Modification and Application of Polypropylene Plastics 1. Polypropylene occupies an important position in the production of synthetic resins and develops rapidly. Polypropylene is an important product among the five general-purpose synthetic resins. It has developed rapidly both at home and abroad. In the world's five synthetic resins for plastics, the production of polypropylene accounts for about 1/4 of the total. It is estimated that in 2006 the total production capacity of the world's five most common synthetic resins will reach 190 million tons, of which 48.78 million tons of polypropylene, accounting for the total 25.6% of capacity [1]. In 2004, China's production of polypropylene resin was 4,748,800 tons, imports were 2.914 million tons, and exports were 15,300 tons, and its apparent consumption was 7.647 million tons, accounting for 25.9% of the total apparent consumption of 25 major resins in the country in the same year. . It is estimated that by 2010, the apparent consumption of polypropylene resin in China will increase to 10.8 million tons, which is an increase of more than 40% from 2004. Table 1 lists the location and capacity of the recently launched and under construction polypropylene units. Table 1 Production capacity of recently constructed and under-constructed polypropylene units [Life and Weft] Construction site (10,000 tons) 1 Polypropylene basic knowledge 1.1 Definition and Classification of Resins and Plastics Resins: Polymers, also known as macromolecules, are classified into natural macromolecules and synthetic macromolecules. Synthetic polymer materials are divided into synthetic resin, synthetic rubber and synthetic fiber according to the three major uses of plastics, rubbers and fibers. The synthetic resins used in plastics account for the largest proportion, accounting for about 2% of the total amount of synthetic materials. /3 or more. Plastics: A material that contains synthetic resin as the main component, a suitable amount of fillers, additives, and pigments, and that can be flow-molded during processing. Thermoplastic: A plastic that repeatedly softens and cools hardened plastics within a specific temperature range. Thermosetting Plastics: Plastics that become infusible and insoluble after the first molding. General Plastics: refers to plastics that have a large volume of production, a wide range of uses, good molding process performance, and relatively inexpensive prices. The plastics based on the five general-purpose resins are polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), and acrylonitrile-butadiene-styrene copolymer (ABS). . Engineering Plastics: Plastics that have high performance and can be used as engineering structural parts. Engineering plastics are divided into general engineering plastics and special engineering plastics. The former are polyamide (PA), polyoxymethylene (POM), polyester (PET and PBT), polycarbonate (PC), modified polyphenylene ether (MPPO). The operating temperature is generally below 150°C, while the special engineering plastics refer to engineering plastics that use temperatures above 150°C, such as PSF, PPS, PI, Polytetrafluoroethylene (PTFE) and so on. 1.2 Types and Characteristics of Polypropylene (PP) 2.2.1 Basic Concept of Polypropylene Polypropylene is a high-molecular polymer obtained by addition polymerization of propylene (CH3-CH=CH2) as a monomer. The reaction characteristic is instantaneously completed, and second, there is no accompanying compound of small molecules. produce. Using Ziegler-Natta catalysts, high molecular weight crystalline PP can be obtained. According to the rules of the arrangement of -CH3 groups in space, PP is classified into three isotactic, syndiotactic and random polymers. Only a highly isotactic PP can produce a good crystalline area to have the excellent properties we need. Isotactic polypropylene has five crystal forms α, β, γ, δ and quasi-hexagonal. The most common is the α-crystalline state, which is monoclinic. The α crystalline state is formed around 138°C, and its melting point is 180°C. The proposed hexagonal state is also called a secondary crystal structure, also called a butterfly-like liquid crystal. When the isotactic PP in the molten state is quenched to 70°C or less, or cold-stretched below 70°C, pseudo-hexagonal crystals are formed. Loose hoodies is our new design,solid color make people clean and youth,the main fabric is 80%cotton 20%poly,fabric is feeling very soft and comfortable ,design is very personality and fashionable ,if u wear it,u will looks young and full of sunshine,we have various kinds of style for ur choice,if u would like to learn more details,please send us ur detail requirements,we will try our best to do well. Loose hoodies Loose Hoodies,Light Board Hoodie,Matching Loose Hoodie,Round Neck Loose Hoodies PinSheng Garments co,ltd , https://www.psfsshirts.com
Daqing Refining 30 has been put into production
Shanghai Secco 25 has been put into production
Beijing Yanshan 12 Expansion and Expansion Successful
Lanzhou Petrochemical 30 has started
Fujian Refining 40 has started
Maoming Petrochemical 30 under construction
Dalian Petrochemical 40 under construction
Ningxia Petrochemical, Shandong Hengyuan Petrochemical 10 under construction
Fujian Quangang 15 under construction
Shaoxing, Zhejiang 10 under construction
Guangzhou Petrochemical 30 put into production before 2009
Formosa Ningbo 45 is put into production before 2007
Zhenhai Refining & Chemical Co., Ltd. put into operation before 2007
Beijing Yanshan Expansion 38 put into operation before 2009
Tianjin Petrochemical 55 put into production before 2008
Inner Mongolia Baotou 30 is under construction
Inner Mongolia Duolun 46 under construction
136 in Dalian, Fushun and other places in Northeast China
Dushanzi Petrochemical 55 Reconstruction and Expansion
Of the announced new capacity, Sinopec has 2.53 million tons of oil per year and PetroChina has 1.35 million tons of oil per year, and most of the projects have production capacities of over 300,000 tons, which have reached a world-class scale. After all of these devices are put into operation, Sinopec's polypropylene production capacity will surpass Basell's, ranking first in the world, and CNPC will also be ranked in the top five. By then, China will become the world's largest producer of polypropylene resin. According to another report, the output of polypropylene resin in China was only 1,073,500 tons in 1995, reaching 5,229,500 tons in 2005, with an average annual increase of 38.7%. The apparent consumption also increased from 2,219,200 tons to 8,233,000 tons in the same period. It has increased by 28.7%, becoming the fastest growing consumer of polypropylene worldwide[2].