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研究了用于蜂窝夹层结构粘接的阻燃结构胶膜的化学流变特性与蜂窝粘接性能。通过流变仪研究了胶膜固化过程中化学黏度的变化,考察了固化反应(温度、时间)、阻燃剂、增韧剂对体系化学流变特性的影响。分析了流变特性和胶瘤形成在蜂窝夹层结构粘接过程中的作用,并测试了蜂窝夹层结构的剥离和平面拉伸性能。结果表明:阻燃剂的加入使得体系100℃前的黏度有所升高,固化活性略有降低,最低黏度温度从112℃推迟到120℃;加入增韧剂后的胶黏剂的黏度显著提高,制备的阻燃胶膜最低黏度在50Pa.s左右,固化过程中具有适宜的流动性和胶瘤形状,固化后具有较高的滚筒剥离强度和平面拉伸强度。 相似文献
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《化学与粘合》2021,(1)
正蜂窝夹心胶黏剂J-71、J-123、J-80蜂窝夹芯胶粘剂J-71:多节点T型剥离强度(kN/m)室温:≥2.3 150℃,1.0多节点T型剥离强度(kN/m)J-123:多节点T型剥离强度(kN/m)室温:≥2.8 150℃≥1.0 175≥0.7多节点T型剥离强度(kN/m)特点:粘接强度高,工艺性能好,耐热性优良。J-123胶可用于制造高密度的铝蜂窝芯材。J-80:T型剥离强度室温:≥3.0kN/m特点:表面适应性好,节点强度高,耐久性能优异,主要用于Nomex纸蜂窝的制造,可在-100℃-175℃长期使用。固化工艺:固化温度180℃±5℃;时间为2~3h;固化压力:0.5 MPa±0.1MPa。 相似文献
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研究了端胺基液体丁腈橡胶(ATBN)改性环氧-醚胺体系的固化反应及胶黏剂的粘接性能。根据Ellerstein法计算固化反应活化能为77.3kJ/mol^-1,根据峰值法计算固化反应活化能为63.7kJ/mol,该体系最佳固化温度为39~82℃。经过对胶黏剂的粘接性能和和增韧相态的研究,发现在该固化体系中所形成橡胶相的粒径大小对胶黏剂的性能有较大影响,实验证明该体系在60℃固化温度时分散相粒子平均粒径为1~2μm,在室温固化条件下分散相粒子平均粒径为2~4μm,分散相中橡胶粒子粒径小于2μm时体系增韧效果最佳,胶黏剂具有优异的粘接性能。 相似文献
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采用耐热酚醛树脂杂化了磷酸盐胶黏剂,以纳米氧化铝、氧化锆和氧化锌为固化剂,制备了一种对C/C和C/SiC复合材料具有良好粘接性能的胶黏剂。通过不同测试温度下的剪切强度,差示扫描量热仪(DSC),热失重(TG)以及扫描电子显微镜(SEM)探究了杂化胶黏剂的力学性能、固化行为、耐热性能以及高温下胶黏剂结构的变化。结果表明:酚醛树脂的加入,保持了耐热性能,降低了体系固化的固化温度,有效地提高了磷酸盐胶黏剂对C/C、C/SiC两种复合材料力学性能,室温下剪切强度均高于10MPa。 相似文献
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Liwei Zhao Hongfeng Li Yingjie Qiao Xuefeng Bai Dezhi Wang Chunyan Qu Wanbao Xiao Ye Liu Jian Zhang 《应用聚合物科学杂志》2023,140(6):e53458
Accelerating the curing of epoxy/aromatic amine adhesives and improving their toughness are challenges in heat-resistant epoxy structural adhesives. Herein, we report an epoxy/aromatic amine adhesive accelerated curing system with an oxo-centered trinuclear (chromium III) complex, which is toughened using a thermoplastic block copolymer (TPBC). The reaction characteristics, heat resistance, microstructure, and bonding properties of the accelerated epoxy adhesives were analyzed. The reaction peak temperature of the epoxy with 3% catalyst was 113.1°C, which was 113.6°C lower than that of epoxy without catalyst, and the modified epoxy resin demonstrated a potential for rapid curing at medium temperature. The glass transition temperature of the TPBC-toughened epoxy adhesive was 125°C after curing, indicating excellent thermal stability after medium temperature curing. The introduction of the TPBC increased the single-lap shear strength of the epoxy adhesive without reducing its heat resistance. The shear strength at room temperature and 120°C of the modified epoxy adhesive with 50 phr of TPBC was 25.2 and 10.9 MPa, respectively. Moreover, the epoxy film adhesive exhibited outstanding bonding properties when used in the bonding of lightweight honeycomb sandwich structures. 相似文献
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以正硅酸乙酯(TEOS)为无机前驱体,γ-甲基丙烯酰氧丙基三甲氧基硅烷(KH-570)为偶联剂,HCl为催化剂,采用溶胶-凝胶(Sol-Gel)法制得了硅溶胶,并以此硅溶胶对自制的紫外光固化环氧丙烯酸酯(EA)胶黏剂进行改性。通过傅立叶红外光谱(FT-IR)表征了EA的结构,通过热分析以及力学性能测试表征了此复合胶黏剂的热性能以及力学性能。结果表明:硅溶胶的加入显著地提高了环氧丙烯酸酯胶黏剂的耐高低温性能以及热稳定性,当硅溶胶的固体质量为体系总质量的40%时,复合胶黏剂在-196℃、室温、100℃的拉伸剪切强度分别提高了600%、320%、400%;热分解温度提高了50℃。 相似文献
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用合成的2-(4-氨基苯基)-5-氨基苯并咪唑(APABI)作为环氧树脂固化剂,并与其他固化剂作性能对比。新型固化剂/环氧树脂体系能中温短时(150℃、2h)固化,固化物具有良好的耐热性,初始热分解温度在400℃以上。 相似文献
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Poly epoxy is a high performance room temperature cured epoxy system which provides excellent physical and mechanical properties. However, the effects of post curing of this resin system on the properties of different sandwich structures are unknown. This study aims to evaluate the effect of post curing (at 70°C for 2 hr) on the edgewise compressive and flexural strengths of a sandwich structure, constructed with Styrofoam and honeycomb as core materials and a plain weave carbon fabric as face sheet. Tested factors evaluated from edgewise compressive tests were as follows: peak load, compressive strength, and crash energy absorption of sandwich structures while core shear stress and bending stress of sandwich structures were determined and compared with flexural tests. It was observed that post curing affects significantly on the bending and compressive strengths of the sandwich structures. However, the data obtained for crash energy absorption suggested that the effect of post curing on the core shear strength and the total deflection was statistically insignificant. The matrix polymer was also inspected using dynamic‐mechanical thermal analysis to assess the changes in glass transition temperature and degree of conversion due to post cure. POLYM. COMPOS., 2013. © 2013 Society of Plastics Engineers 相似文献
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以蓖麻油、3,3’-二氯-4,4’-二氨基-二苯基甲烷(MOCA)、填料等为甲组分,蓖麻油、甲苯二异氰酸酯(TDI)合成乙组分,制备了无溶剂型室温固化双组分聚氨酯胶粘剂。考察了甲组分中MOCA含量对胶粘剂固化时间的影响,以及该胶粘剂的甲乙组分质量比、填料品种、硅烷偶联剂及浸水处理对铝合金和硫化天然橡胶胶接性能的影响,并进行热失重分析。结果表明,当MOCA质量分数为甲组分的3%、m甲/m乙为10∶3、填料为400目CaCO3时,铝合金和硫化天然橡胶表面用0.5%的KH-550乙醇溶液处理后,胶接性能和耐水性较好,胶膜的初始热分解温度大于200℃,可以满足高速列车车厢的橡胶地板与铝合金底板的粘结。 相似文献