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internal and external epoxy powder anti-corrosion steel pipe plastic-coated steel pipe is now the most widely used steel pipe. it has both the advantages of plastic pipes and steel pipes. new product. plastic-coated steel pipe is a combination of plastic pipe and steel pipe. it can now be used in high-temperature or low-temperature environments, unlike plastic pipes that cannot be used in high-temperature environments, and plastic-coated steel pipes will not in case of rust and corrosion, its anti-corrosion performance has been further strengthened. at the same time, because the plastic-coated steel pipe has undergone a similar plastic-plating treatment on the surface of the steel pipe, this makes the plastic-coated steel pipe have good sealing performance. when used as a cable casing, the signal of the cable will not be interfered with by external signals at all. , is the main pipe material used for cable sleeves and plastic-coated steel pipes are often used as protective pipes for wires. although the name is still called steel pipes, it is completely insulated and will not cause leakage hazards. plastic-coated steel pipe is made of plastic combined with steel, but its compressive capacity has not been weakened, and it has also been strengthened to a certain extent. now the maximum compressive capacity can reach 6mpa. the use of internal and external epoxy powder anti-corrosion steel pipes and plastic-coated steel pipes is very common in our construction industry, mainly because this type of steel pipe has certain characteristics.
the inner and outer epoxy powder anti-corrosion steel pipe is a kind of coating with powder plastic as the main body, and its performance is basically determined by the performance of the main plastic. plastics can be divided into two categories: thermoplastics and thermosetting plastics according to their properties after being heated. thermoplastics are generally made of polymer resin as the basic component, adding a small amount of stabilizer, lubricant, or plasticizer (or not added). this type of plastic is characterized by softening after heating, has plasticity, and can be molded repeatedly. generally, thermoplastics have excellent chemical resistance, toughness, and elongation. commonly used thermoplastics are polyethylene, polypropylene, polyvinyl chloride, polystyrene, polycarbonate, polytetrafluoroethylene, nylon, polyphenylene sulfide, chlorinated polyether, ethylene-vinyl acetate copolymer, etc. thermosetting plastics are made of concentrated polymer resin as the basic component and are added with fillers, curing agents, and other additives. this kind of plastic becomes insoluble after being solidified and molded under certain temperature conditions, and it will not soften even if it is subjected to ordinary heat. thermosetting plastics have better curing leveling and wettability due to their small molecular weight, which makes them have strong adhesion to the pipe body when coating steel pipes, and enables plastic-coated steel pipes to obtain a smoother plastic film surface. commonly used thermosetting plastics are epoxy resin, phenolic resin, amino resin, etc.
epoxy powder anti-corrosion steel pipe according to the above classification of plastics, plastic powder coatings are also divided into two categories: thermoplastic powder coatings and thermosetting powder coatings. however, it should be pointed out that not all plastics can be used as plastic powder coatings, so there are fewer types of plastic powder coatings than plastics. at present, the thermosetting powder coatings used in various countries in the world mainly include epoxy powder coatings, epoxy phenolic powder coatings, polyester powder coatings, and epoxy-polyester powder coatings. among them, epoxy powder coating is the earliest variety of applications, and it is also the plastic powder coating with the highest output at present. it is widely used in the electrostatic spraying process and occupies a very important position in decorative plastic coating, and epoxy phenolic powder coating has high chemical corrosion resistance, so it is mostly used for anti-corrosion plastic coating. thermoplastic powder coatings currently mainly include polyethylene powder coatings, polyvinyl chloride powder coatings, polypropylene powder coatings, chlorinated polyether powder coatings, nylon powder coatings, polyphenylene sulfide powder coatings, etc. these thermoplastic powder coatings have their own advantages and disadvantages. at present, a large number of thermoplastic powder coatings are used for plastic-coated steel pipes, mainly linear low-density polyethylene powder coatings (lldpe); in the future, polyphenylene sulfide powder coatings (pps) are more promising.
plastic-coated steel pipe is a new type of green environmental protection pipe, and its specific properties can make it become the new favorite of the pipe industry in just a dozen years. first of all, from the perspective of consumers, whether it is plastic pipes or galvanized steel pipes, no one will focus on unprofitable products again if there is no more profit to be made, so, which is also a major reason for the rapid expansion of plastic-coated steel pipes. secondly, from the perspective of customers, compared with plastic pipes and galvanized steel pipes, customers prefer plastic-coated steel pipes in terms of product characteristics and application functions. value and use value. the plastic-coated composite steel pipe is a water supply composite pipe whose inner and outer walls are coated with epoxy resin powder coating. the inner wall has strong corrosion resistance and good chemical resistance and can transport fluid media at -30°c-90°c. after inspection, it meets the safety performance standards for drinking water, water delivery, and distribution. the inner wall coating has strong adhesion, excellent impact resistance, and strong resistance to cathodic disbonding. due to the smooth surface of the coating on the inner wall of the pipeline, it can prevent the growth and scaling of microorganisms. at the same time, the transmission resistance is small, which can increase the flow rate and save energy. the use of modified epoxy resin powder internal coating can achieve fire and flame retardancy and is especially suitable for the requirements of anti-corrosion and fire and flame retardancy of fire protection system pipelines. the surface of the inner wall of the steel pipe is smooth without burrs and other objects. it can be used as a shuttle object for wires or cables during construction, and the use effect is good.