Heat insulation cold closet for medical supplies

Abstract

The invention relates to a heat insulation cold closet for medical supplies, comprising a closet body with an opening, and a cover body sealed and meshed with the opening; the closet body, from inside to outside, successively consists of a rigid polyurethane layer, a vacuum heat insulation panel layer, a foamed polyurethane panel layer and a housing. The coefficient of heat insulation is smaller than or equal to 0.004 W/mK, heat radiation, heat conduction and heat convection between the interior of the closet body and the external environment can be effectively prevented, and the heat insulation closet can guarantee that the interior temperature is controlled at 2-8° C. for more than 120 hours. The heat insulation cold closet according to the present invention is mainly used for cold storage and freezing of drugs, such as vaccines, insulin, blood products, biological products and reagents, during transportation and storage.

What is claimed is: 
     
         1 . A heat insulation cold closet for medical supplies, comprising a closet body with an opening, and a cover body sealed and meshed with the opening, characterized in that the closet body, from inside to outside, successively consists of a rigid polyurethane layer, a vacuum heat insulation panel layer, a foamed polyurethane panel layer and a housing. 
     
     
         2 . The heat insulation cold closet for medical supplies according to  claim 1 , characterized in that the cover body, from inside to outside, successively consists of a vacuum heat insulation panel layer, a foamed polyurethane panel layer and a housing. 
     
     
         3 . The heat insulation cold closet for medical supplies according to  claim 1 , characterized in that the rigid polyurethane layer has a thickness of 2 to 5 mm, the vacuum heat insulation panel layer has a thickness of 8 to 15 mm, and the foamed polyurethane panel layer has a thickness of 5 to 20 mm. 
     
     
         4 . The heat insulation cold closet for medical supplies according to  claim 2 , characterized in that the rigid polyurethane layer has a thickness of 2 to 5 mm, the vacuum heat insulation panel layer has a thickness of 8 to 15 mm, and the foamed polyurethane panel layer has a thickness of 5 to 20 mm. 
     
     
         5 . The heat insulation cold closet for medical supplies according to  claim 3 , characterized in that the material of the housing is polypropylene or polyethylene. 
     
     
         6 . The heat insulation cold closet for medical supplies according to  claim 1 , characterized in that the rigid polyurethane layer is obtained by casting or coating a polyurethane prepolymer prepared from 23.5 to 25.0 wt % of MDI, 18.0 to 20.0 wt % of PEG1000, 5.0 to 5.5 wt % of PTMG1000, 2.0 to 2.2 wt % of 1,4-butanediol, 1.2 to 1.5 wt % of ethoxylated bisphenol F diacrylate, 1.5 to 1.8 wt % of vinyltriethoxysilane, 0.20 to 0.25 wt % of dibutyltin dilaurate, 5.0 to 5.5 wt % of ethyl methyl carbonate, and ethyl acetate being the balance. 
     
     
         7 . The heat insulation cold closet for medical supplies according to  claim 6 , characterized in that the rigid polyurethane layer has a tensile strength of greater than 12 MPa and an elongation rate of 180 to 250%. 
     
     
         8 . The heat insulation cold closet for medical supplies according to  claim 6 , characterized in that the rigid polyurethane layer has a thickness of 0.1 mm. 
     
     
         9 . The heat insulation cold closet for medical supplies according to  claim 1 , characterized in that the vacuum heat insulation panel comprises a core material and a sealing layer, the core material being a panel which is formed from glass fibers and a getter composition and the interior of which is kept in vacuum; the core material is sealed with the sealing layer, which is formed from a first aluminum foil layer and a second aluminum foil layer laminated on the upper and lower surfaces of a PET film; the PET film has a thickness of 100 to 120 μm, and both the first and second aluminum foil layers have a thickness of 20 to 25 μm; and the first and second aluminum foil layers are anodized such that an anodized aluminum film is formed on each of them.