1, the bonding strength of aluminum honeycomb core produced by epoxy film process is low, for the honeycomb core side length of 4mm, the panel thickness of 1mm, the total thickness of 10mm aluminum honeycomb core measured 180° peel strength is about 4N/mm, but its bonding. The performance has good weather resistance, and the peeling strength decreases little after 1 year of use. The disadvantage is that the bonding layer of the aluminum honeycomb core is brittle, and the aluminum honeycomb core will be stratified after long-term vibration.
2, with polyurethane, epoxy resin room temperature curing adhesive production of aluminum honeycomb core, its bonding strength is low, for the honeycomb core side length of 4mm, panel thickness of 1mm, the total thickness of 10mm aluminum honeycomb core measured 180° peel strength is about 4N/mm. The bonding property and weather resistance of the aluminum honeycomb core are poor, and the bonding property decreases significantly after 1 year of use. The aluminum honeycomb core produced by this process is not suitable for outdoor use, but can be used indoors as decorative partitions.
3, the adhesive strength of the aluminum honeycomb core produced by the thermoplastic film continuous composite process is 3-5 of the aluminum honeycomb core produced by the first two processes, for the side length of the hexagonal honeycomb core is 4mm, the panel thickness is 1mm, the total thickness of 10mm aluminum honeycomb core, the measured 180° peel strength value is about 18N/mm. It has good adhesion and weather resistance, and its peeling strength decreases little after 1 year of use. Because of the continuous production, high efficiency, can meet the short-term mass supply requirements. The disadvantage of this process is that the flat continuous thermal compounding machine equipment used is high in price and the investment is large. Thermoplastic film is a special hot melt film, the film itself must have a high cohesion strength and tensile strength, so as to ensure the bonding of aluminum honeycomb core. If the general hot melt film is used, its bonding strength is very low, and the 180° peel strength value jin is 3N/mm.
4, the surface condition of aluminum: if the surface of the aluminum honeycomb core itself has a lot of oil or dirty things, then after a long time of oxidation, the potential will affect the adhesion of the aluminum honeycomb core. Therefore, before using aluminum honeycomb core, it is necessary to clean its surface.
