Anti-static packaging materials can be divided into antistatic agent processing type, conductive material filling type, plating type, coating type, surface modification type, according to different process methods for obtaining antistatic function according to the material thereof. Structured conductive polymer.
(1) Antistatic agent treatment type for antistatic packaging materials
The surface of the packaging material is treated with an antistatic agent or subjected to a deep composite treatment to reduce the electrical resistance of the original material and improve the electrical conductivity, thereby achieving the purpose of eliminating static electricity. In general, the antistatic agent has a simple process, low cost, convenient production, and no special requirements on equipment, and thus occupies a certain position in actual production.
(2) Conductive material filled type of antistatic packaging material
The so-called conductive filler is a kind of substance that can impart electrical conductivity. There are many types according to their performance, namely, metal, carbon, metal oxide, metallized fiber, and organic polymer.
(3) Plating type of antistatic packaging material
To form a layer of conductive metal plating on the surface of the polymer filler, electroplating, electroless plating, physical vapor deposition, chemical vapor deposition, thermal spraying and the like are generally employed.
(4) Coating type of antistatic packaging material
By using a coating technique, a conductive coating is applied on the surface of the insulating polymer material to form a uniform coating layer, thereby imparting electrical conductivity to the material having an antistatic function. Materials using this type of process are coated antistatic packaging materials.
(5) Surface modification type of antistatic packaging materials
In the graft copolymerization, the monomer mixture is irradiated with radiation to obtain good antistatic properties. For example, in recent years, after treatment of acrylic acid or methacrylic acid with β-ray irradiation, grafting onto polyethylene or polypropylene, irradiating the polyamide with γ-rays and then grafting methacrylic acid can make them antistatic properties. Significantly increased.
(6) Composite type of anti-static packaging materials
Composite antistatic packaging materials have been widely used as packaging bags. The structural feature is that there are often 3 to 4 barrier shielding layers in the middle, and the antistatic film antistatic film is generally used for the outer surface (inner) layer. This is the mainstream of the current popular, and is also the development direction of anti-static bags in the future.
(7) Structural type of antistatic packaging materials
This is a new kind of polymer material. They have the same molecular structure of π electrons as the metal free electrons through the action of their own chemical structure. The electron motion is conductive through the π-conjugated system, and then chemically. Doping to increase its conductivity.
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