基于磁共振与高频超声的颈椎重建胶固性能与应用研究

基于磁共振与高频超声的颈椎重建用胶固化性能和拉剪强度性能要求的需要,以双酚A型环氧树脂和3种常温固化型胺类固化剂为主要原料,制备了3种不同组分的常温固化型胶粘剂,对比分析了胶粘剂的固化性能、室温拉剪强度和断口形貌。结果表明,随着固化温度的升高,3种胶粘剂的固化时间都呈现下降的趋势;在相同固化温度下,3种胶粘剂固化时间从小至大顺序依次为：胶粘剂1号、胶粘剂2号、胶粘剂3号,即胶粘剂1号的固化时间最短。随着固化温度升高,3种胶粘剂试样的拉剪强度平均值都呈逐渐上升的趋势;在相同固化温度下,3种胶粘剂试样的拉剪强度从大至小的顺序依次为：胶粘剂1号、胶粘剂2号、胶粘剂3号;弹性模量从大至小顺序依次为：胶粘剂1号、胶粘剂2号、胶粘剂3号;断后伸长率从小至大的顺序依次为：胶粘剂1号、胶粘剂2号、胶粘剂3号。虽然胶粘剂1号的固化时间最短,但其拉剪强度平均值最低,推荐重建用常温固化型胶粘剂使用胶粘剂3号。     

基于空间设计的5089结构胶改性制备与应用策略研究

基于环境空间设计需要,对空间设计用5089胶粘剂进行了改性处理,对比分析了3种不同改性胶粘剂的动态热机械分析曲线和玻璃化转变温度-固化温度关系曲线。结果表明,与改性胶粘剂A相比,相同固化温度下改性胶粘剂B和改性胶粘剂C的储能模量都相对较高,且在固化温度为100～130℃时,改性胶粘剂A、改性胶粘剂B和改性胶粘剂C都兼具弹性和粘性;耐热性从高至低顺序依次为改性胶粘剂B、改性胶粘剂C、改性胶粘剂A,且改性胶粘剂B在固化温度100、110和130℃时的玻璃化转变温度都高于原始5089胶粘剂,表明改性胶粘剂B在此温度下的胶接接头耐热性能都优于原始5089胶粘剂。     

基于数学模型的胶粘剂设计方法研究

为减少胶粘剂试验次数、缩短胶粘剂配方和工艺研究时间,首先运用支撑向量法建立了胶粘剂的配方、技术和性能指标之间的关系,之后运用灰狼优化算法对胶粘剂组分和工艺参数进行优化选择,从而实现胶粘剂最优化设计,即胶粘剂性能参数最优时所对应的配方参数。试验结果表明,灰狼优化算法可以缩短试验次数,且可以优化获取胶粘剂最佳性能工艺参数,为胶粘剂优化设计提供新的方法。     

建设工程常用胶粘剂的发展与展望

基于胶粘剂的发展脉络,讨论了胶粘剂的分类及介绍了常用类型的胶粘剂如：硅酸盐胶粘剂、磷酸盐胶粘剂、硫酸盐胶粘剂、丙烯酸酯胶粘剂、环氧树脂胶粘、剂酚醛树脂胶粘剂和脲醛树脂胶粘剂的特点,归纳了各种胶粘剂的应用场景,重点分析了胶粘剂在建筑混凝土领域的应用,提出了胶粘剂在建筑混凝土领域的发展前景及未来的发展方向。     

浮空器囊体用聚氨酯胶粘剂性能测试分析研究

介绍了胶粘剂在浮空器上的应用,分析了浮空器囊体粘接用胶粘剂基本要求,然后对浮空器国产专用胶粘剂和某进口胶粘剂进行初粘性、胶接强度、耐高温性能及老化性能对比试验研究,最后根据试验结果阐述了国产胶粘剂的综合性能相对进口胶粘剂存在的不足,为提升国产浮空器囊体粘接用胶粘剂综合性能提供一定的参考。     

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。     

复合催化间苯二酚/膨润土改性酚醛树脂胶粘剂研究

以苯酚和甲醛为原料,选取氢氧化钡[Ba(OH)2]/氢氧化钠(NaOH)为复合催化剂,采用两步加入甲醛法合成了中温固化酚醛树脂(PF)胶粘剂;然后以间苯二酚、膨润土为改性剂,探讨了改性剂含量、反应时间等对改性PF胶粘剂性能的影响,并通过对改性PF胶粘剂的黏度、密度、固含量以及胶接强度等测试,比较了改性PF胶粘剂合成条件的影响。研究结果表明:间苯二酚作为改性剂可明显提高胶粘剂的耐水性能;合成的改性PF胶粘剂的储存期超过60 d,但延长反应时间会使PF胶粘剂的储存期缩短;膨润土对PF胶粘剂性能的影响较复杂;间苯二酚与膨润土同时加入时,前者对PF胶粘剂的性能改进起决定作用。     

我国木材工业用胶粘剂的现状、存在问题及对策

本文介绍了脲醛树脂胶粘剂、酚醛树脂胶粘剂、三聚氰胺甲醛树脂胶粘剂、聚醋酸乙烯乳液胶粘剂、聚氨酯胶粘剂、热熔胶粘剂等木材工业用胶粘剂的现状和研究进展。分析了目前木材工业用胶粘剂存在的问题,初步提出了解决问题的对策。     

齿科光固化胶粘剂的研究进展

介绍了齿科光固化胶粘剂的特征、固化机理和组成,重点阐述了复合树脂为基质胶粘剂的发展,并对齿科光固化胶粘剂的研究趋势作了展望。     

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。     

新型溶剂在低毒氯丁型万能胶中的应用

以改性丙酮、6^＃抽提溶剂油为主溶剂配制了一种价格适中、低毒快干氯丁型万能胶。该胶粘接强度较高，粘度低，易涂刷，在常温下柯稳定贮存9个月，适用于木材、人造板、家具等的粘贴。     

EVA改进聚醋酸乙烯乳液粘合剂性能的研究

本研究采用EVA乳液作为种子进行聚合制备改性聚醋酸乙烯乳液粘合剂。讨论了EVA乳液的用量对聚合物的耐寒性、表面张力的影响。同时,对聚合温度、搅拌速度、引发剂用量、聚合保温时间等进行了选择。改性后的白胶粘合剂具有多次循环的冻融稳定性,且对低表面能材料的粘接强度明显高于通用白胶     

The influence of adhesive viscosity and elastic modulus on laser spot weld bonding process

Laser spot weld bonding (LSWB) is a novel joining technology, which combines laser spot welding with a layer of structural adhesive in a single joint. The purpose of this paper is to investigate the effect of the adhesive properties on the joining process, the peel and the shear strength of the LSWB joints. The present work demonstrates that the adhesive viscosity has great influence on the vaporized adhesive gas exhaust process, and the low viscosity is good for the exhaust process. The mechanical test result shows that the tension–shear load of LSWB joint isn׳t always higher than that of the adhesive bonded joint, and LSWB joint with high elastic modulus of adhesive may get the same tension–shear load as the adhesive bonded joint gets. The reaction zone produced by the carbon diffusion between the adhesive and the metal sheet will influence the mechanism of LSWB joint.     

耐热丙烯酸酯胶粘剂的研制

选用甲基丙烯酸甲酯预聚物作为主体树脂,通过交联剂种类及含量对胶粘剂拉伸剪切强度和应力-溶剂银纹性能影响的研究,研制出一种耐热性能满足使用要求的丙烯酸酯胶粘剂。试验结果表明,适量的交联剂有利于提高胶粘剂的耐温性能,但交联剂加入量过大对胶粘剂起到增塑作用,反而不利于胶粘剂高温性能的改善。高分子材料由于吸收和扩散的速度较慢,不易使有机玻璃产生银纹,提高胶粘剂中高分子材料的含量,有利于胶粘剂应力-溶剂银纹性能的提高。     

混合胶接劈裂接头胶层中应力分布的数值分析

采用ANSYS有限元分析软件,对由两种弹性模量相差悬殊的丙烯酸酯和环氧树脂胶粘剂连接的劈裂接头胶层中部的应力分布进行数值分析和讨论。结果表明:对于采用单一胶连接的劈裂接头来说,采用弹性模量较低的胶粘剂更为有利;混合胶劈裂接头因其存在应力集中程度较高,会导致接头的强度降低。     

不同种类粘合树脂对轮胎带束层胶料性能的影响

研究不同种类粘合树脂对轮胎带束层胶料性能的影响。结果表明:新型粘合树脂MPRF,PRF和MPF游离单体含量低,在胶料加工过程中不产生刺激性气味,不冒烟,环保;与添加普通粘合树脂SRF的胶料相比,添加新型粘合树脂MPRF,PRF和MPF的胶料F_(L)和F_(max)较低,抗硫化返原性相对较好,门尼焦烧时间较长,胶料加工安全性提高;硫化胶的拉伸强度和拉断伸长率较高;钢丝帘线H抽出力在1000 N以上,完全能满足带束层对钢丝帘线粘合性能的要求。     

Thermostable adhesives based on monomers with CN-multiple bonds

The dependence of the adhesive strength (τ) of joints composed of modified polycyanurates (REOLANs) and polyisocyanurates (TRNPs) and a steel wire on the adhesive composition, conditions of their synthesis, and test temperature has been studied. Measurements were conducted using the pull-out technique in the range 20-300°C. The modification of REOLANs with a monomer additive (MA) and of TRNPs with low molecular telechelic rubbers made it possible to increase the interfacial strength. The dependence of τ on the amount of modifier added is described for both systems by a curve with a maximum; the maximum is observed at a low content (5-10 wt%) of the modifier. At room temperature, REOLANs exhibit a higher adhesive strength to the steel wire than TRNPs. As the test temperature is raised, the joints with REOLANs lose their strength much faster than TRNPs; however, up to 250 C the values of τ for REOLANs exceed the adhesive strength of TRNPs. Comparison of the temperature curves of the adhesive strength of the polymers studied with analogous curves for polymers studied earlier demonstrates the advantages of REOLANs and TRNPs as thermostable adhesives. Possible mechanisms that determine the observed dependence of the adhesive strength on the content of the modifier and temperature are discussed.     

室温固化耐高低温环氧胶黏剂的研制

研制了一种室温固化耐高低温环氧胶黏剂。E-51与低黏度的711环氧树脂配合使用作为主体树脂,同时使用20%wt的自制增韧剂增韧,胶黏剂的综合性能较好,且具有良好的耐高低温性能。胶黏剂室温固化24h即能接近完全固化,耐介质和耐湿热老化性能优异。所制胶黏剂黏度低,可用于粘接和灌封。     

紫外光（UV）固化胶黏剂收缩率与强度的研究

UV胶黏剂的固化收缩率与固化后的残留应力乃至粘接强度有着密切关系。对比UV胶黏剂中不同丙烯酸单体、几种低聚物和阳离子单体的收缩率和相应的粘接强度。讨论了单体和树脂类型对收缩率和粘接强度的影响。介绍了以低收缩丙烯酸酯树脂和阳离子树脂为主体树脂,以低收缩单体为稀释剂、配合填料和适当增强剂制备出混合型UV胶黏剂。该胶黏剂粘接强度和耐久性好,其固化收缩率为3．5％,远低于普通自由基型UV胶黏剂。经湿热老化试验后,粘接强度保持率仍保持在80％。     

Dynamic Mechanical Properties and Adhesive Joint Strengths of Emulsion Polymers Produced by Power Feed Technique. III. Adhesive Joint Strengths of Grafted Power Feed Copolymer

Power feed copolymers were synthesized using styrene and n-butyl acrylate through non-uniform feeding emulsion polymerization. Poly(vinyl alcohol) (PVA) was used as a protective colloid, onto which vinyl monomers were grafted. Power feed copolymer had a very broad glass transition temperature compared with random copolymer, even if grafting and/or crosslinking were introduced to the system. This tendency was almost the same as the non-grafted power feed copolymer where only low molecular weight surfactant was used.

Adhesive joint strengths of power feed copolymers were evaluated compared with random copolymers. In the case of usual linear power feed copolymer, the adhesive joint strengths were not higher than those of random copolymer, which was considered to be due to the lower film strengths of the power feed copolymer. Power feed copolymer having grafting showed slightly higher adhesive joint strengths over a wide range of temperatures than random copolymer. When crosslinking was introduced to the system, power feed copolymer showed much higher adhesive joint strengths over a wide temperature range.