纸浆基木材胶黏剂的合成及其性能  

Synthesis, structure and performance of pulp-based wood adhesives

作　　者：刘思辰 杨红星 冉鑫 杨龙 杜官本 LIU Sichen;YANG Hongxing;RAN Xin;YANG Long;DU Guanben(National Joint International Research Center for Biomass Materials,Yunnan Key Laboratory of Wood Adhesives and Adhesives Products,College of Materials and Engineering,Southwest Forestry University,Kunming 650224,China)

机构地区：[1]国家生物质材料国际联合研究中心,云南省木材胶黏剂及胶合制品重点实验室,西南林业大学材料科学与工程学院,昆明650224

出　　处：《林业工程学报》2022年第6期132-139,共8页Journal of Forestry Engineering

基　　金：国家自然科学基金(32171884,32060323,32071688);云南省中青年学术和技术带头人后备人才项目(202105AC160048);云南省基础研究计划(202001AW070017,202101AT070047);云南省科技领军人才支持计划(2017HA013)。

摘　　要：以桉木纸浆为原料制备木材胶黏剂,研究了合成路线、化学结构、胶合性能和胶合界面行为,为纤维素基木材胶黏剂研发和纸浆多元化应用提供理论依据和技术路线。纸浆经高碘酸钠选择性氧化处理,形成高反应活性双醛化纸浆纤维(DAP),利用醛基与支化多胺的氨基之间的反应构建交联网络,获得可固化的纸浆基木材胶黏剂(PWA)。使用傅里叶红外光谱(FT-IR)、X射线光电子能谱(XPS)分析PWA化学结构,利用热重分析仪(TGA)分析其热性能,通过压制胶合板评估胶合性能。实验结果初步证明,双醛化纸浆纤维上的醛基能与支化多胺的末端氨基发生希夫碱反应并形成新的化学键;胶合性能分析结果表明,使用纸浆纤维基木材胶黏剂(PWA)制备杨木胶合板,干状胶合强度1.54 MPa,沸水浸泡3 h胶合强度0.85 MPa,杨木表面经界面活化处理后干强度提升到1.99 MPa,沸水3 h胶合强度提升至1.80 MPa,且与多胺末端氨基数量密切相关。纸浆纤维双醛化后再与支化多胺反应可制备性能优异的木材胶黏剂,界面活化处理可显著提高PWA的胶合性能和耐水性能以及热稳定性,末端氨基数量越多,性能提高越显著。High performance, low cost and environment-friendly wood adhesives were synthesized using eucalyptus pulp as a raw material. The synthetic route, chemical structure, bonding performance, and bonding interface behavior were studied, which would be expected to provide the theoretical basis and the technical route for the research and development of cellulose-based wood adhesives and the diversified application of industrial pulp. First of all, the selective oxidation of the eucalyptus pulp fiber was carried out with sodium periodate as oxidant. Whereupon a dialdehyde pulp(DAP) cellulose with highly chemical reactivity was obtained after the oxidation treatment. Then, a curable pulp-based wood adhesive(PWA) was developed by constructing a covalent crosslinking network based on the reaction between the aldehyde group of dialdehyde pulp cellulose and the rich amino group at the end of a branched polyamine. The Fourier transform infrared(FT-IR) spectroscopy was used to analyze the chemical structure of adhesive samples. The X-ray photoelectron spectroscopy(XPS) was used to further verify the chemical structure and bond composition, and to characterize the active chemical functional groups at wood interfaces. The thermogravimetric ana-lysis(TGA) was used to analyze the thermal properties. In order to evaluate the bonding performance, the pulp-based wood adhesive was applied to poplar three-layer plywood. It was preliminarily proved that the Schiff base reaction occurred between the aldehyde group on dialdehyde pulp fibers and the terminal amino group of branched polyamines and formed some new chemical bonds. The results of bonding performance analysis showed that the dry bonding strength of poplar plywood prepared with PWA was 1.54 MPa, and the re-dried bonding strength was 0.85 MPa after soaking in boiling water for 3 h. It was worth to note that the poplar veneer interface after the activation treatment, the dry strength increased to 1.99 MPa, and the re-dried strength increased to 1.80 MPa. Thanks to the “amide bri

关 键 词：双醛化纸浆纤维 木材胶黏剂 支化多胺 界面处理 耐水性 

分 类 号：TQ43[化学工程]