Polypropylene - melting point, khoom thiab yam ntxwv

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

Polypropylene, uas nws cov ntsiab lus melting yuav tsum paub rau koj yog tias koj npaj yuav siv cov khoom siv rau tus kheej, yog cov thermoplastic hluavtaws non-polar polymer uas yog nyob rau hauv chav kawm ntawm polyolefins.

rau kev siv

Polypropylene tseem hu ua cov khoom ntawm propylene polymerization. Cov khoom siv yog xim dawb thiab muaj cov qauv zoo. Nws tau txais los ntawm polymerization ntawm propylene. Polymerization yog nqa tawm nyob rau hauv siab ntawm 10 atmospheres, thaum tuav ib tug kub ntawm 80 ° C.

qauv molecular thiab melting point

Polypropylene, nws lub ntsiab lus melting yuav muaj npe hauv qab no, muab faib ua peb hom raws li hom qauv molecular:

• atactic;
• syndiotactic;
• Yisotactic.

Atactic polypropylene yog cov khoom zoo li roj hmab uas muaj qib siab ntawmfluidity. Nws melting point yog 80 ° C, thaum nws ceev yog 850 kg / m³. Cov khoom no kuj yog tus yam ntxwv los ntawm kev solubility siab hauv diethyl ether.

Sib txawv ntawm nws cov yam ntxwv los ntawm cov lus piav qhia saum toj no yog isotactic polypropylene nyob rau hauv uas nws muaj lub siab hloov pauv ntawm elasticity, nws qhov ceev nce mus txog 910 g / m³, thaum lub melting point yog ntau dua thiab txawv ntawm 165 txog 170 ° C. Cov khoom no yog tshuaj resistant.

Lub cev thiab txhua yam khoom thiab cov lus qhia

Polypropylene, lub melting point uas tau hais los saum no, txawv ntawm polyethylene nyob rau hauv nws qis ntom, uas yog 0.91 g / cm³. Tus nqi no yog ib qho rau cov yas. Cov ntaub ntawv piav qhia kuj nyuaj dua, uas tau tshwm sim hauv qhov tseeb tias nws muaj kev tiv thaiv siab rau kev puas tsuaj.

Nrog rau lwm yam, polypropylene yog tshav kub resistant, vim hais tias nws pib mos thaum kub txog 140 ° C. Cov ntsiab lus melting yog 175 ° C, ntxiv rau, cov khoom siv tau zoo tsis raug corrosion. Polypropylene tiv taus lub teeb, nrog rau oxygen. Kev taw qhia ntawm stabilizers txo qhov rhiab heev dua.

Polypropylene, uas nws lub ntsiab lus melting koj yuav xav tau yog tias koj npaj yuav siv cov khoom no, yuav coj txawv txawv thaum ncab nyob ntawm qhov kub thiab txias ntawm daim ntawv thov ntawm lub load. Qhov qis dua tus nqi ncab, qhov siab dua tus nqi ntawm cov khoom siv kho tshuab. NtawmHauv kev nro, qhov kev ntxhov siab tawg txawv ntawm 250 txog 400 kgf / cm², thaum lub elongation ntawm kev tawg yog li ntawm 200 txog 800%.

Lub ntsiab lus melting ntawm polypropylene ntawv, uas tau hais los saum toj no, tsis yog tib tus yam ntxwv uas cov neeg siv khoom ntiag tug txaus siab rau. Qee zaum lawv kuj txhawj xeeb txog qhov flexural modulus. Hauv cov lus piav qhia, nws tuaj yeem sib txawv ntawm 6700 txog 11900 kgf. Ntawm qhov tawm los, qhov txheeb ze elongation yog sib npaug li 10-20%. Kev cuam tshuam lub zog nrog lub thais yog 33-80 kgfcm / cm². Brinell hardness yog 6-6.5 kgf / mm².

Scope of application

Kev siv polypropylene yog qhov dav heev. Cov khoom siv yog siv rau kev tsim cov yeeb yaj kiab, qhov no suav nrog lawv cov ntim ntau yam. Ntawm lwm cov khoom, nws yog ib qho tsim nyog yuav tsum tau hais txog:

• bags;
• pipes;
• khob yas;
• tare;
• nthuav dav ntawm cov cuab yeej siv;
• khoom vaj khoom tsev;
• khoom siv hluav taws xob insulating;
• tsis-woven npuag.

Hauv kev tsim kho, polypropylene kuj tau pom nws daim ntawv thov, qhov twg nws yog siv rau kev co thiab suab nrov rwb thaiv tsev ntawm interfloor ceilings, nrog rau hauv cov tshuab uas tau nruab nrog lub tshuab "floating floor" technology. Thaum polypropylene yog copolymerized nrog ethylene, ib qho tsis-crystallizable copolymer tau txais. Nws muaj peev xwm nthuav tawm cov yam ntxwv ntawm cov roj hmab, uas muaj kev laus ua haujlwm thiab cov tshuaj lom neeg zoo dua.

Rau qhov kub thiab kev vibration caisnthuav polypropylene yog dav siv. Lub melting point ntawm daim ntawv polypropylene tau hais los saum no, tab sis cov yam ntxwv no tsis yog tib qho uas koj yuav tsum xav txog ua ntej yuav khoom los ntawm cov khoom siv no. Koj yuav tsum paub tias polypropylene ua npuas ncauj yog ze heev hauv cov khoom rau polyethylene ua npuas ncauj. Tab sis nthuav polystyrene tuaj yeem hloov nrog cov khoom zoo nkauj extrusion ua los ntawm polypropylene ua npuas ncauj. Atactic polypropylene feem ntau yog siv los tsim putties, txoj kev nto, lub tsev adhesives, mastics thiab nplaum films. Lub Scope ntawm polypropylene nyob rau hauv Russia yog raws li nram no:

• 38% - thawv;
• 30% - xov;
• 18% - movies;
• 6 % - kav;
• 5% - polypropylene ntawv;
• 3% - lwm yam.

Melting point ntawm polypropylene kav

Lub ntsiab lus ntawm cov kav dej polypropylene yog ib qho ntawm cov yam ntxwv uas feem ntau nyiam rau cov neeg siv khoom niaj hnub no. Cov khoom no yuav pib mos ntawm 140 ° C, thaum melting ntawm 175 ° C. Qhov kawg parameter yog lub superheated chav kub. Muab tus lej no, polypropylene tuaj yeem siv rau txhua lub kav dej uas thauj dej ntawm qhov kub siab tshaj plaws.

Tab sis hauv qhov teeb meem no, txhua yam tsis yooj yim li. Plasticity yog ib qho ntxiv ntawm cov khoom siv. Thaum tawg, polypropylene muaj cov txheeb ze elongation, uas txawv ntawm 200 mus rau 800%. Qhov no qhia tau hais tias yog tias ib qho hnyav yog siv rau cov yeeb nkab, cov khoom yuav ncab mus rau hauv lub raj ntev, thiab tom qab ntawd tawg.

Raws li qhov xaus: qhov xwm ntawm polypropylene

Cov khoom ntawm polypropylene, cov yam ntxwv thiab qhov xwm txheej ntawm cov khoom no yuav tso cai rau koj nkag siab txog thaj chaw twg nws yog qhov zoo tshaj plaws los siv nws. Isotactic propylene yog suav tias yog qhov nrov tshaj plaws hauv kev tsim khoom niaj hnub no. Qhov no yog vim qhov peculiarities ntawm cov khoom siv no, qhov twg CH3 sab pawg muaj ib txoj hauj lwm tshwj xeeb, nyob txawv txav ntawm cov saw tseem ceeb. Xws li ib tug kheej kheej tau txiav txim siab cov yam ntxwv tseem ceeb, ntawm lawv yuav tsum tau hais txog: lub peev xwm los tswj cov duab thaum raug kub, hardness thiab siab zog.