Experimental formula of modified epoxy heavy-duty anticorrosive powder coating (3 of 3)

2.2 effect of catalyst dosage on physical and mechanical function of coating film

In the modified epoxy heavy-duty anticorrosive powder coating, the catalyst dimethyl imidazole is directly related to the film-forming degree of the film, and its increase has a great influence on the physical and mechanical functions of the film.

2.3 influence of filler variety and dosage on medium resistance of film

2.3.1 influence of filler variety on medium resistance of coating

Precipitated barium sulfate, heavy calcium carbonate and active silicon powder were investigated.

2.4 effect of curing conditions on film

The baking time and temperature of the film have a great influence on the curing degree of the film.

2.5 influence of substrate on coating

In the spraying experiment, it is found that the modified epoxy heavy-duty anti-corrosion powder coating has good film and leveling function when spraying on the surface of tinplate, aluminum profile, galvanized steel and the inner and outer walls of pipes. However, when spraying on the surface of castings, porous substrates and components with disordered structure, the powder rate at the corners is low, and pinholes are easy to appear on the film surface.

In the experiment, through the selection of functional additives, especially after the use of porous substrate wetting agent, we not only improved the powder loading rate at the edges and corners, but also improved the appearance and various physical functions of the film.

3 physical and chemical function test

During the experiment, rutile titanium dioxide was used as pigment to test the physical and mechanical functions and chemical corrosion resistance of modified epoxy heavy-duty anti-corrosion powder coating at room temperature.

Note: all samples shall be tested after being placed in a constant temperature and humidity room for 24h, and shall be resistant to medium immersion for 90d

4 Conclusion

Modified epoxy heavy-duty anti-corrosion powder coating has excellent mechanical properties and chemical corrosion resistance. Its anti-corrosion performance is far better than the common anti-corrosion coatings in the current market. At the same time, it also has the characteristics of rapid curing, which is very suitable for the anti-corrosion application of steel bars, pipelines and other objects.

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