At present, anti-corrosion steel pipes are mainly used in more important occasions, especially in petroleum, chemical, natural gas, thermal energy, water conservancy, roads, bridges, water conservancy, etc. Traditional solvent coatings have the following disadvantages: First, the formula is not environmentally friendly, polluting the environment; solvent The paint needs to be diluted and sprayed with solvents such as xylene. Xylene has a strong odor, is flammable, and is easy to cause harm to the human body. The spraying project is more harmful to the construction personnel and the surrounding environment. Second, the multi-layer spraying construction of the outer wall of the steel pipe is affected by the ambient temperature and the scene. , The assembly line is running, and the construction efficiency is low.
[0003] The 100% solid content rigid polyurethane anti-corrosion coating technology represents the development direction of the coating industry in the 21st century. The spraying technology is advanced, the quality is stable, the coating is cured quickly, the construction is convenient and fast, and the efficiency is high. It can be widely used in the anticorrosion of steel, cast iron, cement and other substrates.
100% solids polyurethane coatings typically consist of two components: a polyisocyanate solution and a polyol solution. When the two components are mixed, the reaction forms a polyurethane coating, a rapidly heated chemical polymerization process. "100% solids content" means that these resins are still in a liquid state under normal conditions and are 100% converted to a solid coating after coating without any solvent to dissolve.
Water pipelines are an important part of the survival and development of cities and industrial enterprises. In recent years, with the improvement of people's living standards, the expansion of urban scale and the development of industrial enterprises, long-distance and caliber water diversion and water delivery projects have been launched one after another. These projects have very high requirements on the pressure resistance of pipeline materials and the convenience of construction, so domestically mature and advanced welded steel pipes are generally used.
However, if steel pipes are in soil (groundwater) for a long time, they will be corroded by electrochemistry, stray current, bacteria, microorganisms, etc. As well as their own transport medium (water and dissolved oxygen in water, CO corrosion and wear, corrosion perforation (or fracture) may cause leakage, waste water resources, pollute living water quality, and even affect normal production and life.
At present, domestic and foreign anti-corrosion experts have achieved fruitful results in the theory and practice of underground water pipeline protection according to the different corrosion mechanisms of buried water pipes in the soil and the corrosion mechanism of the conveying medium, and developed many new technologies, new processes and new technologies. product. With the implementation of various anti-corrosion technologies, the service life and safety of the water pipeline are guaranteed, the secondary pollution of water is prevented, the water delivery capacity of the steel pipe is improved, and significant economic benefits have been achieved. In recent years, 100% solid solvent-free rigid polyurethane has been widely used in the anti-corrosion application of foreign water transmission steel pipes.