Microporous polypropylene membrane and preparation method thereof
A technology of polypropylene microporous membrane and microporous membrane, applied in the direction of chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of strong irritating odor, physiological toxicity of diluent, etc., and achieve the effect of simple method
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[0043] The preparation method of above-mentioned polypropylene microporous membrane, comprises the following steps:
[0044] Step a, after mixing polypropylene resin and diluent to obtain casting liquid;
[0045] Step b, the casting liquid is filtered through a filter;
[0046] In step c, the filtered film casting liquid is transported to a slit die, extruded through the slit die to obtain a flat film precursor, and then the flat film precursor is immersed in a coagulation bath and cooled to solidify to obtain a polypropylene microfiber. Pore membrane precursor;
[0047] Step d, after winding the polypropylene microporous membrane precursor with a winding machine, put it into a microporous membrane extraction device and extract it with an extractant;
[0048] In step e, the extracted microporous membrane precursor is dried by a freeze-drying device, and after the extraction agent is removed, a polypropylene microporous membrane is prepared.
[0049] On the basis of the ab...
Embodiment 1
[0062] A polypropylene microporous membrane with an average pore diameter of 0.04 μm and a contact angle of 125.6°, the preparation method of which is as follows: the heating temperature is 175-200° C., the pressure is -0.095 MPa, the stirring time is 0.5-12 h, and the defoaming time is 0.5-12 h. 12h.
[0063] The slit gap distance of the slit die in step c is 2-10 mm, and the temperature of the die is 140-175°C, preferably 145-165°C.
[0064] The alcohol substance is preferably ethanol or isopropanol, and the heating temperature of the warm chloroform is 30-50°C.
[0065] (1) Add 20wt% polypropylene resin and 80wt% mixed diluent of carnauba wax and soybean oil into a kettle with stirring device, and the content of carnauba wax in the diluent is 10wt%. Heating to 175°C, stirring for 1.5h under the pressure of -0.095MPa, after stopping the stirring, under the pressure of -0.095MPa, let it stand for degassing at a constant temperature for 1.5h to obtain the casting liquid;
[...
Embodiment 2
[0079] A polypropylene microporous membrane with an average pore diameter of 0.033 μm and a contact angle of 140.0°, the preparation method of which is as follows:
[0080] (1) Add 30wt% polypropylene resin and 70wt% mixed diluent of carnauba wax and soybean oil into a kettle with stirring device, and the content of carnauba wax in the diluent is 20wt%. Heating to 180℃, under the condition of pressure -0.095MPa, stirring for 0.5h, after stopping stirring, under the pressure of -0.095MPa, let it stand for degassing at constant temperature for 0.5h to obtain the casting liquid;
[0081] (2) Filter the casting solution with a temperature of 180°C through a 100-mesh stainless steel filter screen, and extrude it through a slit die with a gap distance of 4mm and a die temperature of 140°C. The extruded flat film precursor is first After being cooled by air cooling, it is wound on a cooling roll and immersed in a double-stage coagulation bath for cooling. The first-stage coagulation ...
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