Why are there bubbles after the filter glue is cured?

Many manufacturers of high-efficiency filters use glue that may have bubbles after curing. So why is this? There are two types of bubbles, small bubbles and large bubbles.

Actually, Most glues that are prone to small bubbles and pitting have a relatively high viscosity, that is, Generally, glue is used in the glue insertion process. So here we will briefly introduce what the glue insertion process is. The filter sizing process is generally divided into two types, namely gluing and inserting. The glue is Put the filter paper into the aluminum tank first, then inject glue, and wait for the glue to solidify before injecting the other side, Glue demand for glue injection production Generally requiredThe liquidity is better and the response speed is betterFaster, glue with this performance is generally more expensive. Glue insertYesPour the mixed glue first into the aluminum slot, and then insert the filter paper into the aluminum slot,Glue insertion method affects the fluidity of glue‘s requirements will be lower, and this type of glue is generally cheaper. Insert glueComponent A has a relatively high viscosity. During the production and discharging process, bubbles are generated by collision with the air in the barrel. In addition, there is a certain space in the upper part of the barrel. Bubbles will also be generated due to impact during handling or transportation. The system viscosity is high. Due to resistance, it is difficult for bubbles to float to the surface of the liquid and cause rupture. They will always exist in the liquid, resulting in small pinhole bubbles during use. Therefore, you need to be careful not to carry it multiple times during use, and use it as soon as possible after opening to avoid air entry.

So, if big bubbles appear, There are two main reasons. The first may be due to the accumulation of small bubbles. The reasons for the formation of small bubbles are also described above. The second may be caused by the glue. When water is mixed in, isocyanate reacts with water to produce carbon dioxide gas, causing glue foaming (the reaction mechanism is shown in the figure below.�, especially during the rainy season, special attention needs to be paid to keeping the environment dry. If there are other reasons, they need to be analyzed separately based on the specific circumstances.

Weigu two-componentFilterab glue uses high-quality raw materials, has good water resistance, will not produce bubbles, and has a white and smooth appearance. In addition, alsoWithHigh bonding strength, good fluidity, fast solidification, no irritating gasWei,Stability, resistanceOldhuaetc.Features. Suitable for bonding, filling and sealing between metal materials such as plated plates, aluminum plates, non-passivated stainless steel plates and non-woven fabrics, filter paper and other materials; productionproductMainly used inYesPartition, no partition, FFU , V medium and high efficiency filters, dust removal cartridges and other products. Finished productComply with ROHS, REACH and other test standards span>.