Study On The Relationship Between Acrylate Monomers Composition And Viscosity And Aging Performance Of UV Coatings

Viscosity is the main physical characteristic of liquid coating, and it can describe the rheology behavior of coating. The rheology behavior has a great effect on the storing stability, application and film forming property of coatings. It is significative to study the relationship between monomers composition and viscosity, or rather to predict the viscosity of mixed monomers with the viscosity of pure monomers in theoretical research of rheology and industrial application. Because of extensive application in outdoor, higher requirements are claimed for the light aging performance of UV curing coatings. UV monomers play an important role in UV curing coatings system. Viscosity of coatings can be adjusted by monomers, and all kinds of properties of UV curing coatings can be adjusted by monomers too. Depend on different requests, monomers mixtures are usually used.This paper reported the study on the relationship between acrylate monomer composition and viscosity by drawing into some parameters, such as solubility parameterδ, van der Waals' volume V, activation energy E and so on. This paper also reported the study on the effect of acrylate monomers on aging performance by glossiness test, luminousness test and infrared spectroscopy analysis. The results indicated that:1. Viscosities can be calculated according to such equations lgη=∑p ilgηiandlgη=∑q ilgηi, where (?)The linear relative coefficients of aforementioned equations were close to one;2. Calculated viscosity values with aforementioned equations were closer to experimental results than that of treated with reported manners in references for simple molecule mixtures, and average relative errors were limited to 5.41%~11.79%, 4.99%~7.60% respectively. For long chain intricate molecule mixtures, average relative errors were 1.12%;3. Calculated viscosity values with aforementioned equations were closer to experimental results at higher temperatures than that at lower temperatures.4. Cured films of lower monomers content showed a better light stability;5. Cured films of more TPGDA showed a better light stability.