PP polypropylene
Magwiritsidwe osiyanasiyana:
Makampani opanga magalimoto (makamaka kugwiritsa ntchito PP yokhala ndi zowonjezera zitsulo: ma mudguards, ma ducts olowera mpweya, mafani, ndi zina), zida zamagetsi (zotengera zotsuka zitseko, zowumitsira mpweya, mafelemu ochapira ndi zovundikira, zomangira zitseko zamafiriji, ndi zina), Japan Gwiritsani ntchito katundu wogula ( zida udzu ndi munda monga
Otchetcha udzu ndi sprinkler, etc.).
Zikhalidwe za jekeseni nkhungu:
Kuyanika mankhwala: Ngati kusungidwa bwino, palibe mankhwala owumitsa omwe amafunikira.
Kutentha kosungunuka: 220 ~ 275 ℃, samalani kuti musapitirire 275 ℃.
Kutentha kwa nkhungu: 40 ~ 80 ℃, 50 ℃ tikulimbikitsidwa.Mlingo wa crystallization makamaka anatsimikiza ndi nkhungu kutentha.
Kuthamanga kwa jekeseni: mpaka 1800bar.
Kuthamanga kwa jekeseni: Nthawi zambiri, kugwiritsa ntchito jekeseni wothamanga kwambiri kungachepetse kupanikizika kwamkati kuti mukhale osachepera.Ngati pali zolakwika pamwamba pa mankhwalawa, jekeseni yotsika kwambiri pa kutentha kwakukulu iyenera kugwiritsidwa ntchito.
Othamanga ndi zipata: Kwa othamanga ozizira, othamanga omwe ali ndi mainchesi osiyanasiyana ndi 4 ~ 7mm.Ndikoyenera kugwiritsa ntchito doko lozungulira jekeseni ndi wothamanga.Mitundu yonse ya zipata ingagwiritsidwe ntchito.M'mimba mwake momwe zipata zimayambira 1 mpaka 1.5mm, koma zipata zazing'ono ngati 0.7mm zitha kugwiritsidwanso ntchito.Kwa zipata za m'mphepete, kuya kwake kwa chipata kuyenera kukhala theka la makulidwe a khoma;m'lifupi wa chipata chocheperako uyenera kuwirikiza kawiri makulidwe a khoma.Zinthu za PP zitha kugwiritsa ntchito makina othamanga otentha.
Chemical ndi thupi katundu:
PP ndi zinthu theka-crystalline.Ndizovuta kuposa PE ndipo ili ndi malo osungunuka kwambiri.Popeza kuti homopolymer PP ndi yolimba kwambiri pamene kutentha kuli pamwamba kuposa 0 ° C, zipangizo zambiri zamalonda za PP zimakhala ndi ma copolymers omwe ali ndi 1 mpaka 4% ethylene kapena clamp copolymers okhala ndi ethylene yapamwamba.Zinthu za Copolymer PP zimakhala ndi kutentha kwapang'onopang'ono (100 ° C), kuwonekera pang'ono, kuwala kochepa, kukhazikika kochepa, koma kumakhala ndi mphamvu zokulirapo.Mphamvu ya PP imawonjezeka ndi kuchuluka kwa ethylene.Kutentha kwa Vicat kufewetsa kwa PP ndi 150 ° C.Chifukwa cha crystallinity yapamwamba, kusasunthika kwapamwamba ndi kukana kwa zinthu izi ndi zabwino kwambiri.PP ilibe vuto la kuwonongeka kwa chilengedwe.Nthawi zambiri, PP imasinthidwa ndikuwonjezera ulusi wagalasi, zowonjezera zachitsulo kapena mphira wa thermoplastic.Kuthamanga kwa MFR ya PP kumachokera ku 1 mpaka 40. Zida za PP zokhala ndi MFR zochepa zimakhala ndi mphamvu zotsutsa koma zimachepetsera mphamvu zowonjezera.Kwa zipangizo zomwe zili ndi MFR yomweyo, mphamvu ya mtundu wa copolymer ndi yapamwamba kuposa ya mtundu wa homopolymer.Chifukwa cha crystallization, kuchepa kwa PP ndikwambiri, nthawi zambiri 1.8 ~ 2.5%.Ndipo mayendedwe ofanana a shrinkage ndiabwino kwambiri kuposa a PE-HD ndi zida zina.Kuonjezera 30% ya zowonjezera magalasi kungachepetse kuchepa kwa 0.7%.Zida zonse za homopolymer ndi copolymer PP zili ndi mayamwidwe abwino kwambiri a chinyezi, kukana kwa dzimbiri kwa asidi ndi alkali, komanso kukana kusungunuka.Komabe, ilibe kutsutsana ndi ma hydrocarbons onunkhira (monga benzene) zosungunulira, zosungunulira za chlorinated hydrocarbons (carbon tetrachloride), etc. PP ilibe kukana kwa okosijeni pa kutentha kwakukulu monga PE.

Zathuspoons pulasitiki, machubu oyesera apulasitiki, mphuno inhalersndi zinthu zina zomwe zimakhudzana ndi thupi la munthu zimagwiritsa ntchito zipangizo za PP.Tili ndi kalasi yachipatala PP zipangizo ndi chakudya kalasi PP zipangizo.Chifukwa zida za PP sizowopsa.