影响打胶机胶粘剂粘接强度的物理因素

发布时间:2019/04/17    发布人:

双组份打胶机在玻璃加工行业应用十分的广泛,而打胶机胶粘剂的粘接强度就是玻璃加工质量的关键,所以了解影响打胶机胶粘剂粘接强度的因素就显得尤为重要,小编在网上整理了大量的资料,接下来就为大家分析一下影响打胶机胶粘剂粘接强度的物理因素。
Two-component beater is widely used in glass processing industry, and the bonding strength of the adhesive is the key to the quality of glass processing, so it is particularly important to understand the factors affecting the bonding strength of the adhesive of the beater. A large amount of information has been compiled online, and then the physical factors affecting the bonding strength of the adhesive of the beater are analyzed.
1.外表粗糙度。当胶粘剂良好地浸润被粘资料外表时(接触角θ<90°),外表的粗糙化有利于进步胶粘剂液体对外表的浸润水平,增加胶粘剂与被粘资料的接触点密度,从而有利于进步粘接强度。反之,当胶粘剂对被粘资料浸润不良时(θ>90°),外表的粗糙化就不利于粘接强度的进步。
1. Surface roughness. When the adhesive saturates the surface of the bonded material well (contact angle is less than 90 degrees), the roughening of the surface is beneficial to the improvement of the wetting level of the adhesive liquid to the surface and the increase of the contact point density between the adhesive and the bonded material, which is conducive to the improvement of the bonding strength. Conversely, when the adhesives are poorly infiltrated with the adhesives (theta > 90 degrees), the roughening of the surface is not conducive to the improvement of the bonding strength.
2.外表处置。粘接前的外表处置是粘接胜利的关键,其目的是能取得结实耐久的接头。由于被粘资料存在氧化层(如锈蚀)、镀铬层、磷化层、脱模剂等构成的“弱边境层”,被粘物的外表处置将影响粘接强度。例如,聚乙烯外表可用热铬酸氧化处置而改善粘接强度,加热到70-80℃时处置1-5分钟,就会得到良好的可粘接外表,这种办法适用于聚乙烯板、厚壁管等。而聚乙烯薄膜用铬酸处置时,只能在常温下停止。
2. Appearance disposal. The appearance disposal before bonding is the key to the success of bonding, and its purpose is to obtain strong and durable joints. Due to the existence of "weak boundary layer" consisting of oxide layer (such as rust), chromium plating layer, phosphating layer and release agent, the surface disposal of the adhesives will affect the bonding strength. For example, the appearance of polyethylene can be treated by thermal chromic acid oxidation to improve the bonding strength. When heated to 70-80 C for 1-5 minutes, a good bondable appearance can be obtained. This method is suitable for polyethylene sheets, thick-walled pipes and so on. When polyethylene film is treated with chromic acid, it can only stop at room temperature.

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3.浸透。已粘接的接头,受环境氛围的作用,常常被渗进一些其他低分子物。例如,接头在湿润环境或水下,水分子浸透入胶层;聚合物胶层在有机溶剂中,溶剂分子浸透入聚合物中。低分子物的透入首先使胶层变形,然后进入胶层与被粘物界面。使胶层强度降低,从而招致粘接的毁坏。
3. soak. Bonded joints are often infiltrated into other low molecular weight substances due to the effect of environmental atmosphere. For example, in wet environment or underwater, water molecules are immersed in the adhesive layer; in organic solvents, solvent molecules are immersed in the polymer layer. The penetration of low molecular weight first deforms the adhesive layer and then enters the interface between the adhesive layer and the adhesives. It reduces the strength of the adhesive layer, which leads to the destruction of the bonding.
4.压力。在粘接时,向粘接面施以压力,使胶粘剂更容易充溢被粘体外表上的坑洞,以至流入深孔和毛细管中,减少粘接缺陷。关于黏度较小的胶粘剂,加压时会过度地流淌,形成缺胶。因而,应待粘度较大时再施加压力,也促使被粘体外表上的气体逸出,减少粘接区的气孔。
4. pressure. When bonding, pressure is applied to the bonding surface, which makes it easier for the adhesive to fill the holes on the surface of the bonded body, and even flow into deep holes and capillaries to reduce bonding defects. For adhesives with lower viscosity, excessive flow will occur under pressure, resulting in glue deficiency. Therefore, the pressure should be applied when the viscosity is high, which also promotes the gas escaping from the surface of the adhered body and reduces the stomata in the bonding zone.
6.胶层厚度。较厚的胶层易产生气泡、缺陷和早期断裂,因而应使胶层尽可能薄一些,以取得较高的粘接强度。另外,厚胶层在受热后的热收缩在界面区所形成的热应力也较大,更容易惹起接头毁坏。
6. Thickness of adhesive layer. Thicker adhesive layer is prone to bubble, defect and early fracture, so the adhesive layer should be as thin as possible to obtain higher bonding strength. In addition, the thermal stress formed by the thermal shrinkage of the thick rubber layer in the interface area after heating is also larger, which is more likely to cause joint damage.
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