Do You Know PTFE Film?

PTFE has the characteristics of resistance to acid, alkali and various organic solvents, and it is almost insoluble in all solvents. PTFE is resistant to high temperatures and has a very low coefficient of friction, so it can be used for lubrication and becomes an ideal choice for easy cleaning of the inner layer of water pipe dopes.

 

1. What is the microstructure of PTFE membrane?

 

The surface morphology of the PTFE microporous film is a spider web-like microporous structure. Pores are formed between the microfibers, and the arrangement direction of the microfibers is basically parallel to the stretching direction. The junction of the fiber bundle is the node, which is formed by the entangled connection of many microfibers.

 

PTFE membrane is an asymmetric membrane. There are differences in the size of the micropores on the front and back of the membrane.

 

The cross-sectional micropore size of the membrane is larger than the micropore size on the surface. There are also differences in the size of the vertical and horizontal micropores. Longitudinal micropores are larger than horizontal.

 

The cross-section of the PTFE membrane is a network structure. There are very complicated changes in the three-dimensional structure of the pores, such as network connection, hole inserting, and pore bending. There may be multiple micropores to form a channel, or one micropore and multiple The channels are connected.

 

2. Is the PTFE membrane organic?

 

The presence of C in the chemical formula of PTFE membrane does not mean that it must be organic, because CO₂ also contains C. CO₂ is the final product of organic combustion. Carbon dioxide will not burn. PTFE reacts with oxygen under certain conditions, and the final product produced is CO₂. Therefore, PTFE membranes are organic materials and organic membranes, which can also be called PTFE organic membranes.

 

3. How high temperature can the PTFE membrane withstand?

 

The temperature range of PTFE membrane is wide, and it can be used in the temperature range of -70℃~230℃. The low and high temperature resistant PTFE membrane can maintain excellent mechanical properties.

 

4. What are the salient features and uses of PTFE membranes?

 

The PTFE membrane structure is a new form of building structure. It integrates architecture, structural mechanics, fine chemicals, materials science, and computer technology, and has a high technical content. The following will analyze some common problems of PTFE membranes.

 

PTFE membrane material is made of ultra-fine glass fiber fabric coated with polytetrafluoroethylene resin. This kind of membrane material has good welding performance, excellent anti-ultraviolet, anti-aging performance and flame-retardant performance. In addition, its anti-fouling and self-cleaning properties are the best among all architectural membranes. However, the flexibility is poor, the construction is difficult, and the cost is very high. Unlike most solid building materials, the soft PTFE membrane material can be stretched into various dynamic arc shapes.

 

The PTFE mask film has high porosity and strong hydrophobicity. The pore size of the mask made of PTFE membrane can trap large particles in the air, prevent fine dust from entering the filter material, and achieve surface filtration. This type of mask can effectively reduce the concentration and use of bacteria and viruses in the air, and extend the service life.