Solid fuel

Abstract

The invention is a solid fuel. Provided is a solid fuel which does not solidify during heat mixing, can be suitably produced, and can sufficiently maintain the shape during combustion. A solid fuel characterized by containing at least one compound (A) selected from the group consisting of a polyalkylene glycol having an alkylene group having 4 or less carbon atoms, an alkyl ether of a (poly) alkylene glycol having an alkylene group having 4 or less carbon atoms, and an aryl ether of a (poly) alkylene glycol having an alkylene group having 4 or less carbon atoms.

Description

(19) State Intellectual Property Office (12) Invention Patent Application (10) Application Publication Number (43) Application Publication Date (21) Application Number 202510646422.4 (22) Application Date 2025.05.20 (30) Priority Data 2024-101129 2024.06.24 JP (71) Applicant: Shintaka Co., Ltd. Address: Japan (72) Inventors: Tomotsugu Yasuda, Hiroaki Noguchi (74) Patent Agency: Beijing Linda Liu Intellectual Property Agency (General Partnership) 11277 Patent Attorneys: Liu Xinyu, Li Maojia (51) Int.Cl. C10L 7 / 04 (2006.01) (54) Invention Title: Solid Fuel (57) Abstract: This invention is a solid fuel. This invention provides a solid fuel that does not solidify when heated and mixed, can be properly prepared, and can maintain its shape sufficiently during combustion. A solid fuel, characterized in that it comprises at least one compound (A) selected from the group consisting of polyalkylene glycols having alkylene atoms of 4 or fewer carbon atoms, alkyl ethers of (poly)alkylene glycols having alkylene atoms of 4 or fewer carbon atoms, and aryl ethers of (poly)alkylene glycols having alkylene atoms of 4 or fewer carbon atoms. Claims 1 page Description 13 pages CN 121203730 A 2025.12.26 CN 1 21 20 37 30 A 1. A solid fuel, characterized in that it comprises at least one compound (A) selected from the group consisting of polyalkylene glycols having alkylene atoms of 4 or fewer carbon atoms, alkyl ethers of (poly)alkylene glycols having alkylene atoms of 4 or fewer carbon atoms, and aryl ethers of (poly)alkylene glycols having alkylene atoms of 4 or fewer carbon atoms. 2. The solid fuel according to claim 1, wherein the mass proportion of said compound (A) is 1 to 25 by mass. 3. The solid fuel according to claim 1 or 2, comprising at least one monohydric alcohol (B) selected from the group consisting of methanol, ethanol and propanol. 4. The solid fuel according to claim 3, wherein the monohydric alcohol (B) is present in a mass percentage of 70% or less. 5. The solid fuel according to claim 1 or 2, comprising a fatty acid (salt) (C). 6. The solid fuel according to claim 5, wherein the mass percentage of the fatty acid (salt) (C) converted to sodium fatty acid is 3 to 26% by mass. 7. The solid fuel according to claim 1 or 2, comprising water. 8. The solid fuel according to claim 7, wherein the mass percentage of water is 1 to 35% by mass. Claims 1 / 1 page 2 CN 121203730 A Solid Fuel Technical Field

[0001] This invention relates to solid fuels. Background Art

[0002] As fuels for heating cooked food, etc., it is known that resin films in cylindrical or prismatic shapes are densely packed...Solid fuel is a solid fuel whose main body is packaged in outer packaging materials such as aluminum foil. Solid fuel is mainly used in single-person hot pot, primarily in tourist hotels, and in recent years it has also been widely used in beef bowl chain restaurants, Japanese restaurants, etc. In addition, solid fuel can also be used as an ignition agent for charcoal (wood charcoal) in barbecues.

[0003] For example, Patent Document 1 discloses a solid fuel containing 50-90% by mass of a specified monohydric alcohol (A), a specified polyhydric alcohol and / or water (B), and 3-20% by mass of a specified fatty acid salt (C), and discloses that the solid fuel has excellent storage stability and is suitable for use as a solid fuel. In addition, Patent Document 2 discloses a solid fuel containing an alcohol (A) and a fatty acid (salt) (B). The solid fuel has an alkalinity index of -2.0 to 1.0, and the content of the monohydric alcohol is less than 85% by mass. For the aforementioned fatty acid (salt) (B), the total mass ratio of fatty acids and the mass ratio of fatty acid salts converted to fatty acids is 9% by mass or more. It contains fatty acid (salt) (B-1) with 18 or more carbon atoms and fatty acid (salt) (B-2) with 17 or fewer carbon atoms. The molar ratio of (B-1) / (B-2) is 0.01 or more and 70 or less. The solid fuel is disclosed to have basic properties such as ignition and fire intensity, and high hardness.

[0004] Prior Art Documents

[0005] Patent Documents

[0006] Patent Document 1: Japanese Patent Application Publication No. 2023-065055

[0007] Patent Document 2: Japanese Patent Publication No. 7410604 Summary of the Invention

[0008] Problems to be Solved by the Invention

[0009] Solid fuels are generally manufactured by mixing and neutralizing their constituent components while heating in a mixing tank, followed by cooling and solidification. However, it is required that solidification does not occur during heating and mixing. In addition, it is required that the shape of the solid fuel be adequately maintained during combustion. For example, it is required that even when the prepared solid fuel is burned without being packaged by outer packaging material after a certain period of time, the melting of the solid fuel itself and the spread of fire are adequately prevented. That is, it is required to achieve a good balance between the two characteristics of not solidifying during heating and mixing and being able to adequately maintain the shape of the solid fuel during combustion.

[0010] The present invention was made to solve the above-mentioned problems, and its object is to provide a solid fuel that can be properly prepared without solidifying during heating and mixing, and which can adequately maintain its shape during combustion.

[0011] Solution to the problem

[0012] In order to achieve the above-mentioned object, the present invention (1) is a solid fuel, characterized in that it comprises at least one compound (A) selected from the group consisting of polyalkylene glycols having 4 or fewer carbon atoms, alkyl ethers of (poly)alkylene glycols having 4 or fewer carbon atoms, and aryl ethers of (poly)alkylene glycols having 4 or fewer carbon atoms.

[0013] It should be noted that (poly)alkylene glycol is selected from at least one of the groups consisting of alkylene glycol, dialkylene glycol, and polyalkylene glycol. Specification 1 / 13 page 3 CN 121203730 A

[0014] The solid fuel of the present invention can be properly prepared without solidification when heated and mixed, and can maintain its shape sufficiently during combustion. It should be noted that even when the solid fuel of the present invention is burned without being packaged by outer packaging material after a certain period of time, it can maintain its shape sufficiently during combustion. Thus, the reason why the solid fuel of the present invention can be properly prepared without solidification when heated and mixed, and can maintain its shape sufficiently during combustion is not yet clear, but it is believed that the reason is that by using a compound with fewer carbon atoms in the alkylene group and having an ether group as component (A), the curing temperature can be appropriately adjusted, etc.

[0015] It should be noted that in this specification, solid means having solid properties, and also includes the concept of gel.

[0016] The present invention (2) is a solid fuel of the present invention (1) in which the mass ratio of the above-mentioned compound (A) is 1 to 25% by mass.

[0017] The above-mentioned mass ratio is the total mass ratio when the solid fuel contains two or more of the above-mentioned compounds (A).

[0018] As a result, the effects of the present invention are more significant.

[0019] The present invention (3) is a solid fuel of the present invention (1) or (2) in which at least one monohydric alcohol (B) selected from the group consisting of methanol, ethanol and propanol is contained.

[0020] The present invention (4) is a solid fuel of the present invention (3) in which the mass ratio of the above-mentioned monohydric alcohol (B) is 70% by mass or less.

[0021] The above-mentioned mass ratio is the total mass ratio when the solid fuel contains two or more of the above-mentioned monohydric alcohol (B).

[0022] When the mass ratio of the above-mentioned monohydric alcohol (B) is 70% by mass or less, it is usually difficult to maintain its shape sufficiently during combustion, but the solid fuel of the present invention, by containing the above-mentioned component (A), can maintain its shape sufficiently during combustion. That is, it can be said that when the mass percentage of the above-mentioned monohydric alcohol (B) is 70% by mass or less, the effect of the present invention in maintaining its shape sufficiently during combustion becomes significant.

[0023] The present invention (5) is a solid fuel containing fatty acid (salt) (C) as described in any one of the present invention (1) to (4).

[0024] The fatty acid (salt) is a fatty acid and / or a fatty acid salt.

[0025] The present invention (6) is a solid fuel as described in the present invention (5) where the mass percentage of the above-mentioned fatty acid (salt) (C) converted to sodium fatty acid is 3 to 26% by mass.

[0026] In this specification, the mass percentage of fatty acid (salt) (C) is the fatty acid (salt) in 100% by mass of the solid fuel.The mass ratio of sodium fatty acids converted to the same molar number. In addition, when the solid fuel contains two or more of the above-mentioned fatty acids (salts) (C), the above-mentioned mass ratio is the total mass ratio of the mass ratio of each converted to the same molar number of sodium fatty acids.

[0027] The present invention (7) is a solid fuel containing water as described in any one of the present invention (1) to (6).

[0028] The present invention (8) is a solid fuel as described in the present invention (7) with the above-mentioned water mass ratio being 1 to 35% by mass.

[0029] Effects of the invention

[0030] The solid fuel of the present invention can be properly prepared and can maintain its shape sufficiently during combustion. Detailed description

[0031] The solid fuel of the present invention contains at least one compound (A) selected from the group consisting of polyalkylene glycol having 4 or fewer carbon atoms, alkyl ether of (poly)alkylene glycol having 4 or fewer carbon atoms, and aryl ether of (poly)alkylene glycol having 4 or fewer carbon atoms.

[0032] Hereinafter, at least one compound (A) selected from the group consisting of polyalkylene glycols having 4 or fewer carbon atoms, alkyl ethers of (poly)alkylene glycols having 4 or fewer carbon atoms, and aryl ethers of (poly)alkylene glycols having 4 or fewer carbon atoms will be simply referred to as compound (A). In addition, at least one monohydric alcohol (B) selected from the group consisting of methanol, ethanol, and propanol will be simply referred to as monohydric alcohol (B).

[0033] Hereinafter, the components of the solid fuel of the present invention will be described. It should be noted that, unless otherwise specified, the mass ratio of each component in this specification is the mass ratio of 100% by mass of the solid fuel.

[0034] (Compound (A))

[0035] The above-mentioned polyalkylene glycol having 4 or fewer carbon atoms is represented by the following formula (1).

[0036] HO-(AO)m-H(1)

[0037] In formula (1), A, whether the same or different, represents an alkylene group having 4 or fewer carbon atoms. In other words, A independently represents methylene, ethylene, propylene, or butylene. A is preferably an alkylene group having 2 or more carbon atoms. In addition, A is preferably an alkylene group having 3 or fewer carbon atoms. A is more preferably ethylene or propylene, and even more preferably ethylene.

[0038] m is an integer of 3 or more, preferably 4 or more.

[0039] For m, from the viewpoint of making the solid fuel curing temperature appropriate, it is preferably 100 or less, more preferably 50 or less, even more preferably 30 or less, further preferably 20 or less, even more preferably 10 or less, and particularly preferably 6 or less.

[0040] The average molecular weight of the polyalkylene glycol having alkylene groups having 4 or fewer carbon atoms is preferably 200 or more. In addition, the average molecular weight is preferably 2000 or less, more preferably 1500 or less.

[0041] In this specification, the average molecular weight is the number-average molecular weight calculated based on the hydroxyl value (KOH mg / g).

[0042] The alkyl ether of the (poly)alkylene glycol having 4 or fewer carbon atoms can be a monoalkyl ether of the (poly)alkylene glycol or a dialkyl ether.

[0043] The alkyl ether of the (poly)alkylene glycol having 4 or fewer carbon atoms is represented by the following formula (2).

[0044] R2O-(R1O)n-R3 (2)

[0045] In formula (2), R1 can be the same or different, representing an alkylene with 4 or fewer carbon atoms. In other words, R1 independently represents methylene, ethylene, propylene, or butylene. R1 is preferably an alkylene with 2 or more carbon atoms. In addition, R1 is preferably an alkylene with 3 or fewer carbon atoms. R1 is more preferably ethylene or propylene, and even more preferably ethylene.

[0046] n is an integer of 1 or more.

[0047] n is preferably 100 or less, more preferably 10 or less, further preferably 3 or less, and even more preferably 2 or less. n is particularly preferably 1.

[0048] R2 represents a hydrogen atom or an alkyl group. The alkyl group has 1 or more carbon atoms. The number of carbon atoms is preferably 18 or less, more preferably 12 or less, and even more preferably 6 or less. The alkyl group is preferably, for example, methyl, ethyl, propyl, butyl, pentyl, or hexyl.

[0049] R3 represents an alkyl group. The alkyl group is the same as the alkyl group in R2.

[0050] The above-mentioned aryl ether of the (poly)alkylene glycol having 4 or fewer carbon atoms can be a monoaryl ether of the (poly)alkylene glycol or a diaryl ether.

[0051] The above-mentioned aryl ether of the (poly)alkylene glycol having 4 or fewer carbon atoms is represented by the following formula (3).

[0052] R5O-(R4O)n-R6(3)

[0053] In formula (3), R4 and n are the same as R1 and n in formula (2), respectively.

[0054] R5 represents a hydrogen atom or an aryl group. The number of carbon atoms in this aryl group is usually 4 or more, preferably 5 or more, more preferably 6 or more. The number of carbon atoms is preferably 18 or less, more preferably 12 or less, and even more preferably 8 or less. The aryl group is particularly preferably phenyl. Specification 3 / 13 page 5 CN 121203730 A

[0055] R6 represents an aryl group. This aryl group is the same as the aryl group in R5.

[0056] Of the above compound (A), preferably is a polyalkylene glycol having 4 or fewer carbon atoms, or an alkyl ether of a (poly)alkylene glycol having 4 or fewer carbon atoms; more preferably is a polyalkylene glycol having 4 or fewer carbon atoms, or an alkyl ether of a polyalkylene glycol having 4 or fewer carbon atoms; and even more preferably is a polyalkylene glycol having 4 or fewer carbon atoms.

[0057] In 100% by mass of the solid fuel of the present invention, the mass percentage of the above compound (A) is preferably 1% by mass or more.More preferably, it is 2% by mass or more. Furthermore, its mass percentage is preferably 50% by mass or less, more preferably 40% by mass or less, further preferably 35% by mass or less, and particularly preferably 30% by mass or less.

[0058] Here, the mass percentage of the above-mentioned compound (A) refers to the total mass percentage when the solid fuel contains two or more compounds (A). The same applies to the mass percentages of other components.

[0059] (Monohydrin (B))

[0060] The solid fuel of the present invention preferably contains at least one monohydric alcohol (B) selected from the group consisting of methanol, ethanol, and propanol.

[0061] The monohydric alcohol (B) is preferably methanol or ethanol, more preferably methanol.

[0062] It should be noted that propanol can be n-propanol or isopropanol.

[0063] The monohydric alcohol (B) is a component that functions as a combustion component; the higher the mass percentage in the solid fuel, the better the ignition performance and shape stability. On the other hand, from the viewpoint of improving the weight retention of solid fuel during storage, the mass ratio is preferably 95% by mass or less, more preferably 85% by mass or less, and even more preferably 70% by mass or less.

[0064] It should be noted that monohydric alcohol (B) can be used alone or in combination of two or more.

[0065] A mass ratio of 50 to 95% by mass of monohydric alcohol (B) (particularly preferably methanol) in 100% by mass of solid fuel is preferred in terms of excellent ignition performance. For example, from the viewpoint of ensuring sufficient ignition performance and improving the weight retention of solid fuel during storage, this mass ratio is more preferably 50% by mass or more and 70% by mass or less. This mass ratio is further preferably 55% by mass or more, more preferably 60% by mass or more, and particularly preferably 65% ​​by mass or more.

[0066] It should be noted that the preferred mass ratio range of monohydric alcohol (B) described above can be understood as the preferred mass ratio range of methanol.

[0067] In the solid fuel of the present invention, the mass ratio ((A) / (B)) of the above-mentioned compound (A) to the above-mentioned monohydric alcohol (B) (particularly preferably methanol) is preferably 0.01 or more, more preferably 0.02 or more. Furthermore, this mass ratio ((A) / (B)) is preferably 2 or less, more preferably 1 or less, and even more preferably 0.8 or less.

[0068] In 100% by mass of the solid fuel of the present invention, the total mass ratio of the above-mentioned compound (A) to the above-mentioned monohydric alcohol (B) (particularly preferably methanol) is preferably 40% by mass or more, more preferably 50% by mass or more, and even more preferably 60% by mass or more. Furthermore, this total mass ratio is preferably 98% by mass or less, more preferably 95% by mass or less, and even more preferably 93% by mass or less.

[0069] (Fatty acid (salt) (C))

[0070] The fatty acid (salt) (C) generally has 2 or more carbon atoms, preferably 8 or more. Furthermore, this carbon number is preferably 22 or less, more preferably...The number of carbon atoms is selected to be 20 or less.

[0071] It should be noted that in this specification, fatty acid (salt) (C) is fatty acid and / or fatty acid salt, preferably fatty acid salt. Fatty acid (salt) (C) is preferably a salt formed by the neutralization reaction of fatty acid with alkali. Fatty acid becomes fatty acid salt by the neutralization reaction with alkali, thereby exerting sufficient curing properties.

[0072] Fatty acid (salt) (C) can be used alone or in combination of two or more, preferably in combination of two or more. Specification 4 / 13 pages 6 CN 121203730 A For example, it is more preferable to use two or more fatty acid (salts) with different carbon numbers from fatty acid (salts) with 2 or more and 22 or less carbon atoms, and even more preferably to use two or more fatty acid (salts) with different carbon numbers from fatty acid (salts) with 8 or more and 20 or less carbon atoms.

[0073] The fatty acid (salt) (C) is not particularly limited. Examples include saturated fatty acids such as acetic acid, caprylic acid, octanoic acid, decanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, behenic acid, pentadecanoic acid, and heptadecanoic acid; and unsaturated fatty acids such as palmitoleic acid, oleic acid, linoleic acid, linolenic acid, and arachidonic acid. These can be used alone, but it is preferable to use two or more in combination. Among them, saturated fatty acids are preferred for the sake of stability of curing properties. In addition, fatty acids with 8 to 22 carbon atoms are also preferred. For example, at least one of the following groups is more preferred: caprylic acid, octanoic acid, decanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, arachidic acid, pentadecanoic acid, and heptadecanoic acid.

[0074] The salt (C) is not particularly limited. Examples include sodium salts and potassium salts. These can be used alone or in combination. From the perspective of stability of curing properties, sodium salts are preferred.

[0075] For example, the above-mentioned fatty acid (salt) (C) includes fatty acid (salt) (C-1) with 18 or more carbon atoms and fatty acid (salt) (C-2) with 17 or fewer carbon atoms. The mass ratio of (sodium fatty acid conversion value of (C-1)) / (sodium fatty acid conversion value of (C-2)) is preferably 0.1 or more and 10 or less.

[0076] It should be noted that, in this specification, the sodium fatty acid conversion value refers to the value (mass) of converting fatty acid (salt) into the same number of moles of sodium fatty acid.

[0077] The mass ratio of (sodium fatty acid conversion value of (C-1)) / (sodium fatty acid conversion value of (C-2)) is more preferably 0.2 or more. In addition, the mass ratio of (sodium fatty acid conversion value of (C-1)) / (sodium fatty acid conversion value of (C-2)) is more preferably 5 or less, and even more preferably 3 or less.

[0078] The above-mentioned fatty acid (salt) (C) includes fatty acid (salt) (C-1') with 18 to 22 carbon atoms and fatty acid with 2 to 17 carbon atoms.The mass ratio of (salt)(C-2'), (sodium fatty acid conversion value of (C-1')) / (sodium fatty acid conversion value of (C-2')) is more preferably 0.1 or more and 10 or less.

[0079] The preferred range of the mass ratio of (sodium fatty acid conversion value of (C-1')) / (sodium fatty acid conversion value of (C-2')) is the same as the preferred range of the mass ratio of (sodium fatty acid conversion value of (C-1)) / (sodium fatty acid conversion value of (C-2)).

[0080] The fatty acid (salt) (C) containing fatty acid (salt) (C) with 21 to 22 carbons (C-1A') is one of the preferred embodiments in the present invention. More preferably, it contains fatty acid (salt) (C-1B') with 18 to 20 carbons and fatty acid (salt) (C-1A') with 21 to 22 carbons. Furthermore, the mass ratio of ((C-1B') sodium fatty acid conversion value) / ((C-1A') sodium fatty acid conversion value) is further preferably 1 or more and 3 or less.

[0081] When the solid fuel of the present invention contains the above-mentioned fatty acid (salt) (C), the mass ratio of fatty acid (salt) (C) to sodium fatty acid is preferably 3 to 26% by mass of 100% of the solid fuel.

[0082] By making the mass ratio of fatty acid (salt) (C) to sodium fatty acid 26% or less, the solid fuel curing temperature can be further reduced. In addition, by making the mass ratio of fatty acid (salt) (C) to sodium fatty acid 3% or more, there is a tendency to obtain more sufficient curability and a better shape of the solid fuel during combustion.

[0083] The mass ratio of fatty acid (salt) (C) to sodium fatty acid is preferably 22% or less, more preferably 20% or less, further preferably 16% or less, more preferably 14% or less, and particularly preferably 13% or less. Instruction manual, page 5 / 13, CN 121203730 A

[0084] The above-mentioned solid fuel may also contain polyols. Polyols function as auxiliary components (auxiliary combustion components) of monohydric alcohols (B). In this specification, polyols refer to alcohols with two or more components, and are not high molecular weight alcohols (e.g., alcohols with a molecular weight of 300 or less).

[0085] Polyols are preferably at least one selected from the group consisting of ethylene glycol, diethylene glycol, propylene glycol, and glycerol.

[0086] Polyols may be used alone or in combination of two or more.

[0087] For polyols, ethylene glycol and / or diethylene glycol are preferred from the perspective of ignition performance and maintenance of the shape of the solid fuel during combustion, and ethylene glycol is more preferred from the perspective of reducing odor during combustion.

[0088] For the mass ratio of polyols in 100% by mass of solid fuel, from the viewpoint of making ignition performance better,Preferably, the mass percentage is 40% or less, more preferably 30% or less, and even more preferably 20% or less. The mass percentage of the polyol may also be 0%.

[0089] In addition, the solid fuel of the present invention comprising a monohydric alcohol (B) (particularly preferably methanol) and a polyol is also one of the preferred embodiments of the present invention.

[0090] The mass percentage of alcohol in 100% by mass of the solid fuel is preferably 50 to 99% by mass. It should be noted that the alcohol is at least one selected from the group consisting of monohydric alcohols other than monohydric alcohols (B) and polyols.

[0091] The mass percentage of the above-mentioned alcohol is more preferably 60% or more by mass, and even more preferably 65% ​​or more by mass.

[0092] The mass percentage of the above-mentioned alcohol is more preferably 90% or less by mass, and even more preferably 80% or less by mass.

[0093] The above-mentioned solid fuel may contain a thickener. As a result, the dispersion of particulate matter during combustion can be suppressed, and there is a tendency to further improve the stability of the solidification.

[0094] The thickener may be used alone or in combination of two or more types.

[0095] There are no particular limitations on the thickener, and examples include polysaccharides, polyacrylamide, polyacrylic acid and its salts, polyvinyl alcohol, etc. Among them, polysaccharides are preferred from the perspective of suppressing the dispersion of particulate fuel during combustion. That is, it is preferred that the aforementioned thickener includes polysaccharides.

[0096] There are no particular limitations on the polysaccharide, and examples include cellulose derivatives, starch, alginate and its salts (e.g., sodium alginate), guar gum, gellan gum, gelatin, pectin, xanthan gum, carrageenan, etc.

[0097] The mass ratio of the thickener in 100% by mass of the above-mentioned solid fuel is preferably 1.0% by mass or less, more preferably 0.8% by mass or less, and even more preferably 0.5% by mass or less. The mass ratio of the thickener may also be 0% by mass.

[0098] It should be noted that substances belonging to the above-mentioned compounds (A), monohydric alcohols (B), and fatty acid (salt) (C) are not included in the mass ratio of the thickener.

[0099] In addition to the above-mentioned components, the solid fuel may also contain additives commonly used in solid fuels. Examples of additives include flavorings, color powders, and stabilizers. These additives may be used individually or in combination of two or more. Furthermore, when preparing the solid fuel, a neutralizing agent such as sodium hydroxide may be used to neutralize the fatty acids.

[0100] The solid fuel preferably contains water.

[0101] When the solid fuel contains water, the mass percentage of water in 100% by mass of the solid fuel is preferably 0.1% by mass or more, more preferably 0.2% by mass or more, and even more preferably 0.3% by mass or more. The mass percentage of water is preferably 40% by mass or less, more preferably 35% by mass or less, even more preferably 30% by mass or less, and particularly preferably 25% by mass.The following should be noted. It should be noted that when the mass ratio of water is 30% or less, the ignition performance is better, and there is also a tendency for better curing performance. The above-mentioned mass ratio of water also includes the water content generated by neutralization with acidic agents such as alkali and fatty acids. Specification 6 / 13 pages 8 CN 121203730 A

[0102] The aforementioned solid fuel can be manufactured by conventional methods. That is, it can be manufactured by mixing and neutralizing the aforementioned components while heating in a mixing tank, and then cooling and curing them.

[0103] When the aforementioned solid fuel contains alcohol, in order to make the alcohol, which is liquid, into a solid, fatty acids and alkali can be mixed in the solid fuel composition. The fatty acids become fatty acid salts by neutralization reaction with the alkali, thereby obtaining sufficient curing performance, and the solid fuel composition is made into a solid fuel as a solid. It should be noted that the solid fuel in block or tall cylindrical shape can also be shaped into a specified shape (low cylindrical shape, etc.) by cutting or the like.

[0104] The surface of the aforementioned solid fuel can be covered with paraffin wax. For example, the aforementioned solid fuel can also be sealed with paraffin wax. If the surface of the solid fuel is covered with paraffin wax, the evaporation of the fuel components of the solid fuel can be prevented, and there is a tendency to obtain better weight retention. In addition, it has the ignition properties necessary for fuel and can prevent accidental ignition of solid fuel, and there is a tendency to become a solid fuel with greater emphasis on safety. In addition, there is a tendency for the shape of solid fuel during combustion to be more superior.

[0105] As for paraffin wax, there is no particular limitation as long as it is a hydrocarbon, for example, chain saturated hydrocarbons such as hexadecane, heptadecane, octadecane, nonadecane, eicosane, dodecane, tridecane, tetradecane, pentadecane, hexadecane, heptadecane, octadecane, and nonadecane can be cited. These can be used alone or in combination of two or more.

[0106] There is no particular limitation on the method of covering the surface of solid fuel with paraffin wax, for example, it can be done by spraying liquid paraffin wax onto the surface of solid fuel, or by immersing the surface of solid fuel in heated and melted liquid paraffin wax.

[0107] The shape of the aforementioned solid fuel is not particularly limited. For example, cylindrical, prismatic, block, and powder shapes are possible. However, from the perspective of ignition stability, cylindrical and prismatic shapes are preferred.

[0108] The aforementioned solid fuel may be packaged in outer packaging materials such as aluminum foil, or it may be unpackaged. From the perspective of maintaining its shape during combustion, unpackaged solid fuel is preferred.

[0109] It should be noted that the aforementioned solid fuel may be filled into a can. For example, it is also possible to assume that the can is filled with solid fuel, and the lid is opened and the solid fuel is ignited while the can is in place, thus serving as a product for fuel use.

[0110] The aforementioned solid fuel can be used for heat preservation, heating, and cooking of cooked food. It is preferably used for heat preservation and heating of cooked food.

[0111] The weight of the aforementioned solid fuel is not particularly limited and can be appropriately set according to the intended use. If used for heat preservation and heating of cooked food, it is preferably 3-300g, more preferably 3-60g, and even more preferably 5-50g.

[0112] It should be noted that in this specification, when the solid fuel is packaged in outer packaging material or the surface of the solid fuel is covered with paraffin wax, the weight (mass) of the outer packaging material and the weight (mass) of the paraffin wax are not included in the weight (mass) of the solid fuel.

[0113] When the aforementioned solid fuel is burned, the solid fuel is placed inside a tray and ignited to burn. Solid fuel of this shape is suitable for heat preservation, for example, of hot pot dishes that have already been cooked.

[0114] Examples

[0115] The present invention will be specifically described based on examples, but the present invention is not limited to these.

[0116] Hereinafter, the various chemicals used in the examples and comparative examples are summarized and described.

[0117] Methanol: Methanol manufactured by Yoneyama Pharmaceutical Co., Ltd.

[0118] Ethanol: Ethanol (99.5%) manufactured by Yoneyama Pharmaceutical Co., Ltd.

[0119] Isopropanol: 2-propanol manufactured by Yoneyama Pharmaceutical Co., Ltd.

[0120] Ethylene glycol: Ethylene glycol manufactured by Yoneyama Pharmaceutical Co., Ltd. (Instruction manual page 7 / 13, 9 CN 121203730 A)

[0121] Sodium stearate: Stearic acid manufactured by Tokyo Chemical Industry Co., Ltd. is obtained by neutralizing it with liquid caustic soda (48%) manufactured by AGC Co., Ltd.

[0122] Sodium palmitate: Palmitic acid manufactured by Tokyo Chemical Industry Co., Ltd. is obtained by neutralizing it with liquid caustic soda (48%) manufactured by AGC Co., Ltd.

[0123] Sodium octanoate: Prepared by neutralizing 2-ethylhexanoic acid manufactured by Tokyo Chemical Industry Co., Ltd. with liquid caustic soda (48%) manufactured by AGC Co., Ltd.

[0124] Sodium laurate: Prepared by neutralizing lauric acid manufactured by Tokyo Chemical Industry Co., Ltd. with liquid caustic soda (48%) manufactured by AGC Co., Ltd.

[0125] Sodium behenate: Prepared by neutralizing behenate manufactured by Tokyo Chemical Industry Co., Ltd. with liquid caustic soda (48%) manufactured by AGC Co., Ltd.

[0126] Sodium acetate: Prepared by neutralizing acetic acid manufactured by Tokyo Chemical Industry Co., Ltd. with liquid caustic soda (48%) manufactured by AGC Co., Ltd.

[0127] Diethylene glycol monobutyl ether: Bucisenol 20P manufactured by KH NEOCHEM CO.,LTD.

[0128] Propylene glycol methyl ether: DOWANOL PM

[0129] manufactured by Dow Chemical Company3-Methoxy-3-methyl-1-butanol: Solfit manufactured by Kuraray Co., Ltd.

[0130] Ethylene glycol methyl ether: manufactured by Nippon Emulsifier Co., Ltd.

[0131] Ethylene glycol monoisobutyl ether: manufactured by Nippon Emulsifier Co., Ltd.

[0132] Ethylene glycol hexyl ether: manufactured by Nippon Emulsifier Co., Ltd.

[0133] Ethylene glycol monophenyl ether: manufactured by Nippon Emulsifier Co., Ltd.

[0134] Diethylene glycol monophenyl ether: manufactured by Nippon Emulsifier Co., Ltd.

[0135] Diethylene glycol dimethyl ether: manufactured by Nippon Emulsifier Co., Ltd.

[0136] PEG200: polyethylene glycol with an average molecular weight of 200 manufactured by Nippon Oil Co., Ltd.

[0137] PEG300: polyethylene glycol with an average molecular weight of 300 manufactured by Nippon Oil Co., Ltd.

[0138] PEG400: Polyethylene glycol manufactured by Nippon Oil Co., Ltd., with an average molecular weight of 400

[0139] PPG250: Polypropylene glycol manufactured by Nippon Oil Co., Ltd., with an average molecular weight of 250

[0140] PPG400: Polypropylene glycol manufactured by Nippon Oil Co., Ltd., with an average molecular weight of 400

[0141] PPG700: Polypropylene glycol manufactured by Nippon Oil Co., Ltd., with an average molecular weight of 700

[0142] PBG500: Polybutane glycol manufactured by Nippon Oil Co., Ltd., with an average molecular weight of 500

[0143] PBG700: Polybutane glycol manufactured by Nippon Oil Co., Ltd., with an average molecular weight of 700

[0144] PEG-PPG-PEG (average molecular weight 1100): Manufactured by Nippon Oil Co., Ltd.

[0145] PEG-PPG-PEG (average molecular weight 1300): Manufactured by Nippon Oil Co., Ltd.

[0146] (Examples and Comparative Examples)

[0147] <Preparation of Solid Fuel>

[0148] According to the formulations shown in Tables 1 to 4, each chemical was mixed at 55 to 70°C using a heated stirrer to obtain a solid fuel composition. Here, in each formulation, fatty acids and sodium hydroxide were mixed in such a way that fatty acid salts were the composition shown in Tables 1 to 4. The mass (parts by mass) of each component is the mass of the pure component. In addition, the total amount is 100 parts by mass.

[0149] After the obtained solid fuel composition was cooled and solidified, it was cut into a cylindrical shape to obtain solid fuel.

[0150] The obtained solid fuel was evaluated as follows, and the results are shown in Tables 1 to 4. Specification 8 / 13 pages 10 CN 121203730 A

[0151] (Gel point (curing temperature))

[0152] The gel point is the temperature at which the mixture is cooled and solidified after heating. From the viewpoint that no solidification occurs during heating and mixing, it is ideal to be low. The decimal point is rounded.

[0153] Evaluation was conducted according to the following criteria.

[0154] ◎: Below 59℃

[0155] 〇: 60℃~63℃

[0156] △: 64℃~66℃

[0157] ×: Above 67℃

[0158] It should be noted that if the value is △ or higher, it is considered good.

[0159] (Ignition property)

[0160] The upper surface of the solid fuel is brought into contact with the flame of the igniter, and the time required until ignition is measured. Evaluation is performed according to the following criteria.

[0161] 0: Ignition time is less than 1 second

[0162] △: Ignition time is more than 1 second but less than 2 seconds

[0163] ×: It does not ignite even after contact with the flame for 2 seconds

[0164] It should be noted that if the value is △ or higher, it is considered good.

[0165] (Prevention of dissolution during combustion)

[0166] After the solid fuel is ignited and solidified, the combustion state in which the weight decreases by 10% is observed by visual inspection. Evaluation is performed according to the following criteria.

[0167] ◎: Burns with complete shape preservation

[0168] 〇: Less than 20% shape damage

[0169] △: More than 20% and less than 50% shape damage

[0170] ×: More than 50% shape damage

[0171] It should be noted that if it is △ or above, it is considered good.

[0172] [Table 1] Specification 9 / 13 pages 11 CN 121203730 A

[0173]

[0174] [Table 2] Specification 10 / 13 pages 12 CN 121203730 A

[0175]

[0176] [Table 3] Specification 11 / 13 pages 13 CN 121203730 A

[0177]

[0178] [Table 4] Specification 12 / 13 pages 14 CN 121203730 A

[0179]

[0180] As can be seen from Tables 1 to 4, the solid fuel containing the specified compound (A) can be properly prepared without solidification when heated and mixed, and can maintain its shape sufficiently during combustion. Specification 13 / 13 Page 15 CN 121203730 A Abstract The present invention is a solid fuel. The present invention provides a solid fuel which can be properly prepared without solidification when heating and mixing, and which can sufficiently maintain its shape when combusting. A solid fuel is characterized by comprising at least one compound (A) selected from the groupconsisting of a polyalkylene glycol having an alkylene group of 4 or less carbon atoms, an alkyl ether of a (poly) alkylene glycol having an alkylene group of 4 or less carbon atoms, and an aryl ether of a (poly) alkylene glycol having an alkylene group of 4 or less carbon atoms.

Claims

1. A solid fuel, characterized in that, The compound (A) comprises at least one compound selected from the group consisting of polyalkylene glycols having 4 or fewer carbon atoms, alkyl ethers of (poly)alkylene glycols having 4 or fewer carbon atoms, and aryl ethers of (poly)alkylene glycols having 4 or fewer carbon atoms.

2. The solid fuel according to claim 1, wherein, The mass ratio of compound (A) is 1 to 25% by mass.

3. The solid fuel according to claim 1 or 2, comprising at least one monohydric alcohol (B) selected from the group consisting of methanol, ethanol and propanol.

4. The solid fuel according to claim 3, wherein, The mass percentage of the monohydric alcohol (B) is less than 70% by mass.

5. The solid fuel according to claim 1 or 2, comprising fatty acid (salt) (C).

6. The solid fuel according to claim 5, wherein, The mass ratio of the fatty acid (salt) (C) to sodium fatty acid is 3-26 by mass.

7. The solid fuel according to claim 1 or 2, comprising water.

8. The solid fuel according to claim 7, wherein, The water has a mass ratio of 1 to 35%.