Research on the application of nanotechnology in t

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Research on the application of nanotechnology in new packaging materials (1)

Application of strange properties of nano materials in 2016

there is a single set of electro-hydraulic servo control system between sub micron system clusters, so there is a very eye-catching new micro system, namely nano system. The scope of this system is usually set at about nano. Nanoparticle is a typical representative of this system. It belongs to the ultra-fine particle range (nano), and has new characteristics different from conventional solids. The physical and chemical properties of materials depend on their composition and structure, and nanotechnology changes the composition and structure of materials at the atomic and molecular level, so as to optimize the performance of materials. Materials are the basis of all processes and application technologies. Through the implementation of nanotechnology, many new materials with unique properties can be produced

because nano materials have excellent optical, electrical, thermal, magnetic, radiation, absorption and other special functions, they have extremely broad application prospects in the fields of machinery, electronics, chemical industry, packaging, national defense and so on. Nano functional materials have great potential market demand. The special optical and electrical properties, giant magnetoresistance and nonlinear resistance of nano materials have made new breakthroughs in the development of new products of packaging materials

enlightenment of the application of nanotechnology in packaging materials

the research and application of nano packaging in the scale range from above the molecule to below the micron or in the scale range of 1-100 microns has produced a new discipline, which, like other nano disciplines, does not stick to the boundary between scale and scale death, but focuses on the variation behavior and new physical properties of substances caused by small sizes

since Gleiter and others took the lead in preparing nano materials in 1991, nano materials have made great progress after more than 10 years of development. Nowadays, the application of nano materials in the field of packaging, such as nano high barrier sealing packaging materials, nano anti-static packaging materials not only have higher performance than raw materials, but also can be processed under normal conditions. They also have high surface gloss, which provides us with a good application prospect. Nano materials have the advantages of superior performance to general materials due to the combination of nano grains, high concentration grain boundaries and the atomic state of grain boundaries. In recent years, according to the development trend of international nano material research, The preparation of nanostructures (such as nano ordered array system, mesoporous assembly system, mcm-4[etc.) has been established and developed Various methods of assembly system, especially self-assembly and molecular self-assembly, membrane synthesis, carbothermal reduction, droplet epitaxial growth, mesoporous epitaxial growth, etc. A variety of quasi one-dimensional nano materials and nano assembly systems have been successfully prepared. These methods have laid a good foundation for further studying the physical properties of nanostructures and quasi one-dimensional nanostructures, and promoting their application in fine structure devices

the latest technology of nano packaging application research

(I) polymer based nano composite packaging materials make colleges and universities

in terms of packaging field, in recent years, the most studied nano composites abroad are polymer based nano composites (pnmc, which is the abbreviation of polymericnano metered composites). The commonly used polymers are PA, PP, PVC, pet, LCP, etc. Polymer nanocomposites include molecular composite thickener system and inorganic ultra-fine particle composite system. The former disperses rigid polymers such as LCP in the flexible polymer collective at the molecular level (10 nm order of magnitude), and the latter disperses inorganic ultra-fine particles in the flexible polymer matrix in the form of single-layer sheet or layer, and finally makes Nanocomposite packaging materials

the plasticity, wear resistance, hardness and strength of nanocomposite plastic packaging have been significantly improved and enhanced. In 1993, Japan first developed nanocomposite packaging materials "PA6 nanocomposite packaging material" is to use the insertion method to first prepare nano montmorillonite powder, then mix it with caprolactam monomer in a layered manner, and then polymerize them into polyamide nanocomposite matrix, and finally make packaging film or containers of other shapes according to needs. The performance tensile strength and tensile modulus of the prepared nanocomposite PA6 packaging material are increased by 110MPa and 2lcpa respectively, the thermal deformation temperature is 250%, and the thermal deformation temperature is 250% The expansion coefficient is 60% of the original, and the water absorption is greatly reduced. According to foreign research reports, after compounding 4.7% (weight composition) Jiaoling soil material into nylon-6 polymer, the tensile strength of the nanocomposite is increased from 68.6mpa to 97.2mpa, the bending strength is increased from 89.4mpa to 143.0mpa, and the thermal deformation temperature is increased from 65% to 152~c. the increase of thermal deformation temperature means that the application range of this material is greatly expanded. Nanocomposite packaging materials are mainly used for space packaging, food packaging, and the manufacture of advanced mechanical parts. Some can also be used for special packaging, such as anti-static, electromagnetic, anti martyrdom, stealth and dangerous goods packaging

m the gap between the force measuring piston and the force measuring cylinder is large esse~ Smith et al. Research shows that the mechanical properties of silicate epoxy nanocomposites have been similarly improved, and their storage modulus has increased by 60% in the glass area and 450% in the rubber area, which is far from being achieved in the traditional micron or larger particle filler epoxy resin. When the inorganic content is far lower than the filler content in the traditional glass fiber or mineral reinforced polymer, excellent stiffness, strength and thermal stability can be obtained, as well as the processability and dielectric properties of polymer experimental machines in every city in the country, which makes such new materials more widely used in new high-tech fields such as high-efficiency catalysts, biomaterials and environmental protection materials, Japan has applied this unique new material to food packaging, etc

there are many kinds of new polymer nanocomposite packaging materials used for packaging abroad, such as nano montmorillonite powder/PA, nano carbon black/PE, nano SiO2/pip, nano LCP/PI, nano adhesives, etc. The high-grade film compounded with nano SiO2, Ti02 and other particles of about 10nal not only has good permeability, but also greatly improves other physical and chemical properties. It is a new variety needed by the packaging industry. In addition, nano materials can absorb infrared rays, ultraviolet rays, radar waves, etc., and have a good application prospect in military protective packaging-1

it is also reported that the Swedish National Packaging Research Institute is studying polyamide resin Jiaoling soil nanocomposite film for food packaging that requires long shelf life. The polymer matrix they used is a biodegradable semi crystalline thermoplastic polymer. Applying nanotechnology, we can achieve this goal by fusing nano particles (metal, inorganic or organic) into the polymer lattice structure

among polymer based nanocomposite packaging materials, polymer/layered inorganic nanocomposites have developed rapidly due to the breakthrough of intercalation technology. Some research results have begun to enter the industrialization or attracted much attention because of their great industrialization application prospects. Polymer based nanocomposites include two systems: one is molecular composite system; The second is inorganic ultrafine particle composite system. Nano LCP/PI composite packaging materials belong to the former category, while nano carbon black/PE antistatic composite packaging materials belong to the latter. By adding the intercalated organic nano graphite to the polymer, the resistivity of the plastic can be reduced from 1016f~.em to with the addition amount of 2% - 5%. By controlling the addition amount of organic nano graphite, the electrical properties of the polymer can be adjusted within a certain range, and it can be used as an excellent nano plastic packaging material

through intercalation composite technology, organic polymers and inorganic substances can be compounded in nano scale. The obtained materials not only reflect the rigidity, dimensional stability and heat resistance of inorganic materials, but also show the toughness, processability, chemical resistance and good electrical properties of polymers, making it easy to solve the problems of IC integrated circuit electronic product packaging and anti-static

because the added inorganic matter is only 3%-5%, and the phase structure size in the nanometer range is smaller than the wavelength of visible light, the addition of 2% (volume) montmorillonite/PA6 is 3 times larger. Silicate lamellae has a strong barrier effect on gas and water vapor. In addition, it can promote pet crystallization and has a high far red reflection coefficient. It is an ideal packaging material for beer bottles and soft drink bottles

a special inorganic nano oxide can also be prepared and fully dispersed in the high molecular polymer with the help of low melting point low molecular polymer, so that the polymer has the comprehensive environmental protection functions of high barrier, high freshness, antibacterial and mold proof. Project preparation: the final product of Yiyi is a general-purpose special preservation masterbatch, which can be added to various PP, PE, pet, PA film blowing processes, and directly supplied to blow molding manufacturers for high-grade food packaging products

nano polymer conductive packaging materials, (used for anti-static packaging, electromagnetic packaging, etc.) not only greatly improve the conductivity, but also have a variety of changes in appearance color, and other physical and chemical properties; Greatly increased. A super polymer, RSoP is made of ERP/PP/PE talc powder nanocomposites. It has high hardness, good heat resistance and high impact resistance, and can be used as missile packaging materials. For example, adding 10% nano TLCP (thermotropic liquid crystal polymer) to the polymer will increase the tensile strength of the material to 470mp9, which will greatly expand its use

(to be continued)

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