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The difficulty of adhesive coating has a lot to do with the size of viscosity, for solvent-free adhesive if its viscosity is too large, or because the temperature is low becomes viscous, and cause coating difficulties, can be the surface of the adhesive by electric hair dryer preheat to 40 to 50 degrees C, so that the adhesive viscosity after coating is reduced, easy to moisten the viscosity surface. If it is solvent-based adhesive, sticky too large, can be diluted with the corresponding solvent and then coated, conducive to moisture.
the surface of the adhesive easily adsorbed air and moisture, in order to prevent the formation of air bubbles or pores, painting should move in one direction, the speed of the coating can not be too fast, in order to help the exclusion of air
Continental
. Generally two viscous surfaces should be glued.
01. The number of times the adhesive is applied varies depending on the nature of the adhesive and the adhesive
like solvent-free epoxy and dense adhesive, the glue can be applied once, and most solvent-based adhesives and porous adhesives, need to be applied 2 to 3 times.
for many times to apply glue, must be in the first time the solvent of the glue basically volatile before the next time to apply glue, can not be rushed.
02. The amount of glue applied is also related to the variety of adhesive and the type of viscous
The size of the amount of glue directly determines the thickness of the glue layer, the thinner the general glue layer, less defects, small deformation, small shrinkage, small internal stress, the higher the bonding strength, the glue layer should be thin not thick, the glue layer is too thick, not only unhelpful, but harmful. Therefore, under the premise of ensuring that there is no lack of glue, the glue layer as thin as possible is good. It is generally considered that it is appropriate to control the thickness of the glue layer from 0.08 to 0.15mm.
03. The method of applying glue varies depending on the shape of the adhesive
for liquid, paste or paste adhesive can be brushed, sprayed, soaked, injected, leaked, rolled, scraped, etc.; for the film can be applied before the solvent has fully evaporated or rolled; for hot melt adhesive can be directly sprinkled on the preheated surface of the adhesive, or with a special hot gun coating.
No matter what kind of glue method, should be carefully and meticulously carried out, the requirements of glue uniform, and avoid air mixing, and finally get no leakage, no lack of glue, no bubbles, no accumulation, bonding after the appropriate thickness of the glue layer. If the adhesive sticks too large, not only is not conducive to the coating, but also not easy to soak, penetration, difficult to ensure bonding performance, must be diluted with appropriate solvents before applying glue. As far as the coating surface is concerned, in principle, each viscous surface should be evenly coated to ensure adequate immersion, but for large areas, the strength requirements are not high bonding, can also be used dot coating, wire coating or dot, line coating and use the method of glue, so as to save both glue and labor.