Polyurethane foam two-component raw material suitable for low-temperature environment and construction method thereof
A polyurethane rigid foam and low-temperature environment technology, which is applied in polyurea/polyurethane coatings, thermal insulation, infrastructure engineering, etc., can solve problems such as high viscosity and inability of spraying machines to work smoothly
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Embodiment 1
[0032] Polyol component:
[0033]
[0034] Isocyanate component:
[0035] Polymethylene polyphenylisocyanate PM-200 (Wanhua Chemical Group Co., Ltd. ) 95wt%, viscosity reducer fluorodichloroethane (HCFC-141b) 7wt%;
[0036] Equipment: H25 spraying machine (Graco, USA)
[0037] The mixing ratio of the two components is: isocyanate component: polyol component = 100:100 (volume ratio);
[0038] Ambient temperature: -20 degrees
[0039] Production steps:
[0040] (1) Insert the two-component feeding pumps of the spraying machine into the corresponding raw material barrels, turn on the power and the air compressor and other preparations;
[0041] (2) Set the heating temperature of spraying machine raw materials and pipelines to 55°C;
[0042] (3) Use a spray gun to spray the raw material on the substrate, and spray more than 5 layers to complete the foam with a thickness of 8cm;
[0043] The color of the prepared foam is uniform gray, and various physica...
Embodiment 2
[0046] raw material:
[0047] Polyol component:
[0048]
[0049] Isocyanate component:
[0050] Polymethylene polyphenylisocyanate PM-200 (Wanhua Chemical Group Co., Ltd.) 95wt%, viscosity reducer diethyl ethyl phosphate (DEEP) 5wt%;
[0051] Equipment: H25 spraying machine (Graco, USA)
[0052] The mixing ratio of the two components is: isocyanate component: polyol component = 100:100 (volume ratio);
[0053] Ambient temperature: -30 degrees
[0054] Production steps:
[0055] (1) Insert the two-component feeding pumps of the spraying machine into the corresponding raw material barrels, turn on the power and the air compressor and other preparations;
[0056] (2) Set the heating temperature of the raw materials and pipelines of the spraying machine to 65°C, and preheat the substrate if necessary;
[0057] (3) Use a spray gun to spray the raw material on the substrate, and spray more than 5 layers to complete the foam with a thickness of 8cm;
...
Embodiment 3
[0061] raw material:
[0062] Polyol component:
[0063]
[0064] Isocyanate component:
[0065] Polymethylene polyphenylisocyanate PM-200 (Wanhua Chemical Group Co., Ltd.) 75 wt%, viscosity reducer tris (2-chloropropyl) phosphate (TCPP) 25 wt%;
[0066] Equipment: HVR (Graco, USA)
[0067] The mixing ratio of the two components is: isocyanate component: polyol component = 150:100 (volume ratio);
[0068] Ambient temperature: -30 degrees
[0069] Production steps:
[0070] (1) Insert the two-component feeding pumps of the spraying machine into the corresponding raw material barrels, turn on the power and the air compressor and other preparations;
[0071] (2) Set the heating temperature of the raw materials and pipelines of the spraying machine to 65°C, and preheat the substrate if necessary;
[0072] (3) Use a spray gun to spray the raw material on the substrate, and spray more than 5 layers to complete the foam with a thickness of 8cm;
[0073...
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