A kind of microporous film and its preparation method and application
A technology of microporous film and dry grinding method, applied in the field of microporous film and its preparation, can solve difficult industrial production and application, poor universality, PTFE film pore size, pore size distribution, pore size and porosity are difficult to control, etc. problem, to achieve the effect of excellent air permeability, excellent pressure resistance, and simple overall process
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Embodiment 1
[0048] A method for preparing a microporous film, specifically comprising the steps of:
[0049] (1) Pre-sinter the polytetrafluoroethylene resin (Daikin M18) at 380°C for 4 hours, and pulverize it by dry grinding to obtain D 50 90μm, D 10 25μm, D 90 225μm fully sintered material;
[0050] (2) The complete sintered material obtained by 1600g step (1) is mixed with 400g polytetrafluoroethylene resin (Daikin M18), molded for 20min under a pressure of 20MPa, and sintered under the condition of first heating up and then cooling down, said The method of heating up first and then cooling down is as follows: raise the temperature of the system to 335°C, keep it for 2 hours, heat it up to 380°C, keep it for 4 hours, cool it down to 335°C, keep it for 2 hours, drop it to room temperature, and turn it to get a thickness of 0.22mm and a width of 150mm microporous film.
Embodiment 2
[0052] A preparation method of a microporous film, comprising step (1) and step (2); wherein, step (1) is the same as step (1) of Example 1, and step (2) is specifically as follows:
[0053] (2) The complete sintered material obtained by 1000g step (1) is mixed with 1000g polytetrafluoroethylene resin (Daikin M18), molded for 20min under a pressure of 20MPa, and sintered under the condition of first heating up and then cooling down, said The method of heating up first and then cooling down is as follows: raise the temperature of the system to 300°C, keep it for 4 hours, heat it up to 350°C, keep it for 6 hours, cool it down to 300°C, keep it for 4 hours, drop it to room temperature, and turn it to obtain a thickness of 0.22mm and a width of 150mm microporous film.
Embodiment 3
[0055] A method for preparing a microporous film, specifically comprising the steps of:
[0056] (1) Pre-sinter polytetrafluoroethylene resin (Daikin M18) at 340°C for 4 hours, and pulverize it by water milling to obtain D 50 70μm, D 10 30μm, D 90 250μm semi-sintered material;
[0057] (2) Mix the semi-sintered material obtained in 1600g step (1) with 400g polytetrafluoroethylene resin (Daikin M18), carry out molding under the pressure of 20MPa for 20min, and sinter under the condition of first heating up and then cooling down, said The method of heating up first and then cooling down is as follows: raise the temperature of the system to 335°C, keep it for 2 hours, heat it up to 390°C, keep it for 4 hours, cool it down to 335°C, keep it for 2 hours, drop it to room temperature, and turn it to obtain a thickness of 0.22mm and a width of 150mm. microporous film.
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Abstract
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