Hla-txuas polypropylene: nta, specifications thiab tshuaj xyuas

2024 Tus sau: Howard Calhoun | [email protected]. Kawg hloov kho: 2023-12-17 10:28

Hla-txuas polypropylene tseem hu ua supermolecular thiab yog qhov hloov kho ntom ntom ntawm cov khoom ethylene polymerization. Nws muaj ib tug network molecular qauv thiab intermolecular bonds. Cov yam ntxwv ntawm polypropylene yog qhov tshwj xeeb, vim tias lawv tso cai rau siv rau hauv thaj chaw tsis tuaj yeem nkag mus rau cov qauv tsis sib xws.

Qee yam ntxwv

Cov khoom siv tsis sib xws yog tau txais los ntawm kev cuam tshuam rau qhov tsis tshua muaj siab thaum muaj cov catalysts. Nws muaj cov loj polymer molecules nrog sab ceg. Feem ntau ntawm lawv yog nyob rau hauv ib hom dawb "floating" nyob rau hauv qhov chaw ntawm lub molecules. Kev sib txuas sib txuas tso cai rau ua tiav cov ntawv cog lus sab uas tsim kom muaj kev sib txuas sib txuas. Raws li qhov tshwm sim, nws tuaj yeem tau txais cov qauv tshwj xeeb muaj zog, uas muaj cov qauv siv lead ua lattice ntawm cov khib nyiab.

Thaum siv cov txheej txheem sib txawv sib txawv, cov khoom siv nrog qee yamtus naj npawb ntawm daim ntawv cog lus, uas qhia tias muaj zog ntau dua lossis tsawg dua impressive. Qee qhov sib txawv ntawm crosslinked polypropylene tau txais nyob rau hauv lub xub ntiag ntawm hydrogen peroxide thiab muaj qhov feem pua siab tshaj ntawm crosslinking, uas tuaj yeem ncav cuag 85%. Feem ntau thiab siv tau rau hauv ntau yam khoom yog silane polymer, uas muaj 70% kev sib koom ua ke.

Txoj kev sib txuas yuav yog 60% yog tias cov thev naus laus zis muab rau cov qauv hluav taws xob ntawm kev tsim khoom. Nyob rau hauv lub xub ntiag ntawm nitrogen, cov khoom yog tsim nrog es complex tshuaj tiv thaiv tej yam kev mob. Raws li qhov tshwm sim, nws muaj peev xwm ua tiav tib yam 70% kev sib txuas sib txuas. Crosslinked polypropylene nrog cov feem pua ntawm crosslinking yog kim dua thiab muaj qhov ua kom tawg siab tshaj plaws, siab melting point thiab muaj kev cuam tshuam zoo heev. Xws li kev sib txuas ua ke ua rau nws muaj peev xwm ua tau kom muaj zog dua thiab tsis tshua muaj plasticity ntawm cov khoom, uas tsis qhia qhov zoo, tab sis tso cai rau koj kom tau txais ntau yam ntaub ntawv uas yuav muaj lawv lub hom phiaj.

Specifications

Cross-linked polypropylene ua tau zoo raws li ntau cov khib nyiab, thiab qee qhov ntau yam ua tau zoo dua hauv kev tiv thaiv kev tiv thaiv thiab kav ntev. Qhov ceev ntawm cov khoom yog 940 kg / m 3. combustion tshwm sim ntawm qhov kub ntawm +400 ˚С, thaum cov khoom decomposes rau hauv dej thiab carbon dioxide. Melting kub ncav cuag +200 ˚С.

Ntxiv nta

Elongation ntawm so nws txawv ntawm 350 txog 800%. Qhov kev teeb tsa no txiav txim siabmechanical zog. Hla-txuas polypropylene yog tus cwj pwm los ntawm kev hloov pauv siab. Nws muaj kev cuam tshuam-tiv taus thaum raug kub hnyiab txog -50 ˚С. Lub neej kev pab cuam ntawm cov khoom nyob rau hauv tus qauv tej yam kev mob tshaj 50 xyoo. Cov thermal conductivity ntawm cross-linked polypropylene yog 0.38 W / mK.

Lub ntsiab nta

Cov khoom piav qhia muaj ntau yam zoo, ntawm cov uas yuav tsum tau qhia:

• siab tensile zog;
• biological sustainability;
• muaj peev xwm tiv taus qhov kub siab;
• zoo dielectric zog;
• kev tawm tsam;
• resistance rau alkalis, acids thiab organic solvents.

Cov khoom muaj lub zog tensile zoo thiab lub zog tensile. Txawm tias muaj qhov kub thiab txias, nws tsis yog npog nrog cov kab nrib pleb. Nws tsis yog biodegradable thiab tuaj yeem tiv taus txawm tias kub kub.

Cov kav dej ua los ntawm kev sib txuas ntawm cov polypropylene yog cov kav ntev thiab tso cai rau koj kom ua tiav cov yeeb nkab zoo sib txuas. Qhov tseeb no qhia tau hais tias muaj peev xwm siv cov khoom siv hauv kev tsim kho kev sib txuas lus hauv cheeb tsam seismic.

tsis zoo thiab tawm tswv yim txog lawv

Raws li cov neeg siv khoom, cov khoom piav qhia muaj nws qhov tsis zoo. Piv txwv li, cross-linked polypropylene nthuav tawm tsis kam tiv thaiv hnub ci hluav taws xob. Yog tias ultraviolet raug rau cov kav dej ntev ntev, cov khoom siv yuav pibtawg, ua nkig.

Cov neeg yuav khoom tseem hais ntxiv tias cov pa oxygen puas tsuaj rau polypropylene yog tias nws nkag mus rau hauv cov qauv molecular. Txawm li cas los xij, cov teeb meem no tuaj yeem raug tshem tawm los ntawm kev tiv thaiv cov khoom lossis ntxiv cov tshuaj tshwj xeeb ntawm theem ntawm kev tsim khoom.

Polyethylene lossis polypropylene

Ntau zaus, cov neeg siv khoom xav paub xaiv dab tsi - hla-txuas polyethylene lossis polypropylene. Txhawm rau teb nws, koj yuav tsum paub koj tus kheej nrog cov yam ntxwv ntawm cov khoom siv thiab nkag siab txog thaj chaw ntawm daim ntawv thov ntawm txhua tus. Cov ntaub ntawv no yog tsim los ntawm ntau txoj kev. Piv txwv li, polypropylene, uas tseem hu ua PP, yog tau los ntawm polymerization ntawm propylene molecules. Tab sis cross-linked polyethylene, qhia los ntawm cov ntawv PE-X, yog tsim los ntawm kev siv thev naus laus zis ntawm lub cev lossis tshuaj sib txuas ntawm ethylene molecules.

Ob txoj kev xaiv muaj qhov hnav tsis kam thiab tib lub zog tensile thaum tawg. Tab sis PP tiv taus ntau dua rau kev tawg, thiab nyob rau hauv cov khoom hnyav nws qhia tau tias kev ua haujlwm tsis zoo dua li PEX. Tsis tas li ntawd, cross-linked polyethylene muaj qhov yooj yooj yim, vim tias qhov tsawg kawg yog khoov ntawm cov khoom los ntawm nws yog 5D. Tab sis rau polypropylene, daim duab no yog 8D.

Cov kav dej ua los ntawm cov ntaub ntawv no muaj lub cim xeeb, uas tso cai rau lawv rov qab kho lawv cov duab thaum kub txog +100 ˚С. Koj tuaj yeem sib piv cov ntsiab lus melting. Rau kev sib txuas ntawm polyethylene, nws yog 30 ˚С siab dua, tab sis cov kav dej zoo li no tau siv rau hauv qhov kub thiab txias.hom.

Rau ob yam khoom, qhov siab tshaj plaws ua haujlwm kub yog tib yam thiab yog +90 ˚С. Ntawm no nws tsuas yog tsim nyog los qhia meej tias lub sijhawm ua haujlwm muaj feem cuam tshuam ntawm qhov sib txawv ntawm qhov kub thiab txias. Raws li kev txwv qis, nws txawv heev. Piv txwv li, rau polypropylene, qhov kub tseem ceeb yog -20 ˚С, thaum rau kev sib txuas ntawm polyethylene, kev cuam tshuam yuav nyob twj ywm txog -50 ˚С.

Tshuaj xyuas kev siv cov khoom siv rau tsev neeg xav tau

Heated pem teb ua los ntawm cross-linked polypropylene, raws li cov masters hauv tsev, yuav ua tau zoo heev. Cov kav dej zoo li no tau suav tias yog niaj hnub no qhov kev xaiv niaj hnub tshaj plaws, txij li lawv cov yam ntxwv ua tau raws li qhov yuav tsum tau ua. Ntawm qhov tsis txaus ntawm no, raws li cov neeg yuav khoom, ib tus tuaj yeem nco txog qhov hloov pauv me me, vim tias cov khoom tsis tuav lawv cov duab zoo thaum lub sijhawm teeb tsa.

Hla-txuas polypropylene rau cua sov kuj siv ntau zaus. Txawm li cas los xij, ntawm no, raws li cov neeg siv khoom hais txog, teeb meem tuaj yeem tshwm sim vim yog cov pa oxygen permeability ntawm cov khoom, uas tuaj yeem ua rau muaj kev cuam tshuam ntawm cov txheej txheem corrosion ntawm cov khoom siv. Yog li ntawd, rau cov cua sov hauv qab, piv txwv li, cov kws tshaj lij qhia txog kev siv cov kav dej nrog kev tiv thaiv diffusion.

Nyob hauv kaw

Yog tias koj tseem tsis tuaj yeem txiav txim siab rau koj tus kheej qhov twg zoo dua - polypropylene lossis cross-linked polypropylene, ces koj yuav tsum paub tias tom kawg yog qhov zoo vim tias nws muaj qhov kub siab melting point. Txawm hais tias cov khoom no yog combustible, nws yuav tsum tau kub ntawm +400 ˚С.

Yog tias koj siv cov khoom ua los ntawm kev sib txuas ntawm polypropylene ntawm qhov kub txog +75 ˚С, lawv yuav npaj ua haujlwm li 50 xyoo. Tab sis yog tias cov xwm txheej tau nrog kev kub siab thiab txias txias hauv +95 ˚С, lub neej kev pab cuam tuaj yeem txo mus rau 15 xyoo. Nyob rau tib lub sijhawm, cov khoom siv yuav tsis deformed, yog li nws tuaj yeem ruaj ntseg ntsia tau rau hauv ib txheej ntawm plaster hauv cov chav uas qhov zoo nkauj ntawm sab hauv yog qhov tseem ceeb.