Waterborne epoxy curing agent and preparation method and application thereof, and waterborne epoxy resin modified emulsified asphalt

Abstract

The invention belongs to the technical field of road building materials, and particularly relates to a waterborne epoxy curing agent and a preparation method and application thereof, and waterborne epoxy resin modified emulsified asphalt. The invention provides a preparation method of a waterborne epoxy curing agent, which comprises the following steps of: mixing aliphatic polyamine, an organic solvent and epoxy resin under protective gas, and heating to obtain a first intermediate, the aliphatic polyamine containing at least two primary amine groups; mixing the first intermediate with an end-capping reagent, and heating to obtain a second intermediate, the end-capping reagent being one or more of glycidyl tertcarbonate, butyl glycidyl ether, allyl glycidyl ether, phenyl glycidyl ether or 2-toluene glycidyl ether; and removing the organic solvent of the second intermediate, and then adding an acid solution to obtain a waterborne epoxy curing agent. The problem that existing waterborne epoxy resin particles are large, so that waterborne epoxy resin is difficult to uniformly disperse in asphalt can be effectively solved. 本申请属于道路建筑材料技术领域，尤其涉及水性环氧固化剂及其制备方法和应用、水性环氧树脂改性乳化沥青。本申请提供了水性环氧固化剂的制备方法，包括：在保护气体下，将脂肪族多胺、有机溶剂和环氧树脂混合加热，得到第一中间体；所述脂肪族多胺中含有至少两个伯胺基团；将所述第一中间体与封端剂混合加热，得到第二中间体；所述封端剂选自叔碳酸缩水甘油酯、丁基缩水甘油醚、烯丙基缩水甘油醚、苯基缩水甘油醚或2‑甲苯缩水甘油醚中的一种或多种；除去所述第二中间体的有机溶剂，然后加入酸液，制得水性环氧固化剂。本申请能有效解决现有水性环氧树脂颗粒大，导致水性环氧树脂难以均匀分散在沥青中的问题。