摘要
为改善紫胶(SHL)树脂韧性,采用桐油酸(EA)以Diels-Alder反应与SHL树脂进行加成,制备得到增韧紫胶(TS)树脂,通过凝胶色谱(GPC)、红外光谱(FT-IR)和核磁共振碳谱(13C NMR)对其结构进行解析;向SHL和TS树脂中引入单宁酸(TA),制得SHL-TA和TS-TA复合涂膜,并利用电化学工作站、耐中性盐水和耐中性盐雾测试分析TA、EA对SHL树脂涂膜防蚀性能的影响。研究结果表明:产物TS树脂具有较好韧性,当m(SHL)∶m(EA)为1.8∶1时制备的TS-3涂膜断裂伸长率高达381.81%;此外,EA改性还增加了SHL树脂膜的疏水性,TS-3涂膜的静态水接触角可达95.01°。TA的引入提高了涂膜在金属基材上的附着力,TA以及EA的共同作用增强了SHL树脂涂膜的防蚀性能。最佳的防蚀体系为TS-3-TA涂膜,在3.5%NaCl中浸泡48 h后,涂膜的极化电阻仍有36.3 kΩ,优于其他涂膜。在碱体系中制备的TS-3-TA涂膜的耐中性盐水时间为120 h,耐中性盐雾时间为168 h。
In order to improve the toughness of shellac(SHL)resin,eleostearic acid(EA)was added to shellac resin through Diels-Alder reaction to prepare toughened shellac(TS)resin,and its structure was analyzed by gel chromatography(GPC),infrared spectroscopy(FT-IR)and 13C nuclear magnetic resonance(13C NMR).And then,tannic acid(TA)was added to prepare SHL-TA,and TS-TA composite coating.The effects of TA and EA on the anti-corrosion properties of shellac resin coating were analyzed by electrochemical workstation,neutral salt water resistance and neutral salt spray(NSS)resistance tests.The results showed that the TS modified by EA through the Diels-Alder reaction exhibited good toughness.When the weight ratio of SHL and EA was 1.8∶1,the elongation at break of TS-3 coating was as high as 381.81%.In addition,the hydrophobicity of shellac coating was increased by the modification of EA,and its static water contact angle reached 95.01°.The addition of TA could improve the adhesion of the coating on the metal substrate,and the combined action of TA and EA could enhance the anti-corrosion of SHL coating.The best corrosion protection system was TS-3-TA coating.After immersion in 3.5%NaCl for 48 h,the polarization resistance of the coating was still 36.3 kΩ,far more higher than that of other coatings.And the time of neutral salt water resistance and neutral salt spray(NSS)resistance tests of TS-3-TA,which was prepared in alkali system,was 120 h and 168 h.
作者
李春吟
李坤
孙彦琳
刘义稳
张弘
雷福厚
LI Chunyin;LI Kun;SUN Yanlin;LIU Yiwen;ZHANG Hong;LEI Fuhou(Research Institute of Resources Insects,Chinese Academy of Forestry,National Forestry and Grassland Bureau Characteristic Forest Resources Engineering Technology Research Center,Kunming 650224,China;College of Chemical Engineering,Kunming University of Science and Technology,Kunming 650500,China;Wufeng Chicheng Biotechnology CO.,LTD.,Research Centers of Chinese Gall Effective Cultivation and Deep Processing Engineering Technology,National Forestry and Grassland Administration,Yichang 443413,China;Guangxi Key Laboratory of Chemistry and Engineering of Forest Products,Guangxi Collaborative Innovation Center for Chemistry and Engineering of Forest Products,Guangxi University for Nationalities,Nanning 530006,China)
出处
《林产化学与工业》
CAS
CSCD
北大核心
2021年第4期1-9,共9页
Chemistry and Industry of Forest Products
基金
国家重点研发计划资助项目(2018YFD0600404)。
关键词
桐油酸
增韧紫胶树脂
单宁酸
涂膜防蚀
eleostearic acid
toughened shellac resin
tannin acid
anticorrosion coating
