Development of new plastic materials in the hottes

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It is reported that the world consumed about 250billion beer bottles in 2002. The huge market capacity and sales profits have attracted the scientific and industrial circles of various countries to invest in the research of replacing the traditional glass beer bottles with plastic bottles to enter this huge consumer market. The author introduces the three most promising high-performance barrier materials

⊙ Mitsubishi Chemical Company of Japan disperses a small number of carbon nanotube particles with a diameter of 1nm ~ 50nm and a length of several microns into polycarbonate resin to make polycarbonate nanocomposites. Its trade name hypersitew 10 is widely used in lithium batteries, superalloys, cemented carbides, magnetic materials and other fields. 00 it was introduced to the market in 2000

hypersite w1000 has the following physical properties: density 1.3g/cm3, tensile strength 60MPa, elongation at break 80%, bending strength 100MPa, bending modulus 2.5gpa, cantilever notch impact strength 150j/m, thermal deformation temperature 158 ℃ (under 0.45MPa) and 145 ℃ (under 1.81Mpa), volume resistivity 103~1011 Ω· cm, surface resistivity 104~1012 Ω. This kind of nanocomposite has excellent surface finish, physical and mechanical properties, and the so-called particle shedding rarely occurs. It is an ideal high-performance antistatic material, which is applied in the fields of high-performance antistatic materials

⊙ Japan Arakawa Chemical Industry Co., Ltd. prepared epoxy resin by sol-gel method, polyurethane resin and nano silicon dioxide to prepare nano adhesive and coating. It has superior heat resistance, water resistance, bonding performance, etc. it was introduced to the market in 2000 under the name of コンポソセラン

⊙ Ford company has developed two new technologies to produce nanocomposite PP with competitive prices. One is to preheat nano clay by supercritical fluid technology; Another technology is the use of ultrasonic energy. Both of these two technologies can improve the dispersion, insertion and delamination of nano clay lamellae in the processing process, and can remove or reduce expensive compatibilizers

⊙ PA6 nano clay composite has good barrier to oxygen and CO2. At present, it is mainly used in high barrier packaging in the packaging industry, most of which are used as PET bottle core materials. Nano clay can greatly improve the barrier property of PA6, but still maintain the excellent toughness, transparency, hot filling heat resistance, grease resistance and other properties of PA6. The oxygen barrier property of PA6 containing 2% nano clay is 2 times higher than that of the original PA6, while it can be 5 times higher when containing 4%. At present, Honeywell is committed to developing a nylon nanocomposite aegis ox with lower cost than glass. This is an activation passivation barrier material, in which the nano clay is the passivation barrier layer, which plays a synergistic role with the appropriate oxygen getter as the activator. It is said that the material can reduce the oxygen transmittance (OTR) of PA6 by 100 times, and the amount of oxygen infiltration is almost zero. Aegis ox is used as the core layer of the three-layer beer bottle. The barrier system of aegis ox can compete with all existing barrier systems for beer, and can achieve a shelf life of 180 days. The three-layer PET beer bottle made of this material has been applied to anchor beer company in Los Angeles, USA

⊙ American nanocor company developed another high barrier system M9, named imperm, using the composite of amorphous pamxd6 and nano clay from Mitsubishi Gas Chemical Company of Japan as the barrier resin, which is used for the three-layer PET bottle core layer. It is said that the oxygen transmission rate of imperm is 100 times higher than that of pet, and the barrier rates of carbon dioxide and oxygen are 50% and 70% higher than that of standard MXD6 respectively. The transparency and peel resistance are the same as that of standard MXD6, The three-layer structure (PET/M9/PET) beer bottle can meet the beer shelf life requirements of the United States (110 days) and Europe (180 days). The thickness of M9 is thinner than that of MXD6. Therefore, the processing plant can save costs. Mitsubishi Gas Chemical Company has launched M9 pellets that are "available upon purchase" to the market

pa has the disadvantage that the layout of the system is complex. MXD6 is very similar to pet in terms of melting point, glass transition temperature and crystallization process, so it is very suitable for combination with pet. Moreover, there is no adhesive layer between pet and imperm, which can still maintain the sufficient transparency required by the color of glass

pet/pamxd6 multi-layer sheet pressed soybean paste containers have been commercialized. It can be expected that the high temperature and high pressure sterilization resistance and recyclability of pamxd6 series multilayer sheets will be fully utilized. It will be further expanded and applied in rice containers, soft canned food and other fields

the multi-layer bottle made of pamxd6 and pet by CO injection molding and extended blow molding and salivation molding has been used in the United States and European countries to package carbonated drinks and fruit juices, and is very popular in the market. In Japan, this multi-layer bottle is also used to pack salad dressing, various seasonings and natural drinking water. The additive packaging bottle made by mixing pamxd6 and pet has been applied in the markets of advanced countries in the world. Because this kind of packaging bottle can be shaped by using the pet single-layer bottle forming machine to produce the pest phenomenon, and the forming conditions are the same as those of pet single-layer bottles, it can be easily processed into packaging bottles with excellent gas resistance

⊙ German BPE company is using nylon 6/n-mmt composite material (Durethan ku2-2601pa6) prepared from nano clay of nano cor company to make multi-layer packaging casting film for packaging medical products and protective film for corrosive articles. Its OTR is 50% lower than that of original PA, and its rigidity is doubled. Its gloss and transparency are equivalent to that of expensive high transparent copolymer nylon. In addition, it also improves the adhesion resistance of the film

⊙ Ube USA is developing a nanocomposite barrier layer for automotive fuel system. The nanocomposite material can also reduce the transmittance of gasoline, methanol and organic solvents by placing the required cylinder into the tank. When 5%n-mmt was used in PA6 and pa6/pa66 blends, the gasoline transmittance decreased by 4 times compared with that without PA6. The company has developed a process to extrude the barrier fuel oil transmission line under the trade name ecobesta

⊙ Nanomat started the commercial production of nano talc powder (average particle size: 100nm) and nano calcium carbonate (average particle size: 50nm). They can be used in polyolefins, ABS, acetals, PVC, TPEs and thermosetting polyester SMC. It is said that the strength, hardness, heat resistance and cracking resistance of the nano particle filled compound are higher than those of the traditional filler, and the dosage is much lower. Moreover, compared with traditional additives, this nano powder is also a good nucleating agent

⊙ Honeywell has developed nylon 6/n-mmt new grade capron xa-3071. Its toughness is twice that of ordinary nylon 6. Its bending modulus is 4137mpa, and its drop weight impact strength is 1334j/m. It has good heat resistance and chemical resistance, and is easy to process

⊙ Japan Toray Industries Co., Ltd. has developed a method to prepare nylon fibers with a diameter of less than 10 nm. The 1.4 million fibers are bundled together to make a nylon fabric. The surface area of the fabric is more than 1000 times larger than that of the conventional nylon fabric. This new nylon fabric is good at absorbing odor. Its moisture absorption capacity is 2~3 times that of conventional nylon. It is the same as or better than cotton fiber

its uses include clothing materials and materials for various types of filters. This new manufacturing technology is also applicable to polyester and other materials. It is expected that products will be available in 2-3 years

⊙ sbamrock Technologies Inc launched a new nano PTFE with the brand name of nano flon. The average particle size of the new resin ranges from 0.3 to 1.0 μ M, it is said that the lubricity, wear resistance and UV light resistance of the new material have been improved. The surface area of nano flon is 100 times larger than that of traditional PTFE. Products can exist in the form of powder, aqueous dispersion or organic dispersion. They are not only suitable for inks and coatings, but also for gear parts, computer substrates and fibers

⊙ the flame retardancy of nano materials is well known. The smaller the diameter of flame retardant particles, the better the dispersion, the more favorable the control of combustion process, and the better the flame retardant effect. The properties of different plastic materials were improved after adding nano flame retardant materials; ① In PS plastic material, add 6% microcrystalline kaolin nano material, and its heating temperature reaches 415 ℃. If the addition amount increases to 10%, its heating temperature drops to 350 ℃; The smoke emission of PS plastic can be reduced by 4 times; ② When adding 6% silicon nano materials to thermosetting epoxy resin, the calorific value during combustion will decrease by 29% ~ 42%; ③ When nano materials were added to EVA resin, the oxygen index increased from 17 to 19.5, and the smoke emission decreased by 50%; ④ When nylon 6 resin is added with 6% nano materials, its calorific value during combustion is reduced by 3 times. ⑤ when nano materials and flame retardants are added to plastic materials, the effect is better

⊙ successful development of technology for manufacturing hard materials with carbon nanotubes. Scientists from Oklahoma State University in the United States used a layer of carbon nanotubes and a layer of polymer to build a "sandwich type carbon nanotube". The material has super hardness, which is comparable to the superhard ceramic materials used in engineering. This new superhard material is completely organic and very light. It is suitable for manufacturing medical devices implanted into the human body and playing a role for a long time. It also has a good application prospect in the aerospace industry

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