There are many kinds of recycled fluoroplastics, but many fluoroplastics have small polarity, high crystallinity, low surface tension, poor wettability, and smooth surface. In order to improve the adhesion of coatings to fluoroplastics and reduce various defects on the surface, thereby improving The quality of the fluoroplastic coating should be treated before the fluoroplastic coating. What are the methods used to recycle fluoroplastics in surface treatment?

Annealing: fluorine plastic is easy to form internal stress during molding, and it is easy to crack at the stress concentration. In order to relieve the internal stress generated during molding and prevent cracking, annealing treatment should be carried out.

Degreasing:Recycling fluoroplasticsOil must be removed and degreased when the surface is oily. The degreasing method is similar to the metal, and an alkaline water washing solution, a surfactant, or the like can be used.

Electrostatic dust removal: Most fluoroplastics are insulators, which are prone to static electricity and absorb dust. Therefore, for mass-produced parts, compressed air is commonly used for electrostatic dust removal through electrostatic generation devices.

Wetting and roughening: chromic acid, sulfuric acid mixture treatment method, is more convenient traditional method, it can make fluorine plastic surface wettability significantly improved. Fluoroplastics impregnated with organic solvents can remove the various amorphous parts of the surface of the fluoroplastic, making it roughened or versatile, and improving the adhesion of the coating.

Temperature will affect the speed of oil removal, generally speaking, the temperature of high energy to speed up the speed of oil removal, but the temperature is too high will make the surfactant decomposition, affect the effect of oil removal.

Alkaline solution degreasing is generally carried out in the steel tank, the temperature is between 50~80 ℃, the number of oil removal depends on the output and the degree of oil pollution, generally 1~2 times, for large quantities of parts can be used in the construction process of pressure jet.

Emulsifier degreasing: the use of emulsifier wetting, emulsification, solubilization and dispersion ability to remove the oil on the surface of the workpiece, such as emulsifiers. Solvent degreasing: the use of organic solvents on the solubility of grease, to remove the oil on the surface of the workpiece, commonly used organic solvents are gasoline, kerosene, pine perfume and so on.

The pretreatment methods of recycled fluoroplastics mainly include: annealing; degreasing; electrostatic dust removal; wetting and coarsening.

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