Polyethylene outer casing opens up new space for anti-corrosion insulation

In the fields of petrochemical, water, heating, industrial refrigeration, etc., most of the traditional anti-corrosion and thermal insulation measures are made of asbestos, ash or polyurethane, and the outer layer is made of asbestos cloth for anti-corrosion and heat preservation. The effect is not ideal. Recently, the reporter saw in an interview with the new thermal insulation material factory of Qilu Petrochemical Life Management Department that a polyethylene prefabricated thermal insulation sleeve that can be overhead or directly buried came into being, opening up a new space for anti-corrosion insulation materials. This kind of new building materials that the country is promoting and applying in the construction field has many advantages such as environmental protection, good performance and simple construction, and is increasingly favored by the market.

Li Fujun, director of Qilu Petrochemical's new thermal insulation material factory, told the reporter that the polyethylene outer casing is made of high-density polyethylene. The diameter and length of the product can be adjusted according to the user's needs. The construction and installation is carried out by the thermal insulation material factory. The steel pipe which needs anti-corrosion insulation is placed in the polyethylene casing, and the polyurethane foam is injected into the middle to fully fill the gap between the steel pipe and the polyethylene casing, and finally the steel pipe, the casing and the heat insulation layer form a firm whole. To achieve the effect of anti-corrosion insulation; this anti-corrosion insulation method can be overhead or buried in the ground, the entire construction process is carried out on site?

According to reports, compared with the traditional direct buried insulation materials, the polyethylene outer casing has the characteristics of high mechanical strength, good sealing performance, strong corrosion resistance, low heat loss and long service life, which are manifested in the following aspects: Through the setting of fixed support and sliding support mechanical compensator, the deformation of the direct buried heat preservation pipe is standardized and coordinated, and the engineering damage caused by thermal expansion and contraction is eliminated; it can be effectively waterproof, moisture proof, acid, alkali, salt and oil resistant. And the overall good, beautiful and generous, no deformation, the structure does not enter the water; by setting the polyurethane foam layer, the insulation layer and the outer sheath form a whole, solving the corrosion problem of the steel of the overhead and direct buried insulation pipe The service life is up to 30 50 years, while the traditional insulation material has a short service life, generally only between 35 years; the polyurethane foam filled in the casing has good mechanical properties and thermal insulation properties, and is usually durable in operation. The temperature is 120 degrees Celsius and the short-term temperature is 130 degrees Celsius.

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Casting polyurethane prepolymers involves a process where a liquid mixture of polyols and isocyanates is poured into a mold or container and allowed to cure or solidify. This process is commonly used in various industries such as automotive, construction, and manufacturing.
Here is a step-by-step guide on how to cast polyurethane prepolymers:
1. Prepare the mold: Clean the mold thoroughly and ensure it is free from any debris or contaminants. Apply a mold release agent to facilitate the easy removal of the cured polyurethane.
2. Measure and mix the components: Measure the desired amount of polyol and isocyanate components. The specific ratio will depend on the desired properties of the final product, which can be found in the product's technical data sheet. Pour the measured components into a clean mixing container.
3. Mix the components: Use a mechanical mixer or a high-speed drill with a mixing attachment to thoroughly mix the polyol and isocyanate components together. Make sure to mix for the recommended amount of time specified by the manufacturer to ensure complete homogeneity.
4. Degassing: After mixing, it is important to degas the mixture to remove any trapped air bubbles. This can be done by placing the mixture in a vacuum chamber and applying vacuum pressure for a specified period of time. Alternatively, a vacuum degassing unit can be used.
5. Pouring the mixture: Once the mixture is properly degassed, pour it into the prepared mold or container. Take care to avoid introducing any additional air bubbles during the pouring process.
6. Curing: Allow the poured mixture to cure at room temperature or, if necessary, in a temperature-controlled environment. The curing time will vary depending on the specific polyurethane prepolymer used and the desired hardness or flexibility of the final product. Follow the manufacturer's recommendations for curing time and temperature.
7. Demolding: After the polyurethane has fully cured, carefully remove it from the mold or container. Use caution to prevent any damage to the cured part.
8. Post-curing (optional): Depending on the specific polyurethane prepolymer used, post-curing may be required to optimize the material's properties. This can be done by subjecting the cured part to elevated temperatures for a specific period of time.
It is important to note that casting polyurethane prepolymers requires proper safety precautions, such as wearing appropriate personal protective equipment (PPE) and working in a well-ventilated area. Always follow the manufacturer's instructions and guidelines for handling and working with polyurethane prepolymers.

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