Method for nano-depth surface activation of PTFE-based membrane

A method of preparing a polytetrafluoroethylene (PTFE)-based membrane for bonding, comprising the following steps:

• preparing a PTFE based membrane with a nano-scale and micron-scale concave-convex geometrical ultra-micro-structure morphology, and covering a surface of the PTFE based membrane,
• performing surface activation treatment in a vacuum environment where a nitrogen-hydrogen mixed medium atmosphere below 40° C. is provided, at a speed of 1.5-3 m/min on an other surface of the PTFE based membrane, and enabling the other surface of the PTFE based membrane to generate an activated structure layer;
• and
• applying a high-toughness cold bonding adhesive tape on the activated structure layer with a mechanical adhesive applying device, wherein a functional group of an adhesive in the high-toughness cold bonding adhesive tape is chemically bonded to the activated structure layer to form the PFFE-based membrane for bonding;
• wherein,
• preparing the high-toughness cold bonding adhesive tape comprising the following steps:
• adding 0.2 kg of a partially hydrolyzed polyvinyl alcohol, 18 kg of butyl acrylate, 0.5 kg of acrylic acid, 1.0 kg of vinyl acetate, 1.0 kg of methyl methacrylate, 1.5 kg of an organosilicone monomer, 0.01 kg of a nonionic surfactant based on iso-C13-alcohol, 0.01 kg of sodium dodecylbenzenesulfonate, 0.05 kg of benzoyl peroxide and 80 kg of water into a preparation tank for preparation at a temperature of 85° C. for 5 h, vacuuming and removing water, obtaining the adhesive in the high-toughness cold bonding adhesive tape with a solid content of 18.7%, complexing the adhesive on a release paper and rolling the release paper on a PVC tube core.