Synthesis of UV and thermal dual curing oligomer for solder resist ink using ink‐jet printing

Abstract

A novel solder resist ink for inkjet printing containing the ultraviolet (UV) and thermal dual curing oligomer is introduced in this work. Three kinds of acrylic monomers for the synthesis of the oligomer are successful prepared and their structures are determined by Fourier transfer infrared. Both UV curing process and thermostability are monitored under UV differential scanning calorimetry and thermogravimetric analysis. For the photoreaction process, the oligomer using Lauryl methacrylate as the material of copolymerization possesses the highest reactivity and conversion of carbon-carbon double bond. Besides, this kind of oligomer also owns excellent thermostability, just losing 5.9% of its weight at 288 C. The solder resist inks containing the oligomers and jetting by the inkjet printer are tested with the adhesion, soldering resistance, and other performances, presenting the outstanding heat resistance and wide application prospects.

Key Materials in Solder Mask Ink for Printed Circuit Board

“…The inventor recommended this thermal and UV light dual curing oligomers to be used in epoxy resin SMI for PCB. [21] Besides the changing of monomer or oligomer, the introduction of special functional units into epoxy resin also affects the performance of SMI film remarkably.…”

“…The reason was the oligomer had excellent flexibility and high UV reactivity. The inventor recommended this thermal and UV light dual curing oligomers to be used in epoxy resin SMI for PCB [21] …”

Research advances in UV-curable self-healing coatings

“…Photopolymerization, which uses ultraviolet (UV) light as an energy source to cure photosensitive materials, has many advantages, such as energy efficiency 1 and eco friendliness, 2 high efficiency, 3 speed 4 and time-space controllability. 5 Aer decades, with the continuous development of the basic theory and application technology of photopolymerization, this kind of technology has been widely applied in the elds of coating, 6 ink, 7 and adhesive. 8 UV-curable coating, which has been widely used as protective and decorative surface coating because of its energy efficiency, eco friendliness, and low cost, 9 can be completely cured in as little as a few seconds under the action of UV light.…”

“…Photopolymerization, which uses ultraviolet (UV) light as an energy source to cure photosensitive materials, has many advantages, such as energy efficiency 1 and eco friendliness, 2 high efficiency, 3 speed 4 and time-space controllability. 5 After decades, with the continuous development of the basic theory and application technology of photopolymerization, this kind of technology has been widely applied in the fields of coating, 6 ink, 7 and adhesive. 8 …”