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Adhesive body of polypropylene and polyethylene treated by plasma cleaning machine:
Polypropylene (PP) and polyethylene (PE) plastics have excellent performance and low cost, so their films and sheets are widely used in various industries. In many cases, plastic products such as PP and PE need to undergo secondary processing such as bonding. The emergence of plastic composite laminates is of great significance to the functional requirements of cars, aerospace vehicles, electronic equipment, and lightweight, shock absorption and vibration reduction. How to obtain PP and PE plastics with high surface polarity and good bonding properties to ensure sufficient bonding strength between different materials is an important technical requirement.
Treated with a plasma cleaning machine, the plasma can chemically react with the surface of PP and PE, introducing a large number of oxygen-containing groups and changing its surface activity. The use of plasma cleaning machine can improve the surface energy of the material and the contact angle of the surface through surface cross-linking and etching.
Plasma treatment can modify the surface of plastic products such as polyethylene and polypropylene. After plasma treatment of PP plastic and PE plastic, the use of moisture-curing one-component polyurethane for hybrid bonding, the test found that the shear strength increased significantly. When the plasma high-energy particles hit the surface of the material, the electron energy is between 5-10 eV. The plasma high-energy particles transfer their own energy to the surface molecules, breaking the molecular bonds in the polymer, and then etching, cross-linking, and chemical A series of changes such as reaction, thereby changing the surface chemical composition and properties of the plastic sheet.
The surface of the untreated sample is relatively smooth, but the surface of the sample becomes loose after plasma discharge treatment, and the roughness of the plastic surface is increased, thereby reducing the contact angle and improving the capillary effect of the plastic surface. In addition, when the polymer after plasma treatment is generally in contact with air, the active free radicals on the polymer surface will introduce oxygen or nitrogen-containing electrodes such as -COOH, -C=O, -NH and -OH on the surface.性组。 The group.
They have strong reactivity. These groups can react with other compounds to introduce the required functional groups to functionalize the polymer surface. The surface properties of PP (PE) after plasma treatment by a plasma cleaner are improved, thereby increasing the shear strength of the PP and PE mixed bond.
The surface of the plastic is activated, so that the wettability of the plastic surface is greatly improved, and the shear strength of the mixed adhesive of PP and PE plastic is greatly improved.
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