Application of Nanotechnology in New Packaging Materials (2)

(B) Nano-type antibacterial packaging materials

The production of nano inorganic antibacterial agents in China]: and the use of technology in the international advanced level, its characteristics: the long-term antibacterial ability; antibacterial properties of a wide spectrum, excellent killing rate; antibacterial agent for human and animal safety; antibacterial products, physical and chemical properties of stable Antibacterial agent has low cost

1. The new antibacterial material is a special nano-adhesive composite material in nylon 66. After modification, it not only improves the physical and mechanical properties such as strength and toughness, but also has significant killing effect on Escherichia coli and Staphylococcus aureus. At the same time, production costs can also be greatly reduced. The key to this product is to obtain structural and performance performance and establish predictable response through the improvement of various influencing factors in the reaction process (temperature pressure, degree of conversion, time, gel point, etc.) and reaction thermodynamics, kinetics, and parameter data. The model is widely used in the production of high-grade packaging films such as machinery, electronics, building materials, and foods.

2. Nano-antibacterial packaging materials impart certain antibacterial properties to plastic packaging materials. Japan developed a new type of inorganic antibacterial agent using silver zeolite as a master batch, which not only acts as a catalyst, but also has significant antibacterial properties. Its characteristic is that the antibacterial effect lasts for a long time, and it will not affect the packaging due to gasification and migration. , high processing stability, will not pollute the environment. The film obtained with the silver zeolite masterbatch added (content 1-3%) or the container covered with a layer of this film, after two years of trial shows: in the absence of nutrients, including. The film of 1% silver zeolite can completely kill the bacteria that can cause food poisoning in 1-2 days, and is widely used in the packaging of cooked meat, aquatic products and liquid foods.

3. Hollow nano-efficient bactericidal material: In the hollow nano-materials using special process complex bactericidal composition, can produce efficient, safe, broad spectrum as one of the hollow nano-efficient bactericide, due to the special properties of hollow nano-materials, fungicides can be Heat-resistance 650~(2, lasting effect, one-time use, life-long bactericidal function. Product measured by West China University of Medical Sciences, sterilization capacity compared with similar products in Japan and domestic as shown in the table below.

4. The existing fresh-keeping techniques and processes are very complicated, and the fresh-keeping packaging has poor results, and the relative cost during the packaging operation and storage and transportation is relatively high. With nanotechnology, these problems are solved. The fresh-keeping packaging of fresh foods such as fruits and vegetables is to solve the problem of accelerating the deterioration of the gas-substance ethylene of fruits and vegetables. In the fresh-keeping packaging, the fruits and vegetables will release ethylene. When the ethylene is released to a certain concentration, the fruits and vegetables will accelerate rot. Therefore, ethylene absorbers should be added to the fresh-keeping packaging to reduce the ethylene content in the packaging to improve the freshness and extend the shelf life. . However, the experimental results show that the ethylene absorbents currently sought are not satisfactory, which makes the research of fresh-keeping packaging problems. Nano-Ae powder has a catalytic effect on the oxidation of ethylene. Adding nano-Ag powder to the fresh-keeping packaging material can accelerate the oxidation of ethylene released from fruits and vegetables, reduce the ethylene content, and thus achieve a good preservation effect. The nanoparticles used as oxidation catalysts mainly include Fe304, Fe203, C0304, Nio, and PI, Rh, As, Pd, and the like. The use of nano-technology packaging containers have the function of cleaning and sterilizing.

(C) Nano-functional (smart) packaging materials

The use of nanotechnology to select atomic constituent molecules, to create a variety of new materials with special functions, and then add these new functionally specific materials 1. The high barrier properties of nano-packaging composites will be favored and valued in the packaging industry because these materials are firstly well-suited for so-called barrier packaging. This type of barrier packaging has a wide range of applications. It will be used in the packaging of foods and pharmaceuticals, precision mechanical parts, and electronic and electrical components, as well as sealing cap liners.

2. In the thin-film ceramics, when the silica particles are reduced to the nanometer level, the brittle ceramics actually have toughness and look like normal paper. With cutting, folding; printing and paper are generally no different nature, and the extension of the same with the metal sheet, can be stamped and formed multiple times, can be used as a thermal container.

3. The new type of composite paper was successfully developed by the former Soviet Union scientists. The “paper” was made of basalt in high temperature 2000~C; the film was made by impregnating phenolic resin and infiltrating the white clay powder, and the long-term storage will not become brittle, nor Hair enzymes, no worms, can print color.

4. In the form of electronic paper, it is necessary to combine repeatable recording, modification, and paper-like displays. Based on the principles of thinness, lightness, power saving, and portability, the basic materials used in electronic paper are clustered compounds. Silicone circuits are printed so that changes in surface charge can be controlled. There must be a more reasonable specific range of electronic paper that can replace some of the plain paper, but it is still necessary to reduce costs before it can move toward commercialization.

(to be continued)