PTFE film It cannot be bonded. According to the analysis of its chemical properties, the key reasons are as follows: low surface, grain size, good reliability of organic chemistry, teflon The solubility parameter SP of PTFE film is very small due to the symmetry of the aspect ratio of the film. Low surface, critical surface tension is generally small. The forward contact angle of PTFE is 118 degrees, the backward contact angle is 91 degrees, and the contact angle is 104 degrees. The larger of all raw materials, the larger of the contact angle, and the smaller of the wettability, that is, the wettability is poor, and the adhesive is insufficient to wet the Teflon film, so there is no very good adhesion Teflon The crystal size of Teflon film and the reliability of organic chemistry are good. The swelling and melting of polytetrafluoroethylene are all higher than that of the junction crystal polymer, which cannot be coated on the hard polymer molecular chain on the surface of Teflon plastic film. When the bonding is mutually diffused and tangled, it cannot form strong adhesion.

The polytetrafluoroethylene film can reach Grade B1 of DIN4012 fire protection standard, the melting temperature is up to 200 ℃, and it will not spontaneously ignite. It is light in weight, good in toughness, high in tensile strength, and not easy to tear. Long service life The service life is at least 30 years. It is an ideal material for multi-layer movable roof structures. Because PTFE film is sealed by fluorine atoms, its absorption to other substances is very weak. In the macro world, the surface of polytetrafluoroethylene film is about 185N/M, which is the lower of known materials, and has non stick property.

Therefore, PTFE film shows very good self-cleaning and water repellency. The polytetrafluoroethylene film is a PTFE coated glass fiber material. PTFE is very inert in solid state. When coating, we must melt it and then coat it on glass fiber. The melting temperature is above 400 ℃, and the coating times need about 10 times. In this process, the glass fiber will turn yellow due to high temperature, and the more the coating times, the darker the color. Therefore, the PTFE polytetrafluoroethylene film material just produced is brown. However, PTFE polytetrafluoroethylene film material can absorb ultraviolet light in sunlight. The more white the polytetrafluoroethylene film material becomes, the more completely bleached it can be by sunlight. The stronger the ultraviolet light, the faster the whitening.