建设工程常用胶粘剂的发展与展望

基于胶粘剂的发展脉络,讨论了胶粘剂的分类及介绍了常用类型的胶粘剂如：硅酸盐胶粘剂、磷酸盐胶粘剂、硫酸盐胶粘剂、丙烯酸酯胶粘剂、环氧树脂胶粘、剂酚醛树脂胶粘剂和脲醛树脂胶粘剂的特点,归纳了各种胶粘剂的应用场景,重点分析了胶粘剂在建筑混凝土领域的应用,提出了胶粘剂在建筑混凝土领域的发展前景及未来的发展方向。     

基于空间设计的5089结构胶改性制备与应用策略研究

基于环境空间设计需要,对空间设计用5089胶粘剂进行了改性处理,对比分析了3种不同改性胶粘剂的动态热机械分析曲线和玻璃化转变温度-固化温度关系曲线。结果表明,与改性胶粘剂A相比,相同固化温度下改性胶粘剂B和改性胶粘剂C的储能模量都相对较高,且在固化温度为100～130℃时,改性胶粘剂A、改性胶粘剂B和改性胶粘剂C都兼具弹性和粘性;耐热性从高至低顺序依次为改性胶粘剂B、改性胶粘剂C、改性胶粘剂A,且改性胶粘剂B在固化温度100、110和130℃时的玻璃化转变温度都高于原始5089胶粘剂,表明改性胶粘剂B在此温度下的胶接接头耐热性能都优于原始5089胶粘剂。     

探秘车用胶粘剂及其发展趋势

根据胶粘剂的定义与功能,阐述了胶粘剂的特点、分类和组成;胶粘剂在汽车装配和维修中的应用;指出了胶粘剂的发展潜力和趋势。     

我国木材工业用胶粘剂的现状、存在问题及对策

本文介绍了脲醛树脂胶粘剂、酚醛树脂胶粘剂、三聚氰胺甲醛树脂胶粘剂、聚醋酸乙烯乳液胶粘剂、聚氨酯胶粘剂、热熔胶粘剂等木材工业用胶粘剂的现状和研究进展。分析了目前木材工业用胶粘剂存在的问题,初步提出了解决问题的对策。     

芳纶防弹无纬布热熔胶粘剂的研发

对芳纶防弹无纬布用热熔胶进行筛选,优选了橡胶弹性体类胶粘剂作为芳纶防弹无纬布生产用热熔胶,并对该类热熔胶粘剂与传统的丙烯酸酯胶粘剂和聚氨酯胶粘剂在常温、高低温、浸水和耐老化条件下进行了对比试验,结果表明,该热熔胶粘剂中SIS-Kraton D1107胶粘剂防弹等综合性能均明显优于其它胶粘剂,可以作为芳纶防弹无纬布生产用胶粘剂。     

环境友好型胶粘剂的研究进展

本文综述了近年来各种环境友好型胶粘剂的研究进展,并对生物质材料木材胶粘剂、氰酸酯胶粘剂、废聚苯乙烯泡沫塑料制备的无毒胶粘剂、魔芋胶胶粘剂、聚丙烯酸酯乳液型胶粘剂的性能和应用进行了全面讨论,展望了未来环境友好型胶粘剂的应用和发展前景.     

风电叶片用胶粘剂剪切疲劳性能和蠕变性能分析

简述了胶粘剂在风电叶片中的重要性,风电叶片大多采用环氧胶粘剂。从叶片的设计需求角度,对比测试了国产胶粘剂和进口胶粘剂的玻璃化转变温度、剪切疲劳和蠕变性能,并对两种胶粘剂的粘接断面进行形貌扫描,简单分析得出:进口胶粘剂的粘接断面是比较典型的韧性断裂,国产胶粘剂的粘接断面呈现韧性和脆性结合体;提高胶粘剂的韧性,并不断改良增韧体系和环氧树脂基体的相容性是国产胶粘剂亟待解决的问题。     

地板布粘接用胶粘剂施工性探讨

介绍了双组分聚氨酯胶粘剂、PUR、环氧胶粘剂和氯丁橡胶胶粘剂4种胶粘剂在地板布粘接上的应用,分别从组成、环保性、力学性能和施工性能等4个方面比较了上述胶粘剂的优缺点。结果表明,PUR在粘接地板布和地板方面更有优势。     

聚酰亚胺胶粘剂的改性研究

介绍了聚酰亚胺(PI)胶粘剂改性的研究进展,详细讨论了缩合型PI胶粘剂、热塑性PI胶粘剂和加成型PI胶粘剂的发展现状、最新进展、性能(物理机械性能、耐热性、耐化学性和成型加工性)及其在各领域中的应用。总结了PI胶粘剂存在的具体问题和未来的发展趋势。     

基于磁共振与高频超声的颈椎重建胶固性能与应用研究

基于磁共振与高频超声的颈椎重建用胶固化性能和拉剪强度性能要求的需要,以双酚A型环氧树脂和3种常温固化型胺类固化剂为主要原料,制备了3种不同组分的常温固化型胶粘剂,对比分析了胶粘剂的固化性能、室温拉剪强度和断口形貌。结果表明,随着固化温度的升高,3种胶粘剂的固化时间都呈现下降的趋势;在相同固化温度下,3种胶粘剂固化时间从小至大顺序依次为：胶粘剂1号、胶粘剂2号、胶粘剂3号,即胶粘剂1号的固化时间最短。随着固化温度升高,3种胶粘剂试样的拉剪强度平均值都呈逐渐上升的趋势;在相同固化温度下,3种胶粘剂试样的拉剪强度从大至小的顺序依次为：胶粘剂1号、胶粘剂2号、胶粘剂3号;弹性模量从大至小顺序依次为：胶粘剂1号、胶粘剂2号、胶粘剂3号;断后伸长率从小至大的顺序依次为：胶粘剂1号、胶粘剂2号、胶粘剂3号。虽然胶粘剂1号的固化时间最短,但其拉剪强度平均值最低,推荐重建用常温固化型胶粘剂使用胶粘剂3号。     

导电胶的研究新进展

介绍了近年来发展迅速的几种典型的导电胶(如纳米导电胶、复合导电胶、紫外光固化导电胶和无导电粒子导电胶等),阐述了导电胶可靠性研究中环境影响试验的研究现状,展望了今后导电胶的应用前景和发展方向。     

聚氨酯胶粘剂的研究进展

综述了聚氨酯胶粘剂的合成、特性和种类。概述了近年来国内外聚氨酯胶粘剂的研究和应用进展,重点介绍了聚氨酯胶粘剂的发展动态和几类主要的聚氨酯胶粘剂,并对其进行了分析,结合实际情况对今后聚氨酯胶粘剂的发展方向作出了展望。     

我国胶粘剂工业现状及应用进展

介绍了我国胶粘剂工业的现状以及各类胶粘剂的应用进展,其中主要包括环氧树脂胶粘剂,聚氨酯胶粘剂,有机硅胶粘剂,以及耐高、低温等特种胶粘剂,并对国内胶粘剂市场的前景作出了展望。     

Analysis and design of adhesively bonded tee joints with a single support plus angled reinforcement

In this study, stress and stiffness analyses of adhesively bonded tee joints with a single support plus angled reinforcement were carried out using the finite element method. It was assumed that the adhesive had linear elastic properties. In actual bonded joints, some amount of adhesive, called the spew fillet, accumulated at the free ends of the adhesive layer; therefore, the presence of the adhesive fillet at the adhesive free ends was taken into account. The tee joints were analysed for two boundary conditions: a rigid base and a flexible base. In addition, each boundary condition was analysed for four loading conditions: tensile, compressive, and two side loadings. The stress analysis showed that both side loading conditions resulted in higher stress levels in the joint region in which the vertical plate and supports are bonded to each other, as well as in the adhesive layer in this region for both rigid and flexible base boundary conditions. In adhesively bonded joints, the joint failure is expected to initiate in the adhesive regions subjected to high stress concentrations; therefore, the peak adhesive stresses were evaluated in these critical regions. In the case of the rigid base, the peak adhesive stresses occurred at the corner of the vertical plate, which was bent at right angles, for the tensile and compressive loading conditions, and in the adhesive fillet at the upper free end of the vertical adhesive layer-vertical support interface for both the left and the right side loading conditions. However, in case of the flexible base, the peak adhesive stresses occurred in the adhesive fillet at the right free end of the horizontal adhesive layer-horizontal support interface for the tensile, compressive, and the right side loading conditions, and in the vertical adhesive fillet at the upper free end of the vertical adhesive layer-vertical support interface for the left side loading condition. Furthermore, the adhesive stresses showed a nonlinear variation in the direction of the adhesive thickness for all boundary and loading conditions. The left side loading condition, among the present loading conditions, which results in the highest adhesive stresses is the most critical loading condition for both boundary conditions. The effects of horizontal and vertical support lengths on the peak adhesive stresses and on the joint stiffness were also investigated and the appropriate support dimensions relative to the plate thickness were determined based on the stress and stiffness analyses.     

氧化淀粉粘合剂的合成及其在新型肥料中的应用

通过正交试验确定了合成氧化淀粉粘合剂的最佳工艺及对粘合剂粘度影响显著的因素,分析了粘合剂的稳定性和生物毒性,同时对其在新型肥料中的应用做了一定研究。试验结果表明:氧化剂用量和温度对粘合剂的粘度影响显著,粘合剂的稳定性好、无生物毒性,粘度为30mPa．s的粘合剂成粒性能最好。     

Strength of adhesive joints with adherend yielding: I. Analytical model

A sandwich element can be isolated in all two-dimensional adhesive joints, thereby simplifying the analysis of strain and stress. An adhesive sandwich model has been developed that accommodates arbitrary loading, a bilinear adherend stress-strain response, and any form of nonlinear adhesive behavior. The model accounts for both the bending deformation and the shear deformation of the adherends. Stress and strain distributions in the adhesive were obtained by solving a system of six differential equations using a finite-difference method. For a sample adhesive sandwich, the adhesive strains and stresses from the new model were compared with those of other models. Finally, the model was coupled with an analytical solution for the detached section of an adhesive joint in peel. The stress and strain distributions in the adhesive and the root curvature of the peel adherend were then compared with finite element results. An accompanying article in this issue uses the model with experimental peel data to investigate the suitability of various adhesive failure criteria.     

木质素在胶粘剂中的应用研究进展

介绍了木质素的结构、分类与性能以及改性方法,综述了木质素在酚醛树脂胶粘剂、脲醛树脂胶粘剂、三聚氰胺甲醛树脂胶粘剂、环氧树脂胶粘剂以及聚氨酯胶粘剂中的应用研究进展,并对今后的研究方向作了展望。     

STRENGTH OF ADHESIVE JOINTS WITH ADHEREND YIELDING: I. ANALYTICAL MODEL

A sandwich element can be isolated in all two-dimensional adhesive joints, thereby simplifying the analysis of strain and stress. An adhesive sandwich model has been developed that accommodates arbitrary loading, a bilinear adherend stress-strain response, and any form of nonlinear adhesive behavior. The model accounts for both the bending deformation and the shear deformation of the adherends. Stress and strain distributions in the adhesive were obtained by solving a system of six differential equations using a finite-difference method. For a sample adhesive sandwich, the adhesive strains and stresses from the new model were compared with those of other models. Finally, the model was coupled with an analytical solution for the detached section of an adhesive joint in peel. The stress and strain distributions in the adhesive and the root curvature of the peel adherend were then compared with finite element results. An accompanying article in this issue uses the model with experimental peel data to investigate the suitability of various adhesive failure criteria.