Curing temperature
The curing temperature is one of the important parameters when the adhesive is cured. If the curing temperature is too high, it will easily cause the loss of glue or to embrittle the adhesive layer, resulting in a decrease in the bonding strength. If the curing temperature is too low, the molecular chain movement of the matrix is difficult , leads low density of crosslinking adhesive layer ,causing uncompleted curing reaction .Therefore, ,the curing temperature must be strictly controlled during the curing process, and each adhesive has a specific curing temperature.
Curing pressure
Curing pressure means that a certain pressure is applied during the curing process, which is good for the glue layer to be adhered to the adherend and ensure the quality. Due to the different types of glue, the applied pressure is also different, generally divided into the following three situations: contact pressure is It is cured by the pressure generated by the weight of the adherend without additional pressure, such as epoxy resin adhesive, a-cyanoacrylate adhesive, second-generation acrylic adhesive, unsaturated polyester adhesive and polyurethane adhesive, etc. . The pressure of 0.1 ~ 0.3MPa is suitable for solvent-based adhesives, such as phenolic acetal adhesive, phenolic nitrile adhesive, epoxy-nitrile adhesive, epoxy-nylon adhesive and polyimide adhesive. 0.3 ~ 0.5MPa pressure is suitable for film, powder, tube and granular adhesives, as well as hot melt adhesives. The purpose of increasing the pressure is to improve its wettability.
Curing time
The curing time refers to the time required for curing during the bonding process under certain temperature and pressure conditions.
Different adhesives have different curing time, such as instant curing, a-cyanoacrylate adhesive, hot melt adhesive curing in a few hours, such as room temperature fast curing epoxy adhesive, second-generation acrylate adhesive, there are up to Only cured in a few days, such as epoxy polyamide glue.
The curing time is also affected by the curing temperature and pressure. Increasing the curing temperature can shorten the curing time. Under lower curing temperature conditions, the curing time should be greatly extended. If it is below room temperature, it may not cure for a few days.to sum up
Conclusion
Although the quality of the adhesive is important, the factors of curing can not be ignored. No matter how good an adhesive is, if the curing temperature, pressure and time are not taken into account, the adhesive performance of the adhesive is very large.
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