How can the weathering of the plastic film on the surface of FRP be removed?
Flame treatment. Is the use of high temperature flame will burn plastic film of oil and dirt, with the plastic film surface oxidizing flame flame molecular oxidation, decomposition, generating hydroxyl unsaturated double bonds or oxygen containing polar groups, the decomposition of surface molecular chain fracture, plastic film, thus changing the microscopic shape of the plastic film surface, to increase the film surface roughness. In general, the flame surface treatment method has the advantages of short processing time, high speed and good effect, and the treatment effect is stable, and the range of use is wider than that of the spark treatment method. Plastic films or aluminum foils such as PE, PP, PET, PA and Al can handle it. Flame treatment power method of surface treatment, but also on the plastic film on both sides, and the barber non-toxic, no pollution, so it is very suitable for plastic film manufacturers in large production line, film blowing, flow, pull, and synchronized hot film processing.
Corona treatment. It is commonly known as electrical discharge treatment, which is the most common treatment for plastic film production, printing and compounding. The process of EDM processing is that processor release high frequency and high power, produce small dense purple spark to the impact surface of plastic film, chemical bond breaking molecules on the surface of plastic film and degradation, increased the surface roughness. In addition, a large amount of ozone is generated at the same time of discharging, and the surface of the film is oxidized to produce a strong polar group, such as carbonyl group and peroxide, so that the surface of the plastic film is roughened, and the surface tension of the film is enhanced.
Solvent treatment. The use of solvent dissolution to deal with, clear plastic film surface of the organic dirt, dissolved and swollen plastic film surface, to improve adhesion to the ink. Because this method is more polluting to the environment, and the surface of some plastic film will corrode and cause cracking, so it has not been used except for the laboratory.
Oxidation process. With strong oxidant rinse solution (such as the Potassium Permanganate solution), the wax plastic film surface cleaning. The polar group is introduced to oxidize and break the molecular chains of the surface layer of the plastic film, to form micropores and to increase the roughness of the surface. The treatment method does not need special equipment, is easy to operate, has low cost, good effect and stable treatment. However, due to the long processing time, after the treatment has to be washed and dried, low efficiency and environmental pollution, so rarely used this method to deal with plastic film in large quantities.
