摘要
以桉木硫酸盐法制浆黑液为原料,经过4步改性反应即氧化、羟甲基化、磺化和接枝共聚,得到改性木质素高效减水剂(MLS)。通过对MLS的表面张力、电荷密度、表面吸附量和流动度等性能分析,研究高效改性木质素减水剂的减水作用机理。黑液经过4步改性反应,有效地引入了活性基团,制备出的MLS的表面活性和电荷密度得到了提高;MLS通过在水泥颗粒表面形成吸附层达到减水作用,当MLS的掺加量为0.5%时,在水泥颗粒表面吸附量达到最高,减水效果已接近高效减水剂的水平。
Modified lignin superplasticizer was made by the four step modified reactions that is oxidation,hydroxymethylation,sulfonation and graft copolymerization reaction,using the gum wood sulfate black pulp liquor as raw material.Characterizing the modified lignin superplasticizer by determining the surface tension,charge density,surface adsorption and fluidity etc.then study the mechanism of the modified lignin superplasticizer.While active groups was effectively introduced into raw material after reactions,the surface activity and charge density of modified lignin superplasticizer were improved.Modified lignin superplasticizer act the function of decreasing water by forming adsorbed layers on the cement surface.As the adding amount of modified lignin superplasticizer was 0.5%,the adsorption quantity can reach the highest level,then the decreasing water effect reached the level of superplasticizer.
出处
《应用化工》
CAS
CSCD
2013年第8期1370-1373,共4页
Applied Chemical Industry
基金
国家自然科学基金(31100430)
江苏省制浆造纸科学与技术重点实验室开放基金(201306)
青岛市科技发展计划[12-1-4-3-(28)-jch]
关键词
木质素
减水剂
性能
作用机理
lignin
superplasticizer
characteristic
action mechanism
