Abstract
Intumescent transparent coatings consisting of allyl-functionalized phosphonitrile (HABP), trimethylolpropane tris(3-mercaptopropionate) (TMMP) and 1H,1H,2H,2H-perfluorodecanethiol (PFDT) were prepared via photo-induced thiol-ene reactions without photoinitiator, and then fabricated onto wood surfaces to achieve both flame retardancy and hydrophobicity. The effects of PFDT content on the waterproof and fire prevention of the samples were investigated. The chemical structure of the HABP was characterized with FTIR, NMR and HRMS techniques. The surface compositions and transparency of the coatings were characterized by XPS and UV–Vis spectrophotometer. The sample could pass the UL-94 V-0 test and the double bond conversion (DCC=C) of the corresponding coating reached 93.3%. Results showed that the more the coating contained PFDT, the better the coated samples exhibited hydrophobicity and flame retardancy. From a broader perspective, thiol-ene reactions without initiators are showing significant potentialities for rapidly designing functional coatings on wood substrates, which will be develop more functional coatings for other application fields.
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