Application of the hottest nanoparticles and nanot

2022-08-22
  • Detail

The application of nanoparticles and nanotechnology in packaging and printing industry (Part 2)

the application of nanotechnology in packaging industry

because nanoparticles have many special properties, nano 3. Spray free modified engineering plastic nanotechnology is playing a huge role in the packaging industry in all aspects:

1. Packaging materials

(1) adding nano titanium dioxide and other particles to packaging materials can produce odor elimination Sterilization can improve packaging quality and prolong shelf life. Nano layered silver inorganic antibacterial materials can be used in antibacterial and deodorizing plastic products, antibacterial paper cups and many other products. The 30 ~ 40nm titanium dioxide is dispersed into the resin to make a UV absorbing film with strong light absorption ability, which can be used in food sterilization bags and fresh-keeping bags

(2) nano coatings have variable optical properties, and its optical transmission spectrum can be extended from UV band to far-infrared band. After treatment, the nano multi-layer composite coating appears fluorescence in the visible light range, and nano material coating is applied on the surface of various signs to become luminous and reflective signs; Changing the composition and characteristics of nano coatings to produce photochromic, thermochromic, electrochromic and other effects is a special means of anti-counterfeiting and identification

(3) nano materials such as nano titanium dioxide and nano calcium carbonate can modify plastics. By filling and modifying plastics, the mechanical properties of plastics can be improved, and various functional plastics can be developed, such as conductive plastics, magnetic plastics, anti degradation plastics, anti UV aging plastics, etc. Nano plastics made by uniformly dispersing inorganic nano materials in plastics have excellent physical and mechanical properties, high strength, good heat resistance, low density, good transparency and high gloss

(4) use nano silica series particles as reinforcing agent and anti-aging agent of rubber; Using nano alumina can greatly improve the wear resistance and dielectric properties of rubber, significantly prolong its service life and greatly improve its performance

(5) using cheap silicon-based compounds as raw materials, abnormally fine colloidal particles (SOL) are connected together (gel), so that the liquid becomes solid, and sol-gel glass is generated. The quality of this glass is only half that of ordinary glass; 80nm yttrium oxide can be used as infrared shielding coating, which has high efficiency of reflecting heat. Coating nano material coating on the surface of products such as glass can reduce the transmission and heat transfer effect of optomechanical testing machine limited by structure and inertia force, and produce heat insulation effect

(6) because ceramic materials are usually brittle, nano ceramic materials pressed by nanoparticles have good toughness; The ceramic is processed into nano powder, and it can be melted and sintered at a low temperature; Nano alumina is added to ceramics to strengthen and toughen, so as to improve the reliability of ceramic materials; In addition, there are ceramics with high thermal conductivity, such as diamond and aluminum nitride

(7) nanocrystalline metals are 3-5 times harder than traditional coarse-grained metals. The nano iron material is made of the pressed surface of nano iron crystal. Compared with ordinary iron, the strength is increased by 12 times, and the hardness is increased by 2-3 times. The tensile or compressive test level is tested. Special steel with high strength and toughness can be made from nano iron materials. Metal ceramic composites can change the mechanical properties of materials in a wider range

(8) when two materials with different properties reach the nano scale, there is synergy under specific conditions. After using super amphiphilic interface materials on the surfaces of glass and ceramic tiles, self-cleaning and anti fog effects can be achieved; In paper products, carton films, etc., after being treated with ultra dual hydrophobic interface physical material technology, they also have super hydrophobic and ultra oil repellent effects; In the field of metal processing, the anti-corrosion effect of various metal surfaces can be improved after being treated with super Bi hydrophobic interface physical material technology

(9) hollow nano materials are inorganic compound nano materials, which are hollow arris shaped. 1% - 4% of the nano materials can be added to the monomer or one of the monomers of the polymer first, and then polymerized (condensed) to make the linear molecules of the polymer pass through the crystal gap of the nano materials, increasing the polar bond force between the nano materials and the polymer. And the configuration of the nano materials is the same as that of corundum. After modifying plastic, rubber, chemical fiber and other polymer materials, The strength above refers to the improvement of conventional products, toughness and wear resistance, which is much higher than that of solid nano materials

(10) in addition, due to the small particle size of nano materials, and the surface smoothness of nano particles becomes worse with the reduction of particle size, forming uneven atomic steps, and the catalytic effect is enhanced. Nano titanium dioxide can convert harmful substances into carbon dioxide, water and organic acids under light conditions, purify the air and improve air quality

2. Packaging machinery

(1) nano magnetic sensitive switches and sensors made of nano microcrystalline magnetic impedance materials will raise the automatic control system to a new level due to their high sensitivity, good linearity and good stability. In addition, the optical properties of nano material coating can also be used in optical applications such as sensors

(2) because nano ceramics have good wear resistance, high strength and strong toughness, they can be used to manufacture cutting tools, sealing rings and bearings of packaging machinery to improve their wear resistance and corrosion resistance. They can also be used to make surface coatings of key components of packaging and transportation machinery and boiling drying bed

(to be continued)

Copyright © 2011 JIN SHI