Application of Nano Antibacterial Materials in Packaging Industry (1)

1. Nano-antibacterial packaging materials The so-called nano-packaging materials are nano-composite packaging materials with nano-scale structural units made of particles or crystals with a dispersed phase size of 1 mm to 100 mm that are composited or added with other packaging materials. Nano-antibacterial materials are a new class of materials with antibacterial properties. Since the materials themselves impart antibacterial properties, they can keep the growth and reproduction of microorganisms including bacteria, fungi, yeasts, algae, and viruses at a low level. All kinds of products made of antibacterial materials have hygienic self-cleaning function and can effectively prevent the spread of bacteria. Nanostructures may become the basis for technological improvements. Once the critical dimensions of a material can be controlled, the critical dimensions of a new material can also be used to enhance the properties of new materials and the functions of the device beyond what we believe may be achieved. . As we studied, the nanoinorganic antibacterial agents can withstand the high temperature of 1300°C without losing their antibacterial effect.
One of the ways that humans infect bacteria is through the entrance of food, and food packaging materials are generally in direct contact with food. Food-rich nutrients become a nutrient source for breeding of microorganisms in high-temperature packaging environment. Therefore, the development of food packaging materials with antibacterial and preservation functions is very important. At present, there are many kinds of antibacterial materials, which generally include antibacterial plastics, antibacterial fibers and fabrics, antibacterial ceramics and antibacterial metals. Antibacterial materials are generally prepared by adding an antibacterial agent to the substrate in a suitable manner or on the surface of the substrate. Therefore, it can be said that the quality of the antibacterial material ultimately depends on the development of the antibacterial agent.
Although there are many varieties of antibacterial agents and they are widely used, the daily use of disinfectants can only produce short-term effects and are harmful to human health. Therefore, the development of new antibacterial materials has never stopped. The requirements for antimicrobial agents should not only be non-toxic, harmless, and long-lasting, but also have an important development trend.
Antibacterial materials are divided into organic antibacterial materials, inorganic antibacterial materials and natural antibacterial materials. Organic antibacterial materials are harmful to the environment and human body and have a short working life, and the use temperature is lower than 300°C; inorganic antibacterial agents overcome the above disadvantages.
Packaging is the largest plastic product use industry. Antibacterial packaging is very useful for food quality and prevention of foreign pollution. After Japan's nationwide e-E. coli pollution caused food poisoning in 1996, antibacterial materials have developed rapidly. One of the applications is food packaging. Food packaging must be inspected and determined in strict accordance with the requirements of food hygienic packaging.
Packaging after harvesting fruits and vegetables is an important part of maintaining and improving the value of fruits and vegetables. It is necessary to use comprehensive adjustment techniques to extend the storage period of fruits and vegetables to meet the needs of storage and long-distance transportation of fruits and vegetables. Among them, the use of antibacterial materials and antibacterial technology can prevent mold and other microorganisms from invading the fruits and vegetables and achieve better preservation. Antimicrobial and anti-mildew packaging of certain products also has very good economic and social benefits, such as export clothing, optical equipment and so on.
In the practical application of antibacterial materials, the necessary selection of antibacterial agents should be performed according to the requirements of the material's use and processing methods. The main considerations are: The antibacterial effect is mainly determined by the mic value (the smallest antibacterial agent that hinders bacterial reproduction Concentration) The smaller the mic value, the better the antibacterial effect. For antibacterial materials added with antibacterial agents, the antibacterial ability of the antibacterial materials is mainly dependent on the antibacterial agent on the surface of the material. Therefore, the added amount is generally higher than the mic value.
Different antibacterial agents have different antibacterial activities for different bacteria, that is, the antibacterial agents only exhibit antibacterial activity against specific bacteria. When choosing an antibacterial agent, the antibacterial range of the antibacterial agent should be considered, and the antibacterial range is, of course, wider and better. . However, it is also possible to reconstitute several different antibacterial agents in order to achieve the desired antibacterial range.

As a food packaging material, the selection of antibacterial agents must be harmless to the human body, and the use of antibacterial agents that have acute toxicity, chronic toxicity, large odor, and irritation to the skin should be avoided. From this point of view, the use of organic antibacterial agents has great limitations, and inorganic antibacterial agents and natural antibacterial agents have become a hot topic of application because of their safety.