Kev Tshawb Fawb thiab Kev Txheeb Xyuas ntawm Yam Cuam Tshuam Dab Tuag Index ntawm Polypropylene

1 Cov ntsiab lus tseem ceeb ntawm cov tawv ntoo

Melt Performance index, MFI, tseem hu ua huab ndlwg, xa mus rau qhov nyhav ntawm lub polymer yaj dhau los ntawm tus txheej txheem tuag tsis pub dhau kaum feeb ntawm qhov kub thiab txias. Qhov kub no feem ntau yog 230 degree Celsius, lub pob yog 2160 grams, thiab tus qauv tuag yog 2.095 hli. Qhov ntau dua ntawm lub yaj Performance index, qhov zoo dua lub fluidity ntawm polymer yaj thiab qis dua qhov nruab nrab molecular phaus.

Qhov ua haujlwm tseem ceeb ntawm txoj kev kuaj no yog raws li nram no: Ua ntej, cov khoom siv tawv nqaij yuav tsum tau kuaj, uas yog, yas, muab tso rau hauv ib lub me me, thiab ib txoj hlab ntsha muaj ib txoj kab ntawm 2.095 mm thiab ntev ntawm 8 hli txuas nrog qhov kawg ntawm lub tank. Tom qab ntawd, tom qab cua sov rau 230 degrees, nyem thiab ntsuas qhov hnyav ntawm cov khoom extruded hauv kaum feeb, uas yog qhov Performance index khiav ntawm cov yas.

2 cov txheej txheem qauv polypropylene

Polypropylene, los yog PP, yog ib qho thermoplastic polymer. Nws muaj peev xwm raug faib ua peb hom raws li txoj hauj lwm ntawm methyl pawg: isotactic polypropylene, polypropylene random, thiab syndiotactic polypropylene. Cov khoom muaj xws li lub cev nqaij daim tawv, cov khoom siv dag zog, cov khoom thermal, tshuaj ruaj khov, hluav taws xob thiab cov huab cua. Lub ntsiab nta ntawm polypropylene muaj xws li cov hauv qab no:

Qhov zoo: (1) Qhov sib npaug txheeb ze yog tsawg, tsuas yog nruab nrab ntawm 0.89 thiab 0.91, uas yog ib qho ntawm ntau hom kev lightest.

(2) Cov khoom siv zoo, kev ua rau muaj zog, thiab kev ua zoo molding.

(3) Kev ntsuas kub muaj peev xwm siab li 110 degrees Celsius mus rau 120 degree Celsius, thiab muaj cua kub zoo.

(4) Nws muaj hluav taws xob zoo hluav taws xob thiab tsis yooj yim rau cov tshuaj thiab tsis nqus dej.

(5) Zoo dua transparency, ntshiab kev ntxhib los mos, non-toxic thiab harmless.

Cov tsis zoo: (1) tsis muaj kev tiv thaiv tsis txias, raug rau teebmeem, kub thiab cua.

(2) Nws tsis yog yooj yim xim, thiab qhov tiv thaiv taw tes yog tsawg.

(3) Tsis muaj zog.

3Influencing yam ntawm polypropylene qhuav index

3.1 Cov teeb meem uas cuam tshuam rau lub qauv ntawm yaj ntawm polypropylene

3.1.1 Tshawb nrhiav pom kev ntawm hydrogen rau ntawm kev txhuam ntawm cov pob zeb polypropylene

Nyob rau hauv qhov kev txiav txim ntawm Ziegler-Natta, propylene ua ib qho phenomenon polymerization, ua rau cov saw kaw thiab cov ntaub ntawv xa mus rau hauv cov chaw dhia ntawm polypropylene. Rau lub hauv paus ntawm qhov zoo tagnrho cov ntawv txiav tawm kom tiav cov ntaub ntawv hloov, cov kev ua kom tsis muaj kev txwv tsis yog pov tseg, thiab cov polymerization yam ntxwv ntawm cov thawj lub tshuab catalytic tsis hloov. Muaj ob feem ntawm txoj kev sib rho tas nrho: ib qho yog qhov kev kaw qhov kev lag luam tshwm sim hauv qhov kev txiav txim ntawm cov khoom siv hluav taws xob. Ntawm lawv, dej, leej faj, arsenic thiab lwm yam tshuaj yeeb dej caw uas tuaj yeem ua rau cov hniav tsis zoo yuav ua rau cov saw kaw. Qhov thib ob yog qhov hloov ntawm β-H. Nyob hauv tus txheej txheem ntawm cov khoom siv sib txuas, cov chaw dhia ua si muaj kev txuas mus rau hauv cov kev taw qhia txog aluminium thiab olefin, thiab nyob rau hauv cov txheej txheem no, nws yog ib qho tsim nyog kom ntxiv hydrogen raws li cov neeg muag khoom hloov mus rau kev tswj hwm lub cev. lub hom phiaj ntawm.

3.1.2 Lub suab thaj ntawm polypropylene yog cuam tshuam los ntawm txoj kev hydrogenation

Hom tshuaj hydrogenation mas nws muaj ob hom kev ua qauv sib luag thiab muab faib rau hydrogenation.

Hydrogenation yuav tsum sib xyaw ua ke: Hydrogen yuav ua tau zoo li nyob rau hauv lub thawv polymerization, thiab cov nyhuv diffusion zoo dua, yog li ntawd qhov molecular phaus hauv cov reactor yog ze heev thiab cov khoom faib yog nqaim. Nyob rau tib lub sijhawm, thaum uas tig mus rau hydrogenation tsis yooj yim yog kom nkag siab qhov nyiaj hydrogenation.

Kev faib hydrogenation: yooj yim rau kev khiav lag luam, txoj kev ua yooj yim, tsuas yog xav tau ntxiv ib qho nqi ntawm hydrogen rau reactor. Txawm li cas los, hydrogen ntxiv rau tom kawg ob reactors los ntawm kev tua slurry entrainment yooj yim cuam tshuam rau cov nqi ntawm hydrogenation thiab diffusion nyhuv ntawm hydrogen.

Raws li qhov ntsuam xyuas ntawm cov tswv yim ua tau, tsis muaj qhov sib txawv ntawm cov khoom siv ntawm lub ntsuas ntawm qhov sib piv ntawm qhov sib piv ntawm hydrogenation thiab cov kev sib faib tawm hydrogenation. Lub ntsiab qhov sib txawv yog nyob rau hauv qhov teeb meem ntawm qhov nqaim faib ntawm molecular qhov ceeb thawj.

3.1.3 Lub suab thaj ntawm polypropylene yog cuam tshuam los ntawm cov degree ntawm hydrogen diffusion

Nyob rau hauv cov txheej txheem no, hydrogen diffusion thiab hydrogenation tshua yog tau los ntawm kev ntxhov siab thiab kev ua pa. Tus nplawm ceev yog ceev dua, thiab cov nyhuv diffusion ntawm hydrogen zoo dua. Txawm li cas los xij, feem ntau ntawm cov pa roj carbon dioxide yog feem ntau zoo dua qub los ntawm kev ua pa ntawm cov pa roj hauv cov txheej txheem. Thaum nkag mus rau hauv lub taub hau, cov pa roj ntsha mus rau ntawm lub qab daus ntawm lub qab npoo los ntawm daim npav, ua kom nce qhov sib tsoo ntawm hydrogen thiab kua theem propylene, ua rau lub uniformity ntawm diffusion, txhawb txoj kev hloov cov khoom siv, nce cov nyhuv ntawm kev tshem tawm tshav kub, thiab pab kom zoo siab. Zus tau tsim ntawm cov khoom ntxhua tshuaj qauv polypropylene txo cov zaus zaus ntawm cov dej ntshiab thiab ua tiav lub hom phiaj ntawm kev ua rau cov huab cua.

3.2 Tshawb nrhiav kev txuam ntawm cov ntaub ntawv raw ntawm yaj dej ntawm cov tshuaj polypropylene

Nyob rau hauv cov txheej txheem no, tus ntaus ntawv siv propylene ua ib qho polymerization monomer, hydrogen raws li ib tug neeg hloov tsheb mus muag, thiab ib tug nqi tsim nyog ntawm Ziegler-Natta ua tus catalyst los pab txhawb cov tshuaj tiv thaiv polymerization. Cov txheej txheem ntawm cov khoom siv propylene muaj xws li: propylene purity, oxygen, carbon monoxide, arsenic, sulfur, alkanes, dej, carbon dioxide, thiab lwm yam., Carbon monoxide, sulfur, arsenic, oxygen, dej, unsaturated olefins, thiab dej thiab oxygen nyob rau hauv hydrogen, Nws yog ua tau kom qhov chaw ntawm lub catalyst kom tsis muaj zog thiab ua tsis tau. Hauv particular, cov qib high-efficiency catalyst muaj TiCl4, txawm hais tias tus neeg nyob tus neeg tsawg, tab sis nws muaj ib qho cwj pwm loj hauv cov huab hwm coj impurities hauv nruab nrab cov tshuaj tiv thaiv, uas yog ib qho yooj yim uas ua rau lom. Yog hais tias tus catalyst yog deactivated vim qaug tshuaj lom heev, nws yuav ua rau nws nyuaj rau lub polymerization khoom kom mus txog qhov kev qhia tau hais tias tsim yaj. Tsis tas li ntawd, muaj qee cov roj hauv propylene, tab sis nws tsis cuam tshuam rau kev ua ntawm catalyst, tab sis yog hais tias cov ntsiab lus ntau tshaj ib txhia, nws yuav nyob tau ntau qhov chaw ntawm cov tshuaj tiv thaiv, thiab txo qhov ib nrab siab ntawm hydrogen nyob rau hauv lub kettle, resulting nyob rau hauv kev nyuaj nyob rau hauv kev tswj lub qhuav index.

Nws tuaj yeem pom tau hais tias kev kho ntawm hydrogen thiab purification ntawm propylene ua rau kom muaj kev ruaj ntseg ntawm cov tawv ntoo.

3.3 Tshawb nrhiav kev tshwm sim ntawm cov khoom cua nyob rau hauv yaj dej ntawm cov qauv ntawm polypropylene

Cov lus 1 Kev sib raug zoo ntawm cov hom catalyst sib txawv thiab tawv tsim (tib qhov nyiaj hydrogenation)

Los ntawm kev soj ntsuam ntawm Table 1, hauv qhov xwm txheej ntawm tib hom nyiaj hydrogenation, txawv catalysts ua rau nyias txawv indices ntawm cov khoom. Nyuaj hais lus, muaj ntau qhov sib txawv ntawm hydrogen rhiab heev vim lub sijhawm uas cov catalyst yog formulated thiab cov muaj pes tsawg leeg ntawm cov catalyst. Yog li, yog tias nws yuav tsum tau hloov cov catalyst thaum lub txheej txheem ntau lawm, tus nqi ntawm hydrogenation yuav tsum tau kho kom tus yaj ntawm cov nqaij cia nyob hauv ib qho chaw ruaj khov.

Thaum lub ntsuas sov ntawm cov khoom tsim tau qis, qhov txawv ntawm cov dej ntawm lub ntsuas thiab qhov nyiaj hydrogenation ntawm thawj cov tshuaj tiv thaiv yog tsis loj. Txawm li cas los, thaum lub melt Performance Index ntawm cov khoom tsim yog siab, lub ntsiab ntawm cov yaj thiab cov nyiaj hydrogenation ntawm thawj cov tshuaj tiv thaiv yog siab. Muaj ntau qhov sib txawv. Yog li, thaum ua cov khoom, hydrogenation ntau nqi yuav tsum tau xaiv raws li tej yam kev mob ntawm cov khoom, thiab cov catalyst yuav tsum tau siv.

4 Xaus

Raws li ib nyuag qhia ntawm cov yaj cov cim thiab polypropylene, tsab xov xwm tshawb txog yam xwm txheej ntawm lub qauv ntawm cov ntoo ntawm polypropylene, thiab siv cov kev sim los soj ntsuam cov ntaub ntawv thiab kos cov lus xaus. Raws li qhov kev tshawb nrhiav yav dhau los, qhov nyiaj hydrogen thiab hom catalyst muaj feem xyuam zoo tshaj rau lub qauv ntawm cov tawv nqaij ntawm polypropylene thaum lub sij hawm polymerization. Nyob rau tib lub sijhawm, qhov nce ntawm cov nyiaj hydrogenation yuav ua rau kom cov dej tawg ntawm polypropylene. Txoj kev tov cov tshuaj antioxidants nrog antioxidants thiab hmoov kuj yuav cuam tshuam rau kev hloov ntawm polypropylene melt index. Cov ntaub ntawv raw thiab catalysts yuav ua rau cov kev hloov hauv cov tawv ntoo. Lwm txoj kev xaus

Txais tos xaiv peb qhuav dej nquag Performance index:

https://www.chinatestequipments.com/tests-on-plastic-raw-materials/melt-flow-index-tester/mfi-melt-flow-indexer-mfr-mvr-test-method.html