Recommendations for the Study of Control Measures for Overspray Generated During Bed Liner Application

摘要

Walk-through surveys were conducted at the training facilities of two distributors of diisocyanate based elastomeric truck bed-liner products, and two shops that apply spray-on truck bed-liners. The spray-on bed-liner process involves the application of a protective coating to the bed of pick-up trucks or other surfaces. The objective of these walk-through surveys was to learn about the process and to develop recommendations for the development of measures to control polymeric diisocyanate exposures in the spray-on bed-liner industry. The bed-liner is applied as a two part resin. Part A is a polymeric diisocyanate with varying percentages of diphenylmethane diisocyanate (MDI) isomers, MDI oligomers, and polymeric MDI. Part B is a polyol that reacts with the polymeric diisocyanate to form a tough, resilient elastomeric surface coating. The report describes the spray-on bed-liner process, proposes future studies, recommends control strategies, and presents an engineering control design concept.