The current status of new PP technology application in the world
Metallocene and single-activity center (SSC) catalyst technology has significantly improved the performance of PP products and further expanded the application of PP. ExxonMobil's Univation (Exxpol/Unipol) technology, Basel's Metocene and Spheripol technologies, JPC/Mitsubishi Chemical's JPC technology, Dow Chemical's Insite/Spheripol technology, Borealis' Borecene technology, Tofina's Atofina technology, Mitsui Chemical's Mitsui technology, and BP's BP technology can use high-performance isotactic PP, impact copolymer PP, random PP, syndiotactic PP or metallocene/SSC catalyst technology. Elastic homopolymer PP. The development of metallocene polypropylene (mPP) has received much attention. At present, the mPP market is about 200,000 tons/year, which is 20% of the mPE market. The annual growth rate of mPP is 25%-35%, and the market in 2006 was 4.24 million tons/year.
Basel and ExxonMobil will share their respective mPP patented technologies to accelerate collaborative development, and Basel will increase its mPP capacity from 30,000 tons/year to 300,000-400,000 tons/year in 2004. And use industrial technology to build industrial scale devices. Japan Polyplastics Co., Ltd. has developed a soft mPP that is comparable to elastomers. Dow Chemical Corporation has industrially produced five new product lines using its metallocene technology since 1993. The recently developed propylene-based polymer has improved processing properties and increased rigidity compared to conventional PP.
For the first time in the world, Atofina Petrochemical Company put the metallocene PP (sPP) into industrial production, while its competitors Exxon Mobil and Basel can only produce isotactic PP. Compared with conventional PP or metallocene isotactic PP, the molecular structure of sPP makes it more transparent, and sPP is much softer than isotactic PP. It can be combined with high ethylene content random PP copolymers and other metallocene plastics. competition. In the early 1990s, Atofina produced sPP in a medium-sized plant in Lapat, Texas, USA. The company has converted the Lapat 13600-18200 ton/year PP production line to sPP, which will produce 2700-3600 in 5 years. The ton/year has increased to 13,600 tons/year. sPP is used to make containers with good control of shrinkage and ease of molding. It can replace PET polyester and PVC for containers that are not easily formed. sPP can also be used in injection and molding applications instead of PE.
Basel has developed a new Ziegler-Natta (ZN) catalyst series that is expected to be commercialized in 2003. This patented succinate ZN catalyst has been validated on Basel polypropylene (PP) units in Italy and the Netherlands. This advanced 5th generation catalyst greatly improves the properties of the homopolymer and multiphase interpolymer PP by improving the molecular weight distribution. This catalyst can be increased by 40%-50% compared to a standard 4th generation ZN catalyst (using a phthalate for internal donors). The 5th generation ZN catalyst was introduced by Basel in 1999 using succinate as an internal donor, improving the ability of the catalyst to control molecular weight distribution, isotacticity and oligomer content.
The Dow Chemical Company also introduced PP new catalyst and process control software for its UnipolPP process. Advanced Ziegler-Natta catalysts are used to produce Imp-pax impact copolymer grade PP that meets engineering specific requirements. After the joint reorganization of the joint carbon and Dow chemical, the first new catalyst for industrialization, Shac330PP catalyst, was established, which was based on the morphological control platform adopted by the Shac310 and 320PP catalysts. This new generation of catalysts improves plant operation and greatly reduces the transfer cost of UnipolPP process technology. The use of this catalyst can increase the capacity of the plant by 15%-25% without increasing investment. In addition, WindowsN-based automated process control software is designed for UnipolPP process technology, which integrates with device automation and corporate information systems.
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