I. Polypropylene
Polypropylene (PP) yog ib hom thermoplastic yas (kub yaj) tsim los ntawm polymerization ntawm propylene. Nws yog cov yas tsawg kawg nkaus, feem ntau yog cov xim tsis muaj xim, tsis muaj ntxhiab thiab tsis muaj tshuaj lom.
Vim tias qhov kub tsis txias ntawm polypropylene, txhawm rau txhim kho qhov tsis zoo no, propylene feem ntau yog copolymerized nrog me me ntawm ethylene molecules, yog li polypropylene muab faib ua homopolymerized polypropylene thiab copolymerized 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 dav siv hauv tsev kho kom zoo nkauj cov kav dej. Polypropylene tau ntsib cov txheej txheem kev txhim kho hauv qab no thaum nws siv los ua cov khoom siv raw khoom:
Pp-h yog homopolymer polypropylene, feem ntau hu ua hom I polypropylene. Ua tiav ntawm propylene polymerization, kev cuam tshuam tsis zoo yog qhov 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 feem ntau ntawm kev ua lag luam rau cov kav dej hauv thaj chaw ntawm kev kho kom zoo nkauj hauv tsev, uas yog sib cais los ntawm kev ruaj ntseg, kev ntseeg siab thiab kev teeb tsa yooj yim, thiab ntawm chav kawm tus nqi kuj nyob ze rau cov neeg.
Pp-rct tseem hu ua high-temperature -crystalline PPR, yog cov khoom siv PPR hloov, feem ntau hu ua hom ⅳ polypropylene. Vim lub hexagonal siv lead ua daim ntawv hloov cov monoclinic siv lead ua daim ntawv ntawm PP-R, PP-RCT muaj cov khoom siv lub cev ntawm PP-R, thiab cov cua sov, siab, toughness thiab lwm yam tuaj yeem txhim kho. Tam sim no, PP-RCT feem ntau yog siv rau hauv cov cua kub cua sov.
PB polybutene
Polybutene (PB) los ntawm butene polymerization rau hauv cov thermoplastic (kub yaj), nws tsis muaj tshuaj lom, tsis muaj ntxhiab, txias thiab kub tsis kam yog qhov zoo heev, hu ua "kub hauv yas".
PB raj feem ntau yog mis nyuj dawb.
Tom qab cov yeeb nkab tau tsim, lub siab tsis kam ntawm PB yeeb nkab yog qhov zoo heev, tab sis qhov cuam tshuam tsis zoo yog qhov tsis zoo thiab yooj yim tawg. PB yog qhov khov kho tom qab kub yaj, thiab lub sijhawm txias txias yog ntev dua, thiab kev tsim kho nyuaj yog qhov siab. Raws li cov kav dej cua sov, vim qhov kev ua tau zoo ntawm cov rwb thaiv tsev, piv nrog cov khoom siv hluav taws xob zoo dua PE, tsis haum rau cov kav dej cua sov.