I-Polypropylene (PP) yi-crystalline thermoplastic eqinile esetyenziswa kwizinto zemihla ngemihla.Kukho iintlobo ezahlukeneyo zePP ezikhoyo: i-homopolymer, i-copolymer, impembelelo, njl. njl. Iimpawu zayo zomatshini, eziphathekayo, kunye neekhemikhali zisebenza kakuhle kwizicelo ezivela kwiimoto kunye nezonyango ukuya kwipakethe.
Yintoni iPolypropylene?
I-Polypropylene iveliswa kwi-propene (okanye i-propylene) i-monomer.Yintlaka ye-hydrocarbon ehambelanayo.Ifomula yeekhemikhali zepolypropylene yi (C3H6)n.I-PP iphakathi kwezona plastiki zinexabiso eliphantsi ezikhoyo namhlanje, kwaye inoxinano olusezantsi phakathi kweeplastiki zemveliso.Phezu kwepolymerization, i-PP inokwenza amakhonkco amathathu asisiseko ngokuxhomekeke kwindawo yamaqela e-methyl:
I-Atactic (APP).Ulungiselelo olungaqhelekanga lweqela le-methyl (CH3).
I-Isotactic (iPP).Amaqela e-Methyl (CH3) ahlelwe kwelinye icala lekhonkco lekhabhoni
I-Syndiotactic (sPP).Ukulungiswa kweqela le-methyl (CH3).
I-PP yeyosapho lwe-polyolefin yeepholima kwaye yenye yezona zintathu ziphezulu ezisetyenziswa kakhulu iipolima namhlanje.I-Polypropylene inezicelo-zombini njengeplastiki kunye nefayibha-kwishishini leemoto, usetyenziso lwamashishini, iimpahla zabathengi, kunye nentengiso yefenitshala.
Iintlobo ezahlukeneyo zePolypropylene
I-Homopolymers kunye ne-copolymers zezona ntlobo ziphambili zepolypropylene ezikhoyo kwimarike.
Ipropylene homopolymerlelona bakala lisetyenziswa ngokubanzi lenjongo jikelele.Iqulethe kuphela i-propylene monomer kwifom eqinile ye-semi-crystalline.Usetyenziso oluphambili lubandakanya ukupakishwa, amalaphu, ukhathalelo lwempilo, imibhobho, iimoto, kunye nosetyenziso lombane.
Polypropylene copolymeryahlulwe ngokwee-copolymers ezingahleliwe kunye nebhloko ye-copolymers eveliswa nge-polymerizing ye-propene kunye ne-ethane:
1. Ipropylene random copolymer iveliswa ngokudibanisa i-ethene kunye ne-propene.Iquka iiyunithi ze-ethene, ngokuqhelekileyo ukuya kuthi ga kwi-6% ngobunzima, zifakwe ngokungaqhelekanga kwiintambo ze-polypropylene.Ezi polymers ziyaguquguquka kwaye zicace gca, zizenza zilungele usetyenziso olufuna ukungafihli kunye neemveliso ezifuna inkangeleko entle.
2. I-propylene block copolymer iqulethe umxholo ophezulu we-ethene (phakathi kwe-5 kunye ne-15%).Ineeyunithi ze-co-monomer ezilungiselelwe kwipateni eqhelekileyo (okanye iibhloko).Ipateni eqhelekileyo yenza ukuba i-thermoplastic ibe nzima kwaye ingabi nabrittle kune-random co-polymer.Ezi polymers zifanelekile kwizicelo ezifuna amandla aphezulu, njengokusetyenziswa kwamashishini.
Olunye uhlobo lwepolypropylene yimpembelelo ye-copolymer.Ipropylene homopolymer equlethe i-co-mixed propylene random copolymer isigaba esinomxholo we-ethylene we-45-65% ibhekiswa kwi-PP impact copolymer.Ii-copolymers zempembelelo zisetyenziswa ikakhulu ekupakishweni, kwizinto zasendlini, kwifilim, nakwizicelo zemibhobho, kunye nakwicandelo leemoto kunye nombane.
Polypropylene Homopolymer vs. Polypropylene Copolymer
Ipropylene homopolymerinomlinganiselo ophezulu wokuqina wobunzima, kwaye iqinile kwaye yomelele kunecopolymer.Ezi zakhiwo zidibene nokuchasana kweekhemikhali ezilungileyo kunye ne-weldability yenza ukuba ibe yinto ekhethiweyo kwizinto ezininzi ezinokumelana nokubola.
Polypropylene copolymerithambile kodwa inamandla empembelelo angcono.Yomelele kwaye yomelele ngakumbi kunepropylene homopolymer.Ikholisa ukuba noxinzelelo olungcono lokumelana nokuqhekeka kunye nokuqina kobushushu obusezantsi kune-homopolymer ngeendleko zokunciphisa okuncinci kwezinye iipropathi.
Izicelo zePP Homopolymer kunye nePP Copolymer
Izicelo ziphantse zafana ngenxa yeepropati ekwabelwana ngazo ngokubanzi.Ngenxa yoko, ukhetho phakathi kwezi zinto zimbini luhlala lwenziwa ngokusekelwe kwiikhrayitheriya ezingekho zobugcisa.
Ukugcina ulwazi malunga neempawu ze-thermoplastic ngaphambili kuhlala kunenzuzo.Oku kunceda ekukhetheni i-thermoplastic efanelekileyo kwisicelo.Ikwanceda ekuvavanyeni imfuneko yokusetyenziswa kokuphela iya kuzalisekiswa okanye hayi.Nazi ezinye iimpawu eziphambili kunye neenzuzo zepolypropylene:
Indawo yokunyibilika yepolypropylene.Indawo yokunyibilika yepolypropylene yenzeka kuluhlu.
● I-Homopolymer: 160-165 °C
● I-Copolymer: 135-159 °C
Ubuninzi bepolypropylene.I-PP yenye yezona polymers zikhaphukhaphu kuzo zonke iiplastiki zemveliso.Olu phawu luyenza ibe lukhetho olufanelekileyo lokulula / ubunzima--ukugcina izicelo.
● I-Homopolymer: 0.904-0.908 g/cm3
● I-copolymer engaqhelekanga: 0.904-0.908 g/cm3
● I-copolymer yempembelelo: 0.898-0.900 g/cm3
Polypropylene ukuxhathisa imichiza
● Ukuxhathisa okugqwesileyo kwi-acids exutywe kunye ne-concentrated, i-alcohol, kunye neziseko
● Ukumelana kakuhle neealdehydes, iiesters, aliphatic hydrocarbons, neeketones
● Ukuchasana okuncinci kwi-aromatics kunye ne-halogenated hydrocarbons kunye ne-oxidizing agents
Amanye amaxabiso
● I-PP igcina iimpawu zoomatshini nezombane kumaqondo obushushu aphezulu, kwiimeko zokufuma, naxa intywiliselwe emanzini.Yiplastiki egxotha amanzi
● I-PP inokumelana kakuhle noxinzelelo lwendalo kunye nokuqhekeka
● Inovelwano kuhlaselo lweentsholongwane (iintsholongwane, ukungunda, njl.)
● Ibonisa ukuxhathisa okulungileyo ekucoleni inzala ngomphunga
Izongezo zepolymer ezifana nezicacisi, iiretardants zedangatye, iifiber zeglasi, iiminerali, izihluzi eziqhubayo, izinto zokuthambisa, ii-pigments, kunye nezinye izongezo ezininzi zinokuphucula ngakumbi iipropathi zePP zomzimba kunye/okanye zoomatshini.Umzekelo, i-PP inoxhathiso olulambathayo kwi-UV, kungoko ukuzinza kokukhanya ngee-amine ezithintelweyo kuphucula ubomi benkonzo xa kuthelekiswa nepolypropylene engalungiswanga.
Ukungalungi kwePolypropylene
Ukunganyangeki kakuhle kwi-UV, impembelelo, kunye nemikrwelo
I-Ebrittles ngaphantsi -20°C
Ubushushu benkonzo ephezulu esezantsi, 90-120°C
Uhlaselwe yi-acids oxidizing kakhulu, idumba ngokukhawuleza kwi-solvents ene-chlorine kunye ne-aromatics
Ukuzinza kokuguga kobushushu kuchaphazeleka kakubi ngokudibana nezinyithi
Utshintsho lwe-post-molding dimensional ngenxa yeziphumo zecrystallinity
Ukuncamathela kwepeyinti kakubi
Ukusetyenziswa kwePolypropylene
I-Polypropylene isetyenziswa ngokubanzi kwizicelo ezahlukeneyo ngenxa yokumelana kwayo neekhemikhali ezilungileyo kunye nokuwelda.Ukusetyenziswa okuqhelekileyo kwepolypropylene kubandakanya:
Izicelo zokuPakisha
Iipropathi ezilungileyo zesithintelo, ukomelela okuphezulu, ukugqiba umgangatho olungileyo, kunye nexabiso eliphantsi zenza i-polypropylene ilungele usetyenziso oluninzi lokupakisha.
Ukupakishwa okuguquguqukayo.Iifilimu zePP ezicacileyo ezibalaseleyo kunye nokuhanjiswa komphunga ophantsi wokufuma kuyenza ilungele ukusetyenziswa kwipakethe yokutya.Ezinye iimarike zibandakanya i-shrink-film overwrap, iifilimu zeshishini lombane, usetyenziso lwegraphic art, kunye ne-diaper tabs ezilahlwayo kunye nokuvalwa.Ifilimu ye-PP ifumaneka mhlawumbi njengefilimu ephosiweyo okanye i-bi-axially orientated PP (BOPP).
Ukupakishwa okuqinileyo.I-PP ivuthelwe ukuvelisa amakhreyithi, iibhotile, kunye neembiza.Izikhongozeli ezibhityileyo zePP ziqhele ukusetyenziselwa ukupakishwa kokutya.
Impahla zomthengi.I-Polypropylene isetyenziswa kwiimveliso ezininzi zasekhaya kunye nezicelo zeempahla zabathengi, kubandakanya iindawo eziguquguqukayo, izinto zendlu, ifenitshala, izixhobo zombane, imithwalo, kunye nezinto zokudlala.
Izicelo zeemoto.Ngenxa yexabiso eliphantsi, iimpawu ezibalaseleyo zoomatshini, kunye nokubumba, i-polypropylene isetyenziswa ngokubanzi kwiindawo zemoto.Usetyenziso oluphambili lubandakanya iikesi zebhetri kunye neetreyi, iibumpers, iifender liners, i-interior trim, ii-instrumental panels, kunye nezilungisi zeengcango.Ezinye izinto eziphambili zokusetyenziswa kweemoto zePP ziquka i-coefficient ephantsi yokwandiswa kwe-thermal ehambelanayo kunye nobunzima obuthile, ukuchasana kweekhemikhali eziphezulu kunye nemozulu entle, ukuqhutyelwa phambili, kunye nefuthe / ukuqina kokulinganisela.
Iifayibha kunye namalaphu.Umthamo omkhulu wePP usetyenziswa kwicandelo lemarike elaziwa ngokuba ziintsinga kunye namalaphu.Ifiber yePP isetyenziswa kwinkitha yezicelo, kubandakanywa iraffia/slit-film, iteyiphu, intambo, ifilament eninzi eqhubekayo, imicu esisiseko, ibhondi ephothiweyo, kunye nefilament eqhubekayo.Intambo yePP kunye ne-twine yomelele kakhulu kwaye ayinyangeki ukufuma, ifanelekile kakhulu kwizicelo zaselwandle.
Izicelo zonyango.I-Polypropylene isetyenziswe kwizicelo ezahlukeneyo zonyango ngenxa yokuchasana kweekhemikhali kunye neebhaktheriya.Kwakhona, ibakala lezonyango le-PP libonisa ukuxhathisa okulungileyo ekubulaleni inzala ngomphunga.
Iisirinji ezilahlwayo sesona sicelo sixhaphakileyo sonyango sepolypropylene.Ezinye izicelo zibandakanya iibhotile zonyango, izixhobo zokuxilonga, izitya zepetri, iibhotile ezifakwa emithanjeni, iibhotile zesampuli, iitreyi zokutya, iipani kunye nezikhongozeli zeepilisi.
Izicelo zamashishini.Amaphepha e-polypropylene asetyenziswa ngokubanzi kwicandelo loshishino ukuvelisa iitanki ze-asidi kunye neekhemikhali, amaphepha, imibhobho, i-Returnable Transport Packaging (RTP), kunye nezinye iimveliso ngenxa yeempawu zayo ezifana namandla aphezulu, ukumelana nokushisa okuphezulu, kunye nokuxhathisa ukubola.
I-PP yi-100% inokuphinda isetyenziswe.Iimeko zebhetri yemoto, izibane zesignali, iintambo zebhetri, iibrooms, iibrashi, kunye ne-ice scrapers yimizekelo embalwa yeemveliso ezinokuthi zenziwe kwi-polypropylene ehlaziyiweyo (rPP).
Inkqubo yokurisayikilisha yePP ikakhulu ibandakanya ukunyibilika kwenkunkuma yeplastiki ukuya kuma-250°C ukususa ungcoliseko olulandelwa kukususwa kweeathom ezishiyekileyo phantsi kwevacuum kunye nokuqina phantse kwi-140°C.Le PP ehlaziyiweyo inokudityaniswa ne-PP eyintombi ngesantya ukuya kuma-50%.Umceli mngeni ophambili kwi-PP yokuphinda isetyenziswe inxulumene nemali esetyenzisiweyo-okwangoku phantse i-1% yeebhotile ze-PP zihlaziywa, xa kuthelekiswa ne-98% yokuhlaziywa kweebhotile ze-PET & HDPE kunye.
Ukusetyenziswa kwe-PP kuthathwa njengekhuselekile kuba ayinayo nayiphi na impembelelo ephawulekayo kwimbono yezempilo kunye nokhuseleko lomsebenzi, ngokwemichiza yetyhefu.Ukufunda ngakumbi malunga nePP jonga isikhokelo sethu, esibandakanya ukusetyenzwa kolwazi kunye nokunye.
Ixesha lokuposa: Jul-03-2023