双组份快干型木材粘合剂AB胶的研制与应用

介绍了一种用于木材粘接的双组份胶粘剂,对木材被粘接面二面分别涂布施胶后接合,常温下3- 5min板材固化定位,30～60min后达到70%的最终强度,并且具有较好的耐水耐碱性和剪切强度。     

ODF框胶的制备及性能研究

制备了LCD用ODF框胶,采用FTIR-ATR和测定凝胶含量的方法分析了框胶的UV固化速度以及固化程度。采用SEM对ODF框胶中填料的分散状态进行了分析,对ODF框胶的粘接性能进行了考2查。结果表明,在UV固化能量达到1 500 mJ/cm时即可固化完全,凝胶含量达到99.88%。添加到框胶体系中的有机硅微粉和白炭黑分散均匀,无团聚颗粒存在;ODF框胶对玻璃的粘接强度较高,达到17.90MPa,经过水煮老化处理后对玻璃的粘接强度仍达到15.12 MPa。     

快三秒鞋用修补胶

浙江黄岩光华胶粘剂厂生产的快三秒鞋用修补胶，其突出的特点是固化速度极快，以几秒钟计；粘接强度很高，以牢固著称；适应范围较广，各种鞋类皆宜。使用非常方便，只要将胶液少量挤涂于经处理的洁净、干燥、无油破损部位之一面，立即对准叠合，仅需轻微指压，几秒钟便可固化定位。经应用实验表明，产品说明完全属实，毫无哗众取宠之意，对于皮鞋、胶鞋、塑料鞋、旅游鞋等的开线、开胶、开裂、磨损补片均有快速修补之功效：真可谓几秒钟即可粘住；几分钟，便能穿用；有韧性、不会脆裂；     

IT产业与粘接技术

IT ,即信息技术 (INFORMATIONTECHNOLOGY)是一门与电子计算机和互联网紧密相关的高新技术产业。其中包括相关电子设备制造业、电气通讯业、利用电子计算机的情报服务业等 ,这是一个在 2 1世纪增长势头强劲的新兴产业。仅在日本 ,市场规模就达 10兆日圆 (约合 6 2 0 0亿人民币 )企业约 6 0 0 0家。特别是电子产品、电子元件、半导体、印刷电路、配线等方面更是采用新技术、新产品最多的领域。例如 ,半导体的包封即随着移动电话、摄象机的小型化、轻量化向着轻量、薄型的方向发展。IT产业中所采用的新产品、新技术中离不开胶粘剂和…     

阵列波导器件封装用UV胶粘接力学性能分析

以阵列光纤与波导芯片的粘接力学性能为研究对象,首先理论分析UV固化胶的不同布胶方式下封装器件承受的最大拉伸力、剪切力和弯曲力,然后运用有限元软件对接头受力所产生的应力分布进行仿真分析。通过对模型的计算和仿真结果的对比分析,在经济性、可靠性和可操作性等原则下,提出了在耦合端面涂胶的优化布胶方式。     

纤维板用脲醛树脂胶的制备与性能研究

通过分步加入尿素制备废纸纤维板粘合剂,研究了合成工艺对脲醛胶性能的影响。实验得出,采用甲醛与尿素的物质的量比为1.4,尿素分3次投入,在调pH值弱碱性之前加入聚乙烯醇(PVA),合成反应稳定,粘合剂的粘接强度提高,游离甲醛质量分数降低至0.2%以下,贮存期为50d以上。     

粘接制动蹄用耐高温胶粘剂及其粘接性

介绍一种新型酚醛－－丁腈并用耐高温高强度单组分浆状结构胶粘剂和组成比例以及固化条件对粘接强度的影响，该胶适用于粘接刹车制动蹄和飞机轻金属结构等。     

铅酸蓄电池用密封胶的性能及其固化动力学研究

采用自制的环氧树脂和改性多胺固化剂制备了铅酸蓄电池密封胶。通过示差扫描量热法(DSC)对该体系的固化过程进行了研究,利用Kissinger,Crane方程对其固化反应进行了动力学分析并测定了体系的粘接性能。结果表明:该体系反应活化能Ea为54.76 kJ/mol,频率因子A为1.66×107/s,固化反应级数n=0.898,固化工艺为25℃/24～48 h+60～70℃/1～2 h,密封胶固化后的剪切强度达5.5 MPa以上。经相关电池厂家验证,可满足蓄电池壳盖密封的要求。     

玻璃钢构件粘接用环氧胶粘剂性能研究

对环氧/三乙烯四胺、环氧/低分子量聚酰胺两种环氧胶粘剂体系的适用期、耐不同介质腐蚀性能、对玻璃钢与不同基材间的粘接性能进行了研究.结果表明:室温下环氧/低分子量聚酰胺体系的适用期可达数小时,显著长于环氧/三乙烯四胺体系(经活性稀释剂调节后约76min),其耐盐水和耐碱腐蚀性能低于环氧/三乙烯四胺体系,对玻璃钢与不同基材...     

汽车用折边胶

《河北化工》与北方化工网推介一种以改性环氧树脂为基料的汽车折边胶新产品。该产品属于结构型胶粘剂,具有粘接强度高、可点焊、耐腐蚀、耐热及抗老化等性能,适用于汽车车门、发动机机盖与箱盖等折边结构的粘接。在使用条件方面,该产品具有较宽的固化条件,施工适应性能强,有利于汽车制造、维护与保养使用。     

鱼鳔及其鱼鳔胶粘剂(三)鱼鳔胶粘剂的力学性能

实验以三种不同的鱼鳔 ,在考查固胶物化性能的同时 ,探索了胶接工艺对胶接性能的影响 ,结合实际应用对基材试件、胶接试件等有关力学性能作了研究     

UV胶粘接ABS固化速率的研究

介绍了紫外光固化速率的基本概念和特点,讨论了光引发剂、预聚物、活性稀释剂及氧阻聚对ABS粘接时固化速率的影响.     

催化剂对生物油-酚醛树脂胶粘剂性能的影响

分别利用单一催化剂NaOH以及NaOH与金属化合物复合催化荆,合成了生物油-酚醛树脂胶粘剂,并对胶粘剂的胶合强度和凝胶时间进行了研究。研究发现。以复合催化剂制备的生物油-酚醛树脂胶粘剂的胶合强度比以单一催化剂制备的强度高,且凝胶时间短,其中以复合催化剂（Na2CO3＋NaOH）的作用最显著。     

On the effect of pulsed laser ablation on shear strength and mode I fracture toughness of Al/epoxy adhesive joints

The present work describes an experimental study about the shear strength and the mode I fracture toughness of adhesive joints with substrates pre-treated by pulsed laser ablation. An ytterbium-doped pulsed fiber laser was employed to perform laser irradiation on AA6082-T4 alloy. Morphological and chemical modifications were evaluated by means of surface profilometry, scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). Thick adherend shear tests were carried out in order to assess the shear strength while the mode I fracture toughness was determined using the double cantilever beam. For comparison, control samples were prepared using classical surface degreasing. The results indicated that laser ablation has a favorable effect on the mechanical behavior of epoxy bonded joints; however, while a + 20% increase was recorded for shear strength, a remarkable threefold enhancement of fracture toughness was observed with respect to control samples. XPS analyses of treated substrates and SEM observations of the fracture surfaces indicated that laser pre-treatment promoted chemical and morphological modifications able to sustain energy dissipation through mechanical interlocking. As a result cohesive failure within the adhesive bond-line was enabled under predominant peel loading.     

聚硫橡胶对环氧树脂固化动力学及力学强度的影响

用红外光谱分析了在环氧树脂中加入聚硫橡胶的固化及增韧过程,通过差示扫描量热法研究了增韧体系的反应动力学,探讨了聚硫橡胶用量对固化产物力学强度的影响,并对试样断口形貌进行了扫描电镜观察。结果表明,聚硫橡胶的加入降低了环氧树脂的表观活化能而没有改变反应级数,使得固化反应的总放热量减少、放热过程更加平均。聚硫橡胶对环氧树脂的增韧效果明显,二者通过化学键结合,韧性撕裂的冲击断面形貌验证了这种活性增韧。当聚硫橡胶用量为30份(质量)时,环氧树脂固化物的冲击强度可达到未增韧者的896%。     

酶解木质素改性三聚氰胺脲醛树脂的制备与应用

以酶解木质素（EL）、尿素（U）、甲醛（F）和三聚氰胺（M）为原料,采用碱反应工艺制备了酶解木质素改性三聚氰胺脲醛树脂（ELMUF）。分别考查了EL用量对制备的ELMUF树脂的固化时间、固化温度、游离甲醛量及其制备胶合板胶合强度和甲醛释放量等性能的影响,随着EL用量的增加,ELMUF树脂游离甲醛量从0.26%逐渐降低至0.12%,固化时间从96 s逐渐延长至152 s,黏度由86 mPa·s迅速升高至1 140 mPa·s。通过DSC测定不同EL用量的脲醛树脂固化过程,结果表明：随着EL用量的增加脲醛树脂的反应活性逐渐降低,固化温度由120.6℃逐渐升高至132.0℃,对热压工艺要求更加苛刻。     

一种高韧性耐湿性环氧树脂的合成及其性能研究

利用β-甲基环氧氯丙烷与双酚A在氢氧化钠的存在下合成了一种新的甲代双酚A型缩水甘油醚环氧树脂(BPA-MECH EP)预聚物,并通过FT-IR、1H NMR、GPC等手段对产物结构进行了表征。用盐酸-丙酮滴定法测定其环氧值为0.43 mol/100 g。用DDM作固化剂,利用DSC对其添加量为树脂质量的20%时体系的固化反应动力学以及最佳固化工艺条件进行了探讨。实验结果表明:BPA-MECH/DDM固化体系的反应级数n为1.30;表观活化能为15.37 kJ/mol;最佳固化工艺条件为:120℃/1 h→140℃/1 h→175℃/3 h→200℃/1 h逐步阶段升温固化。与E-44的DDM固化物进行了性能比较,结果表明:BPA-MECH与E-44固化产物的热变形温度无显著差别,但吸水率降低了47.6%,弯曲强度和弯曲模量分别提高了10.5%和7.8%,冲击强度上升了129.4%,拉伸强度、弹性模量以及断裂伸长率都有不同程度的提高,最大增幅分别为27.6%、25.9%和12.9%。研究结果表明,甲代双酚A型缩水甘油醚环氧树脂是一种性能优良的环氧树脂预聚物。     

Synthesis and characterization of diphenylsilanediol modified epoxy resin and curing agent

A series of diphenylsilanediol modified epoxy resins and novel curing agents were synthesized. The modified epoxy resins were cured with regular curing agent diethylenetriamine (DETA); the curing agents were applied to cure unmodified diglycidyl ether of bisphenol A epoxy resin (DGEBA). The heat resistance, mechanical property, and toughness of all the curing products were investigated. The results showed that the application of modified resin and newly synthesized curing agents leads to curing products with lower thermal decomposition rate and only slightly decreased glass transition temperature (T_g), as well as improved tensile modulus and tensile strength. In particular, products cured with newly synthesized curing agents showed higher corresponding temperature to the maximum thermal decomposition rate, comparing with products of DGEBA cured by DETA. Scanning electron microscopy micro images proved that a ductile fracture happened on the cross sections of curing products obtained from modified epoxy resins and newly synthesized curing agents, indicating an effective toughening effect of silicon–oxygen bond.     

Enhancement of bonding strength between lead wires and ceramic matrix of metal ceramic heater

In recent years, metal ceramic heaters (MCHs) have become widely used in daily life and industrial applications. This paper introduces a method for producing an MCH with high bonding strength of the bonding wires by adding oxide additives (Al₂O₃, SiO₂, and MgO) to a metal slurry. Pilot experiments were carried out at 1600°C under a protective atmosphere. The results indicate that the temperature coefficient of resistance of the samples decreases whereas the bonding strength vastly increases, and the pulling forces of the bonding wires in the samples extends from 2 to 32 N. The pulling forces are progressively increased as the content of the spinel phase in the oxide additives increases. The mechanism of enhancement of the bonding strength is discussed herein. The microstructure characterization, element mapping, and element analysis of different samples were performed using a scanning electron microscope (SEM). The results indicate that the formation of a W-Si solid solution in the sample is the main reason for the decrease in temperature coefficient of resistance. The interface between the metal and spinel layers forms a zigzag and interlocked shape, which significantly improves the bonding strength between the lead wires and the ceramic matrix of the MCH.     

蒸养后补充养护方式对混凝土性能的影响

为改善蒸养对混凝土性能的不利影响,采用蒸养后补充养护的方式提高混凝土28 d龄期抗压强度和耐水性.蒸养后再水中养护或室外湿织物覆盖12～48 h,混凝土28 d抗压强度和软化系数先增加后降低.蒸养后再标准养护时,混凝土28 d抗压强度和软化系数随标养时间增加而增加.蒸养后再薄膜覆盖的混凝土28 d抗压强度和软化系数也随覆盖时间增加而增加.采用蒸养后补充养护的混凝土28 d抗压强度和软化系数均优于蒸养后直接进入室外自然养护的混凝土.其中,薄膜覆盖是对蒸养混凝土较优的一种补充养护方式.