Polyolefin microporous membrane, making method thereof, and lithium ion battery
A polyolefin microporous film and microporous film technology, applied in secondary batteries, battery pack parts, circuits, etc., can solve the problems of inability to maintain melt integrity, temperature rise, strength reduction, etc., and achieve improved film rupture. Effects of temperature and high temperature melt integrity, good processability, moderate porosity
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[0048] 2. Preparation method of polyolefin microporous membrane
[0049] 2.1 Description of raw materials and process parameters
[0050] In order to give full play to the performance advantages of polyethylene resin and polypropylene resin, the present invention uses a pre-blending method to mix two different polyolefin resins together, which can not only form a uniform blend, but also achieve excellent blending performance.
[0051] In order to obtain a blend with good compatibility, according to the principle of similar compatibility, the present invention selects polypropylene resin and polyethylene resin with similar viscosity values for blending. The polyethylene resin and polypropylene resin used in the present invention have intrinsic viscosity values between 200ml / g-1000ml / g, and the difference between the two is less than 100ml / g.
[0052] The present invention has no special limitation on the process of preparing polyolefin masterbatch by twin-screw extruder, ...
Embodiment 1
[0071] a. Preparation of polyolefin masterbatch:
[0072] Add polypropylene resin with an intrinsic viscosity of 560ml / g and polyethylene resin with an intrinsic viscosity of 480ml / g into a twin-screw extruder, melt and knead at 220°C, and pelletize after extrusion. After two consecutive granulations, the polyolefin masterbatch is obtained for use. Among them, polypropylene resin accounts for 65% of the total, and polyethylene resin accounts for 35% of the total.
[0073] b. Preparation of oily slabs:
[0074] Add polyolefin masterbatch and liquid paraffin into the twin-screw extruder from different feeding ports and melt and knead at 215°C. After extruding from the die, cool down with a 40°C cooling roll to make phase separation to make oil-containing thick piece. Among them, the masterbatch accounts for 40% of the total weight of the oily slab, and the liquid paraffin accounts for 60% of the total weight of the oily slab.
[0075] c. Biaxially stretch the oil-containing ...
Embodiment 2
[0080] a. Preparation of polyolefin masterbatch:
[0081] Add a polypropylene resin with an intrinsic viscosity of 900ml / g and a polyethylene resin with an intrinsic viscosity of 1000ml / g into a twin-screw extruder, melt and knead at 260°C, and pelletize after extrusion. After three times of continuous granulation, polyolefin masterbatches are obtained for future use. Among them, polypropylene resin accounts for 50% of the total, and polyethylene resin accounts for 50% of the total.
[0082] b. Preparation of oily slabs:
[0083] Add polyolefin masterbatch and liquid paraffin into the twin-screw extruder from different feeding ports and melt and knead at 220°C. After extruding from the die, cool down with a 60°C cooling roll to make phase separation to make oily thick piece. Among them, the masterbatch accounts for 30% of the total weight of the oily slab, and the liquid paraffin accounts for 70% of the total weight of the oily slab.
[0084] c. Biaxially stretch the oil...
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