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non-aqueous heat transfer fluid

A technology of heat conduction and fluid, which is applied in the field of coolant for internal combustion engines, can solve the problems of using cooling system components and engine disasters, corrosion of engine and cooling system components, blockage of radiators and heater cores, etc., to eliminate pollution problems and reduce Coolant loss, effect of reducing toxicity levels

Inactive Publication Date: 2002-11-13
EVANS COOLING SYST INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Supplementary coolant additives must be chemically balanced with the volume of the coolant, and the use of supplementary additives to coolant is costly, and improper use can bring disaster to the components of the cooling system and the engine
Corrosion and cavitation of engine and cooling system components can occur with too little amount of supplementary additive in the coolant, while too much can cause the additive to "split" out of solution, plugging radiator and heater cores
Another disadvantage of supplementary additives for coolants is their poor solubility in aqueous solutions
[0029] Also, some additives are considered toxic in their own right, such as borates, phosphates, and nitrites

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific example

[0059] %(weight)

[0060] 1) 1,2-propanediol, commonly known as propylene glycol (PG) 84.50-99.85

[0061] 2) Azole inhibitors, such as tolyltriazole, etc. 0.05-5.0

[0062] 3) Nitrate inhibitors, such as sodium nitrate, etc. 0.05-5.0

[0063] 4) Molybdate, such as sodium molybdate, etc. 0.05-5.0

[0064] 5) Water (as an undesired impurity) 0.00-0.5

[0065]More preferably, in the above-mentioned coolant formula, the concentration of propylene glycol is greater than 99.0% (weight), the molybdate is composed of sodium molybdate, and its concentration is 0.3% (weight), and the nitrate is composed of sodium nitrate, and its concentration is 0.3% by weight, the azole compound consists of tolyltriazole at a concentration of 0.3% by weight.

[0066] The following representative embodiments demonstrate the advantages of the invention. Here, the composition of the present invention is represented by "A", the existing antifreeze composition is...

Embodiment 1

[0081] [ASTM #D-1384 (improved)]

[0082] The first example is a corrosion test of an engine coolant in glassware. illustrate:

[0083] Samples of six metals typical of those found in engine coolant systems were completely immersed in the test coolant. It is normal practice to blow air bubbles throughout the glassware to ventilate the coolant and maintain the test temperature at 190°F (88°C) for 336 hours. However, this test (the results of which are listed in the table below) was modified as follows in order to more effectively demonstrate the advantages of the present invention. Thus, two test coolants ("A" and "B") were operated at a controlled temperature of 215°F (101.6°C) to simulate use under severe operating conditions, and the coolants of the present invention were tested without ventilation , in order to more closely approximate its operation in non-aqueous cooling systems as described in US Patents 4,550,694, 4,630,572 and 5,031,579. However, for th...

Embodiment 2

[0106] 〔ASTM #D-4340 (improved)〕

[0107] This embodiment is to test the corrosion of cast aluminum or magnesium alloy in engine coolant under the condition of heat dissipation. illustrate:

[0108] A sample of a typical cast aluminum alloy for an engine cylinder head or component was contacted with an engine coolant solution at a temperature of 275°F (135°C) and a pressure of 28 psi (193 kPa). An ASTM specified corrosive water was used to make up the water portion of the unmodified 50 / 50 EG-water test coolant sample (Coolant "B"). The tests used for a sample of the coolant of the present invention (Coolant "A") were modified to simulate real operating conditions. Therefore, not only was corrosive water not used (to make the operating conditions non-aqueous), but the test pressure was reduced to near atmospheric pressure, 2 psi (13.79 kPa).

[0109] Heat flow is passed through the metal sample and tested for one week or 168 hours. Thermal conduction corrosion ...

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Abstract

A nonaqueous engine coolant utilizes propylene glycol and propylene glycol-soluble corrosion-inhibiting additives which do not require water to enter into or remain in solution thereby reducing toxicity levels and corrosiveness exhibited by aqueous coolants.

Description

Background of the invention [0001] The present invention relates generally to non-aqueous heat transfer fluids for use in heat exchange systems and, in particular, to coolants for internal combustion engines. [0002] Currently used coolants create persistent environmental concerns and raise concerns about their toxicity, health effects, and disposal issues. Specifically, coolant toxicity leading to acute short-term oral hygiene effects in humans and other mammals is problematic. In addition, chronic health problems associated with coolants often involve poisoning from precipitation of heavy metal elements. [0003] Each year, approximately 700 million gallons of antifreeze are sold in the U.S. alone and approximately 1.2 billion gallons worldwide. It is estimated that 25-50% of the total volume of coolants currently in use is mishandled, which exacerbates the inherent toxicity problems of coolants. A major cause of this contamination is consumer dumping of coolant. While ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K5/20C09K5/08C23F11/14C23F11/18
CPCC09K5/20
Inventor 约翰·W·伊万斯
Owner EVANS COOLING SYST INC
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