An Easy Fabrication Method to Prepare Inexpensive UV–Cured Transparent Silicone Modified Polyacrylate Coatings with Good Adhesion and UV Resistance

Abstract

UV–curable polyacrylate is widely used in free–radical type UV–cure coating systems, the disadvantages of which including poor thermal stability and UV resistance can be overcome through chemical modification by silicone. However, it is a remarkable fact that the strategies for fabrication UV–cured silicone modified polyacrylates are somewhat complicated and the price of the products may be much expensive than pure UV–cured polyacrylates. In this work, an easy fabrication method to prepare inexpensive UV–cured transparent silicone modified polyacrylate coatings with good adhesion and UV resistance performance was developed from copolymers of acylates and thiol silicone resin by UV initiated thiol–ene click reaction without UV initiator. The striking results with a high application value should be emphasized that when the amount of thiol silicone resin is only one wt.% of the copolymer of acrylates, the UV–cured coatings obtained exhibit fairly good performance. These coatings prepared exhibit transparency higher than 96% (800 nm), adhesion property to glass slides can reach grade 0, pencil hardness can reach 6H, water absorption is less than 0.16%. In particular, it is observed obviously that the silicone modified polyacrylate coatings exhibit better UV resistance performance than the coating prepared with only copolymers of acrylates initiated by UV initiator 1173. It is proved that it is actually an easy fabrication method to prepare inexpensive UV–cured transparent silicone modified polyacrylate coatings with high performance by UV initiated thiol–ene click reaction of copolymers of acylates and thiol silicone resin.

High Efficiency and Low Migration Hyperbranched Silicone Contain Macrophotoinitiators for UV-Cured Transparent Coatings

“…Materials with high transmittance can be applied in optical devices [ 1 , 2 , 4 , 5 , 33 ] and there are still some challenges in development of coatings with high transmittance [ 1 , 2 , 4 , 5 ]. The transmittance of the coatings prepared with different amount of HBSMI–5 was studied as shown by Figure 4 .…”

“…The migration rate of UV initiator in coatings was investigated by placing the coatings in water at room temperature for 24 h and then kept at 60 °C/20 mmHg for 24 h, then the degree of migration was calculated as a percentage of the loss mass in the original mass of the coatings. Transmittance, pencil hardness, adhesion property were measured according to references [ 1 , 2 , 3 , 4 , 5 ].…”

“…UV-curing technology has drawn more and more attention in many fields such as coatings [ 1 , 2 , 3 , 4 , 5 ], 3D printing [ 6 , 7 ], biomaterials [ 8 ] because of its environmentally friendly and high efficiency advantages. A conventional UV-curing system usually is a composition of UV-curable polymers, reactive monomers, additives, and a photoinitiator or photoinitiator system [ 9 ].…”

UV-Cured Transparent Silicone Materials with High Tensile Strength Prepared from Hyperbranched Silicon-Containing Polymers and Polyurethane-Acrylates

“…The UV-cured materials were prepared according to Scheme similar to refs and . As a typical procedure, about 0.4 g of homogeneous mixtures of HBPSH and PUAs was deposited on about half of the glass slides and kept away from light for 24 h under ambient temperature to let the coatings be as smooth as possible; then, the coatings with a thickness of about 0.5 mm were cured by UV (ZB1000, Changzhou Zibo Electron Technology Co., Ltd., laser wavelength 365 nm, radiation intensity 10.6 mW cm –2 , the distance of the slides to the light is 20 cm).…”

“…The load is 100 N at a loading rate of 60 mm/min. Transmittance, pencil hardness, degree of curing contents, and adhesion property were measured according to refs. ,, UV resistance measurement of the UV-cured material was conducted in a UV test chamber of 10.6 mW cm –2 . The cross-linking density of UV-cured materials was evaluated by a swelling experiment similar to the reference shown in Table S3 .…”