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以二乙醇胺、丙烯酸甲酯、三羟甲基丙烷以及环氧氯丙烷为原料,合成不同代数的端环氧基超支化聚(胺-酯)(EHPAE)。其后,以从制革废弃物中提取的明胶为原料,不同代数的EHPAE分别作为交联单体进行改性,制得一种环保型鞋用或包袋用胶粘剂。采用FTIR、1HNMR和GPC对超支化聚合物和胶粘剂的结构及相对分子质量分布进行表征,之后对胶粘剂的粘结性能进行测定,结果表明:EHPAE-Ⅲ较其余两者的改性效果更为明显,当EHPAE-Ⅲ用量为明胶质量的30%时,改性后胶粘剂的固含量由11.42%提高到了30.33%,同时剪切强度为2.216 MPa、T-剥离强度为3.375 N/mm、水接触角为100.9°,相较于市售胶粘剂的剪切强度(1.868 MPa)、T-剥离强度(2.864 N/mm)、水接触角(84.8°),制备得到胶粘剂的粘结性能和疏水性均更优。 相似文献
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《中国胶粘剂》2021,(9)
以聚酯多元醇和甲苯-2,4-二异氰酸酯(TDI)合成了—NCO封端的聚氨酯预聚物,然后与环氧树脂反应,得到聚氨酯改性环氧树脂(PU/EP),并用PU/EP为原料制备了改性环氧树脂胶粘剂。采用傅里叶变换红外光谱仪(FT-IR)对聚氨酯改性环氧树脂进行了表征,考察了PU含量对改性环氧胶粘剂的剪切强度、剥离强度、硬度及耐热性的影响,分析了PU含量对改性环氧胶粘剂外观和微观形貌的影响。研究结果表明:当w(PU)=20%(相对于总质量而言)时,改性环氧胶粘剂的粘接性能达到最佳:剪切强度为29.9 MPa,比改性前提高27%;剥离强度为4.56 N/mm,比改性前提高251%;但是硬度和玻璃化转变温度(Tg)降低,硬度为73.4,Tg为59.69℃。 相似文献
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《粘接》2018,(11)
在硅烷改性聚醚(MS)聚合物中添加不同比例(10%、25%、40%、50%、60%、75%和100%)的环氧树脂(E-51)及固化剂,制备出一系列E-51改性MS双组分弹性胶粘剂,并利用万能材料试验机对固化产物进行性能测试。结果表明,当E-51添加量为50g(100 g硅烷改性聚醚中的加入量)时,E-51/MS弹性胶粘剂固化后的力学强度达到相对最大值,硬度为50A、拉伸强度为5.5 MPa、断裂伸长率为410%、剪切强度为6.0 MPa和剥离强度为7.4 N/mm。且选用分子质量更大的E-44(环氧树脂)制得的E-44/MS胶粘剂的力学性能和粘接性能更优异。 相似文献
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室温固化耐热150度环氧树脂结构胶粘剂 总被引:3,自引:1,他引:2
介绍了一种以液体端羧基丁腈橡胶(CTBN)改性环氧树脂为主体,改性聚硫橡胶为固化剂的结构胶粘剂,该胶强度高,韧性好,室温固化10d,室温剪切强度23.6MPa,150℃剪切强度为13.3MPa,200摄氏度剪切强度为5.6MPa,室温剥离强度6.0kN.m^-1,综合性能优异,用于,航天工业耐热结构部件的粘接。 相似文献
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《Journal of Adhesion Science and Technology》2013,27(11):1487-1500
The effect of surface treatment of aluminum on the bonding characteristics of aluminum- CFRP (carbon fiber reinforced plastic) composite joints has been investigated. The surface of the aluminum panel was treated by DC plasma. The plasma treatment was carried out at different treatment times and volume ratios of acetylene gas to nitrogen gas. The volume ratios used were 1 : 9, 3 : 7, 5 : 5, 7 : 3, and 9 : 1. The treatment times used were 10, 20, 30, 40, 50, and 60 s. Optimal plasma treatment conditions were determined by measuring the T-peel strength and water contact angle as functions of the treatment time and gas volume ratio. Single lap shear tests and T-peel tests were performed using plasma-treated aluminum-CFRP composite joints and regular aluminum-CFRP composite joints to determine the effect of treatment on the shear strength and T-peel strength. The results showed that the water contact angle was minimum and the peel strength was maximized when the aluminum was plasma-treated for 30 s at a volume ratio of 5 : 5. The shear strength of aluminum-CFRP composite joints plasma-treated under the optimal treatment conditions was 33% higher than that of regular aluminum-CFRP composite joints. The T-peel strength of plasma-treated aluminum-CFRP composite joints was almost six times larger than that of regular aluminum-CFRP composite joints. SEM examination showed that the improvement in bond strength was attributed to a uniform spread of the epoxy adhesive due to the surface energy increase of aluminum and this resulted in a cohesive failure of the epoxy adhesive. 相似文献
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For improvement of adhesive strength and durability of adhesion between epoxy and aluminium sheet bis-(triethoxysilylpropyl)tetrasulfide (BTESPT) silane and maleic anhydride grafted polypropylene (PP-g-MAH) are chosen for surface pretreatment of the aluminium sheet respectively. Fourier transform infrared (FTIR) spectroscopy was used for characterization of the structure and the interactions in the systems. It is shown that BTESPT silane and the anhydride on PP-g-MAH take part in the curing reactions of the epoxy/polyamide system. The adhesive shear strength of the samples, prepared under different curing temperatures, and after immersion in boiling water and 3.5% NaCl water solution respectively, was tested. The features of the shear fractured surfaces were examined by scanning electron microscope (SEM). For the aluminium sheet pretreated by BTESPT silane, the maximum adhesive shear strength is 22.2 MPa, which is higher than that of 17.5 MPa for aluminium sheet without pretreatment by the silane. After immersion in boiling water for 80 h and in NaCl water solution at 50 °C for 180 h the adhesive shear strengths are 13.39 MPa and 18.4 MPa respectively, which are higher than these (below 6 MPa) for aluminium sheet without pretreatment by the silane. As for the aluminium sheet pretreated by PP-g-MAH, the maximum adhesive shear strength is 13.17 MPa. After immersion in boiling water for 80 h and in NaCl water solution at 50 °C for 180 h the adhesive shear strengths decline to 10.67 MPa and 8.1 MPa respectively. 相似文献
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《Journal of Adhesion Science and Technology》2013,27(1):101-110
Adhesive characteristics of blends of a room-temperature-curing epoxy and a dendritic hyperbranched polymer (HBP) were investigated. Significant improvements in both lap shear and T-peel strengths were observed as a result of blending of HBP. Dynamic mechanical analysis of the cured blend formulations indicates a two-phase microstructure. The improvement in adhesive bond strength is achieved without significant sacrifice in glass-transition temperature of the cured epoxy network. The results were explained in terms of phase morphology analyzed by scanning electron microscopy. Cavitation and shear yielding are believed to be responsible for improvement in toughness and adhesive bond strength. 相似文献
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有机硅硼改性环氧树脂胶粘剂的研制 总被引:6,自引:1,他引:5
以环氧树脂(EP)和有机硅硼改性EP预聚物为主体材料,研制出一种可室温固化、高温使用且固化压力仅为接触压力的胶粘剂。并通过SEM、热重分析法和力学性能测试等手段对该胶粘剂的性能进行了研究。实验结果表明,有机硅硼改性EP预聚物与纯EP相容性很好,有机硅硼的加入明显提高了EP的韧性、耐热性和力学性能(尤其是高温时的剪切强度);当m(EP)∶m(有机硅硼改性EP预聚物)=100∶40时,剪切强度为14.84 MPa(20℃)和4.88 MPa(100℃),与未改性前相比,高温时的强度损失率由改性前的81.0%降低至67.1%;该胶粘剂可在100℃时长期使用,短期可耐150℃的高温。 相似文献
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Adhesion properties of soy protein with fiber cardboard 总被引:19,自引:0,他引:19
Zhikai Zhong X. Susan Sun Xiaohua Fang Jo A. Ratto 《Journal of the American Oil Chemists' Society》2001,78(1):37-41
Adhesion properties of soy protein isolate (SPI) on fiber cardboard and effects of press conditions, pre-pressing drying time,
and protein concentrations on gluing strength were investigated. Shear strength increased as press time, press pressure, and/or
press temperature increased. The effect of temperature on shear strength became more significant at high press pressure. The
shear strength of the SPI adhesive on fiber cardboard decreased by 12–25% after water soaking. Shear strength increased as
pre-pressing drying time increased and reached its maximal value at about 10 min. An SPI/water ratio of 12∶100 (w/w) gave
the highest gluing strength. The specimens showed complete cohesive failure (fiber cardboard failure) except for soaked specimens
pressed at low press temperature, low pressure, and short press time. Specimens pressed at 25°C and 2 MPa for 5 min with pre-pressing
drying time of 10 min and an SPI/water ratio of 12∶100 (w/w) had T-peel strength and tensile bonding strength of 1.15 N/mm
and 0.62 MPa, respectively, without water soaking, and 1.11 N/mm and 0.24 MPa, respectively, with water soaking. 相似文献
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以聚己二酸新戊二醇酯(PNA)、二聚酸聚酯多元醇(BY3026)、异佛尔酮二异氰酸酯(IPDI)为主要原料制备了一系列侧链含长链烷基的水性聚氨酯(WPU)乳液并制成胶膜。通过FTIR、DSC表征了胶膜的结构和热性能,测试了乳液粒径及胶膜的力学性能、吸水率、接触角以及其在双向拉伸聚丙烯薄膜(BOPP)上的附着力。结果表明,当m(BY3026)∶m(PNA)从0∶1增加到3∶5,WPU乳液粒径增大,胶膜的耐水性增强,表面能先减小后增大,拉伸强度和断裂伸长率从52.6 MPa和2607.2%分别降低至38.7 MPa和1911.2%。当m(BY3026)∶m(PNA)=2∶5时,制备的WPU胶膜表面能为35.43mJ/m2,WPU乳液在BOPP薄膜上的T-剥离强度为2.98 N/25 mm。 相似文献
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The correlation between the adhesive strength of joints of aluminum alloys and the wettability of their surfaces was studied. Two alloys, Al-1100 and Al-2024, were used, with two commercial epoxy adhesives, FM-73 and FM-300K, and the BR-127 primer. The wettability of the surfaces was modified by applying coatings of silicone oil and stearic acid at various concentrations. Wettability was characterized by the “complete spreading concentration” (CSC) method and by advancing contact angles. The CSC method was proven to be more reliable than contact angle measurements in detecting variations in the surface energy of the aluminum alloys studied. The adhesive strength was measured by the lap shear strength (LSS) and by the T-peel strength. The adhesive strength is only mildly sensitive to the concentration of silicone oil for the two adhesive systems. For FM-300K, the LSS decreases when the concentration of stearic acid in the coating increases. For FM-73, the LSS is only mildly sensitive to the concentration of stearic acid, but the T-peel strength shows appreciable sensitivity. The failure mode becomes more adhesive as the concentration of stearic acid and thereby the CSC increase. It is only mildly dependent on the concentration of silicone oil. The results indicate that silicone oil probably interacts with either the primer or an adhesive component in a way which counteracts the expected decrease in adhesive strength due to the reduction in surface energy and wettability of the adherends. However, the effect of stearic acid on the adhesive strength is associated with decreased wettability. All cases for which a pronounced decrease in the adhesive strength was measured are associated with contact angles larger than 90° and with either high CSC values or nonspreading situations. 相似文献
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The correlation between the adhesive strength of joints of aluminum alloys and the wettability of their surfaces was studied. Two alloys, Al-1100 and Al-2024, were used, with two commercial epoxy adhesives, FM-73 and FM-300K, and the BR-127 primer. The wettability of the surfaces was modified by applying coatings of silicone oil and stearic acid at various concentrations. Wettability was characterized by the “complete spreading concentration” (CSC) method and by advancing contact angles. The CSC method was proven to be more reliable than contact angle measurements in detecting variations in the surface energy of the aluminum alloys studied. The adhesive strength was measured by the lap shear strength (LSS) and by the T-peel strength. The adhesive strength is only mildly sensitive to the concentration of silicone oil for the two adhesive systems. For FM-300K, the LSS decreases when the concentration of stearic acid in the coating increases. For FM-73, the LSS is only mildly sensitive to the concentration of stearic acid, but the T-peel strength shows appreciable sensitivity. The failure mode becomes more adhesive as the concentration of stearic acid and thereby the CSC increase. It is only mildly dependent on the concentration of silicone oil. The results indicate that silicone oil probably interacts with either the primer or an adhesive component in a way which counteracts the expected decrease in adhesive strength due to the reduction in surface energy and wettability of the adherends. However, the effect of stearic acid on the adhesive strength is associated with decreased wettability. All cases for which a pronounced decrease in the adhesive strength was measured are associated with contact angles larger than 90° and with either high CSC values or nonspreading situations. 相似文献
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以苯并噁嗪(BZ)作为氰酸酯(CE)-环氧树脂(EP)-双马来酰亚胺(BMI)基胶粘剂的改性剂,探讨了BZ含量对改性胶粘剂的力学性能、介电性能、耐热性、耐水性和可操作性等影响。结果表明:当w(BZ)=2%时,改性胶粘剂的综合性能较好,其常温剪切强度(24.98 MPa)和高温(200℃)剪切强度(21.24 MPa)分别比未改性胶粘剂提高了16.9%和32.7%、介电系数低于3.0、吸水25 h后的吸水率仍低于1.2%且耐热性能未受到影响;170℃时凝胶时间为71 min,说明改性胶粘剂的可操作性较强,并且满足使用期的要求;改性胶粘剂在电子电器行业中具有良好的应用前景。 相似文献