栲胶改性氨基磺酸系减水剂的工艺研究

利用栲胶部分取代苯酚制改性氨基磺酸系减水剂,研究了其改性工艺,结果表明较佳改性的改性工艺条件为:栲胶占栲胶与苯酚总质量的25%~37.5%,反应时间3 h、温度90℃、pH值9.0~11.0。改性产物的分散性能较未改性产物略有下降,但2 h流动度损失增大。当掺入量为0.5%,水灰比为0.28:1时,掺改性产物和掺未改性产物的净浆流动度分别为240和252 mm。

Study on Technology of Modified Aminosulfonic Acid-based Superplasticizer by Vegetable Tannin

In this paper the modifying technology of vegetable tannin in place of phenol partially to produce aminosulfonic acid-based superplasticizer was studied.The result indicates that the better modified technological conditions are as follow:mass percent of vegetable tannin to total vegetable tannin and phenol is between (25%)-(37.5%),reaction time is about (3 h),temperature is about (90℃),and pH is between 9.0-11.0.The modified product has a little worse dispersing capability than that of(unmodified) product,but its slump loss is a little bigger.When the dosage in cement is (0.5%),and the water-cement ratio is(0.28 :1),the fluidity of cement paste added modified and unmodified product is 240 and (252 mm),respectively.