本发明属于混凝土外加剂技术领域，尤其公开了一种采用超支化季铵盐改性的复合改性柱撑材料及其制备方法。该复合改性柱撑材料以式Ⅰ所示的超支化多元胺对应的季铵盐或式Ⅱ所示的超支化季铵盐等具有特定结构的超支化季铵盐作为改性材料，由于自身含有支化结构而有别于普通具有长链结构的改性材料，保证了对斜方晶系柱撑材料插层后的层间距更大，CEC容量更高。本发明还公开了以上述复合改性柱撑材料作为稳定剂的无氟无碱速凝剂及其制备方法。该无氟无碱速凝剂较传统无碱速凝剂提高了其中硫酸铝用量达10％以上，使得速凝剂溶液体系的过饱和度显著提高，保证了其在混凝土材料中的优异效果。

The present invention belongs to the technical field of concrete admixtures. Disclosed are a composite modified pillared material modified with a hyperbranched quaternary ammonium salt, and a preparation method therefor. According to the composite modified pillared material, a hyperbranched quaternary ammonium salt having a specific structure is used as a modified material, and differs from a common modified material having a long-chain structure since the material itself contains a branched structure, thereby ensuring that after an orthorhombic pillared material is intercalated, the interlayer spacing is larger, and the CEC capacity is higher. Further disclosed in the present invention are a fluoride-free and alkali-free accelerator comprising the composite modified pillared material as a stabilizer, and a preparation method therefor. Compared with a traditional alkali-free accelerator, the fluorine-free and alkali-free accelerator increases the use amount of aluminum sulfate therein to 10% or above, such that the supersaturation degree of an accelerator solution system is significantly increased, and the excellent effect of the fluorine-free and alkali-free accelerator in a concrete material is ensured.