Keeb Kwm Ntawm Kev Tsawg Feem Coj Polyethylene Resins
LDPE (Low-density Polyethylene) yog hom uas siv ntau tshaj li ntawm cov tshuaj polyethylene. Cov pob txha muaj ntau ntau tshaj qhov nyuam qhuav tau ua cov hom phiaj polyethylene. Lawv ua pov thawj los ua ib qho tseem ceeb ntawm cov khoom polyethylene uas muaj kev sib to taub zoo tshaj plaws thiab nrog nruj thiab ceev.
Cov resins tseem muaj cov ntawv thov ntim zoo heev rau thaj chaw ntawm kev ua kom loog, lub zog, kev tsim kua muag, luam tawm, thiab elasticity. Cov thermoplastics no yuav ua tau yooj yim ntawm cov kab hauv siab kom siv tau ua cov yeeb yaj kiab, coatings los yog rau lub hom phiaj lamination.
Nws yog ib lub qauv ua los ntawm monomer ethylene. Nws yog thawj qib ntawm polyethylene uas ua los ntawm Imperial Chemical Industries (ICI) hauv xyoo 1933. Lub pob cawv tau tsim los ntawm kev siv lub tshuab muaj zog heev uas muaj npe ua dawb radical polymerization. Txawm hnub no lub thermoplastics yog tsim los ntawm kev siv tib txoj kev. Cov resins no muaj nyob rau hauv ntau cov kev yoog raws ntawm lawv cov txheej txheem rau kev ua haujlwm. Txawm tias muaj kev sib tw ntawm cov polymers nws khaws nws qhov tseem ceeb ua ib qib zoo yas hauv kev ua lag luam.
LDPE Cov Txheej Txheem Ntau Lawm
Ob hom txheej txheem uas siv rau hauv cov khoom uas tsis muaj qhov hnyav rau polyethylene polymer yog (1) Tubular Txheej txheem (2) Autoclave Process. Ob txoj kev no siv dawb radical chemistry.
Low-density polyethylene yog tsim los ntawm tus txheej txheem ntawm lub polymerization ntawm ethylene ntawm kub heev nyob rau hauv lub tubular reactor. Hauv no tubular reactor, siab polymerization pub ntxiv copolymerization ntawm ethylene nrog polar co-monomers.
Txoj kev lag luam muaj qhov kom zoo dua cov txheej txheem autoclave. Cov kab hauv cov qhov cub muaj nqi ntau dua nrog kev siv zog tsawg. Cov kev lag luam hauv ntiaj teb no yog ib qho kev sib koom ua ke hauv kev siv tshuab hluav taws xob tsawg tsawg.
