Shanghai Daoqin Plastics Co., Ltd.

摘 need : high density polyethylene (PE) is large polyolefin material 之一, its material 理, mechanical properties excellent 越, by used for plastics gas tube/pipe, construction use tube/pipe and other pipe/tube material. 随 我国 catalytic agent technology development, high density polyethylene (PE) material made process 不断 完善, polyethylene (PE) material market 份额也越 越 large. currently made process is method process, its reaction process easy control, production product property can excellent 良. main/primary high density polyethylene (PE) made process and its application.

key/critical 词: high density polyethylene (PE); process; application

high density polyethylene (PE) is types physical properties good, non property thermoplastic property resin, upper 世纪60 year 代Ziegler use catalytic agent in low pressure lower make polyethylene (PE) polymerization made formed high density polyethylene (PE) （HDPE）, to in is high density polyethylene (PE) already development 近60 more year, in inner outer made methods has types, separation is 淤 浆 method, solvent liquid method and gas versus method production.

high density polyethylene (PE) separation crystallization degree high, less. tool has relatively strong/high hardness and chemical resistant property, therefore by used for pipe/tube, cable cover/cap and other field/area. meanwhile polyethylene (PE) tool has 无毒, water features, by used for food packaging industry in. due to its mechanical properties excellent 良, used for automotive, chemical industry and other field/area. main/primary 阐述 三 large made process research current situation and its high density polyethylene (PE) material in main applications.

1.  high density polyethylene (PE) main applications

high density polyethylene (PE) tool has multiple excellent property can, therefore widely used in food packaging, industrial pipe/tube, automotive cover/cap parts and other field/area.

in pipe/tube application areas, currently most has front field/area is gas tube/pipe field/area, research table/sheet 明, outer high density polyethylene (PE) material pipe/tube market has rate already 经 达 to will 近90%. high density polyethylene (PE) material therefore can to application, and its property can features is can separation, 首先就 is corrosion resistant property, and 传统 铸 iron tube/pipe versus ratio, high density polyethylene (PE) pipe/tube has electrical chemical 腐蚀, resistant oxidation can force ratio iron tube/pipe excellent 越, therefore large large 节约 燃 gas system 维 修 cost. rear is high density polyethylene (PE) material pipe/tube specific gravity ratio iron parts small more, dimensions pipe/tube, plastics tube/pipe quality need small more, more add 便于运 输 and 安装工 as. most rear is high density polyethylene (PE) material in has relatively strong/high hardness meanwhile has relatively good tough property, can formed 折弯, welding and other process, large large 方 便 pipeline 安装, 节省 人 force, force. therefore high density polyethylene (PE) material in pipe/tube to application.

in high density polyethylene (PE) material main applications injection molding, in blow molding and film products. currently polyethylene (PE) material most large field/area is plastics, plastics 消费占据 high density polyethylene (PE) material ratio/proportion will 近30%, main/primary product is various chemical industry, construction material use packaging 桶, parts, packaging cover/cap and other.

in blow molding parts versus for/regarding injection molding parts use amount versus for less 一点, can to 20% left right. in blow molding parts main/primary product is in small type product, by 广泛 应 used for automotive field/area, automotive 油箱, large type base/seat and other product. in Shanghai company is main/primary automotive and 摩托油箱 product.

polymer/macromolecule film products is film products future development direction, world upper 领先 国家 versus launch different high density polyethylene (PE) film products, utilizing high degree polyethylene (PE) material made as film ratio film has more add good mechanical properties, and ratio film thick degree need small, therefore by 广泛 应 used for packaging industry, is from currently 看, film products still 旧依赖 Imported comparison more, in high density film products field/area 缺乏一定 competition force, therefore need large force development film products 业; another high density polyethylene (PE) material in anti film has large application, versus ratio anti film tool has more good anti property can, as is film use in lower easy by bad, use lifespan long, although front investment large, is environmental protection significantly, this is future development direction.

2.  high density polyethylene (PE) made process technology development

most made high density polyethylene (PE) methods is use TiCl4 and AlEt3 catalytic agent catalytic reaction, in low pressure conditions lower make polyethylene (PE) polymerization reaction formed poly 乙 烯. in 1968 year Montedision company R&D 出 以MgCl2 is titanium 系, catalytic agent. large large improves catalytic agent efficiency, improve/increase production efficiency.

1977 year UCC company through catalytic agent, using/adopting silicon acid ester catalytic agent, make catalytic efficiency to 1000kg PE/Cr. main/primary is 以TH series is catalytic agent technology, this type of catalytic agent tool has good flow property and active property, polymerization reaction 发生平稳, suitable for high density polyethylene (PE) product made 备. high density polyethylene (PE) made technology development 离不开 catalytic agent technology development, through year development, currently main/primary made process is types, 即淤浆 method, gas versus method and solvent liquid method.

(1) 淤浆 method made high density polyethylene (PE) method is types will ethylene and 脂肪烃 type solvent agent mixed combined, add titanium or 者铬系 catalytic agent, in low pressure, low temperature lower make ethylene polymerization reaction methods. this type of methods time 早, therefore process versus for comparison formed 熟, to application. according to 反 应 device different reaction can will method separation is 搅拌釜式 and ring tube/pipe reaction device types.

搅拌釜式 most is 由Hoechst company 发明. using/adopting di reaction device, can use, can use. will hydrogen gas and ethylene, catalytic agent and other 放入第一 reaction device, make 之发生 polymerization reaction, polymer 以淤浆 形式存 in 于己烷当 in, therefore is method made process. this type of made process process/workflow simple, for raw materials pure degree requirements high, can active using/adopting or 者并联 methods production mono or is di high density polyethylene (PE). can fast speed formed product grade 切换, therefore to large company 青睐.

另一 types process is ring tube/pipe reaction device process. process type table/sheet is Philips company Philips process, this type of process is using/adopting catalytic agent, catalytic agent in use front need 先进行 active 化处理, rear will raw materials ethylene hydrogen gas and other mixed combined reaction device, in catalytic agent catalytic lower formed polyethylene (PE). this type of process features is cost comparison low, process/workflow comparison less, raw materials easy 于输送, is for raw materials pure degree requirements comparison high.

(2)  gas versus polymerization method gas versus polymerization method is utilizing low pressure gas versus reaction device, using/adopting catalytic agent, make its in 85-110摄氏 degree lower polymerization 反 应. main/primary product density is 0.915-0.970g/cm3. this type of production process main features is as pressure low, cost comparison low and equipment easy repair. is for/regarding raw materials pure degree requirements comparison high, has raw materials need made. most large advantages is rate comparison high, ethylene mono 程转化 rate can to 95%, utilizing rate can to 98.5%. and add reaction ethylene also can recycling to made equipment in use.

and method versus ratio, has method use scope/range 广, currently gas versus method production high density polyethylene (PE) product main/primary is high strength film and cable, is in other 方面就不如淤浆 method application scope 广, method already full formed 商业化 production, is gas versus polymerization method still has large scope/range application to 商业化 field/area in.

(3)  solvent liquid polymerization method solvent liquid polymerization method is will raw materials ethylene solvent solvent agent in in 160-200℃ conditions lower through catalytic agent generate polymerization reaction, generate polyethylene (PE) solvent solvent agent in. its main/primary catalytic agent is ZN series catalytic agent. this type of production process features and method process similar, for raw materials pure degree requirements high, material need 特殊精 made; and due to in reaction device time comparison short, therefore can formed product series 切换.

3. 结 语

high density polyethylene (PE) material property can excellent 良, application 广泛. 我国应当 add large for polyethylene (PE) material 进一步 research. comprehensive 看, polyethylene (PE) material development 离 不开 catalytic agent development, add strong/high research, development more add high catalytic agent is improves efficiency and output/production volume 必经之路. in reaction control 方面, through modified achieve material different property can requirements, reinforcement material comprehensive property can, make application scope more add 广泛, property can more add excellent 越.