Expanded PTFE, abbreviated as e-PTFE, is a porous, low-density and high-toughness material that expands the dispersed PTFE resin through a certain production process. Because e-PTFE has excellent induction function of PTFE data, and has a wider temperature range, higher mechanical strength, and some new characteristics such as porosity, gas permeability, hydrophobicity and excellent flexibility, it is medical, environmentally friendly, Textiles, clothing, petroleum, chemicals, new energy and other fields have been widely used. In addition, e-PTFE and specific base cloth materials can be used to prepare polymer composite materials with excellent functions. It can also be successfully applied to energy saving and emission reduction, PM2.5 particulate filtration, water purification, artificial organs, etc. Now e-PTFE Cause more and more attention and attention.
e-PTFE features and functions
e-PTFE is a material that expands PTFE resin into a porous, low-density and high-toughness process through a certain production process. The so-called "expansion" is a processing method in which the raw material is suddenly decompressed under heat and pressure to make it swell. American chemical researcher Wilbert Gore used the term "expansion" in his 1972 patent. In his "expansion" depiction, the proportion of data after processing decreased, and such microstructure was described as " Fiber". With regard to the patent, Wilbert Gore's original intention was to produce an easy-to-use seal that retains the excellent quality of PTFE, but uses less starting materials. In Gore's first patent, it was introduced to produce ribbon PTFE through an extruder, which was subsequently converted into what is now called e-PTFE. In fact, as early as 1969, Gore discovered that PTFE can be made into porous materials, and the strength is almost constant, and has a uniform cross-sectional shape. He also found that the rapid stretching effect at high temperatures can produce superior function. product. In 1976, Gore proposed improvements to porous products, but reduced the need for fillers. Gore explained that reducing fillers during processing not only reduced processing costs but also reduced the risk of impurities. Gore research found that when the initial polymer crystallinity exceeds 98%, the expansion process can be greatly improved. Gore has found through experiments that uniaxial stretching, especially at high ratio expansion, can not only increase the porosity of expanded PTFE, but also add polymer strength. Stretching under the conditions of the lowest crystalline melting point of PTFE, the crystallized polymer is added in a disordered manner to add an amorphous structure content. Locking the grains and fibers enhances creep resistance, resulting in improved data strength. Based on Gore's research, researchers are now able to use expanded materials to make films that are used to separate wet and non-humid liquids, including corrosive liquids, from other materials. Compared with unexpanded PTFE, expanded PTFE can be more easily bonded to other materials, thereby demonstrating that the heat resistance of the expanded data is enhanced.