Improved preparation method of polypropylene hollow fiber separation membrane
A technology of fiber separation and polypropylene, applied in the direction of semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the problems of uneven distribution of membrane pores, dense cortex on the outer surface of the membrane, etc., and achieve the effect of simple method
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[0035] Example 1
[0036] An improved preparation method of polypropylene hollow fiber separation membrane, the specific steps are as follows:
[0037] (1) Add polypropylene and diluent to the spinning kettle with agitating device, the mass fraction of polypropylene is 25%, the melt index is 2.7g / 10min, soybean oil is used as the diluent, and the mass fraction of diluent is 75 %, heated to 200°C, and stirred for 0.5 hours under nitrogen flow. After the stirring is stopped, let it stand for 0.5 hours at a constant temperature to degas to obtain a casting liquid;
[0038] (2) The casting film liquid (temperature 200℃) is filtered through a 100-mesh stainless steel filter screen, and a gear-type metering pump is used to transport the casting film liquid to the spinneret. Nitrogen is used as the inner core liquid to be introduced into the spinneret to form hollow fibers. The temperature of the spinneret is 175℃; the hollow fiber is extruded, firstly pass through an air gap of 1cm, and t...
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[0041] Example 2
[0042] An improved preparation method of polypropylene hollow fiber separation membrane, the specific steps are as follows:
[0043] (1) Add polypropylene and diluent to the spinning kettle with stirring device, the mass fraction of polypropylene is 40%, the melt index is 8g / 10min, and the mixture of soybean oil and dioctyl phthalate is used as the dilution In the mixture, the mass fraction of dioctyl phthalate is 10%, and the mass fraction of diluent is 60%. Heat to 175°C and stir under nitrogen for 3 hours. Stop stirring and let stand at constant temperature to degas 2 Hours, get the casting liquid;
[0044] (2) The casting film liquid (temperature 175℃) is filtered through a 100-mesh stainless steel filter screen, and a gear-type metering pump is used to deliver the casting film liquid to the spinneret. Nitrogen is used as the inner core liquid to be introduced into the spinneret to form hollow fibers. The temperature of the spinneret is 140℃; when extruding t...
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[0047] Example 3
[0048] An improved preparation method of polypropylene hollow fiber separation membrane, the specific steps are as follows:
[0049] (1) Add polypropylene resin and diluent to the spinning kettle with stirring device, the mass fraction of polypropylene is 27%, the melt index is 3g / 10min, and the mixture of soybean oil and dibutyl phthalate is used as Diluent, the mass fraction of dibutyl phthalate in the mixture is 90%, and the mass fraction of diluent is 73%. Heat to 180°C and stir for 1 hour under nitrogen flow. Stop stirring and let stand at constant temperature for defoaming 1 hour, get the casting liquid;
[0050] (2) The casting liquid (temperature 180℃) is filtered through a 100-mesh stainless steel filter screen, and the casting liquid is delivered to the spinneret by a gear-type metering pump, and nitrogen is used as the inner core liquid to be introduced into the spinneret to form hollow fibers. The temperature of the spinneret is 145°C; the hollow fibe...
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