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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

Active Publication Date: 2014-07-16
WANHUA ENERGY-SAVING TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] 3. When the ambient temperature is below 0°C, especially below -10°C, the isocyanate component is prone to excessive viscosity and crystallization and precipitation after long-term storage, resulting in spraying The machine does not work smoothly

Method used

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  • Polyurethane foam two-component raw material suitable for low-temperature environment and construction method thereof
  • Polyurethane foam two-component raw material suitable for low-temperature environment and construction method thereof
  • Polyurethane foam two-component raw material suitable for low-temperature environment and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention relates to a polyurethane foam two-component raw material in compounds in the field of chemistry and a construction method thereof, and particularly relates to a polyurethane foam two-component raw material suitable for construction in autumn and winter for hydraulic concrete dam insulation engineering and the repair of cracks in a low temperature cold storage. The polyurethane foam two-component raw material comprises an isocyanate component and a polyol component, wherein the polyol component contains low-temperature and highly active polyether polyol which accounts for 15-45% of the total weight of the polyol component, the polyol component contains a physical foaming agent having a boiling point not higher than the construction temperature of 20 DEG C and accounting for 5-25% of the total weight of the polyol component, the isocyanate component is polymethylene polyphenyl isocyanate, a viscosity reducer, which accounts for 5-25% of the weight of polymethylene polyphenyl isocyanate, is added into polymethylene polyphenyl isocyanate and the viscosity of the polymethylene polyphenyl isocyanate is reduced to 100cps or less after the addition of the viscosity reducer. The polyurethane foam two-component raw material disclosed by the invention can be normally constructed at -30 DEG C and above ambient temperature.

Description

technical field [0001] The invention relates to a polyurethane rigid foam two-component raw material in chemical compounds and a construction method thereof, in particular to a polyurethane rigid foam two-component raw material suitable for thermal insulation of buildings such as dams and a construction method thereof. The polyurethane rigid foam two-component raw material, construction method and application thereof are especially suitable for the autumn and winter construction of hydraulic concrete dam insulation projects and the crack repair of low-temperature cold storage. Background technique [0002] Most of the cracks produced by mass concrete such as dams are surface cracks, and the main causes of surface cracks are drying shrinkage and temperature stress. The temperature stress is mainly the surface tensile stress caused by the increase of the temperature difference between the inside and outside of the mass concrete due to changes in the outside temperature such as...

Claims

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Application Information

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IPC IPC(8): C08G18/48C08G18/50C08J9/14C09D175/08E04B1/76
CPCC08G18/4018C08G18/482C08G2150/50C08G2150/60C08J9/146C08J2203/142C08J2375/08C08G2110/0025E02D15/00
Inventor 王磊李坤王炳凯王耀西余郁窦忠山潘振勇
Owner WANHUA ENERGY-SAVING TECH GRP CO LTD
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