Chidziwitso Chachikulu Chokhudza Mitundu itatu ya PE Material (I)

1. Polyethylene yochuluka kwambiri (HDPE)

HDPE ndi yopanda poizoni, yosakoma komanso yopanda fungo, yokhala ndi kachulukidwe ka 0.940-0.976g/cm3.Ndiwopangidwa ndi polymerization pansi pa zovuta zochepa pansi pa catalysis ya Ziegler chothandizira, motero polyethylene yapamwamba imatchedwanso polyethylene yotsika.

Ubwino:

HDPE ndi mtundu wa utomoni wa thermoplastic wokhala ndi crystallinity wapamwamba komanso wopanda polarity wopangidwa ndi copolymerization ya ethylene.Maonekedwe a HDPE yoyambirira ndi yoyera yamkaka, ndipo imawonekera pang'onopang'ono m'gawo lopyapyala.Ili ndi kukana kwambiri kwa mankhwala ambiri apanyumba ndi mafakitale, ndipo imatha kukana dzimbiri ndi kusungunuka kwa okosijeni amphamvu (concentrated nitric acid), acid-base salt ndi organic solvents (carbon tetrachloride).Polima si hygroscopic ndipo imakhala ndi mpweya wabwino wamadzi ndipo imatha kugwiritsidwa ntchito ngati chinyezi komanso kukana madzi.

Zochepa:

Choyipa chake ndi chakuti kukana kwake kukalamba ndi kuwonongeka kwa chilengedwe sikuli bwino monga LDPE, makamaka oxidation yamafuta idzachepetsa ntchito yake, kotero HDPE imawonjezera ma antioxidants ndi ma UV absorbers pamene amapangidwa kukhala ma coil apulasitiki kuti apititse patsogolo ntchito yake.zophophonya.

2. Polyethylene yotsika kwambiri (LDPE)

LDPE ndi yopanda poizoni, yosakoma komanso yopanda fungo, yokhala ndi kachulukidwe ka 0.910-0.940g/cm3.Ndi polymerized ndi okosijeni kapena organic peroxide monga chothandizira pansi pa kuthamanga kwambiri kwa 100-300MPa.Amatchedwanso high-pressure polyethylene.LDPE nthawi zambiri imatchedwa chitoliro cha PE m'makampani amthirira.

Ubwino:

Polyethylene yotsika kwambiri ndiye mtundu wopepuka kwambiri wa utomoni wa polyethylene.Poyerekeza ndi HDPE, crystallinity (55% -65%) ndi kufewetsa mfundo (90-100 ℃) ndi otsika;imakhala yabwino kusinthasintha, extensibility, transparency, ozizira kukana ndi processability;mankhwala ake Good bata, asidi, alkali ndi mchere amadzimadzi njira;kutchinjiriza bwino magetsi ndi mpweya permeability;mayamwidwe otsika madzi;zosavuta kuyaka.Ndiwofewa m'chilengedwe ndipo ali ndi zowonjezera zabwino, kutsekemera kwa magetsi, kukhazikika kwa mankhwala, ntchito yokonza ndi kukana kutentha kwapansi (kungathe kupirira -70 ° C).

Zochepa:

Choyipa chake ndi chakuti mphamvu zake zamakina, chotchinga chinyezi, chotchinga cha gasi ndi kukana zosungunulira ndizosauka.Mapangidwe a mamolekyu sali okhazikika mokwanira, crystallinity (55% -65%) ndi yochepa, ndipo crystalline melting point (108-126 ° C) imakhalanso yochepa.Mphamvu yake yamakina ndi yotsika kuposa ya polyethylene yapamwamba kwambiri, ndipo coefficient yake impermeability, kukana kutentha ndi kukana kwa dzuwa kukalamba ndi osauka.Antioxidants ndi UV absorbers amawonjezeredwa kuti athetse zofooka zake.