Authors : Santi Kulsiriswad, Kawee Srikulkit and Onusa Saravari
Abstract: Oligolactide diols (OL-OHs) were synthesized by ring opening reaction of L-lactide with 1,6-hexanediol (HD) at 160°C for 3 h. The amount of HD was varied in order to obtain low molecular weight OL-OHs. An Oligolactide Acrylate (OL-A) was then synthesized by functionalizing an OL-OH with acrylic acid at 130°C for 16 h. OL-OHs and the OL-A were characterized by 1H-NMR, FTIR and GPC. The viscosities of OL-OHs were measured by Brookfield viscometer. 1H-NMR and FTIR results confirmed that OL-OHs were synthesized successfully from lactide and HD as starting materials. It was found that an increase in the HD amount led to lower molecular weight OL-OHs having lower viscosity. The 1H-NMR and FTIR results of the OL-A indicated that the OL-OH was functionalized with acrylic acid. A screen printing ink was formulated from the OL-A. Cured ink film achieved by UV curing was characterized by FTIR. In addition, adhesion of the obtained OL-A-based ink on various substrates was comparable with an ink made from commercial polyester acrylate.
Santi Kulsiriswad, Kawee Srikulkit and Onusa Saravari, 2016. An Oligolactide Acrylate for UV-Curable Screen Printing Inks. Journal of Engineering and Applied Sciences, 11: 2775-2780.