Views:0 Author:Site Editor Publish Time: 2019-10-16 Origin:Site
Epoxy resin composite steel pipe is widely used in fire water supply. In the building fire protection system, epoxy steel pipe plays an important role and gradually replaces the galvanized steel pipe. Let us introduce the production process of the inner and outer coated epoxy steel pipe, the performance of the powder (epoxy resin), and the inside and outside. Product performance of epoxy coated steel pipes. When spraying, the epoxy resin powder is not completely fused to the inner and outer walls of the substrate. After 30 minutes of preheating and curing, the curing agent in the epoxy resin is completely cured, so that the coating of the inner and outer walls is more adhesive and thermosetting. The powder characteristics are fully apparent.
The epoxy resin composite steel pipe is a steel pipe based pipe, which is coated with plastic powder, and is coated with a plastic layer on its inner surface and a plastic layer or other material anti-corrosion layer on its outer surface. Steel-plastic composite products. Plastic coated steel pipes are classified into polyethylene coated steel pipes and epoxy resin coated steel pipes according to different inner coating materials. The product mark consists of a plastic coated composite steel pipe code, an inner coating material code and a nominal size. The water-lined plastic composite steel pipe is on the inner wall of the steel pipe, and is lined with plastic ethylene (PE), heat-resistant polyethylene (PE-RT), cross-linked polyethylene (PE-X), polypropylene (PP-R) according to the requirements of the conveying medium. It is made of thermoplastic pipes such as hard polyvinyl chloride (PVC-U) and chlorinated polyvinyl chloride (PVC-C).
The study of epoxy resins began in the 1930s. In 1934, P. Schlack of I.G. Farben, Germany, discovered that an amine compound can be used to polymerize a compound containing a plurality of epoxy groups into a polymer compound to form a plastic having a low shrinkage ratio, thereby obtaining a German patent. Later, Pierre Castan of Gebr.de Trey in Switzerland and SO Greelee of Devoe & Raynolds in the United States used polycondensation of bisphenol A and epichlorohydrin to obtain epoxy resin, using organic polyamines or phthalic anhydride. The resin can be cured and has excellent adhesion.
Epoxy resin also has some shortcomings, such as poor weather resistance. Epoxy resin generally contains aromatic ether bonds. The cured product is easily degraded and broken after being exposed to sunlight, so the usual bisphenol A epoxy resin cured product is exposed to the sun. It is easy to lose luster and gradually chalks, so it should not be used as an outdoor finish. In addition, epoxy resin has poor low-temperature curing performance, generally needs to be cured above 10 °C, and curing is slow below 10 °C, which is very inconvenient for large objects such as ships, bridges, harbors, oil tanks and other cold seasons.