Polyurethane heat insulation foaming material and preparation method thereof

Abstract

The invention discloses a polyurethane heat insulation foaming material and a preparation method thereof. The polyurethane heat insulation foaming material comprises the following components in parts by weight: 100 parts of polyether polyol, 150-170 parts of polymethylene polyphenyl isocyanate, 5-30 parts of expanded perlite, 20-40 parts of a physical foaming agent, 10-15 parts of a flame retardant, 1-3 parts of a catalyst and 1.5-10 parts of a foam stabilizer. The density of hard polyurethane foams prepared by the preparation method is smaller than 65Kg / m<3>, the thermal conductivity is smaller than 21mW / m.K, the compressive strength is greater than 0.42MPa, the compression modulus is greater than 14MPa, and the oxygen index is more than or equal to 23, so that the polyurethane heat insulation foaming material is suitable for the field of heat insulation.

Description

technical field [0001] The invention belongs to the technical field of polyurethane materials, and in particular relates to a polyurethane thermal insulation foaming material and a preparation method thereof. Background technique [0002] Rigid polyurethane foam has become an irreplaceable thermal insulation material due to its low thermal conductivity, and is widely used in construction, aerospace, transportation, chemical and other fields. [0003] With the prohibition of the use of CFCs (that is, chlorofluorocarbons) blowing agents and the restriction of the use of HCFCs (that is, hydrofluorochlorocarbons) blowing agents, blowing agents with zero ODP (that is, Ozone Depression Potential ozone depletion potential) have become a research hotspot , commonly used blowing agents with zero ODP such as water, supercritical CO 2 , Pentane and HFCs etc. [0004] The disadvantage of pentane blowing agent is that it is flammable, and the mixture with air will explode under certain...

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Problems solved by technology

CN101130629A discloses a foaming polyurethane, expanded perlite composite building energy-saving material and on-site spraying construction technology, but the particle size range of perlite used in it is relatively large, which is 1-4 mm, and the added mass is 3-5 mm of the polyurethane reaction raw material. times, and did not specify the type of blowing agent used, the thermal insulation properties, mechanical properties, and flame retardant properties that the material can achieve

[0011] CN102531467A discloses a foamed polyurethane, expanded perlite composite thermal insulation and flame-retardant board and its preparation method, but the foaming agent used is not an environmentally friendly foaming agent, and the obtained polyurethane foam has a high thermal conductivity of 24 ~42mW / m·K, lost the excellent thermal insulation performance of polyurethane foam itself

[0012] Mingxing Ai et al. (Mingxing Ai, etc, Advanced Materials Research (2010), 96,141-144.) reported expanded perlite-doped polyurethane rigid foam system, but the blowing agent used is not an environmentally friendly blowing agent , and the thermal conductivity is greater than 23mW / m·K, and the average particle size of the expanded perlite used is 1.0mm, and the flame retardancy of the material has not yet been characterized

[0013] In summary, the expanded perlite particle size used in the rigid polyurethane material in the prior art is relatively large, the dispersion is not good, the thermal conductivity of the prepared material is high, the mechanical properties and flame retardancy are not clear, and the preparation process The use of non-environmentally friendly foaming agents will have an adverse impact on environmental protection

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