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.
Highlights
UV curing technology has been extensively employed in various fields including coatings, inks, adhesion and so forth for energy saving, fast curing speed and mild curing conditions [1,2,3]
UV–curable polyacrylate is widely used in free–radical type UV–cure coating systems owning to their convenience to be designed in various molecular structures with various properties, together with their relatively low cost [4,5,6]
Resistance of polyacrylates can be achieved by copolymerization with silicone materials [7,8], it is a remarkable fact that the strategies for fabrication UV–cured silicone modified polyacrylates reported by these references are somewhat complicated and the price of the products may be much expensive than pure UV–cured polyacrylates because the cost of the silicone raw materials are to some extent more expensive than acrylates
Summary
UV curing technology has been extensively employed in various fields including coatings, inks, adhesion and so forth for energy saving, fast curing speed and mild curing conditions [1,2,3]. Some defects of polyacrylate, including poor thermal stability and UV resistance, need to be improved for further applications. Improvement in thermal stability and UV resistance of polyacrylates can be achieved by copolymerization with silicone materials [7,8], it is a remarkable fact that the strategies for fabrication UV–cured silicone modified polyacrylates reported by these references are somewhat complicated and the price of the products may be much expensive than pure UV–cured polyacrylates because the cost of the silicone raw materials are to some extent more expensive than acrylates. It looks wonderful to fabrication silicone modified polyacrylates possessing the advantages of both polyacrylate and silicone material using a little few silicone raw materials with a small increase in costs.
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