker surrounded by atomized microbeads. Make a rocking motion, the rocking angle is between 0 and 10 degrees, and the rocking frequ...
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