Special heavy-duty anti-corrosion powder coating for steel bar coating

Abstract

The invention relates to a special heavy-duty anti-corrosion powder coating for steel bar coating. Its raw material components and parts by weight are: 700-800 parts of epoxy resin; 5-10 parts of curing agent; 50-60 parts of pigment; 170 parts of filler -190 parts; 20-40 parts of additives; add the above materials to a high-speed mixer, add them to an extruder after dry mixing, and melt, knead, cool, and tablet at an extrusion temperature of 90-100 ° C. After being pulverized, classified, sieved, and packaged by a pulverizer, it becomes a finished product of powder coating. The special heavy-duty anti-corrosion powder coating for steel bars prepared by the present invention is mainly used in railways, highways, bridges, basements of high-rise buildings, underground garages, seaports, wharves, dams, sewage treatment pools, chemical industries and other industries that require heavy anti-corrosion. The stability of steel bars can prolong the final service life of buildings for more than 30 years. Experiments have proved that the corrosion resistance of steel bars coated with epoxy coating is 800 times higher than that of bare steel bars.

Description

technical field [0001] The invention belongs to the field of coatings, in particular to a special heavy-duty anti-corrosion powder coating for steel bar coating. Background technique [0002] The stability of the performance of steel bars is directly related to the final service life of the building. Due to the existence of gaps or voids in the reinforced concrete, corrosion of the steel bars of the reinforced concrete will be caused when it is eroded by salt water or acid rain. The iron oxide scale produced by rust expands dozens of times in volume, which can cause concrete to crack and the protective layer to peel off. The steel bar is directly exposed to the atmosphere, water and its corrosive medium, and the corrosion rate is accelerated. Corrosion of steel bars can cause catastrophic accidents in engineering, and people's attention has been paid to the corrosion protection of steel bars. [0003] Epoxy-coated steel bars are an important method to solve the corrosion of...

AI Technical Summary

Problems solved by technology

The flexibility, adhesion, and internal stress of the steel coating are contradictory and unified, and it is not easy to balance it. Often the bending toughness is good but the adhesion will be poor. The electron microscope shows that the porosity of the section is high, and the permeability resistance is not very good, especially after a hot water bath. Adhesion will decrease

[0004] There have been nearly 30 years in foreign countries in the application of epoxy heavy-duty anti-corrosion of steel bars, but domestic applications have not been widely promoted. Some domestic anti-corrosion products cannot meet the harsh conditions of steel bar coating, especially in the process of bending and forming after coating , easy to crack or even peel off, many projects still use exposed steel bars to pour concrete directly, and the buildings are damaged before they reach the end of their service life, so domestic steel bars coated with powder coatings have been relying on imports in recent years

[0005] The coating should be resistant to chemical corrosion, impact resistance, chloride penetration resistance, bending resistance, cathodic disbonding resistance, strong bond strength, and fast curing. Commonly used powder coating materials obviously cannot meet these stringent requirements

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