A dry-process uniaxially stretched diaphragm and its preparation method
A technology of unidirectional stretching and diaphragm, which is applied in the direction of flat products, other household appliances, structural parts, etc., can solve the problem of large upward breakthrough space, etc., and achieves the advantages of large current discharge and good ion permeability. small resistance effect
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Embodiment 1
[0033] The polypropylene pellets are plasticized by an extruder to form a polypropylene melt, and then extruded from the die, cast into a 29.5u sheet polypropylene base film through a quenching roll, and rolled into rolls with a length of 1000m. The working temperature is 200°C, the set temperature of the die head is 195°C, and the set temperature of the cooling roll is 85°C; the rolled base film is placed in an oven and annealed at 145°C for 12 hours; the annealed polyolefin The base film is sequentially stretched at 3.5m / min, 1.25 times at 80°C in cold state, 3.5m / min, 2.63 times at 145°C in hot state, and set at 156°C for 2 minutes. After cooling, you can get 25u dry single sheet towards the diaphragm.
Embodiment 2
[0035] The polypropylene pellets are plasticized by an extruder to form a polypropylene melt, then extruded from the die, cast into a 19.2u sheet polypropylene base film by a quenching roll, and harvested in a roll with a length of 1000m. The working temperature is 201°C, the set temperature of the die head is 198°C, and the set temperature of the cooling roll is 80°C; the rolled base film is placed in an oven, and annealed at 145°C for 10 hours; the annealed polyolefin The base film is sequentially stretched at 4m / min, 1.20 times at 85°C cold state, 4m / min, 2.75 times at 145°C hot state, and set at 156.5°C for 1.5min. After cooling, you can get 16u dry unidirectional diaphragm.
[0036] Table 1 embodiment sample performance parameters
[0037]
Embodiment 3
[0039] Prepare 16u dry-process unidirectional diaphragm with the same process as Example 2, in which different thermal state stretching ratios are set from 2.5 to 3.0, and the liquid absorption rate and or liquid retention rate of 16u dry-process single-phase diaphragms with different thermal stretching ratios are tested , in order to study the relationship between diaphragms with different thermal stretching ratios and liquid absorption rate and / or liquid retention rate, as shown in Table 2.
[0040] Table 2 Liquid absorption rate and or liquid retention rate corresponding to different thermal stretching ratios
[0041]
[0042]
[0043] It can be seen that the preferred range of thermal stretching ratio is 2.6 to 2.8. If the thermal stretching ratio is too small, there will not be enough micropores, and the liquid absorption rate and or liquid retention rate will not be large; if the thermal stretching ratio is too large, It is easy to cause micropore collapse, which i...
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