Magnesium-iron self-heating powder capable of efficiently self-heating food and preparation process of magnesium-iron self-heating powder

Abstract

The invention relates to magnesium-iron self-heating powder capable of efficiently self-heating food and a preparation process of the magnesium-iron self-heating powder. According to the magnesium-iron self-heating powder capable of efficiently self-heating food, the powder is of a roll core structure, and continuous iron wires are evenly wrapped in every two adjacent layers of magnesium sheets; the thickness of a single-layer magnesium sheet in the powder is not more than 1mm; the diameter of the iron wire in the powder does not exceed 0.5 mm; the powder also comprises sodium chloride or potassium chloride; and the powder further comprises aluminum powder and / or quick lime. According to the preparation process of the magnesium-iron self-heating powder, magnesium and iron are effectively fixed together by adopting a multiple folding and rolling method, utilizing an extrusion plastic deformation effect and combining a roll core structure so as to form the high-activity magnesium-iron self-heating powder, so that the starting and reaction speed of a self-corrosion reaction are adjusted, efficient heating of self-heating food is realized, and the self-heating powder is suitable for large-scale rapid popularization.

Description

technical field [0001] The invention belongs to the field of food self-heating powder, and in particular relates to a magnesium-iron self-heating powder capable of efficiently self-heating food and a preparation process thereof. Background technique [0002] In recent years, the rapid rise of foods such as self-heating hot pot and self-heating rice has increased the demand for self-heating powder used to provide heating heat. Self-heating powder generates a large amount of heat in a short time through a fast chemical reaction to provide a heat source for the heated food. Super-corrosion alloy materials will release a large amount of heat and hydrogen during the corrosion process, so they can be used for heating food. Magnesium-iron self-heating powder is a typical representative of this type of super-corrosion alloy material. The electrode potential of Mg is -2.37V, and the electrode potential of Fe is -0.44 V. Many micro-electrodes are produced in the medium to form a mic...

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Problems solved by technology

However, with the increase of production batches, the magnesium-iron self-heating powder prepared by this method has the following problems: First, it is difficult to control the particle size uniformity of the magnesium-iron self-heating powder, and in the process of ball milling, there will be A large number of invalid powders that are too large or too small, some are oxidized due to repeated ball milling due to too large a particle size, and some cannot form an effective magnesium-iron bond because the particle size is too small, and an excessively large particle size range is not conducive to the packaging and use of self-heating powder in the later stage The second is that the ratio and distribution of the two main elements of magnesium and iron in the magnesium-iron alloy powder are difficult to effectively control. The particle size of the iron powder on the surface of some magnesium powders is uneven, the surface distribution is uneven, and the proportion of iron powder distributed on the surface of different magnesium powders is different. Larger, eventually leading to the self-corrosion reaction process, either the reaction start-up speed is fast or slow, or the amount of remaining magnesium-iron powder after the reaction is uncontrollable, and some even have the problem that the magnesium powder obviously does not participate in the reaction and a large amount of residue remains

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