Hottest tracking nanocomposite 0

2022-07-30
  • Detail

Tracking nanocomposites

at present, there are three conferences in the United States with about 200 papers focusing on the impact of nanoparticles on the properties of plastics, such as improving the thermodynamic and barrier properties of plastics, flame retardancy and the impact on conductivity

although the development of nano composites is still in its "infancy", if it is expected, it will become the biggest factor affecting the development of the plastic industry in the next decade, although it is very small. As long as 2% to 5% of the nanoparticles are added to the polymer through melt mixing or in-situ polymerization, the thermodynamic properties, barrier properties and flame retardancy of the polymer can be greatly improved. And it is superior to standard fillers and optical fibers in improving the thermal resistance, dimensional stability and conductivity of materials

although not very eye-catching and not as fast as expected, polymer materials using nanoparticles as additives have penetrated the automotive and packaging markets. At the three technical meetings, about 200 papers were related. Both researchers and businessmen have devoted great enthusiasm to this. Therefore, we can predict that the development of polymer materials using nanoparticles as additives will reach an unprecedented speed. The three conferences mentioned above are the 2004 San Francisco nanocomposites conference, the 2004 Antec conference in Chicago, and the 2004 Brussels nanocomposites conference in Belgium

bbc's Market Research Report shows that in 2003, the sales volume of nano particle composite polymers worldwide was 24.5 million pounds, with a total value of US $90.8 million. In this survey report, it is also predicted that the sales volume of this market will increase at an annual rate of 18.4% and reach US $21.1 million by 2008. At present, the development of nanotechnology has encountered some obstacles, but BCC predicts that its application in some fields will continue to grow at an annual rate of more than 20%

1. The 2005hummer H2 truck chassis of General Motors uses in mold colored TPO nanocomposites for about 7 pounds of components.

whether in laboratory research or in market commercialization, the mainstream of nano filler development is still layered phyllosilicate nano soil, nano mica, carbon nanotubes, and nano graphite plates. In addition, other materials, such as synthetic clay, cage containing siloxane (POSS), and natural fibers such as flax and hemp, are also being studied

the most competitive potential

at present, the two most discussed nano fillers are nano clay and carbon nanotube, and both have achieved commercial applications. Both of them must be chemically modified before use to achieve ultra-fine dispersion and very good adhesion with the resin, so as to achieve the best use effect

facts have also proved that these two nano fillers have achieved very good results in improving the structural properties, thermal properties, barrier properties and flame retardant properties of plastics. Moreover, carbon nanotubes can also improve the electrical conductivity of materials and good dimensional accuracy

at present, because the price of nano clay is low - US $2.25/lb to US $3.25/lb - and can be applied to some of the most common thermoplastics, such as PP, TPO, pet, PE, PS and nylon, its commercialization prospect is the most promising

the most representative nano clay is kaolin, a layered aluminosilicate. The diameter of each layer is about 1 micron, and the aspect ratio reaches 1000:1. At present, the two largest kaolin producers in the United States are nanocor (the main trademark is nanomer) and southern clay products (the main trademark is cloisite), and both companies have formed their own commercial networks. They have their own resin suppliers, surfactant suppliers, blenders, automobile OEM manufacturers and packaging enterprises. Although most of their processes are trade secrets, several commercial achievements are visible

General Motors is the most representative automobile company on the road to application of nanocomposites. GMC Safari and Chevrolet ASTRO, which were launched in 2002, are the first vehicles in the market to use nanocomposites outside the body. They were also used in the models launched in 2003 and 2004. Recently, it has also used a pp/nano clay composite material in the body of the Chevrolet impala, their largest car. The composite material was developed by GM's R & D center in Warren, Michigan, and the cooperation of Basell North America and southern clay products

the latest automobile product of GM that uses nano materials is 2005 GM Hummer H2 SUT. The body of this model uses about 7 pounds of nano composite material components colored in the mold, which are respectively used at the center beam, canopy and protective railings around the cargo hold

adding nano clay to plastics can improve the pressure resistance of plastics, while carbon nanotubes can also improve the conductivity and thermal conductivity of materials. However, the high price of nanotubes (recently quoted at about $100/g) limits their commercial application and development. Since the 1990s, carbon nanotubes have been used in almost every car produced in the United States. The most typical example is to add them to nylon, the material used to manufacture fuel systems, to improve the antistatic properties of the materials. The addition of nanotubes to improve the antistatic properties of the materials has also been used in the preparation of computer read/write protection heads

carbon nanotubes have single-layer and multi-layer structures. The outer diameter of the former is generally 1 to 2nm, while the diameter of the latter is between 8 and 12NM. Its typical length is generally 10 microns, up to 100 microns, and the aspect ratio is at least 1000:1. The tensile strength of carbon nanotubes is 50 times that of ordinary stainless steel tubes (the former is 100 GPa and the latter is 2 GPa), and the thermal conductivity is 5 times that of copper. When it is added into the matrix of polymer materials, the conductivity and thermal conductivity of the materials can be improved better than that of traditional fillers such as carbon black or metal powder

the manufacturers of nanotubes in the United States include Hyperion catalyst (products are multi-layer fiber nanotubes) and zyvex Corp (products are single-layer and multi-layer nanotubes). Both of the masterbatches provided by the two manufacturers contain 15 to 20% of nanotubes

it is reported that pyrograf III nano fiber can be comparable with carbon nanotubes in improving the thermal conductivity, conductivity, thermodynamic properties and flame retardancy of materials. More importantly, nanofibers are cheaper than nanotubes - about $100/pound to $150/pound. These are the conclusions of experimental evaluation after adding nylon, PP, polyurethane and other materials

source of nano clay composites

the alliance between Nano cor and two special product blending enterprises has directly led to the commercial scale application of nano clay composites in construction and protection

forte PP nanocomposite, a new product of noble polymers, has been used on the seat back of Honda acura tl in 2004. The glass filled PP material replaced by Forte PP has complex processing technology and certain visual defects and distortions. Forte has a density as low as 0.928 g/cc, excellent mechanical properties, better surface properties than previous materials, and can be recycled

Forte PP, the product of ble polymer, used the nano meter composite on the rear seat of the 2004 acura tl car, and will also be used on the center console of the 2006 light truck.

noble also pointed out that this new Forte nano material will be used to produce the center console of the new light truck launched in 2006, and will also be used in some office furniture and electrical parts, Replace some (about 20%) of the glass filled PP material to reduce the density and cost of these furniture

polyone has recently introduced PP Homopolymer/deployed the maxxam LST production line of nano clay composite with innovation system, technical equipment system, supply and demand docking system, standard system, statistical system, technology maturity evaluation system and other key work, which has greater viscosity and stronger impact resistance. In an unpublished patent, PolyOne also claims that this new material can improve the previous problems of incomplete peeling and dispersion of clay. Its performance is not inferior to or even better than most thermoplastic engineering plastics. At the same time, it has the advantages of lighter, more beautiful, simpler treatment process and lower cost

polyone also provides new homopolymer PP, modified PP, LLDPE, LDPE, HDPE and a new ethylene copolymer in which the content of nano clay exceeds 40%, some of which are graded according to the level of improving the barrier capacity

polyone reported that it was applied to pallets and liners because maxxam LST composite was designated for engineering resin due to its efficient dimensional control, which is very important for robot assembly. This idea is currently developing towards commercialization. In addition, it has good impact resistance and light weight. Many customers believe that maxxam LST is the best choice for many applications because it can combine the chemical resistance, hardness and recycling cycle of reinforced materials

at the same time, nanocomposites with higher nano particle content can also be used in TPO parts inside or outside the automobile. The key is that they have high dimensional stability, low density and higher extrusion hardness. The evaluation shows that it can also be used in film preparation to improve the barrier capacity, strength and HDT of the film, and can also be used as an additive for biocide or controlled release and transfer of dyes. In blow molding packaging, the nanocomposites can improve the barrier capacity and potential pressure of the thin wall of the packaging layer, shorten the material cycle and reduce the wall thickness. It also has a good application prospect in injection molding containers and. Some industrial departments also hope to use it in improving the flame retardant properties of materials

Tpos with greater strength

in the papers published by general motors and southern clay products, many methods to improve the performance of automotive TPO by adding nano clay were mentioned. These achievements were hard won: it was very difficult to use clay at first because of its easy agglomeration. Later, it was solved by optimizing the feeding mode, screw design, screw speed, temperature and pressure of clay in the extruder. Once this problem is solved, the TPO with nanocomposites shows better performance in many aspects than the traditional TPO with mica as filler, such as maintaining good ductility at low temperature, eliminating "tiger lines", reducing coating delamination, improving the appearance of the confluence line, improving coloring performance and scratch resistance, and recycling. More importantly, the low filling amount from 3% to 21% reduces the material density (from 0.92 to 0.96 to 1.13g/cc), resulting in only a small amount of adhesive when bonding with accessories, further reducing the cost

largest automobile - 2004 Chevrolet impala TPO

nanocomposites used in body parts were jointly developed by GM, Basell NorthAmerica and southern clay products

Copyright © 2011 JIN SHI