Polypropylene (PP) yog ib qho nyuaj crystalline thermoplastic siv nyob rau hauv cov khoom siv niaj hnub.Muaj ntau hom PP muaj: homopolymer, copolymer, cuam tshuam, thiab lwm yam. Nws cov khoom siv kho tshuab, lub cev, thiab tshuaj lom neeg ua haujlwm zoo hauv kev siv xws li tsheb thiab kev kho mob mus rau ntim.
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, cov khoom siv, thiab cov rooj tog zaum.
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 ntawm propene thiab ethane:
1. 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 hloov tau yooj yim thiab optically ntshiab, ua rau lawv haum rau cov ntawv thov kom pom tseeb thiab rau cov khoom xav tau qhov zoo tshaj plaws.
2. Propylene block copolymer muaj cov ntsiab lus ethene siab 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 ua ke propylene random copolymer theem uas muaj cov ntsiab lus ethylene ntawm 45-65% raug xa mus rau PP cuam tshuam copolymer.Kev cuam tshuam copolymer yog siv hauv ntim khoom, khoom siv hauv tsev, zaj duab xis, thiab cov yeeb nkab siv, nrog rau hauv cov tsheb thiab hluav taws xob..
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 lawv cov khoom sib koom ua ke.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 pab ntsuas qhov kawg siv yuav tsum tau ua kom tiav los yog tsis.Nov yog qee cov khoom tseem ceeb thiab cov txiaj ntsig ntawm polypropylene:
Melting point ntawm polypropylene.Lub melting point ntawm polypropylene tshwm sim ntawm ib tug ntau yam.
● Homopolymer: 160-165 ° C
● Copolymer: 135-159 ° C
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 lub teeb yuag / hnyav - txuag daim ntawv thov.
● 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
● Ua tau zoo heev rau diluted thiab concentrated acids, alcohols, thiab bases
● Zoo tiv thaiv aldehydes, esters, aliphatic hydrocarbons, thiab ketones
● Txwv tsis pub muaj ntxhiab tsw thiab halogenated hydrocarbons thiab oxidizing tus neeg sawv cev
Lwm yam nqi
● PP khaws cov khoom siv hluav taws xob thiab hluav taws xob ntawm qhov kub siab, nyob rau hauv cov av noo, thiab thaum submersed 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.
Disadvantages ntawm Polypropylene
Tsis zoo tiv thaiv UV, cuam tshuam, thiab khawb
Cov cua kub hauv qab -20 ° C
Qhov kub thiab txias, 90-120 ° C
Tawm tsam los ntawm oxidizing acids heev, swells sai hauv cov kuab tshuaj chlorinated thiab aromatics
Thaum tshav kub kub-aging stability yog adversely cuam tshuam los ntawm kev sib cuag nrog hlau
Tom qab molding qhov loj me hloov pauv vim muaj kev cuam tshuam crystallinity
Cov xim tsis zoo adhesion
Kev siv ntawm polypropylene
Polypropylene yog dav siv nyob rau hauv ntau daim ntawv thov vim nws cov tshuaj lom neeg tsis kam thiab weldability.Qee qhov kev siv ntawm polypropylene muaj xws li:
Ntim Cov Ntawv Thov
Cov khoom thaiv zoo, lub zog siab, zoo nto tiav, thiab tus nqi qis ua rau polypropylene zoo tagnrho rau ntau daim ntawv thov ntim.
Kev ntim khoom yooj yim.PP films 'zoo heev optical clarity thiab tsis tshua muaj ya raws-vapor kis tau tus mob ua rau nws haum rau siv nyob rau hauv cov zaub mov ntim.Lwm lub khw muaj xws li shrink-film overwrap, electronic industry films, graphic arts applications, and disposable diaper tabs and closed.PP zaj duab xis yog muaj xws li cam khwb cia zaj duab xis los yog bi-axially orientated PP (BOPP).
Kev ntim khoom nruj.PP yog tshuab moulded los tsim cov thawv, lub raj mis, thiab lub lauj kaub.PP nyias-walled ntim yog feem ntau siv rau ntim khoom noj.
Cov khoom siv.Polypropylene yog siv nyob rau hauv ntau yam khoom siv hauv tsev thiab siv cov khoom siv, nrog rau cov khoom siv translucent, cov khoom siv hauv tsev, rooj tog zaum, khoom siv, lub nra, thiab cov khoom ua si.
Automotive applications.Vim nws cov nqi qis, cov khoom siv kho tshuab zoo heev, thiab moldability, polypropylene yog siv dav hauv cov khoom siv tsheb.Cov ntawv thov tseem ceeb suav nrog cov roj teeb thiab cov tais, lub pob, cov hlua khi, cov hlua sab hauv, cov cuab yeej siv, thiab qhov rooj trims.Lwm cov yam ntxwv tseem ceeb ntawm kev siv tsheb ntawm PP suav nrog qis coefficient ntawm linear thermal expansion thiab lub ntiajteb txawj nqus tshwj xeeb, tshuaj lom neeg ua haujlwm siab thiab huab cua zoo, kev ua haujlwm, thiab kev cuam tshuam / nruj sib npaug.
Fibers thiab fabrics.Ib qho loj ntim ntawm PP yog siv nyob rau hauv lub lag luam ntu hu ua fibers thiab fabrics.PP fiber ntau yog siv rau hauv ntau daim ntawv thov, suav nrog raffia / slit-film, daim kab xev, strapping, bulk nruam filament, staple fibers, spun bond, thiab nruam filament.PP hlua thiab twine muaj zog heev thiab ya raws-resistant, haum rau marine daim ntaub ntawv.
Kev siv tshuaj kho mob.Polypropylene yog siv rau hauv ntau yam kev siv kho mob vim muaj tshuaj lom neeg thiab cov kab mob ua haujlwm siab.Tsis tas li ntawd, qib kho mob PP nthuav tawm qhov ua tau zoo rau kev ua kom tsis muaj menyuam.
Cov koob txhaj tshuaj pov tseg yog cov ntawv thov kho mob feem ntau ntawm polypropylene.Lwm daim ntawv thov muaj xws li kev kho mob vials, cov cuab yeej kuaj mob, cov tais diav petri, lub raj mis tso rau hauv lub raj, lub raj mis, cov tais zaub mov, lauj kaub, thiab cov thawv ntim tshuaj.
Cov ntawv thov kev lag luam.Cov nplooj ntawv polypropylene tau siv dav hauv kev lag luam los tsim cov kua qaub thiab tshuaj tso tsheb hlau luam, cov nplooj ntawv, cov kav dej, Cov Thawv Thauj Rov Qab (RTP), thiab lwm yam khoom vim nws cov khoom zoo li lub zog tensile siab, tsis kam mus rau qhov kub thiab txias, thiab corrosion kuj.
PP yog 100% recyclable.Tsheb roj teeb rooj, teeb liab teeb, roj teeb cables, brooms, txhuam, thiab ice scrapers yog ob peb yam piv txwv ntawm cov khoom uas yuav ua tau los ntawm recycled polypropylene (rPP).
PP cov txheej txheem rov ua dua tshiab feem ntau suav nrog kev yaj ntawm cov yas pov tseg rau 250 ° C kom tshem tawm cov kab mob tom qab tshem tawm cov khoom seem nyob hauv lub tshuab nqus tsev thiab ua kom khov ntawm ze li 140 ° C.Cov PP rov qab no tuaj yeem sib xyaw nrog PP nkauj xwb ntawm tus nqi txog li 50%.Qhov kev sib tw tseem ceeb hauv PP recycling yog cuam tshuam nrog nws cov nyiaj tau txais txiaj ntsig - tam sim no ze li ntawm 1% PP lub raj mis rov qab siv dua, piv rau 98% rov ua dua tus nqi ntawm PET & HDPE fwj ua ke.
Kev siv PP yog suav tias yog kev nyab xeeb vim nws tsis muaj txiaj ntsig zoo los ntawm kev ua haujlwm kev noj qab haus huv thiab kev nyab xeeb ntawm kev pom, hais txog tshuaj lom neeg.Yog xav paub ntxiv txog PP mus saib peb phau ntawv qhia, uas suav nrog cov ntaub ntawv ua haujlwm thiab ntau ntxiv.
Post lub sij hawm: Jul-03-2023