CAJ | 학술논문

以玉米淀粉为原料,N,N-二甲基甲酰胺（DMF）为分散剂,氨基磺酸为磺化剂,合成淀粉磺酸酯减水剂。采用IR,Ds和SEM来表征减水剂分子结构,并对其用作水泥减水剂进行性能测试。主要讨论了淀粉,分散剂和磺化剂的配比、反应温度、反应时间等因素对磺化反应的影响。得到最佳工艺参数为：糊精∶DMF∶氨基磺酸质量比为1∶2∶0.6,反应温度95℃,反应时间2 h。结果表明,淀粉基减水剂的分子中有羟基和磺酸基两种阴离子作用基团,磺酸基取代度为0.37,取代效果非常好。而且当减水剂掺量为水泥量的0.8%时,减水剂的减水率可达34.6%,符合减水剂的国家标准。
이옥미정분위원료,N,N-이갑기갑선알（DMF）위분산제,안기광산위광화제,합성정분광산지감수제。채용IR,Ds화SEM래표정감수제분자결구,병대기용작수니감수제진행성능측시。주요토론료정분,분산제화광화제적배비、반응온도、반응시간등인소대광화반응적영향。득도최가공예삼수위：호정∶DMF∶안기광산질량비위1∶2∶0.6,반응온도95℃,반응시간2 h。결과표명,정분기감수제적분자중유간기화광산기량충음리자작용기단,광산기취대도위0.37,취대효과비상호。이차당감수제참량위수니량적0.8%시,감수제적감수솔가체34.6%,부합감수제적국가표준。
Taking comstarch as raw material,N,N-dimethylformamide as dispersing agent and sulfamic acid as sulfonating agent,starch sulfonate water-reducer is synthesized.The molecular structure of the water-reducer is demonstrate by means of IR,degree of substitution（DS） and SEM,and application performance of the water reducer on cement is tested.The influences of the starch proportioning,dispersing agent and sulfonating agent,reaction temperature and reaction time on sulfonation reaction are discussed.The optimum synthesis conditions are as follows∶ proportion of limit-dextrin,N,N-dimethylformamide and sulfamic acid is 1∶2∶0.6,the reaction temperature 95 ℃,reaction duration 2 h.Experimental results show that there are two anionic groups in the molecular structure of water reducer,which are hydroxy and sulphonic groups.The substitution degree of the sulphonic group is 0.37 that means good substitution effect.When the proportion of the water-reducer in cement is 0.8%,the water reducing ratio can reach 34.6%,which meets the national GB requirements.