Cement mortar anti-corrosion steel pipe for sewage treatment, epoxy coal tar anti-corrosion steel pipe manufacturer

Description :

　　Cement mortar lining anti-corrosion steel pipe is made by mixing ordinary cement with a certain thickness of yellow sand and additives, according to the research and invention of the mixing ratio, to make mortar, and applying it to the pipeline through construction machinery and equipment to form a certain thickness of mortar coating. After solidification, it becomes the lining. The anti-corrosion steel pipe with cement mortar lining relies on its own bonding force and the support of the pipeline wall, and its structure is uniform, dense, and firm. Therefore, the specifications for anti-corrosion steel pipes with cement mortar lining have been formulated.

　　Steel reinforced concrete, as an emerging composite structure, is mainly composed of obstructed components with small axial obstruction and eccentricity of work capacity, and is widely used in frame structures. The anti-corrosion components of cement mortar lined anti-corrosion steel pipes are anti-corrosion primer and topcoat. Cement mortar anti-corrosion steel pipes for drainage have good elastic-plastic properties. They are mainly made of epoxy resin and coal tar as film-forming materials, and are mainly suitable for underground anti-corrosion construction of pipelines with a diameter of DN700 or above. When the steel pipe is deformed and flattened under external pressure, the mortar will crack in a "hair like" manner. However, it is very difficult for the mortar to peel off from the pipe wall. For example, on a steel pipe with a diameter of DN800 millimeters and a wall thickness of 7.1 millimeters, a one meter long pipe section is cut and lined with an 11 millimeter thick mortar coating. When the flatness is 7-8 millimeters, the appearance of "hair like" cracks can be seen.

　　With the continuous development of municipal construction, higher and higher requirements have been put forward for the construction technology and quality of pipelines. For the external anti-corrosion of buried steel pipes, we have eliminated petroleum asphalt external anti-corrosion and uniformly adopted epoxy coal tar anti-corrosion steel pipes. The advantages of using epoxy coal tar pitch anti-corrosion steel pipes are: firstly, it has the advantages of good water resistance, excellent rust prevention performance, and bacterial resistance of coal tar pitch, as well as the characteristics of tough epoxy resin coating, good adhesion, and high mechanical strength. 2、 The chemical resistance, electrical insulation performance, microbial erosion resistance, and seawater resistance of its film-forming coating are relatively stable, especially its water absorption rate is very low and it is far more resistant to microbial erosion than petroleum asphalt. 3、 It has a longer service life. Construction requirements for epoxy coal tar anti-corrosion steel pipes: 1. Surface treatment of steel pipes. Generally, the surface of steel pipes has oxide scale, rust, oil stains, dust, etc. If not treated, it will directly affect the adhesion of the coating. In order to ensure the service life of the anti-corrosion layer, sandblasting is required for steel surface treatment (with obvious roughness visible to the naked eye). After rust removal, primer should be applied within 6 hours. 2. Apply primer. Primer can be applied using a roller brush or a paintbrush, and the primer should be applied as thinly as possible, generally between 30 microns and 50 microns. Attention should be paid to ensuring that the paint film is uniform and not missed. The components of epoxy coal tar are epoxy coal tar primer and topcoat, both of which are mainly composed of epoxy resin and coal tar as film-forming materials, and are made by adding various anti rust pigments, insulating fillers, toughening agents, anti settling agents, etc. 3. Appearance: Primer component A is iron red, component B is black, and the topcoat is black. It has excellent resistance to chemical media corrosion and good physical and mechanical properties, good adhesion, tough coating, as well as excellent electrical insulation, anti permeability, anti stray current and anti microbial erosion. After film formation, it can reduce the number of construction passes. The main implementation standards are the "Technical Standard for Epoxy Coal Tar Anti corrosion Coating of Buried Steel Pipeline" and the "Technical Standard for Liquid Epoxy Coating Internal Anti corrosion Coating of Steel Pipeline".

　　Epoxy coal tar coating has the following characteristics: 1. Interpenetrating mesh anti-corrosion layer. By modifying traditional epoxy coal tar pitch with chlorosulfonated polyethylene rubber with excellent anti-corrosion performance, it forms an interpenetrating network anti-corrosion coating between the epoxy resin chain and the rubber chain after curing, which has the advantages of low water absorption, good water resistance, strong resistance to microbial erosion, and high permeability. 2. Superior comprehensive anti-corrosion performance. Due to its use of rubber modification with excellent anti-corrosion performance, the physical and mechanical properties, electrical insulation performance, wear resistance, stray current resistance, heat resistance, temperature resistance, and other properties of the coating are improved. 3. One time film thickness, tough paint film. Low solvent content, thick film formation at once, fewer construction passes, and the construction method is the same as traditional epoxy coal tar coatings.

　　Epoxy coal tar anti-corrosion steel pipes are mainly used for anti-corrosion of the outer walls of buried or underwater steel oil, gas, water, and heating pipelines. They are also suitable for anti-corrosion of various steel structures, docks, ships, water gates, gas storage tanks, refinery and chemical plant equipment, as well as waterproofing and leakage prevention of concrete structures such as concrete pipes, sewage tanks, rooftop waterproof layers, and bathrooms.

　　Cement mortar anti-corrosion steel pipes have high bearing capacity and superior seismic performance. Their corrosion resistance is better than that of steel structures, which is beneficial for the fire resistance and prevention of steel pipes. It is suitable for: municipal engineering: public high-rise building water supply, heating network, cooling water engineering, gas transmission, buried water transmission and other pipelines. Oil: Oil transportation pipelines. Sewage treatment: Sewage treatment discharge pipes, sewage pipes, and biological tank anti-corrosion engineering. Agriculture: Network of agricultural irrigation pipes, deep well pipes, drainage pipes, etc. The material for cement mortar coating is easy to obtain, with a short construction period, good anti-corrosion effect, and low cost. Given the advantages of cement mortar, such as its anti-corrosion properties and cost-effectiveness, it has been increasingly recognized by engineering and technical departments both domestically and internationally. Large and medium-sized cities in China use cement mortar as the main source of anti-corrosion for water supply metal pipelines.

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