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。     

聚乙烯用胶粘剂研究进展

综述了近年来聚乙烯用胶粘剂的研究进展,分析了聚乙烯难粘原因,重点讨论了丙烯酸类胶粘剂、聚氨酯胶粘剂、SBS胶粘剂、压敏型胶粘剂、改性EVA胶粘剂、氯化聚丙烯基胶粘剂以及其它聚乙烯用胶粘剂。最后分析了目前聚乙烯用胶粘剂现状及发展方向。     

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。     

木结构用胶粘剂研究应用进展

介绍了木结构及其所用胶粘剂的特征,分别概述了木结构主要的胶粘剂如酚类胶粘剂、聚氨酯类胶粘剂、环氧树脂类胶粘剂、三聚氰胺类胶粘剂和生物质胶粘剂的研究应用现状.最后分析了木结构胶粘剂发展存在的问题,并展望了其发展趋势.     

光学用透明胶粘剂的研究进展

介绍了光学用透明胶粘剂的性能特点及分类,重点介绍了合成树脂胶粘剂。合成树脂胶粘剂由于粘接强度高,耐高低温性好,能在振动、辐射等苛刻条件下工作,逐渐成为主要的光学透明胶粘剂。重点介绍了合成树脂胶粘剂中的环氧树脂胶粘剂和光固化胶粘剂。探讨了环境因素对胶粘剂光学性能的影响,并且指出环氧树脂和光固化胶粘剂是未采光学透明胶粘剂的发展方向。     

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。     

高固含量水性丙烯酸酯乳液制备及其作为胶粘剂应用进展

高固含量水性丙烯酸酯乳液作为胶粘剂可分为压敏胶粘剂、纸塑复合胶粘剂、塑木复合胶粘剂、木材胶粘剂、建筑胶粘剂、纺织胶粘剂、汽车胶粘剂等;介绍了水性丙烯酸酯乳液的制备及应用,展望了其应用前景与发展方向。     

全球胶粘剂行业发展现状及研究进展

分析了全球胶粘剂的消费、生产等分布情况,介绍了国内相关企业的生产情况,重点综述了主要胶粘剂产品[如PU(聚氨酯)胶粘剂、EP(环氧树脂)胶粘剂、辐射固化胶粘剂、氰基丙烯酸酯胶粘剂和改性丙烯酸酯胶粘剂等]的研究进展。最后探讨了我国胶粘剂行业存在的问题,并且提出了相应的建议。     

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.     

国内PVC材料所用胶粘剂概况

综述近十余年来国内PVC材料所用胶粘剂的研究进展,分类介绍丙烯酸酯类胶粘剂、聚氨酯类胶粘剂、改性过氯乙烯胶粘剂、醋酸乙烯类胶粘剂、氯丁橡胶胶粘剂和环氧树脂类胶粘剂用于PVC材料的粘接概况,讨论了各种胶粘剂所适用的PVC材料范围,并通过剥离强度,粘接强度等主要性能指标分析了各胶粘剂的主要性能。     

增稠在丙烯酸酯乳液胶黏剂分子设计中的作用

在制备乳液胶黏剂时经常要将乳液增稠。本文从减小乳液胶黏剂的表面张力、提高乳液胶黏剂的稳定性、为不使胶黏剂渗入被粘材料、为使胶黏剂涂复的厚度达到一定的要求等四个方面分析了增稠在乳液胶黏剂分子设计中的作用,并对乳液胶黏剂的增稠方法,内增稠和外增稠作了详细的介绍。     

The Effect of Adhesive Thickness on the Mechanical Behavior of a Structural Polyurethane Adhesive

One parameter that influences the adhesively bonded joints performance is the adhesive layer thickness. Hence, its effect has to be investigated experimentally and should be taken into consideration in the design of adhesive joints. Most of the results from literature are for typical structural epoxy adhesives which are generally formulated to perform in thin sections. However, polyurethane adhesives are designed to perform in thicker sections and might have a different behavior as a function of adhesive thickness. In this study, the effect of adhesive thickness on the mechanical behavior of a structural polyurethane adhesive was investigated. The mode I fracture toughness of the adhesive was measured using double-cantilever beam (DCB) tests with various thicknesses of the adhesive layer ranging from 0.2 to 2 mm. In addition, single lap joints (SLJs) were fabricated and tested to assess the influence of adhesive thickness on the lap-shear strength of the adhesive. An increasing fracture toughness with increasing adhesive thickness was found. The lap-shear strength decreases as the adhesive layer gets thicker, but in contrast to joints with brittle adhesives the decrease trend was less pronounced.     

On the intralaminar and interlaminar stress analysis of adhesive joints in plated beams

An improved bimaterial adhesive joint model is proposed for the intralaminar and interlaminar stress analysis of adhesively-bonded interfaces in plated beams with thin or moderately thick adhesive layer. To overcome the limitations or unreasonable assumptions in the existing theoretical joint models, both the shear and normal stresses along two adherend–adhesive interfaces are assumed to be different in the present model, and the adhesive layer is modeled as a simplified 2-D elastic continuum. Deformable interfaces are assembled to establish the continuity conditions between the adherend–adhesive interfaces, and the local deformations near the end of the adhesive layer are fully captured. The longitudinal and transverse displacements of the adhesive layer are introduced as two new independent parameters, and the missing “degrees of freedom” in the conventional elastic foundation models are retrieved. Differential governing equation of an adhesively-bonded bi-layer beam is established, and explicit closed-form expressions of beam forces and interface stresses are derived. Comparisons of the present solution with the existing elastic foundation models as well as the full 2-D continuum elastic solutions by the finite element analysis are conducted to validate the presented model. Parametric studies are then conducted to reveal the roles of the adhesive thickness and local interface deformations on the stress distributions both along the adherend–adhesive interfaces (interlaminar) and through the adhesive layer thickness (intralaminar), from which a feasible measure to reduce the strain or stress concentrations is obtained. The present improved adhesive joint model in plated beams sheds light on the effect of adhesive layer thickness in bimaterial bonding assembly and provides a better understanding of potential interface debonding initiation and its propagation path.     

新型镀铝复合薄膜专用胶粘剂的研究

分析了影响BOPP／VMCPP型镀铝复合薄膜剥离强度的主要因素,即：BOPP和胶粘剂的界面强度;胶粘剂和VM的界面强度;VM和CPP的界面强度,以及胶粘剂的组成、分子结构、相对分子质量分布、单体残存量等,并合成了一种新型的镀铝膜和塑料薄膜复合用聚氨酯胶粘剂;讨论了胶粘剂的相对分子质量、相对分子质量分布、固化温度和时间等因素对粘结性能的影响。试验结果表明：该胶粘剂初粘力强、剥离强度高、溶剂残留量低,适用于快速复合薄膜生产线。     

An improved four-parameter model on stress analysis of adhesive layer in plated beam

The prediction of stresses in an adhesive layer is helpful in revealing the mechanism of debonding failure in plated beams. This study proposes an improved analytical model for the stress analysis of an adhesive layer in a plated beam. The beam and the soffit plate are individually modelled as a single Timoshenko sub-beam with separate rotations, while the adhesive layer is modelled as a two-dimensional elastic continuum in plane stress, which considers different adherend-adhesive interface stresses. The internal forces of the adhesive layer are assumed to satisfy the Timoshenko beam theory, and the shear deformation and bending moment of the adhesive layer can be considered. The internal forces and displacements of the adhesive layer are fully considered in the displacement compatibility equations, and deformable interfaces are assembled so that the effect of interface stresses on local deformation is captured. Based on equilibrium equations and displacement continuity, the governing differential equations of beam forces are derived, and then the analytical solutions of interface stresses and stresses along the thickness of the adhesive layer are obtained. Comparisons of the results of the finite-element analysis and the existing four-parameter model solutions show that the present model is reasonable. The influence of adhesive thickness on stress distributions in adhesive layers is also investigated.     

改性淀粉胶黏剂的研究概况及展望

淀粉以其绿色环保的优点在胶黏剂领域中的应用占有举足轻重的地位,但是单一的淀粉胶黏剂有很多不足之处。满足不了各个领域的多方面需求,因此在一定条件下经过物理、化学或者生物方法对其进行有限度的改性,研制出了各种具有优良性能的改性淀粉胶黏剂并且在各个领域中都有很好的推广应用。根据淀粉胶黏剂在改性方面的研究和开发概况,综合介绍了几种改性淀粉胶黏剂的产物性能及其在包装行业中的推广应用情况,最后指出了淀粉胶黏剂改性的优势及未来发展的方向。     

Environment‐Dependent Adhesive Behaviors of Mussel‐Inspired Coordinate‐Crosslinked Bioadhesives

Mussel‐inspired, coordinate‐crosslinked gels have attracted extensive attention but their adhesive behaviors are still not fully understood. Herein, four mussel‐inspired molecules with different molecular characteristics are synthesized to study their adhesive behaviors. It is demonstrated that their adhesive behaviors are dependent on the environments. For these mussel‐inspired molecules, physiological environment containing relatively low Fe³⁺ contents is appropriate for achieving high adhesive strength. In addition, the mussel‐inspired molecules with positive charge, high molecular weight, or high catechol substitute ratio benefited for improving adhesive strength, however, only in the appropriate environment. In the inappropriate environments (physiological pH, high Fe³⁺ contents), the adhesives show similar low adhesive strength. These environment‐dependent adhesive behaviors are due to the poor interfacial adhesive capacity of the adhesives formed in the inappropriate environments. The study uncovers the adhesive behaviors of mussel‐inspired coordinate‐crosslinked gels and thus may further provide valuable evidences in the design of metal‐crosslinked bioadhesives.     

An efficient analysis model for functionally graded adhesive single lap joints

Employing a functionally graded adhesive the efficiency of adhesively bonded lap joints can be improved significantly. However, up to now, analysis approaches for planar functionally graded adhesive joints are still not addressed well. With this work, an efficient model for the stress analysis of functionally graded adhesive single lap joints which considers peel as well as shear stresses in the adhesive is proposed. Two differential equations of the displacements are derived for the case of an axially loaded adhesive single lap joint. The differential equations are solved using a power series approach. The model incorporates the nonlinear geometric characteristics of a single lap joint under tensile loading and allows for the analysis of various adhesive Young׳s modulus variations. The obtained stress distributions are compared to results of detailed Finite Element analyses and show a good agreement for several single lap joint configurations. In addition, different adhesive Young׳s modulus distributions and their impact on the peel and shear stresses as well as the influence of the adhesive thickness are studied and discussed in detail.     

陶瓷用胶黏剂的研究现状

胶黏剂在陶瓷的修复、生产和连接等许多方面起着重要的作用,综述了陶瓷用胶黏剂的研究现状,在简要介绍陶瓷结构性能的基础上,重点介绍了应用于陶瓷领域的磷酸盐类胶黏剂、硅酸盐类胶黏剂、氧化物类胶黏剂等无机胶黏剂和环氧树脂胶黏剂、酚醛树脂胶黏剂、丙烯酸脂类胶黏剂等有机胶黏剂近年来国内外的研究情况,以促进陶瓷用胶黏剂的发展。     

胶粘剂的现状及发展趋势

文章介绍了胶粘剂的分类,我国的行业现状,对国内外胶粘剂技术现状、发展趋势、应用前景以及存在的问题进行了综述。研制开发高品质、高性能、功能化、特种化"绿色"环保胶粘剂产品,顺应市场新需求,抢占胶粘剂高端市场,改变我国高档胶大量进口的现状,促进我国较为落后胶粘剂工业的发展,是国内胶粘剂生产厂家和科研单位迫在眉睫的任务命。