High-fire-retardant glass fiber reinforced rigid polyurethane ultralow-temperature heat preserving material and manufacturing method thereof

Abstract

The invention relates to a high-fire-retardant glass fiber reinforced rigid polyurethane ultralow-temperature heat preserving material and a manufacturing method thereof. The material comprises 50-80 parts of common polyether polyol, 50-20 parts of fire-retardant polyether polyol, 100-130 parts of polymethylene polyphenyl polyisocyanates, 1-3 parts of surfactant, 0.1-0.5 part of catalyst, 5-10 parts of foaming agent and 5-15 parts of continous glass fiber mat. The manufacturing method includes the steps that the continous glass fiber mat is laid in a mold, other components are mixed uniformly under high-speed stirring, poured into the mold, foamed and cured to obtain the ultralow-temperature heat preserving material. The polyurethane heat preserving material can be used in the ultralow-temperature environment at the temperature of 173 DEG C, the product density is 110-140 kg / m<3>, the product thermal conductivity is smaller than 18 mw / m.K, the compressive strength is larger than 2.2 MPa, the tensile strength is larger than 3.0 MPa, the oxygen index is larger than 26, and the fire retardance can meet the standard of GB8624-2012 B2.

Description

technical field [0001] The invention belongs to the technical field of polyurethane composite materials, and in particular relates to a high flame-retardant glass fiber reinforced rigid polyurethane ultra-low temperature thermal insulation material and a preparation method thereof. Background technique [0002] Liquefied natural gas is recognized as the cleanest energy source. With my country's increasing emphasis on environmental protection, the demand for liquefied natural gas is increasing rapidly. The storage and transportation of liquefied natural gas requires the use of thermal insulation materials that maintain high thermal insulation, high strength and high stability in ultra-low temperature environments. Ordinary polyurethane material has excellent thermal insulation performance, but it will shrink severely at ultra-low temperature and cannot maintain its mechanical strength at room temperature. In addition, since polyurethane is a flammable material, welding opera...

AI Technical Summary

Problems solved by technology

Patent CN101235128A discloses a continuous fiber reinforced fiber with a density of 400-800kg / m 3 Polyurethane foam material, but the material is suitable for "load-bearing structural material" and cannot be used for insulation in ultra-low temperature environments

Patent CN101191010A discloses a continuous fiber reinforced polyurethane foam material, but the material cannot be used as an ultra-low temperature insulation material

Patent CN1834130A discloses a kind of density in 115-135kg / m 3 Insulation materials with a compressive strength of 1.4-1.7MPa, but the patent does not give a detailed thermal conductivity coefficient for the insulation performance of the material, and the flame retardant used in the patent is a small molecule added flame retardant, which migrates out of the bulk material over time It is impossible to guarantee that the material will maintain a high flame-retardant grade for a long time; patent CN101781395A discloses a density of 40-80kg / m 3 However, the patent does not mention the mechanical properties of the material at ultra-low temperatures, and the flame retardant used in the patent is also a small molecular compound, and there is also the possibility that the flame retardant migration will lead to a decrease in the flame retardant grade of the material. possible

[0003] In summary, there is no report of a polyurethane insulation material that maintains high strength, high dimensional stability and permanent flame retardancy under ultra-low temperature conditions (-170 degrees)

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