Adhesives are also called adhesives. A wide variety of adhesives are used in a wide range of applications, one of which is in the field of pharmaceuticals or food packaging, such as the compounding of medical plastic film with aluminum metal, compounding with plastics, and the hot pressing of pharmaceutical aluminum foil with PVC. Adhesives.
The basic requirements for adhesives for pharmaceutical packaging: good safety and hygiene performance, excellent adhesive properties, good heat resistance, chemical resistance, excellent resistance to media, and good softness.
Types of adhesives for pharmaceutical packaging:
â—‡Pressure-sensitive and polyurethane adhesives
Early pressure-sensitive adhesives were based on natural rubber. The main components of pressure-sensitive adhesives include synthetic resin adhesives, tackifiers, plasticizers, antioxidants, stabilizers, crosslinking agents, colorants and fillers.
With the continuous improvement of the hygienic performance requirements of pharmaceutical packaging materials, natural rubber additives added odor, and some toxic, have not been used in pharmaceutical and food composite packaging. However, acrylic pressure-sensitive adhesives still have certain advantages, such as being mono-component, not cross-linked and cured, not having to be glued, and being easy to use. Unfinished adhesives will not ring overnight or longer. Sealed without leakage can be saved. In addition, the surface state of the adherend is excellent, and many non-polar materials such as plastics, metal materials, and small surface tension can also be adhered. Companies have begun to switch to two-component polyurethane adhesives for the compounding of polar plastic materials and non-polar materials.
â—‡ Polyurethane Adhesives Polyurethane adhesives are highly elastic and have better heat resistance, solvent resistance, cold resistance, chemical resistance, oxidation resistance, and ozone resistance than other flexible adhesives. It has very good affinity for metals, plastics, wood, rubber, and fabrics, so it is widely used, and it is widely used in the fields of medicines and food packaging. The most widely used is the combination of plastics and plastics, metal and plastics, and blister packaging.