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杨建红教授课题组在“Progress in Organic Coatings”发表科研论文

   发布时间: 2019-06-03    访问次数: 13

Promotion by Copper (II)-Modified Montmorillonite of the Drying Property of Oriental Lacquer Sap

Yang, Jianhong;Zhu, Jianfeng;Shen, Fengqin;Cai, Jun;Zhou, Ming  

Abstract:A series of hybrid lacquer saps were prepared by adding copper(II)-modified montmorillonite (Cu(II)-MMT) into the raw lacquer. Cu(II)-MMT can effectively accelerate the polymerization of urushiol over a wide humidity range. Addition of 5wt% of Cu(II)-MMT suspension (concentration, 5wt%) into the raw lacquer sap made its touch-free drying time and hardened drying time decrease from each >36days and >36days to 6days and 9days at 36°C and 50% relative humidity and from each >120h and >120h to 5h 40min and 23h 30min at 34°C and 65% relative humidity, respectively. GPC tests proved the acceleration of the urushiol polymerization. Based on the results from UV–vis, FT-IR and NMR, the urushiol polymerization catalyzed by Cu(II)-MMT is similar to that catalyzed by laccase. However, a distinct difference is that the degree of crosslinking of lacquer films increased due to the formation of Sihttps://sdfestaticassets-us-east-1.sciencedirectassets.com/shared-assets/16/entities/sbndOhttps://sdfestaticassets-us-east-1.sciencedirectassets.com/shared-assets/16/entities/sbndC and Alhttps://sdfestaticassets-us-east-1.sciencedirectassets.com/shared-assets/16/entities/sbndOhttps://sdfestaticassets-us-east-1.sciencedirectassets.com/shared-assets/16/entities/sbndC bonds between urushiol and MMT in the drying process. Furthermore, addition of Cu(II)-MMT also improves the gloss and thermo-stability of lacquer films.