Effect of Calcium Carbonate and Methylethyl Ketone on the Performance of Hardboard Surface Modification by Ultraviolet Radiation Curing Method

Abstract

A variety of polymeric films were developed to improve the properties of hardboard surface. Polyester acrylate (M‐6100) oligomer, and three different types of monomers and photoinitiator (Irgacure‐651) were employed to prepare the polymeric films. The monomers are 2‐ethyl hexyl acrylate (EHA), tripropylene glycol diacrylate (TPGDA) and trimethylol propane triacrylate (TMPTA). Pendulum hardness and gel content of films prepared by various formulations of oligomer and monomers under UV radiation were characterized against the number of passes for selection of suitable films. The monomer, TMPTA was selected to apply for surface coating with oligomer on hardboard for their optimum properties. Monomers, various properties, such as, pendulum hardness, gloss, abrasion and adhesion tests, indent length and depth, adhesion chipped off area, etc. of coated hardboard surface were determined. Filler, CaCO₃, was incorporated into the solution. The hardness increases with increasing the amount of CaCO₃ and then decreases. The effect of an additive, such as MEK was also investigated.

Keywords:

• hardboard
• surface modification
• UV curing
• CaCO₃ filler
• MEK
• UV‐radiation