Experimental formula of modified epoxy heavy-duty anticorrosive powder coating (1 of 3)

In recent years, powder coatings have been rapidly popularized and applied in the field of heavy corrosion protection, especially in the field of pipeline heavy corrosion protection, because of its safety, high efficiency and no pollution. From the beginning, the anti-corrosion of oil and gas pipelines is extended to the anti-corrosion of urban underground sewage pipe network, and further extended to the anti-corrosion coating of building reinforcement and steel cables. Although the output value of powder coatings in China is now very huge, the primary thing is decorative powder coatings. Few powder coatings are really satisfied with heavy-duty anti-corrosion functions, especially rapid curing heavy-duty anti-corrosion powder coatings.

In this paper, the formula design of modified epoxy heavy-duty anti-corrosion powder coating is carried out in detail, the effects of various pigments, additives and other factors on the function of the film are described in detail, and the physical and mechanical functions and chemical corrosion resistance functions of the film are discussed.

1 experimental part

1.1 raw materials

Raw materials for heavy-duty anti-corrosion powder coatings: modified epoxy resin, epoxy resin, modified crosslinking agent, catalyst, titanium dioxide, wetting agent, precipitated barium sulfate, leveling agent, benzoin, active silicon powder and wax powder.

1.2 experimental equipment

Micro destruction machine, slj-30 melt extruder, vibrating screen (150 ~ 200 mesh), electrostatic spray gun and high temperature constant temperature oven.

1.3 coating and test plate preparation

1.3.1 coating preparation

The powder making process of modified heavy-duty anti-corrosion powder coating adopts the common melt mixing extrusion method. The mixed materials are subjected to high-temperature melt extrusion, tablet cooling, crushing, grinding damage, screening, and then electrostatic spraying.

1.3.2 test plate preparation

Weigh and mix the raw materials in strict accordance with the formula in Table 1, and extrude them with slj-30 extruder (the temperature in zone I is controlled at 105 ℃, the temperature in zone II is controlled at 110 ℃), the oven temperature is (230 ± 2) ℃, and the baking time is 90s.

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