高性能航空KH-CL-RTV-2型硅橡胶胶粘剂的粘接工艺研究

以高性能航空KH-CL-RTV-2型硅橡胶作为胶粘剂,采用单因素试验法着重考察了固化工艺、稀释剂用量、金属基材、单双面喷胶、胶层厚度和填料等因素对胶粘剂粘接强度的影响,从而优选出胶接件的最佳施胶工艺;最后利用硅橡胶黏度-时间曲线对胶接件的固化过程进行了验证和解释。研究结果表明:稀释剂环己烷用量对胶接件的粘接强度无影响;胶接件的最佳施胶工艺是双面喷胶、胶层厚度为0.50 mm、被粘基材为除油打磨处理后的铝合金、固化温度为50℃和固化时间为36 h,此时胶接件的粘接强度(为3.04 MPa)相对较大。     

金属用底胶表面处理的工艺研究

以730胶粘剂为底胶对金属被粘表面进行处理。试验了底胶和处理工艺对金属与丁腈橡胶粘接强度的影响，对产品进行了老化试验和实际应用。结果表明，该工艺金属被粘面的活性期长达21d，且可大幅度提高粘接强度。     

旋翼调整片粘接强度分析与影响因素研究

详细分析了旋翼调整片粘接剥离破坏过程和应力分布变化,并研究了粘接宽度和胶层厚度对粘接强度的影响。使用共固化制备相应的粘接试样,通过剥离试验得到接头的破坏模式及载荷-位移曲线。研究结果表明:接头有限元数值分析结果与试验相契合,接头破坏形式为调整片粘接界面的破坏,破坏为从左向右和由边向中逐渐发生失效;粘接强度随胶接宽度的增加而提高,但增长速度逐步变缓,80 mm为较优搭接宽度值;粘接强度受胶层厚度影响较小,增加厚度时粘接强度先缓慢增加后下降。     

J-164室温固化低密度蜂芯拼接胶黏剂的研制

研制了J-164室温固化低密度蜂芯拼接用环氧树脂胶黏剂。使用液体端羧基丁腈橡胶（5—15质量份）增韧环氧树脂,聚醚胺作为固化剂的主要成分。J-164具有较低的密度（0．7—0．8g／cm^3）,压缩强度为25．5MPa,T型剥离强度为0．8kN／m。在胶层厚度为1．2—1．6mm时,J-164胶的剪切强度达到13．3MPa,可以保证如蜂芯拼接等表面不规则材料之间的良好粘接性能。J-164胶的蜂芯节点拉伸测试试验结果表明,蜂芯的破坏形式均为蜂芯节点脱黏,说明J-164胶在蜂芯拼接处的粘接强度大于蜂芯节点胶的粘接强度。本文还就聚酚氧树脂、液体无规端羧基丁腈橡胶和液体端羧基丁腈橡胶等增韧剂对性能的影响,以及活性环氧稀释剂用量对性能的影响作了详细的讨论。使用差热扫描量热仪研究了J-164胶的固化特性。应用试验结果表明,J-164胶是一种理想的蜂芯拼接用胶黏剂。     

丁腈橡胶改性酚醛树脂/玻纤布复合预浸料的研制

以丁腈橡胶为增韧改性材料,通过对其混炼、溶解并加入热固性酚醛树脂,制得固体含量为40%～45%,黏度为(4 500±300) mPa·s的丁腈–酚醛树脂胶液,再经无碱玻璃布常温下浸渍,并于70～90℃温度下烘干以及成卷等工序制得丁腈–酚醛玻璃布复合预浸料。结果表明,所制得的复合预浸料拉伸强度可达376MPa,拉伸剪切强度为22.96MPa,剥离强度4.5 kN/m。因所用丁腈橡胶种类、丁腈橡胶与酚醛树脂的用量比、丁腈橡胶改性酚醛树脂胶液的黏度、复合预浸料含胶量不同,所以对复合预浸料的拉伸强度、及金属、陶瓷等材料的粘接性能具有不同影响。当采用丙烯腈含量为40%的丁腈橡胶,且酚醛树脂与丁腈橡胶用量比在0.9～1.1时,复合预浸料粘接性能最好;当酚醛树脂与丁腈橡胶用量比在1.4时拉伸强度达到最大值;胶液黏度在4 500mPa·s时,复合预浸料外观质量好,粘结性能好且拉伸强度高;复合预浸料含胶量在42%左右时其粘接性能最好,拉伸强度最高,随着含胶量的继续增大粘接强度和拉伸强度降低。     

风电叶片用环氧结构胶的工艺性能研究

研究了混合后晾置时间、固化程度、混合比例和胶层厚度对风电叶片用环氧结构胶粘接性能的影响。采用拉伸剪切强度和等效剥离强度对粘接性能进行表征。研究表明:结构胶混合后晾置90 min再进行粘接,粘接强度最高;Tg达到60℃后,粘接强度处于稳定状态;在正负5%的配比变化范围内,粘接性能稳定;胶层厚度增加,剪切强度呈线性下降趋势,而剥离性能基本稳定。此项研究为风电叶片合模工艺优化提供了技术基础。     

与金属接触的丁腈橡胶硫黄硫化的特点

试验研究了丁腈橡胶在铜、黄铜、锌底板上的硫化速率,丁腈橡胶硫化胶的强度与硫化时间的关系研究指出,在各硫化阶段橡胶与黄铜的粘接强度始终处于铜和锌之间。     

工艺参数对玻璃钢传动轴粘接性能的影响

研究了粘接工艺过程中基材表面粗糙度、粘接温度、粘接湿度、胶层厚度、固化温度等因素对玻璃钢传动轴粘接部件粘接性能的影响,通过试验得到玻璃钢基材与金属部件粘接的最佳工艺参数。     

用改性环氧胶黏剂粘接硫化丁腈橡胶

以端异氰酸基聚氨酯预聚体改性环氧树脂和双氰胺为主要原料制备了一种单组分耐热环氧树脂胶黏剂,该胶可以对表面未处理的丁腈橡胶进行粘接。文中考察了增韧剂种类、增韧剂用量对粘接强度的影响,同时考察了促进剂种类和用量对凝胶时间和贮存期的影响。实验结果表明,该胶黏剂对丁腈橡胶的粘接强度好,具有较好耐热性和较长贮存期。     

航天器电子产品用环氧胶粘剂粘接工艺研究

选择航天器电子产品中常用的三种环氧胶粘剂,采用具有交互作用的正交试验设计,研究了固化温度、固化时间、胶层厚度、被粘接件的表面状态以及固化压力等因素对拉伸剪切强度的影响规律,并通过数据分析得到三种胶粘剂的拉伸剪切强度回归方程和最优工艺条件。研究结果表明:固化温度对拉伸剪切强度的影响较为明显,较优工艺条件下的拉伸剪切强度实测值与回归方程的预测值基本一致,为航天器电子产品用环氧胶粘剂的选用和粘接工艺技术提供了试验依据。     

粘接用银膏粘接性能的研究

对粘接用银膏（以下简称银膏）的粘接性能进行了分析和研究,主要对偶联剂和增韧剂对粘接强度的影响进行了讨论,通过试验确定了最佳偶联剂和增韧剂及用量,优化了配方,提高了粘接性能。     

Adhesive bonding of polyethylene

The treatment of polyethylene film with aqueous ammonium peroxydisulfate solutions prior to adhesive bonding to aluminum has been studied. Such pretreatments resulted in the formation of adhesive joints of high strengths when bonded with a conventional epoxy adhesive. The effect on the tensile shear strength of adhesive joints of variations in the treatment time and temperature and the peroxydisulfate concentration has been examined. The use of certain catalysts for the reaction has also been studied. Tensile shear strengths at least as high as with other pretreatment methods have been obtained.     

Low-temperature bonding mortars

Several bonding mortars composed predominantly of Na₂O?B₂O₃?SiO₂ and Na₂O?Al₂O₃?SiO₂ were investigated. They serve to join refractories used in structures that operate cyclically at 900–1000°C, as in tunnel-kiln cars for the bisque firing of porcelain ware.     

Four-center carbon-carbon bonding

The 2.89-A intradimer separation for cofacial [TCNE]2(2-) (TCNE = tetracyanoethylene) dimers is twice that of conventional C-C bonds but approximately 0.6 A shorter than the sum of the van der Waals radii. Experimental and computational studies best characterize the intradimer bonding as a 2-electron-4-center (2e(-)-4c) C-C bonding interaction (or bond). This nonconventional bonding exhibits unique spectroscopic properties (new, lower energy electronic absorption, new nuCC and new and shifted nuCN and deltaCCN vibrational absorptions, and characteristic 13C NMR chemical shifts) and is diamagnetic. [TCNE]2(2-) is a prototype of a growing number of organic compounds that are best described by multicenter C-C bonding.     

工艺条件对拉伸试件粘接强度分散性的影响

以铝和丁基橡胶的粘接拉伸试件为研究对象,结合粘接过程被粘面表面处理、涂胶、加压、固化等主要工序,讨论了粘接工艺方式和粘接过程控制对拉伸试件粘接强度分散性的影响。结果表明,在粘接过程中采用适当的表面处理方法、涂胶方式,确定适当的加压压力、涂胶厚度和固化条件,有利于减小粘接件拉伸强度数据的分散性并提高粘接强度。     

CO2气体保护焊与锡槽底板的焊接

锡槽是浮法玻璃成型的关键设备,由于锡液具有极好的流动性和浮法玻璃成型工艺的特殊性,对锡槽槽体焊缝质量和锡槽槽底钢板平面度都有着极高要求。槽底钢板面积约350m^2,平面度要求为1．5mm,是锡槽制作技术难点。在锡槽制造过程中,槽底钢板制作和调整方法,直接影响锡槽钢结构制作和安装工期、劳动强度和制造质量。     

Adhesive bonding of RIM urethane

Two techniques for bonding reaction injection moulded urethane to itself and to other substrates are described. For in-mould bonding, details of substrate preparation, choice of adhesive and processing conditions are given. Where the geometry of the parts is complex, the structural bonding of individually moulded components has to be carried out: the development and properties of a two-part urethane adhesive designed for this purpose are detailed.     

Adhesive bonding of acetylated wood

Eighteen thermoplastic and thermosetting adhesives, including emulsion polymer-isocyanates, polyurethane, moisture-curing hot-melt, polyvinyl acetates, neoprene and waterborn contacts, casein, epoxy, melamine, ureas, resorcinol, phenol-resorcinols, and phenolics, were tested for their adhesion to yellow-poplar wood acetylated to 0, 8, 14 and 20 weight percent gains. Effectiveness of adhesion was determined by measuring shear strength and wood failure in a dry condition and after saturation with water. Adhesion was reduced to varying degrees in proportion to the compatibility of the adhesive with the amount of non-pollar, hydrophobic acetate groups in the acetylated wood. Seven of the adhesives developed bonds of high integrity at all levels of acetylation when tested in the dry condition. Two room-temperature-setting adhesives, one a resorcinol-formaldehyde and the other a phenol-resorcinol-formaldehyde, together with a hot-setting acid-catalysed phenol-formaldehyde, developed bonds of high strength and resulted in wood failure at all levels of acetylation when tested in the water-saturated condition.