1. High-density polyethylene (HDPE)
HDPE haina chepfu, haina kunaka uye haina hwema, ine density ye0.940-0.976g/cm3.Icho chigadzirwa chepolymerization pasi pekumanikidzwa kwakaderera pasi pecatalysis yeZiegler catalyst, saka yakakwira density polyethylene inonziwo low pressure polyethylene.
Advantage:
HDPE imhando ye thermoplastic resin ine yakakwira crystallinity uye isiri-polarity inoumbwa necopolymerization ye ethylene.Kuonekwa kweiyo HDPE yepakutanga ine mukaka chena, uye inopenya kune imwe nhanho muchikamu chitete.Inopikisa zvakanyanya kumakemikari mazhinji emumba nemaindasitiri, uye inokwanisa kuramba ngura uye kunyungudika kwemaoxidants akasimba (concentrated nitric acid), acid-base salt uye organic solvents (carbon tetrachloride).Iyo polymer haina-hygroscopic uye ine yakanaka mhute yekudzivirira uye inogona kushandiswa kunyorova uye kusanaya kwemvura.
Zvisina kukwana:
Izvo zvakashata ndezvekuti kuramba kwayo kuchembera uye kuputika kwekushushikana kwezvakatipoteredza hakuna kunaka seLDPE, kunyanya kupisa oxidation kunoderedza kushanda kwayo, saka HDPE inowedzera antioxidants uye UV absorbers painogadzirwa mupurasitiki coils kuvandudza kushanda kwayo.zvikanganiso.
2. Yakaderera-density polyethylene (LDPE)
LDPE haina chepfu, haina kunaka uye haina hwema, ine density ye0.910-0.940g/cm3.Iyo ine polymerized neokisijeni kana organic peroxide sechinhu chinokonzeresa pasi pekumanikidzwa kukuru kwe100-300MPa.Inonziwo high-pressure polyethylene.LDPE inowanzonzi PE pombi muindasitiri yekudiridza.
Advantage:
Low-density polyethylene ndiyo yakareruka siyana yepolyethylene resins.Kuenzaniswa neHDPE, crystallinity yayo (55% -65%) uye kunyorovesa poindi (90-100 ℃) yakaderera;ine yakanaka kuchinjika, extensibility, pachena, kutonhora kuramba uye processability;makemikari ayo Good kugadzikana, asidhi, alkali uye munyu aqueous mhinduro;kunaka kwemagetsi ekudzivirira uye kupindira kwemhepo;kunyura kwemvura yakaderera;nyore kupisa.Iyo yakapfava mumasikirwo uye ine yakanaka extensibility, magetsi ekudzivirira, kugadzikana kwemakemikari, mashandiro ekugadzirisa uye kushomeka kwekushisa (kunogona kumira -70 ° C).
Zvisina kukwana:
Izvo zvisingabatsiri ndezvekuti simba rayo remuchina, hunyoro hunovharira, gasi barriers uye solvent resistance hazvina kunaka.Iyo molecular structure haisi nguva dzose yakakwana, crystallinity (55% -65%) yakaderera, uye crystalline melting point (108-126 ° C) zvakare yakaderera.Simba rayo remagetsi rakaderera pane re-high-density polyethylene, uye iyo impermeability coefficient, kupisa kwekushisa uye zuva rekudzivirira kukwegura hazvina kunaka.Antioxidants uye UV absorbers anowedzerwa kugadzirisa kushomeka kwayo.
Nguva yekutumira: Aug-17-2022