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4. The fragile and non-toxic packaging containers are endowed with tough ceramic containers and glass containers, which are two traditional packaging containers. Due to their non-toxic, sealed and smooth surfaces, they have occupied an important position in the packaging industry. They have the disadvantage of being fragile and inconvenient to handle and have now been replaced by some metal packaging. In recent years, countries such as Western Europe, the United States, and Japan have developed nanotechnology and added nanoparticles to ceramics or glass to obtain tough ceramics or glass materials. For example, the United Kingdom mixes nano-alumina with zirconium dioxide and has obtained high-toughness ceramic materials in the laboratory. As another example, Japan added aluminum oxide nanoparticles to ordinary glass, significantly changing the brittleness of the glass. The breakthrough of these technologies has brought hope to scientists who have struggled for toughening ceramics and glass for nearly a century, and has brought new hope to our revitalization of the ceramic packaging and glass packaging industry.
5. The anti-counterfeit packaging has entered into a new phase of nanomaterials with excellent sensitivity, and has broad application prospects in terms of temperature sensitivity, gas sensitivity, moisture sensitivity, etc. It is utilized and developed in anti-counterfeiting packaging, which will enable anti-counterfeit packaging technology to enter into a A new stage.
The sensitivity of the nanoparticles can be used to prepare temperature (heat) sensitive materials, gas sensitive materials and moisture sensitive materials, respectively, and then used as anti-counterfeit packaging.
The general metal particles are black and have the characteristics of absorbing infrared rays, and have large surface area, high surface activity and sensitivity to the surrounding environment (temperature, heat, light, humidity, etc.). Therefore, when the nano-particles with these characteristics are added into the packaging material, or made into a coating or a polishing agent, they are applied to the surface of the material and used for product packaging. When people select a product, they can be identified by heat, light, or humidity to achieve anti-counterfeiting. This means that the use of nanotechnology can achieve color anti-counterfeiting, physicochemical effects anti-counterfeiting and Other purposes.
6. Making fresh-keeping packaging more effective and simplistic. At present, the research and development of fresh-keeping packaging are inefficient and the process is very complicated. The relative cost during the packaging operation and storage is high. With nanotechnology, these problems will be solved.
When we researched the fresh-keeping packaging of fresh fruits and vegetables, we discovered that there is a gas substance that accelerates deterioration of fruits and vegetables. This gas substance is ethylene. In fresh-keeping packaging, fruits and vegetables release ethylene. When the concentration of ethylene reaches 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 package to improve the preservation effect and extend the shelf life. . However, tests have shown that the effect of the ethylene absorbents found so far is not ideal, which has led to difficulties in the research of fresh-keeping packaging. However, just nano-sized Ag powder has a catalytic effect on ethylene oxidation, that is, nano-Ag powder can be used as a catalyst for ethylene oxidation. Adding nano-Ag powder to the fresh-keeping packaging material can accelerate the oxidation of ethylene released from fruits and vegetables and reduce the ethylene content, so as to achieve a good preservation effect. The nanoparticles used as oxidation catalysts mainly include Fe3O4, Fe2O3, Co3O4, NiO, and Pt, Rh, Ag, Pd, and the like.
The use of nano-technology packaging containers with clean sterilization and preservation. For example, nano-TiO2 catalyzes hydrocarbons under the irradiation of visible light. This effect can be used to coat nano-TiO2 on the surface of materials such as glass and ceramics, which can produce good cleaning and sterilizing effects. Japan has already done so in this area. Successful experiment. As long as a thin layer of nano-TiO2 is coated on the surface of glass and ceramic materials, any substances that adhere to the surface, such as oil, bacteria, etc., are catalyzed by TiO2 under the irradiation of light, and these hydrocarbon substances are further oxidized and changed. It is a gas or a material that can be easily wiped off and has a clear bactericidal effect.
7. Nanotechnology can greatly improve the performance of plastic packaging materials. Nanoparticles have the ability to absorb ultraviolet light. Plastic packaging products are susceptible to ageing and brittleness under ultraviolet light irradiation. If a transparent coating containing nanoparticles is coated on the surface of the plastic packaging material, the coating has a strong UV absorption capability in the range of 300 to 400 nm. Can prevent the aging of plastic packaging, and greatly increase the use of plastic packaging (such as packaging, large equipment, wrapping, etc.) and life.
There are two types of packaging materials that are good for UV absorption. One is a 30-40 nm TiO2 nanoparticle resin film; the other is a Fe2O3 nanoparticle-containing alcohol resin film. The former has a strong absorption capability for ultraviolet rays within a wavelength of 400 nm, and the latter has a good absorption ability for ultraviolet rays within a wavelength of 600 nm. The nano-technology light-absorbing material will become a good alternative to traditional packaging materials, creating technical conditions for the modification and functional protection of packaging materials.
8. The processing performance of packaging containers has greatly improved the metal cans used in various types of beverages and food packaging in China. The domestically produced materials have always had the problems of poor toughness and poor ductility, and processing technology is prone to cracks and other technical problems, making us a lot of metal packaging containers (cans, boxes, Barrels, cans, etc.) The raw materials used need to be imported. If nanotechnology is used, the addition of nano-particles to can-making metal materials can greatly increase the toughness and ductility, greatly reduce the forming process of packaging containers, and increase their reliability and yield.
IV. Reflections and Suggestions At present, nanotechnology is in the early stage of major breakthroughs. Its future, its role and impact have been discovered and shocked by people. Now it has attracted worldwide attention.
The prospect of nanotechnology is the same as that of Amstrong, the chief scientist of IBM Corporation in the United States: "Like the information revolution created by the microelectronics technology in the 1970s, nanoscience and technology will become the core of the information age in the next century." Qian Xuesen, a well-known scientist in our country, also predicted that “the structure of nanometer and nanometer is the focus of the next stage of scientific and technological development. It will be a technological revolution and will be another industrial revolution in the 21st century.†It is not difficult to predict that nanotechnology will become 21 Century's scientific frontier and leading science.
With regard to the basic research on nanotechnology, our country has reached an international advanced level in some aspects. As our area of ​​packaging, we are applying nanotechnology, developing nano packaging technology and nano packaging materials. In the past, some of our advanced packaging equipment, advanced materials, and advanced technologies in the packaging industry relied heavily on imports. We didn't have much to call technology. The emergence of nanotechnology has brought opportunities for our packaging industry and technological innovation. Relevant organizations and departments should set up research institutions for nano packaging technology and materials in order to accelerate the process of technological innovation.
The entire packaging industry focuses on packaging materials and packaging technology. The application of nanotechnology in packaging is still at a blank. In today and the future of joining the WTO, whoever wants to work hard in this area will be able to occupy the "commanding heights" of the packaging field in the 21st century and will be in the future competition. Advantage.
Packaging and Nanotechnology (below)
3. Replacing Traditional Chemical Pigments to Produce Advanced Printing Inks As early as 1994, the American company XMX Corporation of Massachusetts applied for and obtained a patent for the production of uniform ink nanoparticles for printing inks. The company is preparing to design and manufacture a commercial production system that will no longer rely on chemical pigments, but rather choose the right nanoparticles to get a variety of pigments to produce advanced printing inks. Nanotechnology has created conditions for the production of high-grade printing inks.