Nanotechnology Brings a New Look to the Packaging World (2)

Nanotechnology applied in packaging

Nanotechnology that can be applied in the field of packaging: nano ink, nano paper, polymer based nano composite (PNMC), nano antibacterial packaging, nano plastic packaging, nano adhesive, nano security printing, nano military protective packaging, nano green Packaging, nano-magnetic printing and so on.

Nano ink

Nanotechnology brings a huge change to the ink manufacturing industry in terms of pigments, so that the ink is no longer dependent on chemical pigments, but can choose the appropriate volume of nanoparticles to present different colors, such as TiO2, SiO2 nanoparticles are white, Cr2O3 Green, Fe2O3 is brown.

Inorganic nanomaterials such as A12O3 have good fluidity, and if added to the ink, the abrasion resistance of the ink film can be greatly improved.

Nano-scale carbon ink is conductive and has a good shielding effect against static electricity. It can prevent electric signals from being disturbed by external static electricity. If it is added to ink, it can be made into conductive ink, such as large-capacity integrated circuits, modern contact panel switches. Wait. If Ag is made into nano-scale instead of micro-sized Ag in conductive ink, 50% of Ag powder can be saved. This conductive ink can be directly printed on ceramic and metal, and the ink film is thin and even and smooth. If the Cu, Ni material is made of nano-scale ultrafine particles, it can replace palladium and silver and other precious metals conductive.

Because the nanoparticles have good surface wettability, they are adsorbed on the surface of the ink pigment particles, can greatly improve the ink's lipophilicity and wettability, and can ensure the stability of the entire ink dispersion system, so the nanoparticles added with nanoparticles The ink has been greatly improved in printability. In electrostatic copying, the use of magnetic nanopowders instead of non-magnetic toners, which are widely used today, can eliminate the need to add ferromagnetic particles as a carrier in the latter, thereby producing a single-component copying developer, which can save raw materials. , And can improve copy quality.

Because of the poor lightfastness of fluorescent anti-counterfeiting inks and the fact that the anti-counterfeiting mechanism has been deciphered and the anti-counterfeiting function has been lost, the nano-anti-counterfeiting inks that have been successfully researched by Guangzhou University for near-infrared absorption have demonstrated reliability, safety, stability, and aging resistance in small-scale test samples. Both have reached a satisfactory level. At present, this product has been used in high-tech fields such as packaging, ticket security and infrared sensors.

Nano plastic

The so-called "nanoplastic" refers to an organic/inorganic nanocomposite material in which an inorganic filler is dispersed in a nanometer size in an organic polymer body. The raw material used for nano-plastics is "montmorillonite", a type of natural clay mineral produced in China and a layered silicate. Filling and modifying plastics can improve the mechanical properties of plastics, and can also develop various functional plastics, such as conductive plastics, magnetic plastics, anti-degradable plastics, anti-ultraviolet and anti-aging plastics. The nano-plastics made of inorganic nano-materials uniformly dispersed in plastic have excellent physical and mechanical properties, high strength, good heat resistance, low density, good transparency, and high gloss.

Although the use performance of nano-plastics has been greatly improved, in appearance, nano-plastics are no different from ordinary plastics. Because nanometers are dispersed, its size is similar to the wavelength of visible light, so nano plastics are usually colorless and transparent, and a small amount shows milky white, but it does not affect its use. In addition, the amount of nano inorganic particles is very small, generally 2% to 5%, only about 1/10 of the amount of common inorganic filler, so the density of nano plastics is almost constant or increase is very small, will not increase due to density increase The cost of plastics processing will not cause other performance degradation due to too much filler. Due to the small size of the nano-particles, almost no breakage breakage occurs during molding and recycling, and it has good recyclability. The preparation process of nano plastics is not complicated, and the production process of common plastics can be slightly improved, so the nano plastics have a better performance-cost ratio than ordinary plastics.

Polyester PET nanoplastics, with excellent barrier properties, rapid crystallization properties, and excellent melt strength and stability, can replace the expensive polyethylenformate (PEN) resin. And in line with food packaging requirements, can be directly used to blow beer, cosmetics bottles. PET bottles are often used for filling liquid items (such as cola, juices, sodas, etc.). Common PET has poor heat resistance, cannot be hot-filled, and has poor barrier properties against oxygen and carbon dioxide gas. Nano-PET bottles overcome these shortcomings and can be used to directly fill hotter edible liquids, as well as beer, pesticides and other items. Nano-PET is much lighter than glass, and it is not easy to break. Even if it is explosive, it is less dangerous and it is convenient for transportation and storage. It can also be reused after high-temperature pasteurization, avoiding the production of glass bottles and the environment during waste disposal. Pollution. At present, three-layer composite materials of nano-PET and nano-nylon have been used to prepare beer and juice packaging bottles with high heat-resistance and gas sealing performance requirements.

Nylon 6-nanometer plastics are mainly used for high-grade packaging film materials.