Influence of Monomer on Structure, Processing and Application Characteristics of UV Curable Urethane Acrylate Composite Coatings

Increased interest in the esthetical natural nail coatings have encouraged more in-depth studies particularly of UV curable coatings: their formation, processing, structure, use characteristics and removing [1, 2]. Typical requirement for nail coatings is good adhesion, but preferably for the short time of functioning (usual 2-4 weeks) [3, 4]. The objective of this study is to explore some of mentioned above aspects for UV curable system composed of urethane acrylate oligomers and diverse monomer types

UV-activated Polymerization Composite Coatings

An increased demand for new and improved coating systems, for both 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 1) . Different additives (nitrocellulose, cellulose acetate butyrate, sucrose benzoate, silica) were chosen and their influence on composite characteristics (elasticity, toughness, scratch resistance, polymerization, surface gloss, viscosity, solubility and stability) was evaluated 2) . The results showed that the cellulose based additives provide the possibility of rapid loss of adhesion of these composites after performing its function. Silica has great effect on the interaction between linear and hyperbranched urethane acrylates, which further has crucial influence on the stability of uncured pigmented mixture samples

Influence of Monomer on Structure, Processing and Application Characteristics of UV Curable Urethane Acrylate Composite Coatings

Increased interest in the esthetical natural nail coatings have encouraged more in-depth studies particularly of UV curable coatings: their formation, processing, structure, characteristics and removing. Typical requirement for nail coatings is good adhesion, but preferably for the short time of functioning (usual 2-4 weeks). This study investigated the impact of four different monomers (tertiobutyl cyclohexyl acrylate (TBCHA), ethylene glycol dimethacrylate (EGDMA), tetrahydrofurfuryl acrylate (THFA), hydroxypropyl methacrylate (HPMA)) to viscosity of uncured mixture and degree of conversion, mechanical properties, surface gloss, micro hardness and adhesion loss for cured films. Specific coating application requires comparatively high coating flexibility and stability of deformation characteristics. This can be achieved with composition containing 30% of monomer TBCHA, what shows ultimate elongation εB = 0,23 - 0,24, modulus of elasticity E = 670-710 MPa and comparatively constant properties in 72 hours (ΔE = 1.3%, ΔεB=6.0%). A composition with 40% of TBCHA shows the fastest coating destruction achieving adhesion loss within 3 min

Additives in UV-Activated Urethane Acrylate Polymerization Composite Coatings

Thin UV curable coating systems is an important research field from the industrial perspective due to the improved environmental profile and wide varieties of characteristics. When used for short-term applications as coatings on natural nail for esthetical and medical reasons, the system may be manipulated to attain various properties, either desired or required by the manufacturer e.g. ensuring both excellent long-term properties (deformability, toughness, and good adhesion) and short-term properties (ability to be destroyed quickly after use). Performance of thin UV curable urethane acrylate composite coatings was investigated depending on the content of the additive. Nitrocellulose (NC), cellulose acetate butyrate (CAB), sucrose benzoate (SB), and silica were evaluated to determine their influence on unreacted composite characteristics (viscosity, suspension pigment stability) and reacted film characteristics (ultimate strength, elongation at break, surface gloss, surface micro hardness, and film adhesion loss). According to the tests performed all additives increase the modulus of elasticity. CAB and NC increase the elongation at break values, and strongly increase the uncured gel viscosity, what makes it inconvenient for application