Posted to News on 22nd Nov 2007, 09:54
Clear UV-curable epoxy is filled with nanoparticles
Master Bond is launching a new nanosilica-filled one-component UV-curable epoxy, called UV22, that has been developed for coating, sealing and encapsulation applications. It features superb abrasion resistance, excellent optical clarity, low shrinkage and high physical strength properties. UV22 cures rapidly at room temperature upon exposure to a UV light source and is not oxygen inhibited. It has a service operating temperature range of -50degC to150degC (60 to 300degF). Post curing the UV22 material enhances its temperature resistance profile. Adding heat (90-125degC for 30 minutes) gives it a glass transition temperature of 135degC, which is claimed to be far higher than traditional UV systems. The post curing is also effective in increasing chemical resistance to solvents, acids and bases.
UV22 is easy to use. Despite the relatively high percentage of nanoparticles (>35 per cent) added to the UV22, it still retains high transparency and low viscosity without sedimentation due to the agglomerate-free colloidal dispersion of the nanoparticles in the resin. UV22 has a Shore D hardness of >80 and a tensile strength of >4600 psi. It has a refractive index of 1.52 and shrinkage of 1-2 per cent. Its electrical insulation properties are also described as 'superior'. UV22 is 100 per cent reactive and contains no solvents or diluents.
Master Bond supplies UV22 in pint, quart, gallon and 5-gallon containers. It is also available in syringe applicators. Higher viscosity versions are available if required.
