Synthesis ntawm polycarboxylic acid superplasticizer
Aug 21, 2024
Synthesis ntawm polycarboxylic acid superplasticizer
Abstract ntawm tsab xov xwm
Lub hom phiaj tseem ceeb ntawm polycarboxylate superplasticizer (PCE) yog dab tsi?
PCE yog siv los txhim kho kev ua haujlwm ntawm pob zeb, txo cov dej-rau-cement piv, thiab txhim kho lub zog thiab kav ntev ntawm cov pob zeb.
Cov ntaub ntawv dab tsi feem ntau siv hauv kev sib txuas ntawm PCE?
Lub synthesis ntawm PCE feem ntau koom nrog cov ntaub ntawv xws li polyethylene glycol (PEG), methacrylic acid (MAA), thiab acrylic acid (AA).
Lub luag haujlwm dab tsi ua cov thawj coj thiab cov inhibitors ua si hauv kev sib txuas ntawm PCE?
Initiators, xws li ammonium persulfate thiab potassium persulfate, pib cov tshuaj tiv thaiv polymerization, thaum inhibitors zoo li hydroquinone thiab nitrobenzene tiv thaiv ntxov ntxov gelation los yog spontaneous polymerization thaum lub sij hawm tus txheej txheem.
Kev siv thev naus laus zis ua ntej cuam tshuam li cas rau kev tsim PCE?
Kev nce qib thev naus laus zis, suav nrog kev siv cov kua ionic thiab microwave-pab synthesis, txhim khu kev ua haujlwm ntawm PCE synthesis, txhim kho cov khoom ua tau zoo, thiab txo cov nqi tsim khoom.
- Hauv kev tsim kho engineering, kev ua haujlwm ntawm cov pob zeb ncaj qha cuam tshuam rau qhov zoo thiab kev ua neej nyob ntawm tag nrho cov qauv. Nrog rau txoj kev loj hlob sai ntawm kev tsim kho kev lag luam, cov kev ua tau zoo ntawm cov pob zeb ua tau nce ntxiv. Raws li ib qho tseem ceeb ntawm cov khoom siv ntxiv, polycarboxylate superplasticizer (PCE) tuaj yeem txhim kho kev ua haujlwm ntawm cov pob zeb, txo cov dej-rau-cement piv, thiab txhim kho lub zog thiab kav ntev. Yog li ntawd, kev tshawb fawb ntawm cov txheej txheem synthesis ntawm PCE yog qhov tseem ceeb rau kev txhim kho pob zeb zoo.
- Lub synthesis ntawm PCE feem ntau pib nrog cov tshuaj tiv thaiv esterification, ua raws li cov tshuaj tiv thaiv polymerization los tsim cov khoom kawg. Cov ntaub ntawv tseem ceeb siv hauv txoj kev sib txuas no suav nrog polyethylene glycol (PEG), methacrylic acid (MAA), thiab acrylic acid (AA). Polyethylene glycol, ib tug polyhydroxy compound, muab ib co ntawm cov polymer pab pawg neeg xav tau rau synthesizing polycarboxylates. Methacrylic acid, unsaturated acid nrog carbon-carbon ob daim ntawv cog lus, yog ib qho ntawm cov tseem ceeb active monomers rau synthesizing polycarboxylates. Acrylic acid yog ib qho kev ua haujlwm monomer uas tseem koom nrog cov tshuaj tiv thaiv polymerization.
- Cov tshuaj tiv thaiv ua nyob rau hauv cov tshuaj aqueous feem ntau yuav tsum tau pib thiab inhibitors. Initiators raug ntxiv los pib cov tshuaj tiv thaiv polymerization, feem ntau siv cov inorganic peroxides xws li ammonium persulfate thiab potassium persulfate, los yog organic azo tebchaw. Inhibitors yog siv los tiv thaiv ntxov ntxov gelation los yog spontaneous polymerization thaum lub sij hawm polymerization txheej txheem, thiab muaj peev xwm muaj xws li hydroquinone, nitrobenzene, thiab lwm yam.
- Thaum lub sij hawm synthesis ntawm PCE, qhov piv ntawm raw cov ntaub ntawv, cov tshuaj tiv thaiv kub, thiab cov tshuaj tiv thaiv lub sij hawm yog cov txheej txheem tsis ncaj qha cuam tshuam rau qhov kawg khoom qhov kev ua tau zoo. Tom qab kev sib txuas, cov khoom lag luam feem ntau dhau los ua tus cwj pwm, uas yuav suav nrog cov txheej txheem xws li Fourier-hloov infrared spectroscopy (FT-IR), nuclear magnetic resonance (NMR), gel permeation chromatography (GPC), thiab thermogravimetric tsom (TGA). Cov txheej txheem kev ua tus cwj pwm no pab txheeb xyuas cov khoom lag luam cov qauv tshuaj, molecular hnyav faib, thermal stability, thiab lwm yam khoom.
- PCE tau txais txiaj ntsig zoo vim tias, piv rau cov khoom siv dej ib txwm muaj xws li naphthalene-based superplasticizers, nws muaj cov dej txo qis dua, qhov poob qis tsawg, thiab kev txhim kho tseem ceeb. Tsis tas li ntawd, PCE yog ib puag ncig zoo dua li nws tsis muaj tshuaj lom xws li nitrites.
- Hauv kev tsim khoom lag luam, kev sib txuas ntawm PCE yuav tsum tau tswj cov tshuaj tiv thaiv ib puag ncig kom ntseeg tau cov txheej txheem kev ruaj ntseg thiab cov khoom siv tsis tu ncua. Txhawm rau ua kom tau raws li kev xav tau ntawm kev lag luam rau kev ua tau zoo ntawm cov khoom sib txawv, nws tseem yuav tsum tau kho cov txheej txheem synthesis, xws li hloov cov khoom siv raw thiab cov txheej txheem synthesis, los tsim ntau hom PCE.
- Raws li kev siv thev naus laus zis tsis tu ncua, cov txheej txheem synthesis rau PCE kuj tseem txhim kho thiab txhim kho. Piv txwv li, cov thev naus laus zis tshiab zoo li kev siv cov kua ionic li nruab nrab thiab microwave-pab synthesis tsis tsuas yog txhim kho synthesis efficiency tab sis kuj txhim kho cov khoom ua tau zoo thiab txo cov nqi tsim khoom.
- Lub synthesis ntawm PCE yog ib tug complex engineering txoj hauj lwm uas muaj cov hauv paus ntsiab lus ntawm cov tshuaj tiv thaiv, industrial chemistry, thiab cov ntaub ntawv science. Kev tshawb fawb tob rau hauv nws cov txheej txheem synthesis yog qhov tseem ceeb rau kev ua kom zoo dua ntawm PCE kev ua tau zoo thiab txhim kho qhov zoo ntawm kev tsim kho engineering.
