Cov khoom siv raw ntawm cov hnab ntim khoom yog polypropylene, thiab cov khoom siv raw rau kev tsim cov polypropylene yog cov roj av, roj av, thiab thee. Coal yog thawj zaug siv los ua roj, thiab roj av yog siv los ua kom zoo naphtha. Tom qab ntawd cov pa roj los ntawm cov pa roj carbon monoxide, thee gases, thiab naphtha tawg yog sib cais. Cov methane sib cais (C1) tuaj yeem siv los ua roj, ethylene (C2) tuaj yeem siv los tsim cov khoom xws li polyethylene, thiab propylene (C3) tuaj yeem siv los tsim cov khoom xws li polypropylene, butylene, thiab lwm yam Alkenes (C2), thiab lwm yam tuaj yeem tsim cov roj hmab, thiab lwm yam, thiab lwm yam roj (Cs ~ Cg) muaj lwm yam siv.
Propylene (tseem hu ua propylene monomer) yog tom qab ntawd polymerized rau hauv polypropylene. Thaum polymerizing polypropylene, Ziegler-Natta catalyst yog siv los tsim crystalline isotactic polypropylene nrog cov qauv tsis tu ncua. Raws li hom polymerization, nws tuaj yeem muab faib ua plaub pawg, uas yog txoj kev daws teeb meem, cov txheej txheem hnyav, cov txheej txheem ntau, thiab cov txheej txheem roj theem. Thawj cov txheej txheem polypropylene tsim muaj cov txheej txheem hauv qab no: polymerization, sib cais thiab monomer rov qab, deashing, tshem tawm cov teeb meem random, ziab, granulation, thiab lwm yam, uas yog hu ua thawj tiam txheej txheem. Cov txheej txheem thib ob tshem tawm cov txheej txheem deliming, thaum cov txheej txheem thib peb ua rau cov txheej txheem tshem tawm cov txheej txheem deliming thiab random teeb meem.
Ib qho ntawm cov khoom siv tseem ceeb rau kev ua cov hnab ntim khoom yog PE. Cov hnab ntim kub-resistant PE ua los ntawm PE yooj yim rau hnub nyoog. Qhov no yog mob taub hau thiab tsis ruaj khov. Lub hnab ntim khoom ua los ntawm PP crystalline cov ntaub ntawv nyuaj dua li cov khoom ua los ntawm PE, thiab lawv yog cov ntsiab lus melting ntawm PP yog qhov siab, vim tias cov khoom sib xyaw PP yog qhov tsis yooj yim ntawm qhov kub siab tshaj 0 degrees Celsius, yog li ntau cov ntaub ntawv PP. muag muaj ob peb puas feem pua ntawm qhov tsis sib xws lossis muaj cov ntsiab lus ethylene ntau dua. Lead aggregate, cov khoom siv polymer PP muaj qhov sib txawv ntawm qhov kub thiab txias, qis dua pob tshab, qis gloss, thiab yoog raws, tab sis nws muaj qhov cuam tshuam zoo rau lub zog thiab tuaj yeem tiv taus qhov cuam tshuam loj. Nws yog vim qhov no kuj siab crystallinity, qhov tawv tawv thiab khawb tsis kam ntawm cov khoom siv kuj zoo. Txawm li cas los xij, tus nqi ntawm cov khoom siv no thaum ua rau hauv cov khoom kub-resistant ton hnab yog qhov siab.