iindaba

Yintoni iipolyolefins?

I-Polyolefins lusapho lwe-polyethylene kunye ne-polypropylene thermoplastics.Ziveliswa ikakhulu kwioli kunye negesi yendalo ngenkqubo yepolymerisation ye-ethylene kunye nepropylene ngokulandelanayo.Ukuguquguquka kwazo kubenze baba yenye yeeplastiki ezidumileyo ezisetyenziswayo namhlanje.

Iipropati ze-polyolefins

Kukho iintlobo ezine zeepolyolefins:

• I-LDPE (i-polyethylene ephantsi): I-LDPE ichazwa ngobuninzi be-0.910-0.940 g / cm3.Iyakwazi ukumelana namaqondo obushushu angama-80 °C ngokuqhubekayo kunye nama-95 °C ixesha elifutshane.Yenziwe ngokuguquguqukayo okanye ukwahluka kwe-opaque, ibhetyebhetye kwaye yomelele.
• I-LLDPE (i-linear low-density polyethylene): yi-polyethylene engumgqa ngokubonakalayo, enamanani abalulekileyo amasebe amafutshane, aqhele ukwenziwa yi-copolymerization ye-ethylene ene-olefins emide.I-LLDPE inamandla aphezulu okuqina kunye neempembelelo eziphezulu kunye nokumelana nokugqobhoza kune-LDPE.Ibhetyebhetye kakhulu kwaye yolula phantsi koxinzelelo.Ingasetyenziselwa ukwenza iifilimu ezincinci kwaye inokumelana kakuhle nemichiza.Ineempawu ezilungileyo zombane.Nangona kunjalo, akukho lula ukusetyenzwa njenge-LDPE.
• I-HDPE (i-polyethylene ephezulu yoxinaniso): I-HDPE iyaziwa ngokuba namandla amakhulu ukuya kubuninzi.Ubuninzi be-HDPE bunokuvela kwi-0.93 ukuya kwi-0.97 g / cm3 okanye i-970 kg / m3.Nangona ingxinano ye-HDPE iphezulu nje kancinci kune-polyethylene ephantsi, i-HDPE ine-branching encinci, inika amandla anamandla e-intermolecular kunye namandla okuqina kune-LDPE.Ikwanzima kwaye ayicacanga ngakumbi kwaye inokumelana namaqondo obushushu angaphezulu noko (120 °C ixeshana elifutshane).
• I-PP (ipolypropylene): Ubuninzi be-PP buphakathi kwe-0.895 kunye ne-0.92 g/cm³.Ke ngoko, iPP yiplastiki yemveliso enoxinano oluphantsi.Xa kuthelekiswa ne-polyethylene (PE) inezixhobo eziphezulu zemishini kunye nokumelana nokushisa, kodwa ukuchasana kweekhemikhali kuncinci.I-PP idla ngokuba yomelele kwaye ibhetyebhetye, ngakumbi xa i-copolymerised nge-ethylene.

Ukusetyenziswa kweepololefins

Iimpawu ezithile zeentlobo ezahlukeneyo zeepololefins ziboleka kwizicelo ezahlukeneyo, ezinje:

• I-LDPE: ifilimu yokubambelela, iingxowa zokuthwala, ifilimu yezolimo, iingubo zebhokisi zobisi, iingubo zombane zombane, iingxowa zemizi-mveliso ezinzima.
• I-LLDPE: ifilimu eyoluliweyo, ifilimu yokupakishwa kwamashishini, izikhongozeli ezinodonga olucekethekileyo, kunye nomsebenzi onzima, ophakathi kunye neengxowa ezincinci.
• I-HDPE: iikhreyithi kunye neebhokisi, iibhotile (zemveliso yokutya, izinto zokucoca, izinto zokuthambisa), izikhongozeli zokutya, iithoyi, iitanki zepetroli, ukusonga kwimizi-mveliso kunye nefilimu, imibhobho kunye nezinto zasendlini.
• I-PP: ukupakishwa kokutya, kubandakanywa iyogathi, iimbiza zemajarini, ii-sweet and snack wrappers, izikhongozeli ze-microwave-proof, iifayibha zekhaphethi, ifenitshala yegadi, ukupakishwa kwezonyango kunye nezixhobo zombane, imithwalo, izixhobo zasekhitshini kunye nemibhobho.