PP kev faib tawm thiab cov khoom zoo thiab qhov tsis zoo:
Polypropylene (PP) muab faib ua homo-polymer polypropylene (PP-H), thaiv (kev cuam tshuam) co-polymer polypropylene (PP-B) thiab random (random) co-polymer polypropylene (PP-R).Dab tsi yog qhov zoo, qhov tsis zoo thiab kev siv PP?Qhia rau koj hnub no.
1. Homo-polymer polypropylene (PP-H)
Nws yog polymerized los ntawm ib qho propylene monomer, thiab cov saw hlau molecular tsis muaj ethylene monomer, yog li qhov tsis tu ncua ntawm cov saw hlau molecular yog siab heev, yog li cov khoom muaj crystallinity siab thiab kev ua haujlwm tsis zoo.Txhawm rau txhim kho lub brittleness ntawm PP-H, qee cov khoom siv raw khoom kuj tseem siv txoj kev sib xyaw polyethylene thiab ethylene-propylene roj hmab los txhim kho cov tawv tawv ntawm cov khoom, tab sis nws tsis tuaj yeem daws qhov teeb meem ntawm kev kub ntxhov ntawm PP mus ntev. -H.kev ua tau zoo
Qhov zoo: lub zog zoo
Disadvantages: tsis muaj kev cuam tshuam tsis zoo (ntau dua), tsis zoo toughness, tsis zoo seem stability, yooj yim laus, tsis zoo rau lub sij hawm ntev tshav kub stability
Daim ntawv thov: Extrusion tshuab qib, cov xov paj tiaj tiaj, qib txhaj tshuaj molding, qib fiber ntau, cua tshuab qib.Nws tuaj yeem siv rau cov hlua khi, tshuab raj, txhuam, hlua, cov hnab ntim khoom, cov khoom ua si, cov ntawv tais ceev tseg, cov khoom siv hluav taws xob, cov khoom siv hauv tsev, microwave noj su lub thawv, cov thawv ntim khoom, cov ntawv qhwv ntawv
Txoj kev ntxub ntxaug: thaum hluav taws kub hnyiab, cov hlau yog tiaj, thiab tsis ntev.
2. Random (random) copolymerized polypropylene (PP-R)
Nws yog tau los ntawm co-polymerization ntawm propylene monomer thiab ib tug me me ntawm ethylene (1-4%) monomer nyob rau hauv qhov kev txiav txim ntawm tshav kub, siab thiab catalyst.Cov ethylene monomer yog randomly thiab randomly faib mus rau hauv cov saw ntev ntawm propylene.Qhov sib ntxiv ntawm ethylene txo cov crystallinity thiab melting point ntawm lub polymer, thiab txhim kho cov kev ua tau zoo ntawm cov khoom nyob rau hauv cov nqe lus ntawm kev cuam tshuam, lub sij hawm ntev hydrostatic siab tsis kam, lub sij hawm ntev thermal oxygen aging, thiab yeeb nkab ua thiab molding.PP-R molecular saw qauv, ethylene monomer cov ntsiab lus thiab lwm yam ntsuas muaj qhov cuam tshuam ncaj qha rau lub sijhawm ntev thermal stability, cov khoom siv kho tshuab thiab cov khoom ua haujlwm ntawm cov khoom.Qhov ntau random kev faib ntawm ethylene monomer nyob rau hauv propylene molecular saw, qhov tseem ceeb ntawm kev hloov ntawm polypropylene zog.
Qhov zoo: kev ua tau zoo, kev ua haujlwm siab, siab rigidity, zoo tshav kub tsis kam, zoo dimension stability, zoo heev kub kub toughness (zoo yooj), zoo transparency, zoo gloss.
Qhov tsis zoo: qhov ua tau zoo tshaj plaws hauv PP
Daim ntawv thov: Extrusion tshuab qib, qib zaj duab xis, qib txhaj tshuaj molding.Tubes, shrink films, drip fwj, siab pob tshab ntim, pob tshab hauv tsev cov khoom, pov tseg syringes, wrapping ntawv films
Kev txheeb xyuas txoj kev: nws tsis tig dub tom qab ignition, thiab tuaj yeem rub tawm ib lub voj voog ntev
3. Thaiv (kev cuam tshuam) co-polymer polypropylene (PP-B)
Cov ntsiab lus ethylene yog qhov siab, feem ntau 7-15%, tab sis vim tias qhov tshwm sim ntawm kev sib txuas ntawm ob lub ethylene monomers thiab peb lub monomers hauv PP-B yog siab heev, nws qhia tau hais tias txij li thaum ethylene monomer tsuas muaj nyob rau hauv lub block theem, qhov tsis tu ncua. PP-H txo qis, yog li nws tsis tuaj yeem ua tiav lub hom phiaj ntawm kev txhim kho kev ua haujlwm ntawm PP-H raws li cov ntsiab lus melting, lub sij hawm ntev hydrostatic siab tsis kam, lub sij hawm ntev thermal oxygen aging thiab yeeb nkab ua thiab tsim.
Cov txiaj ntsig zoo: kev cuam tshuam zoo dua, qee qhov kev sib tw ntawm rigidity txhim kho kev cuam tshuam lub zog
Disadvantages: low transparency, tsis tshua muaj gloss
Daim ntawv thov: Extrusion qib, txhaj tshuaj molding qib.Bumpers, nyias-walled khoom, strollers, khoom ua si, nra, xim thoob, roj teeb thawv, nyias-walled khoom
Kev txheeb xyuas txoj kev: nws tsis tig dub tom qab ignition, thiab tuaj yeem rub tawm ib lub voj voog ntev
Cov ntsiab lus tseem ceeb: tiv thaiv hygroscopicity, acid thiab alkali corrosion kuj, solubility tsis kam, tsis zoo oxidation kuj ntawm qhov kub thiab txias
Tus nqi ntws MFR ntawm PP yog nyob rau hauv thaj tsam ntawm 1-40.PP cov ntaub ntawv nrog tsawg MFR muaj kev cuam tshuam zoo dua tab sis qis dua ductility.Rau tib MFR cov ntaub ntawv, lub zog ntawm cov co-polymer hom yog siab dua li homo-polymer hom.Vim yog crystallization, qhov shrinkage ntawm PP yog siab heev, feem ntau 1.8-2.5%.
