The expanding fields of ptfe biaxially stretched film range from bioengineering to the clothing industry, from the machinery industry to petrochemicals. In the environmental protection industry, it can not only be used in water treatment projects, but also can be used for air particle purification. It can be said that it The application fields are very wide.
As early as the mid-18th century, someone discovered the membrane phenomenon, but it was only in the past 50 years that the membrane process was actually applied to the industrial field.
In my country, the membrane industry started in the 1960s. After decades of development, membrane technology has become an emerging and mature chemical separation technology.
Mature and developed technologies such as reverse osmosis, ultrafiltration, microfiltration, nanofiltration, electrodialysis, gas separation, inorganic membrane, pervaporation, membrane contact, ptfe biaxially stretched membrane, membrane reaction and controlled release are being It is used in industrial production and has produced good economic and social benefits.
The membrane separation process has become an important high-tech and sustainable development technology foundation for solving contemporary energy, resource and environmental pollution problems.
Among them, microfiltration is currently the most commonly used pressure-driven membrane technology with the largest sales volume. It is mainly used for the separation, purification, concentration and purification of particles, and is widely used in food, medicine, drinking water, Urban sewage treatment, etc.
The preparation method of ptfe biaxially stretched film is to mix dry PTFE fine powder and additives thoroughly, then enter the extruder, and the powder is pushed to extrude strips of PTFE, as shown in Figure 1, and then rolled The film is rolled into a film sheet under the machine. After heating to evaporate the additives, it can be stretched vertically and horizontally, and then through heat treatment, shaping, cutting and winding to obtain a biaxially stretched microfiltration membrane.
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