Method for forming polyolefin microporous membrane and application thereof
A technology of polyolefin microporous film and polyolefin flow, which is applied in the field of polyolefin film manufacturing, and can solve problems such as difficulty in achieving air permeability
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[0037] Example 1
[0038] Homopolymer polypropylene with a melt index of 3.0g / 10min is used, melted and extruded with a single screw extruder, and cast into a thick film. The extrusion temperature is 220°C, the casting roll temperature is 60°C, and the thickness of the casting thick film is 30μm. It was then heat-treated in an oven at 150°C for 10 hours. The cold drawing temperature is 20°C, the cold drawing ratio is 20%, the hot drawing temperature is 140°C, and the hot drawing ratio is 120%. The heat setting temperature is 140℃, and the heat setting time is 20s. The two corrugating rollers are located in the middle of the 6 sizing rollers, the corrugating roller H / R=0.35, the transverse stretching ratio is 1.2 times, and the final PP microporous film is obtained.
Example Embodiment
[0039] Example 2
[0040] Homopolymer polypropylene with a melt index of 3.0g / 10min is used, melted and extruded with a single screw extruder, and cast into a thick film. The extrusion temperature is 220°C, the casting roll temperature is 60°C, and the thickness of the casting thick film is 30μm. Then heat treatment at 150°C for 10 hours in an oven. The cold drawing temperature is 25°C, the cold drawing ratio is 20%, the hot drawing temperature is 140°C, and the hot drawing ratio is 120%. The heat setting temperature is 140℃, and the heat setting time is 20s. The two corrugating rollers are located in the middle of the 6 sizing rollers, the corrugating roller H / R=0.1, and the transverse stretching magnification is 1.1 times to obtain the final PP microporous film.
Example Embodiment
[0041] Example 3:
[0042] Homopolymer polypropylene with a melt index of 3.0g / 10min is used, melted and extruded with a single screw extruder, and cast into a thick film. The extrusion temperature is 220°C, the casting roll temperature is 60°C, and the thickness of the casting thick film is 30μm. Then heat treatment at 150°C for 10 hours in an oven. The cold drawing temperature is 25°C, the cold drawing ratio is 20%, the hot drawing temperature is 140°C, and the hot drawing ratio is 120%. The heat setting temperature is 140℃, and the heat setting time is 20s. The two corrugating rollers are located in the middle of the 6 sizing rollers, the corrugating roller H / R=0.6, the transverse stretching ratio is 1.3 times, and the final PP microporous film is obtained.
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