1, metallocene PP
In the 1990s, the advent of metallocene catalysts injected new vitality into the polyolefin industry. Metallocene PP resins have also been commercialized. Tatgor introduced the first metallocene PP in Europe under the trade name MetoceneX50081. It has the rigidity of PP homopolymer and the transparency of PP random copolymer. It is widely used in injection molding, especially for transparent thin wall packaging materials. Production.
Japan Metallocene's metallocene PP homopolymers have good heat resistance, heat distortion temperature of 133 °C, and high bending elastic modulus, hardness and tensile strength, suitable for automotive bumpers and dashboards .
At present, the application of metallocene PP has been extended to injection molded products, films and fiber products. According to reports, global metallocene PP consumption will increase at an annual rate of 65%. Currently there are only three companies that produce metallocene PPs industrially or semi-industrially, and at least 16 companies are developing this technology. According to information, the world's metallocene PP accounted for 10%-20% of total market supply in 2001, and will reach 60%-70% by 2010.
2. PP/POE blend system
Polyolefin thermoplastic elastomers (POEs) are (ethylene/octene) copolymers using a constrained geometry metallocene technology under the trade name Engage. The octene content of the comonomer is 20%-30%. At present, there are 18 types of Kngage products produced by the United States Road-DuPont United Corporation. Its outstanding advantages are: POE-modified PP's impact resistance is superior to that of EPR and EPDM-modified PP. It has both excellent physical properties and is very good. Good processing performance, and improved the optical transparency of PP. Beijing University of Chemical Technology uses this company's POE as an impact modifier of PP to produce a modified PP material with excellent overall performance. The PP/POE bumper special materials developed by Jiangsu Jiangdu Engineering Plastics Factory have been mass-produced and localization of Vantone and CABSTAR bumper materials has been realized.
3, high melt strength PP
The high melt strength PP was proposed and developed by the Belgian company Montell in 1994 under the trade name PaofaxPF814 resin, and its melt strength is 9 times that of conventional homopolypropylene. This high melt strength PP is very attractive in foam extrusion. Borealis has always been committed to the development of this surface technology, and with its technology it is possible to produce extremely low density foam PP.
4, PP alloy / whisker composites
Whisker as a plastic reinforcement material, its development and application began in the 1960s, but due to the complicated production process, the production is very small, and the price is high, which greatly limits its wide application. In the 80's, Japan introduced a cheap potassium titanate whisker, which made it suitable for use in plastics and other applications.
Beijing University of Chemical Technology, etc. developed a PP/EPDM/calcium sulfate whisker composite material with a good interface layer using a surface activation treatment method for calcium sulfate whiskers. The results show that calcium sulfate whiskers can improve the tensile strength and flexural strength of PP/EPDM, and their impact strength is kept in balance. Xi'an Jiaotong University compounded calcium carbonate whiskers treated with coupling agent with PP and found that the tensile strength of the system was improved. When the material was impacted, calcium carbonate whiskers could delay the development of cracks and accelerate the energy dissipation. The effect, therefore, has a -toughening effect, and the use of calcium carbonate whiskers to fill PP, its processing performance has also been significantly improved.
5, nano-materials modified PP
Nanomaterials are a kind of material with new structure developed in the mid-1980s, and are regarded as "the most promising materials in the 21st century". Adding 2%-5% mass fraction of nanoclay can not only improve the gas barrier property and heat resistance of the plastic, but also greatly improve its mechanical properties and thermal properties, and reduce shrinkage and warpage. Compared with traditional PP, nano-PP composites have better rigidity, good low-temperature impact resistance, dimensional stability and lower coefficient of thermal expansion, and excellent surface smoothness. These features make it suitable for the manufacture of automotive body protection panels, bumpers and equipment instrumentation components. Toyota Motor Corporation's Central Research and Development Laboratory, using 5% nano-clay and maleic anhydride modified PP oligomers as compatibilizers to obtain PP nanocomposites, its stiffness is higher than PP filled with the same amount of talc or glass fiber Much more. China has also successfully applied nano-silicon oxides to modify PP, its strength and toughness have been significantly improved, and the processing performance has been improved. In particular, the four major performance indicators of resistivity, water absorption, flexion, and rigidity have reached Exceeds PA6 standard value, can replace PA6.
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