环氧化天然橡胶对豆粕胶黏剂性能的影响  

Effect of Epoxidized Natural Rubber on the Performance of Soybean Meal Adhesives

作　　者：刘晓蓉 俞振宇 王开立 董友明 李延军 詹先旭 李建章 Liu Xiaorong;Yu Zhenyu;Wang Kaili;Dong Youming;Li Yanjun;Zhan Xianxu;Li Jianzhang(College of Materials Science and Engineering,Nanjing Forestry University,Nanjing 210037;Dehua TB Decoration New Material Co.,Ltd.,Huzhou 313200;College of Materials Science and Technology,Beijing Forestry University,Beijing 100083)

机构地区：[1]南京林业大学材料科学与工程学院,南京210037 [2]德华兔宝宝装饰新材股份有限公司,湖州313200 [3]北京林业大学材料科学与技术学院,北京100083

出　　处：《林业科学》2024年第6期128-135,共8页Scientia Silvae Sinicae

基　　金：江苏省高等学校自然科学研究面上项目(21KJB220014);第70批中国博士后科学基金面上资助(21KJB220014)。

摘　　要：【目的】以豆粕(SM)为主要原料,通过构建双交联网络结构,提升豆粕胶黏剂的耐水胶合性能和固化胶层韧性,为豆粕胶黏剂的产业化应用提供理论依据和技术指导。【方法】利用环氧化天然橡胶(ER)和丙三醇三缩水甘油醚(PTGE),在豆粕胶黏剂体系构建双交联网络结构,研究不同环氧值ER对豆粕胶黏剂化学成分、黏度、吸湿性、残留率、热稳定性、断面形态等的影响,表征所制备杨木胶合板的耐水胶合强度。【结果】1)环氧值为50%的ER-50协同环氧交联剂PTGE改性豆粕胶黏剂(SMP/ER-50),其耐水胶合强度为1.02 MPa,相比对照组提升292.3%,达到国家Ⅱ类杨木胶合板标准;2)扫描电子显微镜显示,SMP/ER-50胶黏剂的固化胶层断面出现均匀相分离结构,可有效提升胶黏剂的韧性;3) SMP/ER-50胶黏剂具有优异的耐水性能,其残留率为90.54%,较对照组提升26.65%;吸湿性为19.28%,较对照组降低14.99%。【结论】SMP/ER-50胶黏剂耐水胶合性能和固化胶层韧性显著提高的主要原因是PTGE和ER-50在豆粕胶黏剂体系中形成致密的双交联网络结构,阻止水分浸入,提高胶黏剂的耐水胶合强度;双交联网络中,当受到外力作用时,ER吸收部分应力,可起到能量耗散作用,进而实现豆粕胶黏剂的增韧增强。【Objective】With soybean meal(SM)as the main raw material,the double cross-linked network structure was constructed to improve the water-resistant bonding performance and the toughness of the cured adhesive layer of SM adhesive,which provided theoretical basis and technical guidance for the industrial application of soybean meal adhesive.【Method】Epoxidized natural rubber(ER)and glycerol triglycidyl ether(PTGE)were used to construct a double cross-linked network structure in soybean meal adhesive system.The effects of ER with different epoxy values on the chemical composition,viscosity,moisture uptake,residual rate,thermal stability,and cross-section morphology of modified SM adhesive were studied,and the wet shear strength of the prepared poplar plywood was characterized.【Result】1)ER-50 with 50%epoxy value and PTGE(epoxy crosslinking agent)were used to modify SM adhesive.The wet shear strength of the modified SM adhesive(SMP/ER-50)was 1.02 MPa,which was 292.3%higher than that of the control group and reached the national standard of class Ⅱ poplar plywood.2)It was observed by scanning electron microscope that the cross-section of the cured adhesive layer of SMP/ER-50 adhesive appeared to have a uniform phase separation structure,which effectively improved the toughness of the adhesive.3)SMP/ER-50 adhesive had excellent water resistance,and its residual rate was 90.54%,which was 26.65%higher than that of the control group.The moisture uptake was 19.28%,which was 14.99%lower than that of the control group.【Conclusion】The main reason for the improvement of water resistance and toughness of SMP/ER-50 adhesive was that PTGE and ER-50 formed a dense double crosslinking network structure in the adhesive system,which prevented water immersion and improved the water resistance of SMP/ER-50 adhesive.In the double cross-linking network,ER absorbs part of the stress and dissipates the energy when subjected to external force,thus achieving the toughening and strengthening of the SMP/ER-50 adhesive.

关 键 词：豆粕胶黏剂 环氧化天然橡胶 增强增韧 耐水胶合强度 双交联网络 

分 类 号：TQ432[化学工程]