Polypropylene (PP) ndi crystalline thermoplastic yolimba yomwe imagwiritsidwa ntchito pazinthu zatsiku ndi tsiku.Pali mitundu yosiyanasiyana ya PP yomwe ilipo: homopolymer, copolymer, impact, ndi zina zotero. Kapangidwe kake, thupi, ndi mankhwala amagwira ntchito bwino muzogwiritsira ntchito kuyambira magalimoto ndi zachipatala mpaka kulongedza.
Polypropylene ndi chiyani?
Polypropylene imapangidwa kuchokera ku propene (kapena propylene) monomer.Ndi mzere wa hydrocarbon resin.Mankhwala a polypropylene ndi (C3H6)n.PP ili m'gulu la mapulasitiki otsika mtengo omwe alipo masiku ano, ndipo Ili ndi kachulukidwe kakang'ono kwambiri pakati pa mapulasitiki azinthu.Pa polymerization, PP imatha kupanga maunyolo atatu oyambira kutengera momwe magulu a methyl ali:
Atactic (APP).Makonzedwe osagwirizana ndi gulu la methyl (CH3).
Isotactic (iPP).Magulu a Methyl (CH3) adakonzedwa mbali imodzi ya kaboni
Syndiotactic (sPP).Kukonzekera kwa gulu la methyl (CH3).
PP ndi ya banja la polyolefin la ma polima ndipo ndi imodzi mwama polima atatu apamwamba omwe amagwiritsidwa ntchito kwambiri masiku ano.Polypropylene imagwira ntchito - ngati pulasitiki komanso ngati fiber - m'makampani amagalimoto, ntchito zamafakitale, katundu wogula, komanso msika wamipando.
Mitundu Yosiyanasiyana ya Polypropylene
Ma homopolymers ndi copolymers ndi mitundu iwiri ikuluikulu ya polypropylene yomwe ikupezeka pamsika.
Propylene homopolymerndiye giredi yomwe imagwiritsidwa ntchito kwambiri pazolinga zonse.Lili ndi propylene monomer yokha mu mawonekedwe a semi-crystalline olimba.Ntchito zazikuluzikulu zikuphatikiza kulongedza, nsalu, chisamaliro chaumoyo, mapaipi, magalimoto, ndi magetsi.
Polypropylene copolymeramagawidwa mwachisawawa ma copolymers ndi block copolymers opangidwa ndi polymerizing wa propene ndi ethane:
1. Propylene mwachisawawa copolymer amapangidwa polima pamodzi ethene ndi propene.Amakhala ndi mayunitsi a ethene, nthawi zambiri mpaka 6% ndi misa, ophatikizidwa mwachisawawa mu unyolo wa polypropylene.Ma polima awa ndi osinthika komanso omveka bwino, kuwapangitsa kukhala oyenera kugwiritsa ntchito zomwe zimafunikira kuwonekera komanso pazinthu zomwe zimafunikira mawonekedwe abwino.
2. Propylene block copolymer ili ndi ethene yapamwamba (pakati pa 5 ndi 15%).Ili ndi mayunitsi a co-monomer okonzedwa mwanjira yokhazikika (kapena midadada).Mawonekedwe anthawi zonse amapangitsa thermoplastic kukhala yolimba komanso yocheperako poyerekeza ndi polima yachisawawa.Ma polima awa ndi oyenera kugwiritsa ntchito zomwe zimafuna mphamvu zambiri, monga kugwiritsa ntchito mafakitale.
Mtundu wina wa polypropylene ndi impact copolymer.Propylene homopolymer yokhala ndi co-mixed propylene random copolymer phase yomwe imakhala ndi ethylene yokwana 45-65% imatchedwa PP impact copolymer.Impact copolymers amagwiritsidwa ntchito kwambiri pakuyika, zida zapanyumba, filimu, ndi mapaipi, komanso m'magawo agalimoto ndi magetsi.
Polypropylene Homopolymer vs. Polypropylene Copolymer
Propylene homopolymerili ndi chiŵerengero champhamvu cha mphamvu ndi kulemera, ndipo ndi yolimba komanso yamphamvu kuposa copolymer.Zinthu izi kuphatikizika ndi kukana kwabwino kwa mankhwala ndi kuwotcherera kumapangitsa kukhala chinthu chosankha m'magulu ambiri osagwirizana ndi dzimbiri.
Polypropylene copolymerndi chofewa pang'ono koma chimakhala ndi mphamvu zowongolera.Ndizovuta komanso zolimba kuposa propylene homopolymer.Amakonda kukhala ndi mphamvu yolimbana ndi kupsinjika kwamphamvu komanso kulimba kwa kutentha kuposa homopolymer ndikuchepetsa pang'ono zinthu zina.
PP Homopolymer ndi PP Copolymer Mapulogalamu
Mapulogalamuwa ali pafupifupi ofanana chifukwa cha zomwe amagawana kwambiri.Chotsatira chake, kusankha pakati pa zipangizo ziwirizi nthawi zambiri kumapangidwa pogwiritsa ntchito njira zomwe sizili zamakono.
Kusunga zambiri za katundu wa thermoplastic pasadakhale kumakhala kopindulitsa nthawi zonse.Izi zimathandiza posankha thermoplastic yoyenera pakugwiritsa ntchito.Zimathandizanso kuwunika momwe ntchito yomaliza iyenera kugwiritsidwira ntchito ikakwaniritsidwa kapena ayi.Nazi zina zazikulu ndi zabwino za polypropylene:
Malo osungunuka a polypropylene.Kusungunuka kwa polypropylene kumachitika mosiyanasiyana.
● Homopolymer: 160-165°C
● Copolymer: 135-159°C
Kuchuluka kwa polypropylene.PP ndi imodzi mwama polima opepuka kwambiri pakati pa mapulasitiki onse ogulitsa.Izi zimapangitsa kukhala njira yabwino yopangira zopepuka / zolemetsa - zopulumutsa.
● Homopolymer: 0.904-0.908 g/cm3
● Copolymer mwachisawawa: 0.904-0.908 g/cm3
● Impact copolymer: 0.898-0.900 g/cm3
Polypropylene Chemical resistance
● Kutha kukana kwambiri ma asidi osungunuka, mowa, ndi maziko
● Amatha kupirira ma aldehydes, esters, aliphatic hydrocarbons, ndi ma ketoni
● Kulephera kukana ma hydrocarbon onunkhira ndi halogenated ndi ma oxidizing agents
Mfundo zina
● PP imasunga zinthu zamakina ndi zamagetsi pakatentha kwambiri, m'malo achinyezi, komanso ikamizidwa m'madzi.Ndi pulasitiki yopanda madzi
● PP ili ndi kukana bwino kupsinjika kwa chilengedwe ndi kusweka
● Imakhudzidwa ndi tizilombo toyambitsa matenda (mabakiteriya, nkhungu, ndi zina zotero)
● Imawonetsetsa kukana kutsekereza kwa nthunzi
Zowonjezera ma polima monga zowunikira, zoletsa moto, ulusi wamagalasi, mchere, zodzaza mafuta, mafuta, ma pigment, ndi zina zambiri zitha kupititsa patsogolo mawonekedwe a PP komanso / kapena makina.Mwachitsanzo, PP ilibe mphamvu yolimbana ndi UV, motero kukhazikika kwa kuwala ndi ma amine oletsedwa kumawonjezera moyo wautumiki poyerekeza ndi polypropylene yosasinthika.
Zoyipa za Polypropylene
Kukana koyipa kwa UV, kukhudza, ndi zokwawa
Amamera pansi pa -20°C
Kutentha kwapamwamba kwapamwamba, 90-120 ° C
Kugonjetsedwa ndi kwambiri oxidizing zidulo, amatupa mofulumira zosungunulira chlorinated ndi aromatics
Kukhazikika kwa kutentha kwa kutentha kumakhudzidwa kwambiri ndi kukhudzana ndi zitsulo
Kusintha kwa mawonekedwe pambuyo poumba chifukwa cha crystallinity zotsatira
Kusakhazikika kwa utoto
Kugwiritsa ntchito polypropylene
Polypropylene imagwiritsidwa ntchito kwambiri pazinthu zosiyanasiyana chifukwa cha kukana kwake kwamankhwala komanso kuwotcherera.Zomwe zimagwiritsidwa ntchito kwambiri ndi polypropylene ndi izi:
Packaging Applications
Zotchinga zabwino, mphamvu zambiri, kumaliza kwabwino, komanso kutsika mtengo kumapangitsa polypropylene kukhala yabwino pamapaketi angapo.
flexible phukusi.Makanema a PP 'mawonekedwe abwino kwambiri owoneka bwino komanso kutsika kwa mpweya wa nthunzi kumapangitsa kuti ikhale yoyenera kugwiritsidwa ntchito popanga chakudya.Misika ina imaphatikizira kuchulukira kwamafilimu ocheperako, makanema apakampani yamagetsi, kugwiritsa ntchito zojambulajambula, ndi ma tabu otayidwa ndi kutseka.Kanema wa PP amapezeka ngati filimu yoponyedwa kapena PP yotsatiridwa ndi bi-axially (BOPP).
Kupaka kokhazikika.PP imawumbidwa kuti ipange mabotolo, mabotolo, ndi miphika.Zotengera zokhala ndi mipanda yopyapyala za PP zimagwiritsidwa ntchito kwambiri pakuyika chakudya.
Katundu wa ogula.Polypropylene imagwiritsidwa ntchito pazinthu zingapo zapakhomo ndi zinthu zogula, kuphatikiza zida zowoneka bwino, zapanyumba, mipando, zida, katundu, ndi zoseweretsa.
Ntchito zamagalimoto.Chifukwa cha mtengo wake wotsika, mawonekedwe apamwamba amakina, komanso kuumbika, polypropylene imagwiritsidwa ntchito kwambiri pamagalimoto.Ntchito zazikuluzikulu zimaphatikizapo mabatire ndi thireyi, ma bumpers, ma fender liners, zomangira zamkati, mapanelo a zida, ndi zotchingira zitseko.Zina zofunika kwambiri pamagalimoto a PP ndikuphatikiza kutsika kwamphamvu kwamphamvu kwamphamvu komanso mphamvu yokoka, kukana kwamphamvu kwamankhwala komanso kusinthasintha kwanyengo, kutheka, komanso kukhazikika / kuuma.
Ulusi ndi nsalu.Kuchuluka kwa PP kumagwiritsidwa ntchito pamsika wotchedwa ulusi ndi nsalu.CHIKWANGWANI cha PP chimagwiritsidwa ntchito pazinthu zambiri, kuphatikiza raffia/slit-filimu, tepi, zomangira, ulusi wambiri wopitilira, ulusi wambiri, ulusi wopota, ndi ulusi wopitilira.Chingwe cha PP ndi twine ndi zamphamvu kwambiri komanso zosagwirizana ndi chinyezi, zoyenera kugwiritsa ntchito panyanja.
Mapulogalamu azachipatala.Polypropylene imagwiritsidwa ntchito pazachipatala zosiyanasiyana chifukwa cha kukana kwamankhwala ndi mabakiteriya.Komanso, kalasi yachipatala ya PP imawonetsa kukana bwino kutsekereza kwa nthunzi.
Ma syringe otayidwa ndiye njira yodziwika bwino yachipatala ya polypropylene.Ntchito zina ndi monga mbale zachipatala, zipangizo zodziwira matenda, mbale za petri, mabotolo olowetsa m'mitsempha, mabotolo a zitsanzo, ma tray a chakudya, mapoto, ndi zotengera zamapiritsi.
Mapulogalamu a mafakitale.Mapepala a polypropylene amagwiritsidwa ntchito kwambiri m'mafakitale kuti apange akasinja a asidi ndi mankhwala, mapepala, mapaipi, Returnable Transport Packaging (RTP), ndi zinthu zina chifukwa cha katundu wake monga kulimba kwamphamvu kwambiri, kukana kutentha kwakukulu, ndi kukana kwa dzimbiri.
PP ndi 100% yobwezeretsanso.Ma batire a galimoto, magetsi owonetsera, zingwe za batri, ma brooms, maburashi, ndi ice scrapers ndi zitsanzo zochepa za zinthu zomwe zingapangidwe kuchokera ku polypropylene (rPP).
Njira yobwezeretsanso PP imaphatikizapo kusungunula zinyalala za pulasitiki mpaka 250 ° C kuti zichotse zonyansa zomwe zimatsatiridwa ndi kuchotsedwa kwa mamolekyu otsalira pansi pa vacuum ndi kulimba pafupifupi 140 ° C.Izi zobwezerezedwanso PP akhoza blended ndi namwali PP pa mlingo mpaka 50%.Chovuta chachikulu pakubwezeretsanso kwa PP chikugwirizana ndi kuchuluka kwake komwe kumadyedwa - pafupifupi mabotolo 1% a PP amasinthidwanso, poyerekeza ndi 98% yobwezeretsanso mabotolo a PET & HDPE palimodzi.
Kugwiritsiridwa ntchito kwa PP kumaonedwa kuti ndi kotetezeka chifukwa sikukhala ndi zotsatira zochititsa chidwi kuchokera pamalingaliro aumoyo ndi chitetezo kuntchito, ponena za poizoni wamankhwala.Kuti mudziwe zambiri za PP onani kalozera wathu, womwe umaphatikizapo zambiri zosinthira ndi zina zambiri.
Nthawi yotumiza: Jul-03-2023