Author ：Iflowpower – Portable Power Station Supplier
Battery special epoxy sealing adhesive Important applied to lead-acid-free maintenance storage cells to bond and pole seal, divided into medium cover gel and pole glue. Medium cover plastic, sealed, sealant, capping glue to bonding the bonding seal between the battery slot cover and the battery shell; the pole column is also known as red black glue, red blue glue, terminal glue, marking glue, logo Glue seal sign for battery terminal positive and negative electrode. The seal between the battery shell cover is the key to the entire battery seal.
This is important because the contact area between the battery shell cover is large, the shape is complex, the rubber layer is directly contacted, and it is often collided with an external force, so shell The cover is easily leakage, leakage, in order to ensure that the groove cover and the battery housing are firmly bonded to the battery housing, and the medium cover should have good adhesive, acid resistance. Improve the adhesive sealing performance of the battery and the correct use of battery sealing gums is not open, so in the use process, in the use of the sealing glue, during the specific operation, the condition and epoxy surface of the battery bonding surface Whether the ratio of resin glue, the curing temperature, the rubber process, etc. correctly handles the bonding performance of the final achievement of glue has a direct impact.
First, the contact surface treatment of the cell cover, the housing, the surface of the cylinder is often easy to be protected from sweat, oil, dust, etc., and the surface of the ABS, PP or regenerated plastic is released, during the use of sealant. , Use an organic solvent (acetone) to wash directly to the ABS housing and dry after drying.
Second, the mixing ratio of compared mixed bicomponent epoxy AB glue is determined according to the reaction mechanism, the ratio deviation is too much to cause an excess of a component to not complete or significantly reduce the bond strength thereof. The correct ratio method is that according to the weight ratio of the medium cover, it is not a volume ratio (not more than 3% of the error), which is fully stirred. When the a glue is low in the use of ambient temperature, there is a high viscosity is more difficult to stir well, and it is only preheated to reduce the viscosity, mixed with B glue, mixed with B, which is easier to stir Uniform, simultaneous stirring is equally important, if the ratio is accurate, if the mixture is not sufficient, it will often have a local unnecessary or sticky hand, and the result is that the bonding performance and the acid resistance are completely unable to meet the requirements.
It is recommended to use it when used. The machine is stirred, and the inner wall adhered to the rubber container is scraped and stirred during the intermediate mixing process to ensure that all glue can be mixed. Third, the epoxy resin adhesive used in the manufacturing process of curing temperature is belongs to the normal temperature curing system, but the curing speed and the effect are directly related to the ambient temperature.
The higher the temperature, the slower the temperature, the slower temperature, but when curing When the ambient temperature is less than 15 ¡ã C, the time required for curing is significantly longer, the crosslinking density of the rubber layer is low, the curing reaction is incomplete, and the range of extended curing time and the curing temperature are not equivalent, and the curing temperature is difficult to use Extension time to compensate, since the inside of the adhesive and the complete glue chemical reaction occurs between the surface of the adhesive surface can be carried out, so heating curing is the best choice in a low temperature environment, and heating can also soften the rubber layer. In the case of infiltration of the surface of the substrate, it is conducive to the molecular motion, find a partner of the molecular use force on the bonding interface, so heating is also advantageous to increase the adhesive force, but the curing temperature is too high, which is easy to cause gum loss or Elastic embarrametization, resulting in lower glue strength. Heating method has an oven or bake, drying room heating, etc.
The heating process should be gradually warmed, the heating temperature can generally be controlled around 40-60 ¡ã C. The convenience of considering operation is recommended to use the dried direct heating method, and the adhesive battery will leave the appropriate time (1h) in the heated biffway. Fourth, the amount of the glue amount is an important factor affecting the effect of curing effect.
There is a high degree of generosity in theory, and the adhesive surface is high when the rubber layer is thick, but the actual use is too Thick, especially in hot summer, the polymerization heat cannot be dispersed in time, and the colloidal temperature will cause expansion of bubbles in the glue, and the volatilization ingredients in the adhesive form bubbles in the rubber layer, which causes the glue to do not with the shell. The body is fully pasted to form an interfacial adhesion, thereby reducing the bonding performance of the product, and therefore, during the plant of the battery pole column, it is recommended to use a layered gel method, and the undercoat control is around 5-10mm, and the upper glue control is controlled. At 10 ~ 15mm, 5, the pole material of the lead-acid battery of the polar column is generally lead and lead alloys, and the battery housing is generally an ABS or PP, which requires good physical properties of epoxy resin themselves and has high strength.
, High toughness, acid resistance, fatigue resistance, etc., while two materials with metal and organic matter are good. In addition, the battery electrode negative electrode is more susceptible to the positive electrode.
The reason is that the positive electrode is in an oxidation state, and the surface is easily generated to generate a passivation layer, the reaction of the pole column and the sulfuric acid, so it is not easy to remove acid; while the negative electrode column is always in the reduction state, The extreme surface activity is high, easy to react with the acid mist, and simultaneously transform each other during the charge and discharge process, step by step. At present, there is a pole pillar of anti-clinic acid on the market. Its important feature is that there is a lot of threads on the pole entry, thereby achieving the effect of delaying clipping corrosion, effectively extending pole service life.
In summary, in the process of maintaining a lead-free product, an epoxy resin is used in the process of the cylindrical column, except for the epoxy resin sealing adhesive, it is necessary to have excellent bonding properties, acid resistance, and impact resistance. In addition, take the following steps to achieve the optimized adhesive curing effect to improve the storage of battery sealing propertie.
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