Effect of process conditions on the properties of surface‐modified organic pigments encapsulated by UV‐curable resins

Abstract

Aqueous dispersions of nanoscale organic pigments were successfully prepared via ball milling and ultrasonication. The dispersed organic pigments were encapsulated into UV-curable resins via a miniemulsion technique. Critical factors that affected the dispersion and encapsulation stability were investigated. The encapsulated organic pigments were characterised with transmission electron microscopy, thermogravimetric analyses, Fourier Transform-infrared spectra and zeta potential. The results clarified that the type of dispersing agent plays an important role in achieving maximal dispersion stability. Encapsulated organic pigments showed greater dispersion stability, and better wettability than the original pigments. Polyester tetra-acrylate oligomer can stabilise the mini-emulsion from diffusion degradation and inhibit phase separation with time. 1,6-Hexandiol dimethacrylate was the monomer of choice for ink-jet printing inks. Furthermore, it was found that monomer/oligomer and pigment/resin ratios were more influential and needed to be optimised. Thermal analysis, ultracentrifuge sedimentation and morphologies provided supporting evidence for the encapsulation of organic pigments into UV-curable resins.

Preparation and mechanism of free‐radical/cationic hybrid photosensitive resin with high tensile strength for three‐dimensional printing applications

“…In this work, the hybrid resin was prepared by the following steps. 30 g PUA and 70 g ACMO were degassed under vacuum for 2 h, after that E-44 with different contents (10,20,30,40, and 50 g)was added and the mixture was stirred in a three-neck flask at 50 C for 20 min. After the liquid prepolymer, the obtained sample was then cooled to room temperature, Irgacure 261 (4 wt%) and Irgacure 819 (1 wt%) were added into the mixture under vigorous stirring, respectively.…”

“…As a result, 3D printing technology has been developed rapidly and becomes a research hotspot in many countries around the world. [7][8][9][10][11] Among different Zijun Yanga and Junyang Shana contributed equally 3D printing approaches, stereolithography (SLA) has been widely used in which a special control system is utilized to control an ultraviolet (UV) laser beam to scan photopolymers based on the profile data of each crosssection. [10][11][12][13] In the local region, where the UV light passes, the photosensitive resin absorbs the light and is rapidly cured by a photo-polymerization process, forming a thin layer.…”

“…Comparing with the conventional subtractive manufacturing processes, 3D printing has many advantages including the short manufacturing cycle, the capability to fabricate complex models, 6 and reduced material waste, which enables it to be used for a wide range of applications, such as tissue engineering, digitized manufacturing of metallic components, materials for energy, food processing etc. As a result, 3D printing technology has been developed rapidly and becomes a research hotspot in many countries around the world 7–11 . Among different 3D printing approaches, stereolithography (SLA) has been widely used in which a special control system is utilized to control an ultraviolet (UV) laser beam to scan photopolymers based on the profile data of each cross‐section 10–13 .…”

Formulation and characterization of pigmented inkjet inks containing aminopropyl/vinyl/silsesquioxane for jet printing onto polyester fabrics

“…Modification of organic pigments by polymeric dispersant or their derivative is a common strategy that can significantly improve the stability of pigment dispersions (Yuan et al, 2005;Wijting et al, 2008;Fu et al, 2011;Hakeim et al, 2015aHakeim et al, , 2015bHakeim et al, 2018aHakeim et al, , 2018bHakeim et al, , 2018cHakeim et al, 2020).…”

Design and Synthesis of Free-Radical/Cationic Photosensitive Resin Applied for 3D Printer with Liquid Crystal Display (LCD) Irradiation

“…To date, 3D printing technologies have been developed rapidly and become a research hotspot in many countries all over the world [ 7 , 8 , 9 , 10 , 11 ]. Among all kinds of 3D printing technology, the stereolithography apparatus (SLA) rapid prototyping method is a typical 3D printing technology with a special control system using an ultraviolet (UV) laser beam to scan photosensitive polymers according to the profile data of each cross-section [ 10 , 11 , 12 , 13 ]. In a local region, the photosensitive resin absorbs the energy from UV light with special wavelengths and is then cured rapidly by a photo-polymerization process, and finally forms a thin layer [ 14 ].…”