METHOD OF ACTIVATING SURFACE OF PTFE-BASED MEMBRANE AT NANO-DEPTH Russian patent published in 2024 - IPC C08F14/26 B29K27/18 B29C71/00 B29L7/00 B32B33/00 

FIELD: adhesive materials.

SUBSTANCE: present invention relates to a method for activating the surface of a PTFE-based membrane at nano depth, involving: coating of a functional surface of a membrane from a functional nanocomposite based on PTFE with a nano- and micron concave-convex geometric ultramicron structural morphology, processing for surface activation in vacuum medium and in atmosphere of nitrogen-hydrogen mixture medium at temperature below 40 °C at rate of 1.5–3 m/min on one surface of the membrane, on which a binding adhesive is applied, and allow the surface of the membrane with the applied adhesive to form a structural layer activated at the nano-depth; as well as transferring and combining a high-strength adhesive tape with a cold adhesion function on the surface of the membrane with an activated structural layer of the membrane from a functional nanocomposite based on PTFE using a device for mechanical application of the adhesive, and allowing the functional group of the adhesive and the activated structural layer of the membrane to establish a chemical bond to form an adhesive-membrane complex; wherein the high-strength adhesive tape with a cold gluing function is obtained using the following steps, at which 0.2 kg of “ПВА-1788”, 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 organosilicon monomer, 0.01 kg of TO-7, 0.01 kg of sodium dodecylbenzene sulphonate, 0.05 kg of benzoyl peroxide and 80 kg of water in a preparatory container for preparation at temperature of 85 °C for 5 hours, vacuum treatment is carried out and water is removed to obtain a pressure-sensitive tape with content of solid substances of 18.7 wt.%, the pressure-sensitive tape is combined with release paper and the release paper is wound on the core of the PVC pipe.

EFFECT: activation of the surface of the PTFE-based membrane at nano-depth with increase in the bonding strength, the peeling force and the duration of the bonding force of the adhesive.

5 cl, 2 dwg, 1 ex