Refrigeration – Storage of solidified or liquified gas
Patent
1996-07-24
1999-11-16
MacMillan, Keith D.
Refrigeration
Storage of solidified or liquified gas
62440, 62451, 312401, 312400, F17C 1100, F25D 1100, F25D 2306, A47B 9604
Patent
active
059836474
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a foamed thermal-insulating material used in insulating devices such as refrigerators, freezers, etc. and to an insulated structure utilizing the foamed thermal-insulating material.
BACKGROUND OF THE INVENTION
Recently, environmental issues such as the destruction of the ozone layer and global warming, which are influenced by Chloro Fluoro Carbons (CFCs), are receiving close attention. For this reason, reduction in the use of CFCs as a foaming agent has become a very important issue.
Therefore, since hard urethane foam is the leading foamed thermal-insulating material, it is proposed to use a hydrocarbon foaming agent which does not include a halogen molecule.
However, a hydrocarbon is not easily applied as a foaming agent because of combustibility safety, thermal-insulating efficiency quality, and so on. Further, a foamed thermal-insulating material made using a hydrocarbon as a foaming agent is less effective than the foamed thermal-insulating material made by using the present CFC11 foaming agent.
SUMMARY OF THE INVENTION
Concerning the above mentioned problem, the present invention aims to provide the foamed thermal-insulating material and the insulated structure filled with the foamed thermal-insulating material that are not inferior to the present foamed thermal-insulating material made by using the CFC11 foaming agent in terms of combustibility safety, thermal-insulating efficiency quality, and so on, when a hydrocarbon is applied as a foaming agent.
To achieve the above mentioned goal, the present invention aims to restrain combustibility of the foamed thermal-insulating material and to prevent the release of halides, which are a cause of acid rain, by adding a non-halogenated organophosphorus compound as an additive to the raw materials of the foamed thermal-insulating material which includes a hydrocarbon foaming agent such as pentane and/or cyclopentane.
In addition, a non-halogenated organophosphorus compound having a molecular weight over 150 as an additive with an OH group as a functional group is reacted and polymerized to an organic polyisocyanates in order to eliminate the possibilities of phosphor corrosion by free ionization to the metal pipes which are disposed inside of the insulated structure and to eliminate the possibilities of food contamination by phosphorus transfer through the plastic board.
Also, organic polyisocyanates that have been polymerized by a non-halogenated organophosphorus compound with active hydrogen are used as the raw materials of the foamed thermal-insulating material which includes a hydrocarbon such as pentane and/or cyclopentane as a foaming agent, in order to restrain combustibility of the foamed thermal-insulating material and to prevent the release of halides, which are a cause of acid rain, caused by the burning of the foamed material for disposal purposes. Further, this composition helps eliminate the possibilities of phosphor corrosion by free ionization to the metal pipes which are disposed inside of the insulated structure, and helps eliminate the possibilities of food contamination by phosphorus transfer through the plastic board despite retaining a phosphor component in the urethane resin.
A Polyol component including at least 5% or more of polyether-polyol, which is obtained from the additional polymerization of ethylenediamine and alkylene-oxide with a hydroxyl value of 350-650 mg KOH/g, is used as the raw materials for the foamed thermal-insulating material which includes a hydrocarbon such as pentane and/or cyclopentane as a foaming agent, in order to improve mutual solubility between a polyol component and a hydrocarbon foaming agent. This maintains the quality of the foamed thermal-insulating material by having a foaming agent equally soluble to the raw material components. Further, this composition improves the insulating efficiency of the foamed thermal-insulating material by raising the addition ratio of a hydrocarbon foaming agent to lower amounts of a co-foaming agent, such as
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Nakamoto Hideo
Tenra Tomohisa
Tsuda Yoshiyuki
Uekado Kazutaka
MacMillan Keith D.
Matsushita Refrigeration Company
Ricigliano Joseph W.
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