Kodi polypropylene (PP) ndi chiyani ndipo imagwiritsidwa ntchito bwanji?
Polypropylene (PP) ndi thermoplastic yowonjezera polima yopangidwa ndi kuphatikiza kwa propylene monomers. Ili ndi mapulogalamu osiyanasiyana, kuphatikiza katundu wazogulitsa, zida za pulasitiki zamagalimoto, ndi nsalu. Asayansi a Philip Oil Company Paul Hogan ndi Robert Banks adayamba kupanga polypropylene mu 1951, ndipo pambuyo pake asayansi aku Italiya ndi aku Germany Natta ndi Rehn nawonso adapanga polypropylene. Natta adapanga ndikupanga mankhwala oyamba a polypropylene ku Spain mu 1954, ndipo kuthekera kwake kwa crystallization kunadzutsa chidwi chachikulu. Pofika mu 1957, polypropylene inali itatchuka kwambiri, ndipo malonda ambiri anayamba ku Ulaya konse. Masiku ano, ndi imodzi mwa mapulasitiki omwe amagwiritsidwa ntchito kwambiri padziko lapansi.
Bokosi lazachipatala lopangidwa ndi PP lokhala ndi chivindikiro cholumikizidwa
Malinga ndi malipoti, pakadali pano kufunikira kwa zida za PP kuli pafupifupi matani 45 miliyoni pachaka, ndipo akuti kuyerekezera kumeneku kudzawonjezeka mpaka matani 62 miliyoni pofika kumapeto kwa chaka cha 2020. Ntchito yayikulu ya PP ndi ntchito yolongedza, yomwe amawerengera pafupifupi 30% yazakumwa zonse. Chachiwiri ndikupanga zamagetsi ndi zida, zomwe zimawononga pafupifupi 26%. Zipangizo zamagetsi zapakhomo ndi mafakitale amawononga 10%. Makampani omanga amawononga 5%.
PP imakhala yosalala bwino ndipo imatha kusinthanso zinthu zina zapulasitiki, monga magiya ndi ziyangoyango zamipando zopangidwa ndi POM. Malo osalala amapangitsanso kuti PP ikhale yovuta kutsatira malo ena, ndiye kuti, PP silingagwirizane ndi guluu wa mafakitale, ndipo nthawi zina imayenera kulumikizidwa ndi kuwotcherera. Poyerekeza ndi mapulasitiki ena, PP imakhalanso ndi mawonekedwe a kachulukidwe kotsika, komwe kumatha kuchepetsa kulemera kwa ogwiritsa ntchito. PP imatsutsana kwambiri ndi zosungunulira zamafuta monga mafuta kutentha. Koma PP ndi yosavuta kusungunula kutentha.
Chimodzi mwamaubwino akulu a PP ndichabwino kwambiri pokonza magwiridwe ake, omwe amatha kupangidwa ndi kuumba kwa jekeseni kapena kukonza kwa CNC. Mwachitsanzo, m'bokosi la mankhwala la PP, chivindikirocho chimalumikizidwa ndi thupi la botolo ndi chingwe chamoyo. Bokosi la mapiritsi limatha kukonzedwa mwachindunji ndi jekeseni kapena CNC. Chingwe cholumikizira chivindikirocho ndi pepala loonda kwambiri lomwe limatha kupindika mobwerezabwereza (likuyenda mozungulira kwambiri pafupifupi madigiri 360) osaphwanya. Ngakhale zingwe zamoyo zopangidwa ndi PP sizingathe kunyamula mtengowo, ndizoyenera kwambiri pa kapu ya botolo la zosowa za tsiku ndi tsiku.
Ubwino wina wa PP ndikuti imatha kupopedwa mosavuta ndi ma polima ena (monga PE) kuti apange mapulasitiki ambiri. The copolymer kwambiri amasintha katundu wa zinthu, ndipo akhoza kukwaniritsa ntchito mphamvu zomangamanga poyerekeza ndi PP koyera.
Ntchito ina yopanda malire ndiyakuti PP imatha kugwira ntchito ngati pulasitiki komanso zinthu zopangira ulusi.
Makhalidwe omwe ali pamwambapa amatanthauza kuti PP itha kugwiritsidwa ntchito munjira zambiri: mbale, trays, makapu, zikwama zam'manja, zotengera za pulasitiki zopepuka komanso zoseweretsa zambiri.
Kodi ma PP ndi otani?
Makhalidwe ofunikira kwambiri a PP ndi awa:
Kukana kwamankhwala: madzi osungunuka ndi asidi sizimayenderana ndi PP, zomwe zimapangitsa kukhala chidebe choyenera cha zakumwa (monga zotsekemera, zopangira thandizo, ndi zina zambiri).
Kukhazikika ndi kulimba: PP imatha kutambasuka mkati mwanjira zingapo, ndipo imakumana ndi mapindikidwe apulasitiki osakhazikika poyambira, motero imawoneka ngati "yolimba". Kulimba mtima ndi mawu a uinjiniya omwe amatanthauzidwa ngati kuthekera kwa chinthu kuwonongeka (mapindikidwe apulasitiki m'malo molumikizana ndi zotanuka) osaswa.
Kutopa kukana: PP imasunga mawonekedwe ake pambuyo pakupindika kwambiri ndi kupindika. Izi ndizofunikira kwambiri popanga mahinji okhala.
Kutchinjiriza: PP zakuthupi zimatsutsana kwambiri ndipo ndizoteteza.
Kutumiza: Itha kupangidwa kukhala mtundu wowonekera, koma nthawi zambiri imapangidwa kukhala mtundu wosasinthika wowoneka bwino wokhala ndi utoto winawake. Ngati pakufunika kutumiza kwakukulu, acrylic kapena PC ayenera kusankhidwa.
PP ndi thermoplastic yokhala ndi malo osungunuka pafupifupi 130 madigiri Celsius, ndipo imakhala madzi ikafika potha. Monga ma thermoplastics ena, PP imatha kutenthedwa ndikutenthedwa mobwerezabwereza popanda kuwonongeka kwakukulu. Chifukwa chake, PP imatha kubwezeretsedwanso mosavuta.
Kodi mitundu yosiyanasiyana ya PP ndi iti?
Pali mitundu iwiri ikuluikulu: homopolymers ndi copolymers. Ma Copolymers amagawidwanso m'magawo opangira ma pololymers komanso ma copolymers osasintha. Gulu lirilonse liri ndi ntchito zosiyana. PP nthawi zambiri amatchedwa "chitsulo" chopezeka m'makampani apulasitiki, chifukwa amatha kupanga zowonjezera ma PP, kapena zopangidwa mwanjira yapadera, kuti PP isinthidwe ndikusinthidwa kuti ikwaniritse zofunikira zapadera.
PP yogwiritsa ntchito mafakitale ambiri ndi homopolymer. Kutseka copolymer PP kumawonjezeredwa ndi ethylene kuti kukweze kukaniza. Mapuloteni a copolymer PP amagwiritsidwa ntchito popanga zinthu zowoneka bwino komanso zowonekera.
Kodi PP imapangidwa bwanji?
Monga ma pulasitiki ena, imayamba kuchokera ku "tizigawo tating'onoting'ono" (magulu opepuka) omwe amapangidwa ndi kutaya kwa mafuta a hydrocarbon ndikuphatikizana ndi othandizira ena kupanga mapulasitiki kudzera pakulowetsa kapena kusintha kwa polycondensation.
CNC, 3D yosindikiza ndi jekeseni akamaumba mbali
Kusindikiza kwa PP 3D
PP sichingagwiritsidwe ntchito kusindikiza kwa 3D mu mawonekedwe a filament.
Kukonzekera kwa PP CNC
PP imagwiritsidwa ntchito pokonza CNC mu pepala. Tikamapanga prototypes a ochepa mbali PP, ife kawirikawiri kuchita CNC Machining pa iwo. PP imakhala ndi kutentha kochepa kotsekereza, zomwe zikutanthauza kuti imapunduka mosavuta ndikutentha, chifukwa chake pamafunika luso lapamwamba kudula moyenera.
PP jekeseni
Ngakhale kuti PP ili ndi zinthu zina zotchedwa crystalline, imakhala ndi madzi abwino kwambiri chifukwa cha kukhuthala kotsika kwake, kotero ndikosavuta kupanga. Izi zimathandizira kwambiri kuthamanga komwe nkhaniyo imadzaza nkhungu. Kuchepa kwa PP kuli pafupifupi 1-2%, koma imasiyana chifukwa cha zinthu zambiri, kuphatikiza kukakamiza, kugwira nthawi, kutentha, kusungunuka kwa khoma la nkhungu, kutentha kwa nkhungu, ndi mtundu ndi kuchuluka kwa zowonjezera.
Ntchito zina
Kuphatikiza pa kugwiritsa ntchito pulasitiki wamba, PP ndiyabwino kwambiri kupanga ulusi. Zoterezi zimaphatikizapo zingwe, makalapeti, zovala, zovala, ndi zina zambiri.
Kodi maubwino a PP ndi ati?
PP imapezeka mosavuta komanso yotsika mtengo.
PP ali mkulu flexural mphamvu.
PP imakhala yosalala bwino.
PP ndiyotsimikizira chinyezi ndipo imakhala ndi kuyamwa kotsika kwamadzi.
PP ili ndi mankhwala abwino osakanikirana ndi zidulo zosiyanasiyana.
PP ili ndi kutopa kukana kwabwino.
PP ili ndi mphamvu yabwino.
PP ndi insulator yabwino yamagetsi.
Kodi zovuta za PP ndi ziti?
PP ili ndi koyefishienti yayikulu pakukula kwamatenthedwe, komwe kumachepetsa kutentha kwake.
PP imatha kusokonekera chifukwa cha cheza cha ultraviolet.
PP imakhala yosagwirizana ndi mankhwala osungunuka ndi ma klorini onunkhira.
PP ndiyovuta kupopera kumtunda chifukwa chakusavomerezeka kwake.
PP ndiyotheka kwambiri.
PP ndi yosavuta kusungunuka.
Ngakhale ndizofooka, PP nthawi zambiri imakhala yabwino. Ili ndi mawonekedwe osakanikirana omwe zida zina sizingafanane, ndiye kuti, zimatha kupangidwa ndi ma polima ena kuti apange zida zophatikizira, ndipo zowonjezera zowonjezera zitha kuwonjezeredwa, zomwe zimapangitsa kukhala chisankho chabwino pazinthu zambiri.
Kodi malingaliro a PP ndi ati?
M'mikhalidwe yokhazikika, ndiye kuti, kutentha kozungulira kwa 25 ° C ndi 1 mpweya wopanikizika.
Dzina laumisiri: Polypropylene (PP)
Njira yamagetsi: (C3H6) n
Khodi lazindikiritso (lobwezeretsanso):
Kutentha kosungunuka: 130 ° C
Kutentha kwapadera kwa jekeseni: 32-66 ° C
Kutentha kosokoneza: 100 ° C (pansi pa 0.46 MPa kuthamanga)
Kwamakokedwe mphamvu: 32 MPa
Flexural mphamvu: 41 MPa
Mphamvu yokoka: 0.91
Mlingo wa shrinkage: 1.5-2.0%
