氟硅橡胶硫化胶室温硫化粘合研究

研究了酮肟型室温硫化硅橡胶A、B及醋酸型室温硫化硅橡胶C(以下简称粘合胶A,粘合胶B,粘合胶C)3种室温硫化硅橡胶对氟硅橡胶硫化胶的粘合性能。结果表明：粘合胶B的粘合性能最佳,剥离强度可达3 kN/m以上,经燃油浸泡24 h后,剥离强度为2.1 kN/m,离油静置后恢复性能最好;粘合胶C的剥离强度为0,粘合胶A的剥离强度为1.1 kN/m,高于粘合胶C同时段剥离强度,但粘合面出现明显分层,浸泡一定时间后,粘合面发生脱离,丧失粘合能力。室温硫化硅橡胶粘合硫化后的氟硅橡胶效率高、成本低、操作方便,适用于不常接触油的特定场合,应用在某发动机周边,密封效果良好。     

单涂型胶粘剂在橡胶支座中的应用研究

研究单涂型胶粘剂在橡胶支座中的应用。结果表明:与传统双涂型胶粘剂相比,单涂型胶粘剂起硫温度高,处理效率快,适用于高温快速硫化制品;具有较强的工艺适用性及较好的粘合性能,橡胶与金属剥离试样的剥离强度达到11 kN·m~(-1)以上,且试样破坏类型理想;采用单涂型胶粘剂的橡胶支座的刚度高以及耐动态疲劳性能好,可以满足橡胶支座使用要求。     

胶层厚度对环氧胶粘剂使用环境下力学性能影响的试验研究

为了研究不同厚度胶粘剂在其使用环境条件下对力学性能的影响,从两种金属结构环氧胶粘剂中各挑选了两种厚度的胶粘剂,并在不同的使用环境下研究不同胶层厚度对剪切强度、剥离强度、平面拉伸强度和蠕变的影响。研究结果表明:在高低温环境、湿热环境、JP-4燃油浸泡处理的试样件剪切强度、平面拉伸强度性能以及蠕变试验中,0.3 mm的胶层厚度比0.6 mm胶层厚度对胶粘剂的力学性能影响大;在盐雾环境、阻燃液压油浸泡处理的试样件剪切强度以及蜂窝剥离强度试验中,胶层厚度对胶粘剂力学性能的影响不明显;在3型试验液浸泡处理的试样件剪切强度以及滚筒剥离强度试验中,0.6 mm的胶层厚度比0.3 mm胶层厚度对胶粘剂的力学性能影响大。     

蓖麻油基聚氨酯胶粘剂研究

论述了以蓖麻油(BA)为基体材料,PAPI为固化剂的新型聚氨酯胶粘剂的研制。样品经过高低温介质等试验,结果表明,此类胶粘剂能够耐高低温,因油类介质的作用,粘接强度高,是一种极有前途的耐温耐油胶粘剂。     

丁腈橡胶和氢化丁腈橡胶与金属的粘合性能研究

采用不同的开姆洛克(Chemlok)双涂体系胶粘剂,对比研究航空燃油系统常用丁腈橡胶(NBR)和氢化丁腈橡胶(HNBR)与金属(钢30CrMnSiA和铝合金2A12)的粘合性能。结果表明:Chemlok双涂体系对NBR的粘合效果较好,NBR-金属粘合的破坏形式主要为橡胶破坏;橡胶-钢30CrMnSiA的粘合强度大于橡胶-铝合金2A12;面涂型胶粘剂的粘合效果与金属种类有关。     

聚酯帘线与NBR粘合性能的研究

试验研究不同粘合体系对聚酯帘线与NBR粘合性能的影响。结果表明，采用HRH胶粘剂体系的聚酯帘线与NBR的粘合性能优于RFI。表面浸渍体系，前的平均剥离强度比后高282％，H抽出力大11N；扫描电镜断面照片显示，使用HRH胶粘剂体系的橡胶与帘线粘合紧密。     

氧化淀粉胶粘剂添加助剂的研究

研究了在氧化淀粉胶粘剂中加入一些环保型的高分子助剂,通过对氧化淀粉粘合剂耐水性、粘合强度、稳定性等测试,得出最佳配方,并与白乳胶的性能进行了对比分析。结果表明,加入了PVA的氧化淀粉胶粘剂在各方面的性能测试中均优于其他2种助剂,稳定性好,剥离强度可以与白乳胶相媲美,且粘合强度不受粘接正反面的影响。     

汽车底盘用橡胶铰链常见粘合失效形式的分析

介绍汽车底盘用橡胶铰链的分类、金属-橡胶粘合力测试方法和橡胶铰链常见粘合失效形式及原因,实例分析了某橡胶铰链粘合失效的原因和解决方法。橡胶铰链4种粘合失效形式分别为橡胶内部破坏、橡胶与面涂胶粘剂之间断裂、面涂胶粘剂与底涂胶粘剂之间断裂以及底涂胶粘剂与金属粘合失效。准确评价橡胶铰链的粘合性能对橡胶铰链的开发设计甚至汽车底盘的设计具有重要意义。     

铁锚402-1贴塑胶通过鉴定

<正> 上海新光化工厂铁锚402—1贴塑胶1988.8.5通过局级鉴定。402—1胶是室温固化、单组份橡胶基溶液型胶粘剂,含固30～34％,粘度0.8—1.4 Pa·S。粘接聚丙烯薄膜180°剥离强度5 N/cm,粘合Bopp膜与铜版纸印刷品,测强度时纸张破坏,油量转移;粘合Bopp膜与胶版纸印刷     

叠层母排用绝缘胶粘剂的制备及性能研究

以饱和聚酯树脂(SP)为主体树脂,多官能度异氰酸酯为固化剂,成功制备出一种耐高温SP胶粘剂,并将其涂覆在聚酯膜表面,干燥后即得到叠层母排用绝缘胶膜。采用衰减全反射红外光谱(ATR-FTIR)和差示扫描量热(DSC)法研究了SP和多官能度异氰酸酯固化剂的固化反应特性,讨论了固化剂种类对绝缘胶膜剥离强度及高低温冲击性能的影响。结果表明,异氰酸酯固化剂可与SP反应,固化交联后的SP胶粘剂无明显熔点。添加固化剂可以显著提高绝缘胶膜的高温剥离强度、高低温冲击性能,且以芳香族异氰酸酯固化剂交联固化的SP胶粘剂的综合性能优于脂肪族异氰酸酯固化剂固化的SP胶粘剂。     

Interlaminar Bond Strength and Failure Mechanisms in Commercial Flexible Polymer-Metal Laminates

An alternative to the 180° “T” peel test (called simply the “T-peel test” in the USA) was developed by Cropper and Young for the measurement of interlaminar bonding in three-ply polypropylene-aluminium-polyester laminates used in food packaging applications. The effect of temperature on the interlaminar bond strength of three laminate systems has since been studied. In particular, the effect of temperature on both the failure mode and on the adhesive's appearance after testing has been determined. It is shown that as the temperature is raised about 23°C, the laminating adhesive begins to soften and the failure mode changes from almost exclusively adhesive failure at the polyurethane adhesive-aluminium interface to cohesive failure of the polyurethane adhesive itself. The change in the failure mode is accompanied by the appearance of a meniscus instability. The temperature at which the meniscus instability patterns become more prominent correspond to the temperature at which the maximum interlaminar bond strength is attained.

It is thought that this new test can be used to characterise the behaviour of laminating adhesives more fully, both in their change in appearance with temperature, and in their effectiveness in bonding layers together as temperatures are increased above ambient conditions.     

Effect of bonding temperature on the joint strength of polyolefln/butyl rubber and polyolefin/ethylene-vinylacetate copolymer

The effect of bonding temperature on the peel strength of adhesive joints, polyolefin/butyl rubber and polyolefin/ethylene-vinylacetate copolymer, has been investigated. The peel strength, measured at room temperature, undergoes a sharp transition from its low values to higher values as the bonding temperature is changed from below to above, the melting point of the substrate. This increase in peel strength is accompanied by changes in failure mode from the apparent interfacial failure to cohesive failure through the adhesives. Investigation of the interface using Fourier Transform Infrared Internal Reflection spectroscopy and interference microscopy indicates that the sharp increase in the peel strength at the melting temperature of substrate is associated with the presence of an interdiffused layer at the interface.     

Interlaminar Bond Strength and Failure Mechanisms in Commercial Flexible Polymer-Metal Laminates

An alternative to the 180° “T” peel test (called simply the “T-peel test” in the USA) was developed by Cropper and Young for the measurement of interlaminar bonding in three-ply polypropylene-aluminium-polyester laminates used in food packaging applications. The effect of temperature on the interlaminar bond strength of three laminate systems has since been studied. In particular, the effect of temperature on both the failure mode and on the adhesive's appearance after testing has been determined. It is shown that as the temperature is raised about 23°C, the laminating adhesive begins to soften and the failure mode changes from almost exclusively adhesive failure at the polyurethane adhesive-aluminium interface to cohesive failure of the polyurethane adhesive itself. The change in the failure mode is accompanied by the appearance of a meniscus instability. The temperature at which the meniscus instability patterns become more prominent correspond to the temperature at which the maximum interlaminar bond strength is attained.

It is thought that this new test can be used to characterise the behaviour of laminating adhesives more fully, both in their change in appearance with temperature, and in their effectiveness in bonding layers together as temperatures are increased above ambient conditions.     

Peel Strength of Aluminium-Aluminium Joints Bonded by Adhesive Based on Carboxylated Nitrile Rubber-Chlorobutyl Rubber Blend

The peel strength of aluminium-aluminium joints bonded by an adhesive based on carboxylated nitrile rubber and chlorobutyl rubber was found to depend on surface topography and use of a silane primer. Anodization causes a marginal increase in bond strength while the silane primer improves the adhesive joint strength remarkably.

The peel strength was also found to be dependent on test conditions (test rate and temperature). The threshold peel strength value obtained by measurements at low peel rate and high test temperature was found to depend on the type of failure during peeling (cohesive or interfacial) which, in turn, is controlled by the presence of silica filler in the adhesive. Two different threshold values of peel strength were obtained: 60 N/m for interfacial failure (in silica-filled adhesive), 140 N/m for cohesive failure (in unfilled adhesive).     

Nomex蜂窝夹层结构的滚筒剥离破坏分析

本文通过一系列的剥离试验结果分析了有无胶膜情况下，蜂窝夹层结构的剥离强度与破坏模式的关系，提出了粘接边强度与剥离强度的关系，进一步论述了芯子与面板间胶接强度与破坏模式的关系。     

Effect of Surface Roughness on the Adhesive Strength of the Heat-Resistant Adhesive RTV88

Heat-resistant adhesive RTV88 is a hyper-elastic material and so far there have been little research on using RTV88 in adhesive joints. In this study, the effect of surface roughness on the adhesive strength of RTV88 was examined. Aluminum adherends were first sandblasted in order to generate rough surfaces, and then tensile–shear tests on Al/RTV88 single lap joints were performed. The shear strength was shown to be influenced by surface roughness. Peel failure was dominant when the surface roughness was at a low level. However, cohesive failure was the major type of failure when the surface roughness was at a high level. Effective area, peel failure area, and cohesive failure area were introduced to explain the effects of surface roughness on the adhesive strength. An empirical relation for the failure force was proposed, based on these parameters. Tensile tests of the RTV88 bonding was performed in order to obtain the necessary data. Finally, the empirical relation for the failure force was verified by tensile–shear test results.     

Peel Analysis Using the Finite Element Method

Large displacement finite element analysis and subsequent experimental work has been used to investigate the adhesive peel test; at this stage, only elastic behaviour has been considered.

Both non-cracked and cracked configurations have been analysed, representing initial and continuous failure of the peel test. Analysis of the former indicated that initial failure was caused by the adhesive principal stresses driving a crack towards the interface with the flexible adherend. Investigation of the cracked configuration has shown that the amount of mode II loading at the crack tip is significant and is essentially independent of peel angle, load and adhesive or adherend modulus, only decreasing as the adhesive becomes incompressible. Failure (propagation) has been shown to occur at a critical applied bending moment for a particular adherend and adhesive, independent of peel angle. Further, the strength (load)'measured by the peel test is not proportional to the actual strength of the adhesive, a small increase in the adhesive strength causing a much larger increase in the applied peel load.     

Peel Analysis Using the Finite Element Method

Large displacement finite element analysis and subsequent experimental work has been used to investigate the adhesive peel test; at this stage, only elastic behaviour has been considered.

Both non-cracked and cracked configurations have been analysed, representing initial and continuous failure of the peel test. Analysis of the former indicated that initial failure was caused by the adhesive principal stresses driving a crack towards the interface with the flexible adherend. Investigation of the cracked configuration has shown that the amount of mode II loading at the crack tip is significant and is essentially independent of peel angle, load and adhesive or adherend modulus, only decreasing as the adhesive becomes incompressible. Failure (propagation) has been shown to occur at a critical applied bending moment for a particular adherend and adhesive, independent of peel angle. Further, the strength (load)'measured by the peel test is not proportional to the actual strength of the adhesive, a small increase in the adhesive strength causing a much larger increase in the applied peel load.     

G／Epoxy复合材料胶接强度研究

使用G／Epoxy作为底材研究了垫板、结构胶黏剂厚度和底材表面处理对拉伸剪切强度的影响。使用光学显微镜观察了断口形貌。结果表明加垫板能减小试验过程中由于加载偏心引起剥离应力,测试结果较大;结构胶黏剂的厚度和底材表面处理对拉伸剪切强度影响十分明显,随着厚度的增大而减小,经打磨表面裸露出纤维的试样拉伸剪切强度很低。结构胶黏剂厚度较小时以内聚破坏为主,随着厚度的增加破坏模式转变为粘接破坏。     

Influence of wood substrate on bonding joint with structural silicone sealants for wood frames applications

The interest on silicone structural sealants' application in the field of wood window frames is growing fast, because of the introduction of novel production processes and stringent energy performance requirements of buildings. Structural timber-glass-sealant adhesive bonding assessments were carried out in several researches.The goal of this paper is to investigate the mechanism of adhesion and the properties of wood-structural silicone joints in order to understand the failure modes and strength of these bondings. For this purpose, tensile tests on wood-silicone joints were carried out in order to investigate the adhesion strength with different wood species. Moreover, peel tests have been carried out on wood-silicone joints in order to better understand the adhesion properties of the different materials. For this purpose, a dedicated belt was used, to avoid typical problems encountered during the standard peel test execution.In this investigation, both tests on untreated wood-silicone bonding and on coated wood-silicone bonding have been carried out, in order to capture the influence of wood species and wood primers on the adhesion to silicone.The results clearly proved that the adhesion strength between wood and structural silicone is highly influenced by the wood species, and a good correlation was found between tensile strength and breakage load in peel test.These results can be useful when assessing the strength of wood-silicone-double glazing glass joints and when informing FE models of wood frames joints and also to provide indications about optimal structural sealant application modes and selection of silicone typologies in wood frames applications.