固化剂对低温固化环氧建筑胶性能的影响

研究了6种不同固化体系在-12～0℃温度下的固化情况,探讨了不同固化剂对胶粘剂固化反应速度、压缩强度及钢一钢拉伸剪切强度的影响。试验结果表明,MS-0021固化剂各项性能优于其他固化剂,其压缩强度值为62．56MPa,钢－钢拉伸剪切强度值为1523MPa,可满足胶粘剂的冬季施工要求。     

一种中温固化高强度环氧胶粘剂的研制

以E-51、E-44为主体树脂,加入奇士增韧剂研制出一种中温固化高强度环氧胶粘剂.该胶粘剂在加入占粘料质量分数30%左右的增韧剂后,选用自制固化剂SL-1,在50 ℃×1 h+80 ℃×1 h条件下固化,其拉伸剪切强度可达42.1 MPa.     

含二氮杂萘酮结构耐热胶粘剂的研究

研究了一种含二氮杂萘酮结构耐热型环氧固化剂，与低分子质量聚酰胺复合使用得到的环氧胶粘剂具有良好的耐热性，固化工艺为140℃／2h 180℃/3h,150℃有25MPa以上的拉伸剪切强度，以及极好的高温保持率，可达到100％。详细研究了表面处理方式和固化工艺对其在常温和150℃下拉伸剪切强度的影响。     

铅酸蓄电池用密封胶的配比对性能的影响

以改性环氧树脂(EP)与改性芳香胺固化剂为原料制备铅酸蓄电池极柱灌封用密封胶,着重研究了改性EP与固化剂的配比对胶粘剂性能的影响。实验结果表明,改性EP与固化剂配比对胶粘剂的初步固化时间、热变形温度、剪切强度和拉伸强度的影响显著;3种配比的胶粘剂耐酸碱性能均较好;当m(改性EP)∶m(固化剂)=100∶50时胶粘剂的综合性能最优,其初步固化时间为6 h、热变形温度为97℃、拉伸强度为72 MPa、剪切强度为3.56 MPa且对ABS的粘接达到材料破坏的程度。该胶粘剂室温固化具有一定的适用期,并具有良好的粘接性能、耐久性能和耐酸性能,可以满足蓄电池极柱灌封和粘接的技术要求。     

新型耐高温无溶剂环氧胶粘剂的研制

采用DTGM53、DDRS3521这2种多官能环氧树脂,以低黏度的甲基四氢苯酐为固化剂,在促进剂E-24作用下,制备了综合性能优异的新型耐高温无溶剂环氧胶粘剂。同时,对该环氧胶粘剂的黏度、凝胶化时间、粘接性能、活化能等作了系统的研究。结果表明,该胶粘剂具有优异的高温拉伸剪切强度,200℃时高达16.1 MPa。     

短切玻璃纤维增强环氧树脂胶粘剂的耐温性能研究

以短切玻璃纤维作为环氧树脂(EP)的增强剂,并以PA650/T31(聚酰胺650/改性胺类曼尼希型固化剂)作为复合固化剂,制备了综合性能良好的胶粘剂。研究结果表明:复合固化剂可有效改善胶粘剂的性能,当m(EP)∶m(PA650)∶m(T31)=10∶4∶2、常温固化时间为18 h时,胶粘剂的拉伸剪切强度相对最大(15.64 MPa);加入1.2%玻璃纤维的胶粘剂在230℃时的拉伸剪切强度提高了32.06%;玻璃纤维增强EP使得胶粘剂的热分解温度提升至300℃,同时热失重率从63.55%下降至56.09%。     

茂铁盐阳离子光引发剂在胶粘剂中的应用

以2种茂铁盐（I-261、I-262）作为阳离子光引发剂,成功在405 nm LED光源下实现了阳离子胶粘剂的固化。选择3种环氧类单体,即双酚A二缩水甘油醚（BADGE）、3,4-环氧环己基甲基-3,4环氧环己基甲酸酯（CE）、3,3’-[氧基双（亚甲基）]双（3-乙基氧杂环丁烷）（DOX）,研究了它们在405 nm LED光源下的光固化动力学,并研究了不同阳离子光引发剂的光引发性能、茂铁盐对不同阳离子单体的引发效率、环氧树脂的热稳定性、阳离子光固化胶粘剂的拉伸剪切性能以及后固化时间对胶粘剂拉伸剪切强度的影响。研究结果表明：确定了茂铁盐作为可见光固化胶粘剂用光引发剂的实用性,在405 nm LED光源下的引发效率均强于碘鎓盐光引发剂I-250。以BADGE作为主要单体,研究了在添加不同含量的CE与DOX形成的光固化胶粘剂的拉伸剪切性能。发现在40%的添加量下,混入CE与DOX的胶粘剂比BADGE本体聚合而成的胶粘剂的拉伸剪切强度分别提高了2.19倍与1.38倍,并且后固化时间的增加能够大幅提升胶粘剂的拉伸剪切强度。本研究为可见光固化的阳离子胶粘剂提供了一种切实可行的方法。     

无溶剂耐高温BAPP型环氧胶粘剂的制备与性能研究

采用多官能环氧树脂(JP-80)、2,2-双[4-(4-氨基苯氧基)苯基]丙烷(BAPP)、环氧活性稀释剂(CE-793-250)、固化剂和促进剂,制得了无溶剂耐高温BAPP型环氧胶粘剂,并对其黏度、凝胶化时间、表观活化能、拉伸剪切强度、电容、介电损耗、接触角、表面能和吸水性等性能进行了研究。结果表明:该胶粘剂具有良好的施胶工艺性和固化反应活性,以及优异的粘接强度,240℃时的拉伸剪切强度高达25.6 MPa;在宽广的频率范围内(20 Hz~1 MHz),其电容值较稳定,且介电损耗较低,具有优异的介电性能、较低的表面能(6 4.4 mJ/m~2)和吸水性(0.87%)。     

改性脂环胺固化剂在陶瓷膜端面封胶中的应用

以聚酰胺651及自制的M6640改性脂环胺为固化剂分别与环氧树脂E-51配制成管式陶瓷膜表面封端用胶粘剂,通过示差扫描分析法(DSC)、胶粘剂力学性能及腐蚀液的化学需氧量(COD)测试,考察了环氧固化剂种类、M6640改性脂环胺与环氧树脂E-51的质量比、固化条件对环氧胶粘剂的力学性能及耐碱性等的影响。结果表明,m(M6640改性脂环胺):m(环氧E-51)=50:100,固化条件25℃/24 h+80℃/4 h时,胶的剪切强度17.49 MPa、拉伸强度78.72 MPa、压缩强度105.32 MPa、弯曲强度120.58 MPa、硬度90.5 HD,Tg65.3℃,耐碱腐蚀,可满足陶瓷膜端面胶的应用要求。     

一种低成本室温固化双组分环氧密封胶的研制

采用低分子质量双酚A型环氧树脂及改性胺类固化剂研制了一种低成本室温固化双组分环氧胶粘剂。探讨了其固化机理,考查了温度、配比对适用期的影响,以及硅微粉、邻苯二甲酸二辛酯的用量对胶接强度的影响。结果表明,温度变化对该产品的适用期影响较大。温度升高,适用期变短。硅微粉加入量在30~75份时,胶的湿润性变差,固化后的胶层缺陷增多,拉伸剪切强度随硅微粉用量的增大而下降。邻苯二甲酸二辛酯的加入降低固化后的交联密度,使环氧胶的胶接强度下降。     

Tensile Strength of Joints Bonded With a Nano-particle-Reinforced Adhesive

In order to improve the tensile lap shear strength of adhesively bonded joints, nano-particles were dispersed in the adhesive using a 3-roll mill. The dispersion states of nano-particles in the epoxy adhesive were observed with TEM (Transmission Electron Microscopy) with respect to the mixing conditions, and the effect of nano-particles on the mechanical properties of the adhesive was measured with respect to dispersion state and weight content of nano-particles. Also the static tensile load capability of the adhesively bonded double lap joints composed of uni-directional glass/epoxy composite and nano-particle-reinforced epoxy adhesive was investigated to assess the effect of nano-particles on the lap shear strength of the joint. From the experimental and FE analysis results, it was found that the nano-particles in the adhesive improved the mechanical properties of the adhesive. Also the increased failure strain and the reduced CTE (coefficient of thermal expansion) of the nano-particle-reinforced adhesive improved the lap shear strength of adhesively bonded joints.     

弹性环氧建筑结构胶粘剂的研究

采用酸碱催化剂催化合成糠叉丙酮改性环氧树脂 ,改性后的环氧树脂经胺固化后都具有良好的应力 应变关系 ,碱法抗压强度达 72 .4MPa ,拉伸强度 16 .5MPa,剪切强度 13.8MPa ,压缩弹性模量 1.40× 10 3MPa和超过 7.0MPa的拉伸粘接强度 ;酸法抗压强度可达 86 .2MPa ,压缩弹性模量为 9.2 3× 10 2 MPa。酸催化合成的糠叉丙酮改性环氧树脂具有储存时间长、反应易控制及成本较低的优点。     

Comparison of fracture behavior between acrylic and epoxy adhesives

An experimental study was conducted on the strength of adhesively bonded steel joints, prepared epoxy and acrylic adhesives. At first, to obtain strength characteristics of these adhesives under uniform stress distributions in the adhesive layer, tensile tests for butt, scarf and torsional test for butt joints with thin-wall tube were conducted. Based on the above strength data, the fracture envelope in the normal stress-shear stress plane for the acrylic adhesive was compared with that for the epoxy adhesive. Furthermore, for the epoxy and acrylic adhesives, the effect of stress triaxiality parameter on the failure stress was also investigated. From those comparison, it was found that the effect of stress tri-axiality in the adhesive layer on the joint strength with the epoxy adhesive differed from that with the acrylic adhesive. Fracture toughness tests were then conducted under mode l loading using double cantilever beam (DCB) specimens with the epoxy and acrylic adhesives. The results of the fracture toughness tests revealed continuous crack propagation for the acrylic adhesive, whereas stick-slip type propagation for the epoxy one. Finally, lap shear tests were conducted using lap joints bonded by the epoxy and acrylic adhesives with several lap lengths. The results of the lap shear tests indicated that the shear strength with the epoxy adhesive rapidly decreases with increasing lap length, whereas the shear strength with the acrylic adhesive decreases gently with increasing the lap length.     

F-992抗蠕变光学结构胶

以改性环氧树脂为主粘料,用反应性端羧基丁腈橡胶（CTBN）为增韧剂,与改性多元胺端氨基聚醚固化剂配制成具有较高交联密度的光学结构胶。因较高的交联密度和使用耐热改性剂,提高了耐热性;CTBN与环氧树脂进行预反应,并加入气相法白炭黑,提高了胶液的贮存稳定性和粘接强度。制备的光学结构胶拉伸剪切强度15．7MPa,压缩剪切强度25．4MPa,常温条件下蠕变值小于2英寸,表现出良好的粘接强度和耐热、耐冲击振动及抗蠕变性。     

聚氨酯改性室温固化环氧结构胶粘剂的研究

采用聚氨酯预聚体改性环氧树脂,制备了高性能室温固化环氧结构胶粘剂,研究了聚氨酯预聚体加入量对环氧结构胶剪切强度、冲击强度和拉伸强度等指标的影响,利用扫描电镜(SEM)对环氧胶固化物的冲击断裂面进行了分析。结果表明,聚氨酯预聚体的加入可显著提高环氧胶粘剂的韧性。采用NCO质量分数为3.86%的甲苯二异氰酸酯/聚醚多元醇预聚体(TDI/N220)改性环氧树脂,加入量为20 g/(100 g环氧树脂)时,环氧结构胶粘剂的综合性能最佳,剪切强度为20.8 MPa,冲击强度为44.2 kJ/m2,拉伸强度为17.4 MPa。     

纳米蒙脱土/环氧树脂胶粘剂最佳组分的优化选择

将有机化处理后的蒙脱土作为填料，通过插层复合的方法制备出纳米蒙脱土／环氧树脂胶粘剂，进行了拉伸强度、硬度及XRD测试，并与粉煤灰、未处理蒙脱土作填料的环氧胶粘剂进行了性能对比。，试验结果表明，当加入质量分数5％的有机蒙脱土时，环氧胶粘剂的剪切强度达到21．6MPa；X射线衍射结果表明，用该法制得的胶粘涂层内部蒙脱土片层已被剥离，属于纳米复合胶粘剂；通过对比力学性能及密度，加入有机蒙脱土的环氧树脂胶粘剂涂层综合性能要优于一般环氧树脂胶粘剂。     

硅溶胶改性紫外光固化环氧丙烯酸酯胶黏剂的研究

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℃。     

聚氨酯改性环氧树脂粘合剂

本文用端异氰酸酯其聚氨酯预聚体与环氧树脂Ｆ－４４复合，得到了一种性能优异的改性环氧树脂合剂，粘接试样的剪切强度，不均匀扯离强度以及浇铸体的抗冲击强度，弯曲强度和拉伸强度数据表明：聚氨酯分子量及用量或固化体系不同，粘合剂的粘接性能，机械强度尤其进韧性均比纯Ｆ－４４有显著提高。     

端环氧基液体丁腈橡胶改性环氧树脂结构胶的研究

采用ETBN(端环氧基液体丁腈橡胶)增韧EP(环氧树脂),制备了单组分EP结构胶。利用红外光谱(FT-IR)、扫描电镜(SEM)等手段对结构胶的拉伸剪切强度及微观结构进行了表征。结果表明:制备该结构胶的适宜条件为m(EP):m(ETBN)=20:3,80℃均匀搅拌20 min,130℃固化1 h;由该结构胶制成的钢-钢胶接件,其室温拉伸剪切强度为23.66 MPa,并且其耐介质性能良好,说明ETBN对EP的增韧效果较好。     

Glass/epoxy composites and aluminium alloy joint using Kevlar® intermediate layer and nanoclay-reinforced epoxy adhesive

Adhesive lap joint between glass fibre/epoxy composites and aluminium alloy (2014 T4) was prepared by an in situ moulding process using a matched die mould. The surface of aluminium alloy was treated with chromic acid before adhesive bonding. Lap shear strength and fatigue life were evaluated in tensile mode and tension–compression mode (at 40% of lap shear load of adhesive joint), respectively. Knurling on the surface of aluminium alloy improved the lap shear strength of the adhesive joint but did not influence the fatigue life of the same. Lap shear strength and fatigue life of adhesive joint made with neat epoxy adhesive and reinforcement of an intermediate layer of Kevlar^® between glass/epoxy composite and aluminium alloy were observed to be 0.44?kg/mm² and 3.6?×?10⁵ cycles, respectively. In another case, lap shear strength and fatigue life of similar type of adhesive joint made from nanoclay (Cloisite 30B)-reinforced epoxy adhesive and without reinforcement of an intermediate layer of Kevlar^® were observed to be 0.38?kg/mm² and 2.3?×?10⁵ cycles, respectively. Whereas, lap shear strength and fatigue life of adhesive joint made from nanoclay-reinforced epoxy adhesive along with the reinforcement of an intermediate layer of Kevlar^® were 0.48?kg/mm² and 3.9?×?10⁵ cycles, respectively. Therefore, adhesive joint made from nanoclay-reinforced epoxy adhesive along with the reinforcement of an intermediate layer of Kevlar^® was the best.