1, Automobile filter classification composition and bonding problems
A car usually needs four sets of filters: engine air filter, oil filter, fuel filter, air conditioner air filter, that is, we usually say four filters. They are responsible for the engine intake system, lubrication system, fuel system, air conditioning system intermediate filtration. The components of the filter need to be bonded with adhesives to ensure that the intake and outlet channels are completely isolated by filter paper, so as to filter impurities in the medium and protect the engine intake system, lubrication system, fuel system and air conditioning system. With the development of the automobile market, there are more and more types of models, among which the filter is more and more diverse, there are round barrels, plate types, irregular types, etc., large trucks usually use round barrels, and cars, SUVs are usually plate types. The bonding of automobile filter is mainly in filter paper folding, tooth ridge glue line (fixed tooth type glue), end cap bonding, filter paper joint, sealing ring bonding, border bonding and so on.
2, The main types and characteristics of adhesives used in automotive filters
The adhesive used for automobile filter is divided according to whether it contains solvent, solvent adhesive, solventless adhesive, hot melt adhesive, etc. According to the main composition, it can be divided into PU glue, PVC glue, EVA glue, PO glue, PA glue, epoxy glue, etc. According to the use is divided into end cap glue, filter glue, joint glue, glue line glue, casting glue and so on. In the past, general motors filter adhesives mainly have a single-component filter cartridge with PVC as the main body, and a two-component filter cartridge with polyurethane as the main body. At present, the filter glue used in the market is more complex, there are two-component PU glue, single-component PVC glue, EVA hot melt glue, PA hot melt glue, PO hot melt glue, epoxy glue, acrylic glue and so on. Because of its 100% solid content, no solvent, environmental protection, non-toxic, low odor, strong adhesion, good weather resistance, high cohesion strength, fast curing, suitable for automation and other characteristics, hot melt adhesive is widely used in the adhesive attachment of various parts of the filter. Two-component PU adhesive because of easy casting, simple process, non-toxic and environmental protection, can replace the metal end cap, so that the filter is more beautiful, more lightweight, and is also widely used in the adhesion of the filter components.
3, the development process and future direction of adhesives for automotive filters
With the great development of the automotive industry, adhesives for automotive filters have also developed. With the requirements of lightweight, dryness and vibration reduction, low emission, low VOC, and low odor in the automotive industry, the glue used in automotive filters has also had some new characteristics and development directions. From the initial single product development to now a rich and diverse product line. With the development of the filter industry, its filter adhesive in terms of performance, bond strength is getting higher and higher, odor is getting lower and lower, operation is getting easier and easier, curing is getting faster and faster, more suitable for automation, and higher high temperature resistance and lower low temperature resistance. The filter element produced by injection molding machine into the mold has the advantages of low height, lightweight and beautiful appearance, high filtration efficiency and long service life, which has become the main form of car air filter element, and is also widely used in mini-cars, passenger trucks and light vehicles. Hot melt, because it has the characteristics of non-toxic, rapid curing, and extensive bonding surface, is the development direction of adhesives used in the filter industry. Some functional filter adhesives are also the direction of future development.
