PREPARATION OF AN EPOXY THERMOPLASTIC TRAFFIC MARKING MATERIAL ON A COMMERCIAL SCALE

An Epoxy Thermoplastic (ETP) Pavement Marking Material has been manufactured on both pilot and semi-commercial scales using formulations provided by the Federal Highway Administration project monitors. A total of 3752 gallons (14,260 liters) of two white formulations and 250 gallons (950 liters) of a yellow formulation were prepared using standard batch mixing techniques. To minimize hot mixing time for the epoxy resins, solid components were preheated prior to addition to each batch. The product was cast into open-top silicone coated fiber boxes containing approximately 2 gallons (7.6 liters) each for shipment. Physical and chemical properties of the ETP materials were measured and found to fall within anticipated limits except for product viscosities, which were in some instances higher than expected. Present pigments used for the yellow formulation must be handled with all due attention to current industrial hygiene standards. Using the manufacturing process described herein, including the batch time-cycles described, on difficulty in the manufacture of ETP materials by simple mixing procedures is anticipated. (FHWA)