Лако-красочные материалы — производство

Epoxy adhesives find applications in various aspects of road making. Two major areas are bullnosing and fixing of reflective road studs. Bullnosing requires a system with good impact and compressive strengths and a pot-life time of 1 to 4h. Cast masses are on the order of 5 to 25 kg, so low-exotherm systems should be used. Fillers and flexibilizers may be included. Fixing of road studs is often performed on roads that are in use, so cure time should be as short as is practicable. Again, good impact and compressive strengths are required.

B. Wood Bonding

Although PVA adhesives for nonstructural applications and formaldehyde-based resins for structural applications have price advantages over epoxies and offer excellent performance, epoxies have advantages in certain applications. First, the open time may be as long as required. Second, with suitable primers they give more reliable bonds on difficult species, such as very dense or oily timbers. Third, they may be used to bond wood to other surfaces, such as metal or concrete, although in this case the formulator will concentrate more on the other substrate, as wood is not a difficult surface for epoxy adhesives. Primers may be emulsions in water or, particularly on oily surfaces, a conventional epoxy reduced to low viscosity with suitable solvents. The adhesive may also contain solvents to reduce viscosity and allow high filler loadings.