Polyurethane foam and preparation method thereof
A polyurethane foam and polyurethane technology, applied in the field of polyurethane foam and its preparation, can solve the problems of poor wear resistance of polyurethane foam, and achieve the effects of reducing surface energy, improving mechanical strength, and reducing the phenomenon of chipping.
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[0027] see figure 1 , the embodiment of the present invention also provides a method for preparing polyurethane foam, comprising:
[0028] Step 100. Put component A and component B in a container and stir them evenly to form a prepolymer. During the stirring process, the temperature in the container is kept at 0°C to 10°C; An isocyanate with more than one -NCO group; component B includes polyethylene and polyol, the mass part of polyethylene in component B is 5% to 10%, and the mass part of polyol in component B is 90% ~95%; the equivalent ratio of -NCO group in isocyanate to -OH group in polyol is 0.95:1~1.05:1;
[0029] Step 200, filling the container with foaming gas to make the pressure in the container reach 1MPa-10MPa, and keep it for 5-15 minutes;
[0030] Step 300, transport the prepolymer to the coating machine through the pipeline, and coat the prepolymer on the substrate through the coating machine, wherein, during the process of transporting the prepolymer to the...
Embodiment 1
[0098] This embodiment provides that polyurethane foam is formed by the polymerization of component A and component B. Component A includes MDI monomer, and the mass of component A is 14.48g, wherein the equivalent weight of the -NCO group in the isocyanate is 125; Part B includes a mixture of 8.7 g of spherical polyethylene having a diameter of 1 micron, a molecular weight of 4500, and a polyol having a hydroxyl value of 65 mgKOH / g, and 100 g of PPG.
[0099] The preparation method of above-mentioned polyurethane foam comprises:
[0100] Put component A and component B in a container and stir evenly to form a prepolymer, and keep the temperature at 5°C during the stirring process;
[0101] Fill the container with carbon dioxide to make the pressure in the container reach 4.5MPa and keep it for 12 minutes;
[0102] Transporting the prepolymer to the coating machine through the pipeline, and coating the prepolymer on the substrate, wherein, during the process of transporting t...
Embodiment 2
[0105] This embodiment provides that polyurethane foam is formed by the polymerization of component A and component B. Component A includes MDI monomer, and the mass of component A is 15.21g, wherein the equivalent weight of the -NCO group in the isocyanate is 125; Part B included a mixture of 8.7 g of spherical polyethylene having a diameter of 1 micron, a molecular weight of 4000, and 100 g of PPG, and the hydroxyl value of the polyol was 65 mgKOH / g.
[0106] The preparation method of above-mentioned polyurethane foam comprises:
[0107] Put component A and component B in a container and stir evenly to form a prepolymer. During the stirring process, the temperature in the container is kept at 5°C;
[0108] Fill the container with carbon dioxide to make the pressure in the container reach 6MPa and keep it for 10 minutes;
[0109] The prepolymer is transported to the coating machine through the pipeline, and the prepolymer is coated on the substrate, and the prepolymer is tra...
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Abstract
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