Plastic-steel thermal insulation pipes have been widely used in some developed countries as early as many years ago and have received very good energy-saving effects. In recent years, China's heating engineering and technical personnel have promoted the development of domestic pipe network deployment technology to a higher level by digesting and absorbing this advanced technology. Directly-buried insulation pipe is formed by tightly connecting a steel pipe for conveying medium, a high-density polyethylene outer sleeve, and a rigid polyurethane foam insulation layer between the steel pipe and the outer sleeve.
If you use field foaming spray polyurethane, there will often be some problems, such as:
Polyurethane insulation pipe starts slowly. This phenomenon usually occurs during the autumn or winter season or in the morning because of sudden temperature drop or low temperature. Raise the ambient temperature and black material temperature to solve. Generally, the temperature of the black material rises to 30-60°C, and the ambient temperature rises to 20-30°C.
Polyurethane insulation pipe rises quickly This phenomenon generally occurs in the spring and summer or noon construction, because the sudden increase in temperature caused by too much temperature. Black material can be cooled with cold water or outdoor natural cooling at night to avoid direct sunlight.
Polyurethane insulation tube foam strength is relatively small and the bubble is soft. This phenomenon is caused by the black and white material imbalance. Properly increase the proportion of black material (1:1—1.05). Be careful not to make the proportion of black material too large. Otherwise, it will make bubbles change. Brittleness also affects foam performance.
Therefore, we can use the factory preset method when we are doing insulation pipe, and use a high-pressure foaming machine to inject the rigid polyurethane foam plastic liquid into the cavity formed between the outer sheaths at one time. This is not only simple in construction, but also convenient to transport. , More energy-efficient!
If you use field foaming spray polyurethane, there will often be some problems, such as:
Polyurethane insulation pipe starts slowly. This phenomenon usually occurs during the autumn or winter season or in the morning because of sudden temperature drop or low temperature. Raise the ambient temperature and black material temperature to solve. Generally, the temperature of the black material rises to 30-60°C, and the ambient temperature rises to 20-30°C.
Polyurethane insulation pipe rises quickly This phenomenon generally occurs in the spring and summer or noon construction, because the sudden increase in temperature caused by too much temperature. Black material can be cooled with cold water or outdoor natural cooling at night to avoid direct sunlight.
Polyurethane insulation tube foam strength is relatively small and the bubble is soft. This phenomenon is caused by the black and white material imbalance. Properly increase the proportion of black material (1:1—1.05). Be careful not to make the proportion of black material too large. Otherwise, it will make bubbles change. Brittleness also affects foam performance.
Therefore, we can use the factory preset method when we are doing insulation pipe, and use a high-pressure foaming machine to inject the rigid polyurethane foam plastic liquid into the cavity formed between the outer sheaths at one time. This is not only simple in construction, but also convenient to transport. , More energy-efficient!
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