Ukukhiqizwa kwamanye amazwe ikakhulukazi yi-polyethylene (PE), ukukhiqizwa kwasekhaya ikakhulukazi yi-polypropylene (PP), uhlobo lwe-thermoplastic resin olukhiqizwa yi-ethylene polymerization. Ezimbonini, ihlanganisa nama-copolymers e-ethylene anenani elincane le--olefin. I-Polyethylene ayinaphunga, ayinabo ubuthi, izwakala njenge-wax, inokumelana okuhle kakhulu nokushisa okuphansi (izinga lokushisa eliphansi kakhulu lokusetshenziswa lingafika ku--70 ~ -100℃), ukuzinza okuhle kwamakhemikhali, ingamelana nokuguguleka okukhulu kwe-asidi ne-alkali (akukho ukuwohloka kwe-asidi), izinga lokushisa legumbi elingancibiliki ezinyibilikisini ezijwayelekile, ukumuncwa kwamanzi amancane, ukusebenza kahle kokushisa kukagesi; Kodwa i-polyethylene iyazwela ekucindezelekeni kwemvelo (imiphumela yamakhemikhali neyemishini) futhi inokumelana okuncane nokuguga kokushisa. Izakhiwo ze-polyethylene ziyahlukahluka kusuka ezinhlotsheni kuya ezinhlotsheni, ikakhulukazi kuye ngesakhiwo sama-molecule kanye nobuningi. Imikhiqizo enobukhulu obuhlukile (0.91 ~ 0.96g/cm3) ingatholakala ngokusebenzisa izindlela ezahlukene zokukhiqiza. I-Polyethylene ingacutshungulwa ngendlela ejwayelekile yokubumba i-thermoplastic (bheka ukucutshungulwa kwepulasitiki). Isetshenziswa kabanzi ekwenziweni kwefilimu, isitsha, ipayipi, ucingo olulodwa, ucingo kanye nekhebula, izidingo zansuku zonke, njll., futhi ingasetshenziswa njengezinto zokuvikela ezivame kakhulu ze-TV, i-radar, njll. Ngokuthuthuka kwemboni yamakhemikhali kaphethiloli, ukukhiqizwa kwe-polyethylene kuthuthukiswe ngokushesha, umphumela ocishe ube yi-1/4 yengqikithi yokukhiqizwa kwepulasitiki. Ngo-1983, umthamo wokukhiqiza we-polyethylene wawungu-24.65Mt, kanti umthamo wesitshalo esakhiwa wawungu-3.16Mt.
I-Polypropylene (PP)
I-resin ye-thermoplastic elungiselelwe yi-polymerization ye-propylene. Kunezinhlobo ezintathu zemikhiqizo ye-isochronous, engalawulwa kanye ne-interchronous, kanti imikhiqizo ye-isochronous iyizingxenye eziyinhloko zemikhiqizo yezimboni. I-Polypropylene ihlanganisa nama-copolymer e-propylene kanye nenani elincane le-ethylene. Ngokuvamile i-translucent ayinambala, ayinaphunga futhi ayinabo ubuthi. Ngenxa yokuthi isakhiwo sicocekile futhi sicwebezela kakhulu, ngakho-ke iphuzu lokuncibilika lifinyelela ku-167℃, ukumelana nokushisa, imikhiqizo ingasetshenziswa ukubulala amagciwane ngomusi yizinzuzo zayo ezivelele. Ngobuningi obungu-0.90g/cm3, iyipulasitiki elula kunazo zonke emhlabeni jikelele. Ukumelana nokugqwala, amandla okudonsa angu-30MPa, amandla, ukuqina kanye nokucaca kungcono kune-polyethylene. Inkinga ukumelana nomthelela ophansi wokushisa kanye nokuguga okulula, okunganqotshwa ngokuguqulwa nokwengezwa kwe-antioxidant ngokulandelana.
Umbala wesikhwama esilukiwe ngokuvamile umhlophe noma umpunga omhlophe, awunabo ubuthi futhi awunambitheki, ngokuvamile awulimazi kakhulu umzimba womuntu, yize wenziwe ngezinhlobo ezahlukene zepulasitiki zamakhemikhali, kodwa ukuvikelwa kwawo kwemvelo kunamandla, futhi amandla okusebenzisa kabusha makhulu;
Izikhwama ezilukiwe zisetshenziswa kabanzi, ikakhulukazi ukupakisha nokupakisha izinto ezahlukahlukene, zisetshenziswa kabanzi embonini;
Isikhwama esilukiwe sepulasitiki senziwe nge-polypropylene resin njengento eyinhloko eluhlaza, ekhishwa bese yelulwa ibe yisilika esicaba, bese ilukwa bese kwenziwa izikhwama.
Isikhwama esilukiwe sepulasitiki esihlanganisiwe sisekelwe endwangwini elukiwe yepulasitiki, eyenziwa ngendlela yokugoqa.
Lolu chungechunge lwemikhiqizo lusetshenziselwa ukupakisha impuphu noma izinto eziqinile ezihlanganisiwe kanye nezinto eziguquguqukayo. Isikhwama esilukiwe sepulasitiki esihlanganisiwe sihlukaniswe saba yizikhwama ezimbili eziku-munye kanye nezikhwama ezintathu eziku-munye ngokwendlela eyinhloko yokwakheka kwezinto.
Ngokwendlela yokuthunga, ingahlukaniswa ngesikhwama sokuthunga esingezansi, isikhwama sokuthunga esingezansi, isikhwama sokufaka kanye nesikhwama sokuthunga esibophayo.
Ngokuya ngobubanzi obusebenzayo besikhwama, singahlukaniswa sibe ngu-350, 450, 500, 550, 600, 650 kanye no-700mm. Izinhlangothi zombili kufanele zivumelane ngemininingwane ekhethekile.
Isikhathi sokuthunyelwe: Septhemba-28-2020