Iav yog lub ntsiab tivthaiv ntawm iav silica, nyob rau hauv lub iav kev lag luam, feem ntau tsis muaj xim tsis muaj pob tshab dawb iav hu ua iav. Cov hom iav yog qhov khoom loj tshaj plaws ntawm cov iav tsom iav qhauj, thiab tseem yog siv ntau yam khoom siv rau iav tob rau cov chaw lag luam.
Siv: ncaj qha siv dawb iav tsuas yog rau cov tsev qib qis, chaw ua haujlwm thiab vaj tse, thiab lwm yam.
Kev Ua Tau:
Lub teeb thiab cov cua kub ua haujlwm tsis zoo, yog tias tsis xyuam xim, qee zaum tsis quav ntsej nws thiab ua rau muaj teeb meem ntau heev. "Dawb iav ua kom muaj zog cua ntsawj, feem cuam tshuam yog kev txom nyem, yooj yim tawg.
PMMA yog polymethyl methacrylate, ib hom yas. Xyoo 1927, kws tshuaj chiv ntawm Rom Haas cov tuam txhab nyob hauv lub teb chaws Yelemees rhuav tshem acrylic ester ntawm ob daim iav daim hlau, thiab cov acrylic ester yog polymerized los ua ib daim nplaum lo nplaum nplaum, uas yuav siv tau ua ib qho kev ruaj ntseg iav kom tsis txhob tawg. Thaum lawv polymerized methyl methacrylate nyob rau hauv tib txoj kev, lawv tau txais ib daim iav organic iav nrog kev kaj thiab zoo khoom, thiab nws yog polymethyl methacrylate.
Nyob rau hauv xyoo 1931, lub tuam txhab Rom & Haas koom nrog hauv PMMA, thawj zaug siv nyob rau hauv qhov kev lag luam aircraft, hloov cov plhaub av celluloid, cov nplooj saum toj thiab cov xim.
Yog hais tias ntxiv ntau yam xim tus neeg sawv cev rau hauv cov iav organic, tau polymerize rau hauv cov xim iav dub; yog tias ntxiv cov neeg ua hauj lwm fluorescent (xws li cov zinc sulfide), yuav ua tau rau cov iav organic fluorescent fluid; yog tias ntxiv cov khoom pearl hmoov (xws li cov hmoov lead carbonate), ces npaj Pearl iav.
