Fired epoxy powder coating special for hot rolling coating of large-caliber steel pipes

Abstract

The invention relates to a fired epoxy powder coating special for hot rolling coating of large-caliber steel pipes, which includes formula raw materials, by weight, 400-500 parts of bisphenol A-type epoxy resin, 50-60 parts of phenolic aldehyde modified epoxy resin, 50-99 parts of curing agent, 0.5-1 part of catalyst, 50-100 parts of wear-resistant damping filler, 190-240 parts of corrosion-resistant pigment and filler and 30-50 parts of auxiliaries. The preparation method of the fired epoxy powder coating includes, adding the above raw materials into a high-speed mixer, adding to an extruder after dry mixing, fusing, mixing, cooling and preforming at extrusion temperature ranging from 80 DEG C to 90 DEG C, crushing by a crusher, classifying, screening and packaging to be the powder coating. After being used by users and detected by relative authorized departments, the fired epoxy powder coating special for hot rolling coating of large-caliber steel pipes excellent in corrosion resistance is excellent in coating efficiency and corrosion resistance, indexes thereof can meet those of the-like imported products, some of the indexes even exceed those of foreign products, and price is superior to that of the imported products. In addition, the fired epoxy powder coating special for hot rolling coating of large-caliber steel pipes is deeply appreciated by the users.

Description

technical field [0001] The invention belongs to the field of coatings, and in particular relates to a fusion bonded epoxy powder coating specially used for thermal rolling coating of large-diameter steel pipes. Background technique [0002] Since the reform and opening up, foreign advanced technologies have been gradually introduced into the mainland, and PE plastic-coated steel pipes and plastic-lined steel pipes have been introduced. Recently, various heavy-duty anti-corrosion powder coating steel pipes have been gradually developed and produced in China. The thermoplastic PE powder coatings currently used have a molecular weight of more than 10,000, and most of them are linear molecules with few and weak molecular polar bonds, so the adhesion to the substrate is poor; while the molecular weight of thermosetting pure epoxy heavy-duty anti-corrosion powder is high. At 1500-3000, the molecule is small, and it is easy to infiltrate into the recesses after "shot blasting" or "...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to overcome the disadvantages of low coating efficiency and poor coating effect in coating large-diameter steel pipes with conventional paints and ordinary powder coatings, and provide a fusion-bonded epoxy powder coating special for thermal roll coating of large-diameter steel pipes. , the coating has a durable coating with drag-reducing and anti-corrosion properties, and can be thickly coated at one time, and the construction is simple, which solves the problems of low thermal coating efficiency and high energy consumption of large-diameter steel pipes

Images