关键词: 马来酸酐, 蔗糖, 减水剂

Abstract: 1-(chloromethyl)-4-ethenyl-benzen-maleic anhydride grafted sucrose superplasticizer (SP) was prepared from sucrose and 1-(chloromethyl)-4-ethenyl-benzen-maleic anhydride copolymer (ClSMA) through heterogeneous polymerization with benzoyl peroxide (BPO) as initiator,styrene and maleic anhydride (MAH) as monomers. The molecular structure was characterized by FI-IR and ¹H-NMR. Effects of the reaction temperature,reaction time and degree of catalyzer on the substitution reaction were investigated with the initial fluidity as measurement index. The result shows that the optimal condition of substitution reaction includes that the amount of catalyst is 10% according to the mass of sucrose and 1-(chloromethyl)-4-ethenyl-benzen-maleic anhydride copolymer,the reaction temperature is 45℃ and reaction time is 2h. SP prepared under optimal condition has good plasticizing property,the initial fluidity of cement paste reaches 320mm,and the water-reducing ratio is 27.9%.

Key words: maleic anhydride, sucrose, superplasticizer