A article to understand the key points of epoxy glue coating

The coating is the appropriate method and tool to apply epoxy resin glue to the surface of the adhesive. Whether the glue is correct or not has a great influence on the bonding quality.
Epoxy resin adhesive coating is difficult to have a lot to do with the size of the viscosity, for solvent-free epoxy resin glue if its own viscosity is too large, or because the temperature is low becomes viscous, and cause difficulty in coating, can be the surface of the adhesive by electric hair drying or other means of preheat, preheated to 40 to 50 degrees C, so that the applied epoxy resin glue viscosity is reduced, easy to moisten the viscous surfaceIf it is solvent-based epoxy resin glue, sticky too large, can be diluted with the corresponding solvent and then coated, conducive to moisture.
(1) the number of times
the number of times the glue is applied varies according to the properties of epoxy resin glue and the adhesive. Like solvent-free epoxy glue and dense adhesive, generally coated once the glue can be, and most solvent-based epoxy resin glue and porous adhesive or require a certain thickness of the glue layer construction, need to apply glue 2 to 3 times. For multi-time glue. Be sure to do the next brush after the first time the glue table is dry, don't rush.
(2) the amount of glue
the amount of glue is also related to the variety of epoxy resin glue and the type of adhesive. The amount of glue applied to the porous viscose is greater. 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. So. 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.
(3) the method of applying
the method of applying glue varies according to the shape of epoxy resin glue. For liquid, paste or paste epoxy resin glue can be brushed, sprayed, impregnated, scraped, rolled, injected, etc.
(1) brush coating method
method is to apply the glue to the surface of the viscous with a brush. Brush coating method is suitable for painting any shape of the surface, for the transformer iron core insulated black paint LD-2055, brush glue should follow a direction, do not go back and forth, slower, so as not to bring in bubbles.
(2) spray method
this method is a special spray gun, with the help of dry compressed air, the glue sprayed to the bonding surface, spraying is characterized by uniform thickness of the glue layer, high production efficiency, suitable for large-area bonding. For large area pool waterproof products - Liding waterproof paint construction process, can be carried out by spraying construction.
(3) immersion method
which is a process of immersion of adhesive into an epoxy solution. For the immersion of epoxy resin glue, mostly used in LD-401/LD-401-C and other insulation paint applications, through coils in the glue or drip immersion, to achieve insulation paint coil gap filled, play the role of insulation, sealing. Immersion method is suitable for small, thin, complex adhesives, the advantages of which are simple equipment, less glue consumption, high production efficiency. Immersion method is commonly used in manual method, swing immersion method, centrifugal immersion method, vacuum immersion method, transmission immersion method and so on.
(4) scraping method
which is a scraper plate that scrapes paste or paste-like epoxy glue on the bonded and sealed area. For Liding viscose steel glue can be through the scraping process, the paste-like structure glue evenly coated on the surface to be bonded, after late bonding -curing can achieve the purpose of structural reinforcement.
(5) rolling coating method
This method is the use of rollers first immersed in the glue, and then transferred to the required bonding or coating surface, in the wide flat object surface coating, with the rubber roller operation is more convenient, rolling film is more uniform, no hanging phenomenon, but the corner is not easy to roll to, need to brush with a brush. Construction product range includes: waterproof paint, color road glue, ground insulation paint and so on.
(6) Injection Method
This method is to inject epoxy resin glue through a special container, using manual, mechanical, pneumatic and other pressure into the seams, pending state or components that need to be sealed, etc. For example, with 50 ml of LD-EP706 or 400 ml of Liding gum, through the plastic tube packaging, the later can be directly through the glue nodding machine or glue gun glue, not only can reduce the late stirring process, but also can improve the curing surface effect, speed up production speed.
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 epoxy resin glue is too large, it can be improved by heating or formula to reduce the viscosity, improve the epoxy adhesive immersion, penetration performance, so as to ensure the bonding strength. 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.
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