摘要
以酸析木质素为原料,通过接枝、磺化和缩合制得接枝磺化酸析木质素GSAL,研究了它与木质素磺酸盐和消泡剂的配伍性能。结果表明:GSAL分别与木质素磺酸盐及其改性产品复配,可得到减水剂GSAL1和GSAL2。当水灰比为0.29、掺量w(GSAL1)=0.6%时,水泥净浆流动度达243mm;掺量w(GSAL2)=0.8%时,水泥净浆初凝时间延长110min,终凝时间延长约7h。掺量w(GSAL1)=0.8%时,水泥净浆减水率为21.4%,砂浆3d和7d的抗压强度比分别为163%和143%,其对水泥的减水增强作用超过了萘系高效减水剂FDN。GSAL与消泡剂的复配产品起泡性降低,水泥净浆流动度、新拌砂浆密度和砂浆抗压强度比均增大,GSAL与磷酸三丁酯配伍后的综合性能最佳。
A superplasticizer GSAL was synthesized from acid precipitated lignin through graft, sulfonation and polycondensation. The compatibility of GSAL with lignosulfonate and defoaming agents was studied. Two superplasticizers （GSAL1 and GSAL2 ） were prepared by combining GSAL with lignosulfonate and its modified product respectively. When w （ GSALI ） = 0. 6% , the fluidity of the cement paste is 243 mm under the water to cement ratio of 0. 29. When w （GSAL2） = 0. 8% , the initial setting time and final setting time of cement paste are retarded for 110 min and 7 h respectively. When w （GSAL1） = 0. 8% ,the water reducing ratio of the cement paste is 21.4% , and the 3-day and 7-day compressive strength ratios of mortar are 163% and 143% respectively, indicating that its water reducing ability and strength improving effect are better than those of naphthalene sulfonate formaldehyde condensate （FDN）. When defoaming reagents are added to GSAL, its foamability declines ; the fluidity of the cement paste, the density of fresh mortar and compressive strength ratio of mortar all become larger. The over-all application performances of the combined product by mixing GSAL and tributyl phosphate are the best.
出处
《精细化工》
EI
CAS
CSCD
北大核心
2008年第10期1016-1020,共5页
Fine Chemicals
基金
国家自然科学基金项目(20676040)
广东省自然科学基金重点项目(05103536)
广东省科技计划项目(2006A37002001
2006B14401006)~~
关键词
木质素
接枝磺化
高效减水剂
配伍
建筑用化学品
lignin
graft-sulfonation
superplasticizer
compatibility
building chemicals
