Txoj kev tsim khoom
Txoj Kev 1: Hydrolysis method
Covacrylamidetau los ntawm txoj kev hydrolysis muaj kev faib tsis tu ncua ntawm acrylamide chains ntawm macromolecular chains.Qhov feem pua ntawm molaracrylamidechains ntawm macromolecular chains yog qib ntawm hydrolysis.
Piv nrog rau txoj kev copolymerization, cov dej-soluble anti-dandruff factor (HD) ntawm cov khoom npaj los ntawm txoj kev hydrolysis dav dav tsis siab, tsawg dua 30%.Raws li kev xav, cov khoom lag luam nrog HD ntau dua 70% yuav tsum tau npaj los ntawm txoj kev copolymerization, uas muaj qee yam yuav tsum tau ua ntawm hydrolysis kub thiab cov xwm txheej, thiab nws muaj feem cuam tshuam rau macromolecular degradation thaum lub sij hawm hydrolysis txheej txheem.
Txoj Kev 2: Polymerization ntawm aqueous tov
Aqueous tov polymerization polymerization nyob rau hauv uas cov tshuaj tiv thaiv monomer thiab pib yog yaj nyob rau hauv dej.Cov qauv no yog qhov yooj yim, tsis tshua muaj kuab paug ib puag ncig, siab yield ntawm polymer, yooj yim kom tau txais cov txheeb ze molecular hnyav polymer, yog thawj txoj kev siv nyob rau hauv kev lag luam ntawm polyacrylamide, thiab tau ua lub ntsiab txoj kev ntawm industrial ntau lawm ntawm polyacrylamide.Lub polymerization ntawm aqueous tov tau kawm tob.
Txoj Kev 3: Rov qab emulsion polymerization
Rov qab-theem colloidal dispersion system yuav tsum tau npaj ua ntej rov qab-theem emulsion polymerization thiab thim rov qab-theem ncua kev kawm ntawv polymerization, uas yog, dej / roj (W / 0) heterogeneous dispersion system yog tsim nyob rau hauv cov roj theem ntawm monomer aqueous tov los ntawm stirring dispersion. los yog emulsifier, thiab tom qab ntawd tus thawj coj tau ntxiv rau lub hauv paus dawb polymerization.
Feem ntau, cov roj soluble pib siv nyob rau hauv thim rov qab-theem emulsion polymerization, feem ntau anionic dawb radical pib thiab tsis-ionic dawb radical pib, thaum thim rov qab-theem ncua kev kawm ntawv polymerization siv cov dej soluble pib, xws li persulfate.Muaj ob qhov kev xav ntawm nucleation mechanism ntawm AM / AA thim rov qab emulsion polymerization: micellar nucleation thiab monomer droplet nucleation.Lub kinetics yog qhov txawv ntawm qhov zoo ntawm emulsion polymerization.
Txoj Kev 4: Rov qab ncua kev ncua polymerization
Reversed-phase suspension polymerization yog ib txoj hauv kev zoo tshaj plaws rau kev tsim cov dej-soluble polymers tsim nyob rau hauv 10 xyoo tsis ntev los no.Di-monie kawm AM reversed-theem ncua kev kawm ntawv polymerization siv conductivity, NMR thiab electron microscopy nyob rau hauv 1982.
Txoj Kev 5: Lwm txoj hauv kev polymerization
Ntxiv rau cov txheej txheem saum toj no, homopolymer thiab copolymer ntawm acrylamide thiab nws cov derivatives tuaj yeem hloov kho los ntawm Mannich cov tshuaj tiv thaiv thiab grafting copolymerization.Kev taw qhia ntawm amines rau hauv polyacrylamide thaum Mannich cov tshuaj tiv thaiv yog ib txoj hauv kev tseem ceeb kom tau txais cationic polyelectrografting ntawm polyacrylamide.Cov amines nquag siv yog dimethylamine, diethylamine, diethanolamine thiab lwm yam.
AM / AA feem ntau grafted nrog cov hmoov txhuv nplej siab los npaj cov resins uas absorbent heev, los yog nrog lwm cov macromolecular monomers graft AM / AA rau hauv tej daim nyias nyias.High molecular hnyav cationic polyacrylamide (CPAM) yog dav siv nyob rau hauv cov roj ntau lawm, tab sis HPAM muaj tsis zoo ntsev kam rau ua.
Post lub sij hawm: Mar-09-2023