Shanghai Daoqin Plastics Co., Ltd.

R&D 经历

1970 year USA use liquid method made 出, its production combined formed process using/adopting LLDPE methods. α烯烃 commonly used propylene, 1-丁烯, 1-己烯, l-辛烯 and other, its use amount how much effect/influence density large small, generally use amount is 5%（ quality separation ） left right.

separation structure

MDPE separation 子主链 in 平均每1000 carbon in 引入20 甲基支链, or 13 乙基支链, its property can 变化由支链 how much and long short different 而定. copolymer can make its small sheet/slice between 连接链 increase more.

property can features and parameters

MDPE features is resistant ring force cracking property and strong/high degree long maintain property. MDPE versus for density is 0.926-0.953, crystallization degree is 70%-80%, molecular weight is 20万, tensile strength is 8-24兆帕, fracture elongation is 50%-60%, melt temperature degree 126-135℃, melt flow rate is 0.1-35克/10 separation 钟, heat deflection temperature (HDT) （0.46兆帕）49-74℃.

processing methods and application

MDPE can use extrusion, injection, blow molding, rotational molding, 旋转, powder molding processing methods, production process parameters and HDPE and LDPE versus 似, used for pipe/tube, film, in container and other. product used for high speed molding various bottle type, high speed packaging film, various injection molding products, molding product, electrical cable 包覆层, anti water material, water tube/pipe, gas tube/pipe and other.
processing methods separation is high pressure method, low pressure method, in pressure method types. high pressure method use production low density polyethylene (PE), this type of methods development 早, use method production polyethylene (PE) 至今约占 polyethylene (PE) output/production volume 2/3, production technology and catalytic agent development, its growth speed degree already large large rear low pressure method. low pressure method its methods 说, has method, solvent liquid method and gas versus method. method main/primary used for production high density polyethylene (PE), solvent liquid method and gas versus method not only can production high density polyethylene (PE), also can through add copolymer mono 体, production in, low density polyethylene (PE), is type low density polyethylene (PE). in recent years, various low pressure method process development very fast. in pressure method 仅菲利浦 company still in using/adopting, production main/primary is high density polyethylene (PE).