Preparation method of multilayer compound polymer micro-porous film
A composite polymer and multi-layer composite technology, which is applied in nanotechnology, electrical components, electrochemical generators, etc. for materials and surface science, can solve problems such as low efficiency and complex film-making process, and achieve high efficiency, Simple preparation process and excellent performance
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Embodiment 1
[0018] 1. Extrude polyethylene and polypropylene from extruder A and extruder B respectively, and compound them in a T-shaped die. The melt flow rate of polyethylene is 0.1g / 10min, and the density is 0.96g / cm 3 , The melt flow rate of polypropylene is 2.0g / 10min. The screw diameter of extruder A is 40mm, the aspect ratio is 30, the rotation speed is 22n / min, the barrel temperature is 150°C, the head temperature is 230°C, and the runner temperature is 240°C. The screw diameter of extruder B is 60mm, the aspect ratio is 35, the rotation speed is 25n / min, the barrel temperature is 200°C, the head temperature is 150°C, the runner temperature is 240°C, and the T-shaped die temperature is At 200°C, the number of polyethylene / polypropylene composite layers is four.
[0019] 2. The four-layer polyethylene / polypropylene composite sheet extruded through the die is cooled by the air knife, and the temperature of the air knife is 90°C.
[0020] 3. The four-layer polyethylene / polypropyle...
Embodiment 2
[0023] The experimental raw materials adopted are the same as in Example 1, and the screw diameter of the extruder A in Example 1 is changed to 50mm, the aspect ratio is changed to 25, the number of revolutions is changed to 25n / min, and the barrel temperature is changed to 200°C. The head temperature is changed to 230°C, and the runner temperature is changed to 190°C. The screw diameter of extruder B is changed to 20mm, the length-to-diameter ratio is changed to 30, the rotation speed is changed to 15n / min, the barrel temperature is changed to 150°C, the head temperature is changed to 200°C, and the runner temperature is changed to 230°C. The temperature of the T-shaped die is changed to 260°C, and the number of polyethylene / polypropylene composite layers is two. The thickness of the prepared polyethylene / polypropylene composite microporous membrane is 10 μm, the average size of the micropores is 50 nm, and the porosity of the composite microporous membrane is 50%.
Embodiment 3
[0025] Experimental raw materials and operations are the same as in Example 1, and the number of polyethylene / polypropylene composite layers is adjusted to five layers. The thickness of the prepared polyethylene / polypropylene composite microporous membrane is 40 μm, the average size of the micropores is 38 nm, and the porosity of the composite microporous membrane is 60%.
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