共查询到19条相似文献,搜索用时 156 毫秒
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石油发酵尼龙改性环氧胶粘剂的研究 总被引:3,自引:0,他引:3
石油发酵尼龙改性环氧胶粘剂是一种胶接强度高和抗冲击性能、耐湿热性能好的胶粘剂。本文研究了该胶粘剂的最佳配方和胶接工艺,测试了其耐湿热性能,讨论了各组份用量(尼龙、环氧树脂、双氰双胺固化剂)、尼龙与环氧树脂配比以及固化条件对该胶粘剂胶接强度的影响. 相似文献
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本研究设计了“十字交叉法”陶瓷胶粘剂剪切蠕变试验装置,选取刚性环氧树脂及柔性硅酮结构胶进行剪切蠕变试验,研究了环境温度、剪切应力、粘结面积等因素对胶粘剂剪切蠕变的影响,通过模型拟合对胶粘剂的剪切蠕变行为进行了分析和预测,探究了两种胶粘剂的蠕变破坏模式。结果表明:采用十字交叉法能够准确便捷地测试陶瓷胶粘剂的蠕变性能。增大胶粘层柔性、提高环境温度、增大剪切应力都会加速蠕变的发展,但粘结面积对蠕变速率无明显影响。刚性环氧树脂胶粘剂试样的蠕变失效形式为粘结层内聚破坏及界面脱粘,符合时间硬化模型;柔性硅酮结构胶试样失效形式为粘结层内聚破坏,符合Burgers模型。 相似文献
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Amir Hossein Daei-Sorkhabi 《Journal of Adhesion Science and Technology》2019,33(16):1790-1805
Nowadays, the use of adhesive and adhesively bonded joints have been considerably appreciated in the industry due to the dramatic reduction in bonding strength, reduced stress concentration, rust prevention, uniform bonding of the bonding surface and a significant reduction in costs compared to other types of permanent joints such as welding. In this study, the effect of adhesive thickness on creep behaviour of a single lap adhesive joint with the aid of Abaqus FEM software is investigated. It should be noted that the two-layer and two-dimensional models are considered, in which their adhesive layer is made of a reinforced epoxy resin with 0.5% carbon fiber and the adherend layers are made of carbon steel plates, which is affected by tensile forces. Since the main purpose of this paper is to study the effect of adhesive thickness on the adhesive joints behaviour, the effects of the distribution of shear stress, effective stress and creep strain were studied in different thicknesses of the adhesive layer. The results show that by increasing the thickness, the stress and the creep strain decrease, and over time, the stress decreases and the creep behaviour of adhesives increases. 相似文献
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以环氧树脂(EP)为基体树脂、有机硅为偶联剂,成功研制出一种常温固化的建筑用EP/有机硅单组分胶粘剂,并对其力学性能、耐老化性能、耐盐雾性能和耐介质性能等进行了测定。结果表明:该胶粘剂固化前呈黏稠状液体,可常温固化,施工性能较好;其拉伸强度超过15MPa,剪切强度超过10MPa,并具有较好的耐介质性能;该胶粘剂避免了传统EP胶粘剂在施工方面的诸多不足之处,具有良好的应用前景。 相似文献
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The aim of this research is to study the influence of moisture absorption at low moisture contents on the creep behaviour of an epoxy adhesive in steel bonded joints. Single lap joints were manufactured using high strength steel adherends and a two-component epoxy adhesive. The single lap joints were tested at load levels corresponding to average lap shear stresses of ± 5%, 15%, 30% and 45% of the dry lap shear strength in both 40 °C air and 40 °C distilled water. Specimens were not pre-aged to be able to analyse the coupled effect of moisture and loading. The test results show that an increase in the load level resulted in an increase in the instantaneous strain and in the creep strain rate. The creep strain of single lap joints loaded in water was generally larger than for the ones loaded in air. For joints loaded in water the creep behaviour was found to be dependent on the moisture concentration in the adhesive. At low moisture percentages creep was suppressed, resulting in a lower instantaneous strain. At higher moisture percentages creep was promoted, resulting in a larger strain rate. The suppression of creep at low moisture percentages is attributed to water molecules bonding to the epoxy macromolecules, resulting in a reduction in molecular mobility and a smaller creep strain. At higher moisture percentages the plasticizing effect of the water dominates, resulting in a larger creep strain. The Maxwell three-element solid model and Kelvin-Voigt three-element solid model were used to simulate the creep behaviour of the single lap joints loaded in air and water. The models gave good representations of the creep response across the different load levels in both water and air, they were however unable to give a correct representation of the instantaneous strain of the single lap joints loaded in water. This is attributed to the models being unable to account for the present short-term relaxation process that is dependent on the moisture concentration. 相似文献
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采用羟基磷灰石(HA)对环氧树脂结构胶进行改性。对改性后结构胶的力学性能进行测试。实验表明:随着HA的掺量增加,环氧结构胶的压缩强度、冲击强度、粘钢剪切强度提高、拉伸强度略有降低;当羟基磷灰石的掺量为5%时。环氧树脂结构胶的压缩强度、冲击强度分别为92MPa、6.8kJ/m2,比纯环氧树脂基体提高28%和70%;当羟基磷灰石的掺量为7%时,环氧树脂结构胶的粘钢剪切强度为26.4MPa.比纯环氧树脂基体提高55%,羟基磷灰石对环氧树脂有较好的增强增韧作用。 相似文献
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以双酚A多聚甲醛酚醛树脂(BPA-PA酚醛树脂)、二甲基二甲氧基硅烷和环氧氯丙烷为原料,通过酯交换反应和亲核取代反应得到硅改性BPA-PA酚醛环氧树脂。采用傅里叶变换红外光谱(FTIR)、X射线光电子能谱(XPS)分析进行结构确证。结合非等温DSC、T-β外推直线和FTIR分析研究了最佳固化工艺条件。探讨了不同硅烷添加量对硅改性BPA-PA酚醛环氧树脂性能的影响。最后以硅改性BPA-PA酚醛环氧树脂为基体树脂,加以导电填料和助剂,制备出中温型导电胶。对导电胶进行拉伸剪切强度、体积电阻率和热重测试分析,结果显示:自制硅改性BPA-PA酚醛环氧树脂导电胶拉伸剪切强度达到20.18MPa、体积电阻率达到7.44×10-4Ω·cm,残炭量达到68.89%。相对市售E-51环氧树脂所制导电胶,自制硅改性BPA-PA酚醛环氧树脂导电胶拉伸剪切强度提高5.73MPa,体积电阻率降低3.86×10-4Ω·cm,残炭量提高7.49%。 相似文献
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采用氨基硅油和液体端羧基丁腈橡胶(CTBN)对环氧树脂进行化学改性,制备出室温固化耐热环氧胶粘剂。探讨了氨基硅油和CTBN的加入量、环氧树脂种类等对胶粘剂粘接性能的影响。实验结果表明:用氨基硅油和CTBN共同改性环氧树脂制得的胶粘剂性能与末改性树脂相比有显著的提高;酚醛环氧树脂F-44和环氧树脂E-51进行复配时,所得胶粘剂的粘接性能较佳。 相似文献