超声加速环氧胶黏剂的固化动力学行为与机理

超声可显著提高胶黏剂的固化速率,加快胶接成型。采用双酚A型环氧树脂/低分子聚酰胺650体系胶黏剂树脂,以碳纤维增强复合材料(CFRP)/铝合金接头为黏接对象,通过超声工具头对接头中的CFRP板施加超声振动。通过差式扫描量热法(DSC)分析固化过程,证实对胶接接头施加超声振动可使胶黏剂的固化速率较常温固化提高26倍。通过监测振动过程中胶黏剂的温度变化,表明超声能够促进胶黏剂升温,有利于加速固化反应。对固化动力学方程进行变换,结合温度数据,建立超声辅助固化的变活化能模型,表明超声可显著降低固化反应活化能。通过傅里叶变换红外光谱(FTIR)分析发现超声可使环氧键、N—H键活化,提高反应活性。     

无溶剂封口胶LZ—9701的研制

采用双酚Ａ型环氧树脂ＣＹＤ－１２８及高活性聚酰胺作为固化体系，配制成一种复合材料金属喷涂表面密封用无溶剂封口胶ＬＺ－９７０１，并研究了固化工艺及性能。     

一种高弹性改性环氧道路修补胶的研制

通过添加合适的增韧剂对双酚A环氧树脂进行改性,得到改性环氧树脂;同时筛选合适的韧性固化剂,固化得到高弹性道路修补胶。     

国内外近期有关胶黏剂文献的增注题录

07-045纳米填料对用于木材粘结的双酚A型环氧树脂胶黏剂的热力学性能和机械性能的影响[系统研究了和不同的聚醚胺交联、以及添加了不同的填料得到室温固化环氧胶黏剂(双酚A缩水甘油醚,DGEBA)的热力学性能和机械性能。填充料包括纳米二氧化硅、液体橡胶(CT-BN)和粘土等。纳米二氧化硅和液体橡胶可以增加胶黏剂体系的挠曲强度和弹性模量;添加了粘土粒子,可以显著增加胶黏剂的弹性模量,但却使胶黏剂变脆。因此在对木材进行结构粘接的时侯,确定一个合适的固化时间是十分重要的,因为固化时间影响粘结强度。本文对固化时间对挠曲强度的影响进…     

专利介绍

<正>机器人堵漏用胶粘剂 CN 1618912(2005-05-25)。该固化胶为双组分,其中甲组分为双酚A、双酚F环氧树脂和711环氧树脂的混配物;乙组分为三氟化硼络合物、固化促进剂、偶联剂、触变剂为主的混配物;且两组分质量比为60-80:20-40,该堵漏剂配胶简单、原料易     

环氧树脂/低分子聚酰胺体系的固化反应特性及胶接强度

双酚A型环氧树脂/低分子聚酰胺体系是应用很广的室温固化胶粘剂。但是研究表明,这种胶粘剂在室温下的固化反应是不完全的,胶接强度和耐热性都较低。只有提高固化温度,才能获得较高的胶接强度和耐热性。这说明,环氧树脂/聚酰胺胶粘剂的胶接强度与其固化反应特性有密切的关     

中国专利

有机胶粘剂ＣＮ１０７７２１０Ａ（１９９３．１０．１３），航空航天工业部南方动力机械公司。胶特别适用于车辆白炽灯铝制灯头与集胶盘之间的胶接。胶由双酚Ａ环氧树脂及固化成分构成，固化成分含乙烯二胺缩合物、含芳核的有机物，硅烷及酸类促进剂。固化条件１４０～１８０℃４５分钟，接头抗剪强度＞１０ＭＰａ，成品在１５０℃下能可靠工作。淀粉冷配快速氧化法及其生产的粘合剂ＣＮ１０７７４５８Ａ．（１９９３．１０．２０），江学艺（广西）。淀粉加水配成悬浊液后，在碱性条件下进行糊化处理，再在充足光照条件下进行氧化处理，氧…     

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。     

无溶剂浸胶制备玻纤布半固化片工艺研究

以双酚A型环氧树脂和邻甲酚醛环氧树脂复配作为基体树脂,双氰胺为固化剂,咪唑2E4MZ为促进剂,无溶剂法浸胶制备玻纤布半固化片。探讨了基体树脂和促进剂对半固化制备工艺的影响,着重研究了无溶剂法玻纤布浸胶工艺和半固化片制备工艺。研究结果表明:当w(双酚A型环氧)=15%、w(酚醛环氧704)=75%、w(双氰胺)=10%(相对于浸胶总质量而言),w(2E4MZ)=6%(相对于双氰胺质量而言),涂布机温度为110℃下浸胶可达到完全浸润玻纤布;半固化工艺为130℃/9 min时,可得到具有高的分解温度(360℃)、玻璃化转变温度(165℃),耐浸焊性时间长(242 s),击穿电压(46 kV)、介电常数(4.35)、剥离强度(1.45 N/mm)优异的玻纤布半固化片覆铜板。     

一种汽车顶灯罩异物的成分分析研究

本文通过傅里叶红外光谱仪、热裂解-气质联用仪对异物进行直接定性分析，并利用溶剂萃取方式结合气质联用仪对异物的甲醇萃取液进行了定性分析。综合分析结果表明，该异物主要含有双酚A、环氧树脂、磷酸三（1-氯-2-丙基）酯阻燃剂，以及少量邻苯二甲酸酯增塑剂，异物成分表明主要来源于环氧树脂胶黏剂。建议对灯罩周围使用的环氧树脂胶黏剂或固化工艺进行改进，避免异物再产生。     

双酚S型EP的制备及其复合体系粘接性能的研究

以双酚S单体、ECH(环氧氯丙烷)为原料,在碱性条件下制得双酚S型EP(环氧树脂);然后以双酚S型EP/双酚A型EP作为复合EP,采用柔性固化剂制得复合EP胶粘剂。研究结果表明:当固化剂为D230时,复合EP胶粘剂的剪切强度相对最大;以复合EP胶粘剂胶接不同基材,则相应胶接件的剪切强度随双酚S型EP或D230含量增加均呈先升后降态势,并且在w(D230)=40%、w(双酚S型EP)=30%(相对于总树脂质量而言)时相对最大。     

水溶性双酚A型酚醛树脂固化剂的制备及应用

在碱性催化剂(B-Cat)作用下,利用双酚A(A)、甲醛水溶液(F)为原料,合成了一种新型丙烯酸酯乳液胶用水溶性双酚A型酚醛树脂固化剂。研究了催化剂种类及用量、反应时间、反应温度、投料方式和投料比对产物合成的影响,并用红外光谱分析了产品的结构。结果表明,最佳工艺条件为:n(F)/n(A)=3.8~4.2;n(B-Cat)/n(A)=0.37;反应温度70~80℃;反应时间6 h。用此法合成的产物固含量高,水溶性好,贮存期长。用其固化丙烯酸酯乳液胶制得了聚酰亚胺挠性覆铜板(FCCL)样品,并测试和比较了所得样品的相关性能。     

Novel rapid‐cure adhesives for low temperature using thiirane compound

We investigated improvement of workability (viscosity), storage stability, and curing ability of thiirane resin for adhesive applications. The viscosity of bisphenol‐F thiirane resin was lower than that of bisphenol‐A thiirane resin, especially at low temperatures, thus improving ease of handling. Addition of diphenyl decyl phosphite improved its storage stability to a level similar to that of bisphenol‐A epoxy resin. The curing of bisphenol‐F thiirane resin increased three times faster by adding 2,4,6‐tris(dimethylaminomethyl)phenol (DMP‐30) as a tertiary amine. In applications of this new thiirane resin as civil and architectural adhesives, a superior curing ability at low temperature was attained. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 2953–2957, 2001     

EFFECT OF A REACTIVE INTERFACIAL AGENT ON THE PROPERTIES OF A NITRILE-RUBBER-MODIFIED EPOXY FILM ADHESIVE

Reactive interfacial agents are often used to homogenise the morphology of immiscible polymer blends and to improve the level of adhesion between the phases to achieve enhanced properties. This paper demonstrates the ability of hydroxyl methyl bisphenol A (HMBPA) to function as a reactive interfacial agent (compartibilizer) in a nitrile-epoxy film adhesive made from nitrile rubber (NBR) and solid epoxy resin blend. The curing of the adhesive film was achieved at 170° C by adding dicyandiamide, a latent curing agent for epoxy resin, and rubber vulcanising agents. Hydroxyl methyl bisphenol A resins with different hydroxyl methyl content, synthesised by the base-catalysed reaction of bisphenol A and formaldehyde in various mole ratios, were used to compatibilize a blend of nitrile rubber (NBR) and epoxy resin 50/50wt/wt. The effect of addition of HMBPA on the morphology, adhesive, thermal, and mechanical properties of the adhesive film was investigated. The nitrile-epoxy adhesive films were characterised by measurements of adhesive joint strength, stress-strain properties, DSC, TGA, TMA, DMA, and SEM. Results revealed that significant improvement in joint strength occurred at low levels of HMBPA, and the optimum strength was obtained at about 15 wt% of HMBPA in the blend. The hydroxyl methyl content in HMBPA was found to influence the properties of the adhesive film. The concept of strengthening the interphase between NBR and epoxy through the coupling reactions of HMBPA was used for interpreting the results. The effect of addition of silica, alumina, and aluminium fillers on the properties of the nitrile-epoxy adhesive film was also studied, and a comparison of properties with and without HMBPA is presented.     

Effect of a reactive interfacial agent on the properties of a nitrile-rubber-modified epoxy film adhesive

Reactive interfacial agents are often used to homogenise the morphology of immiscible polymer blends and to improve the level of adhesion between the phases to achieve enhanced properties. This paper demonstrates the ability of hydroxyl methyl bisphenol A (HMBPA) to function as a reactive interfacial agent (compartibilizer) in a nitrile-epoxy film adhesive made from nitrile rubber (NBR) and solid epoxy resin blend. The curing of the adhesive film was achieved at 170° C by adding dicyandiamide, a latent curing agent for epoxy resin, and rubber vulcanising agents. Hydroxyl methyl bisphenol A resins with different hydroxyl methyl content, synthesised by the base-catalysed reaction of bisphenol A and formaldehyde in various mole ratios, were used to compatibilize a blend of nitrile rubber (NBR) and epoxy resin 50/50wt/wt. The effect of addition of HMBPA on the morphology, adhesive, thermal, and mechanical properties of the adhesive film was investigated. The nitrile-epoxy adhesive films were characterised by measurements of adhesive joint strength, stress-strain properties, DSC, TGA, TMA, DMA, and SEM. Results revealed that significant improvement in joint strength occurred at low levels of HMBPA, and the optimum strength was obtained at about 15 wt% of HMBPA in the blend. The hydroxyl methyl content in HMBPA was found to influence the properties of the adhesive film. The concept of strengthening the interphase between NBR and epoxy through the coupling reactions of HMBPA was used for interpreting the results. The effect of addition of silica, alumina, and aluminium fillers on the properties of the nitrile-epoxy adhesive film was also studied, and a comparison of properties with and without HMBPA is presented.     

双酚A型环氧树脂胶粘剂的合成及配制

以苯酚与丙酮为原料,以硫酸为催化剂,在助催化剂甲苯的作用下合成了2,2-二羟苯基丙烷,即双酚A.研究了硫酸的滴加速度、助催化剂甲苯的用量、反应温度、反应时间对双酚A收率的影响,并得出最佳的反应条件为:硫酸约每min 13滴,甲苯与苯酚质量比为1:4,反应时间为2h,反应温度为35℃.收率为22.78％.双酚A的熔点为1...     

微波涂层用环氧树脂的固化剂研究

合成了不同分子量的端胺基聚氨酯作为固化剂改性双酚Ａ 环氧树脂, 并用作吸波涂层（ＲＡＣ） 胶粘剂, 研究了该固化剂对胶粘剂的柔韧性、附着力、剥离强度等性能的影响。结果表明： 用具有适当分子量的端胺基聚氨酯固化剂改性环氧树脂得到的ＲＡＣ 胶粘剂, 不仅其柔韧性得到大大改善, 其他性能也可满足飞行器的使用要求。     

盐雾条件下氟橡胶与金属粘接用胶粘剂的研究

通过对几种不同类型的氟橡胶胶粘剂在常规和盐雾条件下的试验对比,发现双酚AF/BPP硫化体系的氟橡胶与金属骨架的粘接性能中,树脂类胶粘剂在盐雾条件下的防锈性能明显优于其他类型的胶粘剂。批量生产验证表明,树脂类胶粘剂在盐雾24 h条件下,粘接性能变化率最小,仅为2.29%,外观颜色为浅绿色,表面均匀度好。     

含氮杂环二胺固化双酚F环氧胶粘剂的研究

以1,2-二氢-2-(4-氨基苯基)-4-[4-(4-氨基苯氧基)-苯基]-二氮杂萘-1-酮(DHPZ-DA)为固化剂,采用示差扫描量热法(DSC),TGA,红外光谱及剪切强度测试研究了双酚F环氧树脂/DHPZ-DA粘接体系固化行为及耐热性。由Kissinger和Ozawa方法计算得到固化体系的表观活化能分别为80.1 kJ/mol和84.3kJ/mol。由Crane方程求得的表观反应级数为0.93。该胶粘剂体系Tg>200℃,当双酚F环氧树脂与DHPZ-DA固化剂的物质的量比为10∶4时,其室温剪切强度与150℃老化24 h后的剪切强度均大于12 MPa,表现出良好的耐热性。     

Mechanical properties of cryogenic epoxy adhesives: Effects of mixed curing agent content

Phenyl glycidyl ether was used to react with solid metaphenylene diamine (MPDA) to produce N-(3-phenoxy-2-hydroxypropyl)-1,3-benzenediamine (NPHB). MPDA was intentionally formulated to have an excessive amount to obtain a new liquid MPDA–NPHB mixture. The mixed curing agent was indicated to have a few advantages over MPDA. The mixed curing agent was then used to cure diglycidyl ether of bisphenol A as cryogenic epoxy adhesive. The effects of the MPDA–NPHB content were systematically studied on the impact strength and shear strength at both room temperature and cryogenic nitrogen temperature of the epoxy adhesive. Moreover, two coupling agents with various contents were used to further enhance the shear strength of the optimal cryogenic epoxy adhesive. Finally, differential scanning calorimetry analysis showed that the modified adhesive showed a higher glass transition temperature than the unmodified adhesive.