Dab tsi yog qhov sib txawv ntawm naphthalene tus tuav dej tawm thiab naphthalene

Dab tsi yog qhov sib txawv ntawm naphthalene tus tuav dej tawm thiab naphthalene

Qhob dej reducer yog ib qho ntawm feem ntau siv admixtures. Thaum ntxov li xyoo 1940, kev txhim kho thiab tshawb fawb txog kev ua haujlwm ntawm ntau hom ntoo, uas yog lub npe hu ua dej-txo cov kab mob thiab cov dej-txo cov neeg ua haujlwm, twb tau tsim txoj haujlwm tiav lawm. Hauv lub sijhawm xyoo 1960, naphthalene tus neeg txo cov dej yog tus sawv cev Qhov thib ob-tiam superplasticizer tawm. Xyoo 1980s, lub koob thib 3-theem siab ua superplasticizer, sawv cev los ntawm naphthalene superplasticizers, tau tshwm sim los ua qhov hloov chaw zoo tshaj plaws rau cov neeg tiam thib ob xws li naphthalene series. Kev ua tau zoo ntawm tus neeg sawv cev dej tau raug nkag siab ntau ntxiv, thiab muaj qhov zoo los ntawm kev txo qis hauv cov dej thiab cov txiaj ntsig kev ua haujlwm.

Zoo li naphthalene, cov dej ua kom txo qis thiab cov ntsev ua kom zoo dua qub tseem muaj cov teeb meem ntawm kev yoog raws ua cov cement, tab sis muab piv nrog naphthalene-based dej-txo cov neeg ua haujlwm, thaum lwm cov sib txawv ntawm cov sib txawv ntawm cov pob zeb ua kev yog cov qub, naphthalene-based superplasticizers Zoo tshaj qhov ntau npaum ntawm sulphate nws txawv heev, thiab qhov siab tshaj plaws qhov txawv yog 20-40%. Txawm li cas los xij, qhov zoo tshaj plaws ntawm cov superplasticizer yuav luag zoo li qub, vim tias ntsev muaj qhov siab ntawm superplasticizer. Qhov dej txo ntawm niam cov cawv ntau tshaj 40%, thiab dej txo txo ​​ntawm naphthalene series yog nruab nrab ntawm 15% -20%. Thiab muaj qhov pom tseeb zoo dua nyob rau hauv cov nyiaj ntawm doping. Piv nrog rau kev tiv thaiv ib puag ncig nyob rau hauv kev coj thiab kev siv, cov txheej txheem ua kom yooj yim yog yooj yim. Txawm li cas los xij, kev tsim hluav taws xob ntawm naphthalene noj lub zog thiab ua kom muaj kuab paug ib puag ncig, thiab cov txheej txheem tsim khoom yog qhov nyuaj.