Polyurethane insulation pipe not only has the advanced technology and practical performance that traditional trench and overhead laying pipeline can't match, but also has remarkable social and economic benefits, which is also a powerful measure of heating and energy saving. The technology of directly buried heat supply pipeline is adopted for prefabricated directly buried thermal insulation pipe, which indicates that the development of heat supply pipeline technology in China has entered a new starting point. With the decreasing of energy and increasing demand in the world, energy conservation, emission reduction and environmental protection have become the trend of global development. The national and local governments also strongly advocate the development, application and industrialization of energy-saving, emission reduction and environmental protection products. Polyurethane rigid foam thermal insulation materials for construction industry is an important branch of polyurethane industry, which is characterized by multi-purpose, thermal insulation, thermal insulation, and so on Waterproof and other functions. This kind of product has been used in European construction industry for 40 years since 1960s. Some countries also take polyurethane as the insulation and waterproof material specified by the construction industry through legislation.
The first thing to bear the brunt of the polyurethane insulation pipeline is the steel jacket steel insulated steel pipe, It can also be directly buried underground without concrete structure, that is, the thermal expansion of working steel pipe is carried out in the outer pipe, so as to reduce the material cost, shorten the construction date, and ensure the safety of the heat supply pipeline. It can be widely used in different temperature environment, especially for high temperature steam pipeline project. The steel sleeve steel insulation pipe with a temperature of up to 150 -450 C is made up of an external protective steel pipe, a steel pipe anticorrosion, a polyurethane foam insulation layer and an internal working steel pipe. Steel sleeve steel steam composite insulation pipe is suitable for conveying steam or other media below 2.5MPa and 350 ℃. The product uses steel pipe as outer protective layer, which has the advantages of high strength, easy maintenance and long service life.
According to different sliding modes, the thermal insulation structure of steel sheathed steel insulation pipe is divided into internal sliding type and external sliding type. 1. Internal sliding type: the insulation structure is composed of working steel pipe, aluminum silicate, drag reducing layer, microporous calcium silicate, thermal insulation layer, stainless steel fastening steel strip, aluminum foil reflective layer, polyurethane insulation layer, outer steel pipe and external anti-corrosion coating. 2. External sliding type: the thermal insulation structure is composed of working steel pipe, glass wool thermal insulation layer, aluminum foil reflective layer, stainless steel fastening belt, sliding guide bracket, air insulation layer, external steel pipe and external anti-corrosion coating.
Polyurethane directly buried insulation pipe has been widely welcomed because of its long history of corrosion resistance and anti-aging. Therefore, there is a great demand for the market. Therefore, there is a large demand for production of polyurethane insulation pipes. For the production and processing of polyurethane insulation pipe, it is necessary to deal with the specific use and structure. For the insulation layer with inner pipe and outer pipe, polyurethane foam insulation pipe is usually filled with foam slurry directly between the two pipes to form foam at one time.
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