Qhov txawv ntawm Polypropylene Hom
Jan 16, 2024| Polypropylene yog dab tsi?
Polypropylene yog tsim los ntawm propene (los yog propylene) monomer. Nws yog linear hydrocarbon resin. Cov tshuaj formula ntawm polypropylene yog (C3H6)n. PP yog cov khoom pheej yig tshaj plaws uas muaj niaj hnub no, thiab nws muaj qhov ntom ntom ntawm cov khoom siv yas. Raws li polymerization, PP tuaj yeem tsim peb lub hauv paus saw hlau nyob ntawm txoj haujlwm ntawm pawg methyl:
Atactic (AAPP).Irregular methyl pawg (CH3) kev npaj
Isotactic (iPP).Methyl pawg (CH3) teem rau ntawm ib sab ntawm cov saw hlau
Syndiotactic (sPP).Alternating methyl pawg (CH3) kev npaj
PP belongs rau polyolefin tsev neeg ntawm polymers thiab yog ib qho ntawm peb sab saum toj-siv polymers niaj hnub no. Polypropylene muaj cov ntawv thov-ob qho tib si li yas thiab fiber ntau-hauv kev lag luam tsheb, kev lag luam kev lag luam, cov khoom siv, thiab cov rooj tog ua lag luam.
Ntau hom Polypropylene
Homopolymers thiab copolymer yog ob hom tseem ceeb ntawm polypropylene muaj nyob hauv khw.
Propylene homopolymeryog qib siv dav dav tshaj plaws. Nws tsuas muaj propylene monomer nyob rau hauv ib daim ntawv semi-crystalline khoom. Cov ntawv thov tseem ceeb suav nrog kev ntim khoom, textiles, kev kho mob, kav dej, tsheb, thiab kev siv hluav taws xob.
Polypropylene copolymermuab faib ua random copolymer thiab thaiv copolymer uas ua los ntawm polymerizing propane thiab ethane:
Propylene random copolymer yog tsim los ntawm polymerizing ua ke ethene thiab propene. Nws nta ethene units, feem ntau txog li 6% los ntawm huab hwm coj, sib koom ua ke hauv cov saw hlau polypropylene. Cov polymers no hloov tau yooj yim thiab optically ntshiab, ua rau lawv haum rau daim ntaub ntawv xav tau pob tshab thiab rau cov khoom xav tau ib tug zoo heev tsos.
Propylene block copolymer muaj cov ntsiab lus ethene ntau dua (nruab nrab ntawm 5 thiab 15%). Nws muaj co-monomer units teem nyob rau hauv ib tug tsis tu ncua qauv (los yog blocks). Cov qauv tsis tu ncua ua rau cov thermoplastic tougher thiab tsawg nkig dua li cov random co-polymer. Cov polymers no haum rau cov ntawv thov uas xav tau lub zog siab, xws li kev siv hauv kev lag luam.
Lwm hom polypropylene yog cuam tshuam copolymer. Ib qho propylene homopolymer uas muaj cov sib xyaw propylene random copolymer theem uas muaj cov ntsiab lus ethylene ntawm 45-65% yog xa mus rau PP cuam tshuam copolymer. Impact copolymer feem ntau yog siv rau hauv ntim, khoom siv hauv tsev, zaj duab xis, thiab cov yeeb nkab siv, nrog rau hauv cov tsheb thiab hluav taws xob.
Polypropylene cov chaw muag khoom suav nrog A. Schulman, Borealis, ExxonMobil Chemical, LyondellBasell, SABIC, thiab RTP Lub Tuam Txhab.
Polypropylene Homopolymer vs Polypropylene Copolymer
Propylene homopolymermuaj lub zog-rau-hnyav piv thiab muaj zog thiab muaj zog dua li cov copolymer. Cov khoom no ua ke nrog cov tshuaj tiv thaiv zoo thiab weldability ua rau nws cov khoom xaiv hauv ntau cov qauv corrosion-resistant.
Polypropylene copolymeryog me ntsis softer tab sis muaj kev cuam tshuam zoo zog. Nws yog tawv thiab ruaj khov dua li propylene homopolymer. Nws nyhav kom muaj kev ntxhov siab zoo dua qub thiab qis dua qhov kub thiab txias dua li homopolymer ntawm tus nqi ntawm kev txo qis hauv lwm yam khoom.
PP Homopolymer thiab PP Copolymer Applications
Cov ntawv thov yuav luag zoo ib yam vim yoglawv cov khoom siv dav dav. Yog li ntawd, kev xaiv ntawm ob cov ntaub ntawv no feem ntau yog ua los ntawm cov txheej txheem tsis yog txheej txheem.
Khaws cov ntaub ntawv hais txog cov khoom ntawm cov thermoplastic ua ntej yog ib txwm muaj txiaj ntsig. Qhov no pab xaiv cov thermoplastic zoo rau daim ntawv thov. Nws kuj tseem pab ntsuas seb qhov kev siv qhov kawg yuav tsum ua tiav lossis tsis ua. Nov yog qee cov khoom tseem ceeb thiab cov txiaj ntsig ntawm polypropylene:
Melting point ntawm polypropylene.Lub melting point ntawm polypropylene tshwm sim nyob rau hauv ib tug ntau yam.
Homopolymer: 160-165 degree
Copolymer: 135-159 degree
Qhov ntom ntawm polypropylene.PP yog ib qho ntawm cov polymers lightest ntawm tag nrho cov khoom yas. Cov yam ntxwv no ua rau nws muaj kev xaiv tsim nyog rau kev siv lub teeb yuag / hnyav-txuag.
Homopolymer: 0 904-0.908 g/cm3
Random copolymer: 0 904-0.908 g/cm3
Impact copolymer: 0 898-0.900 g/cm3
Polypropylene tshuaj tiv thaiv
Kev tiv thaiv zoo heev rau diluted thiab concentrated acids, alcohols, thiab bases
Kev tiv thaiv zoo rau aldehydes, esters, aliphatic hydrocarbons, thiab ketones
Kev txwv tsis pub muaj ntxhiab thiab halogenated hydrocarbons thiab oxidizing tus neeg sawv cev
Lwm yam nqi
Flammability: Polypropylene yog cov khoom siv hluav taws kub heev
PP khaws cov khoom siv hluav taws xob thiab hluav taws xob ntawm qhov kub siab, nyob rau hauv cov av noo, thiab thaum submerged hauv dej. Nws yog dej-repellent yas
PP muaj kev tiv thaiv zoo rau ib puag ncig kev ntxhov siab thiab tawg
Nws yog rhiab heev rau microbial tawm tsam (cov kab mob, pwm, thiab lwm yam)
Nws pom zoo tiv thaiv kom tsis muaj menyuam
Polymer additives xws li clarifiers, nplaim retardants, iav fibers, minerals, conductive fillers, lubricants, pigments, thiab ntau lwm yam additives yuav ntxiv txhim kho PP lub cev thiab / los yog txhua yam khoom. Piv txwv li, PP muaj kev tiv thaiv tsis zoo rau UV, yog li lub teeb stabilization nrog hindered amines txhim kho lub neej kev pab cuam piv rau cov tsis hloov pauv polypropylene.