What To Do If The PTFE Film Cannot Be Bonded?

2020-03-06 08:50:50

PTFE film cannot be bonded. From the analysis of its chemical properties, the key reasons are as follows: low surface, grain size, good organic chemical reliability, and the structure of the aspect ratio of the PTFE Film. The SP value of the polytetrafluoroethylene film solubility parameter is very small. Low surface, critical surface tension is generally not large. The forward contact angle of polytetrafluoroethylene is 118 degrees, the reverse contact angle is 91 degrees, the contact angle is 104 degrees, the larger of all the raw materials, and the contact angle is larger, and the range of wettability is smaller. Within, that is, poor wettability, insufficient adhesive to wet the PTFE plastic film, so there is no very good adhesion to PTFE grain size, good organic chemical reliability, polytetrafluoroethylene Swelling and melting are all higher than the crystalline polymer, which can not be coated on the surface of the hard polymer molecular chain of the PTFE plastic film. When the adhesion is diffused and entangled, it cannot form strong adhesion.

Polytetrafluoroethylene film can reach DIN4012 fire-resistant standard grade B1, melting temperature is up to 200 degrees Celsius, and will not spontaneously ignite, the quality is very light, good toughness, high tensile strength, not easy to be torn. Long service life At least 30 years, ideal for multi-layer movable roof structures. Because the polytetrafluoroethylene film seals the molecular chain with fluorine atoms, its absorption of other substances is very weak. In the macro world, the surface of the polytetrafluoroethylene film is about 185 N / M lower than that of known materials, and has non-stick properties.

Therefore, the polytetrafluoroethylene film exhibits very good self-cleaning properties and water repellency. PTFE film is a PTFE-coated glass fiber material. PTFE is very inert in the solid state. We must melt it when coating, and then coat it to glass fiber. The melting temperature is above 400 degrees Celsius, and the coating frequency needs about 10 times. In this process, glass fiber will Because the temperature turns yellow, the more the coating is applied, the deeper the color. Therefore, the PTFE polytetrafluoroethylene film has just been produced brown. However, the PTFE polytetrafluoroethylene film can absorb ultraviolet rays in the sunlight. Vinyl film material becomes whiter as it becomes whiter. It can be completely bleached by sunlight.