How is the polyurethane blend polyol used in transportation and water materials?
In addition to the insulation materials for refrigerated transport vehicles, rigid polyurethane foam is also used in other components of vehicles, trains, ships and other vehicles.
Polyurethane rigid foam is currently widely used in car ceilings and interior parts. In the past, it was composed of fabric or polyvinyl chloride film and polyurethane soft foam. Currently, Polyurethane rigid foam materials are basically used, such as cast hard foam, spray hard foam, glass Fiber-reinforced rigid foam and thermoformed rigid foam sheets and thermo-pressed composites of decorative fabrics, etc. In particular, thermoformed composite hard foam made of open-cell foam improves vehicle assembly efficiency, and its strength, dimensional stability, thermal insulation, sound absorption, etc. can meet the requirements of use.
Rigid polyurethane structural foam is used in a variety of automotive components, such as door panels, trunk lids, engine hoods, etc. Flexible polyurethane semi-rigid foam is used as a shock-absorbing component in automobiles. The train carriage uses Polyurethane rigid foam for thermal insulation, and the effect is remarkable.
PU rigid foam is also used as thermal insulation material for refrigerated trucks, refrigerated containers, etc., which can ensure that the temperature of frozen food is within the required range during long-distance transportation. It can also be used as insulation material for air-conditioned carriages.
Rigid foam plastics are also used as cryogenic insulation materials for liquefied gas ships and liquefied gas storage tanks. They have a low gasification rate and are much better than mineral wool and other thermal insulation materials.
When building railways and highways in permafrost and seasonally frozen soil areas, corresponding anti-freeze measures must be taken to avoid frost heaving or melting damage to road genes, which may cause huge losses. Rigid polyurethane foam has been used as roadbed insulation material in the permafrost areas of Qingkang Highway and Qinghai-Tibet Railway in my country. There are two construction methods for applying rigid polyurethane foam on the roadbed: the laying of glued boards and the on-site spraying method.
Polyurethane rigid foam with closed cell structure can be used as the filling material of lifebuoys and has the advantages of light weight, high strength and water resistance. Filled polyurethane fender (ball) is a lightweight floating fender system that uses lightweight, tough and highly elastic foam as the buffering medium. It has better energy absorption than inflatable fenders, is lightweight and flexible, and is widely used in yachts, small boats, Ship-to-ship operations such as naval vessels.