新型交联聚丙烯酰胺/膨润土复合防水材料的研究

使用过氧化物-叔胺氧化还原引发剂体系在室温条件下快速合成交联聚丙烯酰胺/膨润土复合材料。该复合材料中膨润土的含量可达到70%, 其吸水膨胀速度快, 浸水24 h后, 吸水体积膨胀率可达到其最大吸水体积膨胀率的80%以上, 吸水体积膨胀率较高, 吸水膨胀后不开裂, 不分散, 可以被用做吸水膨胀类型防水材料。影响其吸水体积膨胀率的主要因素是膨润土的含量。使用X射线衍射(XRD)、红外(FTIR)和热重(TG)对复合材料的结构进行了表征和分析, 结果表明, 膨润土在聚合过程中除了层间距有所增大外, 基本结构不变, 而且分散度提高; 吸水性复合材料的热稳定性提高。

Study on New Type Cross-linked Polyacrylamide/Bentonite Waterproof Composite

Peroxide-tertiary anine oxidation-reduction initiator system was used to synthesize cross-linked polyacrylamide/bentonite composite quickly at room temperature. The composite may contain 70% bentonite. Its water-swelling speed is fast. The volume swelling rate of the composite after 24 hrs' submersion is 80% of the maximum swelling rate. Since it has a high swelling rate but no crack and dispersion after water swelling, the composite can be used as water-swelling waterproof material. The main factor affecting the volume swelling rate is the content of bentonite. The structure of the composite was characterized and analyzed by XRD, FTIR and TG. The test results proved that the structure of bentonite did not change except that the interlamellar spacing increased a little during its aggregation. The dispersion property and thermal stability of the composites was enhanced thereby.