Structural design and performance study of a biobased UV/moisture dual-curing coating for UV inadequate curing conditions

UV curable coatings have been widely used for their advantages of environmental protection and high curing efficiency. However, there are also some problems in the use of UV curable coatings, such as poor light transmission of colored coatings, shadow parts are difficult to accept light and can not be cured. In order to solve the problems existing in the curing process of UV curable coatings, the establishment of UV/ moisture dual curing system can effectively solve these problems. Using castor oil (CO), polytetramethylene ether glycol (PTMEG), isophorone diisocyanate (IPDI), hydroxyethyl methacrylate (HEMA) and tetrahydrofuran acrylate (THFA) as raw materials, a series of polyurethane prepolymers were synthesized by structural design and a series of UV/ moisture dual-curable coatings were prepared. The experimental verification, UV/ moisture dual curing system coating, not only solves the problem of traditional UV coating curing, and has better performance than UV coating, coating curing dual curing coating has excellent heat resistance and mechanical strength, tensile strength up to 8.4 MPa, small volume shrinkage, excellent weather resistance. This is a curing strategy for UV coatings that cannot fully accept UV light, and provides a new idea for the preparation of new environmentally friendly coatings by bio-based materials.