Development of a Rapid Set Epoxy Adhesive for California Highway Markers.

摘要

Conventional epoxy adhesives reacted with the commonly used polyamine, polyamide or tertiary amine curing agents require 3 to 4 hours to harden in thin films at 75F, 7 or more hours at 50F, much longer at temperatures below 50F and the curing essentially ceases at 30F. When used to bond pavement markers to the road surface or make roadway surface repairs with epoxy mortars, such limitations create serious and hazardous obstructions to the flow of traffic. The California Division of Highways designed and formulated a series of epoxy binders and adhesives based upon the use of a polymercaptan curing agent which cures epoxies in thin films at a rate of 7 to 10 times as fast as the conventional nitrogen based materials, and may be used at temperatures of 30F or lower. This report discusses the development of rapid cure epoxy formulations for the purpose of cementing raised delineating pavement markers to road surfaces. (Author)