Abstract
An increased demand for new and improved coating systems, for environmental & health & safety and performance reasons, have appeared during the recent decades. Currently, there is new interest in preparation of thin UV curable urethane acrylate (UA) composite coatings with short-term properties. Cellulose based additives: nitrocellulose, cellulose acetate butyrate, sucrose benzoate and silica were evaluated to determine their influence on unreacted composite characteristics (viscosity, pigment suspension stability) and characteristics of cured film (ultimate tensile strength, elongation at break, surface gloss, surface scratch resistance and film adhesion loss time). The most suitable additive content was found to provide required viscosity. All additives increase surface scratch resistance, but cellulose based additives increase surface gloss values and decrease the time of adhesion loss. Silica has great effect on the interaction between linear and hyperbranched urethane acrylates, which has crucial influence on the stability of uncured pigmented mixture samples.
Highlights
Light induced curing in polymer coating systems has been intensively studied because of its association with environmental protection, lower energy consumption and rapid curing even at the room temperature [1]
UVcuring technology has been considered as an alternative to traditional solvent-borne coatings, because of its ecocompatible manufacturing process and excellent properties, such as high hardness, gloss, scratch and chemical resistance [1]
Their properties are influenced by their functionality, the type of isocyanate, and the type and molecular weight of polyol used in the synthesis
Summary
Light induced curing in polymer coating systems has been intensively studied because of its association with environmental protection, lower energy consumption and rapid curing even at the room temperature [1]. Most commercially used UV curable compositions are based on acrylic functional monomers and oligomers [3]. Their properties are influenced by their functionality, the type of isocyanate, and the type and molecular weight of polyol used in the synthesis. Some of the commonly used acrylic monomers (especially the multifunctional acrylic monomers) have a strong odor, and are skin and eye irritants Due to their low molecular weight, additional problems may arise as there could be a high amount of extractables and considerable shrinkage could occur. The high reactivity of acrylate monomers and oligomers means that radical-type polymerization can be initiated with only a small amount of photoinitiators (Fig. 1) [3]
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