It has been more than 60 years since the American DuPont Company began producing polytetrafluoroethylene in 1945.
Now as an important product of ptfe, ptfe biaxially oriented film is widely used. Let’s take a look.
In the 1960s, PuPont first used uniaxial stretching to produce PTFE stretched membranes, but the size of the micropores, porosity, and membrane strength were not ideal.
In the mid-1970s, the American Gore Company successfully developed expanded PTFE microporous films using biaxial stretching technology. After that, Japan made great progress in research in this area and applied for a number of patents.
my country began to develop PTFE stretched membranes after the 1970s, but it has been stuck in the uniaxial stretching process for a long time. Since the 1990s, some units have developed and produced biaxially stretched microfiltration membranes.
There are two main methods for preparing ptfe biaxially oriented film that have been reported so far.
One is to add the pore-forming agent NaCl to PTFE, then make the PTFE into a film, and then remove the NaCl by heating and washing with water. The vacancies left by the NaCl form pores. The microporous film made by this method has the smallest pore size. is 0.1μm.
The second is the mechanical stretching method. The microporous film made by the modified method has a special structure of island-like “knots” connected by microfibers. It is currently the main method for preparing PTFE microporous films.
Suzhou New Material Technology Co., Ltd. is a high-tech enterprise specializing in the research, development and production of fluorine material film technology. The ptfe biaxially stretched film we produce uses mechanical stretching and can be produced according to user requirements.
The optimized combination of key technical parameters such as speed ratio, pressure ratio, operating temperature, etc. can realize online control of air permeability, thickness and void ratio according to the ratio and pore-forming medium to meet the different requirements you need. .
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