不同表面处理方式对PEEK粘接强度的影响

采用砂纸打磨、喷砂和等离子处理等方式对PEEK进行表面处理,并使用环氧胶进行粘接。通过粗糙度仪、接触角测试仪和万能材料拉伸试验机对PEEK的粗糙度、润湿性和粘接强度等特性进行表征分析。结果表明,不同的表面处理方法对PEEK粘接的性能影响不同。砂纸打磨和喷砂能够有效增加PEEK表面的粗糙度,增大PEEK与粘结剂的粘接面积,从而提高PEEK的粘结强度。而等离子处理能够有效降低PEEK表面的接触角,改善PEEK表面的润湿性,提高PEEK的粘接强度,并且等离子处理后PEEK的粘接强度比未处理、砂纸打磨和喷砂分别提高了600%、260%和110%。     

ZN-1阻尼材料表面处理方式对粘接性能影响

为了改善ZN-1材料与硬铝的粘接性能,在采用环氧胶黏剂情况下,通过不同方式对橡胶材料表面进行了处理。研究表明,采用打磨、清洗橡胶表面的方式对提高粘接强度并无帮助,而采用172℃热风、K2Cr2O7-H2SO4溶液处理ZN-1材料,则可以使其与硬铝粘接强度达到橡胶本体破坏的程度。红外光谱及电镜扫描揭示,两种方式提高粘接强度的原因在于橡胶材料表面粗糙度增大,而K2Cr2O7-H2SO4溶液处理还提高了材料表面的含氧官能团,因此可以获得2.0MPa以上的粘接强度。     

聚氨酯胶粘剂对木材胶接机理研究I——机械互锁作用对粘接强度的影响

用光滑及砂纸打磨的高密度聚乙烯(HDPE)板模拟木材,用聚氨酯胶粘剂粘接PE板,测出PE胶合板的粘接强度,用表面粗糙的PE胶合板的胶接强度减去表面光滑的PE胶合板的粘接强度.得到机械互锁作用的粘接强度及机械互锁作用对胶接强度的贡献.结果表明,粘接强度随PE板表面粗糙度的增大而增加,揭示了胶接的机械互锁作用机理.     

聚氨酯胶粘剂对木材胶接机理研究Ⅰ——机械互锁作用对粘接强度的影响

用光滑及砂纸打磨的高密度聚乙烯（HDPE）板模拟木材,用聚氨酯胶粘剂粘接PE板,测出PE胶合板的粘接强度,用表面粗糙的PE胶合板的胶接强度减去表面光滑的PE胶合板的粘接强度,得到机械互锁作用的粘接强度及机械互锁作用对胶接强度的贡献。结果表明,粘接强度随PE板表面粗糙度的增大而增加,揭示了胶接的机械互锁作用机理。     

不锈钢零件表面浸镍处理与无机粘接

氧化铜无机胶粘剂用于一般钢材之间及磁钢与钢材之间的粘接。对其被粘接表面用砂纸打磨除锈、有机溶剂去油处理后,粘接效果良好,强度均能满足加工工艺和技术条件要求。但对不锈钢零件的被粘表面必须进行特殊处理才能提高粘接强度。为了充分发挥无机粘接的长处,在不锈钢被粘接表面用螺纹车刀加工出三道不连续的深0.2毫米的沟槽,在螺纹套被粘接表面加     

丙烯酸增强改性RTV有机硅橡胶胶粘剂

中国工程物理研究院科研人员采用丙烯酸增强改性10 7有机硅橡胶胶粘剂获得成功,选前述主原料、偶联剂预处理填料,并适当选择钛酸丁酯与KH - 5 5 0混配及高分子材料等,经有关技术处理,制得丙烯酸改性RTV有机硅橡胶增强型胶粘剂。实验测知,经改性该胶粘剂对铝材粘接后剪切强度提高到4～5MPa。丙烯酸增强改性RTV有机硅橡胶胶粘剂     

有机硅烷偶联剂对丙烯酸酯胶粘剂粘接作用的研究

利用剪切粘接强度、SEM等方法 ,考察了有机硅烷偶联剂的种类和处理方法对丙烯酸酯类胶粘剂 ,粘接强度的影响。结果表明 :将偶联剂KH - 570预处理物体表面及掺入乳液、适当高的固化温度都能显著地提高粘接强度。     

硅橡胶与金属钢热硫化粘接研究

为了实现较高粘接强度和易操作的硅橡胶与金属钢的热硫化粘接,研究了胶粘剂成分、金属试片的处理方式和硅橡胶配方对粘接性能的影响。结果表明,采用p H值为8.5的胶粘剂溶液,可以获得较高的粘接强度,采用含有机钛类催化剂和过氧化物催化剂的胶粘剂C,可以使甲基乙烯基硅橡胶(110-2)和苯基硅橡胶(120-1)的粘接强度提高到3.0 MPa以上;使用180μm(80目)和120μm(120目)的砂纸打磨金属试片,均可达到橡胶内聚破坏;硅烷偶联剂与硅橡胶共混,可适当提高粘接强度,但硅橡胶硬度增加较快,出现部分脆性撕裂,且试验件脱模处理困难;随着改性白炭黑含量的增加,110-2拉伸强度增大,剪切强度最大可接近4.0 MPa,提高了硅橡胶与金属热硫化粘接的强度和可靠性。     

砂基透水材料的研究

对风积沙进行物理焙烧和化学覆膜表面处理后,采用亲水性的环氧树脂为胶粘剂及自制的反应型环氧表面活性剂将风积沙粘接制成透水材料。通过红外光谱、压缩强度和透水系数测试研究了粘接树脂的组成,风积沙不同表面改性方法,胶粘剂用量,砂粒大小及分布对透水材料性能的影响,并通过扫描电镜对透水材料的微观结构进行了观察。结果表明,风积沙经焙烧处理后,使用同等树脂量粘接的样品,干压缩强度和湿压缩强度分别提高0.5倍和1倍左右;焙烧后的风积沙经覆膜处理后,强度分别提高0.2倍和0.5倍以上。     

表面处理对硅橡胶胶粘剂胶接性能的影响

本文着重研究了不同表面处理条件下硅橡胶胶粘剂的粘接性能。有机硅烷偶联剂对提高硅橡胶胶粘剂的粘接性能有显著效果,其中以GPJ－43的处理效果为最佳。铝合金试样机械打磨后采用不同溶剂清洗对粘接性能也有影响,其中以三氯乙烯的效果为最好。磷酸阳极化是很有效的表现处理方法。对铝－铝粘接界面的分析发现,硅橡胶胶粘剂粘接接头的破坏一般为胶粘剂的内聚破坏或胶粘剂与偶联剂界面的粘附破坏。     

核-壳粒子和液体橡胶增韧环氧胶粘剂的研究

采用丙烯酸酯核-壳粒子和液体橡胶分别增韧改性环氧树脂胶粘剂,探讨了2种增韧体系对冲击强度和粘接强度的影响。研究发现,核-壳粒子在用量较少的情况下可获得比液体橡胶更优异的冲击强度和粘接强度,剥离强度达到10 kN/m以上。通过SEM观察改性环氧树脂断裂表面的微观形貌,并通过TEM进一步观察核-壳粒子增韧环氧树脂的分散状态,探讨微观形态与冲击强度和粘接强度之间的关系。     

环氧树脂胶粘剂工程应用研究

采用某种型号的环氧树脂(EP)胶粘剂胶接LY12-CZ铝合金试片,在110～170℃范围内加热4 h后测定胶接件的剪切强度,并对该胶接件的不同加载速率与拉伸剪切强度的关系进行了研究。结果表明:短时高温加热对该胶粘剂的剪切强度没有影响,这有利于飞机组件的整体修复;拉伸剪切强度随着加载速率的增加而增大,这又为探讨加载速率对不同胶粘剂性能的影响提供了试验依据。     

碳纤维表面性能对界面黏结强度的影响浅析

为了解碳纤维表面性能对纤维-树脂界面黏结强度的影响,使用扫描电镜、原子力显微镜与X射线光电子能谱仪(XPS),对国产T-300级碳纤维、台丽TC36S碳纤维、东丽T700S碳纤维的表面进行物理与化学表征,得出:国产碳纤维与TC36S碳纤维表面形貌相近,而T700S表面比较光滑;XPS定量分析技术表明3种碳纤维表面的活性差异较大,碳纤维与树脂的界面黏结强度随纤维粗糙度和表面活性官能团而变化。     

Solvent presence and its impact on the lap-shear strength of SDS-decorated graphene hybrid electrically conductive adhesives

The mechanical bonding strength of electrically conductive adhesives (ECAs), as well as the impact of residual solvent on the bonding strength was investigated between a copper clad FR-4 surface and conductive adhesives using Lap-shear testing. Both solvent-free and solvent-assisted formulations with various filler concentrations of silver (Ag) and sodium dodecyl sulfate (SDS)-decorated graphene (Gr(s)) in epoxy matrices were prepared and compared. It was found that the introduction of 0.75 wt% Gr(s) in solvent-free formulations increased the Lap-shear strength (LSS), while the combination of ethanol solvent and SDS in solvent-assisted formulations significantly decreased the LSS. In addition, it was found that increasing the Ag content generally lowers the LSS for both the solvent-free and solvent-assisted formulations. By examining the structure and interface of both formulations using optical microscopy, surface profilometry and SEM, we found that the solvent-assisted formulations exhibit more voids at the surface of the paste and more bubble formation throughout the material compared to the solvent-free formulations. Therefore, the significant drops of LSS in solvent-assisted Gr(s)-filled formulations may be attributed to the formation of bubbles at the micron range during the curing process.     

Surface Modification of Epoxy Resin with Silicone-containing Block Copolymers

In order to improve oil and water repellency, silicone-containing block copolymers, composed of methylmethacrylate (MMA), glycidylmethacrylate (GMA), and polydimethylsiloxanemethacrylate (SMA), were blended in an epoxy resin. It was expected that the low surface energy dimethylsiloxane segments would adsorb and orient at the exterior of the resin to make a thin surface phase and the glycidyl groups would mesh with the epoxy resin by primary bonding. The techniques of X-ray photoelectron spectroscopy (ESCA), dynamic contact angle (DCA) and peel strength measurements of pressure sensitive adhesives were used to characterize the modified epoxy resin surface phases. The amount of Si_2p obtained via angular dependent ESCA investigation in the near surface region of the modified resin increased with decreasing sampling depth. With an increase in modifier content, both the amount of Si_2p and O_1s also increased. Both advancing and receding contact angles for an aluminum plate coated with modified resin, measured by dipping into and out of water, increased with the addition of these modifiers. The peel strength of a pressure sensitive adhesive tape affixed to the modified epoxy resin decreased dramatically with increasing modifier content. It was found that these copolymers were good surface modifiers to improve oil and water repellency and that they acted as release agents.     

玻璃纤维增强复合材料筋材连接试验研究

本文通过实验研究了由两种不同的粘结材料对玻璃纤维增强复合材料(GFRP)筋材的连接特性。研究表明采用环氧类树脂粘结剂进行钢套管和GFRP筋的连接,技术可行;环氧类树脂粘结剂的粘结滑移关系曲线上升段具有双折线特性。依据粘结滑移关系曲线,建议粘结强度设计值以屈服强度或控制变形量为确定标准,本试验建议取粘结极限强度的50%。提出了选择粘结剂的指标和温度影响、各种环境介质对其粘结性能劣化的影响试验要求。     

Surface Modification of Epoxy Resin with Silicone-containing Block Copolymers

In order to improve oil and water repellency, silicone-containing block copolymers, composed of methylmethacrylate (MMA), glycidylmethacrylate (GMA), and polydimethylsiloxanemethacrylate (SMA), were blended in an epoxy resin. It was expected that the low surface energy dimethylsiloxane segments would adsorb and orient at the exterior of the resin to make a thin surface phase and the glycidyl groups would mesh with the epoxy resin by primary bonding. The techniques of X-ray photoelectron spectroscopy (ESCA), dynamic contact angle (DCA) and peel strength measurements of pressure sensitive adhesives were used to characterize the modified epoxy resin surface phases. The amount of Si_2p obtained via angular dependent ESCA investigation in the near surface region of the modified resin increased with decreasing sampling depth. With an increase in modifier content, both the amount of Si_2p and O_1s also increased. Both advancing and receding contact angles for an aluminum plate coated with modified resin, measured by dipping into and out of water, increased with the addition of these modifiers. The peel strength of a pressure sensitive adhesive tape affixed to the modified epoxy resin decreased dramatically with increasing modifier content. It was found that these copolymers were good surface modifiers to improve oil and water repellency and that they acted as release agents.     

高性能活性丙烯酸酯低聚物改性环氧胶粘剂

通过溶液聚合方法合成一种含环氧基的丙烯酸酯低聚物,用以改性环氧树脂胶粘剂。研究表明,通过调整主链结构中各单体的配比以及低聚物用量,特别是加入含环氧基的活性丙烯酸酯单体,使其聚合在主链结构中,通过固化反应与主体结构可形成化学键。这种胶粘剂在耐热性能不下降的前提下室温剪切强度和剥离强度均有提高。通过扫描电镜观察断裂表面的微观结构．探讨了粘接性能与微观结构的关系。