Polymerization txoj kev ntawm nvp
Vinyl pyrrolidone monomer tsis muaj kev thov siv tus nqi ntawm kev lag luam. Nws tsuas yog siv tau hauv kev lag luam tom qab NVP yog polymerized lossis copolymerized rau lub polymer compound nrog ib tus qauv, muaj pes tsawg leeg sib xyaw.
NVP Monomer yog qhov yooj yim heev rau cov tshuaj tiv thaiv polymerizer. Cua Sov NVP Monomer rau saum toj 140 Qib lossis Ntxiv Qhov pib rau cov Monomer ntawm NVP yooj yim pib ua polyvinyl pyrrolidone (PVP). Txij li nvp yog qhov yooj yim heev rau undergo bul monomerization, VP monomer yuav tsum tau ntxiv nrog inhibitor nyob ntev thiab kev thauj mus los, thiab huv si ua ntej polymerization. NVP tuaj yeem yog polymerized nyob rau hauv ntau txoj kev, suav nrog cov polymerization, ntab polymerization thiab tov polymerization.
Txoj kev polymerization
NVP tuaj yeem ua kom sov rau 140℃lossis siab dua los pib monomer tso tawm los ntawm tshav kub. Tus txheej txheem polymerization yog ib qho txheej txheem exothermic. Cov cua sov tso tawm los ntawm cov tshuaj tiv thaiv tsis yooj yim rau diffuse, ua rau qhov kub ntawm cov tshuaj tiv thaiv loj, thiab molt pvp tau txais. Tom qab cov tshuaj tiv thaiv kab ke tau txias txias rau chav sov, pvp hmoov nrog kev hygroscopicity muaj zog tuaj yeem tau los ntawm kev tsoo.
Cov polymer tau txais los ntawm cov tshuaj polymerization muaj qhov tsis zoo ntawm K tus nqi ntawm cov laj thawj qis, cov tshuaj tiv thaiv zoo, teeb meem hauv polymer dispersion thiab lub zos overheating. Nws tsis tuaj yeem ua tau raws li qhov yuav tsum tau ua lag luam khoom lag luam thiab tsis muaj kev siv tus nqi hauv kev lag luam ntau lawm.
Kev Ncua Ntawv Polymerization
Kev Ncua Ntawv Polymerization yog tus polymerization nyob rau hauv uas monomers raug tshem tawm hauv dej hauv daim ntawv ntawm cov tee me me. Cov pib yog yaj nyob rau hauv cov monomers, thiab ib qho droplet me me yog sib npaug rau ib chav ntawm cov polymerization. Txhawm rau tiv thaiv cov lus los ntawm kev sib txuas los ntawm ib leeg, ib qho kev tawm tsam yuav tsum tau ntxiv rau lub kaw lus kom cov yeeb yaj kiab tiv thaiv tuaj yeem tsim nyob rau saum npoo ntawm cov lus. Yog li, kev ncua qib polymerization yog tsim ntawm plaub ntu pib: Monomer, tus pib thiab Dispersant.
Gaf lub tuam txhab ib zaug tau tshaj tawm cov txheej txheem ncua kev kawm ntawm nvp, uas siv cov dej tsis sib xws Kev Ncua Ntawv Polymerization yog qhov zoo tshaj plaws txoj kev npaj rau kev npaj PVP, thiab tuaj yeem npaj PVP nrog lub phaus molecular heev, txog 670,000.
Lub hauv paus ntsiab lus ntawm kev ywj pheej radical polymerization
Vinyl pyrrolidone muaj cov khoom muaj kev daws teeb meem zoo. Ntxiv rau kev ua soluble hauv dej, nws kuj yog soluble hauv ntau cov ethanicol, isoproform, isoproform, uas muab ntau dua ntawm NVP polymerization kuab tshuaj. Feem ntau, peb tsis siv dej, toluene thiab lwm yam kuab tshuaj, tab sis ethanol yog nquag mus saw hloov kev tawm tsam, thiab benzene tus neeg sawv cev feem ntau lom. Xav txog ntau yam, dej yog qhov pheej yig thiab nyab xeeb cov kuab tshuaj, yog li peb feem ntau siv dej ua ib qho hnyav.