摘要
通过自由基聚合制备了5种聚丙烯酸．甲基丙烯磺酸钠共聚物（PC-1～PC-5），并以梳状聚羧酸（Pc）和萘系（FDN）为对照，探讨了这5种共聚物对建筑石膏性能的影响。结果表明，PC-4[n（丙烯酸）：n（甲基丙烯磺酸钠）=6：1]的减水率最大，掺量为0．3％（以石膏质量计）时减水率达22％。当PC-4的掺量为0．3％时，石膏浆体流动性保持时间达到最长为60min；试块2h吸水率最低达到16％，比空白低11．5％；试块干抗折、抗压强度比空白组分别提高30％、31％；试块软化系数达到最大，为0．36，比空白高0．1。PC-4对建筑石膏具有优异的缓凝减水作用。
Five kinds of poly （ acrylic acid-co-sodium methallyl sulfonate ） （ PC - 1 - PC - 5 ） were synthesized by free radical polymerization. The effects of these copolymers on the property of building gypsum were studied based on a comparison with comb-like polycarboxylate-type（PC） and FDN. The results indicate that PC - 4 [ n （ acrylic acid ） ： n （ sodium methallyl sulfonate ） = 6 ： 1 ] shows the best property on water-reducing rate, achieving 22% at the dosage of 0. 3% （ by weight of gypsum）. When the dosage of PC -4 was 0. 3% ,the gypsum paste shows excellent slump retention,the maximum time of which being 60 rain, the water-absorption rate at 2 h of gypsum test block achieved 16%, with 11.5% lower than that of the blank, the dry bending and compressive strength of gypsum test block were enhanced by 30% and 31% respectively than those of the blank, the softening coefficient of gypsum test block achieved 0. 36, with 0. 1 higher than that of the blank. This shows that the capability of set-retarding and water-reducing of PC -4 was excellent on building gypsum system.
出处
《精细化工》
CAS
CSCD
北大核心
2014年第5期654-658,共5页
Fine Chemicals
关键词
线型共聚物
建筑石膏
性能
建筑用化学品
linear eopolymers
building gypsum
property
building chemicals
