Polycarboxylate superplasticizer yog dab tsi? Dab tsi yog kev siv ntawm polycarboxylate superplasticizer?

Polycarboxylate superplasticizer yog dab tsi? Dab tsi yog kev siv ntawm polycarboxylate superplasticizer?

Nyob rau hauv ntau qhov kev ua vaj tse, cov tsoos ua haujlwm zoo xws li naphthalene series tau nce zuj zus tuaj yeem ua tsis tau raws li cov kev xav tau ntawm cov haujlwm vim qhov kev txwv ntawm kev ua haujlwm. Lub cim tshiab ntawm cov dej reducer tau nyiam ntau yam hauv tsev thiab txawv teb chaws, thiab nws yog polycarboxylate ether-based high-performance water reducer. Polycarboxylate superplasticizer yog dab tsi? Dab tsi yog kev siv ntawm polycarboxylate superplasticizer?

Polycarboxylate superplasticizer yog ib qho kev ua tau zoo superplasticizer thiab cement dispersant, uas yog siv hauv cov cement pob zeb. Dav siv nyob rau hauv txoj kev loj, txuas hniav, dams, tunnels, high-sawv vaj tse thiab lwm yam dej num. Cov khoom yog ntsuab thiab ib puag ncig tus phooj ywg, tsis muaj hluav taws kub thiab tsis tawg, thiab tuaj yeem thauj mus los ntawm tsheb ciav hlau thiab tsheb. Raws li cov saw hlau sib txawv, cov khoom lag luam polycarboxylate superplasticizer tuaj yeem muab faib ua ob pawg: ib qho yog raws li acrylic acid lossis methacrylic acid ua cov saw tseem ceeb, grafted nrog polyethers ntawm cov saw sib txawv. Lwm qhov yog polyether nrog sib txawv sab saw lengths branched nrog maleic anhydride raws li lub ntsiab saw. Nyob rau hauv no lub hauv paus, ib tug series ntawm high-kev ua tau zoo dej reducer khoom nrog txawv cov yam ntxwv yog muab los. Ua ntej cov tsos ntawm polycarboxylic acid admixtures, muaj lignosulfonate admixtures, naphthalene sulfonate formaldehyde condensates, melamine formaldehyde condensates, sulfamate formaldehyde condensates, thiab lwm yam Nyob rau hauv thaum ntxov 1980s, Nyiv coj tus thawj coj nyob rau hauv kev vam meej superplasticizer. Cov tiam tshiab ntawm polycarboxylate superplasticizer kov yeej qee qhov tsis zoo ntawm cov tsoos superplasticizers, thiab muaj qhov zoo ntawm cov khoom siv tsawg dua, zoo slump tuav, qis pob zeb shrinkage, muaj zog molecular qauv adjustability, muaj peev xwm ua tau zoo, thiab muaj peev xwm ntau lawm, thiab lwm yam zoo, cov txheej txheem ua tau zoo. tsis siv formaldehyde thiab lwm yam zoo.

Qhov sib txawv ntawm polycarboxylate-raws li dej-reducers thiab naphthalene-raws li dej-reducers nyob rau hauv: ua ntej, ntau haiv neeg thiab adjustability ntawm cov qauv molecular; . Los ntawm qhov kev pom ntawm lub tswv yim ntawm kev ua, cov qauv molecular ntawm polycarboxylate superplasticizer yog comb-puab, thiab muaj zog polar anion "tsheb thauj mus los" pawg ntawm cov saw tseem ceeb yog adsorbed ntawm cov cement hais, thiab sab nraud txuas ntxiv zuag zoo li cov qauv. tau txais kev txhawb los ntawm ntau ceg saw. Cov hniav zoo li tus qauv muab cov txiaj ntsig spatial txaus rau kev cuam tshuam ntxiv ntawm cov cement hais. Piv nrog rau cov hluav taws xob repulsion ntawm naphthalene-raws li superplasticizer bilayer, steric hindrance khaws cov dispersion rau lub sij hawm ntev. Kev hloov cov comb-zoo li tus qauv ntawm polycarboxylate superplasticizer, thiab tsim nyog hloov qhov ceev thiab ntev ntawm sab chains, tuaj yeem tau txais cov dej-txo thiab high-early-strength superplasticizers haum rau prefabricated Cheebtsam. Polycarboxylate superplasticizer tuaj yeem kho thiab hloov cov qauv molecular raws li kev xav tau kom ua tiav lub hom phiaj ntawm kev hloov pauv kev ua haujlwm, tsis yog kev hloov pauv yooj yim.