Nano Packaging and Technology Applications (2)

Nano antibacterial agent

MOD series nano high-performance inorganic antibacterial agent is a new type of inorganic antibacterial packaging material that introduces nano technology into aseptic composite packaging. It uses MOD active gene and inorganic nano silver compound as main antibacterial component, and uses various inorganic materials as carrier. Inorganic antibacterial powder. The antibacterial material is prepared by using high-tech nanotechnology, which changes the traditional antibacterial agent production process using simple metal ions such as silver, copper, and zinc as antibacterial active ingredients. The antibacterial mechanism is metal ion action and photocatalysis, with strong long-lasting antibacterial function, antibacterial rate up to 99.9%, completely solve the problem of discoloration of inorganic antibacterial packaging materials in the application, is a non-toxic broad-spectrum antibacterial agent, Can be widely used in the production of liquid milk, beverage aseptic composite packaging products.

Nano-inorganic antibacterial agents fall into two categories. One type is metal nano oxides with antibacterial activity, represented by TiO2 and ZnO. They generate active oxygen in water and air under ultraviolet radiation, have strong chemical activity, and can react with various organic substances. As a result, most germs and viruses are killed. Therefore, it can be used to produce antibacterial fibers, antibacterial plastics, antibacterial glass, antibacterial ceramics, antibacterial building materials, and the like. Experiments have shown that coating a thin layer of TiO2 on the glass and light for 3 hours can achieve the effect of killing the coliform. After 4 hours of light exposure, the toxin can be controlled below 5%. The other type is a compound antibacterial body mainly composed of silver and zinc. With fine TiO2 and SiO2 as carriers, due to the special effects of ultra-fine nano-sized particles, the overall antibacterial effect is greatly improved, and the moisture resistance and powder are greatly improved. The fineness, dispersion, and functional effects have all been brought into full play. For example, nano-composite silver antibacterial powder MFS350 developed by Zhoushan Mingri Nanomaterials Co., Ltd. uses nano-SiO2 as the main raw material, and its average particle size is less than 90 nm, which is characterized by high efficiency, rapidity, long-lasting, and broad antibacterial spectrum.

The MOD nano high-performance inorganic antibacterial agent developed by Zhejiang Lishui Golden Asia Nanomaterials Co., Ltd. is a new type of inorganic antibacterial agent developed by combining photocatalytic antibacterial technology, metal ion antibacterial technology and nano preparation technology. And to stop the growth of bacteria and prevent the growth of various microorganisms, it also has the durability and safety of antibacterial action. Applying MOD to various materials can make many related products.

Japan adds a new type of inorganic antibacterial agent to the packaging material, and it is currently widely used as an antibacterial film. Pure natural base materials can exert amazing bactericidal effect under the transformation of nanotechnology. Antibacterial and aseptic packaging can denature or sediment the bacteria. Once it encounters water, it will exert greater destruction on the bacteria. The adsorption capacity and penetrating power are also very strong, and it also has a strong antibacterial effect after multiple washings. The antifouling film has an efficiency of more than 98% in the barrier aerosol, and the film has excellent air permeability, barrier, and filtration properties.

Nano coating

Nano coatings have varying optical properties, and their optical transmission spectrum extends from the ultraviolet to the far infrared. Nano-multi-layer composite coatings can exhibit fluorescence in the visible light range after being processed, and nano-material coatings are applied on the surface of various signs to become reflective signs. Changing the composition and properties of nano-coatings can produce photochromic, thermochromic, electrochromic and other effects, and is a special anti-counterfeiting and identification method.

Adding functional nanomaterials in traditional coatings can greatly improve the performance of coatings. Such as the nano-calcium carbonate added to the ink instead of barium hydroxide, barium sulfate, aluminum barium and other traditional ink filler (plasma pigment), can be made of good stability, high gloss, good drying performance, adaptability of nano-modified Ink. After adding a small amount of nano-SiO2 to traditional coatings (especially exterior paints), the anti-ultraviolet aging performance of the product has been increased from the original 250 hours to more than 600 hours; the scrub resistance has been improved from 1000 times to more than 10,000 times, and the drying time has been greatly reduced. The problem of poor suspension stability, poor thixotropy, and low finish is also greatly improved.

Two major application technologies of nano packaging materials

Nano coating technology

High barrier property is one of the basic functional elements of plastic packaging. PET is the preferred material for beverage packaging. It has many advantages such as good transparency, stable chemical properties, relatively good barrier properties, light weight, low cost, and recyclability. Therefore, PET is widely used. However, as a beer bottle, the gas barrier property of PET is still not high enough. Therefore, improving the gas barrier properties of polyester bottles is a primary solution to the problem of plasticization of beer packaging. Among the numerous process technologies, surface coating technology is the earliest, most widely used and most invested new process technology. Today, it has become the main means to improve the gas barrier properties of polyester bottles. In the surface coating technology, the nano-surface coating method is one of the effective methods.

Among the various surface technology coating methods, plasma nano-coating technology has the greatest market potential, and it is also a hot spot for modern development. The plasma nano-surface treatment research began in the late 20th century. It is a vacuum dry-type treatment process. It has the advantages of easy operation, cleanness, high efficiency, safety, and no pollution, and can meet environmental protection requirements. The thickness of the plasma surface treatment coating is nano-scale, and the physical properties of the material interface are significantly improved while ensuring that the material substrate is not adversely affected.

Amorphous nano-carbon coating technology (ACTIS) developed by France's Sidel company is to make plasma acetylene agglomerate on the inner wall of PET bottles to form a highly hydrogenated amorphous carbon nano solid film with a thickness of 20~150 nm. The PET bottles treated with the ACTIS process have 30 times more effective oxygen barrier than ordinary PET bottles, 7 times more resistance to CO2, and 6 times more resistance to acetaldehyde. The diamond-based nanocarbon coating process (DLC) uses high-frequency vacuum discharge to form a fine coating of 20 to 40 nm in thickness on the inner surface of the PET bottle, similar to the diamond carbon structure. The PET bottle is more than 20 times more resistant to oxygen than normal PET bottles, 7 times more resistant to CO2, 8 times more resistant to water vapor, and also significantly improved in UV resistance.

The silicon oxide nano-treated PET bottle technology adopts SiO2 for vacuum physical vapor deposition under high vacuum plasma conditions, and the treatment layer is outside the PET bottle. The processing cost of this method is more economical than using PET bottles or multilayer bottles.

DuPont Polyester (DU PONT) has developed a new two-stage overcoating technology to increase the barrier properties of PET bottles to O2 and CO2 by 30 times. The primer can be separated by water and the material recovery is very high. Convenient, is an excellent green packaging.

Nano Additive Technology

With the rapid development of packaging, the increase in demand for special functions of packaging, such as explosion-proof, anti-electromagnetic, camouflage, high barrier, and UV-resistant packaging, has prompted the development of nano-packaging technology. The nano-composite nano-packaging material is a high-tech material. If 10% nano TLMC (thermotropic liquid crystal polymer) is added to the high molecular polymer, the tensile strength of the material will be increased to 450 MPa, thereby greatly expanding its use and saving scarce resources.

In May 2004, the British company Foraday announced that in order to cooperate with the environment, they will use nanotechnology in the ultrathin layers of polymer molecules. In the future, this product will provide new functions for packaging materials. This study is closely related to physics and chemistry. Chemists have found a way to make polymer layers one molecule thick, while physicists study the properties of each layer at the level of a single molecule. These results will enable individual molecules to react according to the environment, protecting the product based on changes in temperature and humidity.

Nano-preservation packaging materials can improve the fresh-keeping effect of fresh fruits and vegetables and extend the shelf life. Adding nano-silver powder to the fresh-keeping packaging material can accelerate the release of ethylene from the oxidized fruits and vegetables and reduce the ethylene content in the package, thereby achieving a good preservation effect. The application of nanotechnology in UV protection materials, such as the addition of nano-UV protection powder in UV protection packaging materials, makes the manufactured UV protection packaging bags achieve better UV protection.

Metal nanoparticles have the special function of eliminating static electricity. As long as a small amount of metal nanoparticles is added during the production of packaging materials, static electricity can be eliminated, so that the surface of the package will no longer absorb dust and reduce friction-induced scratches, while printing, Due to the absence of electrostatic adsorption on the surface, it helps to increase the printing speed and improve the printing effect.