Cov khoom siv raw polypropylene (PP) ntawm lub hnab ntim ntau tau 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). Yog li dab tsi yog qhov zoo, qhov tsis zoo thiab kev siv PP?
1. Homo polypropylene (PP-H)
Nws yog polymerized los ntawm ib qho polypropylene monomer, thiab cov saw hlau molecular tsis muaj ethylene monomer, yog li qhov tsis tu ncua ntawm cov saw molecular yog siab heev, yog li cov khoom muaj crystalline siab thiab tsis zoo cuam tshuam kev ua haujlwm. Txhawm rau txhim kho qhov brittleness ntawm PP-H, qee cov khoom siv raw khoom kuj tseem siv txoj hauv kev sib xyaw polyethylene thiab ethylene-polypropylene roj hmab los txhim kho cov tawv tawv ntawm cov khoom, tab sis nws tsis tuaj yeem daws qhov teeb meem ntev ntawm kev kub ntxhov ntawm PP. -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. Yuav siv tau rau txoj hlua khi, tshuab raj, txhuam, hlua, hnab ntim, cov khoom ua si, cov ntaub ntawv, 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 tsis sib haum xeeb: thaum hluav taws kub hnyiab, cov hlau yog tiaj, thiab nws tsis ntev.
2. Random (random) co polymerized polypropylene (PP-R)
Nws yog tau los ntawm co polymerization ntawm polypropylene monomer thiab ib tug me me ntawm ethylene (1-4 feem pua) monomer nyob rau hauv qhov kev txiav txim ntawm tshav kub, siab thiab catalyst. Cov ethylene monomer yog random thiab randomly faib mus rau hauv cov saw ntev ntawm polypropylene. Qhov sib ntxiv ntawm ethylene txo cov crystalline 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, cov ntsiab lus ethylene monomer thiab lwm yam ntsuas muaj qhov cuam tshuam ncaj qha rau lub sijhawm ntev thermal stability, txhua yam khoom thiab kev ua haujlwm ntawm cov khoom. Qhov ntau random faib ntawm ethylene monomer nyob rau hauv polypropylene molecular saw, qhov tseem ceeb tshaj qhov 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 saj zawg zog), zoo transparency, zoo gloss.
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 kuj yog siab, feem ntau 7 mus rau 15 feem pua, 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.
Qhov zoo: kev cuam tshuam zoo dua qub, 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 puag ncig ntev