[Weekly topic] Special lecture on polymer materials "Plastics", learn some knowledge every day (6) Polypropylene PP "Enrich yourself”

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This post was last edited by tclz007 on 2013-12-9 19:01 Starting from this month, the polymer materials sector will start to learn* Activities, I hope sea friends will come to learn * , put forward good suggestions and actively learn * , those who discuss in depth will receive a corresponding amount of wealth and charm rewards~~! In order to allow everyone to come to discuss more actively and learn more actively, * , where the top ten sofas each time will receive "learning * "Positive rewards" Some people may think that they have nothing to do during the day at work, working like a handyman, not knowing what to do, not knowing what to study, day after day, year after year, and unable to see their future. What a terrible thing it is! We must work hard from now on, even if we learn every day * A little bit of knowledge will add up to a lot, and enrich yourself. Now you have to clarify your goals. Only by enriching your brain first can you enrich others. . . . . . Just spend a few minutes a day and you will see the future! ! ! (Anyway, I have learned it. Whether you learn it or not is up to you, except for those who know how to do it, like Haichuan Dana. . . ) Without further ado, let’s start from the basics today~~! Polypropylene 1. Understanding polypropylene Polypropylene (PP for short) is a thermoplastic polypropylene particle shape and packaging form (intermediate product) polymerized from propylene. According to the type and quantity of monomers participating in the polymerization, it can be divided into three categories: homopolymer, random copolymer, and impact (block) copolymer. (Naming rules) Homopolymer grade representation: Letter + two numbers + letters, such as T30S, the first letter T represents the melt index range of the product, the two numbers 30 represent the formula of the additives in the polymer, and the last letter S represents the final use or characteristics of the polymer. use: General material random copolymer grade representation: EP1(or 2)+letter+two numbers+letter. For example, EP1X37F, EP1 or EP2 represents a random copolymer product, the next letter use: Mainly the impact (block) copolymer grade representation of membrane materials and pipe materials: EP+letter+two numbers+letter. For example, EPC30R, EP represents impact (block) copolymer product, the next letter C represents the melt index range of the product, the two numbers 30 represent the formula of the additives in the polymer, and the last letter R represents the ethylene content of the polymer. use: Mainly the basic concepts of injection molding products: Melt index, isotactic molecular weight: An average of 200,000 to 300,000. Relationship between molecular weight and melt index. The basis for brand naming. proportion: 0.9~0.91, which is the lightest among common resins. application: Polypropylene is mainly used to produce woven products, film products, injection molded products, textile products, etc. It is the most widely used plastic raw material in people's lives. Drawn products Injection molded products Fiber products 2. Introduction to polypropylene process technology The polypropylene production process can be roughly divided into four processes: solution method, slurry method, bulk polymerization process, and gas phase polymerization. solvent method: The representative process is Eastman's high-temperature solution process technology polymerization conditions.: 160~170℃, 2.8~7.0MPaG Features: 1. Molecular weight and molecular weight distribution are easy to control. 2. Random matter is as high as 20% to 30%. The product needs to remove catalyst residues and random matter slurry method. 1. Conventional catalyst slurry method. : The representative process is the Italian Montecatini slurry process technology, which was also the technology used in the first industrialization of polypropylene in 1957. Aggregation conditions: Using a solvent as a catalyst, propylene and the catalyst are added to several reactors in series. Polymerization is performed at 50 to 80°C and 1 to 2 MPaG. Features: The product needs to be free of catalyst residues and random matter. 2. High-efficiency catalyst slurry method : The representative process is Mitsui Petrochemical's high-efficiency slurry process technology. Aggregation conditions: Using ultra-high activity and efficient catalyst. Features: The steps of deashing, diluent, and methanol recovery in the conventional catalyst slurry method are omitted, and random substances are eliminated. * * reduce, process * * simplify. Characteristics of bulk polymerization process: Propylene is both a polymerization monomer and a reactant dilution solvent. The polymerization reaction is carried out under the conditions of 50-80°C and 2.5-3.5MPaG. Classification: According to the different polymerization reactors used, there are divided into pot polymerization process and tubular polymerization process. 1. Continuous kettle polymerization process : This process achieved industrial production in 1963. The representative process is Mitsui Petrochemical's Hypol process. Features: This process uses high-efficiency, high stereodirectivity catalyst TK-II, and is a solvent-free and deash-free production process. 2. Continuous tubular polymerization process : Phillips Company's environmental pipe technology, Basell's Spheripol process, Borealis' Borstar process technology (1) Phillips Company's environmental pipe technology: This process is a typical representative of the continuous tubular polymerization process and is also one of the earliest bulk polymerization processes. The Phillips process uses a loop reactor and conventional catalyst production. (2) Basell’s Spheripol process: This process is a combination of loop liquid phase bulk process and gas phase process. It was successfully developed and industrialized by Montedison Company in 1982 and is now owned by Basell Company, a polyolefin company formed by the merger of Shell and BASF. It is the most widely used polypropylene process in the world (3) Borealis’ Borstar process technology : This process is a bimodal polypropylene process developed by Borealis. In May 2000, the world's first bimodal polypropylene production unit was built in Schwechat, Austria, with a production capacity of 200kt/a. Features: The loop reactor operates in a supercritical state, with a typical temperature of 80 to 100°C and a pressure of 5.0 to 6.0MPaG. Propylene undergoes bulk polymerization. ； Propylene and the polymer coming out of the loop reactor continue to react in the fluidized bed gas phase reactor. The operating conditions of the reactor are 80~90℃ and the pressure is 2.5~3.5MPaG. 1. Gas phase polymerization process: This process was first industrialized by BASF in 1969. According to the type of reactor used, it can be divided into gas phase stirring process (vertical stirred bed, horizontal stirred bed) and gas phase fluidized bed process. Gas phase mixing process classification : Novolen gas phase process, Innovene gas phase process, Innovene gas phase process 2. Innovene gas phase process This process is the original Amoco/Innovene gas phase process. It uses a horizontal stirred bed gas phase reactor and controls the reaction temperature by gasification of liquid propylene. 3. Oxygen gas phase process This process uses a horizontal plug flow reactor, a high activity and high selectivity catalyst, and the product form is controllable. Gas phase fluidized bed process Gas phase fluidized bed process classification: UCC's Unipol process technology, Sumitomo's gas phase fluidized bed process technology 1, UCC's Unipol process technology : The process was jointly developed by UCC and Shell in the mid-1980s and is now owned by Univation, a subsidiary of Dow Chemical. There is no prepolymerization step in this process. Instead, a large gas phase fluidized bed reactor is used to produce homopolymers and random copolymers, and another reactor is connected in series to produce impact copolymers. 2. Sumitomo gas phase fluidized bed process technology was successfully developed by Sumitomo Corporation in the 1980s. 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I hope that like me, people who want to gain knowledge every day will listen, and we can learn together every day. * , discuss~~! [Special Lecture] Special Lecture on Polymer Materials "Plastics", which is being updated continuously. http://bbs.hcbbs.com/thread-1256917-1-1.html