紫胶树脂的胺基化改性及其水性复合涂膜的性能  

Aminated modification of shellac resin and properties of its waterborne coatings

作　　者：张雯雯 彭霄逍 李坤 张弘[3] 马金菊 张加研 ZHANG Wenwen;PENG Xiaoxiao;LI Kun;ZHANG Hong;MA Jinju;ZHANG Jiayan(College of Chemical Engineering,State Forestry and Grassland Administration Key Laboratory of Southwest Forestry Biomass Resources Efficient Utilization in Southwest Region,Southwest Forestry University,Kunming 650233,China;School of Pharmacy,Xinyang Agriculture and Forestry University,Xinyang 464000,China;Institute of Highland Forest Science,Chinese Academy of Forestry,Kunming 650233,China)

机构地区：[1]西南林业大学化学工程学院,西南地区林业生物质资源高效利用国家林业和草原局重点实验室,昆明650233 [2]信阳农林学院药学院,信阳464000 [3]中国林业科学研究院高原林业研究所,昆明650233

出　　处：《林业工程学报》2024年第4期55-62,共8页Journal of Forestry Engineering

基　　金：西南林业大学西南地区林业生物质资源高效利用国家林业和草原局重点实验室开放基金(2021-KF08);河南省科技攻关项目(232102110163);河南省高等学校重点科研项目计划(23A550015);信阳农林学院青年教师科研基金资助项目(QN2022024、QN2021030);信阳农林学院科研促进教学专项课题(kj-2021019)。

摘　　要：利用傅里叶变换红外光谱(FT-IR)、碳核磁共振(13C-NMR)及差示扫描量热仪(DSC)对改性紫胶树脂进行性能表征测试。结果表明,对氨基苯甲酸主要以酯化接枝至紫胶树脂中,改性紫胶树脂氨基物质的量浓度可达1.90 mmol/g,热寿命可由3.9 min延长至11.1 min。对改性紫胶树脂与不同类型聚合物(聚乙二醇、聚乙烯醇、聚丙烯酰胺和羟丙基甲基纤维素)复配后的水性涂膜进行性能测试,结果表明,改性紫胶树脂可通过乙二醛的羰氨反应提高涂膜的固化交联度,从而提升紫胶树脂在不同基材表面的附着力,其中金属基材的附着力可达5.61 MPa,附着力提升92.12%。乙二醛交联可将紫胶树脂的耐冲击、耐盐雾、耐水浸等性能分别提升至120 cm、72 h和720 h;聚乙二醇聚合物的引入还可以在保持涂膜耐水性能、耐盐雾性能的同时,使漆膜弯曲柔韧性得到提升。综上可知,本研究探索了以羰氨反应为基础的紫胶树脂改性新路径,为紫胶树脂的进一步开发和利用提供了新的原料和思路。This study focused on investigating the preparation method of shellac resin modified by p-amino benzoic acid and the examination of the properties of water-based coatings formed by combining amino benzoic acid modified shellac resin and four types of polymers.Firstly,the effect of the amount of p-amino benzoic acid on the thermal life of the modified shellac resin was explored,and the amount of amino benzoic acid was determined.Then the properties of the modified shellac resin,such as acid value,hydroxyl value and color index,were tested.The structure of the modified shellac resin was characterized by the Fourier transform infrared spectroscopy(FT-IR),carbon-13 nuclear magnetic resonance spectrometry(13 C-NMR),and differential scanning calorimetry(DSC).The experimental results showed that the p-amino benzoic acid was mainly grafted into shellac resin by esterification.The consumption of hydroxyl group during esterification reduced the thermal life of the modified shellac resin,and the introduction of amino group increased the melting point of modified shellac resin.The amino molar concentration of the modified shellac re-sin could reach 1.90 mmol/g,and the thermal life could be extended from 3.9 min to 11.1 min.The performance tests of waterborne coatings made by compounding modified shellac resin with different types of polymers,such as polyethylene glycol(PEG),polyvinyl alcohol(PVA),polyacrylamide(PAM),hydroxypropyl methyl cellulose(HPMC),showed that the adhesion of the modified shellac resin crosslinked with glyoxal was significantly higher than that of the modified shellac resin,indicated that the modified shellac resin could improve the curing crosslinking degree of the film through the carbonyl ammonia reaction of glyoxal.Thus,the adhesion of shellac resin on different substrate surfaces was improved,among which the adhesion of metal substrate can reach 5.61 MPa,and the adhesion was increased by 92.12%.The colloidal solution of modified shellac resin added with PVA and PEG had better ductility and uniform c

关 键 词：紫胶树脂 对氨基苯甲酸 水性化 涂膜 

分 类 号：TQ321.2[化学工程—合成树脂塑料工业] S713[农业科学—林学]