木质素改性蓖麻油基水性聚氨酯的制备与性能  

Preparation and Performance of Lignin-Modified Castor Oil-based Waterborne Polyurethane

作　　者：李鸽 马煜骄 谭诗源 赵培坤 聂强 韦代东 梁晟源 谢治辉[1] 雍奇文 LI Ge;MA Yujiao;TAN Shiyuan;ZHAO Peikun;NIE Qiang;WEI Daidong;LIANG Shengyuan;XIE Zhihui;YONG Qiwen(College of Chemistry and Chemical Engineering,China West Normal University,Nanchong 637009,China;Sichuan Xingcheng Gongzhu New Building Materials Co.,Ltd,Guangyuan 628021,China;College of Chemistry,Jilin University,Changchun 130012,China;Guangzhou Chemical Grouting Engineering Co.,Ltd.,CAS,Guangzhou 510650,China;CNOOC Changzhou Paint and Coatings Industry Research Institute Co.,Ltd.,Changzhou 213016,China)

机构地区：[1]西华师范大学化学化工学院,四川南充637009 [2]四川兴成共筑新型建材有限公司,四川广元628021 [3]吉林大学化学学院,吉林长春130012 [4]中国科学院广州化灌工程有限公司,广东广州510650 [5]中海油常州涂料化工研究院有限公司,江苏常州213016

出　　处：《皮革科学与工程》2024年第4期28-35,共8页Leather Science and Engineering

基　　金：广元市科技计划重点研发项目(22ZDYF0001);材料腐蚀与防护四川省重点实验室开放基金项目(2022CL17)。

摘　　要：以聚四氢呋喃、异佛尔酮二异氰酸酯、蓖麻油为主要原料,热水解木质素为改性剂,2,2-二羟基甲基丙酸为亲水扩链剂,采用预聚体法制备了一系列的木质素改性蓖麻油基水性聚氨酯(LCWPU)。考察了LCWPU胶膜的结构特征、热性能、疏水性以及光泽度。探讨了木质素的含量及n_(NCO)/n_(OH)对LCWPU胶膜热稳定性能、力学性能和耐水性能的影响。结果表明,随着木质素含量的增加以及n_(NCO)/n_(OH)的增加,LCWPU胶膜的吸水率降低,拉伸强度显著提高;当木质素含量为3%,且n_(NCO)/n_(OH)为4.5时,LCWPU胶膜的耐水性及拉伸强度最高,接触角可达95.7°,吸水率为14.3%,拉伸强度为62.9 MPa,断裂伸长率为297.5%。所设计的木质素改性蓖麻油基水性聚氨酯在皮革涂饰剂、哑光木漆等领域具有良好的应用前景。A series of lignin-modified castor oil-based waterborne polyurethanes were synthesized using tetrahydrofuran,isophorone diisocyanate,and castor oil as the primary raw materials.Lignin was employed as a modifying agent through hydrothermal treatment of lignocellulose,and 2,2-dihydroxymethylpropionic acid was utilized as a hydrophilic chain extender.The pre-polymerization method was adopted for the preparation of these lignin-modified castor oil-based waterborne polyurethanes(LCWPU).The structural characteristics,thermal properties,crystallization,hydrophobicity,and glossiness of the LCWPU films were investigated.The effects of lignin content and the molar ratio of n_(NCO)/n_(OH) on the thermal stability,mechanical properties and water resistance of LCWPU films were investigated.The results indicate that the LCWPU films had an amorphous structure.With the increase of lignin content and n_(NCO)/n_(OH) molar ratio,the water absorption of the LCWPU films decreased and the tensile strength increased significantly.Notably,when the lignin content was 3% and the n_(NCO)/n_(OH) molar ratio was 4.5,the LCWPU film demonstrated the highest water resistance and tensile strength,with a contact angle of 95.7°,a water absorption of 14.3%,a tensile strength of 62.9 MPa,and an elongation at break of 297.5%.The designed LCWPU has good application prospects in the fields such as leather finishing agents and matte wood paints.

关 键 词：木质素 蓖麻油 水性聚氨酯 胶膜 皮革涂饰 

分 类 号：TQ323.8[化学工程—合成树脂塑料工业]