What is the role of injecting epoxy resin into steel pipes?
In the field of building fire protection systems, steel pipes coated with epoxy resin inside and outside play an important role, so the quality of steel pipes coated with epoxy resin inside and outside is better. The samples of epoxy resin inside and outside are the key to the fire protection system. So let's introduce some of the functions of steel pipes coated with epoxy resin inside and outside, the performance of its powder (epoxy resin), and the product performance of steel pipes coated with epoxy resin inside and outside.
The earliest steel pipes coated with epoxy resin inside and outside were
galvanized steel pipes. Later, it was found that the galvanized layer on the inner wall had no benefit in improving the adhesion of the inner coating, but had an impact, and at the same time increased the cost of the galvanizing process. In order to improve the adhesion of the inner coating, the inner galvanizing of the galvanized steel pipe must also adopt the dezincification process, which once again increases the cost and causes energy waste. Therefore, there are also
welded steel pipes that are directly coated. The base pipe of the steel pipe coated with epoxy resin inside and outside should be sandblasted before plastic coating to remove rust, oil stains and galvanized layer on the metal surface, which is generally called surface pretreatment. The construction industry has no quantitative index requirements for surface pretreatment, and the petroleum industry is relatively specific.
Injecting epoxy resin into steel pipes can play many roles, mainly in the following aspects.
1. Anti-corrosion effect of epoxy resin: Since steel pipes are prone to rust, injecting epoxy resin can effectively prevent rust and corrosion inside the steel pipe, thereby extending the service life of the steel pipe.
2. Strengthening effect of epoxy resin: Epoxy resin can fill the gaps in the steel pipe, enhance the strength and stability of the steel pipe, and make the steel pipe more durable.
3. Sealing effect of epoxy resin: Injecting epoxy resin can effectively seal the gaps and cracks inside the steel pipe, prevent water and air from entering the steel pipe, thereby avoiding corrosion and rupture inside the steel pipe.
4. Shock absorption of epoxy resin: Steel pipes will generate certain vibrations and noises during use. Injecting epoxy resin can reduce the vibrations and noises of the steel pipes, and improve comfort and safety.
Performance of epoxy resin
(1) High mechanical properties. Epoxy resin has strong cohesive force and dense molecular structure, so its mechanical properties are higher than general-purpose thermosetting resins such as phenolic resin and unsaturated polyester.
(2) Strong adhesion. The epoxy resin curing system contains highly active epoxy groups, hydroxyl groups, and polar groups such as ether bonds, amine bonds, and ester bonds, which give epoxy cured products excellent adhesion to polar substrates such as metals, ceramics, glass, concrete, and wood.
(3) Small curing shrinkage. Generally, it is 1% to 2%. It is one of the thermosetting resins with the smallest curing shrinkage (phenolic resin is 8% to 10%; unsaturated polyester resin is 4% to 6%; silicone resin is 4% to 8%). The linear expansion coefficient is also very small, generally 6×10-5/℃. Therefore, the volume does not change much after curing.
(4) Good processability. Epoxy resin basically does not produce low-molecular volatiles when curing, so it can be low-pressure molded or contact-pressed molded. It can be combined with various curing agents to manufacture environmentally friendly coatings such as solvent-free, high-solid, powder coatings, and water-based coatings.
(5) Excellent electrical insulation. Epoxy resin is one of the thermosetting resins with the best dielectric properties.
(6) Good stability and excellent chemical resistance.
(7) The heat resistance of epoxy cured products is generally 80-100℃. The heat-resistant varieties of epoxy resin can reach 200℃ or higher.
The epoxy resin steel pipe coated inside and outside has good temperature resistance because the heavy anti-corrosion modified epoxy resin used is a thermosetting plastic. Its coating can be used for a long time at -30℃ to 200℃ and does not burn. At the same time, it has chemical corrosion resistance, fire extinguishing agent corrosion resistance, high temperature resistance and wood pile fire resistance, as well as corrosion or flame resistance in water and waterless conditions. It is especially suitable for fire fighting water and gas extinguishing. The epoxy resin steel pipe coated inside and outside has excellent chemical corrosion resistance, water resistance and resistance to corrosion by anti-solvent, protein, and high-multiple foam fire extinguishing agent. It solves the corrosion of metal pipes due to water transmission, burial, acid, alkali, and salt, and greatly improves the service life of fire fighting and water supply (gas) pipes. The service life can reach more than 50 years. At the same time, the comprehensive maintenance cost is only 1/6 of that of ordinary galvanized steel pipes.
Conclusion
Injecting epoxy resin into steel pipes significantly improves their performance, service life and suitability for harsh conditions. From improved corrosion resistance to reduced noise, these benefits make these pipes indispensable in construction, fire protection and other applications, ensuring convenience, safety and long-term reliability.
About-BAOWI STEEL MANUFACTURING CO.,LTD
BAOWI Steel is committed to providing high-quality steel pipes with epoxy resin coating inside and outside. With advanced production technology and strict quality control, our products have been widely used in many fields such as fire protection, construction and oil industry. Choosing BAOWI Steel, you will get high-quality steel pipe products and professional service guarantee. Whether it is high-standard anti-corrosion performance or long service life, BAOWI Steel always provides you with the best pipeline solutions. Let BAOWI Steel escort your project!
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