Epoxy resin-coated steel bar production: Unlike the usual epoxy resin coating on the surface of the steel bar, the epoxy resin-coated steel bar is produced by electrostatic powder spraying, which is coated on the surface of the steel bar in the factory.

The United States has tested 56 kinds of coating materials, and finally selected this thermosetting electrostatic spray epoxy powder coating material and manufacturing process.

Bonding force and influence on concrete gripping force: The unique properties of the epoxy resin powder and the electrostatic spraying process can ensure the good adhesion of the coating and the base steel bar, good tensile and bending resistance, and a short radius of 180° bending, There are still no cracks, which is difficult to achieve with other coatings.

It is important that the epoxy resin-coated steel and concrete have the smallest drop in grip strength (relevant standards allow a reduction of 10%), while other coatings may significantly reduce grip strength (even more than 50%) It is stipulated that the surface of the steel bar cannot be coated with a coating, etc., because the general coating can significantly reduce the grip force between the steel bar and the concrete).

Epoxy powder coating also has the following properties: a. Alkali resistance. Can withstand the high alkaline environment of concrete for a long time (pH=12.5～13.5); b. Resistant to chemical attack.

Because the epoxy resin powder coating has high chemical stability and corrosion resistance, and the film layer is impermeable, it can prevent water, oxygen, chloride salts and other corrosive media from contacting the steel; c. elasticity and friction resistance Are all good.

Epoxy resin-coated steel bars have many advantages and advantages. As a new technology, they have been rapidly developed abroad. However, problems and deficiencies have also been found in use, resulting in engineering accidents.

In addition to the quality of the project, it is also found that there are quality problems and problems in the use of epoxy resin coated steel bars. The main problem is whether the integrity of the epoxy coating on the steel bars can be guaranteed.