Cov khoom siv yas sib txawv cog lus los ua cov kav dej, muaj kev ua haujlwm vim li cas qhov txawv?
Yas, raws li ib tug derivative ntawm petrochemical kev lag luam, tau dhau los ua ib qho kev hloov rau ntau cov ntaub ntawv tsoos nrog zoo heev kev ua tau zoo. Niaj hnub no, muaj ntau yam ntawm cov kav dej yas ntawm kev ua lag luam rau ntau lub hom phiaj, nrog rau cov khoom sib txawv. Ntau tus neeg yuav tsis paub qhov txawv ntawm lawv.
Qhov tseeb, muaj ntau yam khoom siv yas. Yog li dab tsi ntawm cov yas feem ntau siv los ua cov kav dej? Yifan Youjia, rau koj los qhia hauv kev nthuav dav.
I. Polypropylene
Polypropylene (PP) yog ib qho thermoplastic (heat-fusible) polymerized los ntawm propylene. Nws yog cov yas tsawg kawg nkaus. Nws feem ntau yog cov khoom tsis muaj xim tsis muaj xim, tsis muaj ntxhiab thiab tsis muaj tshuaj lom.
Vim yog qhov brittleness ntawm polypropylene ntawm qhov kub thiab txias, txhawm rau txhim kho qhov tsis txaus, propylene feem ntau yog copolymerized nrog me me ntawm ethylene molecules, yog li polypropylene muab faib ua homopolymer polypropylene thiab copolymer polypropylene.
Polypropylene muaj kev ua haujlwm siab zoo, thiab yooj yim heev rau kub yaj vuam tom qab ua rau hauv cov yeeb nkab. Piv nrog PE, nws tuaj yeem tiv taus qhov kub thiab txias, yog li nws tau siv dav hauv cov kav dej hauv tsev. Hauv cov txheej txheem ntawm kev siv polypropylene ua cov khoom siv raw khoom, nws tau ntsib cov txheej txheem kev txhim kho hauv qab no:
Pp-h yog homopolymer polypropylene, feem ntau hu ua hom ⅰ polypropylene. Ua tiav ntawm propylene polymerization, cuam tshuam tsis zoo, qhov kub thiab txias kuj yog qhov zoo. Lub raj xa dej feem ntau yog siv rau cov kav dej tshuaj lom neeg lossis lwm lub hom phiaj engineering.
Pp-b yog thaiv copolymer polypropylene, feem ntau hu ua hom ⅱ polypropylene. Pp-b muaj cov ntsiab lus ethylene siab, uas zoo heev txhim kho nws qhov kub thiab txias tsis kam, tab sis poob nws qhov kub tsis kam. Yog li cov kav dej ua los ntawm nws feem ntau haum rau cov dej txias.
Pp-r rau random copolymerization polypropylene, feem ntau hu ua Ⅲ hom polypropylene, los ntawm ib tug me me ntawm ethylene monomers thiab polymerization ntawm propylene nrog trackless copolymerization txoj kev, nws sib npaug qhov zoo ntawm kev ua tau zoo ntawm PP, PP - B - H, tsis tau tsuas yog nqus tau a qee qhov kub thiab txias, thiab txhim kho qhov cuam tshuam ntawm qhov kub thiab txias, raws li qhov zoo tshaj plaws, cov khoom siv yeeb nkab tuaj yeem siv dav hauv cov dej txias thiab kub da dej. Niaj hnub no, PPR tau nyob hauv tsev los txhim kho thaj chaw mus rau qhov zoo ntawm kev ua lag luam ntawm cov kav dej, qhov no tsis tuaj yeem tawm qhov ruaj khov thiab txhim khu kev qha thiab yooj yim installation, tseem muaj tus nqi ntawm cov neeg nyob ze ntawm qhov tseeb.
Pp-rct tseem hu ua kub resistant -crystalline PPR, yog hloov PPR khoom, feem ntau hu ua hom ⅳ polypropylene. Vim tias cov siv lead ua hexagonal siv los hloov cov monoclinic siv lead ua ntawm PP-R, pp-RCT muaj cov khoom siv lub cev ntawm PP-R, thiab tau txhim kho hauv kev ua haujlwm kub, siab tsis kam, toughness thiab lwm yam. Tam sim no, PP-RCT feem ntau yog siv rau hauv cov cua kub cua sov.PB polybutene
Poly butene (PB) los ntawm polymerization ntawm butene mus rau hauv ib lub thermoplastic yas (kub yaj), nws tsis muaj tshuaj lom tsis muaj ntxhiab tsw, txias tsis kam thiab kub tsis kam yog zoo heev, hu ua "kub hauv yas".
PB raj feem ntau yog mis nyuj dawb.
Tom qab tau ua rau hauv cov yeeb nkab, PB yeeb nkab muaj cov compressive zoo heev, tab sis tsis zoo cuam tshuam thiab yooj yim tawg. Tom qab kub melting, PB yog thicker, thiab lub txias thiab hardening lub sij hawm yog ntev dua, yog li cov kev tsim kho nyuaj yog kuj siab. Raws li cov kav dej cua sov, vim qhov kev ua haujlwm zoo thermal rwb thaiv tsev, piv nrog cov khoom siv hluav taws xob zoo dua ntawm PE, tsis haum rau hauv pem teb cua sov yeeb nkab.
