CN111925777A - Self-heating material and preparation method thereof - Google Patents
Self-heating material and preparation method thereof Download PDFInfo
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- CN111925777A CN111925777A CN202010424156.8A CN202010424156A CN111925777A CN 111925777 A CN111925777 A CN 111925777A CN 202010424156 A CN202010424156 A CN 202010424156A CN 111925777 A CN111925777 A CN 111925777A
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K5/00—Heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants; Materials for the production of heat or cold by chemical reactions other than by combustion
- C09K5/16—Materials undergoing chemical reactions when used
- C09K5/18—Non-reversible chemical reactions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/05—Metallic powder characterised by the size or surface area of the particles
- B22F1/052—Metallic powder characterised by the size or surface area of the particles characterised by a mixture of particles of different sizes or by the particle size distribution
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
- B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
- B22F2009/0824—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid with a specific atomising fluid
Abstract
The invention relates to a self-heating material and a preparation method thereof, wherein the self-heating material comprises aluminum powder A, aluminum powder B, sodium hydroxide, calcium oxide and sodium bicarbonate, the powder granularity and the purity of the aluminum powder A and the aluminum powder B are different, and the weight ratio of the sodium bicarbonate to the aluminum powder A is 20: 1-2: 1. The self-heating material can make the temperature of the upper layer water of the box rise to 90 ℃ within 10 minutes, the highest temperature can reach 95 ℃, and the standing time of 90-95 ℃ is 20 minutes. The invention is a self-heating material without fire, which can be used for heating loose and liquid food, etc.
Description
Technical Field
The invention belongs to the technical field of food product processing, and relates to a self-heating material and a preparation method thereof.
Background
Chinese people have their own characteristics in their living and eating habits, and often take hot food as the main food. However, with the pace of modern life increasing, people will live in a variety of convenient ways, such as working, camping, and traveling toward the home; or in some emergency situations, it is a home-like feeling to be able to have a hot gas vacation diet without sufficient time and power and open fire conditions for hot food. Therefore, self-heating food in which the pre-packaged food is heated by only adding cold water, by combining the self-heating material with water or an electrolyte solution, is increasingly favored.
Based on market demands, many related subjects have conducted research on self-heating materials, and CN201910730734.8 discloses: 25-35% of calcium oxide, 3-10% of corrosion inhibitor, 10-15% of sodium hydroxide, 3-5% of weight regulator, 38-45% of metal aluminum powder and 8-12% of metal magnesium powder, wherein the corrosion inhibitor can be sodium bicarbonate. In the scheme, two different metal powders of magnesium powder and aluminum powder are adopted, so that heating control is difficult, the aluminum powder is not fully reacted, and residues still exist.
And CN201910327105.0 discloses a heating composition, which is prepared by mixing the following substances in percentage by mass: 5 to 7 percent of 50 to 200 meshes of aluminum powder, 28 to 38 percent of 200-400 meshes of aluminum powder, 30 to 45 percent of calcium oxide powder, 1 to 3 percent of diatomite, 2 to 5 percent of polyethylene glycol (PEG 400-4000), 1 to 3 percent of sodium sulfate, 0.5 to 1 percent of coffee carbon powder, 2 to 4 percent of ethyl vanillin and 1 to 3 percent of lavender powder. In the scheme, the aluminum powder adopts two aluminum powders with different sizes and specifications, the reaction rate is increased by 200 meshes and 400 meshes, and the reaction heat release time is prolonged by 50 meshes to 200 meshes, but the reaction heat release of the materials mainly depends on the reaction heat release of the aluminum powder, the calcium oxide powder and water, the heat release quantity is insufficient, and the problem of residue after the reaction of each component is not controlled.
WO 2016186226A 1 adopts 300-350 mesh aluminum powder, 180-220 mesh aluminum powder, 300-350 mesh CaO, 180-220 mesh CaO, NaOH as self-heating materials, and also discloses a mixing method, wherein in step 1, 26.5-28.5 parts of 180-220 mesh aluminum powder, 16-20 parts of 300-350 mesh aluminum powder, and 10-12 parts of 300-350 mesh CaO are stirred and mixed, in step 2, 26.5-28.5 parts of 180-220 mesh aluminum powder and 10-12 parts of 180-220 mesh CaO are added into the stirring mixture in step 1 for further mixing; and 3, adding 3-7 parts of NaOH into the stirring mixture obtained in the step 2, and continuously stirring and mixing for 1-2 hours to obtain the self-heating material. The scheme adopts the large-particle-size aluminum powder, the heating starting is slow, the aluminum powder is not fully reacted, the component proportion, namely the mixing sequence cannot control the heating temperature change and the reaction residues, and the scheme still belongs to a rough heating scheme.
Therefore, in the prior art, the self-heating material is difficult to solve the problems of low heating starting speed, long reaction maintaining time and sufficient reaction at the same time, so that the reaction starting speed is low, the reaction is not thorough, when the using amount of strong alkali such as sodium hydroxide is large, the residual substances are thrown away and continue to react to cause environmental pollution and bring certain potential safety hazards, and even the heat supplied by some heating bags is not enough to heat food.
Disclosure of Invention
The invention aims to solve the problems and provides a self-heating material and a preparation method thereof. The purpose of the invention is mainly realized by the following technical scheme:
the self-heating material comprises aluminum powder A, aluminum powder B, sodium hydroxide, calcium oxide and sodium bicarbonate, wherein the granularity of the aluminum powder A is smaller than that of the aluminum powder B, the purity of the aluminum powder A is higher than that of the aluminum powder B, and the weight ratio of the sodium bicarbonate to the aluminum powder A is 20: 1-2: 1.
Further, in the self-heating material, the powder particle size of the aluminum powder A is less than 10 microns, and the powder particle size of the aluminum powder B is more than 50 microns.
Further, in the self-heating material, the weight ratio of the aluminum powder B to the aluminum powder A is 40: 1-6: 1.
Further, the powder particle size of the aluminum powder a is preferably 1 to 5 micrometers, or the powder particle size of the aluminum powder B is preferably 50 to 100 micrometers.
Further, the aluminum powder A and/or the aluminum powder B are/is atomized by adopting high-purity nitrogen of aluminum ingots, wherein the purity of the aluminum ingots for preparing the aluminum powder A is greater than that of the aluminum ingots for preparing the aluminum powder B, the spherical aluminum powder formed by atomizing the high-purity nitrogen with the purity of 99.98% is preferably adopted for the aluminum powder A, and the spherical aluminum powder formed by atomizing the aluminum ingots with the purity of 99.7% is preferably adopted for the aluminum powder B.
Further, the aluminum powder A accounts for 1-5% by mass, and the sodium bicarbonate accounts for 10-20% by mass.
Further, the aluminum powder B is 30-40% by mass.
The invention also provides a preparation method of the self-heating material, which comprises the following steps:
s1, preparing raw materials, wherein the raw materials comprise aluminum powder A, aluminum powder B, sodium hydroxide, calcium oxide and sodium bicarbonate, and the weight ratio of the sodium bicarbonate to the aluminum powder A is 20: 1-2: 1;
s2, drying, namely, independently separating the components of the raw materials, and vacuumizing and dehumidifying the components at the temperature of between 40 and 80 ℃ for 5 to 10 hours;
s3, mixing materials, namely mixing aluminum powder A, aluminum powder B and sodium hydroxide according to a ratio to form a mixture; mixing calcium oxide and sodium bicarbonate to form a mixture; and mixing the two mixtures to prepare the self-heating material.
Further, in the preparation method of the self-heating material, in the step of mixing the materials in the S3, the aluminum powder a and the sodium hydroxide are fully mixed and then mixed with the aluminum powder B.
Furthermore, the preparation method of the self-heating material comprises the steps of automatically subpackaging the prepared self-heating material into a certain weight and packaging the self-heating material into a self-heating material bag by adopting non-woven fabrics.
Compared with the prior art, the invention has the advantages of high starting and temperature rising speed, high temperature, adjustable duration, complete reaction and no residue, and can be used for heating loose liquid food and the like without open fire and self-heating.
Compared with the prior art, the invention has the following technical effects:
1. the starting time of the fine aluminum powder is short, but the fine aluminum powder is not well treated and is difficult to stir uniformly;
2. the specific mixing sequence is beneficial to fully mixing fine aluminum powder, so that the aluminum powder and the calcium oxide powder firstly react to release heat, the sodium bicarbonate provides a reaction environment, and the sodium bicarbonate reacts with an intermediate to supplement a reactant, so that the reaction is promoted to be thorough without residue.
3. The aluminum powder and the sodium hydroxide are more sufficient due to the mixing mode, so that the sodium hydroxide does not remain in reaction, and meanwhile, the sodium hydroxide can be generated in the reaction process by adding the sodium hydroxide and a specific proportion, so that the use of sodium hydroxide which is a dangerous product is reduced;
4. the reaction of calcium oxide with water, aluminum powder and sodium hydroxide allows for longer hold times.
Therefore, the invention adopts the specific aluminum powder particle size, innovativeness, specific mixing sequence and the use of sodium bicarbonate to simultaneously achieve the technical effects of quick heating starting time, long duration and full reaction of all components, especially strong alkali, without residue.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments.
The invention relates to a self-heating material which comprises aluminum powder A, aluminum powder B, sodium hydroxide, calcium oxide powder and sodium bicarbonate, wherein the particle size of the aluminum powder A is smaller than that of the aluminum powder B. The surface activity of the aluminum powder with different powder particle sizes is different, and the difference affects the reaction speed of the aluminum powder and the sodium hydroxide and further affects the heating starting efficiency. Compared with the self-heating material prepared by adopting the aluminum powder with single powder granularity, the self-heating material prepared by utilizing the aluminum powder with different powder granularities can control the heating temperature under the condition of the same weight, the reaction starting time is shortened by half, the heating speed is increased, and the highest heating temperature is greatly increased. The inventors also noted the following facts: when the self-heating material is prepared by using the aluminum powder with different powder particle sizes, new challenges are brought to the self-heating material, such as insufficient reaction of the aluminum powder, increased content of other components and the like. The above problems can be improved by adding a specific content of sodium bicarbonate to the self-heating material of the present invention. The invention also notices that the content of the sodium bicarbonate has great influence on the heating performance of the self-heating material, the sodium bicarbonate with specific content is beneficial to improving the space structure of the self-heating material in the reaction process, increasing the contact area of reactants, avoiding insufficient reaction, and can react with intermediate products to supplement raw materials to further promote the reaction and heat release of the aluminum powder. The invention finds that the beneficial effect brought by the sodium bicarbonate is influenced by the content of the aluminum powder A, when the weight ratio of the sodium bicarbonate to the aluminum powder A is 20: 1-2: 1, the beneficial effect is exerted, but the weight ratio of the sodium bicarbonate to the aluminum powder A is less than 2:1 or more than 20:1, the heat generation performance of the self-heating material is affected.
In the self-heating material of the present invention, the powdery particle size of the aluminum powder a is preferably less than 10 micrometers, preferably 1 to 5 micrometers of spherical aluminum powder. Reducing the powder particle size of the aluminum powder a is advantageous for improving the heat generation starting speed, but too small particle size poses a challenge to the composition of the self-heating material and the preparation method. Meanwhile, the inventors have noticed that merely changing the powder particle size of the aluminum powder a does not improve the composition and the preparation method of the self-heating material, which may adversely affect the duration of heat generation and the reaction efficiency, and even increase the overall cost of the self-heating material. The granularity of the aluminum powder B is preferably spherical aluminum powder with granularity larger than 50 microns, preferably 50-100 microns, the granularity of the aluminum powder B has the functions of prolonging the heating reaction of the self-heating material and regulating and controlling the heat preservation time, the granularity of the aluminum powder B is not excessively large, preferably less than 100 microns, the highest heating temperature can be improved, and the reaction temperature can be prevented from being too long.
The aluminum powder A and/or the aluminum powder B of the self-heating material are/is atomized by adopting high-purity nitrogen of aluminum ingots, wherein the purity of the aluminum ingots for preparing the aluminum powder A is higher than that of the aluminum ingots for preparing the aluminum powder B. The inventor notices that the purity of the aluminum powder can increase the surface activity of the aluminum powder and improve the reaction efficiency, the aluminum powder A is atomized by adopting high-purity nitrogen of an aluminum ingot with higher purity, the purity of the aluminum ingot is preferably 99.98%, the starting speed is further accelerated by improving the purity of the aluminum powder while the granularity of the aluminum powder is reduced, and the heating performance is improved. The aluminum powder B is preferably formed by nitrogen atomization of aluminum ingots with the purity of 99.7 percent, and the reaction of the aluminum powder B and sodium hydroxide can be prolonged, so that the function of regulating and controlling the heat preservation time is realized.
The inventor notices that the weight matching of the aluminum powder A and the aluminum powder B can change the heating starting speed and the reaction maintaining time of the self-heating material, and the reasonable configuration of the contents of the aluminum powder A and the aluminum powder B is one of the keys for further improving the performance of the self-heating material. The weight ratio of the aluminum powder A to the aluminum powder B is preferably 40: 1-6: 1, the reaction starting speed can be increased, the heating reaction duration and the reaction are ensured to be sufficient, the aluminum powder A is preferably 1-5%, and the aluminum powder B is preferably 30-40%.
Further, the self-heating material of the invention comprises the following components in percentage by mass: 1 to 5 percent of aluminum powder A, 30 to 40 percent of aluminum powder B3, 1 to 2 percent of sodium hydroxide, 40 to 50 percent of calcium oxide powder and 10 to 20 percent of sodium bicarbonate. Preferably, the aluminum powder A accounts for 1% -5%, the aluminum powder B3 accounts for 30% -40%, the sodium hydroxide accounts for 1% -2%, the calcium oxide powder accounts for 40% -50%, and the sodium bicarbonate accounts for 1% -5%.
The invention also provides a preparation method of the self-heating material, which comprises the following steps:
s1, preparing raw materials, wherein the raw materials comprise aluminum powder A, aluminum powder B, sodium hydroxide, calcium oxide and sodium bicarbonate, and the weight ratio of the sodium bicarbonate to the aluminum powder A is 20: 1-2: 1;
s2, drying, namely, independently separating the components of the raw materials, and vacuumizing and dehumidifying the components at the temperature of between 40 and 80 ℃ for 5 to 10 hours;
s3, mixing materials, namely mixing aluminum powder A, aluminum powder B and sodium hydroxide according to a ratio to form a mixture; mixing calcium oxide and sodium bicarbonate to form a mixture; and mixing the two mixtures to prepare the self-heating material.
The invention adopts a specific sequence mixing method, firstly two kinds of aluminum powder and sodium hydroxide are mixed, calcium oxide powder and sodium bicarbonate are mixed, then the two kinds of aluminum powder and the calcium oxide powder are mixed to prepare the self-heating material, during the reaction process, the aluminum powder and the calcium oxide powder firstly react to release heat, the sodium bicarbonate provides a reaction environment, and the sodium bicarbonate reacts with an intermediate to supplement a reactant, so that the reaction is promoted to be thorough without residue. The above-described sequential mixing method can bring unexpected technical effects that the reaction start-up time is further reduced by half, the initial heat release rate is increased by more than 20%, and the heat release duration is more stable.
Further, in the preparation method of the self-heating material, in the step of mixing the materials in S3, the aluminum powder a and the sodium hydroxide are fully mixed and then mixed with the aluminum powder B, and the inventors have noticed that the aluminum powder a having a smaller powder particle size preferentially reacts with the sodium hydroxide, and the heat generation performance of the self-heating material can be further improved.
Furthermore, the preparation method of the self-heating material comprises the steps of automatically subpackaging the prepared self-heating material into a certain weight and packaging the self-heating material into a self-heating material bag by adopting non-woven fabrics.
The invention also relates to a self-heating material bag prepared by the preparation method, wherein 100 g of the self-heating material bag is put into a self-heating special box, the box is divided into an upper layer and a lower layer, the lower layer is a self-heating material bag reaction area, and the upper layer is a self-heating material bag heating area. The upper layer and the lower layer of the box are both added with ice water mixed water at 4 ℃, wherein the water added in the lower layer is 300ml, and the water added in the upper layer is 800 ml. The timing is started after water is added, the temperature rise is started within 1 minute, the water temperature of the upper box can rise to 90 ℃ within 10 minutes, the highest temperature can reach 95 ℃, and the time for the upper box to stay 90-95 ℃ is 20 minutes.
One, examples 1 to 4 and comparative examples 1 to 4
In examples 1-4, the aluminum powder A is spherical aluminum powder with the granularity of 1-5 microns of high-purity nitrogen atomized powder with the purity of 99.98 percent, the aluminum powder B is spherical aluminum powder with the granularity of 50-100 microns of industrial grade nitrogen atomized powder with the purity of 99.7 percent, sodium hydroxide, calcium oxide powder and sodium bicarbonate, and the raw materials are separately placed at 40-80 ℃ for vacuumizing and dehumidifying for 5-10 hours; then mixing the two aluminum powders in the proportion with sodium hydroxide, mixing calcium oxide with sodium bicarbonate, and then mixing the two to prepare a self-heating material; and finally, automatically subpackaging the prepared self-heating material into a certain weight, and packaging the self-heating material into a self-heating material bag by adopting non-woven fabrics. In comparative examples 1-2, aluminum powder A was not added, but replaced with aluminum powder B added in the same weight percentage, and in comparative examples 3-4, sodium bicarbonate was not added or an excess amount of sodium bicarbonate was added. The self-heating material bag of 100 g is added with ice water mixed water at 4 ℃, and the start temperature rise time, the temperature rise process and the highest temperature are observed.
TABLE 1 examples 1-4 and comparative examples 1-2
As can be seen from Table 1 above, in comparative examples 1-2, when the addition of aluminum powder A was omitted and the addition of aluminum powder B was increased accordingly, the reaction start time increased nearly twice, the temperature rise time continued until 20 minutes before the maximum temperature appeared, and the maximum temperature reached the 95 ℃ requirement. The invention adopts a small amount of aluminum powder A to replace the aluminum powder B, and has obvious effects on the aspects of starting time, highest temperature and duration of 90-95 ℃. Comparative examples 3 to 4 when sodium bicarbonate was not in the specified range, no matter whether the amount added was less than the specified value (comparative example 3) or more than the specified value (comparative example 4), even if the aluminum powder a and the calcium oxide powder were added, the start-up time could not be accelerated and the maximum temperature could not be increased.
Second, example 5 and comparative example 5
In example 5, the aluminum powder a is spherical aluminum powder with a purity of 99.98% and a particle size of high-purity nitrogen atomized powder of 1-5 microns, and the aluminum powder B is spherical aluminum powder with a purity of 99.7% and a particle size of industrial nitrogen atomized powder of 50-100 microns, sodium hydroxide, calcium oxide powder and sodium bicarbonate; the raw materials are separately placed at 40-80 ℃ for vacuum pumping and dehumidification for 5-10 hours; then mixing the two aluminum powders in the proportion with sodium hydroxide, mixing calcium oxide with sodium bicarbonate, and then mixing the two to prepare a self-heating material; and finally, automatically subpackaging the prepared self-heating material into a certain weight, and packaging the self-heating material into a self-heating material bag by adopting non-woven fabrics. In comparative example 3, the self-heating material was prepared by mixing all the raw materials in the above ratio together without using a sequential mixing manner, and was automatically sub-packaged into the same weight and packaged into a self-heating material pack using a non-woven fabric. The self-heating material bag of 100 g is added with ice water mixed water at 4 ℃, and the start temperature rise time, the temperature rise process and the highest temperature are observed.
Table 2 example 5 and comparative example 5
As can be seen from Table 2 above, in comparative example 5, the spontaneous heating material is prepared by mixing all the raw materials in the above ratio together without using the sequential mixing manner, compared with the spontaneous heating material prepared by mixing two kinds of aluminum powders in the above ratio with sodium hydroxide, calcium oxide and sodium bicarbonate, and then mixing them in the example 5, the reaction start time is increased by about two times, the duration and the occurrence maximum temperature are much more, and the maximum temperature does not reach 95 ℃. The invention adopts a sequential material mixing mode, and has obvious effects on the aspects of starting time, highest temperature and duration time of 90-95 ℃.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make many possible variations and modifications to the disclosed embodiments, or equivalent modifications, without departing from the spirit and scope of the invention, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent replacement, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention.
Claims (10)
1. A self-heating material is characterized in that: the self-heating material comprises aluminum powder A, aluminum powder B, sodium hydroxide, calcium oxide and sodium bicarbonate, wherein the granularity of the aluminum powder A is smaller than that of the aluminum powder B, and the purity of the aluminum powder A is higher than that of the aluminum powder B; the weight ratio of the sodium bicarbonate to the aluminum powder A is 20: 1-2: 1.
2. The self-heating material as claimed in claim 1, wherein the powder particle size of the aluminum powder A is less than 10 μm, and the powder particle size of the aluminum powder B is more than 50 μm.
3. The self-heating material as claimed in claim 1 or 2, wherein the aluminum powder A and/or the aluminum powder B are/is atomized with high-purity nitrogen gas from an aluminum ingot, wherein the purity of the aluminum ingot for preparing the aluminum powder A is higher than that of the aluminum ingot for preparing the aluminum powder B.
4. The self-heating material as claimed in claim 1 or 2, wherein the weight ratio of the aluminum powder B to the aluminum powder A in the self-heating material is 40:1 to 6: 1.
5. The self-heating material as claimed in claim 1 or 2, wherein the powder particle size of the aluminum powder a is preferably 1 to 5 μm, or the powder particle size of the aluminum powder B is preferably 50 to 100 μm.
6. The self-heating material as claimed in claim 1 or 2, wherein the aluminum powder A is 1-5% by mass, and the sodium bicarbonate is 10-20% by mass.
7. The self-heating material as claimed in claim 7, wherein the aluminum powder B is 30 to 40 mass%.
8. A method for preparing a self-heating material according to any one of claims 1 to 7, wherein: the preparation method comprises the following steps:
s1, preparing raw materials, wherein the raw materials comprise aluminum powder A, aluminum powder B, sodium hydroxide, calcium oxide and sodium bicarbonate, and the weight ratio of the sodium bicarbonate to the aluminum powder A is 20: 1-2: 1;
s2, drying, namely, independently separating the components of the raw materials, and vacuumizing and dehumidifying the components at the temperature of between 40 and 80 ℃ for 5 to 10 hours;
and S3, mixing the materials, namely mixing the aluminum powder A, the aluminum powder B and sodium hydroxide according to a ratio to form a mixture, mixing the calcium oxide and the sodium bicarbonate to form a mixture, and mixing the two mixtures to prepare the self-heating material.
9. A method of making according to claim 8, wherein: in the step of mixing materials of S3, the aluminum powder A and the sodium hydroxide are fully mixed and then mixed with the aluminum powder B.
10. A method of preparing as claimed in claim 8 or 9, wherein: the preparation method of the self-heating material further comprises the steps of automatically subpackaging the prepared self-heating material into a certain weight and packaging the self-heating material into a self-heating material bag by adopting non-woven fabrics.
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| US20150251838A1 (en) * | 2014-03-07 | 2015-09-10 | Dave Huselton | System and Method for Heating Items |
| CN110079281A (en) * | 2019-04-23 | 2019-08-02 | 中国计量大学 | A kind of novel self-heating food heating pack and preparation method thereof |
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| CN115820124A (en) * | 2022-12-12 | 2023-03-21 | 湖州市南浔区绿色家居产业研究院 | Quick-drying process of water-based UV coating |
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