A multi-stage pressurized fluorination treatment method for the surface of plastic parts

Abstract

The invention discloses a multi-stage pressurized fluorination treatment method of the surface of a plastic part. According to the multi-stage pressurized fluorination treatment method, except for cleaning and drying the plastic part and replacing air inside a closed reaction chamber of fluorination equipment with nitrogen gas, a core technology is achieved by preheating the reaction chamber tillthe internal temperature is 35-45 DEG C and then inflating mixed gas of fluorine gas, nitrogen gas and oxygen gas, wherein the volume ratio of the fluorine gas to the nitrogen gas is 1:6 to 1:10 and the oxygen gas accounts for 1 / 200-1 / 400 of the volume of the fluorine gas; a reaction is divided into n pressure stages, n is a natural number of 2-5, the chamber pressure in a first pressure stage is5-10mbar, the pressure deltaP in an adjacent pressure stage increases to 5-100mbar, and the reaction time in each pressure stage is 3-10 minutes; finally, at the end of the reaction, the plastic partis taken out. By the multi-stage pressurized fluorination treatment method, the surface energy of the plastic part can be effectively improved and maintained stable, so that better bonding of the plastic part with ink, paint, glue, coating, a foil and other materials is guaranteed, and a better bonding effect is achieved.

Description

technical field [0001] The invention relates to a multi-stage pressurized fluorination treatment method for the surface of plastic parts. Background technique [0002] Plastic parts have easy molding, light weight and other good physical and chemical properties, so they are widely used in industrial fields such as packaging, daily necessities and automobiles. In the prior art, the surface of plastic parts needs to be sprayed with ink, paint, glue, paint, etc. according to different functional requirements (such as printing or improving anti-corrosion and aging resistance, etc.), or add different materials by hot foil process, but plastic parts The relatively inert chemical structure determines its poor adhesion to other materials. In order to improve this shortcoming, it is necessary to carry out surface pretreatment on the surface of plastic parts, change the surface polarity to enhance its surface chemical activity and surface energy, and ensure better adhesion between pl...

AI Technical Summary

Problems solved by technology

[0009] (1) The surface of the material after flame and plasma treatment is still in a metastable state. This unstable high-energy state will inevitably cause energy release, resulting in recovery of surface modification;

[0010] (2) After the flame and plasma treatment, the surface is exposed to the air, which will adsorb small molecules in the air and cause the surface energy to decrease;

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