Abstract
A novel polyurethane-acrylate (PUA) polymerized in situ with montmorillonite (MMT) was synthesized to improve the surface properties of self-healing coatings used for ancient wood. For better dispersion and interaction, natural MMT was initially modified to dihydroxy organo-montmorillonite (OMMT). The prepared self-healing PUA coatings were painted on ancient wood and the surface properties tested, characterized, and compared to pure PUA and natural MMT-added PUA. Those results showed that natural MMT was modified to dihydroxy OMMT by cation exchange. The dihydroxy OMMT was polymerized in situ during synthesis by reactions between OH and NCO groups. The PUA polymer incorporated within MMT to form an exfoliated structure. After painting ancient wood, the surface contained no obvious bulges and the roughness increased slightly. Due to OMMT addition, the adhesion and hardness of OMMT modified PUA increased to 1 class and 2H, respectively, which is acceptable for indoor woodenware. The abrasive resistance was also improved. Furthermore, dihydroxy OMMT promoted the self-healing of PUA. After 30 s of healing, damages disappeared.
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