汽车风挡玻璃用单组分湿固化聚氨酯胶粘剂

简要介绍了汽车风挡玻璃用胶粘剂的发展历史,对汽车风挡玻璃用胶粘剂的要求和单组分湿固化聚氨酯胶粘剂的性能、一般配方。论述了汽车风挡玻璃用单组分湿固化聚氨酯胶粘剂技术进展及发展趋势,并结合国内现状,提出了一些建议。     

集成材用单组分湿固化聚氨酯胶粘剂的研制

研究了不同异氰酸酯、NCO质量分数、不同聚醚、助剂对集成材用单组分湿固化聚氨酯胶粘剂性能的影响,综合考虑胶粘剂的固化速度、粘接强度、粘度、耐水性等因素,调整配方以达到集成材加工所需要求,提出了有待进一步研究的问题。     

汽车用聚氨酯胶粘剂的研究进展

介绍了几种最常用的聚氨酯胶粘剂，如单组分湿固化聚氨酯挡风玻璃密封胶、粘接FRP和SMC材料用聚氨酯结构胶粘剂、汽车内饰用水性聚氨酯胶粘剂等在汽车制造和修理上的应用现状及各自的研究进展，展望了汽车用聚氨酯胶粘剂的未来发展前景。     

单组分环保木材胶粘剂的合成

本研究以多亚甲基多苯基多异氰酸酯(PM200)、蓖麻油和聚丙二醇(PPG-600)为主要原料合成木材用单组分湿固化聚氨酯胶粘剂,蓖麻油和PPG-600可以改善胶粘剂的粘度、耐水性和粘接强度,催化剂可以提高胶粘剂的固化速度。该胶粘剂粘接性能好,固化速度快,不含有机溶剂,反应活性高,可用于异种木材和高含水率木材粘接。     

木材用单组分湿固化聚氨酯胶粘剂的合成

以多亚甲基多苯基多异氰酸酯(PAPI)、聚丙二醇(PPG-N210)和催化剂2,2'-二吗啉二乙基醚(DMDEE)为主要原料合成了一种木材用单组分湿固化聚氨酯胶粘剂,分析了NCO含量、催化剂用量、扩链系数对胶粘剂性能的影响,并与国内外木材用胶粘剂进行了比较。结果表明,NCO质量分数为12.3%、催化剂用量为0.1%、扩链系数为0.2,制得的胶粘剂室温固化且固化速度快,粘接性能较好,适合于木材的粘接。     

单组分湿固化聚氨酯胶粘剂的研究进展

介绍了单组分湿固化型PU(聚氨酯)胶粘剂的发展概况,讨论了该类胶粘剂预聚体的合成方法。重点介绍了两种新型单组分湿固化PU胶粘剂(硅氧烷封端湿固化PU胶粘剂和潜性湿固化PU胶粘剂),并展望了其发展前景。     

用于木材粘接的反应型聚氨酯胶粘剂

本文讨论了反应型聚氨酯胶粘剂的配方及其在木材粘接中应用。重点讨论单组分液体型、热熔型和木材复合板粘接用反应型、湿气固化聚氨酯胶粘剂。     

MDI型单组分湿固化聚氨酯胶粘剂的研制

用MDI取代TDI,研制了MDI单组分湿固化聚氨酯胶粘剂。讨论了多种因素对胶粘剂性能的影响。结果表明,该胶粘剂满足了性能要求,既降低了成本,又符合环保要求。     

聚氨酯密封胶国外研究进展

介绍了国外在提高聚氨酯密封胶固化性、粘接性、弹性及耐候性等性能方面的研究成果 ,内容涉及单组分湿固化密封胶 (含硅烷改性单组分胶 )及普通双组分密封胶、含多硫化物的双组分聚氨酯密封胶     

一种双固化单组分体系聚氨酯密封胶的研制

以醛亚胺为固化剂制备了一种双固化单组分聚氨酯密封胶,考察了固化剂对聚氨酯密封胶性能的影响。研究结果表明:相对于普通聚氨酯密封胶,该密封胶在高温高湿下固化不鼓包,耐热性明显提高,对多种基材粘接性能优异。     

聚乙烯用胶粘剂研究进展

综述了近年来聚乙烯用胶粘剂的研究进展,分析了聚乙烯难粘原因,重点讨论了丙烯酸类胶粘剂、聚氨酯胶粘剂、SBS胶粘剂、压敏型胶粘剂、改性EVA胶粘剂、氯化聚丙烯基胶粘剂以及其它聚乙烯用胶粘剂。最后分析了目前聚乙烯用胶粘剂现状及发展方向。     

我国胶粘剂工业现状及应用进展

介绍了我国胶粘剂工业的现状以及各类胶粘剂的应用进展,其中主要包括环氧树脂胶粘剂,聚氨酯胶粘剂,有机硅胶粘剂,以及耐高、低温等特种胶粘剂,并对国内胶粘剂市场的前景作出了展望。     

特种胶粘剂的研究进展

介绍了在特殊环境下具有特殊粘接效果的特种胶粘剂(包括耐高温胶粘剂、耐低温胶粘剂、密封胶、医用胶、真空胶、耐碱胶和点焊胶等)的研究进展和应用现状,并对特种胶粘剂的发展进行了展望。     

高固含量水性丙烯酸酯乳液制备及其作为胶粘剂应用进展

高固含量水性丙烯酸酯乳液作为胶粘剂可分为压敏胶粘剂、纸塑复合胶粘剂、塑木复合胶粘剂、木材胶粘剂、建筑胶粘剂、纺织胶粘剂、汽车胶粘剂等;介绍了水性丙烯酸酯乳液的制备及应用,展望了其应用前景与发展方向。     

聚氨酯胶粘剂的研究进展

综述了聚氨酯胶粘剂的合成、特性和种类。概述了近年来国内外聚氨酯胶粘剂的研究和应用进展,重点介绍了聚氨酯胶粘剂的发展动态和几类主要的聚氨酯胶粘剂,并对其进行了分析,结合实际情况对今后聚氨酯胶粘剂的发展方向作出了展望。     

考虑胶层的自由型垫高阻尼结构振动特性研究

考虑胶层在自由型垫高阻尼结构中传递应力、应变的作用,将胶层等效为各向同性材料,采用ANSYS和MATLAB的联合仿真方法,分析含胶层的自由型垫高阻尼结构振动特性随胶层参数的变化规律。利用模态应变能法和控制变量法得到的结果表明,胶层对结构振动特性起着关键性的作用,因此,选择胶粘剂敷设自由型垫高阻尼结构时,应在保证胶层力学环境良好的前提下,选择满足胶层最佳特性区间的胶粘剂产品。     

新型镀铝复合薄膜专用胶粘剂的研究

分析了影响BOPP／VMCPP型镀铝复合薄膜剥离强度的主要因素,即：BOPP和胶粘剂的界面强度;胶粘剂和VM的界面强度;VM和CPP的界面强度,以及胶粘剂的组成、分子结构、相对分子质量分布、单体残存量等,并合成了一种新型的镀铝膜和塑料薄膜复合用聚氨酯胶粘剂;讨论了胶粘剂的相对分子质量、相对分子质量分布、固化温度和时间等因素对粘结性能的影响。试验结果表明：该胶粘剂初粘力强、剥离强度高、溶剂残留量低,适用于快速复合薄膜生产线。     

Effect of adhesive free-end geometry on the initiation and propagation of damaged zones in adhesively bonded lap joints

In this study the effect of adhesive free-end geometry on the initiation and propagation of damaged zones in adhesively bonded single- and double-lap joints was investigated considering the material non-linear behaviour of both adhesive and adherends and the geometrical non-linearity. The damaged adhesive and adherend zones exceeding the specified ultimate strains were determined based on the modified von Mises criterion for adherends and the failure criterion, including the effects of the hydrostatic stress states for the epoxy adhesives proposed by Raghava and Cadell. The stiffness of each finite element in the damaged zones was reduced to a negligible value, thus not contributing to the overall stiffness of the adhesive joint. This simple method provides useful information on the initiation and propagation of damaged zones in both the adhesive layer and adherends. The damaged adhesive zones due to a tensile load were observed to initiate around the rounded adherend corners inside the adhesive fillets and to propagate first towards both the free surface of the adhesive fillet and across the adhesive layer, and later along the adherend–adhesive interface. The damaged adhesive zones initiate at the left free-end of the adhesive-upper adherend interface and at the right free-end of the adhesive-lower adherend interface and propagate along these interfaces in the large adhesive fillets. In the bending test, the damaged adhesive zones appeared only at the left free-end in tension of the adhesive-upper adherend interface for the large adhesive fillets, but around the lower adherend corner for the smaller adhesive fillets. Later, it propagated with a similar mechanism as in the tensile load. In a double-lap joint subjected to a tensile load, the damaged zone appeared around the upper adherend corner inside the right adhesive fillet in tension, and propagated first towards the free surface of the adhesive fillet and through the adhesive layer towards the adhesive-middle adherend interface, and later along this interface. For all loading conditions, increasing the adhesive fillet size caused the damaged zone initiation to occur at a larger load level. The SEM micrographs of fracture surfaces around the adhesive fillets showed that the damaged zones initiated around the adherend corner inside the adhesive fillet and propagated through the adhesive fillets.     

Joint strength optimization by the mixed-adhesive technique

An ideal adhesive lap joint is one in which the adhesive flexibility and strength properties vary along the overlap length. Because of greater adhesive shear strains at the edges of the overlap, a ductile and flexible adhesive should be used at the overlap ends, while in the middle a stiff and less-ductile adhesive should be used. This technique has been investigated in the past but only a few studies have reported any experimental evidence. In the present study, single-lap adhesive joints were manufactured and tested maintaining the same brittle adhesive in the middle of the overlap and using three different ductile adhesives of increasing ductility at the ends of the overlap. A simple joint strength prediction is proposed for mixed-adhesive joints. The mixed-adhesive technique gives joint strength improvements in relation to a brittle adhesive alone in all cases. For a mixed adhesive joint to be stronger than the brittle adhesive and the ductile adhesive used individually, the load carried by the brittle adhesive must be higher than that carried by the ductile adhesive.     

增稠在丙烯酸酯乳液胶黏剂分子设计中的作用

在制备乳液胶黏剂时经常要将乳液增稠。本文从减小乳液胶黏剂的表面张力、提高乳液胶黏剂的稳定性、为不使胶黏剂渗入被粘材料、为使胶黏剂涂复的厚度达到一定的要求等四个方面分析了增稠在乳液胶黏剂分子设计中的作用,并对乳液胶黏剂的增稠方法,内增稠和外增稠作了详细的介绍。