Study on the properties of UV-curing turpentine polyurethane acrylate coating

The UV-curable turpentine polyurethane acrylate prepolymer( TPUA) was synthesized by TDI,self-made turpentine polyester polyols and hydroxypropyl acrylate. Then the UV curing coating was prepared by TPUA,photoinitiator and reactive diluent. The effects of photoinitiator and reactive diluent type,amount and ratio on the coating properties were investigated by the tests of gel fraction,hardness,adhesion and mechaincal property and TG analysis. The results indicated that the hardness,adhesion,tensile strength and elongation at break of the coatings was 4 H,0 level,13. 3 MPa,214. 2% ,respectively at the conditions as followed:complex photoinitiator of ITX and 1173,m( ITX) ∶ m( 1173) = 1∶ 0. 5,photoinitiator amount 6% ( based on the prepolymer) ; complex reactive diluents of two functional reactive diluent EB154 and three functional reactive diluent TMPTA ,m( EB154) ∶ m( TMPTA) = 3∶1,diluent amount 64% ( based on the prepolymer). The coatings also had good thermal stability.