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天然橡胶与金属双涂层胶接体系的研究 总被引:1,自引:0,他引:1
采用机械共混和胶料成膜工艺制备了一种酚醛-橡胶型膜状胶黏剂,探讨了主要组份对胶黏剂胶接性能的影响。该膜状胶黏剂与制备的底胶构成的双涂层胶接体系满足天然橡胶与金属的热硫化粘接,扯离强度达到4.0MPa以上,180°剥离强度达到3.0kN/m以上,且试件大都为橡胶内聚力破坏。热失重(TGA)测定膜状胶黏剂固化产物的明显热失重温度达到了350℃以上,其热稳定好。该胶接体系不仅适用于天然橡胶与金属的热硫化粘接,还适用于天然橡胶与树脂基复合材料的热硫化胶接,目前该胶接体系已成功应用于天然橡胶与碳/聚酰亚胺复合材料胶接构件的制造中。 相似文献
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介绍了光学胶接件的几种拆胶方法及其工艺条件。同时建议对采用合成树脂光学胶粘接的光学胶接件,在胶接全过程中应建立严格的检验制度,避免不合格的胶接件流入下道工序,以降低拆胶的困难,并进一步提高光学胶接件的质量。 相似文献
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利用硅烷偶联剂KH560对木粉/聚乙烯复合材料进行表面处理以改善其胶接性能。利用接触角、吸水量、表面形貌以及胶接强度测试等分析方法,研究了硅烷偶联剂处理聚乙烯木塑复合材料胶接接头在水环境中的胶接耐久性能。试验结果表明,机械打磨并偶联剂处理后,聚乙烯木塑复合材表面接触角增加,表面粗糙度增大,胶接强度和耐水性明显提高。偶联剂分子链上环氧基团的"架桥"作用以及甲氧基的憎水作用,是粘接强度和耐水性能提高的主要原因。浸水环境下,聚乙烯木塑复合材料表面粗糙度略有降低;随着浸水时间的延长,表面接触角下降,胶接接头的吸水量增加,胶接强度下降。水环境下聚乙烯木塑复合材料中木质纤维成分的吸水膨胀,是造成胶接强度下降的主要原因。 相似文献
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《中国胶粘剂》2017,(9)
以芳纶纤维/环氧树脂(F-3A/EP)缠绕层作为固体火箭发动机用复合材料壳体、三元乙丙橡胶(EPDM)作为绝热层,采用适宜的胶粘剂制备壳体/EPDM、Φ480 mm壳体/EPDM和大尺寸壳体/EPDM胶接件,并着重探讨了固化条件(温度、时间等)对上述胶接件界面拉伸强度、剪切强度和剥离强度等影响。研究结果表明:3种类型的试样经130℃固化6 h后,其界面拉伸强度(3.02 MPa)、剪切强度(5.42 MPa)均明显提高,而Φ480 mm壳体/EPDM和大尺寸壳体/EPDM胶接件的剥离强度均达到5.84 N/mm,说明该胶粘剂及固化工艺完全满足壳体对EPDM绝热层的界面粘接要求;继续提高固化温度或延长固化时间,并不能显著提高胶接件的剥离强度,但对胶接件的成型工艺要求明显提高。 相似文献
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《玻璃钢/复合材料》2019,(12)
为了更加精确地计算风电叶片厚胶层胶接接头的极限承载能力,给出了一种基于虚拟裂纹闭合技术的胶接接头有限元建模方法,研究了粘接胶厚度和铺层结构弯曲刚度对胶接双悬臂梁极限承载能力的影响。首先,给出了基于虚拟裂纹闭合技术的胶接接头极限载荷计算的有限元建模方法;然后,建立了胶接双悬臂梁试验件的有限元模型,并预测了剥离载荷作用下的极限承载能力;最后,基于胶接双悬臂梁的有限元模型,计算了不同粘接胶厚度和铺层刚度下的双悬臂梁极限承载能力。研究结果表明:胶接接头开裂行为可以采用虚拟裂纹闭合法进行模拟,模拟结果与试验结果吻合良好;随着粘接胶厚度的增加,胶接结构承载能力增加;随着铺层结构弯曲刚度的增加,胶接结构极限承载能力增加;基于虚拟裂纹闭合法的胶接接头建模方法,可以用于风电叶片厚胶层胶接接头的失效模拟。 相似文献
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改善芳纶与橡胶粘合性能的处理方法 总被引:4,自引:2,他引:2
综述了改善芳纶与橡胶粘合性能的处理方法,分别对芳纶的表面活化处理、浸渍工艺及采用适当胶料配方和增粘体系的直接粘合工艺进行了评述。 相似文献
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溶胶——凝胶工艺在涂料工业中的应用 总被引:6,自引:0,他引:6
采用溶胶-凝胶法制备的涂料,其涂膜致密牢固,与金属、塑料、玻璃、木材等有很强的粘结强度,涂膜各项性能优异,此法已在材料保护、表面处理技术方面得到应用。较系统地介绍了在涂料工业中采用溶胶-凝胶工艺的原理、涂料的制备及应用前景。 相似文献
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《Journal of Adhesion Science and Technology》2013,27(3):385-391
A method using photoactivatable reagents is described to modify organic polymer surfaces without changing the bulk properties of the material. The reagents contain a benzophenone or other photoactivatable group which, when exposed to light of appropriate wavelength, generates highly reactive intermediates that covalently bond with nearly any organic material. Some general surface characteristics that can be achieved by this approach, on a wide range of materials, are good wettability, good lubricity, passivation, and priming for either adhesion or immobilization of other molecules. This technology provides tremendous flexibility for tailoring surface characteristics for a broad range of applications. Some materials that have desirable bulk properties for specific applications, however, have surface characteristics that make bonding them to other materials difficult. By photocoupling water-soluble polymers onto the surfaces of such materials, the surface properties can be modified to achieve greatly increased bond strengths with conventional adhesives. For example, using such techniques, the strength of bonding two pieces of high-density polyethylene to each other using a cyanoacrylate adhesive was increased by about 17-fold. Similarly, in preliminary experiments, the bond strengths of silicone rubber to polyvinyl chloride, using cyanoacrylate adhesive, were increased by more than 18-fold. This technology offers great potential for surface modification for improved adhesion. 相似文献
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For electrostatic adhesion on a dielectric material, the electrostatic adhesion force gradually increases to a steady value after the voltage exerted onto the interdigital electrodes. However, little has been addressed to reveal governing mechanisms behind this dynamic phenomenon. In this paper, a theoretical model is presented for analysis of the dynamic properties of electrostatic adhesion on dielectric materials. Firstly, the electric field was derived by solving the Laplace equation of the electrical potential for each sub-area using general solution and boundary conditions. Then, the electrostatic adhesion force was obtained using the Maxwell stress tensor formulation. Finally, the dynamic properties of the electric field and electrostatic adhesion force were assessed by evaluating the transient response of the field and force under a step in applied voltages. Experimental studies for verification were conducted by evaluating the adhesion performance of an electrode panel on three different substrate plates: glass, wood and Polyvinylidene Fluoride (PVDF). Results from these experiments are highly consistent with the theoretical model. The overall results of this paper provide theoretical guidelines for systematic optimization of electrostatic adhesion technology in various application scenarios, such as electrostatic chucks, electrostatic suspension systems and electroadhesive wall-climbing robots. 相似文献
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András Kelemen Mihály Gottnek Géza Regdon Jr. 《Journal of Adhesion Science and Technology》2013,27(13):1360-1367
A better recognition of the properties of materials is of great interest in pharmaceutical technology, and especially in the development of modern solid dosage forms. As an example, a knowledge of the force of adhesion of a mucoadhesive preparation is of considerable importance. The aim of the present study was to develop the calibrated equipment suitable for determination of the force of adhesion and for following the process of film deformation during testing. A new instrument is introduced, and the results are presented. 相似文献