Polypropylene (PP) ndi polima yowonjezera ya thermoplastic yopangidwa kuchokera ku kuphatikiza kwa propylene monomers.Ili ndi ntchito zosiyanasiyana, kuphatikiza kuyika zinthu za ogula, zida zapulasitiki zamagalimoto zamagalimoto, ndi nsalu.Asayansi a Philip Oil Company Paul Hogan ndi Robert Banks anayamba kupanga polypropylene mu 1951, ndipo pambuyo pake asayansi aku Italy ndi Germany Natta ndi Rehn anapanganso polypropylene.Natta adakonza ndi kupanga mankhwala oyamba a polypropylene ku Spain mu 1954, ndipo luso lake lonyezimira linadzutsa chidwi chachikulu.Pofika m'chaka cha 1957, kutchuka kwa polypropylene kunali kutakula, ndipo malonda ambiri anali atayamba ku Ulaya konse.Masiku ano, yakhala imodzi mwamapulasitiki omwe amagwiritsidwa ntchito kwambiri padziko lapansi.
Bokosi lamankhwala lopangidwa ndi PP lokhala ndi chivindikiro chomangika
Malinga ndi malipoti, kufunikira kwapadziko lonse lapansi kwa zinthu za PP kuli pafupifupi matani 45 miliyoni pachaka, ndipo akuti kufunikira kudzakwera mpaka matani pafupifupi 62 miliyoni kumapeto kwa 2020. Ntchito yayikulu ya PP ndimakampani opanga ma CD, omwe amawerengera pafupifupi 30% ya zinthu zonse zomwe zimagwiritsidwa ntchito.Chachiwiri ndi kupanga magetsi ndi zida, zomwe zimadya pafupifupi 26%.Zida zapakhomo ndi mafakitale amagalimoto zimadya 10%.Makampani omanga amadya 5%.
PP imakhala yosalala bwino, yomwe imatha kusintha zinthu zina zapulasitiki, monga magiya ndi mipando ya POM.Malo osalala amapangitsanso kuti PP ikhale yovuta kuti igwirizane ndi malo ena, ndiye kuti, PP sichingagwirizane kwambiri ndi guluu wa mafakitale, ndipo nthawi zina iyenera kumangidwa ndi kuwotcherera.Poyerekeza ndi mapulasitiki ena, PP imakhalanso ndi makhalidwe otsika kwambiri, omwe amatha kuchepetsa kulemera kwa ogwiritsa ntchito.PP imatsutsana kwambiri ndi zosungunulira za organic monga mafuta kutentha.Koma PP ndi yosavuta oxidize pa kutentha kwambiri.
Ubwino waukulu wa PP ndi ntchito yake yabwino kwambiri yopangira, yomwe imatha kupangidwa ndi jekeseni kapena kukonza CNC.Mwachitsanzo, mu bokosi la mankhwala la PP, chivindikirocho chimalumikizidwa ndi botolo la botolo ndi hinge yamoyo.Bokosi la mapiritsi litha kukonzedwa mwachindunji ndi jekeseni kapena CNC.Hinge yamoyo yomwe imalumikiza chivindikirocho ndi pepala lapulasitiki lopyapyala kwambiri, lomwe limatha kupindika mobwerezabwereza (kusuntha mozama kwambiri mpaka madigiri 360) osasweka.Ngakhale hinji yamoyo yopangidwa ndi PP siyingathe kunyamula katunduyo, ndiyoyenera kwambiri pabotolo lazofunikira zatsiku ndi tsiku.
Ubwino wina wa PP ndikuti ukhoza kupangidwa mosavuta ndi ma polima ena (monga PE) kupanga mapulasitiki ophatikizika.Copolymer imasintha kwambiri mawonekedwe azinthuzo, ndipo imatha kukwaniritsa ntchito zaukadaulo zamphamvu poyerekeza ndi PP yoyera.
Ntchito ina yosayerekezeka ndikuti PP imatha kukhala ngati pulasitiki komanso fiber.
Zomwe zili pamwambazi zikutanthauza kuti PP itha kugwiritsidwa ntchito pazinthu zambiri: mbale, thireyi, makapu, zikwama zam'manja, zotengera zapulasitiki zowoneka bwino ndi zoseweretsa zambiri.
Makhalidwe ofunika kwambiri a PP ndi awa:
Kukana kwa Chemical: Ma alkali osungunuka ndi ma acid samakhudzidwa ndi PP, zomwe zimapangitsa kuti ikhale chidebe choyenera cha zakumwa zotere (monga zotsukira, zopangira zoyambira, ndi zina).
Kukhazikika komanso kulimba: PP imakhala ndi kukhazikika mkati mwamitundu ingapo, ndipo imapangidwa ndi pulasitiki popanda kusweka koyambirira kwa mapindikidwe, motero nthawi zambiri imawonedwa ngati chinthu "cholimba".Kulimba ndi liwu lauinjiniya lomwe limatanthauzidwa ngati kuthekera kwa chinthu kuti chisanduke (kupindika kwa pulasitiki m'malo mwa zotanuka) osathyoka.
Kukana kutopa: PP imasunga mawonekedwe ake pambuyo popindika kwambiri ndikupindika.Izi ndizofunikira kwambiri popanga ma hinge amoyo.
Insulation: Zinthu za PP zimakhala ndi kukana kwambiri ndipo ndizomwe zimateteza.
Transmittance: Itha kupangidwa kukhala mtundu wowonekera, koma nthawi zambiri imapangidwa kukhala mtundu wowoneka bwino wachilengedwe wokhala ndi mtundu wina.Ngati ma transmittance apamwamba akufunika, acrylic kapena PC ayenera kusankhidwa.
PP ndi thermoplastic yomwe imasungunuka pafupifupi madigiri 130 Celsius, ndipo imakhala yamadzimadzi ikafika posungunuka.Monga ma thermoplastics ena, PP imatha kutenthedwa ndikuzizidwa mobwerezabwereza popanda kuwonongeka kwakukulu.Chifukwa chake, PP imatha kubwezeretsedwanso ndikuchira mosavuta.
Pali mitundu iwiri ikuluikulu: homopolymers ndi copolymers.Ma copolymers amagawidwanso mu block copolymers ndi copolymers mwachisawawa.Gulu lirilonse liri ndi mapulogalamu apadera.PP nthawi zambiri imatchedwa "zitsulo" zamakampani apulasitiki, chifukwa zimatha kupangidwa powonjezera zowonjezera ku PP, kapena kupangidwa mwanjira yapadera, kotero kuti PP ikhoza kusinthidwa ndikusinthidwa kuti ikwaniritse zofunikira zapadera.
PP yogwiritsidwa ntchito m'mafakitale ndi homopolymer.Block copolymer PP imawonjezedwa ndi ethylene kuti ipititse patsogolo kukana.Random copolymer PP imagwiritsidwa ntchito popanga zinthu zowoneka bwino komanso zowoneka bwino
Monga mapulasitiki ena, amayamba kuchokera ku "zigawo" (magulu opepuka) opangidwa ndi distillation yamafuta a hydrocarbon ndikuphatikizana ndi zida zina kuti apange mapulasitiki kudzera mu polymerization kapena condensation reaction.
PP 3D kusindikiza
PP singagwiritsidwe ntchito kusindikiza kwa 3D mu mawonekedwe a filament.
PP CNC processing
PP imagwiritsidwa ntchito pokonza CNC mu mawonekedwe a pepala.Popanga ma prototypes a magawo ochepa a PP, nthawi zambiri timachita makina a CNC pa iwo.PP imakhala ndi kutentha kochepa kwa annealing, kutanthauza kuti imapunduka mosavuta ndi kutentha, choncho imafunika luso lapamwamba kuti lidule molondola.
PP jakisoni
Ngakhale PP ili ndi mawonekedwe a semi-crystalline, ndiyosavuta kuumba chifukwa cha kutsika kwake kusungunuka kwamadzi komanso madzi abwino kwambiri.Mbali imeneyi imathandiza kwambiri liwiro limene zinthuzo zimadzaza nkhungu.Mlingo wa shrinkage wa PP uli pafupi 1-2%, koma udzasiyana chifukwa cha zinthu zambiri, kuphatikizapo kukakamiza, kusunga nthawi, kutentha kwa kutentha, makulidwe a khoma la nkhungu, kutentha kwa nkhungu, ndi mtundu ndi kuchuluka kwa zowonjezera.
Kuphatikiza pakugwiritsa ntchito pulasitiki wamba, PP ndiyoyeneranso kupanga ulusi.Zogulitsa zoterezi zimaphatikizapo zingwe, makapeti, upholstery, zovala, etc.
Ubwino wa PP ndi chiyani?
PP imapezeka mosavuta komanso yotsika mtengo.
PP ili ndi mphamvu zosinthika kwambiri.
PP ili ndi malo osalala.
PP imateteza chinyezi komanso imayamwa madzi pang'ono.
PP imakhala ndi kukana kwamankhwala mumitundu yosiyanasiyana ya ma acid ndi alkalis.
PP ili ndi kukana kutopa kwabwino.
PP ili ndi mphamvu yabwino.
PP ndi insulator yabwino yamagetsi.
●PP ili ndi mphamvu yowonjezera yowonjezera kutentha, yomwe imachepetsa ntchito zake zotentha kwambiri.
● PP imatha kuwonongeka ndi kuwala kwa ultraviolet.
● PP ilibe mphamvu yolimbana ndi zosungunulira za klorini ndi ma hydrocarbon onunkhira.
● PP ndizovuta kupopera pamwamba chifukwa cha kusamata bwino kwake.
● PP ndi yoyaka kwambiri.
● PP ndi yosavuta oxidize.
Nthawi yotumiza: Jul-27-2023