Polypropylene melting point: tus yam ntxwv thiab cov khoom

Polypropylene yog ib tug thermoplastic polymer ntawm propene. Qhov no yog npaj raws li lub tshuab ntawm polymerization ntawm propylene siv catalysts ntawm hlau. Yog xav tau cov khoom no tsis zoo sib xws rau cov neeg uas lub ua kev kub ceev polyethylene.

Nyob ntawm seb dab tsi zoo ntawm catalyst siv, yog tau mus nrhiav tau txhua yam ntawm polymer los yog mixtures thereof. Lub melting point ntawm polypropylene - yog ib tug ntawm cov tseem ceeb cov yam ntxwv ntawm cov khoom no. Nws muaj daim ntawv ntawm cov dawb hmoov los yog granules, tej ceev uas yog hloov mus rau 0, 5 g / cm³. Lub piav cov ntaub ntawv uas tej zaum yuav dawb lias, los yog uncolored stabilized.

Specifications: molecular qauv

Rau polypropylene lub molecular qauv yog muab faib ua ob peb hom, ntawm lawv:

• isotactic;
• ataxic;
• syndiotactic.

Stereoisomers khoom txawv nyob rau hauv lub cev, neeg kho tshuab thiab tshuaj cov yam ntxwv. Piv txwv li, atactic polypropylene muaj rau hauv daim roj hmab zoo li cov ntaub ntawv uas, uas yog cov yam ntxwv ntawm siab fluidity. Lub melting point ntawm polypropylene rau extrusion nyob rau hauv cov ntaub ntawv no yog hais txog 80 ° C, thaum lub sij hawm ceev yuav ncav cuag ib theem ntawm 850 kg / m³.

Lub diethyl ether cov khoom yaj zoo heev. By zog isotactic polypropylene txawv los ntawm saum toj no-piav thiab muaj ib tug high modulus ntawm elasticity, nws ceev nce mus txog 910 kg / m³, thaum lub melting kub yog hom twg los ntawm 165 mus 170 ° C. Nyob rau hauv no hom ntawm polypropylene yog yus muaj los ntawm yav tom ntej kuj yuav tshuaj.

Lub cev thiab txhua yam khoom

Niaj hnub no nws yog tshwm sim heev rau siv polypropylene. Lub melting point ntawm no cov ntaub ntawv uas yog txawv los ntawm tus neeg hom. Heev feem ntau, nws yog muab piv rau polyethylene, tab sis polypropylene tsis yog raws li kev kub ceev, nws yog 0,91 g / cm³. Ntxiv mus, Polypropylene yog nyuab me ntsis thiab resistant mus puas, thiab yog resistant rau kub.

Theem nws pib softening nyob ib ncig ntawm 140 ° C, whereas lub melting kub nce mus txog 175 ° C. Corrosion cracking ntawm cov ntaub ntawv uas yog tsis raug. Nws yog ruaj khov rau cov pa thiab lub teeb, tiam sis, qhov no rhiab heev yog txo yog tias cov khoom xyaw stabilizers yuav muab ntxiv nyob rau hauv qhov siv thiab ua polypropylene.

Nyob rau hauv cheeb tsam sib txawv ntawm qhov kev lag luam siv ntau hom ntawm polypropylene niaj hnub no. Lub melting point ntawm no cov ntaub ntawv uas nthuav cheeb tsam ntawm daim ntawv thov. Elongation ntawm so nyob rau hauv ib tug feem pua yuav raug varied ntawm 200 rau 800%. Paib zog nyob rau hauv nro sib npaug zos rau cov kev txwv ntawm 250 mus rau 350 kgf / cm². Impact zog nrog notch yog hom twg los ntawm 33 mus rau 80 kgf · cm / cm², whereas lub Brinell hardness yog nruab nrab ntawm 6 thiab 6.5 kgf / mm².

Lub ntsiab tshuaj zog

Yog hais tias koj npaj yuav yuav ib co khoom los ntawm polypropylene, lub melting point ntawm cov khoom, koj yuav tsum tau paub. Hais txog nws tham nyob rau hauv tsab xov xwm. Los ntawm nws koj muaj peev xwm kawm tau thiab lwm yam tshuaj muaj zog. Piv txwv li, cov ntaub ntawv uas yog sib ruaj khov nyob rau hauv cov organic solvents thiab tsuas yog me ntsis swells nws. Yog hais tias qhov kub thiab txias ntawm lub nce mus 100 ° C, tus uas muaj ntxhiab hydrocarbon khoom yaj. Nyob rau hauv cov ntaub ntawv no nws yog ib lo lus nug ntawm toluene thiab benzene.

Rau cov yog vim li cas hais tias cov polypropylene muaj tertiary carbon atoms, nws yog resistant rau oxygen nyob rau hauv tus ntawm ultraviolet tawg thiab tsa kub. Qhov no ua rau ib tug ib txwm rau cov laus li muab piv nrog polyethylene. Nyob rau hauv tus ntawm txhoj puab heev kev kawm polypropylene tsis yog raws li ib qho nyuaj raws li polyethylene, yog raug rau ntes. Nws yog tau yauv mus ua kev ntsuam xyuas rau ntes txawm nyob rau hauv kev nyuaj siab.

Lub melting point ntawm polypropylene kav

Heev feem ntau, cov niaj hnub neeg txaus siab polypropylene melting kub. Kav yog kev txhawj xeeb, Yog hais tias koj npaj mus nqa tawm kev txhim kho ntawm lub cua sov system. Thaum raug kub ntawm 140 ° C, cov khoom yuav muag thiab yog li nws loses nws zoo lawm. Whereas yog hais tias tus kub yog tsa mus rau ib theem ntawm 170 ° C, tus melting kauj ruam no tshwm sim. Nyob rau tib lub sij hawm nws yuav tsum los ua ib tug qauv thiab poob lub peev xwm los khaws nws zoo lawm thiab specifications.

Cua sov tshuab nyob rau hauv xws li ib tug kub theem yog tsis xam, yog li cov dej tsis zoo system nyob rau hauv polypropylene hlab yog haum. Feem ntau, manufacturers hais tias lub siab tshaj plaws tau kub ntawm polypropylene kav yog 95 ° C. Cov khoom yuav mas ib tug ntau dua kub theem, tab sis luv luv. Yog hais tias lub caij nyoog siv cov yeeb nkab ntawm ib tug kub siab tshaj 100 ° C, lawv muab kev pab lub neej yuav txo tau.

Thaum lub kub dauv polypropylene yuav sib txawv nyob rau hauv loj. Thaum rhuab, nws yuav nthuav thiab nyob rau cua txias - ntsws. Nyob rau hauv tus ntawm kub kav yuav pib sag ntawm lub nabkaus thiab nyob rau hauv tus txheej txheej, koj yuav pom o.

Nuances siv polypropylene hlab

Qhov kev tshawb tej zaum kuj yuav siv nyob rau hauv cov khoom ntawm polypropylene. Lub melting point ntawm xws kav tej zaum yuav txawv. Qhov no yuav tsum raug xam tias yog yog hais tias tus khoom ua ntej koj PN20 hom. Nyob rau hauv cov ntaub ntawv no nws yog ib tug yeeb nkab, cov ua hauj lwm kub uas yog 60 ° C. Tab sis thaum nws los txog rau PN25 khoom, nws qhia tau hais tias nws yuav tsum tau los mus tiv kub txog li 95 ° C.

xaus

Nrog zoo yog muaj kev ruaj ntseg hais tias tso cai foob polypropylene pa luam yeeb nyob ze ntawm lub mines. Lub melting point ntawm lub polypropylene, txawm li cas los, tsis tau pom tias tus yeeb nkab yuav tsum tsis txhob muaj kev tiv thaiv. Kws txawj pom zoo kom purchase tam khoom, uas yog tsawg raug rau deformation sov siab. Yog li ntawd, cov kav dej yuav tsum tau insulated thiab kev tiv thaiv ntxiv muaj ib puab txheej ntawm txhuas los yog fiberglass. Qhov no tiv thaiv cov yeeb nkab los ntawm cov expansion thiab cas sim haum lawv pab lub neej.