Polyurethane thermal-insulation material and preparation method thereof
A technology of thermal insulation and polyurethane, which is applied in the field of thermal insulation materials, can solve the problems of incompatibility between mechanical properties and thermal insulation properties, and achieve the effects of solving poor mechanical strength and thermal insulation properties, reducing costs, and enhancing the rigidity of cell walls and foams
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Embodiment 1
[0019] A polyurethane thermal insulation material, which is formed by mixing A component and B component according to the mass ratio of 1:1.2, and the A component includes 80 parts by weight of isocyanate, 15 parts of phenolic resin, and 10 parts of foaming agent part; the B component includes 60 parts of polyether polyols, 15 parts of bagasse nanocellulose, 10 parts of diatomaceous earth, 5 parts of fatty alcohol polyoxyethylene ether, and 1 part of deionized water by weight;
[0020] Wherein, the bagasse nanocellulose is prepared by the following method: wash the bagasse with water, add it to a mixed solvent of toluene and ethanol with a volume ratio of 2:1, place it in a water bath at 90°C for 3 hours, filter and dry , crushed to a particle size of 200 mesh, dispersed in distilled water at a mass volume ratio of 1:8, boiled for 0.5h, filtered and added to a NaOH solution with a mass fraction of 5wt% according to a mass volume ratio of 1:10, and adjusted to a pH value of 11 ...
Embodiment 2
[0025] A polyurethane thermal insulation material, which is formed by mixing component A and component B according to a mass ratio of 1:1.5, and component A includes 60 parts by weight of isocyanate, 25 parts of phenolic resin, and 5 parts of foaming agent part; the B component includes 80 parts by weight of polyether polyol, 5 parts of bagasse nanocellulose, 20 parts of diatomaceous earth, 1 part of fatty alcohol polyoxyethylene ether, and 3 parts of deionized water;
[0026] Wherein, the bagasse nanocellulose is prepared by the following method: wash the bagasse with water, add it to a mixed solvent of toluene and ethanol with a volume ratio of 4:1, place it in a water bath at 70°C for 6 hours, filter and dry , crushed to a particle size of 50 mesh, dispersed in distilled water at a mass volume ratio of 1:10, boiled for 0.2h, filtered and added to a NaOH solution with a mass fraction of 2wt% according to a mass volume ratio of 1:20, and the pH value was adjusted to 12 , plac...
Embodiment 3
[0031] A polyurethane thermal insulation material, which is formed by mixing component A and component B according to a mass ratio of 1:1.3, the component A includes 70 parts by weight of isocyanate, 20 parts of phenolic resin, and 7 parts of foaming agent part; the B component includes 70 parts by weight of polyether polyol, 10 parts of bagasse nanocellulose, 15 parts of diatomaceous earth, 3 parts of fatty alcohol polyoxyethylene ether, 2 parts of deionized water;
[0032] Wherein, the bagasse nanocellulose is prepared by the following method: wash the bagasse with water, add it to a mixed solvent of toluene and ethanol with a volume ratio of 3:1, place it in a water bath at 80°C for 4 hours, filter and dry , crushed to a particle size of 100 mesh, dispersed in distilled water at a mass volume ratio of 1:9, boiled for 0.3h, filtered and added to a mass fraction of 3wt% NaOH solution according to a mass volume ratio of 1:15, and the pH value was adjusted to 12 , placed in a w...
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