| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an exothermic agent, in which the mobility of water molecules to the inside of the exothermic agent is enhanced, while many number of pores are formed on the surface of a composite compound generated by exothermic reaction to have water molecules penetrate into the exothermic agent without hindrance. <P>SOLUTION: The exothermic agent is prepared as: an aluminum metal powder mixed with one or more selected from calcium oxide, calcium hydroxide and soda lime is added with 1-15 wt.%, preferably 1-3 wt.%, of one or more of percarbonates or a metal salt such as sodium chloride and sodium carbonate and is mixed uniformly by a mechanical means to form a number of pores on the surface of a hard composite compound generated at the initial reaction stage of the exothermic reaction with water in order to penetrate water molecules swiftly while bubbling of a gas on the surface of an aluminum powder is set to be performed to eliminate reaction inhibitions by reaction products. By the above procedure, the exothermic agent comprising an aluminum metal powder and metal salts as major components with a starting time of 10-15 seconds before heat generation, 100 degrees of the maximum temperature of water vapor, the amount of heat generation of 20-30% higher and a retention time of 40-50% longer for exothermic activity compared to those of a conventional aluminum-based exothermic agent. <P>COPYRIGHT: (C)2008,JPO&INPIT</p> |
