Synthesis of Polycarboxylate Superplasticizer Based on Hydrophobic-Modified Polyoxyethylene Ether and Its Viscosity-Reducing Performance

Abstract

Abstract: Hydrophobic-modified polyoxyethylene ether macromonomers were prepared by alkaline ring opening reaction of butyl glycidyl ether at the ends of isoprenyl oxy poly (ethylene glycol) ether. Base on this, a series of hydrophobic-modified polycarboxylate superplasticizers were synthesized by the copolymerization of acrylic acid, maleic anhydride and hydrophobic-modified macromonomers. The effect of the adduct number (3, 5, 8) of butyl glycidyl ether on the dispersion and adsorption performance of modified polycarboxylate was studied.And the effect of modified polycarboxylate on the viscosity of cement pastes was investigated through cement mortar and concrete experiments. The results show the optimum adduct number is 3, the dispersion performance is not affected, and the adsorption performance increases by 21%. If the adduct number continues to grow, the dispersion performance gets worse while the adsorption performance is not improved markedly. The modified polycarboxylate reduces the viscosity of cement mortar by more than 30%, increases the flow velocity of cement mortar by 40%, shortens the V-funnel efflux time of cement mortar by 27% and the inverted slump tube efflux time of concrete by 34%, which unquestionably confirms that the hydrophobic-modified polycarboxylate can effectly reduce the viscosity of cement pastes.

Key words: butyl glycidyl ether, polycarboxylate, superplasticizer, hydrophobic-modification, cement mortar, working performance, viscosity

CLC Number:

TU528.042.2

LI Shentong, YANG Yong, ZHOU Dongliang, HU Cong, LIU Jinzhi, ZHANG Zhiyong. Synthesis of Polycarboxylate Superplasticizer Based on Hydrophobic-Modified Polyoxyethylene Ether and Its Viscosity-Reducing Performance[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(7): 2251-2257.

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